Ammonia water spraying flow control method and control system for flue gas denitration

Abstract

The embodiment of the invention provides an ammonia water spraying flow control method and system for flue gas denitration, and belongs to the field of flue gas denitration. The ammonia water spraying flow control method comprises the following steps: constructing an ammonia spraying control multi-objective function according to a plurality of input parameters at an inlet of a flue gas denitration device and a plurality of output parameters at an outlet of the flue gas denitration device; according to the ammonia spraying control multi-objective function, the target ammonia water adding amount when the numerical value of the ammonia spraying control multi-objective function is minimum is obtained. According to the ammonia water spraying flow control method provided by the embodiment of the invention, the accuracy of controlling the ammonia water spraying amount can be improved, so that the risk of high ammonia escape rate or poor denitration effect is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas denitrification, and in particular to an ammonia water spray flow control method for flue gas denitrification, an ammonia water spray flow control system for flue gas denitrification, an electronic device, a computer-readable storage medium and a computer program product. Background Art

[0002] In order to prevent excessive nitrogen oxides from polluting the environment after coal combustion in the boiler, the coal should be denitrated. In the field of flue gas denitrification, the selective catalytic reduction method is widely used to denitrify coal. The selective catalytic reduction method is a mature and effective process. Too little ammonia spraying flow will cause the nitrogen oxides in the sintering flue gas to react with ammonia, resulting in residual nitrogen oxides in the sintering flue gas, resulting in low denitrification efficiency and excessive nitrogen oxide emissions. Excessive ammonia spraying will cause excess ammonia consumed in the reduction reaction, increase the ammonia escape rate, and sulfur trioxide in the sintering flue gas will react with ammonia and water to form ammonium bisulfate. Ammonium bisulfate is corrosive and sticky, which will cause catalyst blockage, resulting in poor denitrification effect.

[0003] In order to avoid poor denitration effect caused by too little or too much ammonia spraying flow, it is very important to control the ammonia spraying flow. The prior art uses PID control algorithm to control the ammonia spraying flow. However, the ammonia spraying flow adjustment process is affected by multiple variables, and the control accuracy of the ammonia spraying flow controlled by the PID control algorithm is low. Therefore, the present invention aims to improve the control accuracy of the ammonia spraying amount to avoid a large ammonia escape rate caused by too much ammonia spraying or a poor denitration effect caused by too little ammonia spraying. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide an ammonia water spray flow control method for flue gas denitrification, an ammonia water spray flow control system for flue gas denitrification, an electronic device, a computer-readable storage medium and a computer program product. The ammonia water spray flow control method for flue gas denitrification can partially or completely solve the technical problem that it is difficult to accurately control the ammonia water spraying amount in the prior art, thereby resulting in a large ammonia escape rate due to excessive spraying of ammonia water, or a poor denitrification effect due to too little spraying.

[0005] In order to achieve the above-mentioned objectives, in a first aspect, an embodiment of the present invention provides an ammonia water spray flow control method for flue gas denitrification, comprising: constructing an ammonia spray control multi-objective function according to multiple input parameters at the inlet of the flue gas denitrification device and multiple output parameters at the outlet of the flue gas denitrification device; and according to the ammonia spray control multi-objective function, obtaining the target ammonia water addition amount when the value of the ammonia spray control multi-objective function is minimum.

[0006] Optionally, the multiple input parameters include: the concentration of ammonia water injection, the initial amount of ammonia water added, the flue gas volume, the input concentration of nitrogen oxides, and the make-up air volume at the current moment; the multiple output parameters include: the concentration of ammonia water outlet and the initial outflow of ammonia water, and the output concentration of nitrogen oxides. The construction of the ammonia injection control multi-objective function based on the multiple input parameters at the inlet of the flue gas denitrification device and the multiple output parameters at the outlet of the flue gas denitrification device includes: obtaining the flue gas volume after make-up air based on the flue gas volume and the make-up air volume at the current moment; constructing an ammonia escape target function based on the initial amount of ammonia water added, the initial outflow of ammonia water and the flue gas volume after make-up air; constructing an ammonia water addition target function based on the flue gas volume after make-up air, the input concentration of nitrogen oxides and the output concentration of nitrogen oxides; and constructing an ammonia injection control multi-objective function based on the ammonia escape target function and the ammonia water addition target function.

