Ammonia injection control method and device for scr denitration device, medium and electronic equipment

Abstract

The present disclosure relates to a method, device, medium and electronic equipment for ammonia injection control of an SCR denitration device. The method comprises: determining a corrected ammonia requirement according to an SCR outlet NOx concentration and a preset NOx concentration given value; determining a theoretical ammonia requirement according to an SCR inlet NOx concentration and a flue gas amount; determining a feedforward amount according to operation state information of the SCR denitration device; and determining an opening degree of an ammonia injection total valve according to the theoretical ammonia requirement, the corrected ammonia requirement and the feedforward amount, to control the ammonia injection total valve. In this way, the deviation of the SCR outlet NOx emission concentration can be reduced, thereby reducing the ammonia escape amount, comprehensively improving the ammonia injection control quality, improving the safety and economy of the unit operation, and also being conducive to better controlling the SCR outlet NOx emission concentration and improving the comprehensive competitiveness of the unit.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of thermal automation of thermal power plants, in particular, to an ammonia injection control method, device, medium and electronic equipment of an SCR denitration device. BACKGROUND

[0002] With the increasingly stringent pollutant emission standards for thermal power plants, pollutant emission control of coal-fired generating units has become an important part of environmental protection management work of coal-fired power generation enterprises. SCR denitration technology is the most widely used and effective flue gas denitration technology in the world. In actual operation, the control of ammonia injection amount is particularly critical. Increasing the ammonia injection amount is beneficial to reducing the NOx emission concentration, but the ammonia escape rate will increase, which may cause the downstream air preheater to be blocked and corroded due to the deposition of ammonium bisulfate, and may also cause adverse effects such as dust accumulation on the electric dust collection electrode and dust sticking on the dust cloth. SUMMARY

[0003] The purpose of the present disclosure is to provide an ammonia injection control method, device, medium and electronic equipment of an SCR denitration device to reduce the deviation of the SCR outlet NOx emission concentration, thereby reducing the ammonia escape amount and improving the operation level of the denitration system.

[0004] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides an ammonia injection control method of an SCR denitration device, the method comprising:

[0005] determining a correction ammonia requirement according to the SCR outlet NOx concentration and a preset NOx concentration given value;

[0006] determining a theoretical ammonia requirement according to the SCR inlet NOx concentration and the flue gas amount;

[0007] determining a feedforward amount according to the operation state information of the SCR denitration device;

[0008] determining the opening degree of the ammonia injection total valve according to the theoretical ammonia requirement, the correction ammonia requirement and the feedforward amount, to control the action of the ammonia injection total valve.

[0009] Optionally, the method further comprises:

[0010] obtaining the NOx concentration and the O2 concentration corresponding to each ammonia injection subzone;

[0011] determining the target adjustment amount of the ammonia injection valve of the ammonia injection subzone according to the NOx concentration and the O2 concentration corresponding to the ammonia injection subzone;

[0012] controlling the action of the ammonia injection subvalve corresponding to the ammonia injection subzone according to the target adjustment amount.

[0013] Optionally, the determining the target adjustment amount of the ammonia injection valve of the ammonia injection sub-zone according to the NOx concentration and the O2 concentration corresponding to the ammonia injection sub-zone comprises:

[0014] determining a ratio of the NOx concentration and the O2 concentration corresponding to each of the ammonia injection sub-zones;

[0015] determining the target adjustment amount according to an average value of the ratios.

[0016] Optionally, the determining the correction ammonia demand according to the SCR outlet NOx concentration and the preset NOx concentration given value comprises:

[0017] determining the correction ammonia demand corresponding to the current SCR outlet NOx concentration and the NOx concentration given value according to a predetermined correspondence relationship among the predetermined SCR outlet NOx concentration, the preset NOx concentration given value and the correction ammonia demand.

[0018] Optionally, the determining the theoretical ammonia demand according to the SCR inlet NOx concentration and the flue gas amount comprises:

[0019] determining the theoretical ammonia demand by the following formula:

[0020] w = (c e -c p )*L*n

[0021] wherein w is the theoretical ammonia demand, c e is the SCR inlet NOx concentration, c p is the NOx concentration given value, L is the flue gas amount, and n is the ammonia nitrogen molar ratio.

