CN114001343B - Boiler combustion feedforward control method and device and boiler combustion control system - Google Patents
Boiler combustion feedforward control method and device and boiler combustion control system Download PDFInfo
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- CN114001343B CN114001343B CN202111653337.9A CN202111653337A CN114001343B CN 114001343 B CN114001343 B CN 114001343B CN 202111653337 A CN202111653337 A CN 202111653337A CN 114001343 B CN114001343 B CN 114001343B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
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Abstract
The application provides a boiler combustion feedforward control method, a boiler combustion feedforward control device and a boiler combustion control system, wherein the method comprises the following steps: in the load reduction process of the boiler, when the first current load is judged to be smaller than the first deep load adjustment threshold, the following steps are executed for each detection period: acquiring a second current load amount corresponding to the current detection period; determining a feedforward coefficient corresponding to the second current load amount; the feedforward coefficient is a value which is positively correlated with the second current load quantity and is less than 1; determining a target feedforward quantity corresponding to the load variation according to a feedforward coefficient corresponding to the second current load quantity and a feedforward quantity corresponding to the pre-calculated load variation; and determining a comprehensive feedforward quantity based on the target feedforward quantity, and controlling the boiler combustion by the comprehensive feedforward quantity. The method and the device can avoid great reduction of fuel quantity and/or water supply quantity in the feedforward control process, and achieve the aim of safe operation of the unit during deep adjustment.
Description
Technical Field
The application relates to the technical field of boiler control, in particular to a boiler combustion feedforward control method and device and a boiler combustion control system.
Background
The existing boiler Control depends on a coordinated Control system, the coordinated Control system mainly comprises a boiler main Control part and a steam turbine main Control part, a unit receives a power grid load instruction in an AGC (automatic generation Control) or CCS (Common Channel Signaling) mode, wherein the boiler main Control part automatically calculates instructions such as fuel, water supply, air quantity and the like required under a target load according to logic functions such as load-fuel quantity, fuel quantity-water supply, fuel quantity-air quantity and the like, regulates and controls boiler combustion, and maintains parameters such as main steam pressure, temperature and the like.
Boiler combustion has inertia and to meet speed and quality requirements, an acceleration signal BIR is typically designed into the boiler main control as a feed forward part of the control. When the load instruction or the main steam pressure changes, the feed-forward logic increases or decreases the fuel, the water supply, the air volume and the like required by the boiler combustion in advance, so that the process of boiler load response is accelerated.
Taking 350MW unit of power plant as an example, the load regulation range for normal operation is designed to be 175MW-350MW, and the lowest load of peak regulation planned at present is 40% of unit capacity, namely 140 MW. Thermal power plants in all regions face increasingly difficult deep peak regulation tasks, and safe and stable operation of units under deep regulation working conditions is of great importance, so that higher requirements are provided for a coordinated control system.
A main protection MFT of the boiler is provided with a low water supply flow protection, when the water supply flow is lower than an action value, the boiler trips, an interlocking steam turbine and a generator trip, and a unit set stops running. Under low load, the boiler operates under the working condition that the feed water flow is low, and in the process of deeply regulating and reducing the load, the feed-forward logic can quickly and greatly reduce the fuel quantity and the feed water quantity in advance according to the load variation, at the moment, the reduction and fluctuation of the feed water flow of the boiler have the possibility of triggering protection action, and the lower the load, the greater the danger, and the adverse effect on the unit safety is realized.
Disclosure of Invention
The application aims to provide a boiler combustion feedforward control method, a boiler combustion feedforward control device and a boiler combustion control system, wherein during deep regulation load reduction, a target feedforward quantity corresponding to load variation is determined by setting a feedforward coefficient which is smaller than 1 and positively correlated with the load quantity, so that the fuel quantity and/or the water supply quantity can be prevented from being greatly reduced in a feedforward control process, and the aim of safe operation of a unit during deep regulation can be achieved.
In a first aspect, an embodiment of the present application provides a boiler combustion feedforward control method, including: judging whether the first current load is smaller than a first deep load regulation threshold value or not in the load reduction process of the boiler; if yes, aiming at each detection period, the following steps are executed: acquiring a second current load amount corresponding to the current detection period; determining a feedforward coefficient corresponding to the second current load amount; the feedforward coefficient is a value which is positively correlated with the second current load quantity and is less than 1; determining a target feedforward quantity corresponding to the load variation according to a feedforward coefficient corresponding to the second current load quantity and a feedforward quantity corresponding to the pre-calculated load variation; and determining a comprehensive feedforward quantity based on the target feedforward quantity corresponding to the load variation, and controlling the boiler combustion by using the comprehensive feedforward quantity.