[0007] Optionally, constructing an ammonia escape target function according to the initial amount of ammonia water added, the initial amount of ammonia water outflow, and the amount of flue gas after air supplementation includes: constructing an ammonia escape target function f1(t) according to the following formula: G' y (t) = G y +G b (t), where Indicates the initial amount of ammonia added, represents the initial outflow of ammonia water, G y is the flue gas volume; G' y (t) represents the amount of smoke after air supply, G b (t) indicates the current air supply volume.

[0008] Optionally, constructing the ammonia addition amount objective function according to the flue gas volume after air supplementation, the input concentration of nitrogen oxides and the output concentration of nitrogen oxides includes: constructing the ammonia addition amount objective function according to the following formula:

[0009] in, represents the input concentration of nitrogen oxides, It represents the output concentration of nitrogen oxides, and η represents the mass ratio of ammonia nitrogen.

[0010] Optionally, constructing an ammonia injection control multi-objective function according to the ammonia slip objective function and the ammonia water addition amount objective function includes: constructing an ammonia injection control multi-objective function Z according to the following formula:

[0011]

[0012] Optionally, according to the ammonia injection control multi-objective function, obtaining the target ammonia addition amount when the value of the ammonia injection control multi-objective function is minimized includes: optimizing the ammonia injection control multi-objective function using the Gray Wolf optimization algorithm to obtain the optimized flue gas volume after air supplementation corresponding to the ammonia escape objective function when the value of the ammonia injection control multi-objective function is minimized; using the optimized flue gas volume after air supplementation, obtaining the ammonia addition amount corresponding to the ammonia addition amount objective function; and determining the ammonia addition amount corresponding to the ammonia addition amount objective function as the target ammonia addition amount.

[0013] In a second aspect, the present invention also provides an ammonia water spray flow control system for flue gas denitrification, the ammonia water spray flow control system comprising: a construction module for constructing an ammonia spray control multi-objective function according to a plurality of input parameters at the inlet of the flue gas denitrification device and a plurality of output parameters at the outlet of the flue gas denitrification device; and an acquisition module for acquiring, according to the ammonia spray control multi-objective function, a target ammonia water addition amount when the value of the ammonia spray control multi-objective function is minimum.

[0014] Optionally, the multiple input parameters include: the concentration of ammonia water injection, the initial amount of ammonia water added, the flue gas volume, the input concentration of nitrogen oxides, and the make-up air volume at the current moment; the multiple output parameters include: the concentration of ammonia water outlet and the initial outflow of ammonia water, and the output concentration of nitrogen oxides; the construction module is used to construct an ammonia injection control multi-objective function according to the multiple input parameters at the inlet of the flue gas denitrification device and the multiple output parameters at the outlet of the flue gas denitrification device, including: the construction of the ammonia injection control multi-objective function according to the multiple input parameters at the inlet of the flue gas denitrification device and the multiple output parameters at the outlet of the flue gas denitrification device includes: according to the flue gas volume and the make-up air volume at the current moment, obtaining the flue gas volume after make-up air; constructing an ammonia escape target function according to the initial amount of ammonia water added, the initial outflow of ammonia water and the flue gas volume after make-up air; constructing an ammonia water addition target function according to the flue gas volume after make-up air, the input concentration of nitrogen oxides and the output concentration of nitrogen oxides; and constructing an ammonia injection control multi-objective function according to the ammonia escape target function and the ammonia water addition target function.

[0015] Optionally, constructing an ammonia escape target function according to the initial amount of ammonia water added, the initial amount of ammonia water outflow, and the amount of flue gas after air supplementation includes: constructing an ammonia escape target function f1(t) according to the following formula: G' y (t) = G y +G b (t), where Indicates the initial amount of ammonia added, represents the initial outflow of ammonia water, G y is the flue gas volume; G'y (t) represents the amount of smoke after air supply, G b (t) indicates the current air supply volume.

[0016] Optionally, constructing the ammonia addition amount objective function according to the flue gas volume after air supplementation, the input concentration of nitrogen oxides and the output concentration of nitrogen oxides includes: constructing the ammonia addition amount objective function according to the following formula:

[0017] in, represents the input concentration of nitrogen oxides, It represents the output concentration of nitrogen oxides, and η represents the mass ratio of ammonia nitrogen.