[0022] Optionally, the operation state information comprises at least one of the following state sub-parameters:

[0023] unit load, total air volume, total coal amount, furnace oxygen amount, mill start-stop signal, coal feeder start-stop signal, mill inlet primary air volume, cold and hot primary air damper opening degree, secondary air damper opening degree, ammonia escape concentration, SCR inlet and outlet CEMS operation signal, ammonia injection sub-zone dilution air volume, and instrument measurement signal.

[0024] The second aspect of the present disclosure provides an ammonia injection control device of an SCR denitration device, which comprises:

[0025] a first determining module configured to determine a correction ammonia demand according to an SCR outlet NOx concentration and a preset NOx concentration given value;

[0026] a second determining module configured to determine a theoretical ammonia demand according to an SCR inlet NOx concentration and a flue gas amount;

[0027] a third determining module, configured to determine a feedforward amount according to operation state information of the SCR denitration device;

[0028] a fourth determining module, configured to determine an opening of an ammonia injection total valve according to the theoretical ammonia demand, the corrected ammonia demand, and the feedforward amount, so as to control action of the ammonia injection total valve.

[0029] Optionally, the device further comprises:

[0030] an acquisition module, configured to acquire NOx concentration and O2 concentration corresponding to each ammonia injection subzone;

[0031] a fifth determining module, configured to determine a target adjustment amount of an ammonia injection valve of the ammonia injection subzone according to the NOx concentration and the O2 concentration corresponding to the ammonia injection subzone;

[0032] a control module, configured to control action of an ammonia injection subvalve corresponding to the ammonia injection subzone according to the target adjustment amount.

[0033] Optionally, the fifth determining module comprises:

[0034] a first determining submodule, configured to determine a ratio of the NOx concentration and the O2 concentration corresponding to each ammonia injection subzone;

[0035] a second determining submodule, configured to determine the target adjustment amount according to an average value of the ratio.

[0036] Optionally, the first determining module is configured to determine the corrected ammonia demand in the following manner:

[0037] determine the corrected ammonia demand corresponding to the current SCR outlet NOx concentration and the NOx concentration given value according to a predetermined correspondence relationship among the predetermined SCR outlet NOx concentration, the preset NOx concentration given value, and the corrected ammonia demand.

[0038] Optionally, the second determining module is configured to determine the theoretical ammonia demand in the following formula:

[0039] w = (c e -c p )*L*n

[0040] wherein w is the theoretical ammonia demand, c e is the SCR inlet NOx concentration, c p is the NOx concentration given value, L is the flue gas amount, and n is the ammonia nitrogen molar ratio.

[0041] Optionally, the operation state information comprises at least one of the following state subparameters:

[0042] The unit load, total air volume, total coal volume, furnace oxygen volume, mill start-stop signal, coal feeder start-stop signal, mill inlet primary air volume, cold and hot primary air door opening, secondary air door opening, ammonia escape concentration, SCR inlet and outlet CEMS operation signal, ammonia injection partition dilution air volume, and instrument measurement signal.

[0043] The third aspect of the present disclosure provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method provided in the first aspect of the present disclosure.

[0044] The fourth aspect of the present disclosure provides an electronic device, comprising:

[0045] a memory having a computer program stored thereon;

[0046] a controller, wherein the computer program, when executed by the controller, implements the steps of the method provided in the first aspect of the present disclosure.

[0047] In the above technical solution, the corrected ammonia requirement is determined according to the SCR outlet NOx concentration and a preset NOx concentration given value; the theoretical ammonia requirement is determined according to the SCR inlet NOx concentration and the flue gas volume; the feedforward quantity is determined according to the operation state information of the SCR denitration device; and the opening of the ammonia injection total valve is determined according to the theoretical ammonia requirement, the corrected ammonia requirement, and the feedforward quantity, so as to control the ammonia injection total valve to act. In this way, the deviation of the SCR outlet NOx emission concentration can be reduced, thereby reducing the ammonia escape amount, comprehensively improving the ammonia injection control quality, improving the safety and economy of the unit operation, and also being conducive to better controlling the SCR outlet NOx emission concentration and improving the comprehensive competitiveness of the unit.

