Thermal power plant wet desulphurization control method, device, equipment, medium and product

Abstract

The invention discloses a thermal power plant wet desulphurization control method, device, equipment, medium and product, and relates to the technical field of wet desulphurization control, the method comprises the following steps: determining the total amount of raw flue gas sulfur dioxide according to the unit load and the instantaneous amount of raw flue gas sulfur dioxide; judging whether the total amount of sulfur dioxide in the original flue gas is lower than a sulfur dioxide total amount threshold to obtain a first judgment result; if the first judgment result is yes, judging that the wet desulphurization system of the thermal power plant is in a unit deep peak regulation working condition; if the first judgment result is no, acquiring a circulating pump combination which is running in the wet desulphurization system of the thermal power plant as a current circulating pump combination; and completing wet desulphurization control according to the current circulating pump combination and the total amount of sulfur dioxide in the original flue gas. Wet desulphurization control is carried out based on the sulfur dioxide total amount threshold value, the current circulating pump combination and the original flue gas sulfur dioxide total amount, the control precision and efficiency of wet desulphurization of a thermal power plant can be improved, and then the power resource loss is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wet desulfurization control, and in particular to a method, device, equipment, medium and product for wet desulfurization control in a thermal power plant. Background Art

[0002] Thermal power plants generally adopt the limestone wet process technology route, which uses the limestone slurry and sulfur dioxide (SO2) in the flue gas to fully contact and react chemically in the absorption tower to produce gypsum (CaSO4), thereby purifying the flue gas emitted by the thermal power units.

[0003] There are many factors that affect the desulfurization efficiency, such as the sulfur content at the inlet of the absorber, the flue gas volume at the inlet of the absorber, the pH value of the slurry, the density of the slurry in the absorber, the circulation volume of the slurry, the fineness and density of the limestone slurry or the oxidation air volume, etc. The gypsum desulfurization currently has the following problems: first, the flow of the limestone slurry cannot be accurately controlled, resulting in excessive slurry supply and thus increasing the loss of power resources; second, the pump position combination of the slurry circulation pump cannot be predicted and accurately controlled, resulting in increased power resource loss; third, the standby slurry circulation pump has a long start-up time and cannot adapt to the load changes of the generator set; fourth, the current load rate of thermal power plants is generally low, and the units are in a deep peak-shaving state for a long time, and it is impossible to achieve a single slurry circulation pump operation mode, which also increases the loss of power resources. Summary of the invention

[0004] The purpose of this application is to provide a method, device, equipment, medium and product for controlling wet desulfurization in a thermal power plant, which can improve the control accuracy and efficiency of wet desulfurization in a thermal power plant, thereby reducing the loss of electric power resources.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a method for controlling wet desulfurization in a thermal power plant, wherein the method is applied to a wet desulfurization system in a thermal power plant, and the method comprises:

[0007] Obtain the unit load and instantaneous amount of sulfur dioxide in the original flue gas of the wet flue gas desulfurization system of the thermal power plant;

[0008] Determine the total amount of sulfur dioxide in the original flue gas based on the unit load and the instantaneous amount of sulfur dioxide in the original flue gas;

[0009] Determine whether the total amount of sulfur dioxide in the original flue gas is lower than the total amount of sulfur dioxide threshold, and obtain a first determination result;

[0010] If the first judgment result is yes, it is determined that the wet flue gas desulfurization system of the thermal power plant is in a deep peak load regulation condition of the unit;

[0011] If the first judgment result is no, then the circulating pump combination currently in operation in the wet flue gas desulfurization system of the thermal power plant is obtained as the current circulating pump combination;

[0012] Wet desulfurization control is completed based on the current circulation pump combination and the total amount of sulfur dioxide in the original flue gas.

[0013] Optionally, the total amount of sulfur dioxide in the original flue gas is:

[0014] SO 2_SUM =Q×P×α;

[0015] Among them, SO 2_SUM is the total amount of sulfur dioxide in the original flue gas, Q is the instantaneous amount of sulfur dioxide in the original flue gas, P is the unit load of the wet desulfurization system of the thermal power plant, and α is the correction coefficient.

