Gas turbine partitioned ammonia injection control method and system based on urea direct injection pyrolysis

Abstract

The embodiment of the invention provides a gas turbine partitioned ammonia injection control method and system based on urea direct injection pyrolysis, and the method comprises the steps: building a geometric model of a transition flue, and dividing the geometric model into a plurality of independent partitions; an independent spray gun, an independent urea metering module and an independent dilution water-atomized air distribution module are arranged in each independent subarea, and flue gas continuous emission monitoring points are correspondingly arranged; performing flow field simulation on urea solution spraying in each independent partition, and determining urea spraying points and ammonia concentration uniformity of a spray gun in each independent partition; calculating a nitrogen oxide concentration average value of all the independent partitions, comparing the nitrogen oxide concentration average value with a preset nitrogen oxide control target value, and dynamically correcting the opening degree of a urea solution total adjusting valve in the urea metering module; and comparing the measured value of the nitrogen oxide concentration of each independent subarea collected in real time with the corresponding average value of the nitrogen oxide concentration, and independently adjusting the spray gun adjusting valve of each independent subarea according to the deviation value.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of flue gas denitrification based on urea direct injection pyrolysis, and specifically relate to a gas turbine zoned ammonia injection control method and system based on urea direct injection pyrolysis. Background Art

[0002] Nitrogen oxides (NOx) are one of the primary pollutants released by gas turbines, posing a serious threat to the human environment. With the release of the latest atmospheric pollutant emission targets across various industries, gas turbines must more strictly and effectively control NOx emissions from flue gas. Currently, most gas turbines utilize selective catalytic reduction (SCR) denitrification technology, with the reductant preparation process primarily focusing on urea pyrolysis to produce ammonia. Before reaching the minimum ammonia injection temperature for the catalyst, the flue gas temperature in the gas outlet transition duct remains stable above 400°C, reaching the temperature required for urea pyrolysis. Urea direct injection pyrolysis in the gas outlet flue injects a urea solution into the turbine outlet transition flue, utilizing the heat from the flue gas to pyrolyze the urea solution and produce the reductant required for the SCR denitrification reaction. Compared to traditional pyrolysis processes, this method offers the advantages of low construction costs, low energy consumption, and a simple system.

[0003] Currently, CEMS instruments at the outlet of gas turbine denitrification devices mostly adopt a single-point sampling measurement method, and the flue size is large. Single-point measurement cannot truly reflect the NOx concentration distribution and ammonia escape in the outlet flue cross section, resulting in waste of reducing agent and increased ammonia escape. At the same time, the spray guns in the transition flue layout adopt a unified ammonia spray flow control, which cannot achieve precise ammonia spraying.

[0004] Therefore, how to solve the above problems has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a method and system for controlling zoned ammonia injection of a combustion engine based on urea direct injection pyrolysis.

[0006] A first aspect of an embodiment of the present disclosure provides a method for controlling zoned ammonia injection of a gas turbine based on urea direct injection pyrolysis, comprising: establishing a three-dimensional geometric model of a transition flue at a gas turbine outlet, and dividing the flue into a plurality of independent zones based on the flue shape and size;

[0007] An independent spray gun, urea metering module, and dilution water-atomizing air distribution module are installed in each independent partition, and a continuous flue gas emission monitoring point is set at the outlet of the selective catalytic reduction denitrification equipment corresponding to each independent partition;

[0008] Conduct flow field simulation for urea solution injection in each independent zone to determine the urea injection point and ammonia concentration uniformity of the spray gun in each independent zone;

[0009] Calculating the average nitrogen oxide concentration of all independent partitions, comparing the average nitrogen oxide concentration with a preset nitrogen oxide control target value, and dynamically correcting the opening of the urea solution main control valve in the urea metering module;

[0010] The real-time collected nitrogen oxide concentration measurement values of each independent partition are compared with the corresponding average nitrogen oxide concentration values, and the spray gun regulating valve of each independent partition is independently adjusted according to the deviation value.

[0011] Optionally, before calculating the average nitrogen oxide concentration of all independent partitions and comparing the average nitrogen oxide concentration with a preset nitrogen oxide control target value, and dynamically correcting the opening of the urea solution main regulating valve in the urea metering module, the method further includes:

[0012] The nitrogen oxide concentration, oxygen concentration and flue gas volume flow rate in the flue gas are measured in real time at the inlet flue of the selective catalytic reduction denitrification equipment, and the total ammonia injection demand value is calculated;

[0013] The opening of the urea solution main regulating valve in the metering module is adjusted according to the total ammonia injection demand value.

