Induced draft fan regulation feedforward setting method and system adaptive to grading regulation system

Abstract

The invention discloses an induced draft fan regulation feedforward setting method and system adaptive to a grading regulation system, and relates to the field of automatic control, and the method comprises the steps that a performance curve of an induced draft fan is analyzed, and the performance curve full opening degree of the induced draft fan is provided; the draught fan pressure output corresponding to the flow of the draught fan mapped on the opening line under the BMCR working condition is provided; outputting a feedforward reference parameter of the fan; and obtaining a feed-forward difference value according to the difference between the preset feed-forward parameter and the feed-forward reference parameter, and transmitting the feed-forward difference value to the DCS system to complete feed-forward dynamic conversion at different rotating speeds. According to the method, in a fan gear adjusting system, accurate automatic control feedforward parameters of the induced draft fan can be calculated according to the performance ratio of the air feeder to the induced draft fan, dynamic stepless switching of the feedforward parameters of the induced draft fan is achieved in different gears and among the gears, and the automatic control of the induced draft fan is achieved. And the problem that the output nonlinearity of the induced draft fan at different rotating speeds is reduced is solved.

Description

Technical Field

[0001] The present invention relates to the field of automatic control, and specifically to a method and system for setting the feedforward of a forced draft fan adapted to a step regulation system. Background Art

[0002] At present, most forced draft fans in domestic power plants adopt a speed regulation operation mode. To avoid accidents of resonance damage to equipment during the speed regulation operation mode of the forced draft fan, the transformation of the step regulation system has become a standard configuration for the speed regulation operation of the forced draft fan.

[0003] During the implementation of the step regulation system, the moving blades of the forced draft fan fully regulate and control the negative pressure of the boiler furnace. The speed of the forced draft fan is switched by external condition triggers at different stage gears. In general settings, the FeedForword of the blade PID regulation parameters of the forced draft fan is set by taking the average value of the regulation commands of two induced draft fans and then multiplying by a certain coefficient. This coefficient can be approximately understood as the output ratio of the forced draft fan and the induced draft fan. Thermal power plants generally adopt the PID control method, using the feedforward quantity as the coarse adjustment parameter and then performing fine adjustment through proportional integral and differential. Currently, for the setting of the feedforward quantity of multiple parameters, the on-site test method is basically adopted, that is, a tentative feedforward value is given in advance through experience, and then the final feedforward parameters are gradually determined through a large number of thermal state disturbance tests. For the step regulation system, the feedforward requirements for each speed of the equipment to be regulated are different. Although the on-site test method can also determine the feedforward parameters, it requires a large number of on-site repeated tests, and the finally determined parameters may deviate greatly from the initial setting values. The thermal state disturbance test is also accompanied by certain accident risks. Summary of the Invention

[0004] To solve the above technical problems, a method for setting the feedforward of a forced draft fan adapted to a step regulation system is proposed, including analyzing the performance curve of the forced draft fan and proposing the full opening degree of the performance curve of the forced draft fan;

[0005] Analyzing the design performance and performance curve of the forced draft fan under the BMCR condition, and proposing the fan pressure output corresponding to the induced draft fan flow mapped on the opening line under the BMCR condition;

[0006] Obtaining the corresponding full opening degree of the curve and the fan pressure output corresponding to the induced draft fan flow mapped on the opening line under the BMCR condition according to different speeds;

[0007] Outputting the feedforward reference parameter of the fan according to the mutual relationship between the design pressure of the induced draft fan under the BMCR condition and the fan pressure output corresponding to the opening line;

[0008] Obtaining the feedforward difference by subtracting the preset feedforward parameter from the feedforward reference parameter,

[0009] Transmit the feedforward difference to the DCS system to complete the feedforward dynamic conversion at different speeds.

[0010] As a preferred embodiment of the method for setting the feedforward of the induced draft fan adapting to the stepped adjustment system of the present invention, wherein: analyzing the performance curve of the induced draft fan, it is proposed that the full opening degree of the performance curve of the induced draft fan is based on the performance curve of the induced draft fan at the rated speed, and the maximum opening degree on the curve is selected;

[0011] The curve opening degree after reducing the threshold based on the maximum opening degree is used as the reference opening degree.

