Ammonia injection adjustment system, method, device and medium for SCR denitration based on acoustic wave velocity measurement

Abstract

The present application relates to the SCR denitration ammonia injection adjustment system, method, equipment and medium based on acoustic velocity, including including flue gas flow measurement system and zoning leveling system, the flue gas flow measurement system is connected with the zoning leveling system;Flue gas flow measurement system includes control system, a plurality of ultrasonic sensors, a plurality of ultrasonic generators and a plurality of thermometers, the SCR denitration reactor includes a plurality of reaction zones, for each reaction zone, the reaction zone includes an ultrasonic sensor, an ultrasonic generator and a thermometer, the control system is connected with the ultrasonic sensor, the ultrasonic generator and the thermometer of each reaction zone respectively. The problem that the lag of the measurement result caused by the relatively long sampling pipeline of the CEMS system, which will lead to the poor synchronization of the ammonia injection supply and the actual ammonia demand, is solved.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, and in particular to an SCR denitrification ammonia injection regulation system, method, equipment and medium based on sound wave velocity measurement. Background Technology

[0002] In recent years, in response to national environmental protection requirements, domestic coal-fired power units have generally undergone real-time ultra-low emission retrofitting, with NOx emission concentrations at total discharge outlets controlled at 50 mg / Nm³. 3 Within this context, some regions have even proposed stricter emission requirements. Under these circumstances, some coal-fired power plants, in order to meet environmental protection requirements, often inject excessive amounts of NH3 to ensure that the total discharge outlet meets the standards. However, excessive ammonia not only increases operating costs, but also easily reacts with SO3 in the flue gas to form NH4HSO3 and NH4HSO4. Their deposition can not only cause air preheater blockage and increase system resistance, but also adhere to the catalyst surface, reduce catalyst activity, and affect catalyst life. Furthermore, NH4HSO3 is corrosive and can corrode the flue. Therefore, the existing SCR (Selective Catalytic Reduction) ammonia injection regulation system can no longer meet the needs of flexible unit operation, and many power plants are optimizing or modifying their ammonia injection systems.

[0003] Currently, ammonia injection optimization mainly involves adjusting the inlet ammonia injection valve of the ammonia injection grid through on-site tests to achieve balancing of the outlet NOx emission concentration. However, given the frequent peak shaving of coal-fired power units in China, relying solely on ammonia injection optimization has significant limitations. A more mainstream ammonia injection modification involves dividing the denitrification reactor into zones and installing a CEMS (Continuous Emission Monitoring System) measurement system in each zone to achieve precise ammonia injection. However, due to the long sampling pipeline of the CEMS system, the measurement results are delayed, leading to a poor synchronization between the ammonia supply and the actual ammonia demand. Summary of the Invention

[0004] To overcome the problem of poor synchronization between the ammonia supply and actual ammonia demand caused by the long sampling pipeline of the CEMS system and the resulting lag in measurement results, this invention provides an SCR denitrification ammonia injection regulation system, method, equipment and medium based on acoustic velocimetry.

[0005] In a first aspect, in order to solve the above-mentioned technical problems, the present invention provides an SCR denitrification ammonia injection regulation system based on acoustic velocimetry, including a flue gas flow measurement system and a zone leveling system, wherein the flue gas flow measurement system is connected to the zone leveling system.

[0006] The flue gas flow measurement system includes a control system, multiple ultrasonic sensors, multiple ultrasonic generators, and multiple thermometers. The SCR denitrification reactor includes multiple reaction zones. For each reaction zone, there is one ultrasonic sensor, one ultrasonic generator, and one thermometer. The control system is connected to the ultrasonic sensor, ultrasonic generator, and thermometer of each reaction zone, respectively.

[0007] The ultrasonic sensors corresponding to each reaction zone are located on the same horizontal plane, and the ultrasonic generators corresponding to each reaction zone are located on the same horizontal plane. For each reaction zone, the ultrasonic sensors and ultrasonic generators are set on both sides of the reaction zone, and the line connecting the ultrasonic generators and ultrasonic sensors is perpendicular to the flow direction of the flue gas.