[0014] Optionally, the nitrogen oxide concentration measurement value of each independent partition is obtained in real time through the flue gas continuous emission monitoring measurement point corresponding to each independent partition.

[0015] Optionally, after comparing the real-time collected nitrogen oxide concentration measurement values of each independent zone with the corresponding average nitrogen oxide concentration value, and independently adjusting the spray gun regulating valve of each independent zone according to the deviation value, the method further includes:

[0016] The dilution water flow and atomizing air pressure of each independent zone spray gun are adjusted through the dilution water-atomizing air distribution module.

[0017] Optionally, dividing the flue into multiple independent partitions based on the shape and size includes: dividing the flue into independent partitions with fan-shaped cross-sections according to the center and radius of the circular cross-section flue.

[0018] Optionally, determining the urea injection point of the spray gun in each independent partition includes:

[0019] With the center of the circular flue as the center and the flue radius as the side length, an n×n square grid is divided on the independent partition;

[0020] The urea injection point located in the independent sector partition is determined according to the coincidence relationship between the straight line connecting the vertices of the independent sector partition and each grid vertex, and the coincidence relationship between the grid vertices.

[0021] Furthermore, the method further includes: determining a vertex closest to the center of the circle based on the coincidence relationship between the vertices of each grid, and moving the vertex downward by a preset distance as a urea injection point.

[0022] Optionally, based on the result that the relative standard deviation of the uniformity of the ammonia concentration distribution determined by simulation is greater than a set value, the method further includes: dividing the sector-shaped independent partition into an m×m square grid with the center of the circular flue as the center and the flue radius as the side length, where m>n;

[0023] Determine the urea injection point located in the independent sector partition according to the coincidence relationship between the straight line connecting the vertices of the independent sector partition and each grid vertex, and the coincidence relationship between the grid vertices;

[0024] The flow field simulation of the urea solution injection in each independent partition is performed until the uniformity of the ammonia concentration in each independent partition reaches the preset standard.

[0025] A second aspect of the embodiments of the present disclosure provides a gas engine zoned ammonia injection control system based on urea direct injection pyrolysis, wherein the control system can implement the above-mentioned gas engine zoned ammonia injection control method based on urea direct injection pyrolysis.

[0026] According to a third aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored.

[0027] When the computer program is executed by a processor, it can implement the above-mentioned combustion engine partitioned ammonia injection control method based on urea direct injection pyrolysis.

[0028] The beneficial effects of the embodiments of the present disclosure include:

[0029] In the present invention, each independent partition adopts an independent urea metering module, dilution water-atomizing air distribution module and spray gun to independently control the amount of urea sprayed into the flue. According to the measurement value of the continuous emission monitoring point (CEMS) of the flue gas in each independent partition at the outlet of the selective catalytic reduction denitrification equipment (SCR), the urea amount of the spray gun is adjusted by feedback, thereby achieving precise ammonia spray control for denitrification. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a flow chart of a method for controlling zoned ammonia injection of a combustion engine based on urea direct injection and pyrolysis according to an embodiment of the present disclosure;

[0031] Figure 2 A schematic diagram of independent partitions of a transition flue according to an embodiment of the present disclosure;

[0032] Figure 3 A schematic block diagram of the composition of independent partitions of a transition flue according to another embodiment of the present disclosure;

[0033] Figure 4 This is a structural schematic diagram of a method for controlling zoned ammonia injection of a combustion engine based on urea direct injection and pyrolysis according to an embodiment of the present disclosure;

[0034] Figure 5 This is a schematic structural diagram of a method for controlling zoned ammonia injection of a combustion engine based on urea direct injection and pyrolysis according to another embodiment of the present disclosure;

[0035] Figure 6 for Figure 5 Partially enlarged structural diagram;

[0036] Figure 7 for Figure 5 Schematic diagram of a partially enlarged structure. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0038] The following is a further detailed description of the embodiments of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to illustrate the principles of the present application, but are not used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not perpendicular in the strict sense, but is within the allowable error range. "Parallel" is not parallel in the strict sense, but is within the allowable error range.

[0039] It should also be noted that, in the description of this application, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0040] like Figure 1 As shown, a method for controlling ammonia injection in a combustion engine partition based on urea direct injection pyrolysis includes:

[0041] S101. Establish a three-dimensional geometric model of the turbine outlet transition flue, and divide the flue into multiple independent partitions based on the flue shape and size.