[0012] As a preferred embodiment of the method for setting the feedforward of the induced draft fan adapting to the stepped adjustment system of the present invention, wherein: analyzing the design performance and performance curve of the induced draft fan under the BMCR condition, it is proposed that the fan pressure output corresponding to the induced draft fan flow mapped on the opening degree line under the BMCR condition includes,

[0013] According to the flow rate of the induced draft fan under the BMCR condition, in the performance curve of the fan at the rated speed, compare to obtain the fan pressure output of the induced draft fan at the reference opening degree.

[0014] As a preferred embodiment of the method for setting the feedforward of the induced draft fan adapting to the stepped adjustment system of the present invention, wherein: according to the mutual relationship between the design pressure of the forced draft fan under the BMCR condition and the fan pressure output corresponding to the opening degree line, the preset feedforward parameters of the fan output include,

[0015] Compare the pressure value of the design parameters of the forced draft fan under the BMCR condition with the fan pressure output of the induced draft fan at the reference opening degree to obtain the feedforward of the PID adjustment of the induced draft fan blade to the forced draft fan at the rated speed.

[0016] As a preferred embodiment of the method for setting the feedforward of the induced draft fan adapting to the stepped adjustment system of the present invention, wherein: according to the corresponding full opening degree of the curve obtained at different speeds and the fan pressure output corresponding to the induced draft fan flow mapped on the opening degree line under the BMCR condition, it includes,

[0017] Under different speed conditions, select the maximum opening degree and the reference opening degree according to the corresponding performance curve, clarify the fan pressure output corresponding to the reference opening degree on the performance curve of the induced draft fan, compare the pressure value of the design parameters corresponding to the BMCR condition of the forced draft fan with the fan pressure output of the induced draft fan at the reference opening degree, and output the feedforward of the PID adjustment of the induced draft fan blade to the forced draft fan at the corresponding speed.

[0018] As a preferred embodiment of the method for setting the feedforward of the induced draft fan adapting to the stepped adjustment system of the present invention, wherein: transmitting the feedforward difference parameter to the DCS system to complete the feedforward dynamic conversion at different speeds includes,

[0019] Set the feedforward reference parameter. At the rated speed, set the feedforward reference parameter to the ratio of the pressure output of the forced draft fan under the BMCR condition to the pressure output of the induced draft fan at the rated speed of the induced draft fan under the reference opening degree.

[0020] Obtain a feedforward reference parameter at the rated speed, obtain corresponding feedforward reference parameters at several speeds, obtain the feedforward parameters at different speeds, perform a difference operation on the feedforward parameters at each speed and the feedforward reference parameter to obtain the feedforward difference parameter, and then set the feedforward difference parameters at different speeds as a piecewise function with the speed as the variable to complete the feedforward difference switching at different speeds.

[0021] Another object of the present invention is to provide an induced draft fan regulation feedforward setting system adapted to a stepped regulation system, which can work in cooperation with multiple modules and solves the problems in the prior art that the regulation of the induced draft fan depends on fixed feedforward parameters and cannot adapt to the dynamic changes of stepped speeds.

[0022] To solve the above technical problems, the present invention provides the following technical solution: An induced draft fan regulation feedforward setting system adapted to a stepped regulation system, including: a performance curve analysis module, a BMCR condition mapping module, a multi-speed feedforward parameter generation module, and a feedforward dynamic conversion module;

[0023] The performance curve analysis module analyzes the performance curve of the induced draft fan at the rated speed, determines the maximum opening value, and generates a reference opening degree by reducing the maximum opening threshold;

[0024] The BMCR condition mapping module maps the flow rate of the induced draft fan under the BMCR condition to the reference opening degree line in the rated speed performance curve, determines the corresponding fan pressure output, and combines the BMCR design pressure value of the forced draft fan to generate the feedforward reference parameter at the rated speed;

[0025] The multi-speed feedforward parameter generation module dynamically adjusts the maximum opening degree and the reference opening degree of the performance curve for different speeds, calculates the pressure output of the induced draft fan corresponding to the BMCR condition at each speed, and compares it with the design pressure of the forced draft fan to output the feedforward parameters at different speeds;

[0026] The feedforward dynamic conversion module performs a difference calculation on the feedforward reference parameter at the rated speed and the feedforward parameters at each speed to generate a feedforward difference parameter, converts the difference parameter into a piecewise function with the speed as the variable, and transmits it to the DCS system to achieve dynamic switching.

