Ammonia spraying flow control and denitration method and device, equipment and storage medium

Abstract

The invention relates to the technical field of denitration, in particular to an ammonia spraying flow control and denitration method and device, equipment and a storage medium, and the method comprises the steps that the target corresponding relation between the flue gas flowing speed and the ammonia flow is obtained; and determining the target ammonia flow corresponding to the current flue gas flow velocity according to the target corresponding relation. The device and the method have the beneficial effects that the utilization efficiency of ammonia gas can be remarkably improved, the ammonia escape phenomenon is reduced, and the overall denitration effect is further improved. According to the method, complex hardware transformation is not needed, and accurate control over the ammonia spraying flow can be achieved only by conducting software upgrading on an existing system.

Description

Technical Field

[0001] The present invention relates to the field of denitration technology, and in particular to an ammonia injection flow control, denitration method and a device, equipment and storage medium thereof. Background Art

[0002] At present, domestic coal-fired power plants mostly adopt the process route of "low nitrogen combustion + SCR denitrification" or "low nitrogen combustion + SNCR denitrification + SCR denitrification" to achieve ultra-low emission standards. The SCR system plays a key role in ultra-low emission control due to its efficient and stable denitrification ability. However, after ultra-low emissions, many units have excessive ammonia escape problems, resulting in ammonium bisulfate corrosion, scaling and blockage in downstream facilities, increasing the resistance of the smoke and air system, and affecting the safety and economic operation of the unit.

[0003] Precision ammonia injection technology is one of the effective solutions to the ammonia escape problem, but the accuracy of the adjustment is greatly affected by the measurement system. At present, the ammonia injection grid control mainly adopts the technical route of first measuring and then adjusting. Although it can improve the defects of fixed valve ammonia injection to a certain extent, due to the serious lag between measurement and valve control, the ammonia injection amount is often too much or too little, resulting in poor precision control effect and the air preheater is still prone to scaling. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In order to overcome the problems existing in the related art, the embodiments of the present disclosure provide ammonia injection flow control, denitration method and its device, equipment and storage medium. The technical solution is as follows: In view of the above problems, the present invention is proposed.

[0006] According to a first aspect of an embodiment of the present disclosure, there is provided a method for controlling an ammonia injection flow rate, comprising: obtaining a target corresponding relationship between a flue gas flow velocity and an ammonia flow rate;

[0007] The target ammonia flow rate corresponding to the current flue gas flow rate is determined according to the target corresponding relationship.

[0008] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: through the above method, the utilization efficiency of ammonia can be significantly improved, and the ammonia escape phenomenon can be reduced, thereby improving the overall denitration effect. This method does not require complex hardware modification, and only requires software upgrades of the existing system to achieve precise control of the ammonia injection flow rate.

[0009] In one embodiment, determining a target ammonia flow rate corresponding to a current flue gas flow rate includes:

[0010] According to the target corresponding relationship, the target ammonia flow rate corresponding to the current flue gas flow rate is controlled by adjusting the current flue gas flow rate.

[0011] In one embodiment, a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate is obtained by setting a nozzle structure;

[0012] The nozzle structure includes a tube body with a through opening inside, a limit block inserted into the through opening, an elastic member connected to one end of the limit block, and a force plate connected to the other end of the limit block;

[0013] When the smoke flows through the force-bearing disk at a first flow rate, the force-bearing disk can overcome the pulling force of the elastic member and pull the limit block to move in the opening to determine the opening area of ​​the opening and the ammonia flow rate passing through the opening.

[0014] In one embodiment, obtaining a target corresponding relationship between the flue gas flow rate and the ammonia flow rate includes:

[0015] Obtaining a first corresponding relationship between the flow velocity of the flue gas and the magnitude of the force on the force-bearing plate;

[0016] Obtaining a second corresponding relationship between the magnitude of the force on the force-bearing disk and the opening area of ​​the through hole;

[0017] A third corresponding relationship between the opening area of ​​the through port and the ammonia flow rate is obtained.

[0018] A target corresponding relationship is determined according to the first corresponding relationship, the second corresponding relationship and the third corresponding relationship.

[0019] In one embodiment, obtaining a first corresponding relationship between the smoke flow velocity and the force-bearing disk includes:

[0020] Obtain multiple flue gas flow rates;

[0021] According to multiple smoke flow velocities and turbulence models, the force magnitude of the force-bearing disk corresponding to each smoke flow velocity is obtained;

[0022] The first corresponding relationship is determined according to a plurality of smoke flow velocities and the magnitude of the force on the force-bearing disk corresponding to each smoke flow velocity.

[0023] In one embodiment, the force magnitude of the force-bearing disk corresponding to each smoke flow velocity is obtained according to a plurality of smoke flow velocities and turbulence models, including:

[0024] For any one of the multiple smoke flow velocities, any one of the smoke flow velocities is used as an input of the turbulence model to obtain a pressure output value of the force-bearing disk corresponding to the current smoke flow velocity;

[0025] The corresponding force magnitude of the force-bearing disk is determined according to the pressure output value of the force-bearing disk and the preset fourth corresponding relationship, wherein the preset fourth corresponding relationship is a linear relationship between the pressure output value of the force-bearing disk and the corresponding force magnitude of the force-bearing disk.

[0026] In one embodiment, obtaining a second corresponding relationship between the force magnitude of the force-bearing disk and the opening area of ​​the through hole includes:

[0027] Obtaining a fifth corresponding relationship between the magnitude of the force on the force-bearing disk and the elastic member;

[0028] Obtaining a sixth corresponding relationship between the elastic member and the opening area of ​​the through opening, wherein the fifth corresponding relationship and the sixth corresponding relationship are linear relationships;

[0029] A second corresponding relationship is determined according to the fifth corresponding relationship and the sixth corresponding relationship.

[0030] In one embodiment, obtaining a third corresponding relationship between the opening area of ​​the through hole and the ammonia flow rate includes:

[0031] Obtaining the opening areas of the plurality of openings and the ammonia flow rate corresponding to the opening area of ​​each opening;

[0032] The third corresponding relationship is determined according to the opening areas of the plurality of openings and the ammonia flow rates corresponding to the opening areas of the respective openings.

[0033] In one embodiment, obtaining a third corresponding relationship between the opening area of ​​the through hole and the ammonia flow rate includes:

[0034] Obtaining the opening areas of the plurality of openings and the ammonia flow rate corresponding to the opening area of ​​each opening;

[0035] The third corresponding relationship is determined according to the opening areas of the plurality of openings and the ammonia flow rates corresponding to the opening areas of the respective openings.

[0036] In one embodiment, after determining the target ammonia flow rate corresponding to the current flue gas flow rate according to the target corresponding relationship, the method further includes:

[0037] Determine the target ammonia injection amount based on the target ammonia flow rate

[0038] According to a second aspect of an embodiment of the present disclosure, there is provided a denitration method, comprising: obtaining a current flue gas flow velocity;

[0039] Determine a target ammonia flow rate corresponding to the current flue gas flow velocity according to the target corresponding relationship, wherein the target corresponding relationship is used to characterize the corresponding relationship between the flue gas flow velocity and the ammonia flow rate;

[0040] Determine the target ammonia injection amount according to the target ammonia flow rate;

[0041] Ammonia gas of a corresponding target ammonia injection amount is injected into the current flue gas and mixed.

[0042] According to a third aspect of an embodiment of the present disclosure, there is provided an ammonia injection flow control device, comprising: an acquisition module, for acquiring a target corresponding relationship between a flue gas flow velocity and an ammonia flow rate; and

[0043] The first determination module is used to determine a target ammonia flow rate corresponding to a current flue gas flow rate according to a target corresponding relationship.

