Multi-fluidized bed boiler cooperative control method, equipment and medium

Abstract

The invention discloses a cooperative control method and device for multiple fluidized bed boilers and a medium, and is applied to the field of advanced process control. The method comprises the following steps: acquiring a pressure change rate corresponding to a mother pipe pressure signal; determining a load adjusting instruction corresponding to the boiler according to the pressure change rate and the absolute value, and determining a corresponding load adjusting quantity according to the pressure change rate and boiler performance parameters corresponding to the boiler; and if the absolute value of the second derivative of the pressure change rate is not smaller than a decoupling threshold value in the process that the boiler carries out load adjustment according to the load adjustment instruction and the load adjustment quantity, corresponding air-coal decoupling compensation operation is determined according to the second derivative of the pressure change rate, and cooperative control is carried out based on the air-coal decoupling compensation operation and load adjustment. According to the method, the mother pipe pressure signal belongs to a feedforward signal in the boiler operation process, and compared with post feedback, the response speed is increased, and the response precision is improved. And the air-coal decoupling compensation operation and the load regulation are cooperatively controlled, so that the quality, the safety and the economy are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of advanced process control, in particular to a multi-fluidized bed boiler cooperative control method, device and medium. BACKGROUND

[0002] In the field of thermal power and central heating, multiple fluidized bed boilers are often operated in parallel, and steam is supplied to users through a steam main pipe. Therefore, the main pipe pressure is the core control index, and the stability of the main pipe pressure is directly related to the safety and quality of energy supply.

[0003] Because the boiler system has typical characteristics of multivariable, strong coupling, large inertia and lag, it is a complex controlled object. Therefore, the conventional control scheme based on DCS (Distributed Control System) is generally adopted at present, which can effectively cope with frequent load fluctuations, changes in coal quality and other disturbances, and realize accurate and stable control of the main pipe pressure.

[0004] However, in actual application, the conventional control scheme based on DCS has two specific ways, the first way is to use "one-to-many" control, that is, to use one main pipe pressure PID (Proportion, Integral, Derivative) controller output to command multiple boilers to increase or decrease load, ignoring the differences in characteristics of each boiler; the second way is to manually specify a certain boiler as a "pressure regulating boiler" to undertake the main pressure regulating task, and the remaining boilers operate in fixed load or manual mode. However, the essence of the two ways is "after-the-fact" feedback, which has a serious lag in response and is prone to system oscillation. When the regulating capacity of the "pressure regulating boiler" is exhausted, manual intervention is required, which has low automation level and poor control quality, and the safety and economy need to be improved.

[0005] In view of the above-mentioned technology, it is an urgent problem for those skilled in the art to seek a more intelligent, faster and more accurate cooperative control method and system. SUMMARY

[0006] The purpose of the present application is to provide a multi-fluidized bed boiler cooperative control method, device and medium. It can solve the problems of "after-the-fact" feedback, which has a serious lag in response and is prone to system oscillation, and manual intervention, which has low automation level and poor control quality.

[0007] To solve the above technical problems, the present application provides a multi-fluidized bed boiler cooperative control method, comprising:

[0008] obtaining a pressure change rate corresponding to the main pipe pressure signal;

[0009] determining a load regulating instruction corresponding to the boiler according to the size and absolute value of the pressure change rate, and determining a corresponding load regulating amount according to the pressure change rate and the boiler corresponding to the boiler characteristic parameter;

[0010] If, during the process of load regulation by the boiler according to the load regulation command and load regulation amount, the absolute value of the second derivative of the pressure change rate is not less than the decoupling threshold, then the corresponding air-coal decoupling compensation operation is determined based on the second derivative of the pressure change rate, and the air-coal decoupling compensation operation is used in conjunction with load regulation for coordinated control.

[0011] Preferably, obtaining the pressure change rate corresponding to the main pipe pressure signal includes:

[0012] Obtain the pressure signals of each main tube in a multi-fluidized bed boiler at different times;

[0013] The corresponding pressure change rate is determined based on the pressure signals of each header pipe.

