Stable operation system and method using circulating water cold source under deep peak regulation working condition

Abstract

The invention discloses a system and method for stable operation through a circulating water cold source under the deep peak regulation working condition, and relates to the technical field of thermal power generation. The method comprises the steps that under the deep peak regulation working condition of a power station, the target temperature needing to be increased of flue gas in a power station boiler is determined; according to the target temperature, needing to be increased, of the flue gas in the power station boiler, the total heat needing to be output by a heat supply unit is calculated; respectively calculating the output heat of the first heat source and the output heat of the second heat source according to the total heat and the efficiency rate of the heat supply unit; and based on the output heat of the first heat source and the output heat of the second heat source, flow control is conducted on the first heat source and the second heat source, so that the temperature of air entering the power station boiler is increased. Under the working condition of deep peak regulation of the power station, stable combustion of the boiler and stable operation of the denitration system can be guaranteed.

Description

Technical Field

[0001] The present application relates to the field of thermal power generation technology, and in particular to a system and method for stable operation using a circulating water cooling source under deep peak regulation conditions. Background Art

[0002] With the continuous increase in the total installed capacity of new energy, the peak-shaving time of thermal power generating units is getting longer and longer, and the peak-shaving depth is getting deeper. Under such an operating environment, how to ensure stable combustion of boilers and stable operation of denitrification systems is a technical problem that needs to be solved urgently. Summary of the invention

[0003] In view of this, the present application provides a system and method for stable operation of a circulating water cooling source under deep peak-shaving conditions. The main purpose is to ensure stable combustion of the boiler and stable operation of the denitrification system under deep peak-shaving conditions in the power station.

[0004] According to the first aspect of the present application, a method for stable operation using a circulating water cooling source under deep peak load conditions is provided, the method comprising:

[0005] Under the deep peak load regulation condition of the power station, determine the target temperature of the flue gas in the power station boiler that needs to be raised;

[0006] Calculate the total heat output of the heating unit according to the target temperature of the flue gas in the power station boiler;

[0007] Calculating the output heat of the first heat source and the output heat of the second heat source respectively according to the total heat and the efficiency rate of the heating unit;

[0008] Based on the output heat of the first heat source and the output heat of the second heat source, the flow rates of the first heat source and the second heat source are controlled respectively to increase the temperature of air entering the power station boiler.

[0009] According to the second aspect of the present application, a device for stable operation using a circulating water cooling source under deep peak load conditions is provided, the device comprising:

[0010] A determination unit is used to determine the target temperature that needs to be raised for the flue gas in the power plant boiler under the deep peak regulation condition of the power plant;

[0011] A first calculation unit is used to calculate the total heat that needs to be output by the heating unit according to the target temperature that needs to be raised for the flue gas in the power station boiler;

[0012] A second calculation unit is used to calculate the output heat of the first heat source and the output heat of the second heat source according to the total heat and the efficiency of the heating unit;

[0013] A control unit is used to control the flow of the first heat source and the second heat source respectively based on the output heat of the first heat source and the output heat of the second heat source, so as to increase the temperature of air entering the power station boiler.

[0014] According to a third aspect of the present application, a storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the stable operation method using a circulating water cooling source under the above-mentioned deep peak-shaving condition is implemented.

[0015] According to the fourth aspect of the present application, an electronic device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein when the processor executes the program, the stable operation method using a circulating water cooling source under the above-mentioned deep peak regulation condition is implemented.

[0016] According to the fifth aspect of the present application, a system for stably operating under deep peak-shaving conditions using a circulating water cooling source is provided, the system comprising: a first heat source, a second heat source, a heating unit, an air heating unit, a power station boiler and a denitrification system, the output end of the first heat source and the output end of the second heat source are respectively connected to the input end of the heating unit, the output end of the heating unit is connected to the input end of the air heating unit, the output end of the air heating unit is connected to the input end of the power station boiler 1, and the output end of the power station boiler 1 is connected to the denitrification system; under the deep peak-shaving conditions of the power station, the heating unit utilizes the heat of the first heat source and the heat of the second heat source to heat the air in the air heating unit, so that the heated air flows into the power station boiler and burns with coal powder to form flue gas that enters the denitrification system for flue gas denitrification.

