Regulation and control method and system for boiler combustion optimization logic configuration

Abstract

The invention provides a regulation and control method and system for boiler combustion optimization logic configuration, and relates to the technical field of electric power grids. By setting the load air volume curve, the load radiation energy curve and the radiation energy fuel quantity curve, the target air volume, the target radiation quantity and the target fuel quantity under the current load are calculated respectively, decoupling of the air volume and the fuel quantity in boiler unit control is achieved, and the air supply volume and the fuel quantity of the boiler unit change along with the load at the same time; the influence of fuel quantity disturbance on the boiler unit is eliminated, the problems of lag and overshoot existing in a coal-fired power plant boiler coal feed quantity control system are solved, and the accuracy of boiler unit control is improved. Therefore, the heat release level of the boiler unit can be rapidly and accurately controlled, and the operation stability and economical efficiency of the boiler unit are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power grid, and in particular to a control method and system for optimizing the logic configuration of boiler combustion. Background Art

[0002] Among the three main engines of a thermal power unit, namely, the boiler, steam turbine and generator, it is a fast process for the fuel to enter the boiler furnace to burn and release energy. It is a slow process to transfer energy to the steam in the boiler heat exchanger through heat conduction, convection and other heat transfer methods. It is also a fast process for the steam to enter the steam turbine and drive the generator to generate electricity. The existing unit direct energy balance control strategy only considers the balance between the energy carried by the steam at the boiler outlet and the turbine inlet and the unit's power generation load demand. It does not fully consider the time delay between the heat release in the combustion process and the transfer of it to the steam-water system, which makes it difficult to further improve the unit's optimization control performance. It can be seen that the energy-saving potential of boilers in thermal power units is huge, and the key to boiler energy saving lies in the improvement of online monitoring methods for heat release in the furnace and the corresponding new combustion optimization control strategy.

[0003] For the online monitoring and optimization control of heat release in the pulverized coal furnace of thermal power units, the literature [Zhou Huaichun. Principles and Technology of Visualized Detection of Flames in Furnaces. Beijing: Science Press, 2005] proposed a combustion optimization control technology based on furnace visualization. Its essence is to use sensors to obtain the spontaneous radiation signal emitted by combustion, and obtain the radiation energy signal representing the heat release in the furnace through image processing, spectral analysis and other methods, and then propose a combustion optimization control strategy with the radiation energy signal as the intermediate controlled quantity. Based on this concept, the literature [Zhang Shishuai, Zhou Huaichun, Jia Tao, et al. Main steam pressure characteristics and simulation research based on furnace radiation energy signal. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2002 (02): 54-56] obtained the radiation energy signal of a 300MW coal-fired unit, and carried out open-loop tests of boiler fuel disturbance and steam turbine throttle opening disturbance, and introduced the furnace radiation energy signal into the feedback control of the fuel quantity to improve the stability of the main steam pressure under variable load conditions. Reference [Luo Zixue, Liang Peilu, Zhou Huaichun, et al. Research on optimal control of boiler oxygen content by introducing radiation energy signal. Proceedings of the CSEE, 2006(23):100-103] The radiation energy signal is introduced into the optimal control strategy of oxygen content to improve the control quality of main steam temperature.

[0004] However, the current boiler optimization technology is still based on the concept of air-coal ratio, with feedforward coarse adjustment based on the fuel quantity, and feedback fine adjustment based on the deviation of exhaust oxygen content. The adjustment of fuel will affect the control of air volume. In this process, the disturbance of fuel quantity can easily affect the operation of boiler units, causing lag and overshoot problems in coal-fired power plants, and making it difficult to control the power generation of boiler units. Summary of the invention

[0005] The present invention provides a control method and system for boiler combustion optimization logic configuration, which can eliminate the influence of fuel quantity disturbance on boiler unit, overcome the lag and overshoot problems existing in the coal feed quantity control system of coal-fired power station boiler, and improve the accuracy of boiler unit control.

[0006] In the first aspect, the present invention provides a control method for the logical configuration of boiler combustion optimization, the method comprising: obtaining the target load and current load instruction of the boiler unit; determining the target air volume based on the target load and the current load instruction, and the load air volume curve; the load air volume curve is used to characterize the air supply volume when the boiler unit is most efficient under different loads; determining the target radiation energy based on the target load and the current load instruction, and the load radiation energy curve; the load radiation energy curve is used to characterize the radiation energy when the boiler unit is most efficient under different loads; determining the target fuel quantity based on the target radiation energy and the radiation energy fuel quantity curve; the radiation energy fuel quantity curve is used to characterize the corresponding relationship between the fuel quantity and the radiation energy of the boiler unit under different operating conditions; and controlling the logical configuration of the boiler generator set based on the target air volume and the target fuel quantity.