[0042] S102. An independent spray gun, a urea metering module, and a dilution water-atomizing air distribution module are set in each independent partition, and a continuous flue gas emission monitoring point is set at the outlet of the selective catalytic reduction denitrification equipment corresponding to each independent partition.

[0043] S103 , performing flow field simulation on the urea solution injection in each independent partition to determine the urea injection point and ammonia concentration uniformity of the spray gun in each independent partition.

[0044] S104: Calculate the average nitrogen oxide concentration of all independent partitions, compare the average nitrogen oxide concentration with a preset nitrogen oxide control target value, and dynamically correct the opening of the urea solution main regulating valve in the urea metering module.

[0045] S105 , comparing the real-time measured values of the nitrogen oxide concentration of each independent partition with the corresponding average value of the nitrogen oxide concentration, and independently adjusting the spray gun regulating valve of each independent partition according to the deviation value.

[0046] In the present invention, each independent partition adopts an independent urea metering module, dilution water-atomizing air distribution module and spray gun to independently control the amount of urea sprayed into the flue. According to the measurement value of the continuous emission monitoring point (CEMS) of the flue gas in each independent partition at the outlet of the selective catalytic reduction denitrification equipment (SCR), the urea amount of the spray gun is adjusted by feedback, thereby achieving precise ammonia spray control for denitrification.

[0047] In some embodiments, before calculating the average nitrogen oxide concentration of all independent partitions in step S104 and comparing the average nitrogen oxide concentration with a preset nitrogen oxide control target value, and dynamically correcting the opening of the urea solution main regulating valve in the urea metering module, the method further includes:

[0048] The nitrogen oxide concentration, oxygen concentration and flue gas volume flow rate in the flue gas are measured in real time at the inlet flue of the selective catalytic reduction denitrification equipment, and the total ammonia injection demand value is calculated.

[0049] The opening of the urea solution main regulating valve in the metering module is adjusted according to the total ammonia injection demand value.

[0050] In some embodiments, the nitrogen oxide concentration measurement value of each independent partition is obtained in real time through the flue gas continuous emission monitoring measurement point corresponding to each independent partition.

[0051] In some embodiments, after comparing the real-time collected nitrogen oxide concentration measurement values of each independent zone with the corresponding average nitrogen oxide concentration in step S105 and independently adjusting the spray gun regulating valve of each independent zone according to the deviation value, the method further includes:

[0052] The dilution water flow and atomizing air pressure of each independent zone spray gun are adjusted through the dilution water-atomizing air distribution module.

[0053] In some embodiments, dividing the flue into multiple independent partitions based on the shape and size includes: dividing the flue into independent partitions with fan-shaped cross-sections according to the center and radius of the circular cross-section flue.

[0054] In some embodiments, determining the urea injection point of the spray gun in each independent zone includes:

[0055] With the center of the circular flue as the center and the flue radius as the side length, an n×n square grid is divided on the independent partition.

[0056] The urea injection point located in the independent sector partition is determined according to the coincidence relationship between the straight line connecting the vertices of the independent sector partition and each grid vertex, and the coincidence relationship between the grid vertices.

[0057] In some embodiments, the partitioned ammonia injection control method further includes: determining a vertex closest to the center of the circle based on the overlap relationship of the grid vertices, and moving the vertex downward by a preset distance as a urea injection point.

[0058] In some embodiments, the result that the uniformity of the ammonia concentration distribution determined by simulation is greater than the set value relative to the preset standard deviation also includes: dividing the sector-shaped independent partition into an m×m square grid with the center of the circular flue as the center and the flue radius as the side length, where m>n.

[0059] The urea injection point located in the independent sector partition is determined according to the coincidence relationship between the straight line connecting the vertices of the independent sector partition and each grid vertex, and the coincidence relationship between the grid vertices.

[0060] The flow field simulation of the urea solution injection in each independent partition is performed until the uniformity of the ammonia concentration in each independent partition reaches the preset standard.

[0061] Specifically, in order to solve the problems existing in the background technology, the present invention uses the modeling software Gambit and the computational fluid dynamics software FLUENT to model and simulate the transition flue, reasonably divide the transition flue, independently arrange the spray gun metering module and the dilution water-atomizing air distribution module, and arrange the partitioned flue gas continuous emission monitoring point (CEMS) at the denitrification outlet according to the flow field simulation results. The measurement values of the independent partitioned flue gas continuous emission monitoring point (CEMS) are fed back to the independent partitioned spray gun regulating valve in real time, and the urea injection flow is adjusted in real time to achieve precise ammonia injection.