[0044] In one embodiment, it further includes:

[0045] The second determination module is used to determine a target ammonia injection amount according to a target ammonia flow rate.

[0046] According to a fourth aspect of an embodiment of the present disclosure, there is provided a denitration device, comprising: a flue gas injection module, for injecting flue gas;

[0047] An acquisition module, used to acquire a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate;

[0048] A first determination unit is used to determine a target ammonia flow rate corresponding to a current flue gas flow rate according to a target corresponding relationship, wherein the target corresponding relationship is used to characterize a corresponding relationship between the flue gas flow rate and the ammonia flow rate;

[0049] A second determining unit is used to determine a target ammonia injection amount according to a target ammonia flow rate; and

[0050] The ammonia injection module injects ammonia of a corresponding target injection amount into the current flue gas and mixes it.

[0051] According to a fifth aspect of an embodiment of the present disclosure, there is provided an electronic device, comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the first aspect.

[0052] According to a sixth aspect of an embodiment of the present disclosure, there is provided a computer-readable storage medium on which computer instructions are stored, and the instructions implement the steps of the first aspect when executed by a processor.

[0053] According to a seventh aspect of an embodiment of the present disclosure, there is provided a computer program product, comprising a computer program or instructions, which implement the steps of the first aspect when executed by a processor.

[0054] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0056] Figure 1 A schematic diagram of a nozzle structure.

[0057] Figure 2 This is a schematic diagram of direction A.

[0058] Figure 3 Model diagram for uniform flow down the force plate.

[0059] Figure 4 Fit a straight line graph between the force on the force plate and the incoming flow velocity.

[0060] Figure 5 It is a straight line diagram fitting the branch flow and the opening area. DETAILED DESCRIPTION

[0061] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0062] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0063] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0064] Example 1

[0065] When people use ammonia injection systems for flue gas denitrification, they often encounter the problem of inaccurate ammonia flow control, which leads to low ammonia utilization efficiency and even affects the denitrification effect.

[0066] In order to overcome these technical problems, this embodiment proposes a method for controlling ammonia injection flow rate, which comprises the following steps:

[0067] S101: Obtaining a target correspondence between flue gas flow velocity and ammonia flow rate, wherein the target correspondence can be predetermined by experimental data and mathematical models, reflecting the ammonia flow rate required at different flue gas flow rates to ensure optimal denitration reaction.

[0068] S102: Determine the target ammonia flow rate corresponding to the current flue gas flow velocity according to the target correspondence. The flue gas flow velocity is monitored in real time by a flow velocity sensor installed in the flue, and the currently required ammonia flow rate is calculated using the pre-acquired target correspondence, thereby achieving precise control. The target ammonia flow rate in the present invention is the currently required ammonia flow rate calculated by using the pre-acquired target correspondence, and the target ammonia flow rate is the demand that changes in real time with the flue gas flow velocity.

[0069] In industrial applications, boiler combustion will produce flue gas, and there will be a large amount of NOx in the flue gas, which seriously pollutes the air. In practical applications, SCR technology is used to spray amino reducing agent gas into the flue at 300-400°C downstream of the boiler. Under the action of the catalyst, the selectivity of the amino reducing agent is used to reduce NOx in the flue gas into harmless N2 and H2O, so as to reduce NOx emissions.

[0070] However, the flue gas flow velocity is affected by multiple factors, such as boiler load, flue gas temperature, etc. Therefore, it is difficult to cope with changing working conditions by relying solely on a fixed amount of ammonia. The present invention can dynamically adjust the amount of ammonia under different working conditions by obtaining the target correspondence between the flue gas flow velocity and the ammonia flow rate to ensure the stable operation of the denitrification system.

[0071] Through the above method, the utilization efficiency of ammonia can be significantly improved, and the ammonia escape phenomenon can be reduced, thereby improving the overall denitrification effect. This method does not require complex hardware modification, and only requires software upgrades to the existing system to achieve precise control of the ammonia injection flow rate.

[0072] In the present disclosure, the specific implementation steps of the ammonia injection flow control method are described in detail, which can effectively improve the utilization efficiency of ammonia and the denitrification effect.

[0073] Example 2

[0074] This embodiment provides an ammonia injection flow control method, which is based on Embodiment 1, but the difference is that the implementation method of determining the target ammonia flow rate corresponding to the current flue gas flow rate includes: according to the target correspondence, controlling the target ammonia flow rate corresponding to the current flue gas flow rate by adjusting the current flue gas flow rate.

[0075] Specifically, the current flow velocity of the flue gas can be adjusted by adjusting the speed of the blower or adjusting the opening of the damper in the flue to change the flow velocity of the flue gas.

[0076] In the present disclosure, the target ammonia flow rate and the flue gas flow rate can be adjusted in the same direction through the target corresponding relationship between the flue gas flow rate and the ammonia flow rate.

[0077] In one achievable manner, a nozzle structure 100 is provided at the end of a branch pipe of the SCR system to obtain a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate:

[0078] The nozzle structure 100 of the branch pipe includes a pipe body 101 with a through opening inside, a limit block 102 inserted into the through opening, an elastic member 103 connected to one end of the limit block 102 , and a force plate 104 connected to the other end of the limit block 102 .

[0079] The tube body 101 is used for introducing ammonia gas flow, and has a nozzle facing the force-bearing disk 104 .

[0080] A partition plate 101a is disposed in the tube body 101, and a through opening is formed on the partition plate 101a.

[0081] The limiting block 102 is a wedge-shaped block with a triangular cross section. The limiting block 102 is inserted into the through-port through its tip and can control the opening area of ​​the through-port by changing its longitudinal position in the through-port.

[0082] The elastic member is an elastic material satisfying Hooke's law. Further, the elastic member 103 may be a spring, a rubber material, or the like.

[0083] The force-bearing disk 104 is a plate-shaped structure, which is perpendicular to the longitudinal direction of the tube body 101 . The smoke and ammonia gas sprayed through the nozzle of the tube body 101 can vertically impact the force-bearing disk 104 .

[0084] One end of the limit block 102 is connected to the elastic member 103, and the elastic member 103 is fixed to the inside of the tube body 101 through a connecting block 105, and the other end of the limit block 102 is fixed to the force plate 104 through a rope or a traction rod or other components that can play a role in transmitting tension.

[0085] When the smoke flows through the force-bearing disk 104 at a first flow rate, the force-bearing disk 104 can overcome the pulling force of the elastic member 103 and pull the limiting block 102 to move in the opening to determine the opening area of ​​the opening and the ammonia flow rate passing through the opening.

[0086] Specifically, when the flue gas flows through the force-bearing disk 104 at a certain flow rate (referred to as the "first flow rate"), the force-bearing disk 104 will be subjected to the impact force of the flue gas, and the impact force of the flue gas will cause the force-bearing disk 104 to have a tendency to move (wherein, the flue gas flow rate is relatively large, and the impact force is also relatively large). Under the impact force of the flue gas flow, the force-bearing disk 104 will try to move in the direction of the flue gas flow. This tendency to move needs to overcome the tension of the elastic member 103 (the elastic member 103 is usually a spring or a similar elastic structure, and its function is to apply a reverse restoring force to the force-bearing disk 104 and the limit block 102 to ensure that they return to their original position when there is no external force). When the limit block 102 moves in the passage, it will directly affect the opening area of ​​the passage, and the larger the opening area, the greater the ammonia flow rate allowed to pass; conversely, the smaller the opening area, the smaller the ammonia flow rate, that is, by adjusting the opening area of ​​the passage, the ammonia flow rate through the passage can be controlled. This control mechanism ensures that the ammonia flow rate can be automatically adjusted at different flue gas flow rates to achieve precise ammonia injection control.

