Thermal control optimization method and system for thermal power generating unit

Abstract

The invention relates to a thermal control optimization method and system of a thermal power generating unit, and belongs to the technical field of thermal control optimization of the thermal power generating unit, and the system comprises a unit dry-wet state thermal control system end, and a water storage monitoring end, a dry-wet state conversion control end and a water supply loop end which are in signal connection with the unit dry-wet state thermal control system end. The core of the method is that the liquid level and temperature of a water storage tank are monitored in real time through a water storage monitoring end, and a dry-wet state conversion control end judges dry-wet state conversion conditions according to unit loads and monitoring data; when the conditions are met, the unit dry and wet state thermal control system end coordinates the water supply loop end to execute automatic switching between the main water supply pipeline and the bypass water supply pipeline, and the coal amount is synchronously adjusted; in the switching process, the water supply flow is kept stable through real-time adjustment of a flow detection and feedback mechanism. Automation and intelligentization of the dry and wet state conversion process are achieved, the technical problems that in the conversion process, the steam temperature is prone to fluctuation, and feed water flow control lags behind are effectively solved, and the stability and efficiency of unit operation are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal control optimization of thermal power generating units, and more particularly to a thermal control optimization method and system for thermal power generating units. BACKGROUND

[0002] Thermal power generating units are units that use coal, oil or combustible gas as fuel to heat water in a boiler, increase the temperature of the water, and then use steam with a certain pressure to drive a turbine to generate electricity, and a thermal control system in a thermal power generating unit is an important component of an automatic or automatic control system of a thermal power plant, the function of the thermal control system is to control parameters of various thermal processes, and a regulating system in the field of thermal control mainly includes a boiler load regulating system, a fuel quantity regulating system, a feedwater regulating system, a unit dry-wet state regulating system and the like.

[0003] At present, a once-through boiler is a kind of boiler used in thermal power generating units, and in a dry state operation stage of the once-through boiler, a working medium passes through a heating surface only once, and a start-up separator is only used as a steam passage, the control points in this stage are to control a coal-water ratio and to focus on controlling an intermediate point temperature, the intermediate point temperature reflects a direct balance between input heat of the boiler and a boiler load (output heat of the boiler), in a wet state operation stage of the once-through boiler, when wet saturated steam passes through the separator, water is left in a water storage tank of the separator, and the steam passes through the separator to enter a next heating surface, the control points in this stage are to control a water level of the water storage tank of the separator, but are closer to the once-through boiler, and because the once-through boiler has poor heat storage capacity, the steam temperature is very easy to fluctuate in the wet state process, and fluctuations in the feedwater flow have a serious impact on the steam temperature as in the dry state operation stage, and the current dry-wet state conversion thermal operation is relatively unstable, therefore, optimization of the dry-wet state conversion operation in the thermal control system of the thermal power generating unit is crucial in a unit operation process, and for this purpose, the present application provides a thermal control optimization system and method for thermal power generating units to solve the problem. SUMMARY

[0004] To solve the above technical problem, the present application provides a thermal control optimization method and system for thermal power generating units.

[0005] The technical scheme of the present application is as follows: The present application provides a thermal control optimization system for thermal power generating units, which comprises a unit dry-wet state thermal control system end, a feedwater circuit end, a dry-wet state conversion control end and a water storage monitoring end, and wherein: The unit dry-wet state thermal control system end is used to receive and process real-time data from the feedwater circuit end, the dry-wet state conversion control end and the water storage monitoring end, and coordinate the whole process of dry-wet state conversion; The water storage monitoring end is signal connected with the unit dry-wet state thermal control system end, and is used to monitor a liquid level and a temperature of a water storage tank in real time and generate monitoring data; The dry-wet state conversion control end is connected with the end signal of the unit dry-wet state heat control system, and is used for automatically generating a dry-wet state conversion instruction according to the unit load and monitoring data; The water supply loop end is connected with the end signal of the unit dry-wet state heat control system and the dry-wet state conversion control end, and is used for executing switching operation between the main water supply pipeline and the side water supply pipeline to adjust the water supply flow in response to the dry-wet state conversion instruction. The unit dry-wet state heat control system end judges the system state based on the monitoring data of the water storage monitoring end, coordinates the dry-wet state conversion control end and the water supply loop end to execute dry-wet state conversion, and maintains the stable steam temperature.