[0017] By means of the above technical scheme, the present application provides a system and method for stable operation using a circulating water cooling source under deep peak-shaving conditions. Under deep peak-shaving conditions of a power station, the total heat that needs to be output by the heating unit is calculated according to the target temperature that needs to be raised for the flue gas in the power station boiler, and then the output heat of the first heat source and the output heat of the second heat source are calculated respectively according to the total heat and the efficiency of the heating unit. Finally, based on the output heat of the first heat source and the output heat of the second heat source, the flow of the first heat source and the second heat source are controlled respectively to increase the temperature of the air entering the power station boiler. Since the present application uses the first heat source and the second heat source to heat the air entering the power station boiler under deep peak-shaving conditions of the power station, it can ensure the stable combustion of the power station boiler under deep peak-shaving operating conditions, and at the same time, it can also increase the inlet flue gas temperature of the denitrification system, thereby ensuring the activity of the catalyst in the denitrification system under deep peak-shaving operating conditions, broadening the working range of the denitrification system under deep peak-shaving operating conditions of the power station boiler, and thus ensuring the stable operation of the denitrification system.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A schematic diagram of a process for a stable operation method using a circulating water cooling source under a deep peak load condition provided by an embodiment of the present application is shown;

[0021] Figure 2 A schematic diagram of the structure of a system for stably operating a circulating water cooling source under deep peak load conditions provided by an embodiment of the present application is shown;

[0022] Figure 3 A schematic diagram of the structure of another system for stably operating a circulating water cooling source under deep peak load conditions provided by an embodiment of the present application is shown;

[0023] Figure 4 A schematic diagram of the structure of a device for stable operation using a circulating water cooling source under deep peak load conditions provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0025] Under the deep peak-shaving conditions of the power station, how to ensure stable combustion of the boiler and stable operation of the denitrification system is a technical problem that needs to be solved urgently.

[0026] In order to solve the above problems, the embodiment of the present invention provides a method for stable operation using a circulating water cooling source under deep peak load conditions, such as Figure 1 As shown, the method includes:

[0027] Step 101: Under the deep peak load regulation condition of the power station, determine the target temperature of the flue gas in the power station boiler that needs to be increased.

[0028] For the embodiment of the present invention, when determining the target temperature that needs to be raised for the flue gas in the power plant boiler, the real-time temperature of the flue gas in the power plant boiler under the deep peak-shaving condition of the power plant is first obtained, and then the target temperature that needs to be raised for the flue gas is determined based on the real-time temperature of the flue gas.

[0029] Specifically, the real-time temperature of the flue gas in the power plant boiler can be collected by the temperature sensor in real time. After obtaining the real-time temperature, the control unit determines the target temperature of the flue gas in the power plant boiler that needs to be raised according to the real-time temperature, such as determining that the flue gas in the power plant boiler needs to be raised by 50 degrees.

[0030] Step 102: Calculate the total heat output of the heating unit according to the target temperature of the flue gas in the power station boiler.

[0031] For the embodiment of the present invention, after determining the target temperature to which the flue gas needs to be raised, it is necessary to calculate the total heat output by the heating unit based on the target temperature. For this process, the method includes: obtaining the flow rate of the flue gas in the power station boiler under the deep peak-shaving condition of the power station; calculating the total heat output by the heating unit based on the flow rate of the flue gas and the target temperature to which the flue gas needs to be raised.

[0032] Q=m×Cp×ΔT

[0033] Among them, Q represents the total heat required, m represents the flow rate of flue gas, which can be measured by sensors, Cp represents the constant pressure specific heat capacity of flue gas, which can be measured experimentally, and ΔT represents the temperature that needs to be raised. According to the above formula, the total heat output of the heating unit can be calculated.

