Flue gas purification treatment method, device and equipment for coal-fired power plant

Abstract

The embodiment of the invention provides a flue gas purification treatment method, device and equipment for a coal-fired power plant. The method comprises the following steps: acquiring the current load of the coal-fired power plant; controlling the ammonia spraying amount of the denitration system according to the current load; controlling desulfurization slurry of the desulfurization system according to the current load; obtaining the current carbon capture efficiency; and controlling the carbon capture system according to the current load and / or the current carbon capture efficiency. In this way, three-linkage and coordinated control over denitration, desulfurization and carbon capture of the flue gas can be achieved, the flue gas purification efficiency is improved, and the flue gas purification time is effectively shortened.

Description

Technical Field

[0001] The present disclosure relates to the field of flue gas treatment, and in particular to the technical field of flue gas purification treatment in coal-fired power plants. Background Art

[0002] At present, environmental protection requirements are becoming increasingly stringent, and the quality requirements for flue gas emitted by various factories such as power plants are also getting higher and higher. It is required that the concentrations of toxic and harmful gases, nitrogen oxides NOx, sulfides and other pollutants in the flue gas emitted by industrial equipment such as coal-fired boilers must meet certain conditions before they can be discharged. Otherwise, it will affect the air quality and cause environmental pollution. The existing flue gas purification method is to pass the flue gas into purification equipment located in different positions. This purification method lacks coordinated control, resulting in low flue gas purification efficiency, long purification time and other problems. Summary of the Invention

[0003] The present disclosure provides a flue gas purification method, device, equipment and storage medium for a coal-fired power plant.

[0004] According to a first aspect of the present disclosure, a flue gas purification method for a coal-fired power plant is provided. The method is applicable to a flue gas purification system of a coal-fired power plant, wherein the flue gas purification system of the coal-fired power plant includes a denitrification system, a desulfurization system, and a carbon capture system, wherein the denitrification system is connected to the desulfurization system, and the desulfurization system is connected to the carbon capture system. The method comprises:

[0005] Obtaining the current load of the coal-fired power plant;

[0006] controlling the ammonia injection amount of the denitration system according to the current load;

[0007] controlling the desulfurization slurry of the desulfurization system according to the current load;

[0008] Obtain current carbon capture efficiency;

[0009] The carbon capture system is controlled according to the current load and / or the current carbon capture efficiency.

[0010] According to the above aspects and any possible implementation, an implementation is further provided, wherein the controlling the ammonia injection amount of the denitration system according to the current load includes:

[0011] Determining whether the current load becomes lower or higher;

[0012] If the current load becomes lower, the opening of the denitration ammonia injection valve of the denitration system is reduced to reduce the amount of ammonia injection;

[0013] If the current load becomes higher, the opening of the denitration ammonia injection valve of the denitration system is increased to increase the ammonia injection amount.

[0014] According to the above aspects and any possible implementation, an implementation is further provided, wherein the controlling of the desulfurization slurry of the desulfurization system according to the current load comprises:

[0015] Determining whether the current load becomes lower or higher;

[0016] If the current load becomes lower, the desulfurization slurry pump power of the desulfurization system is reduced to reduce the desulfurization slurry;

[0017] If the current load becomes higher, the desulfurization slurry pump power of the desulfurization system is increased to increase the desulfurization slurry.

[0018] According to the above aspects and any possible implementation, an implementation is further provided, wherein an induced draft fan is connected between the desulfurization system and the carbon capture system; the induced draft fan is used to introduce the flue gas desulfurized by the desulfurization system into the carbon capture system; and the method further comprises:

[0019] If the current load becomes lower, reducing the power of the induced draft fan;

[0020] If the current load becomes higher, the power of the induced draft fan is increased.

[0021] According to the above aspects and any possible implementation, there is further provided an implementation, wherein a heat compensation system is connected between the desulfurization system and the carbon capture system, and the heat compensation system is used to heat the carbon oxide-adsorbed desorption liquid flowing out of the carbon capture system using the heat of the outflowing heat exchange medium;

[0022] The controlling the carbon capture system according to the current load and / or the current carbon capture efficiency includes:

[0023] If the current load becomes higher, the heating power and heat exchange medium flow of the heat compensation system are reduced to reduce the amount of heat applied to the analytical solution.