[0007] In one possible implementation, the target air volume is determined based on the target load, the current load instruction, and the load air volume curve, including: determining the load increase and decrease value and the load steady-state value based on the target load and the current load instruction; determining the dynamic air volume adjustment amount based on the load increase and decrease value and the load air volume curve corresponding to the load increase and decrease value; the load air volume curve includes a load air volume increase curve, a load air volume decrease curve and a load air volume steady-state curve; determining the steady-state air volume adjustment amount based on the load steady-state value and the load air volume steady-state curve; determining the target air volume based on the dynamic air volume adjustment amount, the steady-state air volume adjustment amount and the initial air volume given instruction.

[0008] In one possible implementation, the target radiation energy is determined based on the target load, the current load instruction, and the load radiation energy curve, including: determining the load increase and decrease value and the load steady-state value based on the target load and the current load instruction; determining the dynamic adjustment amount of radiation energy based on the load increase and decrease value and the load radiation energy curve corresponding to the load increase and decrease value; the load radiation energy curve includes a load radiation energy increase curve, a load radiation energy decrease curve and a load radiation energy steady-state curve; determining the steady-state adjustment amount of radiation energy based on the load steady-state value and the load radiation energy steady-state curve; determining the target radiation energy based on the dynamic adjustment amount of radiation energy, the steady-state adjustment amount of radiation energy and the initial radiation energy signal.

[0009] In one possible implementation, a target fuel amount is determined based on the target radiation energy and a radiation energy fuel amount curve, including: determining a fuel adjustment amount based on the target radiation energy and the radiation energy fuel amount curve; determining the target fuel amount based on the fuel adjustment amount and a fuel master control amount.

[0010] In a possible implementation, based on the target load and the current load instruction, as well as the load air volume curve, before determining the target air volume, it also includes: keeping the coal feed and the main steam flow of the boiler unit unchanged, increasing the air supply of the boiler unit by a set amplitude, and detecting the efficiency of the boiler unit; when the efficiency of the boiler unit is the highest, recording the actual power generated by the boiler unit; determining the load air volume increase curve based on the air supply volume and the actual power generated by the boiler unit under different loads; keeping the coal feed and the main steam flow of the boiler unit unchanged, reducing the air supply of the boiler unit by a set amplitude, and detecting the efficiency of the boiler unit; when the efficiency of the boiler unit is the highest, recording the actual power generated by the boiler unit; determining the load air volume reduction curve based on the air supply volume and the actual power generated by the boiler unit under different loads.

[0011] In a possible implementation, before determining the target radiation energy based on the target load and the current load instruction, as well as the load radiation energy curve, it also includes: detecting the full-band spectral data of each point in the boiler furnace when the boiler unit is most efficient under different loads; for any load, based on the full-band spectral data of each point in the boiler furnace under the load, integrating the wavelength, hemispherical solid angle space and radiation surface area respectively to obtain the full-band radiation energy value under the load; based on the load values ​​and full-band radiation energy values ​​under different loads, performing data fitting to obtain the load radiation energy curve.

[0012] In a possible implementation, before determining the target fuel amount based on the target radiation energy and the radiation energy fuel amount curve, it also includes: detecting the full-band spectral data of each point in the boiler furnace when the boiler unit is most efficient at different fuel amounts; for any fuel amount, based on the full-band spectral data of each point in the boiler furnace at this fuel amount, integrating the wavelength, hemispherical solid angle space and radiation surface area respectively to obtain the full-band radiation energy value at this fuel amount; based on the fuel amount and the full-band radiation energy value at different fuel amounts, performing data fitting to obtain the radiation energy fuel amount curve.

[0013] In the second aspect, an embodiment of the present invention provides a control system for a boiler combustion optimization logic configuration, the control system comprising: a communication module for obtaining a target load and a current load instruction of a boiler unit; a processing module for determining a target air volume based on the target load and the current load instruction, as well as a load air volume curve; the load air volume curve is used to characterize the air supply volume when the boiler unit is most efficient under different loads; based on the target load and the current load instruction, as well as a load radiation energy curve, a target radiation energy is determined; the load radiation energy curve is used to characterize the radiation energy when the boiler unit is most efficient under different loads; based on the target radiation energy and a radiation energy fuel quantity curve, a target fuel quantity is determined; the radiation energy fuel quantity curve is used to characterize the correspondence between the fuel quantity and the radiation energy of the boiler unit under different operating conditions; based on the target air volume and the target fuel quantity, the logical configuration of the boiler generator set is controlled.

[0014] In one possible implementation, the processing module is specifically used to determine the load increase / decrease value and the load steady-state value based on the target load and the current load instruction; determine the dynamic air volume adjustment amount based on the load increase / decrease value and the load air volume curve corresponding to the load increase / decrease value; the load air volume curve includes a load air volume increase curve, a load air volume decrease curve and a load air volume steady-state curve; determine the steady-state air volume adjustment amount based on the load steady-state value and the load air volume steady-state curve; determine the target air volume based on the dynamic air volume adjustment amount, the steady-state air volume adjustment amount and the initial air volume given instruction.