Further, the step of determining the feedforward coefficient corresponding to the second current load amount includes: and calculating the feedforward coefficient corresponding to the second current load according to the second current load, the relation among the load and the feedforward coefficient.
Further, the determination process of the above relation is as follows: when the second current load amount is set as the first deep-adjusting load threshold value, the feedforward coefficient is a first coefficient; when the second current load amount is set as a second deep-adjusting load threshold value, the feedforward coefficient is a second coefficient; wherein the second deep tuning load threshold is smaller than the first deep tuning load threshold; the first coefficient is a value less than or equal to one, and the second coefficient is less than the first coefficient; and determining the slope and intercept of the linear function according to the first deep adjustment load threshold, the second deep adjustment load threshold, the first coefficient and the second coefficient to obtain a relational expression between the load quantity and the feedforward coefficient.
Further, the step of calculating the feedforward coefficient corresponding to the second current load amount according to the relationship among the second current load amount, the load amount, and the feedforward coefficient includes: substituting the second current load amount into a relational expression between the load amount and the feedforward coefficient to obtain the feedforward coefficient corresponding to the second current load amount, wherein the relational expression is as follows:
Y=KX+B；
wherein Y represents a feedforward coefficient, X represents a current load amount, K is a slope, and B is an intercept.
Further, the step of determining the feedforward coefficient corresponding to the second current load amount includes: and searching the feedforward coefficient corresponding to the second current load according to the corresponding relation between the preset load interval and the feedforward coefficient.
Further, the step of determining the target feedforward amount corresponding to the load change amount based on the feedforward coefficient corresponding to the second current load amount and the feedforward amount corresponding to the load change amount calculated in advance includes: and multiplying the target feedforward quantity corresponding to the load variation by the feedforward coefficient to obtain the target feedforward quantity corresponding to the load variation.
Further, the step of determining the integrated feedforward amount based on the target feedforward amount corresponding to the load variation includes: acquiring a feedforward quantity corresponding to a main steam pressure set value and a feedforward quantity corresponding to a main steam pressure difference value; and summing the target feedforward quantity corresponding to the load variation, the feedforward quantity corresponding to the main steam pressure set value and the feedforward quantity corresponding to the main steam pressure difference value to obtain the comprehensive feedforward quantity.
Further, the integrated feedforward amount includes: a fuel quantity feed forward amount and/or a water quantity feed forward amount.
In a second aspect, an embodiment of the present application further provides a boiler combustion feedforward control device, which includes: the judging module is used for judging whether the first current load is smaller than a first deep load regulation threshold value or not in the load reduction process of the boiler; the control module is used for executing the following steps aiming at each detection period when the judgment result of the judgment module is yes: acquiring a second current load amount corresponding to the current detection period; determining a feedforward coefficient corresponding to the second current load amount; the feedforward coefficient is a value which is positively correlated with the second current load quantity and is less than 1; determining a target feedforward quantity corresponding to the load variation according to a feedforward coefficient corresponding to the second current load quantity and a feedforward quantity corresponding to the pre-calculated load variation; and determining a comprehensive feedforward quantity based on the target feedforward quantity corresponding to the load variation, and controlling the boiler combustion by using the target comprehensive feedforward quantity.
In a third aspect, an embodiment of the present application further provides a boiler combustion control system, where the system includes: a boiler main control system and a steam engine main control system; the boiler master control system is adapted to perform the method according to the first aspect.
In a fourth aspect, an embodiment of the present application further provides an electronic device, which includes a processor and a memory, where the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the method according to the first aspect.
In a fifth aspect, embodiments of the present application further provide a computer-readable storage medium storing computer-executable instructions, which, when invoked and executed by a processor, cause the processor to implement the method of the first aspect.