[0006] Preferably, the water storage monitoring end comprises: A water storage liquid level detection module for detecting the real-time liquid level of the water storage tank; A water storage temperature detection module for detecting the real-time temperature of the water storage tank; A liquid level amount feedback logic module for receiving the real-time liquid level and comparing it with a preset liquid level threshold value; A water temperature superheat calculation module for receiving the real-time temperature and calculating the superheat degree; The output signals of the liquid level amount feedback logic module and the water temperature superheat calculation module are sent to the unit dry-wet state heat control system end for judging whether the system should enter the dry state or the wet state.

[0007] Preferably, the dry-wet state conversion control end comprises: A unit load amount judgment logic module for comparing the current unit load with a preset load threshold value; A main / side water supply switching module for generating a main water supply and side water supply switching instruction when the unit load amount judgment logic module judges that the load meets the conversion condition; A coal amount adjustment module for adjusting the total coal amount at a preset rate during the conversion process; The unit load amount judgment logic module, the main / side water supply switching module and the coal amount adjustment module work cooperatively to respond to the load change and trigger the conversion process.

[0008] Preferably, the water supply loop end comprises: A main water supply pipeline and a side water supply pipeline, each being provided with a water supply adjusting door and an electric door before and after the water supply adjusting door; A steam-water separation module comprising a separator, a WDC valve and an electric valve after the WDC valve, for separating steam and water, and flowing the water into the water storage tank; A boiler water circulation loop module comprising a boiler water circulation pump, an outlet electric door and a water flow adjusting module, for circulating the water in the water storage tank back to the boiler; The feedwater regulating door, the electric door, the WDC valve, the electric valve behind the WDC valve, the boiler water circulating pump and the water flow regulating module are controlled by a unit dry-wet state heat control system end to realize accurate control of the feedwater flow.

[0009] Preferably, the dry-wet state conversion control end further comprises a feedwater regulating door flow detection module, a feedwater regulating door flow regulating module and a steam-driven feedwater pump rotating speed regulating module, the feedwater regulating door flow detection module is used for monitoring the feedwater flow fluctuation in real time during the conversion process, and the rotating speed of the pump is regulated through the feedwater regulating door flow regulating module and the steam-driven feedwater pump rotating speed regulating module.

[0010] In another aspect, the present application further provides a heat control optimization method of a thermal power unit, comprising the following steps: The dry-wet state conversion control end compares the current load of the unit with a preset load threshold, and judges whether the dry-wet state conversion condition is met in combination with the liquid level and temperature data of the water storage tank; When the conversion condition is met, the dry-wet state conversion operation is performed, instructions are sent from the unit dry-wet state heat control system end to the feedwater circuit end to control the switching between the main feedwater pipeline and the bypass feedwater pipeline, and the coal quantity is synchronously regulated. During the switching process, the feedwater flow is maintained stable through a flow detection and feedback mechanism until the system completes the conversion between the dry state and the wet state.

[0011] Preferably, during the execution of the dry-wet state conversion operation, when the feedwater pump does not have regulating capacity, the operation of switching the main feedwater to the bypass feedwater is performed, specifically comprising: starting the bypass electric door and the WDC valve, setting the feedwater pump to constant speed operation, and closing the main road electric door after monitoring that the bypass feedwater flow is stable.

[0012] Preferably, the flow detection and feedback mechanism comprises: when the feedwater regulating door or the electric door is regulated, the flow fluctuation is detected in real time, if the fluctuation is found, the current operation is paused, and after the flow returns to normal, the execution is continued.

[0013] In still another aspect, the present application further provides an electronic device having a computer program stored thereon, the computer program is executed by a processor to realize the heat control optimization method of the thermal power unit according to any one of the embodiments of the present application.

[0014] In still another aspect, the present application further provides a computer readable medium for storing one or more programs, when the one or more programs are executed by one or more processors, the one or more processors realize the heat control optimization method of the thermal power unit according to any one of the embodiments of the present application.

[0015] The present application has the following beneficial effects: 1. Through real-time accurate calculation of liquid level and superheat degree by the water storage monitoring end, the system can automatically and timely judge and execute dry-wet state conversion, avoid the hysteresis of manual judgment, significantly improve the conversion efficiency, and fundamentally guarantee the continuous stability of the unit steam temperature.