[0008] The control system is used to acquire the reception duration of ultrasonic waves emitted by ultrasonic generators received by ultrasonic sensors in each reaction zone, as well as the temperature of thermometers, and to determine the corresponding flue gas volume for each reaction zone based on the reception duration, temperature, zone area, and preset relationships; wherein, the preset relationships store the correspondence between reception duration and different temperatures and flue gas flow rates.

[0009] The zone leveling system is used to obtain the original total ammonia injection amount, and after normalizing the flue gas volume of each zone, it obtains the flue gas volume ratio of each reaction zone. The original total ammonia injection amount is allocated to each reaction zone according to the flue gas volume ratio to obtain the target zone injection amount for each reaction zone. The original zone ammonia injection amount of each reaction zone is then adjusted to the corresponding target zone ammonia injection amount for ammonia injection.

[0010] Secondly, this invention provides a method for regulating ammonia injection in SCR denitrification based on acoustic velocimetry, the method comprising:

[0011] The reception duration of ultrasonic waves emitted by the ultrasonic generator received by the ultrasonic sensor in each reaction zone, as well as the temperature of the thermometer, are obtained, and the corresponding flue gas volume for each reaction zone is determined based on the reception duration and temperature.

[0012] The original total ammonia injection amount is obtained, and after normalization based on the flue gas volume of each zone, the flue gas volume ratio of each reaction zone is obtained. The original total ammonia injection amount is allocated to each reaction zone according to the flue gas volume ratio to obtain the target zone injection amount for each reaction zone. The original zone ammonia injection amount of each reaction zone is then adjusted to the corresponding target zone ammonia injection amount for ammonia injection.

[0013] Thirdly, the present invention also provides an apparatus, including a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor executes the program to implement the steps of the SCR denitrification ammonia injection adjustment method based on acoustic velocimetry as described above.

[0014] Fourthly, the present invention also provides a computer-readable storage medium storing instructions that, when executed on a terminal device, cause the terminal device to perform the steps of the SCR denitrification ammonia injection adjustment method based on acoustic velocimetry.

[0015] The beneficial effects of the SCR denitrification ammonia injection regulation system based on acoustic velocimetry provided by this invention are as follows: When flue gas is introduced into the SCR denitrification reactor, the larger the amount of ammonia injected into each zone, the stronger the interference to the ultrasonic waves emitted by the ultrasonic generator. Therefore, by measuring the reception time, temperature, zone area, and preset relationship of the ultrasonic waves emitted by the ultrasonic generator to the ultrasonic sensor, the amount of flue gas in each zone can be quickly determined. The result is rapid, and after normalization of the flue gas amount in each zone, the proportion of flue gas amount corresponding to each reaction zone is obtained. The original total ammonia injection amount is redistributed to determine the target ammonia injection amount for each reaction zone, thereby achieving rapid synchronization between the actual demand (target zone ammonia injection amount) and the supply (original zone ammonia injection amount) of each reaction zone. This solves the problem that the measurement results are delayed due to the long sampling pipeline of the CEMS system, which leads to poor synchronization between the supply and actual demand of ammonia. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the SCR denitrification ammonia injection regulation system based on acoustic velocimetry according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the reaction zone structure;

[0019] Figure 3 A schematic diagram showing the connection between the ammonia injection total volume system, the flue gas flow measurement system, and the zone leveling system;

[0020] Figure 4 This is a schematic flowchart of the SCR denitrification ammonia injection adjustment method based on acoustic velocimetry according to an embodiment of the present invention. Detailed Implementation

[0021] The following embodiments are further explanations and supplements to the present invention and do not constitute any limitation on the present invention.

[0022] The following describes, with reference to the accompanying drawings, an SCR denitrification ammonia injection regulation system, method, equipment, and medium based on acoustic velocimetry according to embodiments of the present invention.

[0023] like Figure 1As shown, this embodiment of the invention provides an SCR denitrification ammonia injection regulation system based on acoustic velocimetry, including a flue gas flow measurement system and a zone leveling system, wherein the flue gas flow measurement system is connected to the zone leveling system.

