1. A sampling system for simulating open-air combustion of biomass is characterized by comprising a closed simulation cabin and a flue gas circulating system;

the slideway sample placing device, the PM sampler, the combustion condition and product monitoring device, the air turbine device, the flue gas extraction device and the spraying module are arranged in the simulation cabin;

the slideway sample placing device, the PM sampler and the combustion condition and product monitoring device are adjacently placed;

the combustion condition and product monitoring device comprises a temperature detection sensor, a humidity detection sensor and a gaseous pollutant detection device;

an ignition device is also arranged in the simulation cabin;

the ignition device is arranged around the slide sample placing device in an adjacent mode;

the air inlet of the smoke gas pumping device is arranged at the top in the simulation cabin;

the air turbine device is arranged at the upper part in the simulation cabin;

the gas outlet of the flue gas pumping device is respectively communicated with the gas inlet of the flue gas circulating system and the outside of the system;

the number of the air outlets of the smoke circulating system is more than one.

2. The sampling system of claim 1, wherein the simulation chamber is provided with an air outlet on a plane;

the number of the air outlets is 3-6;

an adjusting device is arranged between the air outlet of the flue gas pumping device and the air inlet of the flue gas circulating system;

the plurality of air outlets are respectively provided with an adjusting device;

the smoke gas pumping device is associated with the smoke gas circulating system to realize interlocking control.

3. The sampling system of claim 1, wherein the temperature detection sensor, the humidity detection sensor and the spray module are associated to realize interlocking control;

the number of the spraying modules is 1-4;

and a spraying module is arranged on the plane of the simulation cabin.

4. The sampling system of claim 1, wherein the flue gas recirculation system is associated with the air turbine arrangement for coordinated control;

the sampling system further comprises a computer control system;

the fume circulating system, the combustion condition and product monitoring device, the air turbine device, the fume extraction device and more than one device in the spraying module are associated with the computer control system to realize interlocking control;

the slide sample placing device is a rectangular slide.

5. The sampling system of claim 1, wherein the simulation chamber is further provided with a closed manual operation device;

the setting position of the closed manual operation device is related to the position of the slide sample placing device;

the closed manual control operation device is provided with rubber gloves for placing and igniting biomass;

the PM sampler comprises PM_2.5Sampler and/or PM₁A sampler.

6. The sampling system of claim 1, wherein the slide sample placement device is further provided with an asbestos cloth;

the gaseous pollutants comprise SO₂、NO_x、CO、O₃And NH₃One or more of;

the simulation cabin comprises organic glass;

the volume of the simulation cabin is 0.5-1 m³；

The placing amount of the slide way sample placing device is 5-20 g.

7. A sampling method for simulating open-air combustion of biomass by using the sampling system as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:

1) carrying out ventilation treatment on the simulation cabin through a ventilation device, setting the sampling time of a PM sampler, the combustion condition and the sampling parameters of a product monitoring device at the same time until the state in the simulation cabin is constant, and then keeping the simulation cabin closed;

2) the dried biomass raw material is sent into a simulation cabin through a slideway sample placing device, and then the biomass raw material is ignited through a closed manual control operation device;

3) in the combustion process of the biomass raw material, an air turbine device in a simulation cabin is started, so that after combustion flue gas is uniformly dispersed, a PM sampler, a combustion condition and product monitoring device are started for sampling;

or in the combustion process of the biomass raw material, starting an air turbine device, a flue gas exhaust device, a flue gas circulating system, a spraying module and a computer control system in the simulation cabin to simulate the atmospheric state and the weather condition, and then starting a PM sampler, a combustion condition and a product monitoring device to sample.

8. The sampling method of claim 7, wherein the conditions within the simulation chamber are constant comprising temperature and humidity within the simulation chamber are constant;

the drying temperature is 105-120 ℃;

the drying is specifically drying for multiple times until the weight is constant;

the biomass raw material comprises one or more of peanut shells, rice hulls, wheat straws and wood particles.

Background

With the increasing exhaustion of fossil resources and the strong support of the whole society for energy capable of being circularly developed, in recent years, the technology of biomass energy has received wide attention of various scholars. The biomass energy recycling technology is an effective means for converting biomass into liquid, solid and gas products and realizing efficient utilization of the biomass, and is also one of the most applied biomass. The biomass fuel is fuel produced by burning biomass material, mainly agricultural and forestry waste (such as straw, sawdust, bagasse and rice chaff), and is mainly different from fossil fuel. In the current national policy and environmental standard, direct combustion of biomass is a highly polluting fuel and is therefore to be avoided as much as possible. In the application of biomass fuel, Biomass Molded Fuel (BMF) is a novel clean fuel which is prepared by using agricultural and forestry wastes as raw materials and performing processes such as crushing, mixing, extruding, drying and the like to form various shapes (such as blocks, particles and the like) and can be directly combusted.