[0062] The present invention solves the problem of precise ammonia injection control for denitration of the selective catalytic reduction (SCR) denitration equipment of a gas turbine unit, and proposes a design method for zoned ammonia injection control of denitration of a gas turbine based on a urea direct injection pyrolysis system, so as to achieve the accuracy and rapidity of the denitration outlet measurement system and the ammonia injection system, thereby enabling the ammonia injection control system to quickly and accurately allocate the required ammonia injection amount, thereby achieving stable denitration of the unit and saving of reducing agent.

[0063] To achieve the above objectives, the gas turbine denitrification zoned ammonia injection control design method based on a urea direct injection pyrolysis system according to the present invention mainly includes the following arrangements:

[0064] 1) Use Gambit software to establish a solid geometric model of the flue and other dimensions;

[0065] 2) In the solid geometric model of the flue of equal size, when the flue is a circular flue, the flue is divided into 4 independent partitions with the center of the circularity as the point.

[0066] In one example, take a circular transition flue with a radius of 3 meters as an example. Figure 2 As shown, the fan-shaped flue is evenly divided into 9 square grids (n=3, 3×3 grids) with the center of the circle s as the center point. When the vertices of each grid overlap and connect, 4 cross-shaped vertices appear, namely vertices 1, 2, 3, and 4, which can be temporarily determined as urea injection points. Vertices 2 and 3 are on the straight line connecting the fan-shaped vertices a1 and a2, so vertices 2 and 3 are determined as urea injection points. Vertex 1 is determined by the overlap of the square grid vertices. It is close to the center of the circle and forms a triangle with vertices 2 and 3, so vertex 1 is determined as the urea injection point. Because urea injection points 1 and 2 are on the same straight line, two spray guns cannot be arranged on the same straight line from the outside of the flue. In actual operation, according to the simulation calculation structure, vertex 1 can be moved down and offset from the position of vertex 2 to confirm it as the urea injection point.

[0067] 3) The flue before the selective catalytic reduction (SCR) denitrification equipment is divided into four areas corresponding to four independent partitions according to the central position. Under the condition that the urea solution flow rate of each spray gun in each independent partition is the same, the computational fluid dynamics software FLUENT is used to simulate. The landing position of ammonia distribution and the uniformity of ammonia concentration in each independent partition are determined at the simulated detection surface of the selective catalytic reduction (SCR) denitrification equipment inlet. At the same time, corresponding continuous emission monitoring (CEMS) measuring points are added to the flue at the outlet of the selective catalytic reduction (SCR) denitrification equipment.

[0068] 4) If the simulation result is not ideal, the uniformity of ammonia concentration in the area is poor, and the number of urea injection points needs to be increased. The sector flue is evenly divided into 16 square grids (m = 4, 4 × 4 grids) with the transition flue center s as the center point. Figure 3Connecting the vertices of the square creates nine vertices in a cross-shaped pattern. Vertices 1 through 9 can be provisionally identified as urea injection points. Similarly, vertices 3, 7, and 9 lie on the line connecting fan-shaped vertices a1 and a2, so vertices 3, 7, and 9 are identified as urea injection points. Similarly, vertex 1 is determined by merging the vertices of the square grid, so it is also identified as the urea injection point. Further simulations are repeated until the simulation results meet uniformity requirements.

[0069] 5) Each independent partition is equipped with an independent urea metering module to ensure that the spray gun of each independent partition can be adjusted independently and the partitions do not affect each other.

[0070] like Figure 5-7 As shown, it includes a urea metering module 17, a dilution water-atomizing air distribution module 18 and a spray gun 12. The urea metering module 17 includes a urea solution system 17-1, a desalted water system 17-2, a compressed air system 17-3, a urea solution metering part 17-4 and a flushing part 17-5.

[0071] The urea solution system includes manual valve 17-1-1, filter 17-1-2, pressure transmitter 17-1-3, electric on-off valve 17-1-4, electric regulating valve 17-1-5, manual valve 17-1-6, manual valve 17-1-7, pressure transmitter 17-1-8, thermocouple 17-1-9, and local pressure gauge 17-1-10. The desalted water system includes local pressure gauge 17-2-1, manual flushing valve 17-2-2, manual valve 17-2-3, self-operated pressure reducing valve 17-2-4, manual valve 17-2-5, manual valve 17-2-6, turbine flowmeter 17-2-7, pressure transmitter 17-2-8, and local pressure gauge 17-2-9. The compressed air system includes filter 17-3-1, manual valve 17-3-2, three-valve group 17-3-3, manual valve 17-3-4, manual valve 17-3-5, pressure transmitter 17-3-6 and local pressure gauge 17-3-7.