In the boiler combustion feedforward control method, the boiler combustion feedforward control device and the boiler combustion feedforward control system, firstly, in the load reducing process of a boiler, whether a first current load amount is smaller than a first deep load regulation threshold value is judged; if the load is smaller than the first deep-tuning load threshold, namely when the load is judged to enter the deep-tuning load reduction stage, the following steps are executed for each detection period: acquiring a second current load amount corresponding to the current detection period; determining a feedforward coefficient corresponding to the second current load amount; the feedforward coefficient is a value smaller than 1, and the feedforward coefficient is positively correlated with the second current load quantity; that is, as the load amount decreases, the feedforward coefficient also becomes smaller; then determining a target feedforward quantity corresponding to the load variation according to a feedforward coefficient corresponding to the second current load quantity and a feedforward quantity corresponding to the pre-calculated load variation; namely, on the basis of the existing feed-forward quantity of the load variation, a feed-forward coefficient which is smaller than 1 and is continuously reduced along with the reduction of the load quantity is superposed to obtain a target feed-forward quantity corresponding to the load variation, the comprehensive feed-forward quantity is determined on the basis of the target feed-forward quantity corresponding to the load variation, the combustion of the boiler is controlled by the comprehensive feed-forward quantity, the great reduction of the fuel quantity and the water supply quantity in the feed-forward control process can be avoided, and the aim of safe operation of the unit during the deep regulation is achieved.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a boiler combustion feed-forward control method provided by an embodiment of the present application;
fig. 2 is a schematic diagram of a logic for calculating a target load variation according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a target fuel quantity feedforward amount calculation logic provided by an embodiment of the present application;
FIG. 4 is a block diagram of a boiler combustion feedforward control device according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
At present, a boiler combustion feedforward control method is realized by adopting the following modes: a low feed water flow protection is designed in a Main Fuel Trip (MFT) of the boiler, when the feed water flow is lower than an action value, the boiler trips, an interlocking turbine and a generator Trip, and a unit set stops running. In the mode, under the condition of low load, the boiler operates under the working condition that the feed water flow is low, and in the process of deep load adjustment and load reduction (for example, the normal load adjustment range of the unit is 175MW-350MW, the minimum deep load adjustment and load reduction can reach 140 MW), according to the load variation, the feed-forward logic can quickly and greatly reduce the fuel quantity and the feed water quantity in advance, at the moment, the reduction and fluctuation of the feed water flow of the boiler have the possibility of triggering protection actions, and the lower the load, the greater the risk is, so that the safety of the boiler unit is not facilitated.
Based on this, the embodiment of the application provides a boiler combustion feedforward control method, device and system, during the deep-regulation load reduction period, a feedforward coefficient which is smaller than 1 and positively correlated with the load quantity is set to determine the target feedforward quantity corresponding to the load variation, so that the fuel quantity and/or the water supply quantity can be prevented from being greatly reduced in the feedforward control process, and the target of safe operation of a unit during the deep-regulation period is achieved. For the understanding of the present embodiment, a boiler combustion feedforward control method disclosed in the embodiments of the present application will be described in detail first.
FIG. 1 is a flow chart of a boiler combustion feedforward control method provided by an embodiment of the present application, the method including the steps of:
and S102, judging whether the first current load is smaller than a first deep load regulation threshold value or not in the load reduction process of the boiler.
When the load of the boiler is reduced, a deep-adjustment load reduction interval is usually set, and the first deep-adjustment load threshold is an upper limit value of the deep-adjustment load reduction interval, namely a maximum value corresponding to the interval. And in the load reducing process of the boiler, acquiring the current load of the boiler in real time, namely a first current load, and judging whether the first current load is smaller than a first deep-adjustment load threshold value or not so as to judge whether the boiler control enters a deep-adjustment load reducing stage or not.
Step S104, if yes, the following steps are executed for each detection period: when the first current load amount is less than the first deep turn load threshold, it may be determined that the boiler control enters a deep turn load reduction phase. At this point, the following steps may be performed in a loop:
step S1042, a second current load amount corresponding to the current detection period is obtained.
The second current load capacity is the current load capacity detected in real time after entering the deep-adjusting load-reducing stage. The first current load capacity is the current load capacity detected when the deep-adjusting load reduction stage is not entered. "first" and "second" are used only to distinguish the amount of load in different phases.
Step S1044, determining a feedforward coefficient corresponding to the second current load amount; the feedforward coefficient is a value that is positively correlated with the second current load amount and is smaller than 1.
