1. The utility model provides a device of buggy calorific value on-line monitoring, includes the monitoring pipeline with buggy pipeline (1) intercommunication, its characterized in that: the monitoring pipeline is provided with an opening and closing valve (2), an igniter (10) and a combustion chamber (8) from inside to outside in sequence, the monitoring pipeline is provided with a temperature measuring point (5) located at the combustion chamber (8), and the outer end of the monitoring pipeline is an opening communicated with the combustion chamber (8).

2. The device for on-line monitoring the calorific value of pulverized coal according to claim 1, wherein: the monitoring pipeline is L-shaped, one end of the monitoring pipeline is horizontally arranged and communicated with the vertical pulverized coal pipeline (1), and the other end of the monitoring pipeline is vertically arranged and faces upwards.

3. The device for on-line monitoring the calorific value of pulverized coal according to claim 1 or 2, wherein: the monitoring pipeline be L shape, open and close valve (2) are located the one end of monitoring pipeline, some firearm (10) are located the corner of monitoring pipeline, combustion chamber (8) are located the other end of monitoring pipeline.

4. The device for on-line monitoring the calorific value of pulverized coal according to claim 1, wherein: the monitoring pipeline is communicated with the gas source pipe (3), a shut-off valve (4) is arranged on the gas source pipe (3), and the gas source pipe (3) is communicated with scavenging gas and combustion-supporting gas respectively.

5. The device for on-line monitoring the calorific value of pulverized coal according to claim 4, wherein: the gas source pipe (3) faces the combustion chamber (8).

6. The device for on-line monitoring the calorific value of pulverized coal according to claim 1, wherein: the temperature measuring points (5) are provided with at least one layer, and each layer of temperature measuring points (5) is arranged on the outer side of the combustion cavity (8) along the circumferential direction.

7. The device for on-line monitoring the calorific value of pulverized coal according to claim 1, wherein: and the monitoring pipeline is provided with a cooling assembly positioned at the combustion cavity (8).

8. A monitoring method of the device for on-line monitoring of the calorific value of the pulverized coal as claimed in any one of claims 1 to 7 is characterized by comprising the following steps: opening the opening and closing valve (2), filling positive pressure coal powder in the coal powder pipeline (1) into the monitoring pipeline, igniting the positive pressure coal powder by using an igniter (10), burning the positive pressure coal powder in the combustion cavity (8), forming a temperature field at the combustion cavity (8), acquiring a temperature value of the temperature field by using a temperature measuring point (5), closing the opening and closing valve (2) after the temperature value is acquired, and analyzing the heat value of the coal powder by using a temperature field value acquired by the temperature measuring point.

9. The monitoring method according to claim 8, wherein: and after the combustion is finished, filling scavenging gas into the monitoring pipeline to clean the residual coal dust.

10. The monitoring method according to claim 8 or 9, characterized in that: during combustion, combustion-supporting gas is filled into the monitoring pipeline to assist the positive-pressure pulverized coal to combust.

Background

In a power station system, real-time monitoring of the calorific value of the pulverized coal of a boiler is always a difficult problem. At present, a power plant usually completes analysis and test of the heat value of the pulverized coal by sampling the pulverized coal and analyzing the pulverized coal in a laboratory. In the process of analyzing the heat value, the coal powder is sampled firstly and then analyzed in a laboratory, about 2 hours is usually needed, the hysteresis is extremely poor, the monitoring of the heat value of the coal powder is not facilitated, and the adjustment of a steam boiler is guided. For the units with unstable coal quality, such as the co-combustion unit, especially the units with the non-strict supervision of foreign coal ships, etc., the coal quality has large change, unstable heat value and certain hysteresis, which is not favorable for guiding the actual operation and adjustment and is not favorable for the economy of the boiler.

At present, the invention patents for on-line monitoring by analysis methods such as spectrum and microwave are available, but the cost is high, the practicability is limited, and power plants at home and abroad are not put into use, so that the real-time performance of pulverized coal calorific value analysis is always restricted.

The laboratory analyzes the coal dust, and has component analysis besides the coal dust heat value, but can obtain the coal dust heat value information instantly and achieve the purpose of a sampling device in terms of directly and effectively guiding operation, and the laboratory is generally limited by the real-time property of coal dust heat value analysis in the market or power plants at home and abroad.

