CN214973033U - Denitration reductant flow cooperative control system - Google Patents
Denitration reductant flow cooperative control system Download PDFInfo
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- CN214973033U CN214973033U CN202023021405.3U CN202023021405U CN214973033U CN 214973033 U CN214973033 U CN 214973033U CN 202023021405 U CN202023021405 U CN 202023021405U CN 214973033 U CN214973033 U CN 214973033U
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Abstract
The utility model relates to a denitration reductant flow cooperative control system, including the reductant pump, the spray gun, first analysis appearance, the converter, calculation module, flow control module, governing valve and flow analysis appearance, first analysis appearance is connected with calculation module, send the nitrogen oxide content that detects for calculation module, calculation module and flow control module are connected, calculation module sends the calculation flow that calculates for flow control module, flow analysis appearance and governing valve set up on the connecting pipe, flow analysis appearance is between spray gun and governing valve, be connected with flow control module, send the real-time flow that detects the reductant in the connecting pipe for flow control module, flow control module all is connected with converter and governing valve, send control signal for converter and governing valve, the converter is connected with the reductant pump electricity. The utility model discloses the flow of governing valve and converter cooperative control reductant, degree of automation is high, and control is accurate, and has reduced the cost of labor.
Description
Technical Field
The utility model belongs to the technical field of the flue gas denitration technique and specifically relates to a denitration reductant flow cooperative control system.
Background
With the overall improvement of the social development level, the demand of the public on electric power resources is continuously improved, but in the power generation process of a thermal power plant, a large amount of nitrides are often discharged from boiler combustion, the nitrides are important sources of air pollution, and in order to protect the environment and reduce the emission of waste gas substances, the emission of the nitrides is reasonably limited by the thermal power plant or related enterprises.
Usually, an NCR + SCR coupling denitration process is adopted, 20% of reducing agent is adopted as the reducing agent in the SNCR + SCR coupling denitration reaction, and the flow control precision of the reducing agent directly influences the denitration efficiency and whether the finally discharged nitrogen oxide concentration reaches the standard or not. Because the difference between the power consumption in the day and the power consumption at night is large, the load difference between the load of the thermoelectric boiler at night and the load of the thermoelectric boiler in the day is large, the consumption of the reducing agent needing to participate in reduction is obviously increased when the thermoelectric boiler runs under an overload condition, the difference between the minimum consumption and the maximum consumption is more than fifteen times, and the flow of the reducing agent is controlled by adopting a variable frequency regulation mode of a reducing agent metering pump or a mode of operating a multistage centrifugal pump at power frequency and adding an adjusting valve.
The above-mentioned techniques have at least the following problems: the two adjusting modes can not control the flow of the reducing agent to the maximum consumption and the minimum consumption simultaneously, manual adjustment of a backflow or main path throttling device is needed for many times, and the flow of the reducing agent can not be accurately controlled.
SUMMERY OF THE UTILITY MODEL
The above-mentioned not enough to prior art exists, the utility model provides a denitration reductant flow cooperative control system to improve the control to denitration reductant flow.
In order to achieve the above object, the utility model provides a denitration reductant flow cooperative control system, including the reductant pump, the spray gun, SNCR reaction vessel, first analysis appearance and converter, former agent pump passes through the connecting pipe with the spray gun and is connected, the rifle head of spray gun stretches into in the SNCR reaction vessel, the converter is connected with former agent pump electricity, first analysis appearance is used for the nitrogen oxide content of real-time measurement flue gas in the boiler, a serial communication port, still include calculation module, flow control module, governing valve and flow analysis appearance, the telecommunications output of first analysis appearance is connected with the telecommunications input of calculation module, send the nitrogen oxide content that detects to calculation module, the telecommunications output of calculation module is connected with the telecommunications input of flow control module, calculation module sends the calculated flow for flow control module, flow analysis appearance and governing valve set up on the connecting pipe, the flow analyzer is arranged between the spray gun and the regulating valve, the telecommunication output end of the flow analyzer is connected with the telecommunication input end of the flow control module, the real-time flow of the reducing agent in the connecting pipe is detected and sent to the flow control module, the telecommunication output ends of the flow control module are connected with the telecommunication input end of the frequency converter and the telecommunication input end of the regulating valve, the control signal is sent to the frequency converter and the regulating valve, the frequency converter is electrically connected with the reducing agent pump, the pumping frequency of the reducing agent pump is changed according to the control signal, and the opening degree of the regulating valve is changed according to the control signal.