[0024] According to the above aspects and any possible implementation, there is further provided an implementation, wherein a heat compensation system is connected between the desulfurization system and the carbon capture system, and the heat compensation system is used to heat the desorption liquid adsorbed with carbon oxides flowing out of the carbon capture system;

[0025] The controlling the carbon capture system according to the current load and / or the current carbon capture efficiency includes:

[0026] If the current load is higher than the preset load and the current carbon capture efficiency is lower than the preset carbon capture efficiency, the heating power and the flow rate of the heat exchange medium of the heat compensation system are increased to increase the heat of the desorption liquid.

[0027] According to the above aspects and any possible implementation, there is further provided an implementation, wherein the desulfurization system includes a flue gas desulfurization absorption tower;

[0028] The heat compensation system includes: a desulfurization slurry flash tank, an absorption heat pump and a heat exchanger, wherein the desulfurization slurry flash tank is connected to the bottom of the flue gas desulfurization absorption tower, and is used to evaporate the desulfurization slurry flowing out of the bottom of the flue gas desulfurization absorption tower into gaseous desulfurization slurry, and the gaseous desulfurization slurry flows out of the desulfurization slurry flash tank and enters the absorption heat pump; the absorption heat pump is used to heat the inflowing gaseous desulfurization slurry, and then enters the heat exchanger for heat exchange to heat the desorption liquid, and after heat exchange, refluxes to the bottom of the flue gas desulfurization absorption tower;

[0029] The heating power of the thermal compensation system is regulated by the power of the absorption heat pump;

[0030] The carbon capture system includes: a carbon capture absorption tower, a carbon capture regeneration tower and a reboiler;

[0031] The carbon capture absorption tower contains a desorbed solution, which is used to adsorb carbon oxides in the desulfurized flue gas after the flue gas is passed into the flue gas desulfurization absorption tower, and is discharged from the bottom to enter the reboiler;

[0032] The reboiler is connected to the bottom of the carbon capture absorption tower, the bottom of the carbon capture regeneration tower, and the heat exchanger respectively; the desorption liquid adsorbed with carbon oxides enters the reboiler for heating, flows into the heat exchanger for further heating, and then enters the top of the carbon capture regeneration tower;

[0033] The carbon capture regeneration tower is used to reduce the analytical solution adsorbed with carbon oxides to the analytical solution. The reduced analytical solution flows into the reboiler and then flows into the top of the carbon capture absorption tower through the reboiler.

[0034] According to a second aspect of the present disclosure, a flue gas purification system for a coal-fired power plant is provided. The system includes: a denitrification system, a desulfurization system, a carbon capture system, and a linkage control system. The denitrification system is connected to the desulfurization system, the desulfurization system is connected to the carbon capture system, and the linkage control system is connected to the denitrification system, the desulfurization system, and the carbon capture system. The linkage control system includes:

[0035] A first acquisition module is used to obtain the current load of the coal-fired power plant;

[0036] A first control module is used to control the ammonia injection amount of the denitration system according to the current load;

[0037] a second control module, configured to control the desulfurization slurry of the desulfurization system according to the current load;

[0038] The second acquisition module is used to obtain the current carbon capture efficiency;

[0039] A third control module is configured to control the carbon capture system according to the current load and / or the current carbon capture efficiency.

[0040] According to a third aspect of the present disclosure, an electronic device is provided, comprising: a memory and a processor, wherein the memory stores a computer program for flue gas purification in coal-fired power plants, and the processor implements the above method when executing the program.

[0041] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the method according to the first aspect of the present disclosure is implemented.

[0042] In the present disclosure, after obtaining the current load of the coal-fired power plant, the ammonia injection amount of the denitrification system can be controlled according to the current load, the desulfurization slurry of the desulfurization system can be controlled according to the current load, and the carbon capture system can be controlled according to the current load and / or the current carbon capture efficiency. In this way, the three-linkage and coordinated control of flue gas denitrification, desulfurization and carbon capture can be achieved, the flue gas purification efficiency can be improved, and the flue gas purification time can be effectively shortened.