[0027] A computer device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the above-mentioned method for setting the feedforward of the induced draft fan regulation adapted to the stepped regulation system.

[0028] A computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned method for setting the feedforward of the induced draft fan of an adaptive grading adjustment system are implemented.

[0029] Advantages of the present invention: In the fan grading adjustment system of the present invention, more accurate feedforward parameters for automatic control of the induced draft fan can be calculated according to the performance ratio of the forced draft fan and the induced draft fan, and dynamic stepless switching of the feedforward parameters of the induced draft fan can be achieved among different gears and between gears, and the problem of non-linear reduction of the output of the induced draft fan at different speeds can be solved. At present, this method has been successfully applied in several domestic power plants, and the operation effect is good. During the gear switching, the negative pressure fluctuation is extremely small, and the unit operation is relatively stable. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings according to these drawings without creative efforts.

[0031] Figure 1 It is the overall flowchart of the method for setting the feedforward of the induced draft fan of an adaptive grading adjustment system provided by the first embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the fan performance curve at the rated speed in the method for setting the feedforward of the induced draft fan of an adaptive grading adjustment system provided by the first embodiment of the present invention;

[0033] Figure 3 It is for the method for setting the feedforward of the induced draft fan of an adaptive grading adjustment system provided by the first embodiment of the present invention at n x Schematic diagram of the fan performance curve at the rotational speed;

[0034] Figure 4 It is the logic diagram of the feedforward implementation of the induced draft fan blades in the method for setting the feedforward of the induced draft fan of an adaptive grading adjustment system provided by the second embodiment of the present invention.

[0035] Figure 5 It is the experimental data effect diagram in the method for setting the feedforward of the induced draft fan of an adaptive grading adjustment system provided by the second embodiment of the present invention. Detailed Embodiments

[0036] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0037] Example 1, referring to Figures 1 to 3 This is an embodiment of the present invention, which provides a method for setting the feedforward of the induced draft fan adapted to the step adjustment system, including:

[0038] Analyze the performance curve of the induced draft fan and propose the full opening degree of the performance curve of the induced draft fan;

[0039] Analyze the designed performance and the performance curve of the induced draft fan under the BMCR condition, and propose the fan pressure output corresponding to the flow rate of the induced draft fan mapped on the opening degree line under the BMCR condition;

[0040] Obtain the corresponding full opening degree of the curve and the fan pressure output corresponding to the flow rate of the induced draft fan mapped on the opening degree line under the BMCR condition according to different rotational speeds;

[0041] Output the feedforward reference parameter of the fan according to the mutual relationship between the designed pressure of the forced draft fan under the BMCR condition and the fan pressure output corresponding to the opening degree line;

[0042] Obtain the feedforward difference by subtracting the preset feedforward parameter from the feedforward reference parameter,

[0043] Transmit the feedforward difference to the DCS system to complete the feedforward dynamic conversion at different rotational speeds.

[0044] According to the performance curve of the induced draft fan at the rated rotational speed n e Select the maximum opening degree K max on the curve, and reduce the curve opening degree by 4 degrees as the reference opening degree, defined as K' max .

[0045] According to the flow rate Q Figure 1 of the induced draft fan under the BMCR condition (the BMCR point in the design parameters of the induced draft fan BMCR condition), compare the pressure output P' bmcr of the induced draft fan at the opening degree of K' max in the performance curve of the fan at the rated rotational speed. bmcr .

[0046] Through the pressure value P bmcr,FDF of the design parameter of the forced draft fan under the BMCR condition, and the pressure output P' max of the induced draft fan at the opening degree of K' bmcrIn comparison, the feedforward of the induced draft fan blade PID regulation for the forced draft fan at the rated speed can be obtained. That is, FFne = P bmcr,FDF / P 'bmcr .

[0047] When the fan speed drops to n1, according to the performance curve of the fan at n1, the maximum opening K max,1 The curve opening reduced by 4 degrees is used as the reference opening at the n1 speed and is defined as K' max,1 .

[0048] At the n x speed, the corresponding K' max,1 opening on the performance curve of the induced draft fan And according to the K' max,1 opening on the performance curve, the pressure output P' bmcr,1 of the induced draft fan is obtained

[0049] By comparing the pressure value P bmcr,FDF of the forced draft fan BMCR operating condition design parameters with the pressure output P' max，1 of the induced draft fan at the K' bmcr,1 opening, the feedforward of the induced draft fan blade PID regulation for the forced draft fan at the n1 speed can be obtained. That is, FF1 = P bmcr,FDF / P' bmcr,1 .