[0014] Preferably, the load adjustment command corresponding to the boiler is determined based on the magnitude and absolute value of the pressure change rate, including:

[0015] When the rate of change of pressure is less than zero and the absolute value of the rate of change of pressure is greater than the first threshold, the load adjustment command represents a load increase adjustment command.

[0016] When the rate of change of pressure is greater than zero and the absolute value of the rate of change of pressure is greater than the second threshold, the load adjustment command represents a load reduction adjustment command.

[0017] Preferably, when the load adjustment command represents an increase in load adjustment command, the boiler with the fastest response speed is adjusted first; when the load adjustment command represents a decrease in load adjustment command, the boiler with the greatest thermal inertia is adjusted first.

[0018] Preferably, the corresponding load adjustment is determined based on the pressure change rate and the boiler's corresponding boiler characteristics, including:

[0019] Obtain the absolute value of the rate of change of pressure;

[0020] Obtain the boiler's corresponding furnace performance parameters;

[0021] Obtain the system gain coefficient corresponding to the multi-fluidized bed boiler;

[0022] Based on the adjustment range formula, determine the absolute value of the pressure change rate, the furnace characteristics parameters, and the load adjustment corresponding to the system gain coefficient;

[0023] The formula for the adjustment range is as follows:

[0024] ;

[0025] in, For the first The load adjustment amount corresponding to each boiler; The system gain coefficient; This is the absolute value of the rate of change of pressure; is the boiler nature parameter corresponding to the i-th boiler. is the boiler nature parameter corresponding to the i-th boiler.

[0026] Preferably, the formula of the boiler nature parameter corresponding to the boiler is:

[0027] ;

[0028] wherein, is the boiler nature parameter corresponding to the i-th boiler; is the fitting coefficient; is the natural base; is the time required for the boiler to actually increase the preset load; is the time required for the boiler to theoretically increase the preset load. Preferably, the corresponding wind-coal decoupling compensation operation is determined according to the second derivative of the pressure change rate, comprising:

[0029] If the second derivative of the pressure change rate is less than zero, the air volume and the coal supply amount are increased in proportion to

[0030] ; wherein,

[0031] , ;

[0032] is the wind volume advance gain coefficient; is the reference wind-coal ratio coefficient; is the absolute value of the second derivative of the pressure change rate; is the second derivative of the pressure change rate. Preferably, the corresponding wind-coal decoupling compensation operation is determined according to the second derivative of the pressure change rate, further comprising:

[0033] If the second derivative of the pressure change rate is greater than zero, the coal supply amount and the air volume are reduced in proportion to

[0034] ; wherein,

[0035] , ;

[0036] is the coal reduction priority gain coefficient; is the reference coal-wind ratio coefficient; is the absolute value of the second derivative of the pressure change rate; is the second derivative of the pressure change rate.

[0037] In another aspect, the present application also provides an electronic device, comprising a memory for storing a computer program;

[0038] ​A processor is configured to execute a computer program to implement the steps of the multi-flowing bed boiler collaborative control method.

[0039] In another aspect, the application also provides a computer readable storage medium, and the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the multi-flowing bed boiler collaborative control method.

[0040] The multi-flowing bed boiler collaborative control method provided by the application is based on the control of the mother pipe pressure signal, and the mother pipe pressure signal is a feedforward signal in the operation of the boiler, that is, the application is a feedforward regulation, thereby improving the response speed compared with the "after the fact" feedback. In the process of boiler regulation, the application fully considers the differences in characteristics of different boilers, that is, the corresponding furnace parameters of different boilers, to improve the regulation accuracy as much as possible, and in addition to the load regulation, the application also adopts the wind-coal decoupling compensation operation and load regulation collaborative control under certain conditions, thereby expanding the use scenarios and use range. In addition, the application is a full-automatic regulation, and compared with manual regulation, the application has high automation level, high control quality, and improved safety and economy. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0042] Figure 1 A flow chart of a multi-flowing bed boiler collaborative control method provided by an embodiment of the application;

[0043] Figure 2 A system core architecture diagram provided by an embodiment of the application;

[0044] Figure 3 A structure diagram of an electronic device provided by another embodiment of the application. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the application will be described clearly and completely in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0046] The core of the application is to provide a multi-flowing bed boiler collaborative control method, device and medium.