[0015] In one possible implementation, the processing module is specifically used to determine the load increase / decrease value and the load steady-state value based on the target load and the current load instruction; determine the dynamic adjustment amount of radiation energy based on the load increase / decrease value and the load radiation energy curve corresponding to the load increase / decrease value; the load radiation energy curve includes a load radiation energy increase curve, a load radiation energy decrease curve and a load radiation energy steady-state curve; determine the steady-state adjustment amount of radiation energy based on the load steady-state value and the load radiation energy steady-state curve; determine the target radiation energy based on the dynamic adjustment amount of radiation energy, the steady-state adjustment amount of radiation energy and the initial radiation energy signal.

[0016] In a third aspect, an embodiment of the present invention provides an electronic device, comprising a memory and a processor, the memory storing a computer program, the processor being used to call and run the computer program stored in the memory to perform the steps of the method described in the first aspect and any possible implementation method of the first aspect.

[0017] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and wherein when the computer program is executed by a processor, the steps of the method described in the first aspect and any possible implementation method of the first aspect are implemented.

[0018] The present invention provides a control method and system for boiler combustion optimization logic configuration. The present invention calculates the target air volume, target radiation amount and target fuel amount under the current load by setting a load air volume curve, a load radiation energy curve and a radiation energy fuel amount curve, respectively, and realizes the decoupling of air volume and fuel amount in boiler unit control, so that the air supply volume and fuel amount of the boiler unit change with the load at the same time, eliminates the influence of fuel amount disturbance on the boiler unit, overcomes the lag and overshoot problems existing in the coal supply control system of the coal-fired power station boiler, and improves the accuracy of boiler unit control. Therefore, the present invention can quickly and accurately control the heat release level of the boiler unit, and effectively improve the operating stability and economy of the boiler unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a flow chart of a control method of a boiler combustion optimization logic configuration provided by an embodiment of the present invention;

[0021] Figure 2 is a calculation flow chart of a target air volume provided by an embodiment of the present invention;

[0022] Figure 3 is a calculation flow chart of a target fuel quantity provided by an embodiment of the present invention;

[0023] Figure 4 is a structural schematic diagram of a radiation energy collection system provided by an embodiment of the present invention;

[0024] Figure 5 It is a structural schematic diagram of a boiler combustion optimization logic configuration control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0026] In the description of the present invention, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" and "plurality" refer to two or more. The words "first", "second", etc. do not limit the quantity and execution order, and the words "first", "second", etc. do not limit them to be different.

[0027] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0028] In addition, the terms "including" and "having" and any variations thereof mentioned in the description of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or modules is not limited to the listed steps or modules, but may optionally include other steps or modules that are not listed, or may optionally include other steps or modules that are inherent to these processes, methods, products or devices.

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be described through specific embodiments in conjunction with the accompanying drawings of the present invention.

[0030] As described in the background technology, currently the boiler unit is easily affected by the disturbance of fuel quantity during the control process, resulting in lag and overshoot problems in coal-fired power plants, and the power generation control of the boiler unit is relatively difficult.

[0031] In order to solve the above technical problems, the embodiment of the present invention provides a control method and system for the logical configuration of boiler combustion optimization. The essence of coal-fired power generation unit control is load control, that is, to control the various energy conversion links from the release of fuel chemical energy to the power generation of steam turbine generator according to the load instruction, that is, the most important driving force for the boiler operation adjustment is the change in the external demand for boiler output (steam flow). However, in actual applications, when the boiler burns different types of coal, considering the same load, if it is assumed that the boiler combustion efficiency, boiler thermal efficiency, etc. remain unchanged, the boiler produces an equal amount of steam with the same parameters, corresponding to the basically same combustion heat release in the furnace, and the theoretical amount of air required for boiler combustion is basically the same, and the error is mainly caused by the inability of the fuel to be completely burned in the furnace. Therefore, the boiler air supply volume under the same load remains basically unchanged. It can be considered that the control of the boiler air supply volume only needs to be adjusted according to the load change, and the fluctuation of fuel quality has little effect on the total air volume. Based on this concept, the present invention provides a solution for adjusting the total air volume of the boiler with the load in the distributed control system (DCS) of the unit, which no longer requires frequent control with changes in fuel quality, thereby achieving basic decoupling between wind and coal and improving the peak-shaving capacity of coal-fired boilers in thermal power plants.

[0032] like Figure 1 As shown, an embodiment of the present invention provides a method for controlling a boiler combustion optimization logic configuration. The method includes steps S101-S106.

[0033] S101. Obtain the target load and current load instruction of the boiler unit.

[0034] S102: Determine the target air volume based on the target load, the current load instruction, and the load air volume curve.

[0035] In the embodiment of the present application, the load air volume curve is used to characterize the air volume supplied by the boiler unit when the efficiency is highest under different loads.

[0036] Figure 2 A flow chart for calculating a target air volume provided in an embodiment of the present invention.

[0037] based on Figure 2 As a possible implementation, step S102 can be specifically implemented as steps S1021-S1024.