[0016] 2. Through intelligent switching (main / bypass) of the feedwater circuit end and integrated flow detection and feedback mechanism (such as pausing and resuming operation during fluctuations), closed-loop accurate control of feedwater flow is realized, effectively suppressing flow fluctuations during conversion, thereby greatly improving the stability of unit operation.

[0017] 3. The system realizes the automation of the whole process of dry-wet state conversion through the collaborative work of unit load judgment, coal quantity automatic adjustment, feedwater circuit automatic switching and other modules, reduces the dependence on the experience of operating personnel, reduces the risk of human error operation, and improves the intelligent level of overall control. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall system logic diagram proposed by the present application; Figure 2 The feedwater circuit end logic diagram proposed by the present application; Figure 3 The boiler water circulation loop module logic diagram proposed by the present application; Figure 4 The steam-water separation module logic diagram proposed by the present application; Figure 5 The water storage monitoring end logic diagram proposed by the present application; Figure 6 The dry-wet state conversion control end logic diagram proposed by the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0020] It should be understood that the step numbers used herein are only for the convenience of description, and are not limited to the execution sequence of the steps.

[0021] It is to be understood that the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting thereof. As used in the description of the application and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0022] The terms "including" and "comprising" are intended to be open and permit the presence of other features, integers, steps, operations, elements, components, and / or groups thereof without reversing the intended effect and / or function of the described features, integers, steps, operations, elements, components, and / or groups thereof.

[0023] The term "and / or" means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0024] Embodiment one: In order to make the purposes, technical solutions and advantages of the present application clearer, the following will combine specific embodiments of the present application, and refer to the accompanying drawings. Figure 1 The technical solutions of the present application are described clearly and completely.

[0025] To solve the problems in the prior art, the present embodiment provides a thermal control optimization system for a thermal power generating unit, comprising: a unit dry-wet thermal control system end, a feedwater circuit end, a dry-wet state conversion control end, and a water storage monitoring end; wherein: The unit dry-wet thermal control system end is used for receiving and processing real-time data from the feedwater circuit end, the dry-wet state conversion control end, and the water storage monitoring end, and coordinating the whole process of dry-wet state conversion. The water storage monitoring end is signal-connected with the unit dry-wet thermal control system end, and is used for monitoring the liquid level and temperature of the water storage tank in real time and generating monitoring data. As a preferred embodiment of the present embodiment, as shown in the accompanying drawings, Figure 5 The water storage monitoring end comprises: A water storage liquid level detection module is used for detecting the real-time liquid level of the water storage tank. A water storage temperature detection module is used for detecting the real-time temperature of the water storage tank. A liquid level amount feedback logic module is used for receiving the real-time liquid level and comparing it with a preset liquid level threshold value. The liquid level amount feedback logic module is data signal-connected with a water storage amount threshold value module, and the water storage amount threshold value module stores water storage amount threshold value information for system dry-wet conversion operation.

[0026] A water temperature overheating calculation module is used for receiving the real-time temperature and calculating the overheating degree. The water temperature overheating calculation module is data signal-connected with a water temperature threshold value module, and the water temperature threshold value module stores water temperature threshold value information for system dry-wet conversion operation.

[0027] The output signals of the liquid level feedback logic module and the water temperature overheating calculation module are sent to the unit dry-wet state thermal control system end for determining whether the system should enter the dry state or the wet state.

[0028] The dry-wet state conversion control end is connected with the unit dry-wet state thermal control system end signal for automatically generating a dry-wet state conversion instruction according to the unit load and monitoring data; As a preferred embodiment of the present embodiment, as shown in the accompanying Figure 6 The dry-wet state conversion control end includes: The unit load quantity judgment logic module is connected with the dry-wet state conversion load quantity preset module and the coal quantity adjustment module through data signals; The main / auxiliary water supply switching module is used for generating a main water supply and auxiliary water supply switching instruction when the unit load quantity judgment logic module determines that the load meets the conversion condition; The coal quantity adjustment module is used for adjusting the total coal quantity at a preset rate during the conversion process; The unit load quantity judgment logic module, the main / auxiliary water supply switching module and the coal quantity adjustment module work cooperatively to respond to the load change and trigger the conversion process.