[0016] Optionally, the total sulfur dioxide threshold is 1000.

[0017] Optionally, wet desulfurization control is completed according to the current circulation pump combination and the total amount of sulfur dioxide in the original flue gas, including:

[0018] Obtaining the interval corresponding to each circulating pump combination to be selected; the circulating pump combination to be selected corresponds to the interval one by one;

[0019] Determine the candidate circulating pump combination corresponding to the interval where the total amount of sulfur dioxide in the original flue gas is located as the target candidate circulating pump combination;

[0020] Determine whether the target circulation pump combination to be selected is the same as the current circulation pump combination to obtain a second determination result;

[0021] If the second judgment result is no, the wet flue gas desulfurization system of the thermal power plant is controlled to stop running the current circulating pump combination, and at the same time run the target circulating pump combination to be selected, and use the target circulating pump combination to be selected as the current circulating pump combination;

[0022] If the second judgment result is yes, then obtaining the slurry pH value of the wet flue gas desulfurization system of the thermal power plant;

[0023] Determine whether the pH value of the slurry satisfies the first slurry supply regulator opening adjustment condition or the second slurry supply regulator opening adjustment condition to obtain a third determination result;

[0024] If the third judgment result is no, return to the step of "obtaining the unit load of the wet flue gas desulfurization system of the thermal power plant and the instantaneous amount of sulfur dioxide in the original flue gas";

[0025] If the third judgment result is yes, then obtaining the instantaneous amount of sulfur dioxide at the outlet of the wet flue gas desulfurization system of the thermal power plant;

[0026] According to the instantaneous amount of sulfur dioxide at the outlet, the feedforward regulation principle is used to generate the slurry regulator opening adjustment instruction.

[0027] Optionally, the first slurry supply regulator opening adjustment condition is that the duration of the slurry pH value being lower than the first pH value threshold reaches a preset duration;

[0028] The opening adjustment condition of the second slurry supply regulator is that the time when the slurry pH value is higher than the second pH value threshold reaches a preset time; and the second pH value threshold is greater than the first pH value threshold.

[0029] Optionally, after determining that the wet flue gas desulfurization system of the thermal power plant is in a deep peak-shaving condition of the unit, the method further includes:

[0030] Control the wet flue gas desulfurization system of the thermal power plant to stop running the current circulation pump combination, and at the same time run the unit's deep peak-shaving condition circulation pump.

[0031] In a second aspect, the present application provides a thermal power plant wet desulfurization control device, the thermal power plant wet desulfurization control device applies the thermal power plant wet desulfurization control method, the thermal power plant wet desulfurization control device comprises:

[0032] The first data acquisition module is used to obtain the unit load of the wet flue gas desulfurization system of the thermal power plant and the instantaneous amount of sulfur dioxide in the original flue gas;

[0033] The total amount of sulfur dioxide in the original flue gas is determined by a module for determining the total amount of sulfur dioxide in the original flue gas according to the load of the unit and the instantaneous amount of sulfur dioxide in the original flue gas;

[0034] A judgment module is used to judge whether the total amount of sulfur dioxide in the original flue gas is lower than the total amount of sulfur dioxide threshold, and obtain a first judgment result; if the first judgment result is yes, the unit deep peak load condition judgment module is called; if the first judgment result is no, the second data acquisition module is called;

[0035] The unit deep peak-shaving operating condition determination module is used to determine whether the wet flue gas desulfurization system of a thermal power plant is in the unit deep peak-shaving operating condition;

[0036] The second data acquisition module is used to acquire the circulating pump combination in operation of the wet flue gas desulfurization system of the thermal power plant as the current circulating pump combination;

[0037] The wet desulfurization control module is used to complete the wet desulfurization control according to the current circulation pump combination and the total amount of sulfur dioxide in the original flue gas.

[0038] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-mentioned wet desulfurization control method for a thermal power plant.

[0039] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned wet desulfurization control method for a thermal power plant.