The utility model discloses an in current denitration reductant control system, the calculation module has been increased, flow control module, governing valve and flow analysis appearance, the calculation module can calculate the reductant that needs consumed and calculate the flow, flow control module calculates the real-time flow of the reductant that flow and flow analysis appearance sent and come and sends control signal for converter and governing valve according to the reductant, the aperture of control governing valve and the frequency of converter, the flow of governing valve and converter cooperative control reductant, can be according to the flow with the automatic accurate control reductant of electric quantity, degree of automation is high, control is accurate, and the cost of labor has been reduced.
Drawings
Fig. 1 is a block diagram of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the denitration reducing agent flow cooperative control system includes a boiler 11, an SNCR reaction vessel 9, a reducing agent pump 3, a spray gun 4, a first analyzer 1, a frequency converter 2, a calculation module 5, a flow control module 7, a regulating valve 6, and a flow analyzer 8. The flue gas in the boiler is passed into the SNCR reaction vessel 9. The reducing agent pump 3 and the spray gun 4 are connected by a connecting pipe 31, the regulating valve 6 and the flow analyzer 8 are provided on the connecting pipe 31, and the flow analyzer 8 is between the regulating valve 6 and the spray gun 4. The reducing agent pump 3 is used for providing power for the flow of the reducing agent, and pumping and sending the reducing agent in the reducing agent distribution tank into the connecting pipe 31. The regulating valve 6 is used for regulating the flow of the reducing agent in the connecting pipe 31, the flow analyzer 8 is used for measuring the flow of the reducing agent in the connecting pipe 31 in real time, and the gun head of the spray gun 4 extends into the SNCR reaction vessel 9 to spray the reducing agent in the connecting pipe 31 onto the flue gas.
The first analyzer 1 is used for measuring the content X of nitrogen oxides in flue gas in a boiler in real time, the telecommunication output end of the first analyzer is connected with the telecommunication input end of the reducing agent calculating module 5, and the detected content X of nitrogen oxides is sent to the calculating module 5. The calculation module 5 inputs a preset value Y of the emission concentration of nitrogen oxides discharged into the atmosphere, calculates a difference value Z between X and Y, and converts the calculated flow A of the amount of the reducing agent to be consumed according to the difference value Z. The telecommunication output end of the calculating module 5 is connected with the telecommunication input end of the flow control module 7, and the calculated flow A is sent to the flow control module 7. The telecommunication output end of the flow analyzer 8 is connected with the telecommunication input end of the flow control module 7, and is used for detecting the real-time flow B of the reducing agent in the connecting pipe 31 and feeding back the detected real-time flow B to the flow control module 7. The flow control module 7 is a controller, the telecommunication output end of the flow control module is connected with the telecommunication input end of the frequency converter 2 and the telecommunication input end of the regulating valve 6, the flow control module 7 compares the calculated flow A of the reducing agent with the real-time flow B to calculate the difference value between the A and the B, then the difference value is converted into a control signal, and the control signal is sent to the regulating valve 6 and the frequency converter 2. The regulating valve 6 changes the opening degree in accordance with the control signal, thereby changing the flow rate of the reducing agent in the connecting pipe 31. The frequency converter 2 is electrically connected with the reducing agent pump 3, and changes the frequency of the reducing agent pumped by the reducing agent pump 3 according to the control signal.