[0038] S1021. Determine a load increase / decrease value and a load steady-state value based on the target load and the current load instruction.

[0039] S1022. Determine the dynamic adjustment amount of the air volume based on the load increase / decrease value and the load air volume curve corresponding to the load increase / decrease value.

[0040] In some embodiments, the load air volume curve includes a load air volume load-up curve, a load air volume load-down curve, and a load air volume steady-state curve.

[0041] S1023. Determine the steady-state adjustment amount of the air volume based on the steady-state value of the load and the steady-state curve of the load air volume.

[0042] S1024. Determine the target air volume based on the dynamic air volume adjustment amount, the steady-state air volume adjustment amount, and the initial air volume given instruction.

[0043] S103: Determine the target radiant energy based on the target load, the current load instruction, and the load radiant energy curve.

[0044] In the embodiment of the present application, the load radiation energy curve is used to characterize the radiation energy of the boiler unit when the efficiency is highest under different loads.

[0045] Figure 3 A flow chart for calculating a target fuel quantity provided by an embodiment of the present invention.

[0046] based on Figure 3 As a possible implementation, step S103 can be specifically implemented as steps S1031-S1034.

[0047] S1031. Determine a load increase / decrease value and a load steady-state value based on the target load and the current load instruction.

[0048] S1032. Determine a dynamic adjustment amount of radiation energy based on the load increase / decrease value and a load radiation energy curve corresponding to the load increase / decrease value.

[0049] In some embodiments, the load radiation energy curve includes a load radiation energy load-up curve, a load radiation energy load-down curve, and a load radiation energy steady-state curve.

[0050] S1033. Determine a steady-state adjustment amount of radiation energy based on the steady-state value of the load and the steady-state curve of the radiation energy of the load.

[0051] S1034. Determine the target radiation energy based on the dynamic adjustment amount of the radiation energy, the steady-state adjustment amount of the radiation energy, and the initial radiation energy signal.

[0052] S104 , determining a target fuel quantity based on the target radiation energy and the radiation energy fuel quantity curve.

[0053] In the embodiment of the present application, the radiation energy fuel quantity curve is used to characterize the corresponding relationship between the fuel quantity and the radiation energy of the boiler unit under different operating conditions.

[0054] As a possible implementation manner, step S104 may be specifically implemented as steps S1041 - S1042 .

[0055] S1041. Determine a fuel adjustment amount based on the target radiation energy and the radiation energy fuel amount curve.

[0056] S1042: Determine the target fuel amount based on the fuel adjustment amount and the fuel master control amount.

[0057] S105. Based on the target air volume and the target fuel volume, the logical configuration of the boiler generator set is regulated.

[0058] The present invention provides a control method for boiler combustion optimization logic configuration, by setting a load air volume curve, a load radiation energy curve and a radiation energy fuel amount curve, respectively calculating the target air volume, target radiation amount and target fuel amount under the current load, realizing the decoupling of air volume and fuel amount in boiler unit control, making the air volume and fuel amount of the boiler unit change with the load at the same time, eliminating the influence of fuel amount disturbance on the boiler unit, overcoming the lag and overshoot problems existing in the coal supply control system of the coal-fired power station boiler, and improving the accuracy of boiler unit control. Therefore, the present invention can quickly and accurately control the heat release level of the boiler unit, and effectively improve the operation stability and economy of the boiler unit.

[0059] Exemplarily, an embodiment of the present invention can make a rise or fall judgment on the current load condition based on the unit load command and the unit target load, and derive a new air supply volume main control command based on the current condition and the load command; the difference between the new air supply volume control command under the rise or fall load and the steady-state load is that the new air supply volume control command under the rise or fall load strengthens the control action of the air supply volume under the variable load through a proportional coefficient greater than 1; the new air supply volume control command signal is subtracted from the original command, and the difference is then limited and superimposed on the original air supply volume command at a certain ratio, so that the fusion of the two signals can be realized safely and reliably, achieving a comprehensive control effect.

[0060] Exemplarily, the embodiment of the present invention can use the unit load demand (ULD), i.e., the unit load demand signal, as the boiler steady-state power demand signal. On the basis of the unit load command ULD, the main steam pressure deviation correction (i.e., the deviation between the main steam pressure setting value Ps and the measured value Pt is PID-operated) is added to form the final boiler master control output command signal (Boiler Master Out, BMOUT). After the boiler master control output and the total fuel amount are PID-operated, it is used as the fuel master control output to control the capacity air volume of multiple coal mills and the coal feeder coal amount.

[0061] Optionally, the control method for boiler combustion optimization logic configuration provided by the embodiment of the present invention further includes steps S201-S206 before step S102.

[0062] S201. Keep the coal feed rate and main steam flow rate of the boiler unit unchanged, increase the air supply of the boiler unit by a set amount, and test the efficiency of the boiler unit.

[0063] S202. When the efficiency of the boiler unit is the highest, record the actual power generated by the boiler unit.