[0048] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0049] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0050] Figure 1 is a flowchart of an ammonia injection control method of an SCR denitration device provided by an exemplary embodiment of the present disclosure;

[0051] Figure 2 is a single-unit single-side SCR inlet and outlet NOx / O2 concentration online real-time monitoring system provided by an exemplary embodiment of the present disclosure;

[0052] Figure 3 is a system schematic diagram of a plurality of measurement points sharing one control cabinet provided by an exemplary embodiment of the present disclosure;

[0053] Figure 4 is a block diagram of an ammonia injection control device of an SCR denitration device according to an example embodiment of the present disclosure;

[0054] Figure 5 is a block diagram of an electronic device according to an example embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0056] It should be noted that all actions of obtaining signals, information or data in the present disclosure are performed in compliance with the corresponding data protection regulations and policies of the country where the device is located, and with the authorization of the corresponding device owner.

[0057] Figure 1 is a flowchart of an ammonia injection control method of an SCR denitration device according to an example embodiment of the present disclosure. As shown in Figure 1 , the method can include S101-S104.

[0058] S101, determining a correction ammonia requirement according to an SCR outlet NOx concentration and a preset NOx concentration given value.

[0059] Exemplarily, the SCR outlet NOx concentration can be obtained by a NOx concentration detection device arranged at the SCR outlet, and the NOx concentration given value can be set by a worker according to the actual situation to stabilize the SCR outlet NOx concentration.

[0060] S102, determining a theoretical ammonia requirement according to an SCR inlet NOx concentration and a flue gas amount.

[0061] Exemplarily, the SCR inlet NOx concentration can be obtained by a NOx concentration detection device arranged at the SCR inlet, and the flue gas amount can be obtained by a prearranged flue gas detection device. The NOx concentration detection can be based on a same measurement technology of collecting NOx data by a real-time, multi-point, in-situ installed instrument to ensure the real-time and homogeneity of data collection, fundamentally solve the problem of delay in collecting NOx data, and truly realize intelligent ammonia injection, and the maintenance amount of such instrument is small.

[0062] S103, determining a feedforward amount according to operation state information of the SCR denitration device.

[0063] Exemplarily, the running state information can include mill start-stop signals, cold and hot primary air volume, mill group start-stop signals, coal feeder start-stop signals, and single mill start-stop signals. The mill start-stop signals are faster than the measurement signals (such as the SCR inlet NOx concentration and the SCR outlet NOx concentration), and can be used to realize intelligent feedforward. In the case of receiving the mill start-stop signals, the feedforward amount can be determined according to the cold and hot primary air volume, the mill group start-stop signals, the coal feeder start-stop signals, and the single mill start-stop signals. For example, a feedforward amount determination model can be established in advance according to historical data of the cold and hot primary air volume, the mill group start-stop signals, the coal feeder start-stop signals, and the single mill start-stop signals, and the model is used to determine the feedforward amount of NOx when the mill is started or stopped. In this way, the control adaptability of the SCR outlet NOx concentration can be enhanced, the automatic investment rate of the SCR under low load can be ensured, the fluctuation of the NOx concentration can be reduced, and the stability of the control can be enhanced.

[0064] In S104, the opening degree of the total ammonia injection valve is determined according to the theoretical ammonia demand, the corrected ammonia demand, and the feedforward amount, so as to control the action of the total ammonia injection valve.

[0065] Exemplarily, a cascade denitration control strategy can be adopted, the output value of the main regulation controller is the corrected ammonia demand, the output value (i.e., the corrected ammonia demand) can be obtained according to the SCR outlet NOx concentration and the preset NOx concentration given value, the PID parameters calculated according to the past operation data, and the output value is input into the secondary regulation controller; the secondary regulation controller can determine the theoretical ammonia demand according to the SCR inlet NOx concentration and the flue gas volume, and determine the feedforward amount according to the running state information of the SCR denitration device, so as to obtain the secondary regulation given value according to the corrected ammonia demand, the feedforward amount, and the theoretical ammonia demand, and the secondary regulation given value is the ammonia supply flow regulation signal, which is used to indicate the opening degree of the total ammonia injection valve, so as to control the action of the total ammonia injection valve. In this way, the overall working condition of the SCR region can be predicted and fed back, the dynamic characteristics of the system can be ensured, the influence of the flow characteristics of the field regulation valve on the regulation performance can be eliminated, the dynamic ammonia nitrogen molar ratio control can be realized, and the safe, stable, and economic operation of the denitration system can be ensured. Through the introduction of the feedforward amount, the combustion system inertia can be overcome, the NOx concentration fluctuation can be reduced, the control stability can be enhanced, the NOx concentration exceeding the standard due to fluctuation can be eliminated, the ammonia escape can be reduced, and a large difference between the ammonia injection amount and the actual demand value can be avoided.