[0034] Step 103: Calculate the output heat of the first heat source and the output heat of the second heat source respectively according to the total heat and the efficiency of the heating unit.

[0035] The efficiency of the heating unit specifically refers to the COP (Coefficient of Performance) of the heating unit. The first heat source specifically refers to the intermediate pressure cylinder of the steam turbine, and the second heat source specifically refers to the cooling water tower.

[0036] For the embodiment of the present invention, when determining the output heat of the first heat source and the second heat source, step 103 specifically includes: calculating the output heat of the first heat source based on the total heat and the efficiency of the heating unit; subtracting the total heat from the output heat of the first heat source to obtain the output heat of the second heat source.

[0037] For example, the efficiency rate of the heating unit is 1:1.7, the total heat is 30 MW, the heat required by the turbine intermediate pressure cylinder is 30÷1.7=17.6 MW, and the heat required by the cooling water tower is 30-17.6=12.4 MW.

[0038] Step 104: Based on the output heat of the first heat source and the output heat of the second heat source, flow control is performed on the first heat source and the second heat source respectively to increase the temperature of air entering the power station boiler.

[0039] For the embodiment of the present invention, when the flow rate of the first heat source and the second heat source is controlled, the inlet and outlet temperature difference of the first heat source and the inlet and outlet temperature difference of the second heat source are respectively determined, and then the control flow rate of the first heat source is calculated based on the inlet and outlet temperature difference of the first heat source and the output heat of the first heat source. At the same time, the control flow rate of the second heat source is calculated based on the inlet and outlet temperature difference of the second heat source and the output heat of the second heat source. Finally, based on the control flow rate of the first heat source and the control flow rate of the second heat source, the first heat source and the second heat source are respectively controlled.

[0040] Specifically, the inlet and exhaust temperature difference of the steam turbine intermediate pressure cylinder is calculated based on the real-time collected steam inlet and exhaust temperature of the steam turbine intermediate pressure cylinder, and the inlet and outlet temperature difference of the circulating water in the cooling water tower is calculated based on the inlet and outlet temperature of the circulating water in the cooling water tower. Then, the control flow of the steam turbine intermediate pressure cylinder is calculated based on the inlet and exhaust temperature difference of the steam turbine intermediate pressure cylinder and the heat required to be provided. Similarly, the control flow of the cooling water tower is calculated based on the inlet and outlet temperature difference of the circulating water in the cooling water tower and the heat required to be provided.

[0041] An embodiment of the present invention provides a stable operation method using a circulating water cooling source under deep peak-shaving conditions. Under the deep peak-shaving conditions of a power station, by controlling the flow rates of a first heat source and a second heat source, the air entering the power station boiler is heated, thereby ensuring stable combustion of the power station boiler under the deep peak-shaving operating conditions. At the same time, the inlet flue gas temperature of the denitrification system can be increased, thereby ensuring the activity of the catalyst in the denitrification system under the deep peak-shaving operating conditions, broadening the working range of the denitrification system under the deep peak-shaving operating conditions of the power station boiler, and further ensuring stable operation of the denitrification system.

[0042] Furthermore, the embodiment of the present invention provides a system for stably operating a circulating water cooling source under deep peak load conditions, such as Figure 2 As shown, the method includes: a first heat source 4, a second heat source 6, a heating unit 2, an air heating unit 5, a power station boiler 1 and a denitration system 3, wherein the output end of the first heat source 4 and the output end of the second heat source 6 are respectively connected to the input end of the heating unit 2, the output end of the heating unit 2 is connected to the input end of the air heating unit 5, the output end of the air heating unit 5 is connected to the input end of the power station boiler 1, and the output end of the power station boiler 1 is connected to the denitration system 3; under the deep peak regulation condition of the power station, the heating unit 2 uses the heat of the first heat source 4 and the heat of the second heat source 6 to heat the air in the air heating unit 5, so that the heated air flows into the power station boiler 1 and burns with coal powder to form flue gas, which enters the denitration system 3 for flue gas denitration.