[0064] S203. Determine a load air volume increase curve based on the air supply volume and actual power of the boiler unit under different loads.

[0065] S204. Keep the coal supply and main steam flow of the boiler unit unchanged, reduce the air supply of the boiler unit by a set amount, and test the efficiency of the boiler unit.

[0066] S205. When the efficiency of the boiler unit is the highest, record the actual power generated by the boiler unit.

[0067] S206. Determine a load air volume reduction curve based on the air supply volume and actual power of the boiler unit under different loads.

[0068] It should be noted that the embodiments of the present invention can carry out combustion adjustment tests to obtain the corresponding functional relationship between load and air supply under different working conditions; carry out online detection tests of full-band radiation energy in the furnace to obtain the corresponding functional relationship between load and full-band radiation energy under different working conditions; establish air volume optimization configuration logic to implement regulation and control of air supply. According to the corresponding functional relationship between air supply and load obtained above, a configuration logic is established, which outputs a correction value of the main control signal of air supply, which is added to the original air supply instruction at a certain ratio after limiting, and the air supply is regulated and controlled. A fuel quantity optimization configuration logic is established to implement regulation and control of fuel quantity. The main means of implementation is to use the existing unit DCS software and hardware, retain the original control strategy, and only add a fuel optimization control signal based on the furnace radiation energy signal on the basis of the original control loop. After limiting, it is superimposed on the original control instruction signal, and after correction, it participates in the automatic control of the unit.

[0069] Exemplarily, the embodiment of the present invention can draw the load air volume curve through steps S1-S2.

[0070] S1: Under the condition that the boiler coal feed and main steam flow remain unchanged, different air supply volumes (corresponding to different flue gas oxygen contents) are selected under different loads, the air door opening is changed by 1%-5%, and combustion adjustment tests are carried out under different types of air distribution methods.

[0071] S2: Record the air volume measurement signals under various working conditions of the combustion adjustment test (obtained by adding the measured values ​​of the air volumes of individual air ducts such as primary air, secondary air, and tertiary air), and test the efficiency of the boiler and the unit, identify the air volume value corresponding to the highest efficiency under different loads, obtain the optimal air volume curve under different loads, and establish the corresponding functional relationship between load and air volume.

[0072] For example, the embodiment of the present invention can take a 330MW coal-fired boiler of a thermal power unit as the research object. The boiler is a subcritical, intermediate single reheat, natural circulation single furnace, coal-fired drum boiler, single furnace Π-shaped layout, and adopts a four-corner tangential combustion method. Carry out a combustion adjustment test, the purpose of the test is to determine the corresponding relationship between the total air volume and the unit power under the condition that the boiler coal feed and main steam flow remain unchanged. Test conditions: the boiler master control and steam turbine master control are manual, the fuel master control is manual, and the capacity wind damper is automatic.

[0073] First, conduct tests on the opening of each layer of secondary air dampers and unit efficiency under different operating conditions to determine the optimal opening of the secondary air dampers; conduct tests on the carbon content of large slag and fly ash and boiler efficiency before and after the secondary air dampers are adjusted to determine the impact on the unit's economy. Under the condition that the boiler coal feed and main steam flow remain unchanged, change the opening of the secondary air dampers of the AB layer by 5% and the opening of the secondary air dampers of the DE layer by 5%, respectively, and observe the changes in the unit. It is found that as the secondary air dampers are opened, the unit efficiency gradually increases, reaches a peak at an opening of about 60%, and then gradually decreases. The NOX at the furnace outlet reaches a peak at an opening of 65%, and then gradually decreases. The adjustment test of the opening of the secondary air dampers of other layers is similar.

[0074] Secondly, manually increase or decrease the opening of the air volume main control by 5%, and observe the curves of the air volume main control output, the average opening of the capacity air damper, the total capacity air flow, the main steam pressure, the radiation energy, the main steam flow, and the actual power. Analyze and study the dynamic relationship between the total capacity air flow and the main steam pressure and the actual power (or main steam flow), and establish a mathematical model of the total capacity air volume and the actual power. Comprehensively analyze the data obtained from the combustion adjustment test, and fit the corresponding functional relationship between the load and the air supply volume.

[0075] In this way, the embodiment of the present invention can measure the functional relationship between the load and the air supply volume through a manual test of the boiler unit, and obtain a load-air volume curve, which is convenient for controlling the boiler unit.

[0076] Optionally, the control method for the boiler combustion optimization logic configuration provided by the embodiment of the present invention further includes steps S301-S303 before step S103.

[0077] S301. Detect the full-band spectrum data of each point in the boiler furnace when the boiler unit has the highest efficiency under different loads.

[0078] S302. For any load, based on the full-band spectrum data of each point in the boiler furnace under the load, the wavelength, hemispherical solid angle space and radiation surface area are integrated respectively to obtain the full-band radiation energy value under the load.

[0079] S303 , performing data fitting based on the load values ​​and full-band radiation energy values ​​under different loads to obtain a load radiation energy curve.