[0043] It should be understood that the contents described in the Summary of the Invention section are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are provided for a better understanding of the present disclosure and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:

[0045] Figure 1 A flow chart showing a flue gas purification method for a coal-fired power plant according to an embodiment of the present disclosure is shown;

[0046] Figure 2 A schematic diagram of a flue gas purification system for a coal-fired power plant according to an embodiment of the present disclosure is shown;

[0047] Figure 3 A block diagram of a flue gas purification system for a coal-fired power plant according to an embodiment of the present disclosure is shown;

[0048] Figure 4 A block diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure is shown.

[0049] Figure 2 The corresponding relationship between the components and numbers is as follows:

[0050] SCR reactor 1, bag filter 2, flue gas desulfurization absorption tower 3, carbon capture absorption tower 4, carbon capture regeneration tower, induced draft fan 6, desulfurization slurry flash tank 7, absorption heat pump 8, heat exchanger 9, cooler 10, reboiler 11, ammonia injector 12, slurry circulation pump 13, heat exchanger hot side flow valve 14, flash tank steam outlet regulating valve 15, main steam inlet heat pump flow valve 16. DETAILED DESCRIPTION

[0051] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0052] In this document, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0053] Figure 1 The flow chart of the flue gas purification method 100 of a coal-fired power plant according to an embodiment of the present disclosure is shown. The method 100 is applicable to a flue gas purification system of a coal-fired power plant, such as Figure 2 The system shown integrates a denitrification system, a desulfurization system, and a carbon capture system. The denitrification system is connected to the desulfurization system, and the desulfurization system is connected to the carbon capture system. The flue gas purification system integrates the three systems of the denitrification system, the desulfurization system, and the carbon capture system, and can realize denitrification, desulfurization, and carbon capture in one, realizing three linkages. The flue gas purification system of the coal-fired power plant is connected to the unit of the coal-fired power plant upstream, and the flue gas from the unit enters the denitrification system of the flue gas purification system of the coal-fired power plant. The method includes:

[0054] Step 110, obtaining the current load of the coal-fired power plant;

[0055] The current load includes but is not limited to the load of the coal-fired power plant boiler, such as the amount of coal in the boiler, temperature, pressure, liquid level, water vapor evaporation rate, unit output heat, rated power generation, etc.

[0056] Step 120, controlling the ammonia injection amount of the denitration system according to the current load;

[0057] The denitration system is used to supply flue gas and ammonia injected by the ammonia injector 12 into the catalyst layer, so that nitrogen oxides in the flue gas and ammonia react under the action of the catalyst to produce nitrogen and water;

[0058] Step 130, controlling the desulfurization slurry of the desulfurization system according to the current load;

[0059] The desulfurization slurry can be made of limestone powder and water.

[0060] The sulfur dioxide in the flue gas undergoes an oxidation reaction with the calcium carbonate in the slurry and the air blown in from the bottom of the flue gas desulfurization absorption tower 3 to form calcium sulfate. When the calcium sulfate reaches a certain saturation, it crystallizes to form dihydrate gypsum.

[0061] Step 140, obtaining current carbon capture efficiency;

[0062] Step 150: Control the carbon capture system according to the current load and / or the current carbon capture efficiency.

[0063] After obtaining the current load of the coal-fired power plant, the ammonia injection amount of the denitrification system can be controlled according to the current load, the desulfurization slurry of the desulfurization system can be controlled according to the current load, and the carbon capture system can be controlled according to the current load and / or the current carbon capture efficiency. In this way, the three-linkage and coordinated control of flue gas denitrification, desulfurization and carbon capture can be achieved, the flue gas purification efficiency can be improved, and the flue gas purification time can be effectively shortened.