[0087] In the present disclosure, the movement of the force-bearing disk 104 caused by the change in the flue gas flow velocity is utilized to automatically adjust the opening area of ​​the port, thereby accurately controlling the ammonia flow rate.

[0088] In one embodiment, the above step S101 includes the following sub-steps A1-A4:

[0089] In A1, a first corresponding relationship between the flow velocity of the smoke and the magnitude of the force on the force-bearing disk 104 is obtained.

[0090] Specifically, the first corresponding relationship can be obtained by the following method:

[0091] The first acquisition method - experimental measurement method:

[0092] Acquisition process: Install the force plate 104 and related measuring equipment in the flue gas duct, generate different flue gas flow rates by adjusting the fan speed, use the force sensor to measure the force exerted on the force plate 104 at each flow rate, record the flue gas flow rate and the corresponding force magnitude each time measured, and establish the first corresponding relationship between the flue gas flow velocity and the force magnitude of the force plate 104.

[0093] The second acquisition method - computational simulation method:

[0094] Acquisition process: Use computational fluid dynamics (CFD) software to establish a mathematical model of the flue gas flow velocity and the force magnitude of the force plate 104. By inputting different flue gas flow velocities, simulate the force conditions of the force plate 104 at each flow velocity. Through the simulation results, determine the first corresponding relationship between the flue gas flow velocity and the force magnitude of the force plate 104.

[0095] In A2, a second corresponding relationship between the magnitude of the force on the force-bearing disk 104 and the opening area of ​​the through-port is obtained.

[0096] Specifically, the second corresponding relationship can be obtained by the following method:

[0097] The first acquisition method - experimental measurement method:

[0098] Acquisition process: Under laboratory conditions, use an adjustable elastic member 103 and a limit block 102 to record the relationship between the force on the force disk 104 and the opening area of ​​the port. By applying different forces, measure the distance that the limit block 102 moves in the port to determine the opening area of ​​the port. Record the opening area of ​​the port under each force condition to establish a second corresponding relationship between the force on the force disk 104 and the opening area of ​​the port.

[0099] The second acquisition method - theoretical calculation method:

[0100] Acquisition process: The mechanical formula can be used to convert the force exerted on the force disk 104 into a change in the opening area of ​​the through-port through the limit block 102 and the elastic member 103, derive the mathematical relationship between the force magnitude and the opening area, establish a corresponding theoretical model, and determine the second corresponding relationship between the final force magnitude of the force disk 104 and the opening area of ​​the through-port.

[0101] In A3, a third correspondence relationship between the opening area of ​​the through-port and the ammonia flow rate is obtained.

[0102] Specifically, the third corresponding relationship can be obtained by the following method:

[0103] The first acquisition method - experimental measurement method:

[0104] Acquisition process: In the experimental device, a nozzle with an adjustable opening is set. By changing the opening area, a flow meter is used to measure the flow rate of ammonia passing through, and the ammonia flow rate under different opening areas is recorded to establish a third corresponding relationship between the opening area and the ammonia flow rate.

[0105] The second acquisition method - computational simulation method:

[0106] Acquisition process: Use CFD software to simulate the flow of ammonia under different port opening areas, input different opening areas, simulate and calculate the ammonia flow rate, and determine the third corresponding relationship between the opening area and the ammonia flow rate through the simulation results.

[0107] In A4, a target corresponding relationship is determined according to the first corresponding relationship, the second corresponding relationship, and the third corresponding relationship.

[0108] Specifically, there is no specific order among the steps A1-A3 recorded above, that is, the factor for determining the target correspondence relationship is determined by the correspondence between the first correspondence relationship, the second correspondence relationship and the third correspondence relationship rather than the order among the above correspondence relationships.

[0109] In the present disclosure, the data of the above three corresponding relationships are integrated to establish a comprehensive database of the relationship between flue gas flow rate, force on the force plate 104, port opening area and ammonia flow rate. Through multiple regression analysis or machine learning algorithm, the optimal corresponding relationship between flue gas flow rate and ammonia flow rate under complex working conditions can be determined, and precise control of ammonia injection flow rate is achieved. This method not only improves the ammonia utilization efficiency and optimizes the denitrification effect, but also significantly reduces ammonia escape, and improves the stability and economic benefits of the overall system.

[0110] In one embodiment, the above step A1 includes the following sub-steps A11-A13:

[0111] In A11, a plurality of smoke flow velocities are obtained, wherein the manner of obtaining the smoke flow velocity includes but is not limited to obtaining smoke flow velocity data through a differential pressure flow meter, an ultrasonic flow meter, or a laser Doppler flow meter.

[0112] In A12, the force magnitude of the force-bearing disk 104 corresponding to each flue gas flow velocity is obtained according to a plurality of flue gas flow velocities and turbulence models, wherein the turbulence model is a mathematical model and numerical method used to simulate and describe the turbulent behavior of a fluid.

[0113] Specifically, the turbulence model of the force magnitude of the force plate 104 corresponding to each flue gas flow velocity can be obtained according to multiple flue gas flow velocities and turbulence models, including but not limited to the k-epsilon model, large eddy simulation, and Reynolds-averaged Navier-Stokes equations.

[0114] In A13, a first corresponding relationship is determined according to a plurality of smoke flow velocities and the magnitude of the force on the force-bearing disk 104 corresponding to each smoke flow velocity.

[0115] Specifically, steps A11-A13 can obtain the flue gas flow velocity data under different working conditions (the flow velocity data represents the various working condition changes in the actual industrial process) through experimental measurement and simulation, and use the turbulence model to analyze the force exerted on the force plate 104 under different flue gas flow rates through experiments or computational fluid dynamics (CFD) simulation. The above-mentioned acquired data are comprehensively analyzed, and a mathematical model between the flue gas flow velocity and the force magnitude of the force plate 104 is established using statistical analysis methods (such as multivariate regression analysis). According to this model, the first corresponding relationship between the flue gas flow velocity and the force plate 104 is determined.

[0116] In the present disclosure, by establishing a precise correspondence between the flue gas flow velocity and the force magnitude of the force-bearing disk 104, accurate control of the ammonia injection flow rate can be achieved, ensuring that the ammonia volume matches the actual demand and improving the denitrification effect. Further, the precisely controlled ammonia volume can ensure that the denitrification reaction can be carried out under optimal conditions under different working conditions, thereby improving the efficiency of the overall denitrification system.

[0117] In one embodiment, the above step A12 includes the following sub-steps A121-A122:

[0118] In A121, for any one of the multiple smoke flow velocities, any one of the smoke flow velocities is used as the input of the turbulence model to obtain the pressure output value of the force disk 104 corresponding to the current smoke flow velocity, wherein the pressure output value of the force disk 104 includes the pressure output value of the front side of the force disk 104 and the pressure output value of the back side of the force disk 104.

[0119] Specifically, determine the turbulence model, such as the k-ε model and the k-ω model, set the turbulence intensity, turbulence viscosity ratio and other parameters to match the actual smoke flow conditions, and use each smoke flow velocity as the input parameter of the turbulence model. Set the corresponding flow velocity value at the inlet, solve the fluid equation, obtain the velocity field, pressure field and turbulence characteristics of the smoke flow, and output the pressure output value.