[0050] Similarly, when the fan speed drops to n x , according to the performance curve of the fan at n x , the maximum opening K max,x The curve opening reduced by 4 degrees is used as the reference opening at the n x speed and is defined as K' max,x .

[0051] At the n x speed, the corresponding K' max,x opening on the performance curve of the induced draft fan And according to the K' max,x opening on the performance curve, the pressure output P' bmcr,x of the induced draft fan is obtained

[0052] By comparing the pressure value P bmcr,PDF of the forced draft fan BMCR operating condition design parameters with the pressure output P' max,x of the induced draft fan at the K' bmcr,x opening, the feedforward of the induced draft fan blade PID regulation for the forced draft fan at the n x speed can be obtained. That is, FFx = P bmcr,FDF / P' bmcr,x .

[0053] During the implementation process, an FF can be sete The reference value, for example, at the rated speed, set the FFe reference value to the ratio of the pressure output of the forced draft fan under the BMCR condition to the pressure output P' of the induced draft fan at the rated speed of the induced draft fan at the K' max opening. Then, the FF1 value at the n1 speed is the ratio of the pressure output of the forced draft fan under the BMCR condition to the pressure output P' of the induced draft fan at the K' bmcr opening at the n1 speed of the induced draft fan. And so on, the FF1... FF max，1 values at the speeds of n1... n bmcr，1 can be obtained. Finally, to achieve different feedforward values according to different speeds, it is realized by subtracting the difference ΔFF between the FF x value at different speeds from the FF X reference value. The specific expression of ΔFF is the FF e at different speeds minus the FF x reference value. Then, set n e and ΔFF as a piecewise function with the speed nx as the variable to realize the switching of the feedforward difference at different speeds. x -FF e . Then, set n x and ΔFF as a piecewise function with the speed nx as the variable to realize the switching of the feedforward difference at different speeds.

[0054] Embodiment 2 is an embodiment of the present invention, which provides a system for the feedforward setting method of the induced draft fan adapting to the stepped adjustment system, including: a performance curve analysis module, a BMCR condition mapping module, a multi-speed feedforward parameter generation module, and a feedforward dynamic conversion module;

[0055] The performance curve analysis module analyzes the performance curve of the induced draft fan at the rated speed, determines the maximum opening value, and generates a reference opening by reducing the maximum opening threshold;

[0056] The BMCR condition mapping module maps the flow rate of the induced draft fan under the BMCR condition to the reference opening line in the rated speed performance curve, determines the corresponding fan pressure output, and combines with the BMCR design pressure value of the forced draft fan to generate the feedforward reference parameter at the rated speed;

[0057] The multi-speed feedforward parameter generation module dynamically adjusts the maximum opening and the reference opening of the performance curve for different speeds, calculates the pressure output of the induced draft fan corresponding to the BMCR condition at each speed, and compares it with the design pressure of the forced draft fan to output the feedforward parameters at different speeds;

[0058] The feedforward dynamic conversion module calculates the difference between the feedforward reference parameter at the rated speed and the feedforward parameters at each speed to generate a feedforward difference parameter, converts the difference parameter into a piecewise function with the speed as the variable, and transmits it to the DCS system to achieve dynamic switching.

[0059] If the above-mentioned functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, etc., which can store program codes of various kinds.

[0060] The logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a predefined sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or in combination with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in combination with an instruction execution system, apparatus, or device.

[0061] More specific examples (a non-exhaustive list) of computer-readable media include the following: electrical connection parts with one or more wirings (electronic devices), portable computer disk cartridges (magnetic devices), random access memories (RAMs), read-only memories (ROMs), erasable programmable read-only memories (EPROMs or flash memories), optical fiber devices, and portable compact disc read-only memories (CDROMs). Additionally, a computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, then editing, interpreting, or otherwise processing it as appropriate, and then storing it in a computer memory.

[0062] It should be understood that each part of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0063] Example 3, referring to Figures 4 to 5 This is the fourth embodiment of the present invention. To verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments. In this embodiment, experiments are respectively conducted on the existing traditional method and the method of this embodiment.