The biomass will release PM in the combustion process_2.5Air pollutants such as CO and VOCs have certain influence on regional environment quality, atmospheric visibility, human health and climate change. In recent years, different scholars conduct research of different scales aiming at open-air combustion of biomass, China is used as a global agricultural big country, a large amount of straws, peanut shells, rice husks and the like are generated in the process of planting grains, open-air incineration and indoor fuel consumption of the device are main forms of biomass combustion in China, particularly, northeast China is used as a main grain producing area in China, a large amount of biomass is generated in the process of agricultural production, the device is located in northern cold areas, the plant growth period is short, open-air incineration is the most efficient way for cleaning the land, and the combustion emission characteristics of different biomass types are different. At present, the collection of particulate matter samples in the biomass combustion process is carried out in the actual combustion process or a laboratory, but the collection of samples in the actual open-air incineration process is often influenced by atmospheric environments with different degrees, and open-air combustion emission factors in the collected samples cannot be distinguished(ii) a And the simulation combustion in the laboratory is also mostly carried out in a naked place and is difficult to avoid the influence of the environment.

Therefore, finding a suitable way to simulate the open-air incineration of biomass and perform more accurate collection and monitoring has become one of the focuses of great concern to many researchers in the field.

Disclosure of Invention

In view of the above, the technical problem to be solved by the present invention is to provide a sampling system for simulating open-air combustion of biomass and a sampling method for simulating open-air combustion of biomass, and in particular, to a sampling system for simulating open-air combustion of biomass.

The invention provides a sampling system for simulating open-air combustion of biomass, which is characterized by comprising a closed simulation cabin and a flue gas circulating system;

the slideway sample placing device, the PM sampler, the combustion condition and product monitoring device, the air turbine device, the flue gas extraction device and the spraying module are arranged in the simulation cabin;

the slideway sample placing device, the PM sampler and the combustion condition and product monitoring device are adjacently placed;

the combustion condition and product monitoring device comprises a temperature detection sensor, a humidity detection sensor and a gaseous pollutant detection device;

an ignition device is also arranged in the simulation cabin;

the ignition device is arranged around the slide sample placing device in an adjacent mode;

the air inlet of the smoke gas pumping device is arranged at the top in the simulation cabin;

the air turbine device is arranged at the upper part in the simulation cabin;

the gas outlet of the flue gas pumping device is respectively communicated with the gas inlet of the flue gas circulating system and the outside of the system;

the number of the air outlets of the smoke circulating system is more than one.

An air outlet is formed in the plane of the simulation cabin;

the number of the air outlets is 3-6;

an adjusting device is arranged between the air outlet of the flue gas pumping device and the air inlet of the flue gas circulating system;

the plurality of air outlets are respectively provided with an adjusting device;

the smoke gas pumping device is associated with the smoke gas circulating system to realize interlocking control.

The temperature detection sensor, the humidity detection sensor and the spraying module are associated to realize linkage control;

the number of the spraying modules is 1-4;

and a spraying module is arranged on the plane of the simulation cabin.

The flue gas circulating system is associated with the air turbine device to realize interlocking control;

the sampling system further comprises a computer control system;

the fume circulating system, the combustion condition and product monitoring device, the air turbine device, the fume extraction device and more than one device in the spraying module are associated with the computer control system to realize interlocking control;

the slide sample placing device is a rectangular slide.

The simulation cabin is also provided with a closed manual operation device;

the setting position of the closed manual operation device is related to the position of the slide sample placing device;

the closed manual control operation device is provided with rubber gloves for placing and igniting biomass;

the PM sampler comprises PM_2.5Sampler and/or PM₁A sampler.

The slideway sample placing device is also provided with an asbestos net;

the gaseous pollutants comprise SO₂、NO_x、CO、O₃And NH₃One or more of;

the simulation cabin comprises organic glass;

the volume of the simulation cabin is 0.5-1 m³；

The placing amount of the slide way sample placing device is 5-20 g.