[0120] In A122, the corresponding force magnitude of the force disk 104 is determined according to the pressure output value of the force disk 104 and the preset fourth corresponding relationship, wherein the preset fourth corresponding relationship is the linear relationship between the pressure output value of the force disk 104 and the corresponding force magnitude of the force disk 104.

[0121] Specifically, the fourth corresponding relationship is preset as a linear relationship, and the force magnitude of the force-bearing disk 104 is calculated by combining the difference in pressure output values ​​between the front and back sides of the force-bearing disk 104 .

[0122] Furthermore, the following research was conducted on the above method:

[0123] 1. Research model: Research the force plate 104 under the infinite space M and the uniform incoming flow. The analysis model of the force plate 104 is as follows. The diameter of the force plate 104 is 100 mm. The force of the force plate 104 is studied by changing the incoming flow velocity. Air is selected as the medium, which is assumed to be an incompressible fluid, and the turbulence model is adopted. The calculation is performed using Fluent software, and the discrete parameters are discretized using the second-order accuracy upwind method and SIMPLIC algorithm.

[0124] 2. Result analysis: For different numbers of grids, the following data results are obtained:

[0125] Grid Data Ten thousand 3 70 300 500 Front pressure of force plate Pa 15 -5 -10 -9 Pressure on the back of the force plate Pa 330 270 265 268

[0126] Through the above verification experiments, it can be seen that when the number of grids is 3 million or more, the pressure results on the front and back sides of the force-bearing disk 104 have tended to be stable, indicating that the grid division at this time can provide reliable calculation results and ensure the accuracy of the force analysis of the force-bearing disk 104.

[0127] 3. Simulation experiment: In order to balance accuracy and calculation efficiency, the calculation is performed with about 3 million grids. Combined with the pressure difference between the front and back sides of the force plate 104, the force on the force plate 104 can be calculated. The following table shows the simulation results under five working conditions:

[0128] project Inflow velocity v Differential pressure of force plate Force F on the load plate unit m / s Pa N Condition 1 10 82 0.64 Condition 2 12 117 0.91 Condition 3 15 184 1.44 Condition 4 18 266 2.08 Condition 5 20 328 2.57

[0129] According to the above simulation results, the least squares fitting method (such as Figure 4 As shown), the force on the force-bearing disk 104 and the incoming flow velocity are approximately in a linear relationship.

[0130] In the present disclosure, by taking the smoke flow velocity as the input of the turbulence model, the pressure output value of the force plate 104 corresponding to the smoke flow velocity is obtained. Furthermore, the corresponding force magnitude of the force plate 104 is determined in combination with the pressure output value of the force plate 104 and the preset fourth corresponding relationship, so as to obtain the first corresponding relationship between the smoke flow velocity and the force magnitude of the force plate 104.

[0131] In one embodiment, the above step A2 includes the following sub-steps A21-A23:

[0132] In A21, a fifth corresponding relationship between the force magnitude of the force-bearing disk 104 and the elastic member 103 is obtained, wherein the fifth corresponding relationship is determined according to Hooke's law, that is, the fifth corresponding relationship is a linear relationship.

[0133] In A22, a sixth corresponding relationship between the elastic member 103 and the opening area of ​​the through-port is obtained, wherein the fifth corresponding relationship and the sixth corresponding relationship are linear relationships.

[0134] Specifically, when the flue gas velocity v fluctuates within the range of 10-20 m / s, the displacement of the limit block 102 is 0-L (the length of L does not exceed the length of the tube body 101). According to Hooke's law, the elongation △L of the elastic member 103 is proportional to F, that is, △L=F·k;

[0135] The acute angle of the stopper 102 is θ, and the width of the opening (ie, the width of the stopper 102) is W. When the displacement length of the force bearing plate 104 is ΔL, the area change of the opening is ΔS. ΔS=ΔL·tanθ·W.

[0136] In the flue gas flow with a velocity v, the flue gas generates F on the force-bearing disk 104, causing it to quickly drive the limit block 102 to move, causing the elastic member 103 to stretch until the elastic member 103 reaches a certain stretching length, and the elastic member 103 and the force-bearing disk 104 balance the tension on the limit block 102, and the limit block 102 also stops moving, that is, the linear relationship between the opening area and the force on the force-bearing disk 104 is as follows:

[0137] △S=(k·tanθ·W)·F

[0138] In A23, a second corresponding relationship is determined according to the fifth corresponding relationship and the sixth corresponding relationship.

[0139] In the present disclosure, the second corresponding relationship between the force magnitude of the force disk 104 and the opening area of ​​the through-port is obtained by combining the fifth corresponding relationship between the force magnitude of the force disk 104 and the elastic member 103 with the sixth corresponding relationship between the elastic member 103 and the opening area of ​​the through-port.

[0140] In one embodiment, the above step A3 includes the following sub-steps A31-A32:

[0141] In A31, the opening areas of the plurality of ports and the ammonia gas flow rates corresponding to the opening areas of the respective ports are acquired.

[0142] In A32, a third correspondence is determined based on the opening areas of the plurality of ports and the ammonia flow rates corresponding to the opening areas of the respective ports.

[0143] Specifically, the determination of the third corresponding relationship includes but is not limited to obtaining the corresponding output value of the ammonia flow rate by inputting the opening areas of multiple ports as input values ​​into the turbulence model, wherein the turbulence model includes but is not limited to the k-epsilon model, large eddy simulation, and Reynolds-averaged Navier-Stokes equations.

[0144] Furthermore, the following research was conducted on the above method:

[0145] ① Research model: Study the influence of different opening areas in the branch pipe on the branch pipe flow under the same boundary conditions. In order to simplify the model, the experimental conditions are that the opening area accounts for 60% and the inlet constant pressure is 3000Pa.

[0146] ②Result analysis: For different numbers of grids, the following data results are obtained:

[0147] Grid quantity Ten thousand 0.2 6 200 600 Branch flow kg / s 0.00569 0.00561 0.00558 0.00554

[0148] Through the above verification experiments, it can be seen that when the number of grids is 2 million or more, the branch flow results change very little, indicating that the calculation results at this time have high credibility and accuracy.

[0149] ③Simulation experiment: In order to balance accuracy and computational efficiency, the calculation was performed with a grid size of about 2 million. The following table shows the simulation results under five working conditions:

[0150] project Port area ratio Orifice area size △S Branch flow q unit ％ <h2 style=";text-align:left;direction:ltr"><![CDATA[×10 <h2 style=";text-align:left;direction:ltr"> -6 <h2 style=";text-align:left;direction:ltr"> m2]]><h2 style=";text-align:left;direction:ltr"> <![CDATA[×10 -3 kg / s]]> Condition 1 20％ 33.79 1.913 Condition 2 40％ 67.58 3.725 Condition 3 60％ 101.4 5.540 Condition 4 80％ 135.2 7.353 Condition 5 100％ 169.0 9.166

[0151] According to the above simulation results, the least squares fitting method (such as Figure 5 As shown in the figure, the branch flow rate q and the opening area △S are approximately linearly related:

[0152] q×10 -3 =0.055×10 -6 ×△S+0.1387

[0153] In one embodiment, after step S102, step S103 is further included:

[0154] S103: Determine a target ammonia injection amount according to the target ammonia flow rate.

[0155] Specifically, according to a pre-established target correspondence (the correspondence can be obtained through experimental data and mathematical models, and specifically reflects the ammonia flow rate required under different flue gas flow rates and operating conditions), the target ammonia flow rate under the current operating conditions is determined, and the target ammonia injection amount is further calculated through the ammonia flow rate.