[0064] Referring to Figure 4 , 1 and 2 are the blade opening degrees of two air supply fans in the feedforward system. Specifically, 1 is the blade opening degree of air supply fan A, and 2 is the blade opening degree of air supply fan B. 3 is an average function block. After the data of 1 and 2 are input, the average of 1 and 2 is taken and output to 10. 4 is the pre-reference parameter, which is a constant value, namely FFe.

[0065] Blocks 5, 6, 7, 8, and 9 are input / switching blocks for feedforward changes.

[0066] 5 is the input value of the speed change, and the change value of the speed is input into the piecewise function block 8.

[0067] 6 is a zero value block, which is used to set the feedforward difference to zero after the feedforward change value exits.

[0068] 7 is a function switch, which can be set to 1 or 0. When set to 1, the feedforward change function is enabled; when set to 0, the feedforward change function is disabled.

[0069] 8 is a piecewise function function of the feedforward change value based on the speed. The specific analysis is as follows, where the x-axis is the change amount of the speed and the y-axis is the change amount of △FF. The graph is as Figure 5 shown. The changing trend is approximately an exponential function.

[0070] When x1 = 0, y1 = 0; when x1 = n1, y1 = P bmcr,FDF / P' bmcr,1 -P bmcr,FDF / P' bmcr

[0071] When x2 = n2, y2 = P bmcr,FDF / P' bmcr,2 -P bmcr,FDF / P' bmcr

[0072] When x x = n x , y x = P bmcr,FDF / P' bmcr,x -P bmcr,FDF / P' bmcr

[0073] 9 is the input block for realizing the function. When the input of 7 is 1, the output of 9 is the output of 8. When the input of 7 is 0, the output of 9 is the value of 6, which is 0.

[0074] 10 is the multiplication function block. The output value of 3, that is, the average value of the blade opening of the blower, is multiplied by the output value of 11, and 12 is output.

[0075] 11 is the difference function block. The output value of 9 is subtracted from 4 and then output to 10.

[0076] 12 is the output of the whole function, that is, the feedforward output of the induced draft fan.

[0077] The blade openings HAI3 and HAI4 of the blower are averaged by the STAT6 statistical function block and then enter the ADD8 function block for addition operation. The gain coefficient is set as FFne in the addition block as the feedforward parameter value for the blade adjustment of the induced draft fan at the rated speed.

[0078] The X2 pin in the ADD8 function block is the dynamic feedforward value switched according to the speed. When the gear system of the HDI10 block is not put into operation, the output of the ASEL9 block is 0, indicating that when the gear system is not put into operation, the dynamic feedforward value does not respond. When the gear system of the HDI10 block is put into operation, the output of the ASEL9 block is the output value of the FX13 piecewise function block. The FX13 function block is the feedforward difference for the blade adjustment of the induced draft fan judged according to the set value of the current speed. That is, ΔFF. The specific expression of the FX13 function block is:

[0079] When x1 = 0, y1 = 0. When x1 = n1, y1 = P bmcr,FDF / P' bmcr,1 -P bmcr,FDF / P' bmcr

[0080] When x2 = n2, y2 = P bmcr,FDF / P' bmcr,2 -P bmcr,FDF / P' bmcr ,

[0081] When x x = n x , y x = Pbmcr,FDF / P' bmcr,x -P bmcr,FDF / P' bmcr 。

[0082] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A method for setting the feedforward adjustment of a induced draft fan adapted to a grading adjustment system, characterized in that, Including: Analyze the performance curve of the induced draft fan and propose the full opening degree of the performance curve of the induced draft fan. Analyze the designed performance and performance curve of the induced draft fan under the BMCR condition, and propose the fan pressure output corresponding to the induced draft fan flow mapped on the opening degree line under the BMCR condition. Obtain the corresponding full opening degree of the curve and the fan pressure output corresponding to the induced draft fan flow mapped on the opening degree line under the BMCR condition according to different speeds. Output the feedforward reference parameter of the fan according to the mutual relationship between the designed pressure of the forced draft fan under the BMCR condition and the fan pressure output corresponding to the opening degree line. Obtain the feedforward difference by taking the difference between the preset feedforward parameter and the feedforward reference parameter. Transmit the feedforward difference to the DCS system to complete the feedforward dynamic conversion at different speeds.