[0043] In some embodiments, Figure 3As shown, the first heat source 4 includes a steam turbine intermediate pressure cylinder 41, and the second heat source 6 includes a cooling water tower 61. The exhaust end of the steam turbine intermediate pressure cylinder 41 and the circulating water outflow end of the cooling water tower 61 are respectively connected to the heat supply unit 2.

[0044] In some embodiments, the heating unit includes 2: a heat pump unit 21, the input end of the heat pump unit 21 is respectively connected to the output end of the first heat source 4 and the output end of the second heat source 6, and the output end of the heat pump unit 21 is connected to the input end of the air heating unit 5.

[0045] Specifically, the input end of the heat pump unit 21 is connected to the output end of the steam turbine intermediate pressure cylinder 41 and the output end of the cooling water tower 61 respectively, and the output end of the heat pump unit 21 is connected to the input end of the air heating unit 5 .

[0046] In some embodiments, the air heating unit 5 includes: a boiler air heater 51 , the input end of the boiler air heater 51 is connected to the output end of the heating unit 2 , and the output end of the boiler air heater 51 is connected to the input end of the power station boiler 1 .

[0047] Specifically, the input end of the boiler air heater 51 is connected to the output end of the heat pump unit 21 , and the output end of the boiler air heater 51 is connected to the input end of the power station boiler 1 .

[0048] In some embodiments, the denitration system 3 includes: a selective catalytic reduction reactor 31 , and an input end of the selective catalytic reduction reactor 31 is connected to an output end of the power station boiler 1 .

[0049] The selective catalytic reduction reactor 31 is an SCR reactor.

[0050] Specifically, under the deep peak-shaving condition of the power plant, the heat pump unit 21 uses the exhaust steam of the turbine intermediate-pressure cylinder 41 as the high-temperature heat source and the circulating water of the cooling water tower 61 as the low-temperature heat source to supply medium-temperature heat to heat the air in the boiler heater 51. The heated air is burned with the pulverized coal in the power plant boiler 1 to form flue gas, which passes through the economizer outlet of the power plant boiler 1 and then enters the SCR reactor 31 for flue gas denitrification.

[0051] Taking a 300MW subcritical generating unit as an example, under the original deep peak-shaving operating conditions, the heat pump unit can utilize about 12MW of circulating water waste heat to increase the inlet air temperature of the power station boiler by about 50°C, thereby ensuring stable combustion of the power station boiler and the activity of the SCR catalyst under deep peak-shaving operating conditions.

[0052] An embodiment of the present invention provides a system for stably operating a circulating water cooling source under deep peak-shaving conditions. Under the deep peak-shaving conditions of a power station, the air entering the power station boiler is heated by utilizing a first heat source and a second heat source, and the heated air is combusted with pulverized coal to form flue gas that enters a denitrification system for flue gas denitrification. This ensures that the power station boiler burns stably under deep peak-shaving operating conditions and simultaneously increases the inlet flue gas temperature of the denitrification system, thereby ensuring the activity of the catalyst in the denitrification system under deep peak-shaving operating conditions, broadening the working range of the denitrification system under deep peak-shaving operating conditions of the power station boiler, and thereby ensuring stable operation of the denitrification system.

[0053] Further, as Figure 1 The specific implementation of the method shown in the embodiment provides a device for stable operation using a circulating water cooling source under deep peak load conditions, such as Figure 4 As shown, the device includes: a determination unit 31, a first calculation unit 32, a second calculation unit 33 and a control unit 34.

[0054] The determination unit 31 may be used to determine the target temperature of the flue gas in the power plant boiler that needs to be increased under the deep peak load regulation condition of the power plant.

[0055] The first calculation unit 32 may be used to calculate the total amount of heat that needs to be output by the heating unit according to the target temperature that needs to be raised for the flue gas in the power station boiler.

[0056] The second calculation unit 33 can be used to calculate the output heat of the first heat source and the output heat of the second heat source according to the total heat and the efficiency of the heating unit.