[0047] In order for those skilled in the art to better understand the scheme of the present application, the present application is further described in detail below in combination with the drawings and specific embodiments.

[0048] Figure 1 A flow chart of a multi-flow bed boiler collaborative control method provided by the embodiment of the present application is shown in Figure 1 , and includes the following steps:

[0049] S10: Obtain the pressure change rate corresponding to the mother pipe pressure signal.

[0050] In a specific embodiment, when the boilers in the multi-flow bed boiler system are running, the pressure transmitter in the multi-flow bed boiler system obtains the respective mother pipe pressure signals of the mother pipe in the multi-flow bed boiler at different times in real time, and then the differential processor calculates the pressure change rate, the size of which can reflect the stability of the system. When the absolute value of the pressure change rate is small, it means that the current system fluctuation is small; when the absolute value of the pressure change rate is large, it means that the current system fluctuation is large.

[0051] The pressure change rate can be calculated by point-centered difference method, and the calculation formula is: ; wherein, is the pressure change rate; , , , are the mother pipe pressure signals at different times.

[0052] S11: Determine the load adjustment instruction corresponding to the boiler according to the size and absolute value of the pressure change rate, and determine the corresponding load adjustment amount according to the pressure change rate and the furnace property parameters corresponding to the boiler.

[0053] Since the pressure change rate corresponding to the mother pipe pressure signal is determined according to the mother pipe pressure signals at different times, when the pressure change rate is greater than zero, it means that the pressure signal at the current time is less than the pressure signal at the next time, which represents pressure rise, at this time, in order to ensure the stability of the system, the pressure needs to be adjusted downward; when the pressure change rate is less than zero, it means that the pressure signal at the current time is greater than the pressure signal at the next time, which represents pressure drop, at this time, in order to ensure the stability of the system, the pressure needs to be adjusted upward.

[0054] In actual applications, in order to avoid resource waste and frequent adjustment, it is necessary to further combine the fluctuation range to determine whether adjustment is needed. In general, the multi-flow bed boiler is allowed to have certain fluctuations (process fluctuations), that is, when the fluctuations are within a certain interval range, no adjustment is needed; and when the fluctuations exceed the interval range, adjustment is needed. Therefore, the size and absolute value of the pressure change rate are needed to determine the corresponding load adjustment instruction of the boiler, and the corresponding adjustment range (load adjustment amount) is determined based on the pressure change rate and the current adjusted boiler corresponding furnace parameter.

[0055] S12: If the absolute value of the second derivative of the pressure change rate is not less than the decoupling threshold during the load adjustment of the boiler according to the load adjustment instruction and the load adjustment amount, the corresponding wind-coal decoupling compensation operation is determined according to the second derivative of the pressure change rate, and the wind-coal decoupling compensation operation is controlled based on the load adjustment.

[0056] In specific embodiments, if the second derivative of the pressure change rate (that is, the acceleration of the pressure change rate) has a large value, it indicates that the current system has a large waveform speed. At this time, if the boiler is adjusted alone, it is difficult to meet the stability requirement, and therefore the wind-coal decoupling compensation operation is needed to be used for cooperative control adjustment to ensure the stability of the system.

[0057] The multi-flow bed boiler cooperative control method provided in the application is based on the control of the mother pipe pressure signal, and the mother pipe pressure signal is a feedforward signal in the operation of the boiler. Therefore, the application is a feedforward adjustment, thereby improving the response speed compared with "after-the-fact" feedback. In the boiler adjustment process of the application, the specific load adjustment amount fully considers the characteristic differences of different boilers, that is, the corresponding furnace parameters of different boilers, to improve the adjustment accuracy as much as possible. In addition to the self-load adjustment, the wind-coal decoupling compensation operation is used for cooperative control with the load adjustment under certain conditions, thereby expanding the use scenarios and use range. The application is a full-automatic adjustment, and compared with manual adjustment, the application has high automation level, high control quality, and improved safety and economy.

[0058] On the basis of the above embodiments, as a preferred embodiment, the corresponding load adjustment instruction of the boiler is determined according to the size and absolute value of the pressure change rate, comprising:

[0059] When the pressure change rate is less than zero and the absolute value of the pressure change rate is greater than the first threshold, the load adjustment instruction represents a load increase adjustment instruction;

[0060] When the pressure change rate is greater than zero and the absolute value of the pressure change rate is greater than the second threshold, the load adjustment instruction represents a load decrease adjustment instruction.