[0024] The flue gas flow measurement system includes a control system, multiple ultrasonic sensors, multiple ultrasonic generators, and multiple thermometers. The SCR denitrification reactor includes multiple reaction zones. For each reaction zone, such as... Figure 2 As shown, each reaction zone includes an ultrasonic sensor, an ultrasonic generator, and a thermometer. The control system is connected to the ultrasonic sensor, ultrasonic generator, and thermometer of each reaction zone, respectively.

[0025] The ultrasonic sensors for each reaction zone are located on the same horizontal plane, and the ultrasonic generators for each reaction zone are located on the same horizontal plane. For each reaction zone, the ultrasonic sensors and ultrasonic generators are set on both sides of the reaction zone, and the line connecting the ultrasonic generators and ultrasonic sensors is perpendicular to the flow direction of the flue gas.

[0026] When installing the ultrasonic generator and ultrasonic sensor, their center points must be aligned. The line connecting the center points of the ultrasonic generator and the ultrasonic sensor must be perpendicular to the direction of the flue gas. Because the flue gas contains a high amount of dust, the surface of the ultrasonic generator and ultrasonic sensor may be affected by dust, which may affect the emission and reception of sound waves. Therefore, it is necessary to blow clean air onto the surface of the sensor to keep it clean.

[0027] The control system is used to acquire the reception duration of ultrasonic waves emitted by ultrasonic generators received by ultrasonic sensors in each reaction zone, as well as the temperature of thermometers, and to determine the corresponding flue gas volume for each reaction zone based on the reception duration, temperature, zone area, and preset relationships; wherein, the preset relationships store the correspondence between reception duration and different temperatures and flue gas flow rates.

[0028] The distance between the ultrasonic sensor and the ultrasonic generator is fixed. Therefore, when there is no flue gas flow between them to interfere with the ultrasonic waves, the reception time of the ultrasonic sensor is a constant. When there is flue gas flow between them, it will interfere with the ultrasonic waves emitted by the ultrasonic generator. As a result, the reception time of the ultrasonic sensor will be extended, and the greater the flue gas velocity (the greater the amount of ammonia injected in a zone, the greater the flue gas velocity, and vice versa), the greater the interference. Finally, the amount of flue gas in a zone can be determined by the reception time of the ultrasonic waves received by the ultrasonic sensor, the temperature, the zone area, and the preset relationship.

[0029] The zone leveling system is used to obtain the original total ammonia injection amount, and after normalizing the flue gas volume of each zone, it obtains the flue gas volume ratio of each reaction zone. The original total ammonia injection amount is allocated to each reaction zone according to the flue gas volume ratio to obtain the target zone injection amount for each reaction zone. The original zone ammonia injection amount of each reaction zone is then adjusted to the corresponding target zone ammonia injection amount for ammonia injection.

[0030] For example, if the flue gas volume in reaction zone a is measured to be 10% of the total flue gas volume by the flue gas measurement system, then 10% of the original total ammonia injection volume will be allocated to reaction zone a.

[0031] In this embodiment, when flue gas is introduced into the SCR denitrification reactor, the larger the amount of ammonia injected into each zone, the stronger the interference to the ultrasonic waves emitted by the ultrasonic generator. Therefore, by using the ultrasonic wave emitted by the ultrasonic generator to reach the ultrasonic sensor, the reception time, temperature, zone area, and preset relationship, the amount of flue gas in each zone can be quickly determined. The result is rapid, and after normalization of the flue gas amount in each zone, the proportion of flue gas amount corresponding to each reaction zone is obtained. The original total ammonia injection amount is then redistributed to determine the target ammonia injection amount for each reaction zone. This achieves rapid synchronization between the actual demand (target ammonia injection amount) and the supply (original ammonia injection amount) of each reaction zone. This solves the problem that the measurement results are delayed due to the long sampling pipeline of the CEMS system, which leads to poor synchronization between the ammonia supply and the actual ammonia demand.

[0032] Optionally, the control system is specifically used to: acquire a preset database containing preset relationships; determine the flue gas velocity corresponding to each reaction zone based on the preset relationships, reception duration, and temperature; acquire the zone area of ​​each reaction zone, and determine the zone flue gas volume of each reaction zone based on the zone area and flue gas velocity.