[0064] In some embodiments, controlling the amount of ammonia injected into the denitrification system according to the current load includes:

[0065] Determining whether the current load becomes lower or higher;

[0066] If the current load becomes lower, the opening of the denitration ammonia injection valve of the denitration system is reduced to reduce the amount of ammonia injection;

[0067] If the current load becomes higher, the opening of the denitration ammonia injection valve of the denitration system is increased to increase the ammonia injection amount.

[0068] If the current load becomes lower, it means that the burden on the coal-fired power plant units becomes lower, and the pollutants in the flue gas will naturally become less. Therefore, the opening of the denitrification ammonia injection valve can be adjusted to a smaller degree, thereby reducing the amount of ammonia injection and avoiding excessive ammonia injection. If the current load becomes higher, it means that the burden on the coal-fired power plant units becomes greater, and the pollutants in the flue gas will naturally become more. Therefore, the opening of the denitrification ammonia injection valve can be adjusted to a larger degree, thereby increasing the amount of ammonia injection and avoiding insufficient ammonia injection. In this way, the ammonia injection amount can be adjusted dynamically and intelligently according to the load changes of the coal-fired power plant.

[0069] In some embodiments, controlling the desulfurization slurry of the desulfurization system according to the current load includes:

[0070] Determining whether the current load becomes lower or higher;

[0071] If the current load becomes lower, the desulfurization slurry pump of the desulfurization system is reduced. Figure 2 The slurry circulation pump power in order to reduce the desulfurization slurry;

[0072] If the current load becomes higher, the desulfurization slurry pump power of the desulfurization system is increased to increase the desulfurization slurry.

[0073] If the current load becomes lower, it means that the burden on the coal-fired power plant units becomes lower, and the pollutants in the flue gas will naturally become less. Therefore, the power of the desulfurization slurry pump can be reduced to reduce the desulfurization slurry and avoid excessive desulfurization slurry; if the current load becomes higher, it means that the burden on the coal-fired power plant units becomes greater, and the pollutants in the flue gas will naturally become more. Therefore, the power of the desulfurization slurry pump can be increased to increase the desulfurization slurry and avoid insufficient desulfurization slurry. In this way, the amount of desulfurization slurry can be dynamically and intelligently adjusted according to the load changes of the coal-fired power plant to ensure the desulfurization effect while avoiding wasting electricity.

[0074] In some embodiments, an induced draft fan is connected between the desulfurization system and the carbon capture system. Figure 2 6; the induced draft fan is used to introduce the flue gas desulfurized by the desulfurization system into the carbon capture system; the method further includes:

[0075] If the current load becomes lower, reducing the power of the induced draft fan;

[0076] If the current load becomes higher, the power of the induced draft fan is increased.

[0077] like Figure 2 As shown, the induced draft fan is used to pump the flue gas from the desulfurization system into the carbon capture system so that the carbon capture system can remove carbon dioxide from the flue gas. Specifically:

[0078] If the current load becomes lower, it means that there is less carbon dioxide in the flue gas. In this way, the power of the induced draft fan can be reduced. In this way, the flue gas entering the carbon capture system from the desulfurization system per unit time will become less, and the carbon dioxide in the flue gas can react with the decomposition liquid in the carbon capture system to remove the carbon dioxide in the flue gas. After reducing the power of the induced draft fan, the air volume becomes smaller, so the carbon dioxide in the flue gas has a longer contact time with the decomposition liquid in the carbon capture system. In this way, the carbon capture rate of the carbon capture system can be improved while reducing energy consumption.

[0079] If the current load becomes higher, it means that there is more carbon dioxide in the flue gas. In this case, the induced draft fan power can be increased. After the increase, the air volume becomes larger, and more flue gas enters the carbon capture system per unit time to react with the decomposition liquid to remove the carbon dioxide in the flue gas, thereby improving the carbon capture rate of the carbon capture system.