And a corresponding feedforward coefficient is determined for the second current load, the coefficient is a value which is positively correlated with the second current load and is less than 1, the coefficient is multiplied by a feedforward amount corresponding to the load change determined in the prior art, a target feedforward amount corresponding to the load change with a moderate adjustment amplitude can be determined, and a comprehensive feedforward amount is calculated to perform boiler feedforward control based on the target feedforward amount corresponding to the load change, so that the large reduction of the fuel amount and/or the water supply amount in the feedforward control process can be avoided, and the target of safe operation of the unit during the deep adjustment period is achieved. The method comprises the following steps:
and step S1046, determining a target feedforward quantity corresponding to the load variation according to the feedforward coefficient corresponding to the second current load quantity and the feedforward quantity corresponding to the pre-calculated load variation. Specifically, the feedforward amount corresponding to the load variation is multiplied by the feedforward coefficient to obtain the target feedforward amount corresponding to the load variation.
And S1048, determining a comprehensive feedforward quantity based on the target feedforward quantity corresponding to the load variation, and controlling the boiler combustion by the comprehensive feedforward quantity.
In the boiler combustion feedforward control method provided by the embodiment of the application, firstly, in the load reducing process of a boiler, whether a first current load amount is smaller than a first deep load regulation threshold value is judged; if the load is smaller than the first deep-tuning load threshold, namely when the load is judged to enter the deep-tuning load reduction stage, the following steps are executed for each detection period: acquiring a second current load amount corresponding to the current detection period; determining a feedforward coefficient corresponding to the second current load amount; the feedforward coefficient is a value smaller than 1, and the feedforward coefficient is positively correlated with the second current load quantity; that is, as the load amount decreases, the feedforward coefficient also becomes smaller; then determining a target feedforward quantity corresponding to the load variation according to a feedforward coefficient corresponding to the second current load quantity and a feedforward quantity corresponding to the pre-calculated load variation; namely, on the basis of the existing feed-forward quantity of load variation, a feed-forward coefficient which is smaller than 1 and is continuously reduced along with the reduction of the load quantity is superposed to obtain a target feed-forward quantity, a comprehensive feed-forward quantity is determined on the basis of the target feed-forward quantity of the load variation, the combustion of the boiler is controlled by the comprehensive feed-forward quantity, the fuel quantity and the water supply quantity can be prevented from being greatly reduced in the feed-forward control process, and the aim of safe operation of a unit during deep regulation can be achieved.
The embodiment of the application also provides another boiler combustion feedforward control method, which is realized on the basis of the embodiment; the present embodiment focuses on the feedforward coefficient determination process and the boiler feedforward control process.
The determination of the feedforward coefficients can be done in a number of ways. Two ways are listed in the examples of this application:
(1) and searching the feedforward coefficient corresponding to the second current load according to the corresponding relation between the preset load interval and the feedforward coefficient. In this method, feedforward coefficients corresponding to a plurality of load amount intervals are configured in advance, and in which interval the second current load amount falls, the feedforward coefficient corresponding to the interval is determined as the feedforward coefficient corresponding to the second current load amount.
(2) And calculating the feedforward coefficient corresponding to the second current load according to the second current load, the relation among the load and the feedforward coefficient. In this way, a relation is determined in advance, and then the second current load amount is substituted into the relation between the load amount and the feedforward coefficient to obtain the feedforward coefficient corresponding to the second current load amount, where the relation is as follows:
Y=KX+B；
wherein Y represents a feedforward coefficient, X represents a second current load amount, K is a slope, and B is an intercept.
The above relation is determined as follows: when the second current load amount is set as the first deep-adjusting load threshold value, the feedforward coefficient is a first coefficient; when the second current load amount is set as a second deep-adjusting load threshold value, the feedforward coefficient is a second coefficient; wherein the second deep tuning load threshold is smaller than the first deep tuning load threshold; the first coefficient is a value less than or equal to one, and the second coefficient is less than the first coefficient; and determining the slope and intercept of the linear function according to the first deep adjustment load threshold, the second deep adjustment load threshold, the first coefficient and the second coefficient to obtain a relational expression between the load quantity and the feedforward coefficient.
For example, if the deep-tuning load reduction interval is [140MW,175MW ], the first deep-tuning load threshold is 175MW, the second deep-tuning load threshold is 140MW, the first coefficient is 1, and the second coefficient is 0.75, that is, when the second current load capacity is 175MW, the corresponding first coefficient is 1, and when the second current load capacity is 140MW, the corresponding first coefficient is 0.75, so that it can be determined that the slope K is: (1-0.75)/(175-.