[0080] It should be noted that the embodiment of the present invention can realize the drawing of the load radiation energy curve based on steps S3-S4.

[0081] S3: Several visible light-infrared spectrometers are arranged along the height and cross-sectional direction of the boiler furnace to collect full-band spectral data of the thermal radiation area online. The flame spectrum radiation intensity obtained is integrated with respect to wavelength, hemispherical solid angle space, and radiation surface area of ​​the burning flame in turn to obtain the full-band radiation energy Q of the burning flame in the furnace.

[0082] Exemplarily, the radiation energy calculation formula is as follows.

[0083] Q = ∫∫ S ∫ Ω＝2π ∫ λ I λ dλdΩdS

[0084] Where: Q is the radiation energy, unit W, S is the radiation surface area of ​​the furnace, unit m 2 ;Ω is the solid angle, unit is sr;λ is the wavelength, unit is m;I λ is the spectral radiation intensity, unit is W / m 2 / sr.

[0085] S2: For units equipped with visible light-infrared spectrum probes, record the full-band radiation energy signal within the load operating range of 30%-100%, identify the full-band radiation energy value corresponding to the highest efficiency under different loads, and obtain the corresponding functional relationship between load and radiation energy level under different working conditions.

[0086] like Figure 4As shown, an embodiment of the present invention provides a structural schematic diagram of a radiation energy collection system. In the present invention, the radiation energy collection system uses 12 visible light-infrared spectrum probes arranged in six layers to obtain the radiation image information of the combustion flame in the furnace from different heights of the four corners of the furnace. The first layer is located at the boiler elevation of 21.28 meters, and the second layer is located at the boiler elevation of 25.88 meters, mainly monitoring the thermal radiation information of the burner area in the furnace; the third layer is located at the boiler elevation of 30.48 meters, and the fourth layer is located at the boiler elevation of 35.08 meters, mainly monitoring the thermal radiation information of the center area of ​​the furnace flame; the fifth layer is located at the boiler elevation of 40.40 meters; the sixth layer is located at the boiler elevation of 44.30 meters, mainly monitoring the flame radiation information of the furnace outlet area. Based on the acquired spectral radiation intensity of the combustion flame in the furnace, the total radiation energy signal of the combustion in the furnace is summarized through a digital processing method to reflect the changes in the furnace combustion rate in real time. Taking into account the safety of power plant operation, the system's hardware configuration adopts a dual computer system. An industrial computer A is used for data processing, including using the RS485 industrial bus to collect data from the unit's DCS system and complete the processing of the radiation spectrum in the furnace; another industrial computer B is used to perform online identification of the acquired fuel quantity and total radiation energy signals, establish a corresponding functional relationship between the two, and output it to the boiler combustion control system.

[0087] In this way, the embodiment of the present invention can measure the radiation energy under different loads by detecting the radiation energy, thereby facilitating the determination of the fuel amount under different loads and achieving the decoupling of the air volume and fuel amount of the boiler unit.

[0088] Optionally, the control method for the boiler combustion optimization logic configuration provided by the embodiment of the present invention further includes steps S401-S406 before step S104.

[0089] S401. Detect the full-band spectrum data of each point in the boiler furnace when the boiler unit has the highest efficiency under different fuel amounts.

[0090] S402. For any amount of fuel, based on the full-band spectrum data of each point in the boiler furnace under the fuel amount, the wavelength, hemispherical solid angle space and radiation surface area are integrated respectively to obtain the full-band radiation energy value under the fuel amount.

[0091] S403, performing data fitting based on the fuel amount and the full-band radiation energy value at different fuel amounts to obtain a radiation energy fuel amount curve.

[0092] It should be noted that the general principles of air volume optimization design and configuration are: retain the original design, and the new design and the original design can be selected through a switch; the logic outlet of the new design should be connected to a limiter module, and its upper and lower limits are set to 0 before debugging.

[0093] The qualified capacity air flow is averaged after ∑. Each capacity air flow passes through a first-order inertia module before ∑. The proportional coefficient K and time constant T are temporarily set to 0 and will be adjusted during debugging. In the fuel regulation loop, the capacity wind average value replaces the current capacity wind damper average value.

[0094] The tracking value of the boiler master controller is changed to the average value of the capacity wind, and the PID of the fuel regulator adopts a variable proportional band design. In the regulation loop of the primary fan outlet pressure, a logic of dynamic response to the change of load command is added. For the boiler coordination regulator and the steam turbine coordination regulator, the control mode of three regulators coexisting at present is cancelled. By searching the historical data, the corresponding data of the capacity wind average value and the load under different loads are found, and filled into the pressure regulation feedforward function f(x) of the coordinated control.