[0061] In a specific embodiment, when the pressure change rate is less than zero (P < 0) ), it indicates that the pressure signal at the current time is greater than the pressure signal at the next time, which represents a pressure drop, and at the same time, the absolute value of the pressure change rate is greater than a first threshold value (|P| > T1) ), it indicates that the current fluctuation has exceeded the fluctuation allowed range, and the load adjustment instruction represents an increase load adjustment instruction. On this basis, in order to adjust as soon as possible, the boiler with the fastest response speed in the system is preferentially selected for adjustment. The reason for preferentially selecting the boiler with the fastest response speed for adjustment is that when the load is increased (which can also be understood as the load is increased), the steam gap needs to be filled quickly, so the most additional steam needs to be contributed in the shortest time, so the boiler with the fastest response speed is preferentially selected for adjustment.

[0062] When the pressure change rate is greater than zero (P > 0) ), it indicates that the pressure signal at the current time is less than the pressure signal at the next time, which represents a pressure rise, and at the same time, the absolute value of the pressure change rate is greater than a second threshold value (|P| > T2) ), it indicates that the current fluctuation has exceeded the fluctuation allowed range, and the load adjustment instruction represents a decrease load adjustment instruction. On this basis, in order to adjust as soon as possible, the boiler with the largest thermal inertia in the system is preferentially selected for adjustment. The reason for preferentially selecting the boiler with the largest thermal inertia for adjustment is that when the load is decreased (which can also be understood as the load is decreased), a smooth transition is needed, and the steam output of the boiler with small thermal inertia will decrease sharply when the load is quickly decreased, so from the perspective of stability, the boiler with the largest thermal inertia should be adjusted first.

[0063] In this adjustment process, the first threshold value (T1) is calculated by the following formula:

[0064] ;

[0065] Correspondingly, the second threshold value (T2) is calculated by the following formula:

[0066] ;

[0067] Wherein, is the total load rate of the system; is the coal quality heat value deviation (the difference between the actual heat value and the standard coal heat value); is the standard coal heat value; , , and are fitting coefficients.

[0068] In addition, if the pressure change rate is equal to zero (P = 0) If the pressure signal is equal to the pressure signal at the next moment, it means that the pressure signal is not fluctuating and the system remains stable. Therefore, no action is required at this time.

[0069] It is easy to understand at this point that, after determining whether to adjust the load or reduce it, in order to ensure the stability of the system, it is necessary to further determine the adjustment range. That is, the specific implementation method for determining the corresponding load adjustment amount based on the pressure change rate and the boiler's corresponding boiler characteristics is as follows:

[0070] Obtain the absolute value of the rate of change of pressure;

[0071] Obtain the boiler's corresponding furnace performance parameters;

[0072] Obtain the system gain coefficient corresponding to the multi-fluidized bed boiler;

[0073] Based on the adjustment range formula, determine the absolute value of the pressure change rate, the furnace characteristics parameters, and the load adjustment corresponding to the system gain coefficient;

[0074] The formula for the adjustment range is as follows:

[0075] ;

[0076] in, For the first The load adjustment amount corresponding to each boiler; The system gain coefficient; This is the absolute value of the rate of change of pressure; For the first The boiler performance parameters corresponding to each boiler.

[0077] The formula for the boiler's corresponding furnace performance parameters is as follows:

[0078] ;

[0079] in, For the first The boiler performance parameters corresponding to each boiler; These are the fitting coefficients; The base is the natural number; The time required for the boiler to actually reach the preset load; The time required for the boiler to theoretically reach its preset load.

[0080] Furthermore, the time required for its boiler to theoretically reach the preset load. The calculation formula is:

[0081] ;

[0082] in, For the bed material quality, according to the air chamber pressure to calculate; For the bed material specific heat (take 1.15 kJ / kg·K); For the combustion efficiency, calculated by the boiler positive balance or negative balance; For the coal calorific value.