The boiler feed-forward control process is as follows: acquiring a feedforward quantity corresponding to a main steam pressure set value and a feedforward quantity corresponding to a main steam pressure difference value; and summing the target feedforward quantity corresponding to the load variation, the feedforward quantity corresponding to the main steam pressure set value and the feedforward quantity corresponding to the main steam pressure difference value to obtain the comprehensive feedforward quantity. And controlling the boiler combustion by the comprehensive feed-forward quantity. The above-mentioned integrated feedforward amount includes: a fuel quantity feed forward amount and/or a water quantity feed forward amount.
In the embodiment of the application, aiming at the dangerous working condition interval of deep load reduction of 175MW-140MW, the feedforward control part of the fuel main control and the water supply main control is optimized, and the stable operation of the unit is ensured by developing the 'brake' logic based on the thought of amplitude limiting or speed limiting.
Taking the water supply main control as an example, according to the operation data statistics and experiments during the previous load reduction period, on the basis of the feedforward amount of the normal load change, namely the load change amount, a 'brake' coefficient corresponding to the actual load command, namely the feedforward coefficient f (x) (the same as Y in the relational expression) is set, as shown in fig. 2, T represents a judgment and selection process, if the current load amount is greater than 175MW in the load reduction process, a value corresponding to the set feedforward coefficient A, namely 1, is output, and if the current load amount is less than 175MW, a feedforward coefficient f (x), namely a feedforward coefficient calculated by the function according to the current load amount is output. Then, the feedforward coefficient is multiplied by the feedforward amount corresponding to the load change amount, as shown in the figure, X, which is X, represents a multiplication operation, and the target feedforward amount corresponding to the load change amount is output. In fig. 2, a LEAD LAG LEAD-LAG module is further arranged below T, and has a filtering function, so that part of disturbance can be effectively removed. The embodiment of the application can gradually reduce the variable amplitude of feed-forward in the deep-regulation load-reducing interval, so that the feed-forward is in a safe range. The logic does not work during the load-up period by using the signal of the unit load-up and load-down as the judgment switching condition.
Taking fuel quantity feedforward control as an example to explain a boiler feedforward control process, as shown in fig. 3, after calculating a target feedforward quantity corresponding to a load variation through the above logic, further obtaining a feedforward quantity corresponding to a main steam pressure set value and a feedforward quantity corresponding to a main steam pressure difference value; and summing the target feedforward quantity corresponding to the load variation, the feedforward quantity corresponding to the main steam pressure set value and the feedforward quantity corresponding to the main steam pressure difference value to obtain the fuel quantity feedforward quantity. The calculation process of the water amount feed-forward amount is the same as the above, and is not described herein again.
According to the boiler combustion feedforward control method provided by the embodiment of the application, when the load instruction of the unit is reduced from 175MW, the 'brake' logic starts to act, the coefficient is gradually reduced from 1 and can be reduced to 0.75 at least, so that on the basis of the original feedforward calculation amount, after the 'brake' coefficient is multiplied, the feedforward amount can be reduced by 25% at most, the lower the load is, the more obvious the effect is, on the basis of the normal action of the coordinated feedforward logic, the great reduction of the fuel amount and the water supply amount is avoided, and the aim of safe operation during the deep adjustment of the unit is fulfilled. And simultaneously, in the load increasing stage and the load reducing stage without deep adjustment, the logic stops acting, and the normal load response capability of the unit is ensured.
Based on the above method embodiment, the present application further provides a boiler combustion feedforward control device, as shown in fig. 4, the device includes: the judging module 42 is configured to judge whether the first current load amount is smaller than a first deep regulation load threshold in the load reduction process of the boiler; the control module 44 is configured to, when the determination result of the determining module is yes, obtain, by the load amount obtaining module 442, a second current load amount corresponding to the current detection period for each detection period; determining a feedforward coefficient corresponding to the second current load amount through a coefficient determining module 444; the feedforward coefficient is a value smaller than 1, and is positively correlated with the current load quantity; determining a target feedforward quantity corresponding to the load variation according to a feedforward coefficient corresponding to the second current load and a feedforward quantity corresponding to the pre-calculated load variation through the calculation module 446; by the control submodule 448, a synthetic feedforward amount is determined based on the target feedforward amount corresponding to the load variation amount, and the boiler combustion is controlled by the synthetic feedforward amount.