[0018] Optionally, constructing an ammonia injection control multi-objective function according to the ammonia slip objective function and the ammonia water addition amount objective function includes: constructing an ammonia injection control multi-objective function Z according to the following formula:

[0019]

[0020] Optionally, the acquisition module is used to obtain the target ammonia addition amount when the value of the ammonia injection control multi-objective function is minimized according to the ammonia injection control multi-objective function, including: optimizing the ammonia injection control multi-objective function using the Gray Wolf optimization algorithm to obtain the optimized flue gas volume after air supplementation corresponding to the ammonia escape objective function when the value of the ammonia injection control multi-objective function is minimized; using the optimized flue gas volume after air supplementation to obtain the ammonia addition amount corresponding to the ammonia addition amount objective function; and determining the ammonia addition amount corresponding to the ammonia addition amount objective function as the target ammonia addition amount.

[0021] In a third aspect, the present invention also provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the ammonia spray flow control method for flue gas denitrification as described.

[0022] In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer execution instructions, and when the computer execution instructions are executed by a processor, they are used to implement the ammonia water spray flow control method for flue gas denitrification as described above.

[0023] In a fifth aspect, the present invention further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the ammonia water spray flow control method for flue gas denitrification as described above.

[0024] Through the above technical scheme, the present invention provides an ammonia water spray flow control method for flue gas denitrification, including: constructing an ammonia spray control multi-objective function according to multiple input parameters at the inlet of the flue gas denitrification device and multiple output parameters at the outlet of the flue gas denitrification device; and obtaining the target ammonia water addition amount when the value of the ammonia spray control multi-objective function is minimized according to the ammonia spray control multi-objective function. The embodiment of the present invention constructs an ammonia spray control multi-objective function by obtaining the input parameters at the inlet of the flue gas denitrification device and the output parameters at the outlet, and determines the ammonia water addition amount when the value of the ammonia spray control multi-objective function is minimized, and the ammonia water addition amount is the target ammonia water addition amount. The ammonia water spray flow control method provided by the embodiment of the present invention can improve the accuracy of controlling the ammonia water spray amount, thereby reducing the risk of a large ammonia escape rate or poor denitrification effect.

[0025] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0027] Figure 1 is a flow chart of an ammonia water spraying flow control method provided by a first embodiment of the present invention;

[0028] Figure 2 It is a flue gas denitrification device commonly used in the prior art;

[0029] Figure 3 is a flow chart of a control process of amine fugitive emission provided by a first embodiment of the present invention;

[0030] Figure 4 It is a structural diagram of an ammonia water spray flow control system provided by the second embodiment of the present invention. DETAILED DESCRIPTION

[0031] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0032] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of national laws and regulations. In the embodiments of this application, some existing solutions in the industry such as certain software, components, and models may be mentioned, which should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of this application, but it does not mean that the applicant has or will necessarily use the solution.

[0033] like Figure 1 The flow chart of a method for controlling the flow rate of ammonia water spraying for flue gas denitrification provided by the first embodiment of the present invention is as follows: A method for controlling the flow rate of ammonia water spraying for flue gas denitrification comprises the following steps S10-S11.

[0034] In step S10, a multi-objective function of ammonia injection control is constructed according to a plurality of input parameters at the inlet of the flue gas denitrification device and a plurality of output parameters at the outlet of the flue gas denitrification device.

[0035] Furthermore, the multiple input parameters include: the concentration of ammonia water injection, the initial amount of ammonia water added, the flue gas volume, the input concentration of nitrogen oxides, and the current air supply volume, and the multiple output parameters include: the concentration of ammonia water outlet and the initial outflow of ammonia water, and the output concentration of nitrogen oxides. The construction of the ammonia injection control multi-objective function based on the multiple input parameters at the inlet of the flue gas denitrification device and the multiple output parameters at the outlet of the flue gas denitrification device includes steps S101-S104.