[0066] In the technical solution, the ammonia demand is determined according to the SCR outlet NOx concentration and the preset NOx concentration given value; the theoretical ammonia demand is determined according to the SCR inlet NOx concentration and the flue gas amount; the feedforward amount is determined according to the operation state information of the SCR denitration device; and the opening of the ammonia injection total valve is determined according to the theoretical ammonia demand, the corrected ammonia demand and the feedforward amount, so as to control the ammonia injection total valve. In this way, the deviation of the SCR outlet NOx emission concentration can be reduced, the ammonia escape amount can be reduced, the ammonia injection control quality can be improved, the safety and economy of the unit operation can be improved, and the SCR outlet NOx emission concentration can be better controlled, and the comprehensive competitiveness of the unit can be improved.

[0067] Optionally, the ammonia injection control method of the SCR denitration device provided by the present disclosure can further include:

[0068] Obtaining the NOx concentration and the O2 concentration corresponding to each ammonia injection subzone;

[0069] Determining the target adjustment amount of the ammonia injection valve of the ammonia injection subzone according to the NOx concentration and the O2 concentration corresponding to the ammonia injection subzone;

[0070] Controlling the ammonia injection subvalve corresponding to the ammonia injection subzone to act according to the target adjustment amount.

[0071] Exemplarily, Figure 2 The single-unit single-side SCR inlet and outlet NOx / O2 concentration online real-time monitoring system provided by an exemplary embodiment of the present disclosure can adjust the opening of the ammonia injection total valve, and then adjust the ammonia injection amount of each ammonia injection subzone (such as the ammonia injection subzone shown in the dashed box) by adjusting the ammonia injection subvalve arranged on the ammonia injection subzone pipeline corresponding to each ammonia injection subzone, so as to realize the leveling of the ammonia injection amount of each subzone, wherein A is an ammonia injection grid, and B is a reactor. Figure 2 The single-unit single-side SCR inlet and outlet NOx / O2 concentration online real-time monitoring system provided by an exemplary embodiment of the present disclosure can adjust the opening of the ammonia injection total valve, and then adjust the ammonia injection amount of each ammonia injection subzone (such as the ammonia injection subzone shown in the dashed box) by adjusting the ammonia injection subvalve arranged on the ammonia injection subzone pipeline corresponding to each ammonia injection subzone, so as to realize the leveling of the ammonia injection amount of each subzone, wherein A is an ammonia injection grid, and B is a reactor. Figure 3 The single-unit single-side SCR inlet and outlet NOx / O2 concentration online real-time monitoring system provided by an exemplary embodiment of the present disclosure can adjust the opening of the ammonia injection total valve, and then adjust the ammonia injection amount of each ammonia injection subzone (such as the ammonia injection subzone shown in the dashed box) by adjusting the ammonia injection subvalve arranged on the ammonia injection subzone pipeline corresponding to each ammonia injection subzone, so as to realize the leveling of the ammonia injection amount of each subzone, wherein A is an ammonia injection grid, and B is a reactor. Figure 3 As shown in the figure, the single-side SCR outlet flue 1 can be evenly divided into five virtual measurement zones in the width direction, and one field independent sampling measurement and analysis unit is arranged in each measurement zone, which are respectively a first measurement and analysis unit 11, a second measurement and analysis unit 12, a third measurement and analysis unit 13, a fourth measurement and analysis unit 14, and a fifth measurement and analysis unit 15, which are arranged one by one with the ammonia injection subzone to measure the NOx and O2 concentrations of each subzone.

[0072] The target adjustment amount of the ammonia injection valve of the ammonia injection subzone can be determined according to the NOx concentration and the O2 concentration corresponding to the ammonia injection subzone, which can include:

[0073] Determining the ratio of the NOx concentration and the O2 concentration corresponding to each ammonia injection subzone;

[0074] Determining the target adjustment amount according to the average value of the ratio.