The system further comprises an SCN reaction device 10, a flue gas electric dust removal device 12 and a second analyzer 13, wherein the SNCR reaction container 9, the SCN reaction device 10 and the flue gas electric dust removal device 12 are sequentially connected through a flue gas pipeline, a reactant in the SNCR reaction container 9 is introduced into the SCN reaction device 10, and a reactant in the SCN reaction device 10 is introduced into the flue gas electric dust removal device 12. The second analyzer 13 is used for measuring the concentration of second oxynitride in the flue gas electric dust removal device 12 in real time, the telecommunication output end of the second analyzer is connected with the calculation module 5, the measured concentration of the second oxynitride is sent to the calculation module 5, the calculation module 5 calculates the flow of the reducing agent to be increased again, the flow of the reducing agent to be increased is sent to the flow control module 7, and the flow control module 7 sends a control signal to the regulating valve 6 and the frequency converter 2 after calculation.
The first analyzer 1 and the second analyzer 13 are both CEMS analyzers, and the flow analyzer 8 is an electromagnetic flow meter.
The utility model discloses an in current denitration reductant control system, the calculation module has been increased, flow control module, governing valve and flow analysis appearance, the calculation module can calculate the reductant that needs consumed and calculate the flow, flow control module calculates the real-time flow of the reductant that flow and flow analysis appearance sent and come and sends control signal for converter and governing valve according to the reductant, the aperture of control governing valve and the frequency of converter, the flow of governing valve and converter cooperative control reductant, can be according to the flow with the automatic accurate control reductant of electric quantity, degree of automation is high, control is accurate, and the cost of labor has been reduced.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (2)
1. A denitration reducing agent flow cooperative control system comprises a reducing agent pump (3), a spray gun (4), an SNCR reaction container (9), a first analyzer (1) and a frequency converter (2), wherein the reducing agent pump (3) is connected with the spray gun (4) through a connecting pipe (31), a gun head of the spray gun (4) extends into the SNCR reaction container (9), the first analyzer (1) is used for measuring the content of nitrogen oxides in flue gas in a boiler in real time, the denitration reducing agent flow cooperative control system is characterized by further comprising a calculation module (5), a flow control module (7), a regulating valve (6) and a flow analyzer (8), a telecommunication output end of the first analyzer (1) is connected with a telecommunication input end of the calculation module (5) and sends the detected content of nitrogen oxides to the calculation module (5), a telecommunication output end of the calculation module (5) is connected with a telecommunication input end of the flow control module (7), the calculation module (5) sends the calculated flow to the flow control module (7), the flow analyzer (8) and the regulating valve (6) are arranged on the connecting pipe (31), the flow analyzer (8) is arranged between the spray gun (4) and the regulating valve (6), the telecommunication output end of the flow control module (7) is connected with the telecommunication input end of the flow control module (7), the detected real-time flow of the reducing agent in the connecting pipe (31) is sent to the flow control module (7), the telecommunication output ends of the flow control module (7) are connected with the telecommunication input end of the frequency converter (2) and the telecommunication input end of the regulating valve (6), control signals are sent to the frequency converter (2) and the regulating valve (6), the frequency converter (2) is electrically connected with the reducing agent pump (3), the pumping frequency of the reducing agent pump (3) is changed according to the control signal, and the opening degree of the regulating valve (6) is changed according to the control signal.
2. The denitration reducing agent flow cooperative control system of claim 1, further comprising an SCN reaction device (10), a flue gas electric dust removal device (12) and a second analyzer (13), wherein the SNCR reaction container (9), the SCN reaction device (10) and the flue gas electric dust removal device (12) are sequentially connected through a flue gas pipeline, the second analyzer (13) is used for measuring the content of second oxynitride in the flue gas electric dust removal device in real time, and the telecommunication output end of the second analyzer (13) is connected with the telecommunication input end of the calculation module (5) and sends the content of the second oxynitride to the calculation module (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023021405.3U CN214973033U (en) | 2020-12-15 | 2020-12-15 | Denitration reductant flow cooperative control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023021405.3U CN214973033U (en) | 2020-12-15 | 2020-12-15 | Denitration reductant flow cooperative control system |
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| Publication Number | Publication Date |
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| CN214973033U true CN214973033U (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023021405.3U Active CN214973033U (en) | 2020-12-15 | 2020-12-15 | Denitration reductant flow cooperative control system |
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| CN (1) | CN214973033U (en) |
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- 2020-12-15 CN CN202023021405.3U patent/CN214973033U/en active Active
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