[0040] In a fifth aspect, the present application provides a computer program product, including a computer program, which implements the above-mentioned wet desulfurization control method for a thermal power plant when executed by a processor.

[0041] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0042] The present application provides a method, device, equipment, medium and product for controlling wet flue gas desulfurization in a thermal power plant. The method determines the total amount of sulfur dioxide in the original flue gas according to the unit load and the instantaneous amount of sulfur dioxide in the original flue gas; judges whether the total amount of sulfur dioxide in the original flue gas is lower than the total amount of sulfur dioxide threshold to obtain a first judgment result; if the first judgment result is yes, it is determined that the wet flue gas desulfurization system of the thermal power plant is in a deep peak-shaving condition of the unit; if the first judgment result is no, the circulating pump combination currently in operation in the wet flue gas desulfurization system of the thermal power plant is obtained as the current circulating pump combination; and completes the wet flue gas desulfurization control according to the current circulating pump combination and the total amount of sulfur dioxide in the original flue gas.

[0043] The present application also provides a wet flue gas desulfurization control device for a thermal power plant, which can perform one-button start-stop-standby control of a slurry circulation pump, has a quick start function, and can adapt to various changes in operating conditions; the slurry supply amount can be accurately controlled by adjusting the opening of the slurry supply regulator to minimize the consumption of limestone; the slurry circulation pump position combination can be accurately predicted and guided to achieve the best operating mode, save plant electricity to the greatest extent, and accurately control the SO2 content at the flue gas outlet. SO2 can be controlled under the environmental protection assessment line to achieve energy-saving effects while ensuring the safety of environmental protection indicators and the quality of the slurry; through the specific control of the deep peak regulation and operating conditions of the generator set, safe and stable operation can be achieved under the single pump operation mode, with significant energy-saving effects, thereby realizing accurate, energy-saving, and intelligent control of the full-load section of the thermal power plant limestone wet flue gas desulfurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 This is a schematic diagram of the structure of a wet desulfurization system for a thermal power plant in one embodiment of the present application.

[0046] Figure 2 This is a flow chart of a wet desulfurization control method for a thermal power plant in one embodiment of the present application.

[0047] Figure 3 This is a flow chart of sulfur dioxide regulation and change prediction in one embodiment of the present application.

[0048] Figure 4 This is a schematic structural diagram of a wet desulfurization control device for a thermal power plant in one embodiment of the present application.

[0049] Figure 5 This is a one-button start-stop-standby control flow chart in one embodiment of the present application.

[0050] Figure 6 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0053] In an exemplary embodiment, a method for controlling wet desulfurization in a thermal power plant is provided. The method for controlling wet desulfurization in a thermal power plant is applied to a wet desulfurization system in a thermal power plant. The wet desulfurization system in a thermal power plant is as follows: Figure 1 shown.

[0054] like Figure 2 As shown, the wet desulfurization control method for a thermal power plant comprises:

[0055] Step 101: Obtain the unit load of the wet flue gas desulfurization system of the thermal power plant and the instantaneous amount of sulfur dioxide in the original flue gas.

[0056] Step 102: Determine the total amount of sulfur dioxide in the original flue gas according to the unit load and the instantaneous amount of sulfur dioxide in the original flue gas. The total amount of sulfur dioxide in the original flue gas is:

[0057] SO 2_SUM =Q×P×α.

[0058] Among them, SO 2_SUMis the total amount of sulfur dioxide in the original flue gas, Q is the instantaneous amount of sulfur dioxide in the original flue gas, P is the unit load of the wet desulfurization system of the thermal power plant, and α is the correction coefficient.

[0059] Step 103: Determine whether the total amount of sulfur dioxide in the original flue gas is lower than the total amount of sulfur dioxide threshold, and obtain a first determination result. The total amount of sulfur dioxide threshold is 1000.

[0060] Step 104: If the first judgment result is yes, it is determined that the thermal power plant wet flue gas desulfurization system is in the unit deep peak load condition. The thermal power plant wet flue gas desulfurization system is controlled to stop running the current circulation pump combination, and at the same time run the unit deep peak load condition circulation pump.

