1. The utility model provides a mud independent incinerator system which characterized in that: the waste heat boiler comprises an incinerator (2), a high-temperature cyclone dust collector (3), a waste heat furnace (4) and a low-temperature dust collector (5), wherein the incinerator (2), the high-temperature cyclone dust collector (3), the waste heat furnace (4) and the low-temperature dust collector (5) are communicated in sequence, a smoke outlet of the low-temperature dust collector (5) is communicated with the incinerator (2) by virtue of a connecting pipeline, and a drainage fan (6) and a reflux fan (7) are arranged on the connecting pipeline; under the action of the drainage fan (6) and the reflux fan (7), the flue gas at the flue gas outlet of the low-temperature dust remover (5) flows into the hearth of the incinerator (2) through the connecting pipeline.

2. The sludge independent incinerator system according to claim 1, characterized in that: the flue gas outlet of the incinerator (2) is connected with the flue gas inlet pipeline of the high-temperature cyclone dust collector (3), the flue gas outlet of the high-temperature cyclone dust collector (3) is connected with the flue gas inlet pipeline of the waste heat furnace (4), and the flue gas outlet of the waste heat furnace (4) is connected with the flue gas inlet pipeline of the low-temperature dust collector (5).

3. The sludge independent incinerator system according to claim 1, characterized in that: and a dust outlet of the high-temperature cyclone dust collector (3) is connected with an external cooling equipment pipeline.

4. The sludge independent incinerator system according to claim 1, characterized in that: a plurality of flue gas return ports are formed in the wall of the incinerator (2), and the flue gas outlet of the low-temperature dust remover (5) is connected with the flue gas return ports through the connecting pipeline.

5. The sludge independent incinerator system according to claim 4, characterized in that: the drainage fan (6) and the backflow fan (7) are both fixedly arranged on the connecting pipeline and are used for driving smoke to flow in the connecting pipeline; on the connecting pipeline, the drainage fan (6) is closer to one side of the waste heat furnace (4) than the reflux fan (7), and the reflux fan (7) is closer to one side of the incinerator (2) than the drainage fan (6).

6. The sludge independent incinerator system according to claim 4, characterized in that: a plurality of temperature adjusting devices (1) used for controlling the temperature in the hearth are further arranged in the hearth of the incinerator (2), and the number and the arrangement positions of the temperature adjusting devices (1) are in one-to-one matching correspondence with the number and the arrangement positions of the flue gas backflow ports.

7. The utility model provides a mud independent incinerator system which characterized in that: the waste heat boiler comprises an incinerator (2), a high-temperature cyclone dust collector (3), a waste heat furnace (4) and a low-temperature dust collector (5), wherein the incinerator (2), the high-temperature cyclone dust collector (3), the waste heat furnace (4) and the low-temperature dust collector (5) are communicated in sequence, a smoke outlet of the low-temperature dust collector (5) is communicated with the incinerator (2) by virtue of a connecting pipeline, and a drainage fan (6) and a reflux fan (7) are arranged on the connecting pipeline; under the action of the drainage fan (6) and the reflux fan (7), the flue gas at the flue gas outlet of the low-temperature dust remover (5) flows into the hearth of the incinerator (2) through the connecting pipeline; the flue gas outlet of the incinerator (2) is connected with the flue gas inlet pipeline of the high-temperature cyclone dust collector (3), the flue gas outlet of the high-temperature cyclone dust collector (3) is connected with the flue gas inlet pipeline of the waste heat furnace (4), and the flue gas outlet of the waste heat furnace (4) is connected with the flue gas inlet pipeline of the low-temperature dust collector (5); the dust outlet of the high-temperature cyclone dust collector (3) is connected with an external cooling equipment pipeline; a plurality of flue gas return ports are formed in the wall of the incinerator (2), and the flue gas outlet of the low-temperature dust remover (5) is connected with the plurality of flue gas return ports through a pipeline by virtue of the connecting pipeline; the drainage fan (6) and the backflow fan (7) are both fixedly arranged on the connecting pipeline and are used for driving smoke to flow in the connecting pipeline; on the connecting pipeline, the drainage fan (6) is closer to one side of the waste heat furnace (4) than the reflux fan (7), and the reflux fan (7) is closer to one side of the incinerator (2) than the drainage fan (6); a plurality of temperature adjusting devices (1) used for controlling the temperature in the hearth are further arranged in the hearth of the incinerator (2), and the number and the arrangement positions of the temperature adjusting devices (1) are in one-to-one matching correspondence with the number and the arrangement positions of the flue gas backflow ports.