[0156] In the present disclosure, by accurately calculating the target ammonia injection amount, the ammonia amount is accurately controlled. This method not only improves the denitrification efficiency and reduces the ammonia escape phenomenon, but also significantly improves the stability and economic benefits of the system.

[0157] In summary, through detailed experiments and simulation methods, the target correspondence between the flue gas flow velocity and the ammonia flow rate is accurately obtained, and this relationship is used to achieve precise control of the ammonia injection flow rate. This method significantly improves the ammonia utilization efficiency, optimizes the denitrification effect, reduces the ammonia escape phenomenon, and improves the stability and economic benefits of the overall system. In addition, this method does not require complex hardware modifications, only software upgrades to the existing system, reducing the difficulty and cost of system modification. Through data-driven intelligent control, the present invention can adjust the amount of ammonia in real time under different operating conditions, ensuring that the system operates stably under various operating conditions, reducing operating costs and improving economic benefits.

[0158] In one embodiment, a method for controlling ammonia injection flow rate comprises the following steps:

[0159] In S201, a plurality of flue gas flow velocities are obtained.

[0160] In S202, for any one of the multiple smoke flow velocities, any one of the smoke flow velocities is used as the input of the turbulence model to obtain the pressure output value of the force disk 104 corresponding to the current smoke flow velocity; the corresponding force magnitude of the force disk 104 is determined according to the pressure output value of the force disk 104 and the preset fourth corresponding relationship, wherein the preset fourth corresponding relationship is a linear relationship between the pressure output value of the force disk 104 and the corresponding force magnitude of the force disk 104.

[0161] In S203, a first corresponding relationship is determined according to a plurality of smoke flow velocities and the magnitude of the force on the force-bearing disk 104 corresponding to each smoke flow velocity.

[0162] In S204, a fifth corresponding relationship between the force magnitude of the force-bearing disk 104 and the elastic member 103 is obtained;

[0163] Obtaining a sixth corresponding relationship between the elastic member 103 and the opening area of ​​the through opening, wherein the fifth corresponding relationship and the sixth corresponding relationship are linear relationships;

[0164] A second corresponding relationship is determined according to the fifth corresponding relationship and the sixth corresponding relationship.

[0165] In S205, the opening areas of the plurality of openings and the ammonia flow rate corresponding to the opening area of ​​each opening are obtained;

[0166] The third corresponding relationship is determined according to the opening areas of the plurality of openings and the ammonia flow rates corresponding to the opening areas of the respective openings.

[0167] In S206, a target corresponding relationship is determined according to the first corresponding relationship, the second corresponding relationship and the third corresponding relationship.

[0168] In S207, a target ammonia flow rate corresponding to the current flue gas flow velocity is determined according to the target corresponding relationship.

[0169] In S208, according to the target corresponding relationship, the target ammonia flow rate corresponding to the current flue gas flow rate is controlled by adjusting the current flue gas flow rate.

[0170] In S209, a target ammonia injection amount is determined according to the target ammonia flow rate.

[0171] In summary, through detailed experimental and simulation methods, a method for controlling the flow rate of ammonia injection is proposed. By acquiring and analyzing multiple flue gas flow velocity data, and combining the turbulence model and linear relationship, the relationship between the pressure output value of the force disk 104 and the force magnitude is accurately determined. In addition, by establishing the correspondence between the force disk 104 and the elastic member 103 and the correspondence between the port opening area and the ammonia flow rate, the overall target correspondence of the system is further determined. In practical applications, through this target correspondence, the flue gas flow velocity and the amount of ammonia can be adjusted in real time to ensure the best denitrification effect under various working conditions. This method significantly improves the utilization efficiency of ammonia, reduces ammonia escape, and improves the stability and economic benefits of the denitrification system. Since this method does not require complex hardware modification, only software upgrades of the existing system are required, thereby reducing the implementation cost. At the same time, through data-driven intelligent control, the adaptability and economic benefits of the system are further enhanced.

[0172] Example 3

[0173] In the industrial denitrification process, due to the frequent changes in flue gas flow velocity, it is difficult to achieve the best denitrification effect by relying solely on a fixed ammonia injection amount.

[0174] In order to overcome this technical problem, this embodiment provides a denitration method, which comprises the following steps:

[0175] S301: Obtain the current flue gas flow velocity, wherein the flue gas flow velocity data may be obtained by a differential pressure flow meter, an ultrasonic flow meter or a laser Doppler flow meter.

[0176] S302: Determine the target ammonia flow rate corresponding to the current flue gas flow rate based on the target correspondence relationship. The target correspondence relationship is used to characterize the correspondence between the flue gas flow rate and the ammonia flow rate. The target correspondence relationship can be predetermined by experimental data and mathematical models. The target correspondence relationship reflects the required ammonia flow rate under different flue gas flow rates to ensure the optimal denitrification reaction.

[0177] Specifically, in S202, the pre-established target correspondence relationship is used to determine the required target ammonia flow rate according to the currently acquired flue gas flow velocity.

[0178] S303: Determine a target ammonia injection amount according to the target ammonia flow rate.

[0179] Specifically, the target ammonia injection amount is determined according to the target ammonia flow rate, which can be calculated by the following formula:

[0180]

[0181] Among them, Q NH3 is the target ammonia injection amount, CNOx is the concentration of NOx in flue gas, Q gas is the flue gas flow rate, E eff For the denitrification efficiency.

[0182] S304: injecting ammonia gas of a corresponding target ammonia injection amount into the current flue gas and mixing the mixture.

[0183] Specifically, according to the calculated target ammonia injection amount, a corresponding amount of ammonia can be injected into the flue gas by adjusting the valve opening or injection pressure of the ammonia injection device, so that the ammonia and the flue gas are fully mixed.

[0184] Specifically, the method is implemented by obtaining the current flow velocity of the flue gas and calculating the target ammonia flow rate corresponding to the current flow velocity of the flue gas according to a predetermined target correspondence, further determining the corresponding ammonia injection amount through the target ammonia flow rate, and finally, injecting a corresponding amount of ammonia into the flue gas to achieve sufficient mixing of the ammonia and the flue gas.

[0185] In summary, this method can significantly improve the utilization efficiency of ammonia and avoid unnecessary waste by monitoring the flue gas flow velocity in real time and dynamically adjusting the ammonia injection amount according to the target correspondence. Secondly, the denitrification effect is optimized, so that the denitrification system can maintain the best operating state under various working conditions, reduce ammonia escape, and thus reduce environmental pollution.

[0186] Example 4

[0187] A fourth embodiment of the present invention provides an ammonia injection flow control device, the device comprising:

[0188] An acquisition module, used to acquire a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate; and

[0189] The first determination module is used to determine the target ammonia flow rate corresponding to the current flue gas flow rate according to the target correspondence relationship. Specifically, according to the target correspondence relationship, the target ammonia flow rate corresponding to the current flue gas flow rate is controlled by adjusting the current flue gas flow rate.

[0190] Furthermore, the ammonia injection flow control device in this embodiment performs the following steps:

[0191] S401: Acquire multiple flue gas flow velocities.

[0192] S402: For any smoke flow rate among multiple smoke flow rates, use any smoke flow rate as the input of the turbulence model to obtain the pressure output value of the force-bearing disk 104 corresponding to the current smoke flow rate; determine the corresponding force magnitude of the force-bearing disk 104 according to the pressure output value of the force-bearing disk 104 and a preset fourth corresponding relationship, wherein the preset fourth corresponding relationship is a linear relationship between the pressure output value of the force-bearing disk 104 and the force magnitude of the force-bearing disk 104 corresponding to the force-bearing disk 104.