[0029] As a preferred embodiment of the present embodiment, the dry-wet state conversion control end further includes a water supply adjustment door flow detection module, a water supply adjustment door flow adjustment module and a steam-driven water supply pump rotating speed adjustment module. The water supply adjustment door flow detection module is used for monitoring the water supply flow fluctuation in real time during the conversion process, and the pump rotating speed is adjusted through the water supply adjustment door flow adjustment module and the steam-driven water supply pump rotating speed adjustment module. The first water supply adjustment door and the second water supply adjustment door are connected with the water supply adjustment door flow adjustment module and the water supply adjustment door flow detection module, and the first steam-driven water supply pump and the second steam-driven water supply pump are connected with the steam-driven water supply pump rotating speed adjustment module.

[0030] The water supply circuit end is connected with the unit dry-wet state thermal control system end and the dry-wet state conversion control end signal for responding to the dry-wet state conversion instruction and performing the switching operation between the main water supply pipeline and the auxiliary water supply pipeline to adjust the water supply flow; As a preferred embodiment of the present embodiment, as shown in the accompanying Figure 2 The water supply circuit end includes: The main water supply pipeline and the auxiliary water supply pipeline are respectively provided with water supply adjustment doors and front and rear electric doors. The front and rear electric doors are connected with the water supply adjustment door front and rear electric door control module through electric signals, and the water supply adjustment door front and rear electric door control module is connected with the unit dry-wet state thermal control system end through signals. The water supply adjustment door front and rear electric door control module is connected with the unit dry-wet state thermal control system end through signals. Figure 4As shown, the steam-water separation module, including a separator, a WDC valve and a WDC valve post electric valve, is used to separate steam from water, and the water flows into the water storage tank; the separator is connected with the water storage tank through two pipelines, the WDC valve and the WDC valve post electric valve are connected on the two pipelines, and the WDC valve post electric valve is arranged behind the water outlet of the WDC valve; As shown in the accompanying drawings, the boiler water circulation loop module, including a boiler water circulation pump, a water outlet electric door and a water flow adjustment module, is used to circulate the water in the water storage tank to the boiler; Figure 3 As shown, the boiler water circulation loop module, including a boiler water circulation pump, a water outlet electric door and a water flow adjustment module, is used to circulate the water in the water storage tank to the boiler; Among them, the feedwater regulating door, the electric door, the WDC valve post electric valve, the boiler water circulation pump and the water flow adjustment module are controlled by the unit dry-wet state heat control system end to realize the accurate control of the feedwater flow.

[0031] Among them, the unit dry-wet state heat control system end judges the system state based on the monitoring data of the water storage monitoring end, and coordinates the dry-wet state conversion control end and the feedwater loop end to execute the dry-wet state conversion, and maintains the stability of the steam temperature.

[0032] Example two: The embodiment provides a thermal control optimization method of a thermal power generating unit, which comprises the following steps: The dry-wet state conversion control end compares the current load of the unit with the preset load threshold value, and judges whether the dry-wet state conversion condition is met in combination with the liquid level and temperature data of the water storage tank; After the system is started, the unit dry-wet state heat control system end starts to run continuously. The water storage monitoring end starts to work, and the liquid level and temperature data of the water storage tank are collected in real time through the internal water storage liquid level detection module and the water storage temperature detection module. These real-time data are sent to the liquid level amount feedback logic module and the water temperature superheat calculation module.

[0033] The liquid level amount feedback logic module compares the real-time liquid level with the preset liquid level threshold value (for example, a dry-to-wet judgment threshold value and a wet-to-dry judgment threshold value). The water temperature superheat calculation module calculates the current water superheat degree (i.e. the difference between the current temperature and the saturation temperature) according to the real-time temperature. These processed monitoring data are uploaded to the unit dry-wet state heat control system end in real time, which provides a basis for state judgment.

[0034] At the same time, the unit load amount judgment logic module of the dry-wet state conversion control end continuously monitors the current load (MCR) of the unit, and compares it with the preset load threshold value (in this embodiment, 20%-30% MCR).

[0035] The unit dry-wet state heat control system end comprehensively processes the data from the water storage monitoring end and the dry-wet state conversion control end, and intelligently judges. In this embodiment, the dry-wet state conversion condition is: Dry-to-wet condition determination: When the unit is in the process of reducing load, if the unit load quantity determination logic module determines that the current load is lower than the preset load threshold (such as 25% MCR), and the water temperature superheat calculation module calculates that the superheat is lower than 0°C (or another set value), and the liquid level feedback logic module determines that the water tank liquid level is higher than the wet state entering liquid level threshold, the system determines that the dry-to-wet condition is met.