Background

With the acceleration of the urbanization process in China, the treatment modes of sewage and sludge in cities are changing continuously. In the early development of sludge treatment technology in China, landfill treatment is mainly used as a main technical means, in recent years, due to the increase of environmental protection pressure, reduction, recycling and harmless treatment of sludge gradually become the current main technical targets, and at the present stage, China is applied to the most extensive independent sludge incineration technology.

As for the independent sludge incineration technology, the bubbling fluidized bed is the main one in foreign countries at present, while the incineration technology with the fluidization speed between the high-speed fluidized bed and the bubbling fluidized bed is the main one in domestic technology, and the equipment quantity is relatively short, so that compared with developed countries, China is still in the beginning stage in this respect.

In the actual sludge incineration process, because the fluctuation of the low-level heating value and the water content of the sludge entering the furnace is relatively large, the temperature of the flue gas in the hearth can be synchronously changed. In order to better control the combustion temperature, when the temperature of smoke in the hearth is too high, the smoke temperature is reduced by adopting a mode of spraying water from the top of the hearth; when the temperature of the smoke in the hearth is too low (lower than 850 ℃), auxiliary fuel needs to be supplemented to improve the temperature of the smoke. The cooling is carried out by spraying water from the top of the furnace, and although the operation process is quick and effective, the energy waste phenomenon is serious. One ton of water for cooling at normal temperature is evaporated by absorbing heat in the furnace to form low-pressure high-temperature steam which is taken away along with the flue gas, and finally the low-pressure high-temperature steam is discharged along with the flue gas in the form of superheated steam at 160-200 ℃ at the tail section of the waste heat furnace, wherein the taken heat is about 2796 MJ-2875 MJ (64.8-66.7 ten thousand kilocalories). Meanwhile, the water content of the sludge per se is about 35-40% under the ordinary condition, the water content of the flue gas generated in the incineration process is also very high, the burden of tail flue gas treatment equipment is increased by adding cooling water, and the problems of bag application phenomenon aggravation and the like of bag type dust removal equipment are caused.

In summary, how to provide an independent sludge incinerator system under the existing technical conditions to reasonably control the temperature in the hearth, prevent energy waste and prolong the service life of tail flue gas treatment equipment is the problem to be solved by technical staff in the industry.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a sludge independent incinerator system, as follows.

A sludge independent incinerator system comprises an incinerator, a high-temperature cyclone dust collector, a waste heat furnace and a low-temperature dust collector, wherein the incinerator, the high-temperature cyclone dust collector, the waste heat furnace and the low-temperature dust collector are communicated in sequence, a smoke outlet of the low-temperature dust collector is communicated with the incinerator by virtue of a connecting pipeline, and a drainage fan and a reflux fan are arranged on the connecting pipeline; under the action of the drainage fan and the backflow fan, the flue gas at the flue gas outlet of the low-temperature dust remover flows into the hearth of the incinerator through the connecting pipeline.

Preferably, the flue gas outlet of the incinerator is connected with the flue gas inlet pipeline of the high-temperature cyclone dust collector, the flue gas outlet of the high-temperature cyclone dust collector is connected with the flue gas inlet pipeline of the waste heat furnace, and the flue gas outlet of the waste heat furnace is connected with the flue gas inlet pipeline of the low-temperature dust collector.

Preferably, the dust outlet of the high-temperature cyclone dust collector is connected with an external cooling equipment pipeline.

Preferably, the furnace wall of the incinerator is provided with a plurality of flue gas return ports, and the flue gas outlet of the low-temperature dust remover is connected with the plurality of flue gas return ports through a pipeline.

Preferably, the drainage fan and the return fan are both fixedly arranged on the connecting pipeline and used for driving smoke to flow in the connecting pipeline; on the connecting pipeline, the drainage fan is closer to one side of the waste heat furnace than the reflux fan, and the reflux fan is closer to one side of the incinerator than the drainage fan.