[0033] The ultrasonic generator emits ultrasonic signals, and the ultrasonic sensor receives ultrasonic signals, which are then fed back to the control system. By using the ultrasonic sensor to receive the ultrasonic reception duration and the thermometer temperature, the corresponding flue gas velocity can be quickly retrieved from the database. This fast response time and low latency improve the synchronization between the actual demand and supply of the reaction zone.

[0034] The formula for obtaining the flue gas volume by zone is: Flue gas volume by zone = Flue gas velocity * Zone area.

[0035] Optionally, the control system is specifically used to: starting from the first reaction zone and continuing until the last reaction zone, after obtaining the flue gas volume corresponding to the current reaction zone, control the corresponding ultrasonic generator and ultrasonic sensor to turn off, turn on the ultrasonic generator and ultrasonic sensor corresponding to the next reaction zone, and obtain the corresponding flue gas volume. After obtaining the flue gas volume of all reaction zones, wait for the next time to obtain the flue gas volume of all reaction zones.

[0036] Each reaction zone is equipped with an ultrasonic generator and an ultrasonic sensor. To avoid the interaction of ultrasonic waves between different reaction zones, the flue gas volume of each zone is obtained by a round-robin method. A round-robin test means that the ultrasonic generator of the first reaction zone emits an ultrasonic wave, the ultrasonic sensor of the first reaction zone receives the sound wave, and obtains the flue gas volume of the corresponding reaction zone. Then, the ultrasonic generator and ultrasonic sensor of the first reaction zone are turned off, the ultrasonic generator and ultrasonic sensor of the second reaction zone are turned on, and the flue gas volume of the second reaction zone is obtained. This process continues until the flue gas volume of the last reaction zone is obtained, which constitutes one round-robin test. A preset time can be set between two adjacent round-robin tests, that is, a round-robin test is performed every preset time.

[0037] Optionally, the zone leveling system is also used to: obtain the measured value of NOx concentration at the outlet of the SCR denitrification reactor and the actual ammonia injection amount of each zone; correct the target ammonia injection amount of each reaction zone based on the measured value of NOx concentration and the actual ammonia injection amount of each zone, determine the corrected ammonia injection amount of each zone, and inject ammonia according to the corrected ammonia injection amount of each zone.

[0038] Although the original ammonia injection rate for each reaction zone is adjusted to the target ammonia injection rate, the actual ammonia injection rate may not reach the target ammonia injection rate due to factors such as prolonged valve operation or aging in the reaction zones. Therefore, it is necessary to obtain the measured NOx (ammonia oxide) concentration at the outlet of the SCR denitrification reactor and the actual ammonia injection rate for each zone. The target ammonia injection rate for each zone is then corrected based on the measured NOx concentration and the actual ammonia injection rate for each zone, thus determining the corrected ammonia injection rate for each zone.

[0039] The zone leveling system is specifically used to: adjust the main and secondary regulating valves of each reaction zone based on the measured NOx concentration and the actual ammonia injection amount in each zone, using a neural network automatic control algorithm, to determine the corrected ammonia injection amount for each zone.

[0040] The main and secondary control valves of each reaction zone are directly adjusted using a neural network automatic control algorithm, resulting in higher intelligence and more precise control.

[0041] Optionally, such as Figure 3As shown, the system also includes an ammonia injection total quantity system, which is connected to the flue gas flow measurement system and the zone leveling system respectively. The ammonia injection total quantity system is specifically used for: obtaining the predicted total ammonia injection quantity; correcting the predicted total ammonia injection quantity to determine the corrected total ammonia injection quantity; and using the corrected total ammonia injection quantity as the original total ammonia injection quantity.

[0042] The original total ammonia injection amount comes from the total ammonia injection system. Therefore, the total ammonia injection system needs to provide a sufficient amount of ammonia injection (predicted total ammonia injection amount) to ensure that each reaction zone has enough ammonia injection amount. In addition, in order to ensure that the NOx at the desulfurization total discharge outlet meets the standard, the predicted total ammonia injection amount also needs to be corrected based on the measured value of the NOx concentration at the desulfurization total discharge outlet to determine the corrected total ammonia injection amount.