[0080] In some embodiments, a heat compensation system is connected between the desulfurization system and the carbon capture system, and the heat compensation system is used to heat the desorption liquid adsorbed with carbon oxides such as carbon dioxide flowing out of the carbon capture system using the heat of the outflowing heat exchange medium;

[0081] The carbon capture system includes a carbon capture absorption tower and a carbon capture regeneration tower. The analytical solution is a composite solution in the carbon capture absorption tower, which reacts with the carbon dioxide in the flue gas entering through the induced draft fan, and then separates the carbon dioxide from the flue gas; and the analytical solution adsorbed with carbon dioxide after the reaction will flow out from the bottom of the carbon capture absorption tower 4 and then flow into the carbon capture regeneration tower 5 through the reboiler 11 and the heat exchanger 9. Under certain conditions, the analytical solution adsorbed with carbon dioxide in the carbon capture regeneration tower will decompose, thereby releasing carbon dioxide.

[0082] The controlling the carbon capture system according to the current load and / or the current carbon capture efficiency includes:

[0083] If the current load becomes higher, the heating power and heat exchange medium flow of the heat compensation system are reduced to reduce the amount of heat applied to the analytical solution.

[0084] If the current load becomes higher, the flue gas temperature will be appropriately higher, so the heating power of the heat compensation system can be reduced, such as reducing Figure 2 If the speed of the absorption heat pump compressor 8 and the flow rate of the heat exchange medium are reduced Figure 2 The opening degree of the flow valve opening 14 on the hot side of the intermediate heat exchanger and / or the opening degree of the flash tank steam outlet regulating valve 15 can be adjusted to reduce energy consumption.

[0085] In some embodiments, a heat compensation system is connected between the desulfurization system and the carbon capture system, and the heat compensation system is used to heat the desorption liquid adsorbed with carbon oxides flowing out of the carbon capture system;

[0086] The controlling the carbon capture system according to the current load and / or the current carbon capture efficiency includes:

[0087] If the current load is higher than the preset load and the current carbon capture efficiency is lower than the preset carbon capture efficiency, the heating power and the flow rate of the heat exchange medium of the heat compensation system are increased to increase the heat of the desorption liquid.

[0088] If the current load is higher than the preset load and the current carbon capture efficiency is lower than the preset carbon capture efficiency, it means that the load is greater. In order to increase the carbon capture efficiency, the decomposition liquid can be further heated. Specifically, the heating power and the heat exchange medium flow rate of the heat compensation system can be increased. In this way, more heat exchange medium and a larger flow rate will be used to heat the decomposition liquid, which naturally can exchange more heat for the decomposition liquid to further increase the temperature of the decomposition liquid, thereby increasing the reaction rate of the decomposition liquid with carbon dioxide and improving the adsorption efficiency of the decomposition liquid.

[0089] like Figure 2 As shown, in some embodiments, the desulfurization system includes a flue gas desulfurization absorption tower 3;

[0090] The heat compensation system includes: a desulfurization slurry flash tank 7, an absorption heat pump 8 and a heat exchanger 9, wherein the desulfurization slurry flash tank 7 is connected to the bottom of the flue gas desulfurization absorption tower 3, and is used to evaporate the desulfurization slurry flowing out of the bottom of the flue gas desulfurization absorption tower into gaseous desulfurization slurry, and the gaseous desulfurization slurry flows out of the desulfurization slurry flash tank and enters the absorption heat pump; the absorption heat pump is used to heat the inflowing gaseous desulfurization slurry, and then enters the heat exchanger for heat exchange to heat the desorption liquid, and after heat exchange, refluxes to the bottom of the flue gas desulfurization absorption tower;

[0091] The heating power of the thermal compensation system is regulated by the power of the absorption heat pump;

[0092] The carbon capture system includes: a carbon capture absorption tower 4, a carbon capture regeneration tower 5 and a reboiler 11;

[0093] The carbon capture absorption tower contains a desorbed solution, which is used to adsorb carbon oxides in the desulfurized flue gas after the flue gas is passed into the flue gas desulfurization absorption tower, and is discharged from the bottom to enter the reboiler;

[0094] The reboiler is connected to the bottom of the carbon capture absorption tower, the bottom of the carbon capture regeneration tower, and the heat exchanger respectively; the desorption liquid adsorbed with carbon oxides enters the reboiler for heating, flows into the heat exchanger for further heating, and then enters the top of the carbon capture regeneration tower;

[0095] The carbon capture regeneration tower is used to reduce the analytical solution adsorbed with carbon oxides to the analytical solution. The reduced analytical solution flows into the reboiler and then flows into the top of the carbon capture absorption tower through the reboiler.