Preferably, a plurality of temperature adjusting devices for controlling the temperature in the hearth are further arranged in the hearth of the incinerator, and the number and the arrangement positions of the temperature adjusting devices are in one-to-one matching correspondence with the number and the arrangement positions of the flue gas backflow ports.

Preferably, the sludge independent incinerator system comprises an incinerator, a high-temperature cyclone dust collector, a waste heat furnace and a low-temperature dust collector, wherein the incinerator, the high-temperature cyclone dust collector, the waste heat furnace and the low-temperature dust collector are communicated in sequence, a smoke outlet of the low-temperature dust collector is communicated with the incinerator by virtue of a connecting pipeline, and a drainage fan and a reflux fan are arranged on the connecting pipeline; under the action of the drainage fan and the backflow fan, the flue gas at the flue gas outlet of the low-temperature dust remover flows into the hearth of the incinerator through the connecting pipeline; the flue gas outlet of the incinerator is connected with the flue gas inlet pipeline of the high-temperature cyclone dust collector, the flue gas outlet of the high-temperature cyclone dust collector is connected with the flue gas inlet pipeline of the waste heat furnace, and the flue gas outlet of the waste heat furnace is connected with the flue gas inlet pipeline of the low-temperature dust collector; the dust outlet of the high-temperature cyclone dust collector is connected with an external cooling equipment pipeline; a plurality of flue gas return ports are formed in the wall of the incinerator, and the flue gas outlet of the low-temperature dust remover is connected with the plurality of flue gas return ports through a pipeline by virtue of the connecting pipeline; the drainage fan and the backflow fan are both fixedly arranged on the connecting pipeline and are used for driving smoke to flow in the connecting pipeline; on the connecting pipeline, the drainage fan is closer to one side of the waste heat furnace than the reflux fan, and the reflux fan is closer to one side of the incinerator than the drainage fan; and a plurality of temperature adjusting devices for controlling the temperature in the hearth are also arranged in the hearth of the incinerator, and the number and the arrangement positions of the temperature adjusting devices are in one-to-one matching correspondence with the number and the arrangement positions of the flue gas backflow ports.

Compared with the prior art, the invention has the advantages that:

according to the sludge independent incinerator system, the flue gas with the temperature of 160-200 ℃ is sent to the middle upper part of the incinerator through the backflow fan by utilizing the principle of flue gas backflow, the flue gas serves as a heat exchange carrier, the low-temperature flue gas absorbs heat in the hearth and is heated, then the low-temperature flue gas enters the tail waste heat furnace, heat is transferred to the tail convection heating surface, the temperature is reduced, and then the low-temperature flue gas flows back into the hearth again, so that circulation is carried out, the temperature in the hearth is reasonably controlled, and meanwhile energy waste is avoided to the maximum extent. Meanwhile, the invention is different from the furnace top water spray cooling in the prior art, and water vapor in the hearth is not further increased, thereby reducing the burden of tail flue gas treatment equipment and prolonging the service life of the equipment.

In addition, the structure of the invention is relatively simple and reliable, enterprises can obtain the technical scheme of the invention by combining and transforming the existing equipment, the hardware manufacturing cost is relatively low, the energy-saving effect is very obvious, the invention is very suitable for large-scale popularization of production enterprises, and the application prospect is wide.

The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein: 1. a temperature adjusting device; 2. an incinerator; 3. a high temperature cyclone; 4. a waste heat furnace; 5. a low temperature dust remover; 6. a drainage fan; 7. and a reflux fan.

Detailed Description

As shown in figure 1, the invention discloses a sludge independent incinerator system, which adopts the following specific scheme.

A sludge independent incinerator system comprises an incinerator 2, a high-temperature cyclone dust collector 3, a waste heat furnace 4 and a low-temperature dust collector 5, wherein the incinerator 2, the high-temperature cyclone dust collector 3, the waste heat furnace 4 and the low-temperature dust collector 5 are communicated in sequence, a smoke outlet of the low-temperature dust collector 5 is communicated with the incinerator 2 through a connecting pipeline, and a drainage fan 6 and a backflow fan 7 are arranged on the connecting pipeline. Under the action of the drainage fan 6 and the backflow fan 7, the flue gas at the flue gas outlet of the low-temperature dust remover 5 flows into the hearth of the incinerator 2 through the connecting pipeline.