The invention provides a sampling method for simulating open-air combustion of biomass by using the sampling system in any one of the technical schemes, which comprises the following steps:

1) carrying out ventilation treatment on the simulation cabin through a ventilation device, setting the sampling time of a PM sampler, the combustion condition and the sampling parameters of a product monitoring device at the same time until the state in the simulation cabin is constant, and then keeping the simulation cabin closed;

2) the dried biomass raw material is sent into a simulation cabin through a slideway sample placing device, and then the biomass raw material is ignited through a closed manual control operation device;

3) in the combustion process of the biomass raw material, an air turbine device in a simulation cabin is started, so that after combustion flue gas is uniformly dispersed, a PM sampler, a combustion condition and product monitoring device are started for sampling;

or in the combustion process of the biomass raw material, starting an air turbine device, a flue gas exhaust device, a flue gas circulating system, a spraying module and a computer control system in the simulation cabin to simulate the atmospheric state and the weather condition, and then starting a PM sampler, a combustion condition and a product monitoring device to sample.

The constant state in the simulation cabin comprises constant temperature and humidity in the simulation cabin;

the drying temperature is 105-120 ℃;

the drying is specifically drying for multiple times until the weight is constant;

the biomass raw material comprises one or more of peanut shells, rice hulls, wheat straws and wood particles.

The invention provides a sampling system for simulating open-air combustion of biomass, which comprises a closed simulation cabin and a flue gas circulating system, wherein the closed simulation cabin is provided with a gas inlet and a gas outlet; the slideway sample placing device, the PM sampler, the combustion condition and product monitoring device, the air turbine device, the flue gas extraction device and the spraying module are arranged in the simulation cabin; the slide sample placement device, the PM sampler and the combustion condition and product monitoring device are adjacently placed. Compared with the prior art, the method aims at the problems that the collection of information such as particle samples and the like in the existing biomass combustion process is influenced by the atmospheric environment to different degrees, and open-air combustion emission factors in the collected samples cannot be distinguished; and the simulation combustion in the laboratory is also mostly carried out in a naked place, so that the problem of influence of the environment is difficult to avoid.

The invention particularly provides a sampling system for simulating open-air combustion of biomass. This burning sampling system that simulation living beings were burned in open air and were discharged has adopted special device and combination, mainly comprises material feeding unit, burner, sample collection device, smoke exhaust (take a breath) device and monitoring devices, can simulate, sample, monitor and data collection to the process of living beings open air burning under inclosed condition to obtain the more accurate data of living beings open air burning process. The system can simulate outdoor biomass combustion and simultaneously collect products after biomass combustion and PM generated in the biomass combustion process_2.5And PM₁The device and the method monitor the change characteristics of the gaseous pollutants and the like, and overcome the defects that the biomass combustion process cannot be simulated under a closed condition in the conventional research process, and the collected samples are greatly influenced by the external environment in the open-air combustion process. More importantly, the invention can also utilize a flue circulating pipeline system, an internal controllable adjusting valve and a plurality of channels to match with an air turbine device and a flue gas pumping device to jointly simulate an atmosphere circulating system (such as calm and steady weather in strong wind weather, breeze weather, warm flow, cold air and the like) by matching and controlling various devices, and in addition, the invention can be used for controlling the humidity in the box and simulating the straw combustion in high-humidity air environments such as rainy day, strong fog weather, haze weather and the like by matching a temperature detection sensor and a humidity detection sensor with a spraying moduleAnd the open air environment combustion is fitted, and the difference is further analyzed. The system and the method provided by the invention are simple and easy to implement, good in controllability and low in cost, and are more beneficial to industrial popularization and application.

Experimental results show that the environment simulation cabin provided by the invention can better judge the pollution source and analyze the biomass combustion products and the influence of the biomass combustion products on the atmospheric environment compared with the existing outdoor measurement when biomass simulation combustion is carried out.

Drawings

FIG. 1 is a schematic diagram of a sampling system for simulating open-air combustion of biomass according to the present invention;

FIG. 2 shows the mass concentration analysis (10.19-10.22) of the PM2.5 in the atmosphere at the beginning of the heating period in the straw burning period.

Detailed Description

For a further understanding of the invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate the features and advantages of the invention and are not intended to limit the invention to the claims.

All of the starting materials of the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.

All the raw materials of the present invention are not particularly limited in purity, and the present invention preferably employs analytical purification or purity which is conventional in the field of biomass combustion.

A sampling system for simulating open-air combustion of biomass is characterized by comprising a closed simulation cabin and a flue gas circulating system;

the slideway sample placing device, the PM sampler, the combustion condition and product monitoring device, the air turbine device, the flue gas extraction device and the spraying module are arranged in the simulation cabin;

the slideway sample placing device, the PM sampler and the combustion condition and product monitoring device are adjacently placed;

the combustion condition and product monitoring device comprises a temperature detection sensor, a humidity detection sensor and a gaseous pollutant detection device;

an ignition device is also arranged in the simulation cabin;

the ignition device is arranged around the slide sample placing device in an adjacent mode;

the air inlet of the smoke gas pumping device is arranged at the top in the simulation cabin;

the air turbine device is arranged at the upper part in the simulation cabin;

the gas outlet of the flue gas pumping device is respectively communicated with the gas inlet of the flue gas circulating system and the outside of the system;

the number of the air outlets of the smoke circulating system is more than one.