[0095] The embodiment of the present invention improves the accuracy of regulating the power of the unit by the amount of coal by introducing the radiation energy signal and adjusting the relevant parameters, so as to achieve the stability of the main parameters of the boiler while improving the load response of the steam turbine. The fuel control system is adjusted and tested, and the optimal adjustment parameters of the fuel regulator are preliminarily determined based on the corresponding functional relationship between the fuel amount and the total radiation energy signal. The fuel regulation system is put into closed-loop operation, and the following tests are carried out:

[0096] Carry out a given value disturbance test on the fuel regulation loop, manually change the output of the boiler master controller, observe the dynamic response of the fuel quantity (capacity wind), and continuously optimize the parameters of the fuel regulator; test the adaptability of the fuel regulation loop, and observe the regulation effect of the fuel regulation loop in response to a given value disturbance by changing the number of capacity wind dampers put into automatic operation; preliminarily determine the optimization parameters of the pressure regulator based on the aforementioned disturbance test, and put the pressure regulation system into closed-loop control; carry out a set value disturbance test on the pressure regulation loop, manually change the pressure set value, observe the regulation effect of the pressure regulation loop, and continuously optimize the various control parameters of the pressure regulator; in the pressure regulation system, put the correction function of the radiation energy signal into operation, and through the pressure set value disturbance test, continuously optimize and adjust the intensity and duration of the radiation energy signal, observe and compare the before and after regulation effects of the pressure regulator; put the steam turbine master controller into automatic operation to put the coordinated control into operation. According to the results of the dynamic characteristics test, the adjustment parameters of the boiler master controller and the steam turbine master controller are preliminarily determined, and the PID adjustment parameters are continuously optimized and adjusted through variable load tests; the primary fan outlet pressure control loop is optimized, and the relevant parameters of its dynamic links are adjusted to fully utilize the heat storage capacity (powder storage capacity) of the double-inlet and double-outlet coal mill to improve the dynamic response of boiler combustion; the total radiation energy / power function F(x) is adjusted according to actual conditions, and the relevant leading and lagging links of the coordination system are adjusted to match the dynamic relationship between the turbine and the boiler, thereby improving the coordinated control system's regulation performance for load and pressure.

[0097] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0098] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0099] Figure 5 The schematic diagram of the structure of a control system of a boiler combustion optimization logic configuration provided by an embodiment of the present invention is shown. The control system 500 includes a communication module 501 and a processing module 502 .

[0100] The communication module 501 is used to obtain the target load and current load instruction of the boiler unit.

[0101] Processing module 502 is used to determine the frequency deviation and frequency change rate of each monitoring point based on the power grid operation data of each monitoring point; determine the active power adjustment amount based on the frequency deviation and frequency change rate of each monitoring point; group the distributed new energy based on the real-time operation data of the distributed new energy cluster, and determine each functional group, which includes a rapid response group, a continuous support group and a standby group; determine the collaborative control scheme of each functional group based on the active power adjustment amount and each functional group; based on the collaborative control scheme, perform active power regulation on the distributed new energy cluster to achieve frequency inertia support.

[0102] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A control method for boiler combustion optimization logic configuration, characterized in that: include: Obtain the target load and current load instructions of the boiler unit; Determine the target air volume based on the target load and the current load instruction, and the load air volume curve; The load air volume curve is used to characterize the air volume of the boiler unit when it is most efficient under different loads; Determining target radiant energy based on the target load and the current load instruction, and the load radiant energy curve; The load radiation energy curve is used to characterize the radiation energy of the boiler unit when it is most efficient under different loads; Based on the target radiation energy and the radiation energy fuel quantity curve, the target fuel quantity is determined; the radiation energy fuel quantity curve is used to characterize the corresponding relationship between the fuel quantity and the radiation energy of the boiler unit under different working conditions; Based on the target air volume and the target fuel volume, the logical configuration of the boiler generator set is regulated.

2. The control method of boiler combustion optimization logic configuration according to claim 1 is characterized in that: The determining the target air volume based on the target load, the current load instruction, and the load air volume curve includes: Determining a load increase / decrease value and a load steady-state value based on the target load and the current load instruction; Based on the load increase and decrease values ​​and the load air volume curve corresponding to the load increase and decrease values, determine the dynamic air volume adjustment amount; the load air volume curve includes a load air volume increase curve, a load air volume decrease curve and a load air volume steady-state curve; Determining a steady-state air volume adjustment amount based on the load steady-state value and the load air volume steady-state curve; The target air volume is determined based on the dynamic air volume adjustment amount, the steady-state air volume adjustment amount and the initial air volume given instruction.

3. The control method of boiler combustion optimization logic configuration according to claim 1 is characterized in that: The determining the target radiant energy based on the target load, the current load instruction, and the load radiant energy curve comprises: Determining a load increase / decrease value and a load steady-state value based on the target load and the current load instruction; Based on the load increase and decrease values ​​and the load radiation energy curve corresponding to the load increase and decrease values, determining the radiation energy dynamic adjustment amount; the load radiation energy curve includes a load radiation energy increase curve, a load radiation energy decrease curve and a load radiation energy steady-state curve; Determining a steady-state adjustment amount of radiation energy based on the steady-state value of the load and a steady-state curve of radiation energy of the load; The target radiation energy is determined based on the radiation energy dynamic adjustment amount, the radiation energy steady-state adjustment amount and the initial radiation energy signal.