[0061] Step 105: If the first judgment result is no, the circulating pump combination currently in operation in the wet flue gas desulfurization system of the thermal power plant is obtained as the current circulating pump combination.

[0062] Step 106: Complete wet flue gas desulfurization control according to the current circulation pump combination and the total amount of sulfur dioxide in the original flue gas.

[0063] Step 106 includes:

[0064] Get the interval corresponding to each circulating pump combination to be selected. The circulating pump combination to be selected corresponds to the interval one by one.

[0065] Determine the candidate circulating pump combination corresponding to the interval where the total amount of sulfur dioxide in the original flue gas is located as the target candidate circulating pump combination.

[0066] It is determined whether the target circulation pump combination to be selected is the same as the current circulation pump combination to obtain a second determination result.

[0067] If the second judgment result is no, the wet desulfurization system of the thermal power plant is controlled to stop running the current circulation pump combination, and at the same time run the target circulation pump combination to be selected, and use the target circulation pump combination to be selected as the current circulation pump combination.

[0068] If the second judgment result is yes, the pH value of the slurry in the wet flue gas desulfurization system of the thermal power plant is obtained.

[0069] Determine whether the slurry pH value satisfies the first slurry supply regulator opening adjustment condition or the second slurry supply regulator opening adjustment condition to obtain a third judgment result. The first slurry supply regulator opening adjustment condition is that the duration of the slurry pH value lower than the first pH value threshold reaches a preset duration. The second slurry supply regulator opening adjustment condition is that the duration of the slurry pH value higher than the second pH value threshold reaches a preset duration. The second pH value threshold is greater than the first pH value threshold.

[0070] If the third judgment result is no, return to the step of "obtaining the unit load of the wet flue gas desulfurization system of the thermal power plant and the instantaneous amount of sulfur dioxide in the original flue gas".

[0071] If the third judgment result is yes, the instantaneous amount of sulfur dioxide at the outlet of the wet flue gas desulfurization system of the thermal power plant is obtained.

[0072] According to the instantaneous amount of sulfur dioxide at the outlet, the feedforward regulation principle is used to generate the slurry regulator opening adjustment command. Feedforward regulation principle: Use the change rate (increase and decrease) of the instantaneous amount of sulfur dioxide at the outlet as the feedforward of the slurry regulator opening command, so that the regulation system can act quickly in advance and change the slurry flow rate to adapt to the needs of changing working conditions.

[0073] In an exemplary embodiment, a thermal power plant wet desulfurization control device is provided. The thermal power plant wet desulfurization control device applies a thermal power plant wet desulfurization control method. The thermal power plant wet desulfurization control device comprises:

[0074] The first data acquisition module is used to obtain the unit load of the wet flue gas desulfurization system of the thermal power plant and the instantaneous amount of sulfur dioxide in the original flue gas.

[0075] The module for determining the total amount of sulfur dioxide in the original flue gas is used to determine the total amount of sulfur dioxide in the original flue gas according to the unit load and the instantaneous amount of sulfur dioxide in the original flue gas.

[0076] The judgment module is used to judge whether the total amount of sulfur dioxide in the original flue gas is lower than the total amount of sulfur dioxide threshold, and obtain a first judgment result. If the first judgment result is yes, the unit deep peak load condition judgment module is called. If the first judgment result is no, the second data acquisition module is called.

[0077] The unit deep peak-shaving operating condition determination module is used to determine whether the wet flue gas desulfurization system of a thermal power plant is in the unit deep peak-shaving operating condition.

[0078] The second data acquisition module is used to obtain the circulating pump combination currently in operation in the wet flue gas desulfurization system of the thermal power plant as the current circulating pump combination.

[0079] The wet desulfurization control module is used to complete the wet desulfurization control according to the current circulation pump combination and the total amount of sulfur dioxide in the original flue gas.