[0036] The embodiment of the present invention is applicable to a method for controlling the amount of ammonia water sprayed in a flue gas denitrification device, such as Figure 2 It is a commonly used flue gas denitrification device in the prior art, including a raw flue gas nitrogen oxide concentration detection device, an outlet flue gas nitrogen oxide concentration detection device, a flue gas flow detection device, an ammonia concentration detection device, a reactor temperature detection device, an ammonia injection flow detection device and a pump connected to the central processor. The flue gas nitrogen oxide concentration detection device, the outlet flue gas nitrogen oxide concentration detection device, the flue gas flow detection device, the reactor temperature detection device, the ammonia escape concentration detection device and the ammonia injection flow detection device are used to monitor the component content of the flue gas.

[0037] At the inlet of the flue gas denitrification device, the flue gas volume is obtained according to the original flue gas inlet flow detection device, and the current air supply volume (i.e. the real-time air supply volume, the detection device is not shown in the figure) is obtained at the same time. The input concentration of nitrogen oxides is obtained according to the original flue gas nitrogen oxide concentration detection device, the initial amount of ammonia added is obtained according to the ammonia flow detection device, the concentration of ammonia injection and the concentration of ammonia outlet are obtained according to the ammonia concentration detection device (not shown in the figure), and the flue gas nitrogen oxide concentration detection device at the outlet is used to obtain the output concentration of nitrogen oxides.

[0038] In step S101, the smoke volume after supplementary air is obtained according to the smoke volume and the supplementary air volume at the current moment.

[0039] For example, after obtaining the flue gas volume G y The current air supply volume G b (t), according to G' y (t) = Gy +G b (t) Get the flue gas volume G' after air supply y (t).

[0040] In step S102, an ammonia escape objective function is constructed according to the initial amount of ammonia solution added, the initial amount of ammonia solution flowing out, and the amount of flue gas after air supplementation.

[0041] Furthermore, constructing an ammonia escape target function according to the initial amount of ammonia water added, the initial amount of ammonia water outflow, and the amount of flue gas after air supplementation includes: constructing an ammonia escape target function f1(t) according to the following formula: G' y (t) = G y +G b (t), where Indicates the initial amount of ammonia added, represents the initial outflow of ammonia water, G y is the flue gas volume; G' y (t) represents the amount of smoke after air supply, G b (t) indicates the supply air volume at the current moment.

[0042] For example, after obtaining the initial amount of ammonia added The unit is kg / h; initial outflow of ammonia water And the flue gas volume after air supply G b (t), the unit of smoke volume is m 3 / h; construct the ammonia escape objective function f1(t). In the initial state, a reasonable initial amount of ammonia water can be given based on experience. In the initial state, the ratio of ammonia water to nitric oxide and nitrogen dioxide is 3:1:1, so that the initial outflow of ammonia water can be detected. Similarly, the flue gas volume G is given in the initial state. y , and then after the denitrification treatment begins, the concentration of nitrogen oxides in the flue gas is detected, and it is determined whether it meets or is equal to the emission standard. If it does not meet the standard, the amount of ammonia water added is adjusted until the nitrogen oxides meet the emission standard. Then, the ammonia escape value is detected to see if it meets or is equal to the emission standard. If it does not meet the standard, the amount of ammonia water added needs to be adjusted until the nitrogen oxides meet the emission standard. The embodiment of the present invention is about how to accurately control the amount of ammonia water. The amount of ammonia water added directly affects the amount of ammonia escape. Ammonia escape directly affects whether the ammonia emission meets the standard, affects the environment and the cost of denitrification, so the smaller the ammonia escape, the better. Figure 3 It is a flow chart of the control process of amine fugitive emission provided by the first embodiment of the present invention.

[0043] In step S103, an objective function of the amount of ammonia solution added is constructed according to the amount of flue gas after air supplementation, the input concentration of nitrogen oxides, and the output concentration of nitrogen oxides.

[0044] Furthermore, the objective function of the amount of ammonia added is constructed according to the amount of flue gas after the air supplementation, the input concentration of nitrogen oxides, and the output concentration of nitrogen oxides, including: constructing the objective function of the amount of ammonia added according to the following formula:

[0045] in, represents the input concentration of nitrogen oxides, It represents the output concentration of nitrogen oxides, and η represents the mass ratio of ammonia nitrogen.