[0193] S403: Determine a first corresponding relationship according to a plurality of smoke flow velocities and the magnitude of the force on the force-bearing disk 104 corresponding to each smoke flow velocity.

[0194] S404: Obtaining a fifth corresponding relationship between the magnitude of the force on the force-bearing disk 104 and the elastic member 103;

[0195] Obtaining a sixth corresponding relationship between the elastic member 103 and the opening area of ​​the through opening, wherein the fifth corresponding relationship and the sixth corresponding relationship are linear relationships;

[0196] A second corresponding relationship is determined according to the fifth corresponding relationship and the sixth corresponding relationship.

[0197] S405: Obtaining a third corresponding relationship between the opening area of ​​the port and the ammonia flow rate, including:

[0198] Obtaining the opening areas of the plurality of openings and the ammonia flow rate corresponding to the opening area of ​​each opening;

[0199] The third corresponding relationship is determined according to the opening areas of the plurality of openings and the ammonia flow rates corresponding to the opening areas of the respective openings.

[0200] S406: Determine a target corresponding relationship according to the first corresponding relationship, the second corresponding relationship, and the third corresponding relationship.

[0201] In one embodiment, the ammonia injection flow control device further includes a second determination module, which is used to determine a target ammonia injection amount according to a target ammonia flow rate.

[0202] Example 5

[0203] The fifth embodiment of the present invention provides a denitration device, which includes the ammonia injection flow control device in embodiment 4. In addition, the denitration device includes a flue gas injection module and an ammonia injection module. The specific scheme is as follows:

[0204] The denitrification device includes:

[0205] A smoke injection module, used for injecting smoke;

[0206] An acquisition module, used to acquire a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate;

[0207] A first determination unit is used to determine a target ammonia flow rate corresponding to a current flue gas flow rate according to a target corresponding relationship, wherein the target corresponding relationship is used to characterize a corresponding relationship between the flue gas flow rate and the ammonia flow rate;

[0208] A second determining unit is used to determine a target ammonia injection amount according to a target ammonia flow rate; and

[0209] The ammonia injection module injects ammonia of a corresponding target injection amount into the current flue gas and mixes it.

[0210] Furthermore, the smoke injection module includes: a smoke inlet: an inlet connected to the smoke duct, used to introduce the smoke to be treated; a nozzle assembly: used to inject the smoke into a designated area; a pressure control valve: to adjust the smoke pressure entering the nozzle to ensure stable injection; a flow meter: installed before and after the nozzle, used to monitor the flow rate and pressure of the injected smoke in real time; and a controller: receives a signal from the flow meter and adjusts the pressure control valve to maintain the set flow rate and pressure.

[0211] The ammonia injection module includes: an ammonia storage tank: for storing liquid or gaseous ammonia, with a pressure regulating device to ensure a constant supply pressure; a delivery pipeline: a pipeline connecting the ammonia storage tank and the injection nozzle, with insulation and anti-corrosion functions; an injection nozzle: an efficient atomization device to ensure that ammonia is evenly distributed in the flue gas; a flow control valve: precisely controls the flow of ammonia to ensure that it is injected according to the set target ammonia injection amount; a mixer: usually a static mixer, installed in the flue gas channel to ensure that ammonia and flue gas are fully mixed.

[0212] Specifically, the flue gas injection module introduces and monitors the current flue gas flow rate, and the acquisition module determines the required target ammonia flow rate according to the pre-established target correspondence; then, the first determination unit transmits the target ammonia flow rate to the second determination module to calculate the target ammonia injection amount; then, the ammonia injection module adjusts the flow control valve according to the target ammonia injection amount, accurately injects ammonia, and ensures that the ammonia and flue gas are fully mixed through the mixer; finally, the system continuously monitors and adjusts various parameters to ensure stable and efficient operation of the denitrification process.

[0213] Example 6

[0214] A sixth embodiment of the present invention provides an electronic device, including:

[0215] processor;

[0216] a memory for storing processor-executable instructions;

[0217] Wherein, the processor is configured to: obtain a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate;

[0218] The target ammonia flow rate corresponding to the current flue gas flow rate is determined according to the target corresponding relationship.

[0219] The above processor may also be configured to:

[0220] Determine the target ammonia flow rate corresponding to the current flue gas flow rate, including,

[0221] According to the target corresponding relationship, the target ammonia flow rate corresponding to the current flue gas flow rate is controlled by adjusting the current flue gas flow rate.

[0222] The target corresponding relationship between the flue gas flow velocity and the ammonia flow rate is obtained by setting the nozzle structure 100;

[0223] The nozzle structure 100 includes a tube body 101 with a through opening inside, a stopper 102 inserted into the through opening, an elastic member 103 connected to one end of the stopper 102, and a force plate 104 connected to the other end of the stopper 102;

[0224] When the smoke flows through the force-bearing disk 104 at a first flow rate, the force-bearing disk 104 can overcome the pulling force of the elastic member 103 and pull the limiting block 102 to move in the opening to determine the opening area of ​​the opening and the ammonia flow rate passing through the opening.

[0225] Obtain the target correspondence between the flue gas flow velocity and the ammonia flow rate, including,

[0226] Obtaining a first corresponding relationship between the flow velocity of the smoke and the magnitude of the force on the force-bearing disk 104;

[0227] Obtaining a second corresponding relationship between the magnitude of the force on the force-bearing disk 104 and the opening area of ​​the through opening;

[0228] A third corresponding relationship between the opening area of ​​the through port and the ammonia flow rate is obtained.

[0229] A target corresponding relationship is determined according to the first corresponding relationship, the second corresponding relationship and the third corresponding relationship.

[0230] Obtaining a first corresponding relationship between the flue gas flow velocity and the force-bearing disk 104 includes:

[0231] Obtain multiple flue gas flow rates;

[0232] According to a plurality of smoke flow velocities and turbulence models, the force magnitude of the force-bearing disk 104 corresponding to each smoke flow velocity is obtained;

[0233] The first corresponding relationship is determined according to a plurality of smoke flow velocities and the magnitude of the force on the force-bearing disk 104 corresponding to each smoke flow velocity.

[0234] According to multiple smoke flow velocities and turbulence models, the force magnitude of the force-bearing disk 104 corresponding to each smoke flow velocity is obtained, including:

[0235] For any of the multiple smoke flow velocities, any of the smoke flow velocities is used as an input of the turbulence model to obtain a pressure output value of the force-bearing disk 104 corresponding to the current smoke flow velocity;

[0236] The corresponding force magnitude of the force disk 104 is determined according to the pressure output value of the force disk 104 and the preset fourth corresponding relationship, wherein the preset fourth corresponding relationship is a linear relationship between the pressure output value of the force disk 104 and the corresponding force magnitude of the force disk 104 .

[0237] Obtaining a second corresponding relationship between the magnitude of the force on the force-bearing disk 104 and the opening area of ​​the through hole includes:

[0238] Obtaining a fifth corresponding relationship between the magnitude of the force on the force-bearing disk 104 and the elastic member 103;

[0239] Obtaining a sixth corresponding relationship between the elastic member 103 and the opening area of ​​the through opening, wherein the fifth corresponding relationship and the sixth corresponding relationship are linear relationships;

[0240] A second corresponding relationship is determined according to the fifth corresponding relationship and the sixth corresponding relationship.