[0072] The independently partitioned urea solution metering section includes a manual valve 17-4-1, an electric on-off valve 17-4-2, a check valve 17-4-3, an electric regulating valve 17-4-4, an on-site pressure gauge 17-4-5, an electromagnetic flowmeter 17-4-6, a mixer 17-4-7, and a resistor 17-4-8. The flushing section includes an electric on-off valve 17-5-1 and a check valve 17-5-2.

[0073] The dilution water distribution module 18-1 of the dilution water-atomizing air distribution module includes a manual valve 18-1-1, a manual regulating valve 18-1-2, an on-site pressure gauge 18-1-3, and a float flowmeter 18-1-4. The atomizing air distribution module 18-2 of the dilution water-atomizing air distribution module includes a manual valve 18-2-1, a manual pressure regulating valve 18-2-2, an on-site pressure gauge 18-2-3, and a float flowmeter 18-2-4.

[0074] 6) A resistor and a float flow meter are installed in the pipeline in front of each independent partition spray gun to ensure that the flow of the spray gun in each partition is consistent.

[0075] 7) Before the urea spray gun of the transition flue, the CEMS at the denitrification inlet quickly measures the NOx / O2 in the flue gas, and the flue gas meter quickly measures the flue gas volume of the load. According to the NOx control value at the denitrification outlet, the total ammonia consumption can be obtained and fed back to the urea master regulating valve of the urea metering module 17 for adjustment. Afterwards, the NOx in each independent partition is obtained under the denitrification partition measurement system, and the average NOx value of each independent partition is compared with the NOx control value. The urea flow master regulating valve is adjusted, and then the NOx concentration measurement value of each independent partition is compared with the NOx average value. The regulating valve of the spray gun in each area is adjusted to control the urea flow of each independent partition, so that the NOx at the denitrification outlet is uniform while meeting the NOx control value, thereby achieving a precise ammonia spraying effect.

[0076] In the desalted water system, the pressure of the dilution water main pipe of the distribution module can be stabilized by a self-supporting pressure reducing valve. Before and after the denitrification is started, the dilution water electric valve is opened, the dilution water electric on-off valve is fully opened, and the urea pipeline is flushed to prevent debris or urea solution crystallization; the manual valve is opened, the dilution water regulating valve and the float flowmeter are adjusted to adjust the dilution water flow. The dilution water and urea solution are mixed in the mixer and then enter the urea solution injection device. The dilution water flow of each spray gun can be initially determined through the early flow field numerical simulation, and the final dilution water flow required for each gun is determined through the ammonia spray leveling test in the later stage to achieve the best atomization effect and reduce the risk of crystallization and blockage of the urea solution pipeline; the compressed air system filter filters impurities in the compressed air, and the atomizing air passes through the three-valve group to filter the moisture in the compressed air and adjust the atomizing air main pipe pressure before the spray gun to a reasonable range; the atomizing air module of the distribution module adjusts the manual regulating valve to make the atomizing air pressure within the design pressure range to achieve the best atomization effect.

[0077] refer to Figure 4According to a second aspect of the embodiments of the present disclosure, a control system for zoned ammonia injection in a gas turbine based on urea direct injection pyrolysis is provided. The control system is capable of implementing the aforementioned method for controlling zoned ammonia injection in a gas turbine based on urea direct injection pyrolysis. The control system includes a spray gun 12 disposed on a spray gun mounting surface 13 within an independent zone of a transition flue 11, and a selective catalytic reduction denitrification device 14 located downstream of the spray gun 12. The selective catalytic reduction denitrification device 14 has a simulated detection surface 15 for flow field simulation on its inlet side and a continuous emission monitoring station (CEMS) mounting surface 16 at its outlet.

[0078] According to a third aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored.

[0079] When the computer program is executed by a processor, it can implement the above-mentioned combustion engine partitioned ammonia injection control method based on urea direct injection pyrolysis.