[0096] The thermal compensation system can heat the analytical solution between the carbon capture absorption tower and the carbon capture regeneration tower to ensure the carbon capture efficiency of the carbon capture absorption tower.

[0097] Figure 2 A flue gas purification system for a coal-fired power plant is proposed. The system includes a flue gas purification subsystem for a coal-fired power plant, a flue gas carbon capture system, and an intelligent linkage control system.

[0098] The flue gas purification subsystem of a coal-fired power plant includes: an SCR reactor 1, a bag filter 2 (for dust removal), a flue gas desulfurization absorption tower 3, an induced draft fan 6, a desulfurization slurry flash tank 7, an absorption heat pump 8, a heat exchanger 9, an ammonia injector 12, a slurry circulation pump 13, a heat exchanger hot side flow valve 14, a flash tank steam outlet regulating valve 15, and a main steam inlet heat pump flow valve 16.

[0099] The flue gas carbon capture subsystem includes: a carbon capture absorption tower 4, a carbon capture regeneration tower 5, a cooler 10, and a reboiler 11.

[0100] The intelligent linkage control subsystem includes: a multi-scale data fusion center, an adaptive control module, and a dynamic adjustment execution unit.

[0101] The intelligent control system receives the unit load signal and flue gas online monitoring data in real time, and outputs control instructions to each unit based on the dynamic optimization algorithm of load forecast. The various parameters after intelligent adjustment are returned to the multi-scale data fusion center for further optimization. Specifically:

[0102] When the unit load becomes lower, the power of the induced draft fan 6 is reduced, the opening of the denitrification ammonia injection valve 12 and the opening of the desulfurization slurry pump 13 are reduced; when the unit load is higher than 70% and the carbon capture efficiency is less than 90%, the thermal compensation system is automatically started, the inverter controls the increase of the compressor speed of the absorption heat pump 8, and the inverter controls the increase of the opening of the hot side flow valve of the heat exchanger 15.

[0103] Furthermore, when the unit load becomes higher, the power of the induced draft fan 6 is increased, the opening of the denitrification ammonia injection valve 12 and the opening of the desulfurization slurry pump 13 are increased, the inverter controls to reduce the speed of the absorption heat pump 8 compressor, and the inverter controls to reduce the opening of the heat exchanger hot side flow valve 14.

[0104] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the order of the actions described, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0105] The above is an introduction to the method embodiment. The following is a further explanation of the solution disclosed in the present disclosure through an apparatus embodiment.

[0106] Figure 3 FIG. 3 shows a block diagram of a flue gas purification system 300 for a coal-fired power plant according to an embodiment of the present disclosure. Figure 3 As shown, the system 300 includes:

[0107] A denitration system, a desulfurization system, a carbon capture system, and a linkage control system, wherein the denitration system is connected to the desulfurization system, the desulfurization system is connected to the carbon capture system, and the linkage control system is connected to the denitration system, the desulfurization system, and the carbon capture system, and the linkage control system includes:

[0108] A first acquisition module 310 is configured to acquire the current load of the coal-fired power plant;

[0109] A first control module 320 is configured to control the amount of ammonia injected into the denitration system according to the current load;

[0110] A second control module 330 is configured to control the desulfurization slurry of the desulfurization system according to the current load;

[0111] The second acquisition module 340 is used to obtain the current carbon capture efficiency;

[0112] The third control module 350 is configured to control the carbon capture system according to the current load and / or the current carbon capture efficiency.

[0113] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the described module can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0114] According to an embodiment of the present disclosure, the present disclosure also provides an electronic device and a non-transitory computer-readable storage medium storing computer instructions.