2. The method for setting the feedforward of the induced draft fan adapting to the step adjustment system according to claim 1, characterized in that: The analysis of the performance curve of the induced draft fan and the proposal of the full opening degree of the performance curve of the induced draft fan are based on the performance curve of the induced draft fan at the rated speed, and the maximum opening degree on the curve is selected. The curve opening degree after reducing the threshold based on the maximum opening degree is used as the reference opening degree.

3. The method for setting the feedforward of the induced draft fan adapting to the stepped adjustment system according to claim 2, characterized in that: The analysis of the designed performance and performance curve of the induced draft fan under the BMCR condition and the proposal of the fan pressure output corresponding to the induced draft fan flow mapped on the opening degree line under the BMCR condition include: According to the flow of the induced draft fan under the BMCR condition, compare the fan pressure output of the induced draft fan at the reference opening degree in the performance curve of the fan at the rated speed.

4. The method for setting the feedforward of the induced draft fan adapting to the step adjustment system according to claim 3, wherein: The output of the preset feedforward parameter of the fan according to the mutual relationship between the designed pressure of the forced draft fan under the BMCR condition and the fan pressure output corresponding to the opening degree line includes: Compare the pressure value of the designed parameter of the forced draft fan under the BMCR condition with the fan pressure output of the induced draft fan at the reference opening degree to obtain the feedforward of the PID adjustment of the induced draft fan blade to the forced draft fan at the rated speed.

5. A method for setting the feedforward of the induced draft fan adjusting the adaptation grading regulation system according to claim 4, characterized in that: The obtaining of the corresponding full opening degree of the curve and the fan pressure output corresponding to the induced draft fan flow mapped on the opening degree line under the BMCR condition according to different speeds includes: Under different speed conditions, select the maximum opening degree and the reference opening degree according to the corresponding performance curve, clarify the fan pressure output corresponding to the reference opening degree on the performance curve of the induced draft fan, compare the pressure value of the designed parameter corresponding to the BMCR condition of the forced draft fan with the fan pressure output of the induced draft fan at the reference opening degree, and output the feedforward of the PID adjustment of the induced draft fan blade to the forced draft fan at the corresponding speed.

6. The feedforward setting method for the induced draft fan regulation of an adaptation grading regulation system as described in claim 5, characterized in that: The transmission of the feedforward difference parameter to the DCS system to complete the feedforward dynamic conversion at different speeds includes: Set the feedforward reference parameter. At the rated speed, set the feedforward reference parameter as the ratio of the pressure output of the forced draft fan under the BMCR condition to the fan pressure output of the induced draft fan at the reference opening degree at the rated speed of the induced draft fan. Obtain a feedforward reference parameter at the rated speed, obtain corresponding feedforward reference parameters at several speeds, obtain the feedforward parameters at different speeds, perform a difference operation between the feedforward parameters at each speed and the feedforward reference parameter to obtain the feedforward difference parameter, and then set the feedforward difference parameters at different speeds as a piecewise function with the speed as the variable to complete the feedforward difference switching at different speeds.

7. A system for a regulating feedforward setting method of a forced draft fan adopting an adaptation grading and regulating system as described in any one of claims 1 to 6, characterized in that: Including a performance curve analysis module, a BMCR condition mapping module, a multi-speed feedforward parameter generation module, and a feedforward dynamic conversion module. The performance curve analysis module analyzes the performance curve of the induced draft fan at the rated speed, determines the maximum opening value, and generates a reference opening by reducing the maximum opening threshold; The BMCR condition mapping module maps the induced draft fan flow rate under the BMCR condition to the reference opening line in the rated speed performance curve, determines the corresponding fan pressure output, and combines it with the BMCR design pressure value of the forced draft fan to generate the feedforward reference parameter at the rated speed; The multi-speed feedforward parameter generation module dynamically adjusts the maximum opening and reference opening of the performance curve for different speeds, calculates the induced draft fan pressure output corresponding to the BMCR condition at each speed, compares it with the forced draft fan design pressure, and outputs the feedforward parameters for different speeds; The feedforward dynamic conversion module calculates the difference between the feedforward reference parameter at the rated speed and the feedforward parameters at each speed to generate a feedforward difference parameter, converts the difference parameter into a piecewise function with speed as the variable, and transmits it to the DCS system for dynamic switching.

8. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of a method for setting the feedforward of the induced draft fan for an adaptive grading adjustment system according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of a method for setting the feedforward of the induced draft fan for an adaptive grading adjustment system according to any one of claims 1 to 6.

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