[0080] In an exemplary embodiment, Figure 4 , provides a wet desulfurization control device for a thermal power plant, including: a total sulfur content calculation module, a slurry circulation pump position prediction and guidance module, a limestone slurry supply amount adjustment and pH control module, a desulfurization control module under unit deep peak regulation (low load) conditions, and a slurry circulation pump one-button start-stop-standby module.

[0081] 1) Total sulfur calculation module.

[0082] Determine the total amount of sulfur dioxide in the original flue gas based on the unit load and the instantaneous amount of sulfur dioxide in the original flue gas.

[0083] Among them, the instantaneous amount of sulfur dioxide in the original flue gas is measured by the on-site CEMS (flue gas analyzer) meter; the unit load is obtained on the network through the DCS system (distributed control system) highway (ie, data transmission channel).

[0084] 2) Slurry circulation pump position prediction and guidance module

[0085] Because the power of the circulating pump (generally four circulating pumps are configured) and the installation height of the outlet slurry supply pipe on the absorption tower are different, the desulfurization capacity of each pump is different. Through field tests, when the load of the generator set remains unchanged, the change of outlet sulfur content in different pump position combinations is used to obtain the desulfurization capacity PUMPQ (quantitative description of the desulfurization capacity of the slurry circulating pump) data of each pump, and the number of pumps to be operated and the best pump position combination scheme are calculated according to the total sulfur content value, which are 12 combinations, 13 combinations, 14 combinations, 23 combinations, 24 combinations, 34 or 123 combinations and single pump operation, etc.

[0086] Pump position combination = F(SO 2_SUM , PUMPQ).

[0087] PUMPQ is the quantitative description data of the desulfurization capacity of the slurry circulation pump, and F represents the pump position combination determination algorithm.

[0088] 3) Limestone slurry supply adjustment and pH control module

[0089] like Figure 3 , using feedforward, inertia and other algorithms, through the combination of ST language (scripting language or computer programming language) and SAMA diagram (a standard developed by the American Society of Scientific Instruments, using standardized legend symbols to represent control system logic or program), according to the instantaneous value and change rate of SO2 at the flue gas inlet and outlet, predict the future change trend, and calculate the opening of the slurry regulator in real time in combination with the slurry pH value, so as to adjust the slurry supply and realize closed-loop regulation of net flue gas SO2, so that it changes within the set range, ensuring the safety of environmental protection indicators, while minimizing the consumption of limestone.

[0090] 4) Desulfurization control module under deep peak load (low load) conditions

[0091] Deep peak load regulation generally refers to the load reduction of the unit to below 20% PE (20% of the rated load of the generator set). At this time, the flue gas volume is small. At this time, running a high-level circulation pump can meet the needs. However, at present, general power plants often run 2 or 3 pumps because the circulation pump does not have the conditions for rapid start-up and the proprietary control of the operation of a single pump, resulting in waste of power in the plant. When the system enters the deep peak load regulation condition, the program automatically or manually completes the conversion of the operation mode of a single pump (the top pump) and automatically completes the entry of other pumps into the standby state. At this time, at least one pump is in the standby state.

[0092] 5) One-button start-stop-standby module for slurry circulation pump

[0093] The desulfurization slurry circulation pump in a thermal power plant is generally a 6KV motor with a power between 800KW and 1100KW. The start-stop-standby of the pump requires the linkage of a series of equipment such as the flushing water gate, sewage gate, and outlet gate. Therefore, the process time is relatively long and manual operation is relatively cumbersome. Therefore, a one-button start-stop-standby program that does not require human intervention is specially designed. The operator only needs to click the corresponding button on the monitoring screen to achieve the above functions. The program automatically completes the switching of the flushing water gate and sewage gate, automatic flushing and sewage discharge of the pipeline and pump body, outlet door switching, and motor start and stop control.