[0075] For example, a relationship between the average value and the target adjustment amount corresponding to each ammonia injection subzone can be preset, and thus, according to the average value determined in real time, the target adjustment amount corresponding to each ammonia injection subzone can be determined through the relationship. In this way, by measuring the NOx / O2 concentration of each subzone and determining the ammonia injection deviation adjustment target value of each subzone by means of the average value of the NOx / O2 concentration at the SCR outlet, the accuracy of the determined target adjustment amount can be ensured, and the ammonia injection amount of each subzone can be leveled.

[0076] Optionally, in S101, determining the correction ammonia requirement according to the SCR outlet NOx concentration and the preset NOx concentration given value can include:

[0077] According to a predetermined corresponding relationship among the SCR outlet NOx concentration, the preset NOx concentration given value, and the correction ammonia requirement, the correction ammonia requirement corresponding to the current SCR outlet NOx concentration and the NOx concentration given value is determined.

[0078] For example, the corresponding relationship among the SCR outlet NOx concentration, the preset NOx concentration given value, and the correction ammonia requirement can be pre-calibrated through experiments, and in the case of determining the current SCR outlet NOx concentration and the NOx concentration given value, the corresponding correction ammonia requirement can be determined by looking up the corresponding relationship.

[0079] Optionally, in S102, determining the theoretical ammonia requirement according to the SCR inlet NOx concentration and the flue gas amount can include:

[0080] The theoretical ammonia requirement is determined by the following formula:

[0081] w = (c e -c p )*L*n

[0082] wherein w is the theoretical ammonia requirement, c e is the SCR inlet NOx concentration, c p is the NOx concentration given value, L is the flue gas amount, and n is the ammonia nitrogen molar ratio.

[0083] Optionally, the operating state information includes at least one of the following state sub-parameters:

[0084] The unit load, the total air volume, the total coal amount, the furnace oxygen amount, the mill start-stop signal, the coal feeder start-stop signal, the mill inlet primary air volume, the cold and hot primary air damper opening degree, the secondary air damper opening degree, the ammonia escape concentration, the SCR inlet and outlet CEMS operation signal, the ammonia injection subzone dilution air volume, and the instrument measurement signal.

[0085] Exemplarily, the coal feeder start-stop signal is faster than the measurement signal (such as the SCR inlet NOx concentration and the SCR outlet NOx concentration), which can be used to realize intelligent feedforward. In the case of receiving the coal feeder start-stop signal, the feedforward amount can be determined according to the unit load, total air volume, total coal amount, and furnace oxygen amount, and a feedforward amount determination model can be established according to the historical unit load, total air volume, total coal amount, and furnace oxygen amount to determine the feedforward amount of NOx when the coal mill is started or stopped. In this way, multiple models can be established under different working conditions through the above-mentioned state sub-parameters, which can enhance the control adaptability of the SCR outlet NOx concentration, effectively ensure the automatic input rate of the SCR under low load, reduce the fluctuation of the NOx concentration, and enhance the stability of the control.

[0086] Based on the same inventive concept, the disclosure also provides an ammonia injection control device of an SCR denitration device. Figure 4 is a block diagram of an ammonia injection control device 400 of an SCR denitration device provided by an exemplary embodiment of the disclosure. Referring to Figure 4 The ammonia injection control device 400 of the SCR denitration device can include:

[0087] A first determination module 401 is configured to determine a correction ammonia demand according to the SCR outlet NOx concentration and a preset NOx concentration given value.

[0088] A second determination module 402 is configured to determine a theoretical ammonia demand according to the SCR inlet NOx concentration and the flue gas amount.

[0089] A third determination module 403 is configured to determine a feedforward amount according to the operation state information of the SCR denitration device.

[0090] A fourth determination module 404 is configured to determine the opening degree of the ammonia injection total valve according to the theoretical ammonia demand, the correction ammonia demand, and the feedforward amount, so as to control the action of the ammonia injection total valve.

[0091] In the above technical solution, the correction ammonia demand is determined according to the SCR outlet NOx concentration and the preset NOx concentration given value, the theoretical ammonia demand is determined according to the SCR inlet NOx concentration and the flue gas amount, the feedforward amount is determined according to the operation state information of the SCR denitration device, and the opening degree of the ammonia injection total valve is determined according to the theoretical ammonia demand, the correction ammonia demand, and the feedforward amount, so as to control the action of the ammonia injection total valve. In this way, the deviation of the SCR outlet NOx emission concentration can be reduced, thereby reducing the ammonia escape amount, comprehensively improving the ammonia injection control quality, improving the safety and economy of the unit operation, and being beneficial to better control the SCR outlet NOx emission concentration and improve the comprehensive competitiveness of the unit.