Disclosure of Invention

The invention aims to: the invention provides a device and a method for on-line monitoring of coal dust calorific value, which solve the technical problem that the coal dust calorific value cannot be monitored on line in real time.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a device of buggy calorific value on-line monitoring, includes the monitoring pipeline with buggy pipeline intercommunication, is equipped with on-off valve, some firearm and burning chamber from inside to outside in proper order on the monitoring pipeline, is equipped with the temperature measurement station that is located burning chamber department on the monitoring pipeline, and the outer end of monitoring pipeline is for the uncovered with burning chamber intercommunication. The on-off valve is used for controlling the on-off of the monitoring pipeline and the pulverized coal pipeline, the igniter is used for igniting pulverized coal, the combustion cavity is used for combusting pulverized coal, and the temperature measuring point is used for detecting a temperature field formed by combusting pulverized coal.

Furthermore, the monitoring pipeline is L-shaped, one end of the monitoring pipeline is horizontally arranged and communicated with the vertical pulverized coal pipeline, and the other end of the monitoring pipeline is vertically arranged and faces upwards. Therefore, the positive pressure coal powder in the vertical coal powder pipeline is introduced into the vertical section through the horizontal section, and the combustion is carried out in the vertical section upwards.

Furthermore, the monitoring pipeline be L shape, the on-off valve is located the one end of monitoring pipeline, the point firearm is located the corner of monitoring pipeline, the combustion chamber is located the other end of monitoring pipeline. All parts are reasonably distributed, the volume of the whole structure is reduced, and the normal and stable operation of combustion monitoring can be ensured.

Furthermore, the opening and closing valve is a quick-opening pneumatic valve, so that the pipeline can be quickly opened and closed.

Furthermore, the monitoring pipeline is communicated with the gas source pipe, the gas source pipe is provided with a shutoff valve, the gas source pipe is respectively communicated with the cleaning gas and the combustion-supporting gas, the pipeline is swept through the cleaning gas, and the combustion-supporting gas is used for supporting combustion of the pulverized coal.

Furthermore, the gas source pipe faces the combustion cavity, so that the purging and combustion supporting can face the combustion chamber, and the action effect is direct.

Furthermore, the scavenging gas is compressed air, and the combustion-supporting gas is natural gas.

Furthermore, the temperature measuring points are provided with at least one layer, and each layer of temperature measuring points are arranged on the outer side of the combustion cavity along the circumferential direction, so that the uniform temperature detection of the whole outer wall of the temperature field is realized.

Furthermore, the monitoring pipeline is provided with a cooling assembly located at the combustion chamber, the type of the cooling assembly is not limited, and the combustion chamber can be rapidly cooled.

Furthermore, the cooling assembly is a cooling water tank, the upper end of the cooling water tank is provided with a water inlet pipe, and the lower end of the cooling water tank is provided with a water drain valve.

The monitoring method of the device for on-line monitoring of the calorific value of the pulverized coal comprises the following steps: opening the opening and closing valve, filling positive pressure coal powder in the coal powder pipeline into the monitoring pipeline, igniting the positive pressure coal powder by using an igniter, burning the positive pressure coal powder in the combustion cavity, forming a temperature field at the combustion cavity, acquiring the temperature value of the temperature field by using the temperature measuring point, closing the opening and closing valve after the temperature value is acquired, and analyzing the heat value of the coal powder by using the temperature field value acquired by the temperature measuring point.

Furthermore, after the combustion is finished, cleaning gas is filled into the monitoring pipeline to clean the residual coal dust.

Furthermore, during combustion, combustion-supporting gas is filled into the monitoring pipeline to assist the positive-pressure coal powder to combust.

The invention has the beneficial effects that: the technical problem that the coal dust cannot be monitored in real time in the industry at present is solved, and the method has technical guidance significance and great application value for the coal dust furnace, especially for a large unit with unstable coal quality.

The main scheme and the further selection schemes can be freely combined to form a plurality of schemes which are all adopted and claimed by the invention; in the invention, the selection (each non-conflict selection) and other selections can be freely combined. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure: 1 is a pulverized coal pipeline; 2 is an opening and closing valve; 3 is a gas source pipe; 4 is a shut-off valve; 5 is a temperature measuring point; 6 is a water drain valve; 7 is a cooling water tank; 8 is a combustion chamber; 9 is a water inlet pipe; and 10 is an igniter.

Detailed Description

The following non-limiting examples serve to illustrate the invention.

Example 1:

referring to fig. 1, the device for on-line monitoring of the calorific value of pulverized coal comprises a pulverized coal pipeline 1, a monitoring pipeline, an opening and closing valve 2, a gas source pipe 3, a shutoff valve 4, a temperature measuring point 5, a cooling assembly, a combustion chamber 8 and an igniter 10.