[0043] Optionally, the ammonia injection total quantity system is specifically used for: acquiring real-time online data of boiler load, primary and secondary air volume, number of coal mill starts and stops, excess air coefficient, coal feed rate, furnace temperature, and furnace negative pressure from the power plant's DCS (Distributed Control System); using a combination of one or more algorithms, such as big data intelligent control algorithm, support vector regression algorithm, least squares support vector machine algorithm, or artificial neural network model, to predict the predicted NOx concentration value at the desulfurization total discharge outlet; determining the total amount of NOx to be removed based on the predicted NOx concentration value at the desulfurization total discharge outlet, the NOx setpoint at the desulfurization total discharge outlet, and the total flue gas volume at the desulfurization total discharge outlet; determining the predicted total ammonia injection quantity based on the ammonia molar ratio according to the required total NOx to be removed; and correcting the predicted total ammonia injection quantity based on the measured NOx concentration at the desulfurization total discharge outlet.

[0044] The formula for the total amount of NOx to be removed is: Total amount of NOx to be removed = (Predicted NOx value at the inlet of the desulfurization main outlet - Set NOx value at the outlet of the desulfurization main outlet) * Total amount of flue gas at the inlet of the desulfurization main outlet.

[0045] like Figure 4 As shown, this embodiment of the invention also provides a method for adjusting ammonia injection in SCR denitrification based on acoustic velocimetry, including the following steps:

[0046] S1. Obtain the reception duration of the ultrasonic waves emitted by the ultrasonic generator received by the ultrasonic sensor in each reaction zone, as well as the temperature of the thermometer, and determine the amount of flue gas in each reaction zone based on the reception duration and temperature.

[0047] S2. Obtain the original total ammonia injection amount, and after normalizing the flue gas volume of each zone, obtain the flue gas volume ratio corresponding to each reaction zone. Allocate the original total ammonia injection amount to each reaction zone according to the flue gas volume ratio to obtain the target zone injection amount corresponding to each reaction zone. Adjust the original zone ammonia injection amount of each reaction zone to the corresponding target zone ammonia injection amount for ammonia injection.

[0048] Optionally, the ammonia injection rate for each reaction zone is determined based on the receiving time and temperature, including:

[0049] Get preset relationships;

[0050] The flue gas velocity corresponding to each reaction zone is determined based on the preset relationship, receiving time, and temperature.

[0051] Obtain the area of ​​each reaction zone, and determine the amount of ammonia injected into each reaction zone based on the area and flue gas velocity.

[0052] Optionally, the method further includes:

[0053] Starting from the first reaction zone and continuing until the last reaction zone, after obtaining the flue gas volume corresponding to the current reaction zone, the corresponding ultrasonic generator and ultrasonic sensor are turned off, and the ultrasonic generator and ultrasonic sensor corresponding to the next reaction zone are turned on, and the corresponding flue gas volume is obtained. After obtaining the flue gas volume of all reaction zones, wait for the next time to obtain the flue gas volume of all reaction zones.

[0054] Optionally, the method further includes:

[0055] Obtain the measured NOx concentration at the outlet of the SCR denitrification reactor and the actual ammonia injection rate for each zone;

[0056] Based on the measured NOx concentration and the actual ammonia injection amount in each zone, the target ammonia injection amount for each reaction zone is corrected, the corrected ammonia injection amount for each zone is determined, and ammonia is injected according to the corrected ammonia injection amount for each zone.

[0057] Optionally, based on the measured NOx concentration and the actual ammonia injection rate in each zone, the target ammonia injection rate for each reaction zone is corrected to determine the corrected ammonia injection rate, including:

[0058] Based on the measured NOx concentration and the actual ammonia injection rate in each zone, a neural network automatic control algorithm is used to adjust the main and secondary control valves of each reaction zone to determine the corrected ammonia injection rate for each zone.

[0059] Optionally, the method further includes:

[0060] Obtain the predicted total ammonia injection volume;

[0061] The predicted total ammonia injection amount is corrected to determine the corrected total ammonia injection amount.