4. The control method of boiler combustion optimization logic configuration according to claim 1 is characterized in that: The step of determining the target fuel quantity based on the target radiation energy and the radiation energy fuel quantity curve comprises: determining a fuel adjustment amount based on the target radiant energy and a radiant energy-fuel amount curve; Based on the fuel adjustment amount and the fuel master control amount, a target fuel amount is determined.

5. The control method of boiler combustion optimization logic configuration according to claim 1 is characterized in that: Before determining the target air volume based on the target load, the current load instruction, and the load air volume curve, the method further includes: Keeping the coal feed rate and main steam flow rate of the boiler unit unchanged, increasing the air supply volume of the boiler unit by a set amplitude, and testing the efficiency of the boiler unit; When the efficiency of the boiler unit is the highest, the actual power generated by the boiler unit is recorded; Based on the air supply volume and actual power of the boiler unit under different loads, determine the load air volume increase curve; Keeping the coal feed rate and main steam flow rate of the boiler unit unchanged, reducing the air supply volume of the boiler unit by a set range, and testing the efficiency of the boiler unit; When the efficiency of the boiler unit is the highest, the actual power generated by the boiler unit is recorded; Based on the air supply volume and actual power of the boiler unit under different loads, the load air volume reduction curve is determined.

6. The control method of boiler combustion optimization logic configuration according to claim 1 is characterized in that: Before determining the target radiant energy based on the target load, the current load instruction, and the load radiant energy curve, the method further includes: Detect the full-band spectrum data of each point in the boiler furnace when the boiler unit is at its highest efficiency under different loads; For any load, based on the full-band spectrum data of each point in the boiler furnace under this load, the wavelength, hemispherical solid angle space and radiation surface area are integrated respectively to obtain the full-band radiation energy value under this load; Based on the load values ​​and full-band radiation energy values ​​under different loads, data fitting is performed to obtain the load radiation energy curve.

7. The control method of boiler combustion optimization logic configuration according to claim 1 is characterized in that: Before determining the target fuel quantity based on the target radiation energy and the radiation energy fuel quantity curve, the method further includes: Detect the full-band spectrum data of each point in the boiler furnace when the boiler unit is at its highest efficiency under different fuel amounts; For any amount of fuel, based on the full-band spectrum data of each point in the boiler furnace under this amount of fuel, the wavelength, hemispherical solid angle space and radiation surface area are integrated respectively to obtain the full-band radiation energy value under this amount of fuel; Based on the fuel amount and full-band radiation energy value under different fuel amounts, data fitting is performed to obtain the radiation energy fuel amount curve.

8. A control system for boiler combustion optimization logic configuration, characterized in that: include: A communication module is used to obtain the target load and current load instructions of the boiler unit; A processing module, configured to determine a target air volume based on the target load, the current load instruction, and the load air volume curve; The load air volume curve is used to characterize the air volume of the boiler unit when it is most efficient under different loads; Determine the target radiant energy based on the target load and the current load instruction, as well as the load radiant energy curve; the load radiant energy curve is used to characterize the radiant energy of the boiler unit when the efficiency is the highest under different loads; Based on the target radiation energy and the radiation energy fuel quantity curve, the target fuel quantity is determined; the radiation energy fuel quantity curve is used to characterize the corresponding relationship between the fuel quantity and the radiation energy of the boiler unit under different working conditions; Based on the target air volume and the target fuel volume, the logical configuration of the boiler generator set is regulated.

9. The control system of boiler combustion optimization logic configuration according to claim 8 is characterized in that: The processing module is specifically used to determine the load increase / decrease value and the load steady-state value based on the target load and the current load instruction; determine the dynamic air volume adjustment amount based on the load increase / decrease value and the load air volume curve corresponding to the load increase / decrease value; the load air volume curve includes a load air volume increase curve, a load air volume decrease curve and a load air volume steady-state curve; determine the steady-state air volume adjustment amount based on the load steady-state value and the load air volume steady-state curve; determine the target air volume based on the dynamic air volume adjustment amount, the steady-state air volume adjustment amount and the initial air volume given instruction.

10. The control system of boiler combustion optimization logic configuration according to claim 8, characterized in that: The processing module is specifically used to determine the load increase and decrease value and the load steady-state value based on the target load and the current load instruction; determine the dynamic adjustment amount of radiation energy based on the load increase and decrease value and the load radiation energy curve corresponding to the load increase and decrease value; the load radiation energy curve includes a load radiation energy increase curve, a load radiation energy decrease curve and a load radiation energy steady-state curve; Determining a steady-state adjustment amount of radiation energy based on the steady-state value of the load and a steady-state curve of radiation energy of the load; The target radiation energy is determined based on the radiation energy dynamic adjustment amount, the radiation energy steady-state adjustment amount and the initial radiation energy signal.

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