An air outlet is formed in the plane of the simulation cabin;

the number of the air outlets is 3-6;

an adjusting device is arranged between the air outlet of the flue gas pumping device and the air inlet of the flue gas circulating system;

the plurality of air outlets are respectively provided with an adjusting device;

the smoke gas pumping device is associated with the smoke gas circulating system to realize interlocking control.

The temperature detection sensor, the humidity detection sensor and the spraying module are associated to realize linkage control;

the number of the spraying modules is 1-4;

and a spraying module is arranged on the plane of the simulation cabin.

The flue gas circulating system is associated with the air turbine device to realize interlocking control;

the sampling system further comprises a computer control system;

the fume circulating system, the combustion condition and product monitoring device, the air turbine device, the fume extraction device and more than one device in the spraying module are associated with the computer control system to realize interlocking control;

the slide sample placing device is a rectangular slide.

The simulation cabin is also provided with a closed manual operation device;

the setting position of the closed manual operation device is related to the position of the slide sample placing device;

the closed manual control operation device is provided with rubber gloves for placing and igniting biomass;

the PM sampler comprises PM_2.5Sampler and/or PM₁A sampler.

The slideway sample placing device is also provided with an asbestos net;

the gaseous pollutants comprise SO₂、NO_x、CO、O₃And NH₃One or more of;

the simulation cabin comprises organic glass;

the volume of the simulation cabin is 0.5-1 m³；

The placing amount of the slide way sample placing device is 5-20 g.

The invention provides a sampling method for simulating open-air combustion of biomass by using the sampling system in any one of the technical schemes, which comprises the following steps:

1) carrying out ventilation treatment on the simulation cabin through a ventilation device, setting the sampling time of a PM sampler, the combustion condition and the sampling parameters of a product monitoring device at the same time until the state in the simulation cabin is constant, and then keeping the simulation cabin closed;

2) the dried biomass raw material is sent into a simulation cabin through a slideway sample placing device, and then the biomass raw material is ignited through a closed manual control operation device;

3) in the combustion process of the biomass raw material, an air turbine device in a simulation cabin is started, so that after combustion flue gas is uniformly dispersed, a PM sampler, a combustion condition and product monitoring device are started for sampling;

or in the combustion process of the biomass raw material, starting an air turbine device, a flue gas exhaust device, a flue gas circulating system, a spraying module and a computer control system in the simulation cabin to simulate the atmospheric state and the weather condition, and then starting a PM sampler, a combustion condition and a product monitoring device to sample.

The constant state in the simulation cabin comprises constant temperature and humidity in the simulation cabin;

the drying temperature is 105-120 ℃;

the drying is specifically drying for multiple times until the weight is constant;

the biomass raw material comprises one or more of peanut shells, rice hulls, wheat straws and wood particles.

The invention provides a sampling system for simulating open-air combustion of biomass, which comprises a closed simulation cabin and a flue gas circulating system, wherein the closed simulation cabin is provided with a gas inlet and a gas outlet;

the slideway sample placing device, the PM sampler, the combustion condition and product monitoring device, the air turbine device, the flue gas extraction device and the spraying module are arranged in the simulation cabin;

the slide sample placement device, the PM sampler and the combustion condition and product monitoring device are adjacently placed.

The sampling system for simulating open-air combustion of biomass comprises a closed simulation cabin.

The invention has no special limitation on the material of the closed simulation cabin in principle, and a person skilled in the art can select and adjust the closed simulation cabin according to the actual production condition, the combustion requirement and the energy supply requirement.

The size of the closed simulation cabin is not particularly limited in principle, and can be selected and adjusted by a person skilled in the art according to actual production conditions, combustion requirements and energy supply requirements, the simulation cabin is used for better simulating, sampling, monitoring and data collecting the open-air combustion process of biomass under a closed condition, monitoring the change characteristics of gaseous pollutants and obtaining more accurate data, and the size of the simulation cabin is preferably 0.5-1 m³More preferably 0.6 to 0.9m³More preferably 0.7 to 0.8m³Specifically, it may be 1m³。

The sampling system for simulating open-air combustion of biomass comprises a slide way sample placing device, wherein the slide way sample placing device is arranged in the simulation cabin.

The invention is not particularly limited in principle to the shape of the slide sample placement device, and can be selected and adjusted by a person skilled in the art according to actual production conditions, combustion requirements and energy supply requirements.