[0094] The device first calculates the total sulfur content in the original flue gas in real time by the total sulfur calculation module, and then the slurry circulation pump pump position prediction and guidance module gives real-time guidance on the pump position combination, guiding the system to operate according to the best combination to maximize the desulfurization efficiency; the limestone slurry supply adjustment and pH control module takes into account the quality of the limestone slurry, and the closed-loop net flue gas SO2 instantaneous value (if the slurry pH value is lower than 4.7 or higher than 6.1 for more than 2 hours, it will cause a decrease in desulfurization efficiency or slurry deposition), and calculates the opening instruction of the slurry supply regulator in real time. When the pump position combination does not need to be changed to control the net flue gas SO2 to be qualified, the slurry supply regulator opening is adjusted first, otherwise the pump position combination is changed first; desulfurization control under deep peak regulation (low load) conditions of the unit The module is a special control based on the total sulfur content calculation module, the slurry circulation pump position prediction and guidance module, the limestone slurry supply amount adjustment and pH control module and the slurry circulation pump one-key start-stop-standby module. It is designed to operate the top circulation pump when the total sulfur content in the flue gas is extremely low (generally less than 1000 units), and cooperate with the control of the slurry supply regulator to achieve the regulation and control of the instantaneous value of net flue gas SO2; the slurry circulation pump one-key start-stop-standby module is the most prerequisite for this system. Only by realizing the function of this module can the limestone slurry supply amount adjustment and pH control module and the desulfurization control module under the deep peak regulation (low load) condition of the unit play a normal role, and the function of the slurry circulation pump pump position prediction and guidance module is meaningful.

[0095] This device accurately predicts and controls the pump position combination of the slurry circulation pump, maximizes the performance of the equipment, and runs energy-saving while ensuring environmental protection indicators; accurately controls the supply of limestone slurry, and runs energy-saving while ensuring slurry quality, slurry safety, and environmental protection indicators; realizes one-key standby of the slurry circulation pump, combined with one-key start and stop control of the slurry circulation pump, to achieve rapid start; formulates control strategies and intelligent control functions under the deep peak-shaving conditions of the unit, and runs energy-saving while ensuring slurry quality, slurry safety, and environmental protection indicators. The power of the circulating pump motor is generally 800KW-1100KW. According to the minimum power calculation, reducing the operation of one pump saves 19200KWh of plant electricity per day, which is converted to about 7000 yuan according to the on-grid electricity price of 0.37 yuan. The load reduction control of the generator set in the thermal power plant is completed by the generator set coordination control system, and the desulfurization system collects the unit load signal through the unit DCS system.

[0096] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 6 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a device bus, and the communication interface is connected to the device bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating device, a computer program and a database. The internal memory provides an environment for the operation of the operating device and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a wet desulfurization control method for a thermal power plant is implemented.

[0097] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0098] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0099] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0100] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0101] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0102] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0103] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for controlling wet desulfurization in a thermal power plant, characterized in that: The wet desulfurization control method for a thermal power plant is applied to a wet desulfurization system of a thermal power plant. The wet desulfurization control method for a thermal power plant comprises: Obtain the unit load and instantaneous amount of sulfur dioxide in the original flue gas of the wet flue gas desulfurization system of the thermal power plant; Determine the total amount of sulfur dioxide in the original flue gas based on the unit load and the instantaneous amount of sulfur dioxide in the original flue gas; Determine whether the total amount of sulfur dioxide in the original flue gas is lower than the total amount of sulfur dioxide threshold, and obtain a first determination result; If the first judgment result is yes, it is determined that the wet flue gas desulfurization system of the thermal power plant is in a deep peak load regulation condition of the unit; If the first judgment result is no, then the circulating pump combination currently in operation in the wet flue gas desulfurization system of the thermal power plant is obtained as the current circulating pump combination; Wet desulfurization control is completed based on the current circulation pump combination and the total amount of sulfur dioxide in the original flue gas.

2. The method for controlling wet desulfurization in a thermal power plant according to claim 1, characterized in that: The total amount of sulfur dioxide in the original flue gas is: SO 2_SUM =Q×P×α; Among them, SO 2_SUM is the total amount of sulfur dioxide in the original flue gas, Q is the instantaneous amount of sulfur dioxide in the original flue gas, P is the unit load of the wet desulfurization system of the thermal power plant, and α is the correction coefficient.