The pulverized coal pipeline 1 is vertically arranged, and after coal is ground into powder by a coal mill, positive pressure pulverized coal above 1kPa is arranged in the pulverized coal pipeline through the pulverized coal pipeline. The monitoring pipeline is L-shaped, one end of the monitoring pipeline is horizontally arranged and communicated with the vertical pulverized coal pipeline 1, and the other end of the monitoring pipeline is vertically arranged and faces upwards.

The monitoring pipeline is sequentially provided with an opening and closing valve 2, an igniter 10 and a combustion chamber 8 from inside to outside, and the outer end of the monitoring pipeline is an opening communicated with the combustion chamber 8.

The opening and closing valve 2 is a quick-opening pneumatic valve, is positioned at the horizontal section of the monitoring pipeline and is used for controlling the communication between the monitoring pipeline and the pulverized coal pipeline. The igniter 10 is located outside the corner of the monitoring pipe for igniting the pulverized coal to be burned. The combustion chamber 8 is located in the vertical section of the monitoring pipe for providing space for pulverized coal combustion. The opening at the outer end of the monitoring pipeline provides oxygen for the combustion chamber.

The monitoring pipeline is provided with a temperature measuring point 5 positioned at the combustion cavity 8. The temperature measuring points 5 are provided with at least one layer, and each layer of temperature measuring points 5 is arranged on the outer side of the combustion cavity 8 along the circumferential direction. The temperature measuring point can adopt a temperature sensor for monitoring the temperature value of a temperature field formed by burning the pulverized coal.

The horizontal segment of monitoring pipeline and air supply pipe 3 intercommunication to air supply pipe 3 is towards combustion chamber 8, and it is better to guarantee to clean and combustion-supporting effect. And a shut-off valve 4 is arranged on the air source pipe 3 and is used for controlling the communication between an external air source and the monitoring pipeline. The gas source pipe 3 is respectively communicated with the scavenging gas and the combustion-supporting gas, the scavenging gas is compressed air, the residual coal dust is swept through high-pressure air, the combustion-supporting gas is natural gas, the combustion of the coal dust is assisted, the coal dust is helped to burn faster and better, and the combustion efficiency is improved.

The monitoring pipeline is provided with a cooling assembly positioned at the combustion chamber 8. The cooling assembly is a cooling water tank 7 which is annularly arranged, the upper end of the cooling water tank 7 is provided with a water inlet pipe 9, the lower end of the cooling water tank 7 is provided with a water drain valve 6, and cooling water in the cooling water tank absorbs heat of the outer wall of the combustion chamber, so that the combustion chamber is rapidly cooled.

Example 2:

referring to fig. 1, a monitoring method of the device for on-line monitoring of the calorific value of pulverized coal includes the following steps: opening the on-off valve 2, filling the positive pressure coal powder in the coal powder pipeline 1 into the monitoring pipeline, igniting the positive pressure coal powder by using an igniter 10, burning the positive pressure coal powder in the combustion cavity 8, forming a temperature field at the combustion cavity 8, acquiring the temperature value of the temperature field by using the temperature measuring point 5, closing the on-off valve 2 after the temperature value is acquired for 3s generally, and analyzing the heat value of the coal powder by using the temperature field value acquired by using the temperature measuring point.

And after the combustion is finished, filling scavenging gas into the monitoring pipeline to clean the residual coal dust. During combustion, combustion-supporting gas is filled into the monitoring pipeline to assist the positive-pressure pulverized coal to combust.

The method is characterized in that the corresponding relation between the temperature field and the heat value of the pulverized coal is obtained, the heat value of the pulverized coal is different, the temperature fields formed by the pulverized coal on the combustion cavity at the same time are different, and the size of the heat value of the pulverized coal can be directly judged by using the data size of the temperature field after the pulverized coal is combusted each time. Meanwhile, when the method is used for manufacturing a curve corresponding to the monitoring coal dust heat value and the temperature field, the timeliness and the quantificational property are required to be ensured, so that the same amount of coal dust/combustion-supporting fuel gas fed into the combustion cavity in the same time is ensured, and the accurate coal dust heat value can be obtained.

The foregoing basic embodiments of the invention and their various further alternatives can be freely combined to form multiple embodiments, all of which are contemplated and claimed herein. In the scheme of the invention, each selection example can be combined with any other basic example and selection example at will. For example, fig. … … can also be regarded as a combination of the basic example and the option … …, fig. … … can also be regarded as a combination of the basic example and the option … …, and so on, which are not exhaustive, and those skilled in the art can recognize many combinations.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.