The placing amount of the slide way sample placing device is not particularly limited in principle, and can be selected and adjusted by a person skilled in the art according to actual production conditions, combustion requirements and energy supply requirements, the slide way sample placing device is used for better simulating, sampling, monitoring and data collecting the open-air combustion process of biomass under a closed condition, monitoring the change characteristics of gaseous pollutants and obtaining more accurate data, and the placing amount of the slide way sample placing device is preferably 5-20 g, more preferably 7-18 g, more preferably 10-15 g, and particularly can be 5 g.

The invention is a complete and detailed integral preparation process, better performs simulation, sampling, monitoring and data collection on the open-air combustion process of biomass under a closed condition, monitors the change characteristics of gaseous pollutants to obtain more accurate data, and the simulation cabin is also internally provided with an ignition device. Preferably, the slide sample placing device is also preferably provided with an asbestos net.

The invention is a complete and detailed integral preparation process, better performs simulation, sampling, monitoring and data collection on the open-air combustion process of biomass under a closed condition, monitors the change characteristics of gaseous pollutants to obtain more accurate data, and the simulation cabin is also internally provided with an ignition device. Preferably, the ignition device is disposed adjacent to and around the slide sample placement device.

The invention is a complete and detailed integral preparation process, better performs simulation, sampling, monitoring and data collection on the open-air combustion process of biomass under a closed condition, monitors the change characteristics of gaseous pollutants to obtain more accurate data, and the simulation cabin is also preferably provided with a closed manual operation device.

The invention is a complete and detailed integral preparation process, better performs simulation, sampling, monitoring and data collection on the open-air combustion process of biomass under a closed condition, monitors the change characteristics of gaseous pollutants and obtains more accurate data, and the setting position of the closed manual operation device is preferably related to the position of the slide sample placing device.

The invention is not particularly limited to the placing objects on the closed manual operation device in principle, and can be selected and adjusted by a person skilled in the art according to the actual production condition, the combustion requirement and the energy supply requirement.

The sampling system for simulating open-air combustion of biomass comprises an air turbine device, wherein the air turbine device is arranged at the upper part in a simulation cabin.

The invention is not limited in particular to the specific selection of the PM sampler, and can be selected and adjusted by a person skilled in the art according to the actual production condition, the combustion requirement and the energy supply requirement, and the invention is better to simulate, sample, monitor and collect data of the open-air combustion process of the biomass under the closed condition, monitor the change characteristics of the gaseous pollutants and obtain more accurate data, and the PM sampler preferably comprises the PM_2.5Sampler and/or PM₁Sampler, more preferably PM_2.5Sampler and PM₁A sampler.

The invention is a complete and detailed integral preparation process, better performs simulation, sampling, monitoring and data collection on the open-air combustion process of biomass under a closed condition, monitors the change characteristics of gaseous pollutants to obtain more accurate data, and the sampling system also preferably comprises a flue gas exhaust device.

The invention is a complete and detailed integral preparation process, better performs simulation, sampling, monitoring and data collection on the open-air combustion process of biomass under a closed condition, monitors the change characteristics of gaseous pollutants to obtain more accurate data, and the air inlet of the flue gas exhaust device is preferably arranged at the top in the simulation cabin.

The invention is not limited in particular to the specific selection of the combustion condition and product monitoring device in principle, and can be selected and adjusted by a person skilled in the art according to the actual production condition, the combustion requirement and the energy supply requirement.

In the invention, the sampling system further comprises a flue gas circulation system. The air outlet of the smoke gas pumping device is preferably respectively communicated with the air inlet of the smoke gas circulating system and the outside of the system.

The invention is characterized in that the specific selection of the flue gas circulation system is not particularly limited in principle, and the skilled person can select and adjust the flue gas circulation system according to the actual production condition, the combustion requirement and the energy supply requirement. More preferably, the plurality of air outlets are arranged on different planes of the simulation chamber. Specifically, the number of the plurality of air outlets is preferably 3 to 6, and more preferably 4 to 5. More specifically, an adjusting device is preferably arranged between the air outlet of the flue gas extraction device and the air inlet of the flue gas circulation system, and further, adjusting devices are preferably arranged at the air outlets respectively. In the present invention, the flue gas extraction device is associated with the flue gas circulation system to realize the interlocking control, and more preferably, the flue gas circulation system, the air turbine device and the flue gas extraction device are associated to realize the interlocking control.

In the invention, the simulation cabin also comprises a spraying module. In particular, the spray module of the present invention comprises one or more, preferably 2, 3 or 4. More specifically, the plurality of spray modules are preferably arranged on different planes of the simulation cabin. In the invention, the temperature detection sensor, the humidity detection sensor and the spraying module are preferably associated to realize linkage control.