3. The method for controlling wet desulfurization in a thermal power plant according to claim 1, characterized in that: The total sulfur dioxide threshold is 1000.

4. The method for controlling wet desulfurization in a thermal power plant according to claim 1, characterized in that: According to the current circulation pump combination and the total amount of sulfur dioxide in the original flue gas, complete the wet desulfurization control, including: Obtaining the interval corresponding to each circulating pump combination to be selected; the circulating pump combination to be selected corresponds to the interval one by one; Determine the candidate circulating pump combination corresponding to the interval where the total amount of sulfur dioxide in the original flue gas is located as the target candidate circulating pump combination; Determine whether the target circulating pump combination to be selected is the same as the current circulating pump combination to obtain a second determination result; If the second judgment result is no, the wet flue gas desulfurization system of the thermal power plant is controlled to stop running the current circulating pump combination, and at the same time run the target circulating pump combination to be selected, and use the target circulating pump combination to be selected as the current circulating pump combination; If the second judgment result is yes, then obtaining the slurry pH value of the wet flue gas desulfurization system of the thermal power plant; Determine whether the pH value of the slurry satisfies the first slurry supply regulator opening adjustment condition or the second slurry supply regulator opening adjustment condition to obtain a third determination result; If the third judgment result is no, return to step "obtaining the unit load of the wet flue gas desulfurization system of the thermal power plant and the instantaneous amount of sulfur dioxide in the original flue gas"; If the third judgment result is yes, then obtaining the instantaneous amount of sulfur dioxide at the outlet of the wet flue gas desulfurization system of the thermal power plant; According to the instantaneous amount of sulfur dioxide at the outlet, the feedforward regulation principle is used to generate the slurry regulator opening adjustment instruction.

5. The method for controlling wet desulfurization in a thermal power plant according to claim 4, characterized in that: The first slurry supply regulator opening adjustment condition is that the duration of the slurry pH value being lower than the first pH value threshold reaches a preset duration; The opening adjustment condition of the second slurry supply regulator is that the time when the slurry pH value is higher than the second pH value threshold reaches a preset time; and the second pH value threshold is greater than the first pH value threshold.

6. The method for controlling wet desulfurization in a thermal power plant according to claim 1, characterized in that: After determining that the wet flue gas desulfurization system of a thermal power plant is in the deep peak load regulation condition of the unit, it also includes: Control the wet flue gas desulfurization system of the thermal power plant to stop running the current circulation pump combination, and at the same time run the unit's deep peak-shaving condition circulation pump.

7. A wet desulfurization control device for a thermal power plant, characterized in that: The wet desulfurization control device for a thermal power plant applies the wet desulfurization control method for a thermal power plant according to any one of claims 1 to 6, and the wet desulfurization control device for a thermal power plant comprises: The first data acquisition module is used to obtain the unit load of the wet flue gas desulfurization system of the thermal power plant and the instantaneous amount of sulfur dioxide in the original flue gas; The total amount of sulfur dioxide in the original flue gas is determined by a module for determining the total amount of sulfur dioxide in the original flue gas according to the load of the unit and the instantaneous amount of sulfur dioxide in the original flue gas; A judgment module is used to judge whether the total amount of sulfur dioxide in the original flue gas is lower than the total amount of sulfur dioxide threshold, and obtain a first judgment result; if the first judgment result is yes, the unit deep peak load condition judgment module is called; if the first judgment result is no, the second data acquisition module is called; The unit deep peak-shaving operating condition determination module is used to determine whether the wet flue gas desulfurization system of a thermal power plant is in the unit deep peak-shaving operating condition; The second data acquisition module is used to acquire the circulating pump combination in operation of the wet flue gas desulfurization system of the thermal power plant as the current circulating pump combination; The wet desulfurization control module is used to complete the wet desulfurization control according to the current circulation pump combination and the total amount of sulfur dioxide in the original flue gas.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the wet desulfurization control method for a thermal power plant according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the wet desulfurization control method for a thermal power plant according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the wet desulfurization control method for a thermal power plant according to any one of claims 1 to 6 is implemented.

Images