[0115] Figure 4A schematic block diagram of an electronic device 800 that can be used to implement an embodiment of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0116] The device 800 includes a computing unit 801 that can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 802 or a computer program loaded from a storage unit 808 into a random access memory (RAM) 803. Various programs and data required for the operation of the device 800 may also be stored in the RAM 803. The computing unit 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0117] Various components in device 800 are connected to I / O interface 805, including an input unit 806, such as a keyboard, mouse, etc.; an output unit 807, such as various types of displays, speakers, etc.; a storage unit 808, such as a magnetic disk, optical disk, etc.; and a communication unit 809, such as a network card, modem, wireless communication transceiver, etc. The communication unit 809 allows device 800 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0118] The computing unit 801 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various computing units that run machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 801 performs the various methods and processes described above, such as method 100. For example, in some embodiments, method 100 can be implemented as a computer software program tangibly embodied in a machine-readable medium, such as a storage unit 808. In some embodiments, part or all of the computer program can be loaded and / or installed onto the device 800 via the ROM 802 and / or the communication unit 809. When the computer program is loaded into the RAM 803 and executed by the computing unit 801, one or more steps of the method 100 described above can be performed. Alternatively, in other embodiments, the computing unit 801 can be configured to perform the method 100 in any other suitable manner, such as by means of firmware.

[0119] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special-purpose or general-purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0120] The program code for implementing the method of the present disclosure can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device so that when the program code is executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The program code can be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0121] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory RAM, a read-only memory ROM, an erasable programmable read-only memory EPROM or flash memory, an optical fiber, a portable compact disk read-only memory CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0122] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device, such as a CRT cathode ray tube or an LCD liquid crystal display monitor, for displaying information to the user; and a keyboard and pointing device, such as a mouse or a trackball, through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback, such as visual feedback, auditory feedback, or tactile feedback; and input from the user can be received in any form, including acoustic input, voice input, or tactile input.

[0123] The systems and techniques described herein can be implemented in a computing system that includes back-end components, such as a data server, or a computing system that includes middleware components, such as an application server, or a computing system that includes front-end components, such as a user computer with a graphical user interface or a web browser through which a user can interact with an embodiment of the systems and techniques described herein, or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication, such as a communication network. Examples of communication networks include: a local area network (LAN), a wide area network (WAN), and the Internet.

[0124] A computing system may include clients and servers. The client and server are generally remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers and forming a client-server relationship with each other. The server may be a cloud server, a server in a distributed system, or a server integrated with a blockchain.

[0125] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved. This is not a limitation herein.

[0126] The above specific embodiments do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure shall be included within the scope of protection of this disclosure.

Claims

1. A flue gas purification method for a coal-fired power plant, characterized in that: The method is applicable to a flue gas purification system of a coal-fired power plant, wherein the flue gas purification system of the coal-fired power plant includes a denitrification system, a desulfurization system, and a carbon capture system, wherein the denitrification system is connected to the desulfurization system, and the desulfurization system is connected to the carbon capture system. The method comprises: Obtaining the current load of the coal-fired power plant; controlling the ammonia injection amount of the denitration system according to the current load; controlling the desulfurization slurry of the desulfurization system according to the current load; Obtain current carbon capture efficiency; The carbon capture system is controlled according to the current load and / or the current carbon capture efficiency.

2. The method according to claim 1, wherein The controlling of the ammonia injection amount of the denitration system according to the current load includes: Determining whether the current load becomes lower or higher; If the current load becomes lower, the opening of the denitration ammonia injection valve of the denitration system is reduced to reduce the amount of ammonia injection; If the current load becomes higher, the opening of the denitration ammonia injection valve of the denitration system is increased to increase the ammonia injection amount.

3. The method according to claim 1, wherein The controlling of the desulfurization slurry of the desulfurization system according to the current load includes: Determining whether the current load becomes lower or higher; If the current load becomes lower, the desulfurization slurry pump power of the desulfurization system is reduced to reduce the desulfurization slurry; If the current load becomes higher, the desulfurization slurry pump power of the desulfurization system is increased to increase the desulfurization slurry.