In the present invention, the sampling system preferably further comprises a computer control system. One or more of the flue gas circulation system, the combustion condition and product monitoring device, the air turbine device, the flue gas extraction device and the spray module are associated with the computer control system to realize interlocking control. The invention further preferably selects a flue gas circulating system, a combustion condition and product monitoring device, an air turbine device, a flue gas extraction device and a spraying module, and is associated with the computer control system to realize interlocking control.

The invention is not particularly limited in principle to the specific selection of the gaseous pollutants, which can be selected and adjusted by the skilled person according to the actual production conditions, combustion requirements and energy supply requirements, and is better to simulate, sample, monitor and collect data of the open-air combustion process of biomass under closed conditions, monitor the change characteristics of the gaseous pollutants, and obtain more accurate data, wherein the gaseous pollutants preferably comprise SO₂、NO_x、CO、O₃And NH₃More preferably SO₂、NO_x、CO、O₃And NH₃May be SO₂、NO_xCO and NH₃。

The invention is a complete and refined integral sampling system, better performs simulation, sampling, monitoring and data collection on the open-air combustion process of biomass under a closed condition, monitors the change characteristics of gaseous pollutants and obtains more accurate data, and the sampling system can specifically comprise:

a closed system consisting of a feeding device (a slide way sample placing device), a combustion device (an ignition device), a smoke collecting device (a PM sampler), a smoke exhaust device (a smoke exhaust device), a monitoring device (a combustion condition and product monitoring device), an air turbine device, a smoke exhaust device, a smoke circulating system, a spraying module and the like, and the volume of the closed system is 1m³The material is organic glass.

The feeding device adopts a rectangular slideway, the asbestos net is placed above the rectangular slideway, the rubber gloves are connected beside the rectangular slideway, and the hands of the feeding device can be directly extended out of the simulation bin to carry out the biomass ignition process.

The flue gas collecting device comprises a sampling pump and is used for PM in the biomass combustion process_2.5And PM₁The device comprises a combustion device, a particulate matter sample collecting device, a turbo fan, and an exhaust valve, wherein the turbo fan is arranged above the combustion device, and the exhaust valve is arranged at the pipeline of a smoke exhaust device.

The monitoring device comprises a temperature detection sensor, a humidity detection sensor and an SO₂、NO_xAnd the like.

Furthermore, temperature detection sensor, humidity detection sensing device and spraying module can be used for controlling the humidity in the box, and simulating the straw burning in rainy days, heavy fog, haze weather and other high-humidity air environments. The flue circulating pipeline system is internally provided with a controllable adjusting valve and a plurality of channels, is matched with an air turbine device, and jointly simulates an atmosphere circulating system (such as calm weather in gale weather, breeze weather, warm flow, cold air and the like)

Referring to fig. 1, fig. 1 is a schematic diagram of a sampling system for simulating open-air combustion of biomass according to the present invention. The system comprises a simulation cabin 1, a manual operation platform 2, an ignition device 3, a slide sample placing position 4, a PM2.5 sampler, a PM1 sampler 5, an air turbine device 6, a flue gas extraction device 7, a flue gas circulation system 8, flue gas circulation system air outlets in different positions 8-1-8-5, a gaseous pollutant monitoring device 9, a spraying module 10 and a computer control system 11.

The invention provides a sampling method for simulating open-air combustion of biomass by using a sampling system, which is characterized by comprising the following steps of:

1) carrying out ventilation treatment on the simulation cabin through a ventilation device, setting the sampling time of a PM sampler, the combustion condition and the sampling parameters of a product monitoring device at the same time until the state in the simulation cabin is constant, and then keeping the simulation cabin closed;

2) the dried biomass raw material is sent into a simulation cabin through a slideway sample placing device, and then the biomass raw material is ignited through a closed manual control operation device;

3) in the combustion process of the biomass raw material, an air turbine device in a simulation cabin is started, so that after combustion flue gas is uniformly dispersed, a PM sampler, a combustion condition and product monitoring device are started for sampling;

or in the combustion process of the biomass raw material, starting an air turbine device, a flue gas exhaust device, a flue gas circulating system, a spraying module and a computer control system in the simulation cabin to simulate the atmospheric state and the weather condition, and then starting a PM sampler, a combustion condition and a product monitoring device to sample.

The selection, structure and proportion of the device in the sampling method and the corresponding preferred principle of the invention can preferably correspond to the selection, structure and proportion of the device in the sampling system and the corresponding preferred principle, and are not described in detail herein.