[0083] It should be noted that the embodiments provided in the present application are only one way that can be implemented, but are not limited to only this way. Users can set it up according to their needs.

[0084] The present application provides a method for determining the corresponding load adjustment instruction of the boiler according to the size and absolute value of the pressure change rate, and determining the corresponding load adjustment amount according to the pressure change rate and the corresponding furnace property parameters of the boiler. In the method, the process fluctuations encountered during the use of the multi-fluidized bed boiler system and the characteristics of the boiler are fully considered, so as to ensure the fastest speed to realize stable adjustment. At the same time, under the cooperation of the formula, the specific adjustment amplitude can be determined exactly, further ensuring the stability after adjustment.

[0085] On the basis of the above-mentioned embodiments, as a preferred embodiment, the specific implementation mode of the corresponding wind-coal decoupling compensation operation is determined according to the second derivative of the pressure change rate as follows:

[0086] If the second derivative of the pressure change rate is less than zero, the wind quantity and the coal quantity are increased in proportion to ;

[0087] Wherein, , ;

[0088] The wind quantity lead gain coefficient is The reference wind-coal ratio coefficient is The absolute value of the second derivative of the pressure change rate is The second derivative of the pressure change rate is

[0089] If the second derivative of the pressure change rate is greater than zero, the coal quantity and the wind quantity are reduced in proportion to ;

[0090] Wherein, , ;

[0091] The coal reduction priority gain coefficient is The reference coal wind ratio coefficient is The absolute value of the second derivative of the pressure change rate is The second derivative of the pressure change rate is

[0092] In specific embodiments, in the process of determining the implementation of the corresponding wind-coal decoupling compensation operation according to the second derivative of the pressure change rate, there is a judgment condition, that is, only when the absolute value of the second derivative of the pressure change rate is greater than a third threshold , that is, when the fluctuation is intense, the subsequent wind-coal decoupling compensation operation is performed, that is, the speed of the coal feeder and the air volume of the fan are quickly adjusted to control the stability of the system. The main reason is to avoid resource waste caused by frequent wind-coal decoupling compensation operations.

[0093] The third threshold is calculated by the following formula:

[0094]

[0095] Among them, is the total load rate of the system; is the calorific value deviation of the coal entering the furnace (the difference between the actual calorific value and the calorific value of standard coal); is the calorific value of standard coal; , is the fitting coefficient.

[0096] In the process of implementing the wind-coal decoupling compensation operation, when the second derivative of the pressure change rate is less than zero ( ), the air volume and the coal supply amount are increased by a proportion ; and when the second derivative of the pressure change rate is greater than zero ( ), the coal supply amount and the air volume are reduced by a proportion .

[0097] As can be seen from the above, the system core architecture diagram of the multi-fluidized bed boiler collaborative control method is as shown in Figure 2 , which includes a pressure transmitter 101, a differential processor 102, an adaptive threshold module 103, a response coefficient module 104, a dynamic distributor 105, an actuator array 106, a coal feeder frequency converter 107, a fan frequency converter 108, and multiple parallel running fluidized bed boilers 109.

[0098] Among them, the pressure transmitter 101 is used to obtain the pressure signal; the differential processor 102 is used to calculate the pressure change rate , the absolute value of the pressure change rate , the second derivative of the pressure change rate (acceleration) , and the absolute value of the second derivative of the pressure change rate ; the adaptive threshold module 103 is used to calculate the first threshold , the second threshold , and the third threshold ; the response coefficient module 104 is used to calculate the furnace property parameter ; the dynamic distributor 105 is used to determine the implementation of the corresponding wind-coal decoupling compensation operation according to the threshold (the first threshold​ , a second threshold value , and a third threshold value ) and furnace parameters determining load adjustment instructions and load adjustment amounts; the actuator array 106 is used to issue the load adjustment instructions and load adjustment amounts to the coal feeder frequency converter 107 and the fan frequency converter 108, thereby forming a complete closed-loop control system to achieve advanced, accurate, and coordinated control of the main pipe pressure.

[0099] Based on this, the complete process of the multi-flow bed boiler coordinated control method is as follows:

[0100] Step 1: Start.

[0101] Step 2: Collect the main pipe pressure signal.