In terms of connection relation, the flue gas outlet of the incinerator 2 is connected with the flue gas inlet pipeline of the high-temperature cyclone dust collector 3, the flue gas outlet of the high-temperature cyclone dust collector 3 is connected with the flue gas inlet pipeline of the waste heat furnace 4, and the flue gas outlet of the waste heat furnace 4 is connected with the flue gas inlet pipeline of the low-temperature dust collector 5.

In the scheme, in consideration of the recovery of solid waste materials such as fly ash and the like, the dust outlet of the high-temperature cyclone dust collector 3 is connected with an external cooling device through a pipeline, and the cooled solid waste materials are sent into an ash warehouse to be stored for later use.

A plurality of flue gas return ports are formed in the wall of the incinerator 2, and the flue gas outlet of the low-temperature dust remover 5 is connected with the flue gas return ports through pipelines. And a plurality of temperature adjusting devices 1 for controlling the temperature in the hearth are also arranged in the hearth of the incinerator 2, and the number and the arrangement positions of the temperature adjusting devices 1 are in one-to-one matching correspondence with the number and the arrangement positions of the flue gas backflow ports.

The drainage fan 6 and the backflow fan 7 are both fixedly arranged on the connecting pipeline and used for driving smoke to flow in the connecting pipeline. On the connecting pipeline, the flow guiding fan 6 is closer to the waste heat furnace 4 side than the backflow fan 7, and the backflow fan 7 is closer to the incinerator 2 side than the flow guiding fan 6.

The effectiveness of the above scheme is illustrated below with reference to a specific implementation example:

when the water content of the sludge entering the furnace is 40 percent, the low-grade heating value is about 1800Kcal/Kg, the temperature of hot air entering the furnace is about 430 ℃, and the daily treatment capacity is 135t/d (after the wet sludge with the water content of 80 percent at 400t/d is half dried). According to theoretical calculation, the adiabatic combustion temperature in the incinerator 2 reaches 1378 ℃, if the adiabatic combustion temperature needs to be controlled at 880 ℃, a furnace top water spraying cooling mode in the prior art is adopted, the water spraying amount in the incinerator is about 3t/h, the heat quantity taken away by water vapor in tail smoke exhaust gas is about 194 ten thousand Kcal/h (the heat quantity of low-pressure steam is about 3.2 t/h), and the smoke exhaust loss is nearly 20%. By adopting the flue gas reflux technology, the total power consumption of the two fans is about 132Kw/h, the electricity price is calculated according to 0.725 yuan, and the electricity consumption cost per hour is about 95 yuan. The steam price is calculated according to 200 yuan/t, and 640 yuan/h can be saved. Compared with the prior art, the energy-saving effect of the invention is very obvious.

In summary, the sludge independent incinerator system provided by the invention utilizes the principle of flue gas backflow, flue gas with the temperature of 160-200 ℃ is sent to the middle upper part of the incinerator through the backflow fan, the flue gas is used as a heat exchange carrier, the low-temperature flue gas absorbs heat in the hearth and is heated, then the flue gas enters the tail waste heat furnace, heat is transferred to the tail convection heating surface, the temperature is reduced, and then the flue gas flows back into the hearth again, and the circulation is carried out, so that the energy waste is avoided to the maximum extent while the temperature in the hearth is reasonably controlled. Meanwhile, the invention is different from the furnace top water spray cooling in the prior art, and water vapor in the hearth is not further increased, thereby reducing the burden of tail flue gas treatment equipment and prolonging the service life of the equipment.

In addition, the structure of the invention is relatively simple and reliable, enterprises can obtain the technical scheme of the invention by combining and transforming the existing equipment, the hardware manufacturing cost is relatively low, the energy-saving effect is very obvious, the invention is very suitable for large-scale popularization of production enterprises, and the application prospect is wide.

The invention also provides reference for other related problems in the same field, can be expanded and extended based on the reference, is applied to related schemes of other sludge incineration equipment and methods in the field, and has very wide application prospect.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Finally, it should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should integrate the description, and the technical solutions in the embodiments can be appropriately combined to form other embodiments understood by those skilled in the art.