According to the invention, firstly, the simulation cabin is ventilated through the ventilation device, and meanwhile, the sampling time of the PM sampler, the combustion condition and the sampling parameters of the product monitoring device are set until the state in the simulation cabin is constant, and then the simulation cabin is kept closed.

The invention is not particularly limited to the specific setting of the state constancy in the simulation cabin in principle, and can be selected and adjusted by a person skilled in the art according to the actual production condition, the combustion requirement and the energy supply requirement.

The dried biomass raw material is sent into the simulation cabin through the slideway sample placing device, and then is ignited through the closed manual control operation device.

The drying temperature is not particularly limited in principle, and can be selected and adjusted by a person skilled in the art according to actual production conditions, combustion requirements and energy supply requirements, the method is better for simulating, sampling, monitoring and data collecting the open-air combustion process of the biomass under a closed condition, monitoring the change characteristics of gaseous pollutants and obtaining more accurate data, and the drying temperature is preferably 105-120 ℃, more preferably 108-118 ℃, more preferably 110-115 ℃, and particularly can be 105 ℃.

The invention is not particularly limited in principle to the specific selection of the drying, and the skilled person can select and adjust the drying according to the actual production condition, the combustion requirement and the energy supply requirement.

The specific selection of the biomass raw material is not particularly limited in principle, and can be selected and adjusted by a person skilled in the art according to actual production conditions, combustion requirements and energy supply requirements. Specifically, the fineness of the biomass raw material is preferably 80-200 meshes, more preferably 100-180 meshes, more preferably 120-160 meshes, and particularly can be 100 meshes.

Finally, in the combustion process of the biomass raw material, the air turbine device in the simulation cabin is started, so that after the combusted smoke is uniformly dispersed, the PM sampler, the combustion condition and product monitoring device are started for sampling.

The invention is a complete and detailed integral sampling method, better performs simulation, sampling, monitoring and data collection on the open-air combustion process of biomass under a closed condition, monitors the change characteristics of gaseous pollutants, obtains more accurate data, can specifically comprise the following steps only according to the simple sampling method, and does not detailed the specific simulation process:

a preparation stage: cleaning a device for simulating open-air combustion of biomass, opening an air suction pump to enable air in the device to flow, and setting PM₁And PM_2.5Sampling time of the sampler, and SO₂、NO_xThe tightness of the simulation cabin is checked, and meanwhile, the simulation cabin is filled with air by utilizing compressed air.

The working stage is as follows: accurately weighing biomass straws by using a balance, drying and weighing in an oven, drying and weighing until the weight of the sample is constant, and placing the sample in a dryer for later use. Before a biomass sample combustion experiment is carried out, after a simulation cabin valve is opened, an air extractor is opened to carry out cabin air exchange, and after the temperature and the humidity of the simulation cabin are constant, the valve is closed to keep the cabin closed; the biomass after being weighed and dried is placed on the asbestos net, the cabin door is closed, the combustion process is carried out by utilizing the operation opening arranged on the simulation cabin, and in the combustion process, the air turbine device on the cabin top is opened, so that the smoke dust after combustion can be rapidly and uniformly distributed in the simulation cabin, and the sampling system is opened to collect the sample.

A cleaning stage: after sampling and measuring work of atmospheric pollutants generated by simulating open-air combustion of biomass straws is finished, closing the particulate matter sampling and gas testing device, opening the exhaust device, and after exhaust is finished, filling clean air into the simulation cabin for next experiment; meanwhile, experimental samples are collected and subjected to next experimental determination.

The invention provides a combustion sampling system for simulating open-air incineration emission of biomass and a sampling method for simulating open-air combustion of biomass. The invention particularly provides a sampling system for simulating open-air combustion of biomass. This burning sampling system that simulation living beings were burned in open air and were discharged has adopted special device and combination, mainly comprises material feeding unit, burner, sample collection device, exhaust (bleed) device and monitoring devices, can simulate, sample, monitor and data collection to the process of living beings open air burning under inclosed condition to obtain the more accurate data of living beings open air burning process. The system can simulate outdoor biomass combustion and simultaneously collect products after biomass combustion and PM generated in the biomass combustion process_2.5And PM₁The device and the method monitor the change characteristics of the gaseous pollutants and the like, and overcome the defects that the biomass combustion process cannot be simulated under a closed condition in the conventional research process, and the collected samples are greatly influenced by the external environment in the open-air combustion process. More importantly, the invention can also utilize a flue circulating pipeline system, an internal controllable adjusting valve and a plurality of channels to match with an air turbine device and a flue gas exhaust device by matching with various devices and simulate an atmospheric circulating system (such as calm and steady weather in strong wind weather, breeze weather, warm flow, cold air and the like) together, and in addition, the invention can be used for controlling the humidity in the box and simulating the straw combustion in high-humidity air environments such as rainy weather, strong fog weather, haze weather and the like by matching a temperature detection sensor and a humidity detection sensor with a spraying module so as to fit the open-air environment combustion and further analyze the difference. The system and the method provided by the invention are simple and easy to implement, good in controllability and low in cost, and are more beneficial to industrial popularization and application.