[0062] The corrected total ammonia injection amount is used as the original total ammonia injection amount.

[0063] Optionally, the predicted total ammonia injection is obtained, and the predicted total ammonia injection is corrected to determine the corrected total ammonia injection, including:

[0064] Acquire real-time online data from the power plant's DCS terminal, including boiler load, primary and secondary air volume, number of coal mills started and stopped, excess air coefficient, coal feed rate, furnace temperature, and furnace negative pressure.

[0065] The predicted NOx concentration at the desulfurization total discharge outlet is obtained by using one or more of the following algorithms: big data intelligent control algorithm, support vector regression algorithm, least squares support vector machine algorithm, or artificial neural network model.

[0066] The total amount of NOx to be removed is determined based on the predicted NOx concentration at the inlet of the desulfurization main outlet, the set value of NOx at the outlet of the desulfurization main outlet, and the total amount of flue gas at the inlet of the desulfurization main outlet.

[0067] The total amount of ammonia to be injected is determined by the ammonia-ammonia molar ratio based on the required total amount of NOx to be removed.

[0068] The predicted total ammonia injection amount is corrected based on the measured NOx concentration at the desulfurization total discharge outlet.

[0069] An embodiment of the present invention includes a memory, a processor, and a program stored in the memory and running on the processor. When the processor executes the program, it implements some or all of the steps of the above-described SCR denitrification ammonia injection adjustment method based on acoustic velocimetry.

[0070] The device can be a computer, and the corresponding program is computer software. The parameters and steps in the device of the present invention can be referred to the parameters and steps in the embodiment of the SCR denitrification ammonia injection adjustment method based on acoustic velocimetry above, and will not be repeated here.

[0071] Those skilled in the art will recognize that this invention can be implemented as a system, method, or computer program product. Therefore, this disclosure can be embodied in the following forms: it can be entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software, generally referred to herein as a "circuit," "module," or "system." Furthermore, in some embodiments, the invention can also be implemented as a computer program product contained in one or more computer-readable media, which contains computer-readable program code. Computer-readable storage media can be, for example, but not limited to—electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An SCR denitrification ammonia injection regulation system based on acoustic velocimetry, characterized in that, It includes a flue gas flow measurement system and a zone leveling system, wherein the flue gas flow measurement system is connected to the zone leveling system; The flue gas flow measurement system includes a control system, multiple ultrasonic sensors, multiple ultrasonic generators, and multiple thermometers. The SCR denitrification reactor includes multiple reaction zones. For each reaction zone, the reaction zone includes one ultrasonic sensor, one ultrasonic generator, and one thermometer. The control system is connected to the ultrasonic sensor, ultrasonic generator, and thermometer of each reaction zone, respectively. The ultrasonic sensors corresponding to each reaction zone are located on the same horizontal plane, and the ultrasonic generators corresponding to each reaction zone are located on the same horizontal plane. For each reaction zone, the ultrasonic sensors and the ultrasonic generators are arranged on both sides of the reaction zone, and the line connecting the ultrasonic generators and the ultrasonic sensors is perpendicular to the flow direction of the flue gas. The control system is used to acquire the reception duration of the ultrasonic waves emitted by the ultrasonic generator received by the ultrasonic sensor in each reaction zone, as well as the temperature of the thermometer, and to determine the flue gas volume corresponding to each reaction zone based on the reception duration, the temperature, the zone area, and a preset relationship; wherein, the preset relationship stores the correspondence between the reception duration and different temperatures and flue gas flow rates. The partition leveling system is used to obtain the original total ammonia injection amount, and after normalizing the flue gas amount of each partition, obtain the flue gas amount ratio corresponding to each reaction partition. The original total ammonia injection amount is allocated to each reaction partition according to the flue gas amount ratio to obtain the target partition injection amount corresponding to each reaction partition. The original partition ammonia injection amount of each reaction partition is adjusted to the corresponding target partition ammonia injection amount for ammonia injection. Specifically, the control system is used for: Starting from the first reaction zone and continuing until the last reaction zone, after obtaining the flue gas volume corresponding to the current reaction zone, the corresponding ultrasonic generator and ultrasonic sensor are turned off, and the ultrasonic generator and ultrasonic sensor corresponding to the next reaction zone are turned on, and the corresponding flue gas volume is obtained. After obtaining the flue gas volume of all reaction zones, wait for the next time to obtain the flue gas volume of all reaction zones.