The coefficient determining module 444 is further configured to calculate a feedforward coefficient corresponding to the second current load amount according to the second current load amount, the relation among the load amount and the feedforward coefficient.
The above relation is determined as follows: when the second current load amount is set as the first deep-adjusting load threshold value, the feedforward coefficient is a first coefficient; setting the feedforward coefficient as a second coefficient when the second front load amount is the second deep-tuning load threshold; wherein the second deep tuning load threshold is smaller than the first deep tuning load threshold; the first coefficient is a value less than or equal to one, and the second coefficient is less than the first coefficient; and determining the slope and intercept of the linear function according to the first deep adjustment load threshold, the second deep adjustment load threshold, the first coefficient and the second coefficient to obtain a relational expression between the load quantity and the feedforward coefficient.
The coefficient determining module 444 is further configured to substitute the second current load amount into a relation between the load amount and the feedforward coefficient to obtain a feedforward coefficient corresponding to the second current load amount, where the relation is as follows:
Y=KX+B；
wherein Y represents a feedforward coefficient, X represents a current load amount, K is a slope, and B is an intercept.
The coefficient determining module 444 is further configured to search the feedforward coefficient corresponding to the second current load amount according to the corresponding relationship between the preset load amount interval and the feedforward coefficient.
The calculating module 446 is further configured to multiply the feedforward amount corresponding to the load variation by the feedforward coefficient to obtain a target feedforward amount corresponding to the load variation.
The calculating module 446 is further configured to obtain a feedforward amount corresponding to the set value of the main steam pressure and a feedforward amount corresponding to the difference value of the main steam pressure; summing the target feedforward quantity corresponding to the load variation, the feedforward quantity corresponding to the main steam pressure set value and the feedforward quantity corresponding to the main steam pressure difference value to obtain a comprehensive feedforward quantity;
the above-mentioned integrated feedforward amount includes: a fuel quantity feed forward amount and/or a water quantity feed forward amount.
The device provided by the embodiment of the present application has the same implementation principle and technical effect as those of the foregoing method embodiments, and for the sake of brief description, no mention is made in the embodiment of the device, and reference may be made to the corresponding contents in the foregoing method embodiments.
Based on the above method and apparatus embodiments, the present application embodiment further provides a boiler combustion control system, which includes: a boiler main control system and a steam engine main control system; the boiler master control system is adapted to perform the method according to the first aspect.
The system provided by the embodiment of the present application has the same implementation principle and the same technical effect as the foregoing method embodiment, and for the sake of brief description, no mention is made in the embodiment of the system, and reference may be made to the corresponding contents in the foregoing method embodiment.
An electronic device is further provided in the embodiments of the present application, as shown in fig. 5, which is a schematic structural diagram of the electronic device, where the electronic device includes a processor 51 and a memory 50, the memory 50 stores computer-executable instructions capable of being executed by the processor 51, and the processor 51 executes the computer-executable instructions to implement the method.
In the embodiment shown in fig. 5, the electronic device further comprises a bus 52 and a communication interface 53, wherein the processor 51, the communication interface 53 and the memory 50 are connected by the bus 52.
The Memory 50 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 53 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used. The bus 52 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 52 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 5, but this does not indicate only one bus or one type of bus.
The processor 51 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 51. The Processor 51 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and the processor 51 reads information in the memory and performs the steps of the method of the previous embodiment in combination with hardware thereof.
Embodiments of the present application further provide a computer-readable storage medium, where computer-executable instructions are stored, and when the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to implement the method, and specific implementation may refer to the foregoing method embodiments, and is not described herein again.
The method, the apparatus, and the computer program product of the electronic device provided in the embodiments of the present application include a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. A boiler combustion feedforward control method, characterized in that the method comprises:
judging whether the first current load is smaller than a first deep load regulation threshold value or not in the load reduction process of the boiler;
if yes, aiming at each detection period, the following steps are executed:
acquiring a second current load amount corresponding to the current detection period;
determining a feedforward coefficient corresponding to the second current load amount; the feedforward coefficient is a value which is positively correlated with the second current load quantity and is less than 1; the feedforward coefficient and the second current load quantity are in a linear function relation;
determining a target feedforward quantity corresponding to the load variation according to a feedforward coefficient corresponding to a second current load quantity and a feedforward quantity corresponding to a pre-calculated load variation;
and determining a comprehensive feedforward quantity based on the target feedforward quantity corresponding to the load variation, and controlling the boiler combustion by using the comprehensive feedforward quantity.