[0057] The control unit 34 may be configured to control the flow rates of the first heat source and the second heat source, respectively, based on the output heat of the first heat source and the output heat of the second heat source, so as to increase the temperature of air entering the power station boiler.

[0058] In some embodiments, the determination unit 31 can be specifically used to obtain the real-time temperature of the flue gas in the power plant boiler under the deep peak-shaving condition of the power plant; and determine the target temperature of the flue gas that needs to be increased according to the real-time temperature of the flue gas.

[0059] In some embodiments, the first calculation unit 32 can be specifically used to obtain the flow rate of flue gas in the power plant boiler under the deep peak-shaving condition of the power plant; and calculate the total heat that the heating unit needs to output based on the flow rate of the flue gas and the target temperature that the flue gas needs to be raised.

[0060] In some embodiments, the second calculation unit 33 can be specifically used to calculate the output heat of the first heat source according to the total heat and the efficiency of the heating unit; and subtract the total heat from the output heat of the first heat source to obtain the output heat of the second heat source.

[0061] In some embodiments, the control unit 34 can be specifically used to respectively determine the inlet and outlet temperature difference of the first heat source and the inlet and outlet temperature difference of the second heat source; calculate the control flow of the first heat source based on the inlet and outlet temperature difference of the first heat source and the output heat of the first heat source; calculate the control flow of the second heat source based on the inlet and outlet temperature difference of the second heat source and the output heat of the second heat source; and control the first heat source and the second heat source respectively based on the control flow of the first heat source and the control flow of the second heat source.

[0062] It should be noted that for other corresponding descriptions of the functional units involved in the device for stable operation of a circulating water cooling source under deep peak load conditions provided by an embodiment of the present invention, reference can be made to Figure 1 The corresponding description in will not be repeated here.

[0063] Based on the above Figure 1 The method shown in the embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned Figure 1 The method of stable operation using a circulating water cooling source under deep peak regulation conditions is shown.

[0064] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling an electronic device (which can be a personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of the present application.

[0065] Based on the above Figure 1 The method shown, and Figure 4 In order to achieve the above-mentioned purpose, the embodiment of the present application also provides an electronic device, which can be a personal computer, a tablet computer, a server, or other network equipment, etc. The device includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Figure 1 The method of stable operation using a circulating water cooling source under deep peak regulation conditions is shown.

[0066] Optionally, the above-mentioned physical device may also include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), etc.

[0067] Those skilled in the art will appreciate that the above-mentioned physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or a combination of certain components, or different arrangements of components.

[0068] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the above-mentioned physical device, and supports the operation of the information processing program and other software and / or programs. The network communication module is used to realize the communication between the components inside the storage medium, and the communication with other hardware and software in the information processing physical device.

[0069] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform, or by hardware.

[0070] The embodiment of the present invention controls the flow rates of the first heat source and the second heat source to heat the air entering the power station boiler under the deep peak-shaving operating conditions of the power station, thereby ensuring the stable combustion of the power station boiler under the deep peak-shaving operating conditions. At the same time, it can also increase the inlet flue gas temperature of the denitrification system, thereby ensuring the activity of the catalyst in the denitrification system under the deep peak-shaving operating conditions, broadening the working range of the denitrification system under the deep peak-shaving operating conditions of the power station boiler, and further ensuring the stable operation of the denitrification system.

[0071] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0072] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A method for stable operation using a circulating water cooling source under deep peak load conditions, characterized in that: include: Under the deep peak load regulation condition of the power station, determine the target temperature of the flue gas in the power station boiler that needs to be raised; Calculate the total heat output of the heating unit according to the target temperature of the flue gas in the power station boiler; Calculating the output heat of the first heat source and the output heat of the second heat source respectively according to the total heat and the efficiency rate of the heating unit; Based on the output heat of the first heat source and the output heat of the second heat source, the flow rates of the first heat source and the second heat source are controlled respectively to increase the temperature of air entering the power station boiler.