[0046] For example, the objective function of the amount of ammonia added is constructed according to the flue gas volume after air supplementation, the input concentration of nitrogen oxides, and the output concentration of nitrogen oxides. The ammonia addition amount objective function is used to determine the target ammonia addition amount according to the denitrification process at the current moment to meet the actual control requirements. Wherein, η represents the ammonia nitrogen mass ratio as a fixed value.

[0047] In step S104, a multi-objective function of ammonia injection control is constructed according to the ammonia slip objective function and the ammonia water addition amount objective function.

[0048] Further, constructing the ammonia injection control multi-objective function according to the ammonia slip objective function and the ammonia water addition amount objective function includes: constructing the ammonia injection control multi-objective function Z according to the following formula:

[0049]

[0050] According to the ammonia slip objective function and the ammonia water addition objective function, an ammonia injection control multi-objective function Z is further constructed. The embodiment of the present invention takes into account both the ammonia slip amount and the ammonia water addition amount, and the ammonia water addition amount directly affects the ammonia slip amount, so the present invention establishes an ammonia injection control multi-objective function.

[0051] In step S11, according to the ammonia injection control multi-objective function, the target amount of ammonia solution added when the value of the ammonia injection control multi-objective function is minimized is obtained.

[0052] Furthermore, according to the ammonia injection control multi-objective function, obtaining the target amount of ammonia solution added when the value of the ammonia injection control multi-objective function is minimum includes the following steps S111-S113.

[0053] In step S111, the gray wolf optimization algorithm is used to optimize the ammonia injection control multi-objective function to obtain the optimized flue gas volume after air supplementation corresponding to the ammonia escape objective function when the value of the ammonia injection control multi-objective function is minimum.

[0054] Exemplarily, since the embodiments of the present invention are designed to involve multiple objective functions, the Gray Wolf Optimization Algorithm suitable for multi-objective functions is preferably used. The embodiments of the present invention include but are not limited to the Gray Wolf Optimization Algorithm. Similar optimization algorithms that can optimize multi-objective functions all fall within the scope of protection of the present invention.

[0055] The objective function Z can be regarded as a cost objective function, and the solution of the ammonia escape objective function is determined to be the smallest when the cost is minimized. The embodiment of the present invention is based on the ammonia escape amount, so when the ammonia escape objective function is minimized, the optimized flue gas volume G' is determined. y The constraints for optimizing the objective function Z are: The initial value of f1 is 8 mg / m 3 , smoke volume constraint: Reaction ammonia dosage balance conditions: is the ammonia outflow, It is a fixed value, which is determined according to the local policy smoke implementation standard, such as 20 mg. It is related to the ammonia valve model. The air supply volume when the valve is opened at the minimum. is the air supply volume when the valve is opened to the maximum; f 1max The standard emission value representing ammonia slip is determined according to the local policy implementation standard. The process of optimizing the objective function Z using the gray wolf optimization algorithm in the embodiment of the present invention can be implemented using existing technology, which will not be described in detail here.

[0056] In step S112, the amount of ammonia solution added corresponding to the ammonia solution addition amount objective function is obtained by using the flue gas volume after the optimization of air supply.

[0057] For example, the amount of smoke after optimizing the air supply is used, and The amount of ammonia added corresponding to the optimal objective function can be determined

[0058] In step S113, the amount of ammonia water added corresponding to the ammonia water addition amount objective function is determined as the target amount of ammonia water added.

[0059] Finally, the objective function is used to adjust the amount of ammonia added to minimize the cost and the amount of ammonia escape.

[0060] Through the above technical scheme, the present invention provides an ammonia water spray flow control method for flue gas denitrification, including: constructing an ammonia spray control multi-objective function according to multiple input parameters at the inlet of the flue gas denitrification device and multiple output parameters at the outlet of the flue gas denitrification device; and obtaining the target ammonia water addition amount when the value of the ammonia spray control multi-objective function is minimized according to the ammonia spray control multi-objective function. The embodiment of the present invention constructs an ammonia spray control multi-objective function by obtaining the input parameters at the inlet of the flue gas denitrification device and the output parameters at the outlet, and determines the ammonia water addition amount when the value of the ammonia spray control multi-objective function is minimized, and the ammonia water addition amount is the target ammonia water addition amount. The ammonia water spray flow control method provided by the embodiment of the present invention can improve the accuracy of controlling the ammonia water spray amount, thereby reducing the risk of a large ammonia escape rate or poor denitrification effect.