[0080] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A method for controlling zoned ammonia injection of a combustion engine based on urea direct injection pyrolysis, characterized in that: include: Establish a 3D geometric model of the turbine outlet transition duct and divide it into multiple independent zones based on the shape and size of the duct; An independent spray gun, urea metering module, and dilution water-atomizing air distribution module are installed in each independent partition, and a continuous flue gas emission monitoring point is set at the outlet of the selective catalytic reduction denitrification equipment corresponding to each independent partition; Conduct flow field simulation for urea solution injection in each independent zone to determine the urea injection point and ammonia concentration uniformity of the spray gun in each independent zone; Calculating the average nitrogen oxide concentration of all independent partitions, comparing the average nitrogen oxide concentration with a preset nitrogen oxide control target value, and dynamically correcting the opening of the urea solution main control valve in the urea metering module; The real-time collected nitrogen oxide concentration measurement values of each independent partition are compared with the corresponding average nitrogen oxide concentration values, and the spray gun regulating valve of each independent partition is independently adjusted according to the deviation value.

2. The method for controlling zoned ammonia injection of a gas turbine based on urea direct injection pyrolysis according to claim 1, characterized in that: Before calculating the average nitrogen oxide concentration of all independent partitions and comparing the average nitrogen oxide concentration with a preset nitrogen oxide control target value, and dynamically correcting the opening of the urea solution main regulating valve in the urea metering module, the method further includes: The nitrogen oxide concentration, oxygen concentration and flue gas volume flow rate in the flue gas are measured in real time at the inlet flue of the selective catalytic reduction denitrification equipment, and the total ammonia injection demand value is calculated; The opening of the urea solution main regulating valve in the metering module is adjusted according to the total ammonia injection demand value.

3. The method for controlling zoned ammonia injection of a gas turbine based on urea direct injection pyrolysis according to claim 1, characterized in that: The nitrogen oxide concentration measurement value of each independent partition is obtained in real time through the flue gas continuous emission monitoring measurement point corresponding to each independent partition.

4. The method for controlling zoned ammonia injection of a gas turbine based on urea direct injection pyrolysis according to claim 1, characterized in that: After comparing the real-time collected nitrogen oxide concentration measurement values of each independent zone with the corresponding average nitrogen oxide concentration value, and independently adjusting the spray gun regulating valve of each independent zone according to the deviation value, the method further includes: The dilution water flow and atomizing air pressure of each independent zone spray gun are adjusted through the dilution water-atomizing air distribution module.

5. The method for controlling zoned ammonia injection of a gas turbine based on urea direct injection pyrolysis according to claim 1, characterized in that: The dividing into multiple independent partitions based on the shape and size of the flue includes: dividing the flue into independent partitions with fan-shaped cross sections according to the center and radius of the circular cross-section flue.

6. The method for controlling zoned ammonia injection of a gas turbine based on urea direct injection and pyrolysis according to claim 5, characterized in that: Determining the urea injection point of the spray gun in each independent partition includes: With the center of the circular flue as the center and the flue radius as the side length, an n×n square grid is divided on the independent partition; The urea injection point located in the independent sector partition is determined according to the coincidence relationship between the straight line connecting the vertices of the independent sector partition and each grid vertex, and the coincidence relationship between the grid vertices.

7. The method for controlling zoned ammonia injection of a gas turbine based on urea direct injection and pyrolysis according to claim 6, characterized in that: Also includes: The vertex closest to the center of the circle is determined based on the coincidence relationship of the vertices of each grid, and the vertex is moved down by a preset distance as the urea injection point.

8. The method for controlling zoned ammonia injection of a gas turbine based on urea direct injection pyrolysis according to claim 5, characterized in that: The result that the relative standard deviation of the uniformity of the ammonia concentration distribution determined by the simulation is greater than the set value further includes: dividing the sector-shaped independent partition into an m×m square grid with the center of the circular flue as the center and the flue radius as the side length, where m>n; Determine the urea injection point located in the independent sector partition according to the coincidence relationship between the straight line connecting the vertices of the independent sector partition and each grid vertex, and the coincidence relationship between the grid vertices; The flow field simulation of the urea solution injection in each independent partition is performed until the uniformity of the ammonia concentration in each independent partition reaches the preset standard.

9. A gas turbine zoned ammonia injection control system based on urea direct injection pyrolysis, characterized in that: The control system can implement the combustion engine zoned ammonia injection control method based on urea direct injection pyrolysis as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it can implement the combustion engine partitioned ammonia injection control method based on urea direct injection pyrolysis according to any one of claims 1 to 8.

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