[0241] Obtaining a third corresponding relationship between the opening area of ​​the port and the ammonia flow rate, including:

[0242] Obtaining the opening areas of the plurality of openings and the ammonia flow rate corresponding to the opening area of ​​each opening;

[0243] The third corresponding relationship is determined according to the opening areas of the plurality of openings and the ammonia flow rates corresponding to the opening areas of the respective openings.

[0244] After determining the target ammonia flow rate corresponding to the current flue gas flow rate according to the target corresponding relationship, the method further includes:

[0245] The target ammonia injection amount is determined based on the target ammonia flow rate.

[0246] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0247] Electronic equipment is applicable to terminal equipment. For example, the equipment can be a computer, a tablet device, a personal digital assistant, etc.

[0248] An electronic device may include one or more of the following components: a processing component, a memory, a power component, a multimedia component, an audio component, an input / output I / O interface, a sensor component, and a communication component.

[0249] The processing component generally controls the overall operation of the electronic device, such as operations associated with display, data communication, and recording operations. The processing component may include one or more processors to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component may include one or more modules to facilitate interaction between the processing component and other components. For example, the processing component may include a multimedia module to facilitate interaction between the multimedia component and the processing component.

[0250] The memory is configured to store various types of data to support the operation of the electronic device. Examples of such data include instructions for any application or method operating on the electronic device, contact data, phone book data, messages, pictures, videos, etc. The memory 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 memory, flash memory, magnetic disk or optical disk.

[0251] The power supply assembly provides power to various components of the electronic device. The power supply assembly may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the electronic device.

[0252] The multimedia component includes a screen that provides an output interface between the electronic device and the user. In some embodiments, the screen may include a liquid crystal display LCD and a touch panel TP. If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component includes a front camera and / or a rear camera. When the electronic device is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom power.

[0253] The audio component is configured to output and / or input audio signals. For example, the audio component includes a microphone MIC, and when the electronic device is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in a memory or sent via a communication component. In some embodiments, the audio component also includes a speaker for outputting an audio signal.

[0254] The I / O interface provides an interface between the processing component and the peripheral interface module, which may be a keyboard, a click wheel, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0255] The sensor assembly includes one or more sensors for providing various aspects of status assessment for the electronic device. For example, the sensor assembly can detect the on / off state of the electronic device, the relative positioning of components, such as the display and keypad of the electronic device, and the sensor assembly can also detect the position change of the electronic device or a component of the electronic device, the presence or absence of user contact with the electronic device, the orientation or acceleration / deceleration of the electronic device and the temperature change of the electronic device. The sensor assembly may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor or a temperature sensor.

[0256] The communication component is configured to facilitate wired or wireless communication between the electronic device and other devices. The electronic device can access a wireless network based on a communication standard, such as WiFi, 4G or 5G, or a combination thereof. In an exemplary embodiment, the communication component receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component also includes a near field communication NFC module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification RFID technology, infrared data association IrDA technology, ultra-wideband UWB technology, Bluetooth BT technology and other technologies.

[0257] In an exemplary embodiment, the electronic device may 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 components to perform the above methods.

[0258] Example 7

[0259] A seventh embodiment of the present invention provides a computer-readable storage medium, such as a memory including instructions, wherein the instructions can be executed by a processor of an electronic device to perform the above method. For example, the computer-readable storage medium can be a ROM, a random access memory RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0260] A computer-readable storage medium, when the instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform the above-mentioned ammonia injection flow control method, the method comprising:

[0261] Obtaining a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate;

[0262] The target ammonia flow rate corresponding to the current flue gas flow rate is determined according to the target corresponding relationship.

[0263] Determine the target ammonia flow rate corresponding to the current flue gas flow rate, including,

[0264] According to the target corresponding relationship, the target ammonia flow rate corresponding to the current flue gas flow rate is controlled by adjusting the current flue gas flow rate.

[0265] The target corresponding relationship between the flue gas flow velocity and the ammonia flow rate is obtained by setting the nozzle structure 100;

[0266] The nozzle structure 100 includes a tube body 101 with a through opening inside, a stopper 102 inserted into the through opening, an elastic member 103 connected to one end of the stopper 102, and a force plate 104 connected to the other end of the stopper 102;

[0267] When the smoke flows through the force-bearing disk 104 at a first flow rate, the force-bearing disk 104 can overcome the pulling force of the elastic member 103 and pull the limiting block 102 to move in the opening to determine the opening area of ​​the opening and the ammonia flow rate passing through the opening.

[0268] Obtain the target correspondence between the flue gas flow velocity and the ammonia flow rate, including,

[0269] Obtaining a first corresponding relationship between the flow velocity of the smoke and the magnitude of the force on the force-bearing disk 104;

[0270] Obtaining a second corresponding relationship between the magnitude of the force on the force-bearing disk 104 and the opening area of ​​the through opening;

[0271] A third corresponding relationship between the opening area of ​​the through port and the ammonia flow rate is obtained.

[0272] A target corresponding relationship is determined according to the first corresponding relationship, the second corresponding relationship and the third corresponding relationship.

[0273] Obtaining a first corresponding relationship between the flue gas flow velocity and the force-bearing disk 104 includes:

[0274] Obtain multiple flue gas flow rates;

[0275] According to a plurality of smoke flow velocities and turbulence models, the force magnitude of the force-bearing disk 104 corresponding to each smoke flow velocity is obtained;

[0276] The first corresponding relationship is determined according to a plurality of smoke flow velocities and the magnitude of the force on the force-bearing disk 104 corresponding to each smoke flow velocity.

[0277] According to multiple smoke flow velocities and turbulence models, the force magnitude of the force-bearing disk 104 corresponding to each smoke flow velocity is obtained, including:

[0278] For any of the multiple smoke flow velocities, any of the smoke flow velocities is used as an input of the turbulence model to obtain a pressure output value of the force-bearing disk 104 corresponding to the current smoke flow velocity;

[0279] The corresponding force magnitude of the force disk 104 is determined according to the pressure output value of the force disk 104 and the preset fourth corresponding relationship, wherein the preset fourth corresponding relationship is a linear relationship between the pressure output value of the force disk 104 and the corresponding force magnitude of the force disk 104 .

[0280] Obtaining a second corresponding relationship between the magnitude of the force on the force-bearing disk 104 and the opening area of ​​the through hole includes:

[0281] Obtaining a fifth corresponding relationship between the magnitude of the force on the force-bearing disk 104 and the elastic member 103;

[0282] Obtaining a sixth corresponding relationship between the elastic member 103 and the opening area of ​​the through opening, wherein the fifth corresponding relationship and the sixth corresponding relationship are linear relationships;

[0283] A second corresponding relationship is determined according to the fifth corresponding relationship and the sixth corresponding relationship.

[0284] Obtaining a third corresponding relationship between the opening area of ​​the port and the ammonia flow rate, including:

[0285] Obtaining the opening areas of the plurality of openings and the ammonia flow rate corresponding to the opening area of ​​each opening;

[0286] The third corresponding relationship is determined according to the opening areas of the plurality of openings and the ammonia flow rates corresponding to the opening areas of the respective openings.

[0287] After determining the target ammonia flow rate corresponding to the current flue gas flow rate according to the target corresponding relationship, the method further includes:

[0288] The target ammonia injection amount is determined based on the target ammonia flow rate.

[0289] Example 8

[0290] The eighth embodiment of the present invention provides a computer program product, which includes a program code for executing the method provided by the embodiment of the present invention. When the computer program product runs on an electronic device, the program code is used to enable the electronic device to implement the ammonia injection flow control method provided by the embodiment of the present invention.