[0061] like Figure 4 It is a structural diagram of an ammonia water spraying flow control system for flue gas denitrification provided by the second embodiment of the present invention. An ammonia water spraying flow control system for flue gas denitrification, the ammonia water spraying flow control system 40 comprises: a construction module 401, for constructing an ammonia spraying control multi-objective function according to multiple input parameters at the inlet of the flue gas denitrification device and multiple output parameters at the outlet of the flue gas denitrification device; and an acquisition module 402, for acquiring, according to the ammonia spraying control multi-objective function, a target ammonia water addition amount when the value of the ammonia spraying control multi-objective function is minimum.

[0062] The ammonia water spraying flow control system for flue gas denitrification provided by the second embodiment of the present invention implements the ammonia water spraying flow control method for flue gas denitrification as described above and the technical effects achieved are the same as those of the first embodiment, which will not be repeated here.

[0063] Furthermore, the multiple input parameters include: the concentration of ammonia water injection, the initial amount of ammonia water added, the flue gas volume, the input concentration of nitrogen oxides, and the current air supply volume, and the multiple output parameters include: the concentration of ammonia water outlet and the initial outflow of ammonia water, and the output concentration of nitrogen oxides. The construction module is used to construct the multi-objective function of ammonia injection control according to the multiple input parameters at the inlet of the flue gas denitrification device and the multiple output parameters at the outlet of the flue gas denitrification device, including: obtaining the flue gas volume after air supply according to the flue gas volume and the current air supply volume; constructing the ammonia escape target function according to the initial amount of ammonia water added, the initial outflow of ammonia water, and the flue gas volume after air supply; constructing the ammonia water addition target function according to the flue gas volume after air supply, the input concentration of nitrogen oxides, and the output concentration of nitrogen oxides; and constructing the ammonia injection control multi-objective function according to the ammonia escape target function and the ammonia water addition target function.

[0064] Furthermore, constructing an ammonia escape target function according to the initial amount of ammonia water added, the initial amount of ammonia water outflow, and the amount of flue gas after air supplementation includes: constructing an ammonia escape target function f1(t) according to the following formula: G' y (t) = G y +G b (t), where Indicates the initial amount of ammonia added, represents the initial outflow of ammonia water, G y is the flue gas volume; G' y (t) represents the amount of smoke after air supply, G b (t) indicates the current air supply volume.

[0065] Furthermore, the objective function of the amount of ammonia added is constructed according to the amount of flue gas after the air supplementation, the input concentration of nitrogen oxides, and the output concentration of nitrogen oxides, including: constructing the objective function of the amount of ammonia added according to the following formula:

[0066] in, represents the input concentration of nitrogen oxides, It represents the output concentration of nitrogen oxides, and η represents the mass ratio of ammonia nitrogen.

[0067] Further, constructing the ammonia injection control multi-objective function according to the ammonia slip objective function and the ammonia water addition amount objective function includes: constructing the ammonia injection control multi-objective function Z according to the following formula:

[0068]

[0069] Furthermore, the acquisition module is used to obtain the target ammonia addition amount when the value of the ammonia injection control multi-objective function is minimized based on the ammonia injection control multi-objective function, including: optimizing the ammonia injection control multi-objective function using the Gray Wolf optimization algorithm to obtain the optimized flue gas volume after air supplementation corresponding to the ammonia escape objective function when the value of the ammonia injection control multi-objective function is minimized; obtaining the ammonia addition amount corresponding to the ammonia addition amount objective function using the optimized flue gas volume after air supplementation; and determining the ammonia addition amount corresponding to the ammonia addition amount objective function as the target ammonia addition amount.

[0070] The third embodiment of the present invention also provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the ammonia water spray flow control method for flue gas denitrification as described.

[0071] The electronic device provided in the third embodiment of the present invention implements the ammonia water spray flow control method for flue gas denitrification as described above and the technical effects achieved when executed are the same as those of the first embodiment, and will not be described in detail here.