[0102] Step 3: Calculate the pressure change rate and the acceleration of the pressure change rate .

[0103] Step 4: Determine the direction of .

[0104] Step 5: If , the pressure is falling, and at , the load of the boiler with the largest thermal inertia is preferably reduced.

[0105] Step 6: If , the pressure is rising, and at , the load is preferably distributed to the boiler with the fastest response.

[0106] Step 7: Determine .

[0107] Step 8: If yes, at , the coal supply and air volume are reduced in proportion to ; at , the air volume and coal supply are increased in proportion to ; if not, go to Step 9.

[0108] Step 9: The actuator array performs the adjustment operation.

[0109] Step 10: End.

[0110] Since Steps 1-10 are a summary of the above embodiments, this application will not be repeated here.

[0111] It can be seen that the multi-flow boiler collaborative control method provided by the application is based on the control of the mother pipe pressure signal, and the mother pipe pressure signal is a feedforward signal in the operation of the boiler. Therefore, the application is a feedforward regulation, thereby improving the response speed compared with the "after-the-fact" feedback. In the process of boiler regulation, the specific load regulation amount of the application fully considers the characteristic differences of different boilers, that is, the corresponding furnace characteristic parameters of different boilers, to improve the regulation accuracy as much as possible. In addition to the load regulation, the application also adopts wind-coal decoupling compensation operation and load regulation collaborative control under certain conditions, thereby expanding the use scenarios and range. In addition, the application is a full-automatic regulation, and compared with manual regulation, the application has high automation level, high control quality, and improved safety and economy.

[0112] Figure 3 The structural diagram of the electronic device provided by another embodiment of the application is shown in Figure 3 The electronic device includes a memory 20 for storing a computer program.

[0113] A processor 21 is configured to execute the computer program to implement the steps of the multi-flow boiler collaborative control method mentioned in the above embodiments.

[0114] The electronic device provided by the embodiment can include, but is not limited to, a smartphone, a tablet computer, a notebook computer, or a desktop computer, etc.

[0115] The processor 21 can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 can be implemented in at least one of a hardware form of a digital signal processor (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 21 can also include a main processor and a coprocessor. The main processor is a processor for processing data in a wake-up state, also known as a central processing unit (CPU). The coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 21 can be integrated with a graphics processing unit (GPU) that is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 21 can also include an artificial intelligence (AI) processor that is configured to process machine learning-related computing operations.

[0116] The memory 20 can include one or more computer-readable storage media that can be non-transitory. The memory 20 can also include high-speed random access memory and nonvolatile, computer-readable storage media such as one or more magnetic disk storage devices, flash memory devices. In this embodiment, the memory 20 is used at least to store the following computer program 201, wherein the computer program is loaded and executed by the processor 21, and can implement the related steps of the multi-flow fluidized bed boiler collaborative control method disclosed in any of the foregoing embodiments. In addition, the resources stored by the memory 20 can also include an operating system 202 and data 203, etc., and the storage mode can be temporary storage or permanent storage. The operating system 202 can include Windows, Unix, Linux, etc.

[0117] In some embodiments, the electronic device can further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0118] Those skilled in the art can understand that the structure shown in the above embodiments does not constitute a limitation on the electronic device, and can include more or fewer components than those shown in the figure. Figure 3

[0119] The electronic device provided by the embodiments of the present application includes a memory and a processor, and the processor can implement the above-mentioned multi-flow fluidized bed boiler collaborative control method when executing the program stored in the memory, and has the same beneficial effects.

[0120] Finally, the present application also provides an embodiment of a computer-readable storage medium. The computer-readable storage medium stores a computer program, and the computer program is executed by the processor to implement the steps described in the above method embodiments.