2. The method of claim 1, wherein the step of determining the feedforward coefficient corresponding to the second current load amount comprises:
and calculating the feedforward coefficient corresponding to the second current load according to the second current load, the relation among the load and the feedforward coefficient.
3. The method of claim 2, wherein the relation is determined as follows:
when the second current load amount is set as the first deep-tuning load threshold, the feedforward coefficient is a first coefficient; when the second current load amount is set as a second deep adjustment load threshold value, the feedforward coefficient is a second coefficient; wherein the second deep tuning load threshold is less than the first deep tuning load threshold; the first coefficient is a value less than or equal to one, and the second coefficient is less than the first coefficient;
and determining the slope and intercept of a linear function according to the first deep adjustment load threshold, the second deep adjustment load threshold, the first coefficient and the second coefficient to obtain a relational expression between the load capacity and the feedforward coefficient.
4. The method according to claim 3, wherein the step of calculating the feedforward coefficient corresponding to the second current load amount according to the relationship among the second current load amount, the load amount and the feedforward coefficient comprises:
substituting the second current load amount into a relational expression between the load amount and the feedforward coefficient to obtain the feedforward coefficient corresponding to the second current load amount, wherein the relational expression is as follows:
Y=KX+B；
wherein Y represents the feedforward coefficient, X represents the second current load amount, K is a slope, and B is an intercept.
5. The method of claim 1, wherein the step of determining the feedforward coefficient corresponding to the second current load amount comprises:
and searching the feedforward coefficient corresponding to the second current load according to the corresponding relation between the preset load interval and the feedforward coefficient.
6. The method according to claim 1, wherein the step of determining the target feedforward amount corresponding to the load change amount according to the feedforward coefficient corresponding to the second current load amount and the feedforward amount corresponding to the pre-calculated load change amount comprises:
and multiplying the feedforward quantity corresponding to the load variation by the feedforward coefficient to obtain the target feedforward quantity corresponding to the load variation.
7. The method according to claim 1, wherein the step of determining the integrated feedforward amount based on the target feedforward amount corresponding to the load variation amount includes:
acquiring a feedforward quantity corresponding to a main steam pressure set value and a feedforward quantity corresponding to a main steam pressure difference value;
and summing the target feedforward quantity corresponding to the load variation, the feedforward quantity corresponding to the main steam pressure set value and the feedforward quantity corresponding to the main steam pressure difference value to obtain the comprehensive feedforward quantity.
8. The method of claim 1, wherein the integrated feedforward quantity comprises: a fuel quantity feed forward amount and/or a water quantity feed forward amount.
9. A boiler combustion feedforward control arrangement, the arrangement comprising:
the judging module is used for judging whether the first current load is smaller than a first deep load regulation threshold value or not in the load reduction process of the boiler;
the control module is used for executing the following steps aiming at each detection period when the judgment result of the judgment module is yes: acquiring a second current load amount corresponding to the current detection period; determining a feedforward coefficient corresponding to the second current load amount; the feedforward coefficient is a value which is positively correlated with the second current load amount and is less than 1; the feedforward coefficient and the second current load quantity are in a linear function relation; determining a target feedforward quantity corresponding to the load variation according to a feedforward coefficient corresponding to a second current load quantity and a feedforward quantity corresponding to a pre-calculated load variation; and determining a comprehensive feedforward quantity based on the target feedforward quantity corresponding to the load variation, and controlling the boiler combustion by using the comprehensive feedforward quantity.
10. A boiler combustion control system, characterized in that the system comprises: a boiler main control system and a steam engine main control system; the boiler master control system is adapted to perform the method according to any of claims 1-8.
11. An electronic device comprising a processor and a memory, the memory storing computer-executable instructions executable by the processor, the processor executing the computer-executable instructions to implement the method of any of claims 1 to 8.
12. A computer-readable storage medium having computer-executable instructions stored thereon which, when invoked and executed by a processor, cause the processor to implement the method of any of claims 1 to 8.
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| CN112648029B (en) * | 2020-12-14 | 2022-08-05 | 华能国际电力股份有限公司上安电厂 | Coordinated control optimization method for deep peak regulation working condition of thermal power plant |
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