[0072] The fourth embodiment of the present invention further provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the ammonia water spray flow control method for flue gas denitrification as described above.

[0073] The computer-readable storage medium provided in the fourth embodiment of the present invention implements the ammonia water spray flow control method for flue gas denitrification as described above and the technical effects achieved when executed are the same as those of the first embodiment, and will not be described in detail here.

[0074] The fifth embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the ammonia water spray flow control method for flue gas denitrification as described above.

[0075] The computer program product provided in the fifth embodiment of the present invention implements the ammonia water spray flow control method for flue gas denitrification as described above and the technical effects achieved when executed are the same as those of the first embodiment, and will not be described in detail here.

[0076] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0077] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0078] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0079] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0080] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0081] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0082] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0083] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0084] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for controlling the flow rate of ammonia water spraying for flue gas denitrification, characterized in that: include: Constructing a multi-objective function of ammonia injection control according to a plurality of input parameters at the inlet of the flue gas denitrification device and a plurality of output parameters at the outlet of the flue gas denitrification device; as well as, According to the ammonia injection control multi-objective function, the target amount of ammonia solution added when the value of the ammonia injection control multi-objective function is minimized is obtained.

2. The ammonia water spraying flow control method according to claim 1, characterized in that: in, The multiple input parameters include: the concentration of ammonia solution injected, the initial amount of ammonia solution added, the flue gas volume, the input concentration of nitrogen oxides, and the current air supply volume; the multiple output parameters include: the concentration of ammonia solution outlet and the initial outflow of ammonia solution, the output concentration of nitrogen oxides, The constructing of the ammonia injection control multi-objective function according to the multiple input parameters at the inlet of the flue gas denitrification device and the multiple output parameters at the outlet of the flue gas denitrification device comprises: According to the smoke volume and the current air supply volume, the smoke volume after air supply is obtained; Constructing an ammonia escape objective function according to the initial amount of ammonia solution added, the initial amount of ammonia solution outflow, and the amount of flue gas after air supplementation; According to the flue gas volume after air supplementation, the input concentration of nitrogen oxides and the output concentration of nitrogen oxides, an objective function of the amount of ammonia added is constructed; and, According to the ammonia escape objective function and the ammonia water addition amount objective function, a multi-objective function of ammonia injection control is constructed.

3. The ammonia water spraying flow control method according to claim 2, characterized in that: The constructing of the ammonia escape objective function according to the initial amount of ammonia solution added, the initial amount of ammonia solution flowing out, and the amount of flue gas after air supplementation includes: According to the following formula, the ammonia slip objective function f1(t) is constructed: G' y (t)=G y +G b (t), in, Indicates the initial amount of ammonia added, represents the initial outflow of ammonia water, G y is the flue gas volume; G' y (t) represents the amount of smoke after air supply, G b (t) indicates the supply air volume at the current moment.

4. The ammonia water spraying flow control method according to claim 3, characterized in that: The objective function of the amount of ammonia added is constructed according to the amount of flue gas after air supplementation, the input concentration of nitrogen oxides, and the output concentration of nitrogen oxides, including: According to the following formula, the objective function of ammonia addition is constructed: in, represents the input concentration of nitrogen oxides, It represents the output concentration of nitrogen oxides, and η represents the mass ratio of ammonia nitrogen.

5. The method for controlling the ammonia water spraying flow rate according to claim 4, characterized in that: The multi-objective function of ammonia injection control is constructed according to the ammonia escape objective function and the ammonia water addition amount objective function, including: According to the following formula, the multi-objective function Z of ammonia injection control is constructed:

6. The method for controlling the ammonia water spraying flow rate according to claim 5, characterized in that: The step of obtaining the target amount of ammonia solution added when the value of the ammonia injection control multi-objective function is minimum according to the ammonia injection control multi-objective function comprises: The ammonia injection control multi-objective function is optimized by using the Gray Wolf optimization algorithm to obtain the optimized flue gas volume after air supplementation corresponding to the ammonia escape objective function when the value of the ammonia injection control multi-objective function is the smallest; Using the optimized flue gas volume after air supplementation, obtaining the amount of ammonia water added corresponding to the ammonia water addition amount objective function; and, The amount of ammonia water added corresponding to the ammonia water addition amount objective function is determined as the target amount of ammonia water added.