[0092] The device 400 further includes:

[0093] The acquisition module is configured to acquire the NOx concentration and the O2 concentration corresponding to each ammonia injection subzone;

[0094] The fifth determination module is configured to determine a target adjustment amount of an ammonia injection valve of the ammonia injection subzone according to the NOx concentration and the O2 concentration corresponding to the ammonia injection subzone;

[0095] The control module is configured to control the ammonia injection subvalve corresponding to the ammonia injection subzone to act according to the target adjustment amount.

[0096] Optionally, the fifth determination module comprises:

[0097] The first determination submodule is configured to determine a ratio of the NOx concentration and the O2 concentration corresponding to each ammonia injection subzone;

[0098] The second determination submodule is configured to determine the target adjustment amount according to an average value of the ratio.

[0099] Optionally, the first determination module 401 is configured to determine the corrected ammonia demand by:

[0100] According to a predetermined correspondence relationship between the SCR outlet NOx concentration, the preset NOx concentration given value and the corrected ammonia demand, a corrected ammonia demand corresponding to the current SCR outlet NOx concentration and the NOx concentration given value is determined.

[0101] Optionally, the second determination module 402 is configured to determine the theoretical ammonia demand by:

[0102] w = (c e -c p )*L*n

[0103] wherein w is the theoretical ammonia demand, c e is the SCR inlet NOx concentration, c p is the NOx concentration given value, L is the flue gas volume, and n is the ammonia nitrogen molar ratio.

[0104] Optionally, the operation state information comprises at least one of the following state subparameters:

[0105] The unit load, the total air volume, the total coal volume, the furnace oxygen volume, the mill start-stop signal, the coal feeder start-stop signal, the mill inlet primary air volume, the cold and hot primary air door opening degree, the secondary air door opening degree, the ammonia escape concentration, the SCR inlet and outlet CEMS operation signal, the ammonia injection subzone dilution air volume, and the instrument measurement signal.

[0106] As to the apparatus in the above-described embodiments, the specific manners in which various modules perform operations have been described in detail in the embodiments of the method, and thus will not be described herein in detail.

[0107] Figure 5 is a block diagram of an electronic device 700 according to an example embodiment. As shown, the electronic device 700 can include a processor 701, a memory 702. The electronic device 700 can also include one or more of a multimedia component 703, an input / output (I / O) interface 704, and a communication component 705. Figure 5

[0108] ​The processor 701 is configured to control overall operations of the electronic device 700 to complete all or part of the steps of the SCR denitration device ammonia injection control method described above. The memory 702 is configured to store various types of data to support operations of the electronic device 700, which can include, for example, instructions for operating any application or method on the electronic device 700, and application-related data, such as contact data, sent and received messages, pictures, audio, video, and the like. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The multimedia component 703 can include a screen and an audio component. The screen can be, for example, a touch screen, and the audio component is configured to output and / or input audio signals. For example, the audio component can include a microphone configured to receive external audio signals. The received audio signals can be further stored in the memory 702 or transmitted through the communication component 705. The audio component also includes at least one speaker configured to output audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, which can be a keyboard, a mouse, a button, and the like. The buttons can be virtual buttons or physical buttons. The communication component 705 is configured to perform wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, near field communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, and the like, or a combination of one or more of them, is not limited herein. Therefore, the corresponding communication component 705 can include a Wi-Fi module, a Bluetooth module, an NFC module, and the like.

[0109] In an exemplary embodiment, the electronic device 700 can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for performing the ammonia injection control method of the SCR denitration device described above.

[0110] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the ammonia injection control method of the SCR denitration device described above. For example, the computer-readable storage medium can be the memory 702 described above including program instructions, which can be executed by the processor 701 of the electronic device 700 to complete the ammonia injection control method of the SCR denitration device described above.

[0111] In another exemplary embodiment, a computer program product is also provided, which contains a computer program capable of being executed by a programmable device, and the computer program has code portions for executing the ammonia injection control method of the SCR denitration device described above when executed by the programmable device.

[0112] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept range of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0113] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present disclosure.