4. The method according to claim 1, wherein An induced draft fan is connected between the desulfurization system and the carbon capture system; The induced draft fan is used to introduce the flue gas desulfurized by the desulfurization system into the carbon capture system; the method further includes: If the current load becomes lower, reducing the power of the induced draft fan; If the current load becomes higher, the power of the induced draft fan is increased.

5. The method according to claim 1, wherein A heat compensation system is connected between the desulfurization system and the carbon capture system, and the heat compensation system is used to heat the carbon oxide adsorbed desorption liquid flowing out of the carbon capture system using the heat of the outflowing heat exchange medium; The controlling the carbon capture system according to the current load and / or the current carbon capture efficiency includes: If the current load becomes higher, the heating power and heat exchange medium flow of the heat compensation system are reduced to reduce the amount of heat applied to the analytical solution.

6. The method according to claim 1, wherein A heat compensation system is connected between the desulfurization system and the carbon capture system, and the heat compensation system is used to heat the desorption liquid adsorbed with carbon oxides flowing out of the carbon capture system; The controlling the carbon capture system according to the current load and / or the current carbon capture efficiency includes: If the current load is higher than the preset load and the current carbon capture efficiency is lower than the preset carbon capture efficiency, the heating power and the flow rate of the heat exchange medium of the heat compensation system are increased to increase the heat of the desorption liquid.

7. The method according to claim 5 or 6, wherein: The desulfurization system includes a flue gas desulfurization absorption tower; The heat compensation system includes: a desulfurization slurry flash tank, an absorption heat pump and a heat exchanger, wherein the desulfurization slurry flash tank is connected to the bottom of the flue gas desulfurization absorption tower, and is used to evaporate the desulfurization slurry flowing out of the bottom of the flue gas desulfurization absorption tower into gaseous desulfurization slurry, and the gaseous desulfurization slurry flows out of the desulfurization slurry flash tank and enters the absorption heat pump; the absorption heat pump is used to heat the inflowing gaseous desulfurization slurry, and then enters the heat exchanger for heat exchange to heat the desorption liquid, and after heat exchange, refluxes to the bottom of the flue gas desulfurization absorption tower; The heating power of the thermal compensation system is regulated by the power of the absorption heat pump; The carbon capture system includes: a carbon capture absorption tower, a carbon capture regeneration tower and a reboiler; The carbon capture absorption tower contains a desorbed solution, which is used to adsorb carbon oxides in the desulfurized flue gas after the flue gas is passed into the flue gas desulfurization absorption tower, and is discharged from the bottom to enter the reboiler; The reboiler is connected to the bottom of the carbon capture absorption tower, the bottom of the carbon capture regeneration tower, and the heat exchanger respectively; the desorption liquid adsorbed with carbon oxides enters the reboiler for heating, flows into the heat exchanger for further heating, and then enters the top of the carbon capture regeneration tower; The carbon capture regeneration tower is used to reduce the analytical solution adsorbed with carbon oxides to the analytical solution. The reduced analytical solution flows into the reboiler and then flows into the top of the carbon capture absorption tower through the reboiler.

8. A flue gas purification system for a coal-fired power plant, characterized in that: The flue gas purification system of the coal-fired power plant includes a denitration system, a desulfurization system, a carbon capture system, and a linkage control system. The denitration system is connected to the desulfurization system, the desulfurization system is connected to the carbon capture system, and the linkage control system is connected to the denitration system, the desulfurization system, and the carbon capture system. The linkage control system includes: A first acquisition module is used to obtain the current load of the coal-fired power plant; A first control module is used to control the ammonia injection amount of the denitration system according to the current load; a second control module, configured to control the desulfurization slurry of the desulfurization system according to the current load; The second acquisition module is used to obtain the current carbon capture efficiency; A third control module is configured to control the carbon capture system according to the current load and / or the current carbon capture efficiency.

9. An electronic device, characterized in that: include: memory and processor, The memory stores a computer program, and when the processor executes the program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that When the instructions in the storage medium are executed by a processor corresponding to the electronic device, the electronic device is enabled to implement the flue gas purification method for a coal-fired power plant as described in any one of claims 1 to 7.

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