2. The method according to claim 1, characterized in that: The step of determining the target temperature of flue gas in the power plant boiler that needs to be raised under the deep peak load regulation condition of the power plant includes: Obtaining the real-time temperature of the flue gas in the power plant boiler under the deep peak load condition of the power plant; Determining a target temperature of the flue gas that needs to be raised according to the real-time temperature of the flue gas; and / or The total heat that needs to be output by the heating unit is calculated according to the target temperature that needs to be raised for the flue gas in the power station boiler, including: Obtaining the flow rate of flue gas in the power plant boiler under the deep peak load condition of the power plant; Calculating the total amount of heat that the heating unit needs to output according to the flow rate of the flue gas and the target temperature that the flue gas needs to be raised; and / or The step of calculating the output heat of the first heat source and the output heat of the second heat source respectively according to the total heat and the efficiency of the heating unit comprises: Calculating the output heat of the first heat source according to the total heat and the efficiency rate of the heating unit; The total heat is subtracted from the output heat of the first heat source to obtain the output heat of the second heat source.

3. The method according to claim 1, characterized in that The flow control of the first heat source and the second heat source respectively based on the output heat of the first heat source and the output heat of the second heat source includes: respectively determining an inlet and outlet temperature difference of the first heat source and an inlet and outlet temperature difference of the second heat source; Calculating a control flow rate of the first heat source based on an inlet and outlet temperature difference of the first heat source and an output heat amount of the first heat source; Calculating a control flow rate of the second heat source based on an inlet and outlet temperature difference of the second heat source and an output heat amount of the second heat source; Based on the controlled flow rate of the first heat source and the controlled flow rate of the second heat source, the first heat source and the second heat source are controlled respectively.

4. A device for stable operation using a circulating water cooling source under deep peak load conditions, characterized in that: include: A determination unit is used to determine the target temperature that needs to be raised for the flue gas in the power plant boiler under the deep peak regulation condition of the power plant; A first calculation unit is used to calculate the total heat that needs to be output by the heating unit according to the target temperature that needs to be raised for the flue gas in the power station boiler; A second calculation unit is used to calculate the output heat of the first heat source and the output heat of the second heat source according to the total heat and the efficiency of the heating unit; A control unit is used to control the flow of the first heat source and the second heat source respectively based on the output heat of the first heat source and the output heat of the second heat source, so as to increase the temperature of air entering the power station boiler.

5. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

6. An electronic device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 3 is implemented.

7. A system for stable operation using a circulating water cooling source under deep peak load conditions, characterized in that: The method according to any one of claims 1 to 3 comprises: a first heat source, a second heat source, a heating unit, an air heating unit, a power station boiler and a denitration system, wherein the output end of the first heat source and the output end of the second heat source are respectively connected to the input end of the heating unit, the output end of the heating unit is connected to the input end of the air heating unit, the output end of the air heating unit is connected to the input end of the power station boiler, and the output end of the power station boiler is connected to the denitration system; Under the deep peak-shaving condition of the power plant, the heating unit uses the heat of the first heat source and the heat of the second heat source to heat the air in the air heating unit, so that the heated air flows into the power plant boiler and burns with coal powder to form flue gas that enters the denitrification system for flue gas denitrification.

8. The system according to claim 7, characterized in that The first heat source includes an intermediate pressure cylinder of a steam turbine, and the second heat source includes a cooling water tower. The exhaust end of the intermediate pressure cylinder of the steam turbine and the circulating water outflow end of the cooling water tower are respectively connected to the heat supply unit.

9. The system according to claim 7, characterized in that The heating unit comprises: a heat pump unit, the input end of the heat pump unit is respectively connected to the output end of the first heat source and the output end of the second heat source, and the output end of the heat pump unit is connected to the input end of the air heating unit.

10. The system according to claim 7, characterized in that The air heating unit comprises: a boiler air heater, the input end of the boiler air heater is connected to the output end of the heating unit, and the output end of the boiler air heater is connected to the input end of the power station boiler; and / or The denitration system comprises: a selective catalytic reduction reactor, wherein the input end of the selective catalytic reduction reactor is connected to the output end of the power station boiler.

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