[0114] In addition, any combination of various different embodiments of the present disclosure can also be made, as long as it does not deviate from the idea of the present disclosure, and it should also be considered as disclosed in the present disclosure.

Claims

1. An ammonia injection control method for an SCR de-NOx device, characterized by, The method comprises: determining a correction ammonia requirement according to the SCR outlet NOx concentration and a preset NOx concentration given value; determining a theoretical ammonia requirement according to the SCR inlet NOx concentration and the flue gas amount; determining a feedforward amount according to the operation state information of the SCR denitration device; determining the opening of the ammonia injection total valve according to the theoretical ammonia requirement, the correction ammonia requirement and the feedforward amount, to control the ammonia injection total valve action; acquiring the NOx concentration corresponding to each ammonia injection sub-zone and concentration; Based on the NOx concentration corresponding to the ammonia injection zone and Concentration, to determine the target adjustment amount of the ammonia injection valve in the ammonia injection zone; controlling the ammonia injection sub-valve action corresponding to the ammonia injection sub-zone according to the target adjustment amount; The target adjustment amount of the ammonia injection valve of the ammonia injection partition is determined according to the NOx concentration corresponding to the ammonia injection partition and the target NOx concentration. The target adjustment amount of the ammonia injection valve of the ammonia injection partition is determined according to the NOx concentration corresponding to the ammonia injection partition and the target NOx concentration. determining the NOx concentration corresponding to each of the ammonia injection zones and a ratio of the concentrations. determining the target adjustment amount according to the average value of the ratio.

2. The method of claim 1, wherein, The determination of the correction ammonia requirement according to the SCR outlet NOx concentration and the preset NOx concentration given value comprises: determining the correction ammonia requirement corresponding to the current SCR outlet NOx concentration and the NOx concentration given value according to the correspondence among the predetermined SCR outlet NOx concentration, the preset NOx concentration given value and the correction ammonia requirement.

3. The method of claim 1, wherein, The determination of the theoretical ammonia requirement according to the SCR inlet NOx concentration and the flue gas amount comprises: determining the theoretical ammonia requirement by the following formula: wherein, is the theoretical ammonia demand, is the SCR inlet NOx concentration, is the NOx concentration given value, is the flue gas amount, n is the ammonia nitrogen molar ratio.

4. The method of claim 1, wherein, The operation state information comprises at least one of the following state sub-parameters: unit load, total air volume, total coal amount, furnace oxygen amount, mill start-stop signal, coal feeder start-stop signal, mill inlet primary air volume, cold and hot primary air damper opening, secondary air damper opening, ammonia escape concentration, SCR inlet and outlet CEMS operation signal, ammonia injection sub-zone dilution air volume, instrument measurement signal.

5. An ammonia injection control device for an SCR de-NOx device, characterized by, The ammonia injection control device comprises: a first determination module for determining a correction ammonia requirement according to the SCR outlet NOx concentration and a preset NOx concentration given value; a second determination module for determining a theoretical ammonia requirement according to the SCR inlet NOx concentration and the flue gas amount; a third determination module for determining a feedforward amount according to the operation state information of the SCR denitration device; a fourth determination module for determining the opening of the ammonia injection total valve according to the theoretical ammonia requirement, the correction ammonia requirement and the feedforward amount, to control the ammonia injection total valve action; The acquisition module is configured to acquire the NOx concentration corresponding to each ammonia injection sub-zone and the ammonia concentration corresponding to each ammonia injection sub-zone. Concentration; The fifth determining module is used to determine the NOx concentration corresponding to the ammonia injection zone and Concentration, to determine the target adjustment amount of the ammonia injection valve in the ammonia injection zone; a control module for controlling the ammonia injection sub-valve action corresponding to the ammonia injection sub-zone according to the target adjustment amount; The fifth determination module comprises: A first determining sub-module is used for determining the ratio of the NOx concentration and the ammonia concentration corresponding to each of the ammonia injection sub-zones. the ratio of the concentration of the NOx and the concentration of the ammonia a second determination sub-module for determining the target adjustment amount according to the average value of the ratio.

6. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the steps of the method of any one of claims 1-4.

7. An electronic device, comprising: comprise: a memory having a computer program stored thereon; a processor for executing the computer program in the memory to implement the steps of the method of any one of claims 1-4.

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