[0036] Wet-to-dry condition determination: When the unit is in the process of increasing load, if the unit load quantity determination logic module determines that the current load is higher than the preset load threshold, and the water temperature superheat calculation module calculates that the superheat is higher than 5°C (or another set value), and the liquid level feedback logic module determines that the water tank liquid level is lower than the dry state entering liquid level threshold (such as 500 mm), the system determines that the wet-to-dry condition is met.

[0037] When the conversion condition is met, the dry-wet state conversion operation is performed, and the dry-wet state heat control system end of the unit sends an instruction to the feedwater circuit end to control the switching between the main feedwater pipe and the bypass feedwater pipe, and simultaneously adjust the coal quantity; Taking the dry-to-wet operation as an example, the specific switching process is as follows: Instruction generation: The main / bypass feedwater switching module of the dry-wet state conversion control end generates a switching instruction according to the determination result. For example, if the system determines that the feedwater pump does not have adjustment capability at this time, the instruction is "switch the main feedwater to the bypass feedwater".

[0038] Feedwater circuit switching: The feedwater circuit end receives the instruction and executes it. Specifically, first, open the electric doors before and after the feedwater adjustment door (second feedwater adjustment door) on the bypass feedwater pipe and the WDC valve after the electric valve related to the steam-water separation module pipe. Then, set the second steam-driven feedwater pump to a constant speed operation mode. After monitoring that the bypass feedwater flow is stable, close the electric doors before and after the feedwater adjustment door (first feedwater adjustment door) on the main feedwater pipe, and complete the switching.

[0039] Coordinated control: In this process, the coal quantity adjustment module reduces the total coal quantity at a preset rate (such as 10-20 t / h) to match the load decrease. At the same time, the boiler water circulation loop module is put into operation according to the water tank liquid level, for example, when the liquid level is higher than 4000 mm, the boiler water circulation pump is started, and its outlet electric door, water flow adjustment module, etc. are controlled to circulate the boiler water to the boiler.

[0040] During the switching process, the flow detection and feedback mechanism is used to maintain stable feedwater flow until the system completes the conversion between the dry state and the wet state.

[0041] During the switching process, the flow detection and feedback mechanism continues to work to ensure stable feedwater flow. The feedwater adjustment door flow detection module of the dry-wet state conversion control end monitors the flow of the main and bypass feedwater pipes in real time.

[0042] When adjusting the feedwater regulating door or operating the electric door, if the flow fluctuation is detected (for example, the flow rate change rate exceeds a certain threshold value), the unit dry-wet state heat control system end will immediately issue instructions through the feedwater regulating door flow adjustment module and the steam feedwater pump speed adjustment module to suspend the current adjustment or switching operation.

[0043] The system maintains the current state, and after the flow detection module feedbacks that the flow has returned to normal and stable, the suspended operation is continued. The closed-loop control mechanism of "detection-suspension-recovery" effectively suppresses the flow fluctuation and provides a fundamental guarantee for the stability of the steam temperature.

[0044] The system continuously monitors the data at the water storage monitoring end. For dry to wet, when the water tank liquid level is stable at a high level and the superheat degree is continuously below the set value, the system determines that it has completely entered the wet state. For wet to dry, when the water tank liquid level drops below the low threshold value (such as 500 mm) and the superheat degree is continuously higher than the set value, the system determines that it has completely entered the dry state. Subsequently, the system exits the conversion control mode and enters the steady-state operation monitoring.

[0045] Embodiment three: The embodiment provides an electronic device, which has a computer program stored thereon, and the computer program is executed by a processor to implement the thermal control optimization method of the thermal power unit according to any one of the embodiments of the present application.

[0046] Embodiment four: The embodiment provides a computer readable medium for storing one or more programs, and when the one or more programs are executed by one or more processors, the one or more processors implement the thermal control optimization method of the thermal power unit according to any one of the embodiments of the present application.

[0047] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can mean: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, and c can be single or multiple.