Experimental results show that the environment simulation cabin provided by the invention can better judge the pollution source and analyze the biomass combustion products and the influence of the biomass combustion products on the atmospheric environment compared with the existing outdoor measurement when biomass simulation combustion is carried out.

For further illustration of the present invention, the following will describe in detail a sampling system for simulating open-air combustion of biomass and a sampling method for simulating open-air combustion of biomass according to the present invention with reference to the following examples, but it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and the detailed implementation and specific operation procedures are given only for further illustration of the features and advantages of the present invention, and not for limitation of the claims of the present invention, and the scope of protection of the present invention is not limited to the following examples.

The reagents used in the following examples of the present invention are all commercially available.

Example 1

A preparation stage: cleaning a device for simulating open-air combustion of biomass, opening an air suction pump to enable air in the device to flow, and setting PM₁And PM_2.5Sampling time of the sampler, and SO₂、NO_xThe tightness of the simulation cabin is checked, and meanwhile, the simulation cabin is filled with air by utilizing compressed air.

The working stage is as follows: accurately weighing 5.00g of biomass raw material by using a balance, drying in a drying oven at 100 ℃ for 5h, weighing, drying for 2h, weighing until the weight of the sample is constant, and placing the sample in a dryer for later use. Before a biomass sample combustion experiment is carried out, after a simulation cabin valve is opened, an air extractor is opened to carry out cabin air exchange, and after the temperature and the humidity of the simulation cabin are constant, the valve is closed to keep the cabin closed; the biomass after being weighed and dried is placed on the asbestos net, the cabin door is closed, the combustion process is carried out by utilizing the operation opening arranged on the simulation cabin, and in the combustion process, the air turbine device on the cabin top is opened, so that the smoke dust after combustion can be rapidly and uniformly distributed in the simulation cabin, and the sampling system is opened to collect the sample.

Wherein the biomass raw materials are peanut shells, rice hulls, wheat straws and wood particles respectively.

A cleaning stage: after sampling and measuring work of atmospheric pollutants generated by simulating open-air combustion of biomass straws is finished, closing the particulate matter sampling and gas testing device, opening the exhaust device, and after exhaust is finished, filling clean air into the simulation cabin for next experiment; meanwhile, experimental samples are collected and subjected to next experimental determination.

The combustion characteristics of the combustion process provided by the embodiment 1 of the invention are researched, the PM2.5 particle samples collected in the combustion process are respectively subjected to heavy metal element and ion component analysis, and the appearance of the PM2.5 particle samples is observed at the same time, so that different biomass combustion characteristics are obtained.

Referring to table 1, table 1 shows physicochemical properties of the combustion system biomass and analysis of heavy metal elements after combustion, which are provided in the embodiment of the present invention.

TABLE 1

Referring to table 2, table 2 shows the analysis of the ion composition of the combustion system according to the embodiment of the present invention after the combustion of biomass.

TABLE 2

As can be seen from the data in tables 1 and 2, the simulated open-air biomass straw combustion system provided by the invention can accurately obtain the relevant data of normal combustion of biomass straws.

Referring to FIG. 2, FIG. 2 is a mass concentration analysis (10.19-10.22) of atmospheric PM2.5 at the beginning of a heating period in a straw burning period.

As can be seen from fig. 2, in the conventional conditions, the mass concentration of PM2.5 particles in the atmospheric environment is acquired in the straw combustion period, and the mass concentration of PM2.5 has a certain increase at the beginning (10.19 to 10.22) of the heating period, but the cause of the change cannot be accurately determined only from the change of the mass concentration of PM2.5 in the atmospheric environment, so that it is difficult to accurately determine the atmospheric change caused by straw combustion. The simulated combustion system provided by the invention is used for carrying out corresponding data simulation, and then combining the detection data of the region, the influence of biomass combustion on the atmosphere can be more accurately estimated and calculated subsequently, and the simulation device can be used for simulating and fitting the actual condition of the region, so that the difference is further analyzed.

While the present invention has been described in detail with respect to a sampling system for simulating open-air incineration emissions of biomass and a sampling method for simulating open-air combustion of biomass, the principles and embodiments of the present invention are described herein using specific examples, which are provided to facilitate an understanding of the methods and their core concepts, including the best mode, and to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any combination thereof. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The scope of the invention is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that approximate the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.