2. The system according to claim 1, characterized in that, The control system is specifically used for: Obtain a preset database, wherein the preset database stores the preset relationships; The flue gas velocity corresponding to each reaction zone is determined based on the preset relationship, the receiving time, and the temperature. Obtain the area of ​​each reaction zone, and determine the amount of flue gas in each reaction zone based on the area and the flue gas velocity.

3. The system according to claim 1, characterized in that, The zoning leveling system is also used for: Obtain NO from the outlet of the SCR denitrification reactor x Measured concentration value and actual ammonia injection volume in each zone; According to the NO x The measured concentration value and the actual ammonia injection amount for each zone are used to correct the target ammonia injection amount for each reaction zone, determine the corrected ammonia injection amount for each zone, and then inject ammonia according to the corrected ammonia injection amount for each zone.

4. The system according to claim 3, characterized in that, The zoning leveling system is specifically used for: According to the NO x The measured concentration and the actual ammonia injection rate in each zone are used to adjust the main and secondary regulating valves of each reaction zone using a neural network automatic control algorithm to determine the corrected ammonia injection rate for each zone.

5. The system according to any one of claims 1-4, characterized in that, The system also includes an ammonia injection total control system, which is connected to both the flue gas flow measurement system and the zone leveling system. The ammonia injection total control system is specifically used for: Obtain the predicted total ammonia injection volume; The predicted total ammonia injection amount is corrected to determine the corrected total ammonia injection amount; The corrected total ammonia injection amount is taken as the original total ammonia injection amount.

6. The system according to claim 5, characterized in that, The ammonia injection total volume system is specifically used for: Acquire real-time online data from the power plant's DCS terminal, including boiler load, primary and secondary air volume, number of coal mills started and stopped, excess air coefficient, coal feed rate, furnace temperature, and furnace negative pressure. The predicted NO at the desulfurization total discharge outlet is obtained by using one or more of the following algorithms: big data intelligent control algorithm, support vector regression algorithm, least squares support vector machine algorithm, or artificial neural network model. x Concentration value; According to the predicted NO at the desulfurization total discharge outlet x Concentration value, NO at the desulfurization total discharge outlet x Based on the setpoint and the total flue gas volume at the desulfurization outlet inlet, determine the NO that needs to be removed. x Total amount; NO removed as needed x The total amount is determined by the ammonia-nitrogen molar ratio to predict the total amount of ammonia to be injected. According to the NO at the desulfurization total discharge outlet x The actual concentration value is used to correct the predicted total ammonia injection amount to determine the corrected total ammonia injection amount.

7. A method for regulating ammonia injection in SCR denitrification based on acoustic velocimetry, characterized in that, The method utilizes the SCR denitrification ammonia injection regulation system based on acoustic velocimetry as described in any one of claims 1 to 6, comprising: The reception duration of the ultrasonic sensor receiving the ultrasonic wave emitted by the ultrasonic generator in each reaction zone, and the temperature of the thermometer are obtained, and the zone flue gas volume corresponding to each reaction zone is determined based on the reception duration and the temperature. The original total ammonia injection amount is obtained, and after normalization processing based on the flue gas volume of each zone, the flue gas volume ratio corresponding to each reaction zone is obtained. The original total ammonia injection amount is allocated to each reaction zone according to the flue gas volume ratio to obtain the target zone injection amount corresponding to each reaction zone. The original zone ammonia injection amount of each reaction zone is adjusted to the corresponding target zone ammonia injection amount for ammonia injection.

8. A control device, comprising a memory, a processor, and a program stored in the memory and running on the processor, characterized in that, When the processor executes the program, it implements the steps of the SCR denitrification ammonia injection adjustment method based on acoustic velocimetry as described in claim 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on a terminal device, cause the terminal device to perform the steps of the SCR denitrification ammonia injection adjustment method based on acoustic velocimetry as described in claim 7.

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