[0121] It can be understood that if the method in the above embodiments is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and executes all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0122] ​The above describes in detail the multi-flowing bed boiler collaborative control method, device and medium provided by the present application. The embodiments in the specification are described in a progressive manner, and each embodiment mainly explains the difference from other embodiments. The same or similar parts of each embodiment can be understood by referring to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be understood by referring to the method part. It should be pointed out that for ordinary skilled persons in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0123] It should also be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A method for coordinated control of multi-fluidized bed boilers, characterized in that, include: Obtain the pressure change rate corresponding to the main pipe pressure signal; The load adjustment command corresponding to the boiler is determined based on the magnitude and absolute value of the pressure change rate, and the corresponding load adjustment amount is determined based on the pressure change rate and the boiler's corresponding boiler characteristics parameters. If, during the process of the boiler adjusting the load according to the load adjustment command and the load adjustment amount, the absolute value of the second derivative of the pressure change rate is not less than the decoupling threshold, then the corresponding air-coal decoupling compensation operation is determined based on the second derivative of the pressure change rate, and the air-coal decoupling compensation operation is used in conjunction with the load adjustment for coordinated control.

2. The multi-fluidized bed boiler collaborative control method according to claim 1, characterized in that, The acquisition of the pressure change rate corresponding to the main pipe pressure signal includes: Obtain the pressure signals of each main tube in the multi-fluidized bed boiler at different times; The corresponding pressure change rate is determined based on the pressure signals of each of the main pipes.

3. The multi-fluidized bed boiler collaborative control method according to claim 1, characterized in that, The step of determining the corresponding load adjustment command for the boiler based on the magnitude and absolute value of the pressure change rate includes: When the pressure change rate is less than zero and the absolute value of the pressure change rate is greater than a first threshold, the load adjustment command represents a load increase adjustment command. When the pressure change rate is greater than zero and the absolute value of the pressure change rate is greater than the second threshold, the load adjustment command represents a load reduction adjustment command.

4. The multi-fluidized bed boiler collaborative control method according to claim 3, characterized in that, When the load adjustment command represents the load increase adjustment command, the boiler with the fastest response speed is adjusted first; when the load adjustment command represents the load decrease adjustment command, the boiler with the greatest thermal inertia is adjusted first.

5. The multi-fluidized bed boiler collaborative control method according to claim 1, characterized in that, Determining the corresponding load adjustment based on the pressure change rate and the boiler's corresponding boiler performance parameters includes: Obtain the absolute value of the pressure change rate; Obtain the boiler performance parameters corresponding to the boiler; Obtain the system gain coefficient corresponding to the multi-fluidized bed boiler; Based on the adjustment range formula, determine the absolute value of the pressure change rate, the furnace characteristics parameter, and the load adjustment amount corresponding to the system gain coefficient; The formula for the adjustment range is as follows: ； in, For the first The load adjustment amount corresponding to each of the aforementioned boilers; The system gain coefficient; The absolute value of the rate of change of pressure; For the first The boiler performance parameters corresponding to each boiler.

6. The multi-fluidized bed boiler collaborative control method according to claim 5, characterized in that, The formula for the boiler performance parameters is as follows: ； in, For the first The boiler performance parameters corresponding to each of the aforementioned boilers; These are the fitting coefficients; The base is the natural number; The time required for the boiler to actually reach the preset load; The time required for the boiler to theoretically reach the preset load.

7. The multi-fluidized bed boiler collaborative control method according to any one of claims 1-6, characterized in that, The corresponding air-coal decoupling compensation operation is determined based on the second derivative of the pressure change rate, including: If the second derivative of the pressure change rate is less than zero, then according to the proportion Increase air volume and coal feed rate; in, , ; This refers to the air volume lead gain coefficient. The benchmark air-coal ratio coefficient; The absolute value of the second derivative of the rate of change of pressure; is the second derivative of the pressure change rate.

8. The multi-fluidized bed boiler collaborative control method according to claim 7, characterized in that, The process of determining the corresponding air-coal decoupling compensation operation based on the second derivative of the pressure change rate also includes: If the second derivative of the pressure change rate is greater than zero, then according to the proportion Reduce the coal feed rate and the air volume; in, , ; This is the gain coefficient for prioritizing coal reduction; The benchmark coal-to-air ratio coefficient; The absolute value of the second derivative of the rate of change of pressure; is the second derivative of the pressure change rate.

9. An electronic device, characterized in that, Includes memory used to store computer programs; A processor is configured to execute the computer program to implement the steps of the multi-fluidized bed boiler collaborative control method as described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the multi-fluidized bed boiler collaborative control method as described in any one of claims 1 to 8.

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