[0291] When the computer program is executed by the processor, the above functions defined in the system / device of the embodiment of the present invention are performed. According to the embodiment of the present invention, the system, device, module, unit, etc. described above can be implemented by a computer program module.

[0292] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device, a magnetic storage device, etc. In another embodiment, the computer program may also be transmitted and distributed in the form of a signal on a network medium, and downloaded and installed through a communication part, and / or installed from a removable medium. The program code contained in the computer program may be transmitted using any appropriate network medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0293] According to an embodiment of the present invention, the program code for executing the computer program provided by the embodiment of the present invention can be written in any combination of one or more programming languages, specifically, these computing programs can be implemented using high-level process and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, such as Java, C++, python, "C" language or similar programming languages. The program code can be executed completely on the user computing device, partially on the user device, partially on the remote computing device, or completely on the remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a local area network LAN or a wide area network WAN, or can be connected to an external computing device (for example, using an Internet service provider to connect through the Internet).

[0294] Specifically, the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for controlling ammonia injection flow rate, characterized in that: include, Obtaining a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate; The target ammonia flow rate corresponding to the current flue gas flow rate is determined according to the target corresponding relationship.

2. The ammonia injection flow control method according to claim 1, characterized in that: The determining of the target ammonia flow rate corresponding to the current flue gas flow rate includes: According to the target corresponding relationship, the target ammonia flow rate corresponding to the current flue gas flow rate is controlled by adjusting the current flue gas flow rate.

3. The ammonia injection flow control method according to claim 1 or 2, characterized in that: A target corresponding relationship between the flue gas flow velocity and the ammonia flow rate is obtained by setting a nozzle structure (100); The nozzle structure (100) comprises a tube body (101) having a through opening inside, a limit block (102) inserted into the through opening, an elastic member (103) connected to one end of the limit block (102), and a force plate (104) connected to the other end of the limit block (102); When smoke flows through the force-bearing disk (104) at a first flow rate, the force-bearing disk (104) is able to overcome the pulling force of the elastic member (103) and pull the limit block (102) to move in the opening, so as to determine the opening area of ​​the opening and the ammonia flow rate passing through the opening.

4. The ammonia injection flow control method according to claim 3, characterized in that: The obtaining of the target corresponding relationship between the flue gas flow velocity and the ammonia flow rate includes: Obtaining a first corresponding relationship between the flow velocity of the smoke and the magnitude of the force applied to the force-bearing disk (104); Obtaining a second corresponding relationship between the magnitude of the force applied to the force-bearing disk (104) and the opening area of ​​the through hole; Obtaining a third corresponding relationship between the opening area of ​​the through port and the ammonia flow rate; The target corresponding relationship is determined according to the first corresponding relationship, the second corresponding relationship and the third corresponding relationship.

5. The ammonia injection flow control method according to claim 4, characterized in that: The obtaining of a first corresponding relationship between the flue gas flow velocity and the force bearing plate (104) comprises: Obtaining a plurality of flue gas flow rates; Obtaining the magnitude of the force on the force-bearing disk (104) corresponding to each of the flue gas flow velocities according to the plurality of flue gas flow velocities and turbulence models; The first corresponding relationship is determined according to the plurality of smoke flow velocities and the magnitude of the force on the force-bearing disk (104) corresponding to each of the smoke flow velocities.

6. The ammonia injection flow control method according to claim 5, characterized in that: The step of obtaining the force magnitude of the force-bearing disk (104) corresponding to each of the flue gas flow velocities according to the plurality of flue gas flow velocities and turbulence models comprises: For any of the plurality of smoke flow velocities, use any of the smoke flow velocities as an input of the turbulence model to obtain a pressure output value of the force-bearing disk (104) corresponding to the current smoke flow velocity; The corresponding force magnitude of the force-bearing disk (104) is determined according to the pressure output value of the force-bearing disk (104) and a preset fourth corresponding relationship, wherein the preset fourth corresponding relationship is a linear relationship between the pressure output value of the force-bearing disk (104) and the corresponding force magnitude of the force-bearing disk (104).

7. The ammonia injection flow control method according to any one of claims 4 to 6, characterized in that: The step of obtaining a second corresponding relationship between the magnitude of the force applied to the force-bearing disk (104) and the opening area of ​​the through hole comprises: Obtaining a fifth corresponding relationship between the magnitude of the force applied to the force-bearing disk (104) and the elastic member (103); Obtaining a sixth corresponding relationship between the elastic member (103) and the opening area of ​​the through opening, wherein the fifth corresponding relationship and the sixth corresponding relationship are linear relationships; The second corresponding relationship is determined according to the fifth corresponding relationship and the sixth corresponding relationship.

8. The ammonia injection flow control method according to any one of claims 4 to 6, characterized in that: The obtaining of the third corresponding relationship between the opening area of ​​the through port and the ammonia flow rate includes: Obtaining the opening areas of the plurality of through openings and the ammonia flow rate corresponding to the opening area of ​​each through opening; The third corresponding relationship is determined according to the opening areas of the plurality of through-ports and the ammonia flow rate corresponding to the opening area of ​​each through-port.

9. The ammonia injection flow control method according to claim 7, characterized in that: The obtaining of the third corresponding relationship between the opening area of ​​the through port and the ammonia flow rate includes: Obtaining the opening areas of the plurality of through openings and the ammonia flow rate corresponding to the opening area of ​​each through opening; The third corresponding relationship is determined according to the opening areas of the plurality of through-ports and the ammonia flow rate corresponding to the opening area of ​​each through-port.

10. The ammonia injection flow control method according to any one of claims 1, 2, 4 to 6, and 9, characterized in that: After determining the target ammonia flow rate corresponding to the current flue gas flow rate according to the target corresponding relationship, the method further includes: The target ammonia injection amount is determined according to the target ammonia flow rate.

11. A denitration method, characterized in that: include: Get the current flue gas flow rate; Determine a target ammonia flow rate corresponding to the current flue gas flow rate according to the target corresponding relationship, wherein the target corresponding relationship is used to characterize the corresponding relationship between the flue gas flow rate and the ammonia flow rate; Determining a target ammonia injection amount according to the target ammonia flow rate; Ammonia gas of a corresponding target ammonia injection amount is injected into the current flue gas and mixed.

12. An ammonia injection flow control device, characterized in that: include, An acquisition module, used to acquire a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate; as well as, The first determination module is used to determine a target ammonia flow rate corresponding to a current flue gas flow rate according to the target corresponding relationship.

13. The ammonia injection flow control device according to claim 12, characterized in that: Also includes, The second determination module is used to determine a target ammonia injection amount according to the target ammonia flow rate.

14. A denitration device, characterized in that: include, A smoke injection module, used for injecting smoke; An acquisition module, used to acquire a target corresponding relationship between the flue gas flow velocity and the ammonia flow rate; A first determining unit, configured to determine a target ammonia flow rate corresponding to a current flue gas flow velocity according to a target corresponding relationship, wherein the target corresponding relationship is used to characterize a corresponding relationship between the flue gas flow velocity and the ammonia flow rate; A second determining unit, configured to determine a target ammonia injection amount according to the target ammonia flow rate; as well as, The ammonia injection module injects ammonia of a corresponding target injection amount into the current flue gas and mixes it.

15. An electronic device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the ammonia injection flow control method according to claims 1 to 10.

16. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: When the computer program or instruction is executed by a processor, the steps of the ammonia injection flow control method according to claims 1 to 10 are implemented.

17. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the steps of the ammonia injection flow control method according to claims 1 to 10 are implemented.

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