CN210662828U - Low-nitrogen combustion equipment for flue gas denitration engineering - Google Patents
Low-nitrogen combustion equipment for flue gas denitration engineering Download PDFInfo
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- CN210662828U CN210662828U CN201920702236.8U CN201920702236U CN210662828U CN 210662828 U CN210662828 U CN 210662828U CN 201920702236 U CN201920702236 U CN 201920702236U CN 210662828 U CN210662828 U CN 210662828U
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- flue gas
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- out stove
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Abstract
The utility model discloses a low nitrogen combustion apparatus for flue gas denitration engineering. The low-nitrogen combustion apparatus includes: circulating fluidized bed boiler, dust remover, draught fan, chimney, primary air fan, secondary air fan and take out stove smoke blower, it links to each other with the draught fan export to take out stove smoke blower import through the pipeline, it links to each other with the primary air fan air inlet case to take out stove smoke blower export through the pipeline. The boiler smoke pumping fan introduces the recirculated flue gas into the primary fan so as to convey the recirculated flue gas into a boiler hearth, and the recirculated flue gas can be fed for multiple times at different periods, so that the emission of nitrogen oxides is effectively inhibited.
Description
Technical Field
The utility model belongs to the technical field of coal-fired flue gas denitration, concretely relates to low nitrogen combustion apparatus suitable for flue gas denitration engineering.
Background
In the flue gas that fuel combustion process produced, contain a large amount of pollutants, such as nitrogen oxide, smoke and dust, acid gas etc. produce the harm of different degrees to the environment, at present the processing of nitrogen oxide generally adopts SNCR (selective catalytic reduction)'s denitration method, but SNCR denitration efficiency is slightly low, only lean on SNCR this traditional denitration means can't reach the emission requirement of nitrogen oxide, consequently for reducing the running cost, adapt to the emission requirement that is more and more strict, control the nitrogen oxide that produces in the combustion process through the combustion technology means, reduce the production of nitrogen oxide from the source, become the effective means of nitrogen oxide processing.
The low-nitrogen combustion technology of the flue gas recirculation method has obvious effect on reducing the emission of nitrogen oxides in the boiler, and because the flue gas absorbs heat and dilutes the oxygen concentration, the combustion speed and the temperature in the boiler are reduced, so that the production of the nitrogen oxides is reduced. The low-nitrogen combustion technology of the flue gas recirculation method greatly reduces the generation rate of nitrogen oxides, reduces the consumption of the reducing agent of the SNCR and saves the operation cost by lower investment. However, the prior art still lacks a low-nitrogen combustion device which can automatically control the introduction speed and the introduction time of the circulating flue gas.
Disclosure of Invention
Problem to be solved by utility model
In order to solve the problem that exists among the above prior art, the utility model provides a low nitrogen combustion apparatus for flue gas denitration engineering, the introduction process of low nitrogen combustion apparatus ability automatic control circulation flue gas is favorable to circulating fluidized bed boiler whole combustion process to be in the oxygen deficiency state, and is showing very much to reducing nitrogen oxide emission effect.
Means for solving the problems
The utility model provides a low nitrogen combustion apparatus for flue gas denitration engineering, include: circulating fluidized bed boiler, dust remover, draught fan, chimney, primary air fan, secondary air fan and take out stove smoke blower, take out stove smoke blower import pass through the pipeline with the draught fan export links to each other, take out stove smoke blower export pass through the pipeline with the primary air fan air inlet case links to each other.
According to a low nitrogen combustion apparatus for flue gas denitration engineering, take out stove cigarette fan exit and be provided with the flowmeter.
According to a low nitrogen combustion apparatus for flue gas denitration engineering, take out stove cigarette fan exit and be provided with the governing valve.
According to a low nitrogen combustion apparatus for flue gas denitration engineering, a serial communication port, the governing valve is the solenoid valve.
According to a low nitrogen combustion apparatus for flue gas denitration engineering, take out stove cigarette fan exit and be provided with teletransmission pressure transmitter.
Effect of the utility model
The utility model provides a low nitrogen combustion apparatus for flue gas denitration engineering, the opportunity that can the automatically regulated recirculated flue gas introduce and the flue gas volume of introducing make whole combustion process be in the oxygen deficiency state in the circulating fluidized bed boiler to effectively restrain nitrogen oxide's emission.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present invention and, together with the description, serve to explain the principles of the invention.