7. An ammonia water spraying flow control system for flue gas denitrification, characterized in that: The ammonia water spraying flow control system comprises: A construction module, for constructing a multi-objective function of ammonia injection control according to a plurality of input parameters at an inlet of a flue gas denitrification device and a plurality of output parameters at an outlet of the flue gas denitrification device; and An acquisition module is used to acquire, according to the ammonia injection control multi-objective function, a target amount of ammonia solution added when the value of the ammonia injection control multi-objective function is minimum.

8. The ammonia water spraying flow control system according to claim 7, characterized in that: in, The multiple input parameters include: the concentration of ammonia solution injected, the initial amount of ammonia solution added, the flue gas volume, the input concentration of nitrogen oxides, and the current air supply volume; the multiple output parameters include: the concentration of ammonia solution outlet and the initial outflow of ammonia solution, the output concentration of nitrogen oxides, The construction module is used to construct the ammonia injection control multi-objective function according to multiple input parameters at the inlet of the flue gas denitrification device and multiple output parameters at the outlet of the flue gas denitrification device, including: The constructing of the ammonia injection control multi-objective function according to the multiple input parameters at the inlet of the flue gas denitrification device and the multiple output parameters at the outlet of the flue gas denitrification device comprises: According to the flue gas volume and the current air supply volume, the flue gas volume after air supply is obtained; according to the initial amount of ammonia water added, the initial amount of ammonia water outflow and the flue gas volume after air supply, an ammonia escape objective function is constructed; According to the flue gas volume after air supplementation, the input concentration of nitrogen oxides and the output concentration of nitrogen oxides, an objective function of the amount of ammonia added is constructed; and, According to the ammonia escape objective function and the ammonia water addition amount objective function, a multi-objective function of ammonia injection control is constructed.

9. The ammonia water spraying flow control system according to claim 8, characterized in that: The constructing of the ammonia escape objective function according to the initial amount of ammonia solution added, the initial amount of ammonia solution flowing out, and the amount of flue gas after air supplementation includes: According to the following formula, the ammonia slip objective function f1(t) is constructed: in, Indicates the initial amount of ammonia added, represents the initial outflow of ammonia water, G y is the flue gas volume; G' y (t) represents the amount of smoke after air supply, G b (t) indicates the supply air volume at the current moment.

10. The ammonia water spraying flow control system according to claim 9, characterized in that: The objective function of the amount of ammonia added is constructed according to the amount of flue gas after air supplementation, the input concentration of nitrogen oxides, and the output concentration of nitrogen oxides, including: According to the following formula, the objective function of ammonia addition is constructed: in, represents the input concentration of nitrogen oxides, It represents the output concentration of nitrogen oxides, and η represents the mass ratio of ammonia nitrogen.

11. The ammonia water spraying flow control system according to claim 10, characterized in that: The multi-objective function of ammonia injection control is constructed according to the ammonia escape objective function and the ammonia water addition amount objective function, including: According to the following formula, the multi-objective function Z of ammonia injection control is constructed:

12. The ammonia water spraying flow control system according to claim 11, characterized in that: The acquisition module, for acquiring the target amount of ammonia solution added when the value of the ammonia injection control multi-objective function is minimum according to the ammonia injection control multi-objective function, comprises: The ammonia injection control multi-objective function is optimized by using the Gray Wolf optimization algorithm to obtain the optimized flue gas volume after air supplementation corresponding to the ammonia escape objective function when the value of the ammonia injection control multi-objective function is the smallest; Using the optimized flue gas volume after air supplementation, obtaining the amount of ammonia water added corresponding to the ammonia water addition amount objective function; and, The amount of ammonia water added corresponding to the ammonia water addition amount objective function is determined as the target amount of ammonia water added.

13. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the ammonia water spraying flow control method for flue gas denitrification according to any one of claims 1-6.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the ammonia water spraying flow control method for flue gas denitrification according to any one of claims 1 to 6.

15. A computer program product, characterized in that It comprises a computer program, which, when executed by a processor, implements the ammonia water spraying flow control method for flue gas denitrification as described in any one of claims 1 to 6.

Images