Fig. 1 shows a schematic diagram of a low-nitrogen combustion device for flue gas denitration engineering according to an embodiment of the present invention.
Description of the reference numerals
1-circulating fluidized bed boiler, 2-dust remover, 3-induced draft fan, 4-chimney, 5-primary air fan, 6-secondary air fan, 7-smoke exhaust fan and 8-flowmeter.
Detailed Description
Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, means, elements well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
Example 1
Fig. 1 shows a schematic diagram of a low-nitrogen combustion device for flue gas denitration engineering according to an embodiment of the present invention. As shown in fig. 1, the low-nitrogen combustion apparatus includes: circulating fluidized bed boiler 1, dust remover 2, draught fan 3, chimney 4, primary air fan 5, overfire air fan 6 and take out stove cigarette fan 7, take out stove cigarette fan 7 import and link to each other through pipeline and draught fan 3 export, take out stove cigarette fan 7 export and link to each other with primary air fan 5 air inlet case through the pipeline.
In this embodiment, the flue gas output by the induced draft fan 3 is pressurized by the furnace flue gas pumping fan 7, and then sent to the primary air fan 5 air inlet box, and then sent to the circulating fluidized bed boiler 1, so as to complete the circulation. The oxygen content in the flue gas is about 10 percent and is far lower than the oxygen content in the air by 21 percent, the method is suitable for being put into operation when the circulating fluidized bed boiler is under low load, and is beneficial to forming reducing atmosphere, so that the whole combustion process of the circulating fluidized bed boiler is in an anoxic state, and the reducing atmosphere has a very obvious effect on reducing the emission of nitrogen oxides. In addition, the flue gas participating in the recycling is derived from the cleaner flue gas output by the induced draft fan 3, and the risk of dust deposition on each pipeline can be reduced.
In a possible embodiment, a flow meter 8 and a regulating valve (not shown) are also provided at the outlet of the fume extractor 7. The flue gas amount of the recirculated flue gas input to the primary air fan 5 is adjusted by the flow meter 8 and the adjusting valve. The recirculated flue gas input into the circulating fluidized bed boiler 1 is not all fed once, but is supplemented along with the progress of combustion reaction, is favorable to the reduction of coke and carbon monoxide to nitric oxide under the oxygen deficiency state, greatly reduced the emission of nitrogen oxide, consequently can control the input of the recirculated flue gas of different periods of time through opening and shutting of governing valve. Preferably, the regulating valve used is a solenoid valve.
In a possible embodiment, a remote pressure transmitter (not shown) is also provided at the outlet of the fume extractor 7. And the remote transmission pressure transmitter is connected with a DSC control system through signals, and the DSC control system controls the smoke volume of the recirculated smoke according to the signals transmitted by the pressure transmitter.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A low-nitrogen combustion device for flue gas denitration engineering comprises: circulating fluidized bed boiler, dust remover, draught fan, chimney, primary air fan, overfire air fan and take out stove smoke blower, its characterized in that, take out stove smoke blower import through the pipeline with the draught fan export links to each other, take out stove smoke blower export through the pipeline with the primary air fan air inlet case links to each other, it is provided with the flowmeter to take out stove smoke blower exit, it is provided with the governing valve to take out stove smoke blower exit, it is provided with teletransmission pressure transmitter to take out stove smoke blower exit, teletransmission pressure transmitter signal connection to DSC control system.
2. The low-nitrogen combustion device for flue gas denitration engineering according to claim 1, wherein the regulating valve is an electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920702236.8U CN210662828U (en) | 2019-05-16 | 2019-05-16 | Low-nitrogen combustion equipment for flue gas denitration engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920702236.8U CN210662828U (en) | 2019-05-16 | 2019-05-16 | Low-nitrogen combustion equipment for flue gas denitration engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210662828U true CN210662828U (en) | 2020-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920702236.8U Active CN210662828U (en) | 2019-05-16 | 2019-05-16 | Low-nitrogen combustion equipment for flue gas denitration engineering |
Country Status (1)
| Country | Link |
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| CN (1) | CN210662828U (en) |
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2019
- 2019-05-16 CN CN201920702236.8U patent/CN210662828U/en active Active
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