[0048] Those skilled in the art can clearly understand that the units and algorithm steps described in the embodiments disclosed herein can be realized by electronic hardware, computer software and a combination of the two. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0049] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0050] In several embodiments provided in the present application, any function realized in the form of a software function unit and sold or used as an independent product can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0051] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent flow transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A thermal control optimization system for a thermal power generating unit, characterized in that, The system comprises: The unit dry and wet state thermal control system end, the water supply circuit end, the dry and wet state conversion control end and the water storage monitoring end; wherein: The unit dry and wet state thermal control system end is used for receiving and processing real-time data from the water supply circuit end, the dry and wet state conversion control end and the water storage monitoring end, and coordinating the whole process of dry and wet state conversion; The water storage monitoring end is signal connected with the unit dry and wet state thermal control system end, and is used for monitoring the liquid level and temperature of the water storage tank in real time and generating monitoring data; The dry and wet state conversion control end is signal connected with the unit dry and wet state thermal control system end, and is used for automatically generating dry and wet state conversion instructions according to the unit load and monitoring data; The water supply circuit end is signal connected with the unit dry and wet state thermal control system end and the dry and wet state conversion control end, and is used for responding to the dry and wet state conversion instructions, executing switching operation between the main water supply pipeline and the side water supply pipeline, and adjusting the water supply flow; The unit dry and wet state thermal control system end is based on the monitoring data of the water storage monitoring end to judge the system state, and coordinates the dry and wet state conversion control end and the water supply circuit end to execute dry and wet state conversion, and maintains the stable steam temperature.

2. The thermal control optimization system of claim 1, wherein: The water storage monitoring end comprises: A water storage liquid level detection module for detecting the real-time liquid level of the water storage tank; A water storage temperature detection module for detecting the real-time temperature of the water storage tank; A liquid level amount feedback logic module for receiving the real-time liquid level and comparing with the preset liquid level threshold; A water temperature superheat calculation module for receiving the real-time temperature and calculating the superheat degree; The output signals of the liquid level amount feedback logic module and the water temperature superheat calculation module are sent to the unit dry and wet state thermal control system end, which is used for judging whether the system should enter the dry state or the wet state.

3. The thermal control optimization system of claim 1, wherein: The dry and wet state conversion control end comprises: A unit load amount judgment logic module for comparing the current unit load with the preset load threshold; A main / side water supply switching module for generating the instructions of switching the main water supply and the side water supply when the unit load amount judgment logic module judges that the load meets the conversion condition; A coal amount adjustment module for adjusting the total coal amount at a preset rate during the conversion process; The unit load amount judgment logic module, the main / side water supply switching module and the coal amount adjustment module work cooperatively to respond to the load change and trigger the conversion process.

4. The thermal control optimization system of claim 1, wherein: The water supply circuit end comprises: A main water supply pipeline and a side water supply pipeline, which are respectively provided with a water supply adjusting door and electric doors before and after the water supply adjusting door; A steam-water separation module comprising a separator, a WDC valve and an electric valve after the WDC valve, which is used for separating the steam and the water, and the water flows into the water storage tank; A boiler water circulation loop module comprising a boiler water circulation pump, an outlet electric door and a water flow adjusting module, which is used for circulating the water in the water storage tank back to the boiler; The water supply adjusting door, the electric door, the electric valve after the WDC valve, the boiler water circulation pump and the water flow adjusting module are all controlled by the unit dry and wet state thermal control system end, so as to realize the accurate control of the water supply flow.

5. The thermal control optimization system of a thermal power generating unit according to claim 1, characterized in that: The dry and wet state conversion control end further comprises a water supply adjusting door flow detection module, a water supply adjusting door flow adjusting module and a steam-driven water pump rotating speed adjusting module, the water supply adjusting door flow detection module is used for monitoring the water supply flow fluctuation in real time during the conversion process, and the pump rotating speed is adjusted through the water supply adjusting door flow adjusting module and the steam-driven water pump rotating speed adjusting module.

6. A thermal control optimization method of a thermal power generating unit, based on the thermal control optimization system of any one of claims 1 to 5, characterized in that, The system comprises the following steps: The current load of the unit is compared with the preset load threshold through the dry-wet state conversion control terminal, and whether the dry-wet state conversion condition is met is judged in combination with the liquid level and temperature data of the water storage tank; When the conversion condition is met, the dry-wet state conversion operation is performed, instructions are sent from the dry-wet state heat control system end to the feedwater circuit end to control the switching between the main feedwater pipeline and the bypass feedwater pipeline, and the coal quantity is adjusted synchronously; In the switching process, the flow detection and feedback mechanism is used to maintain the stability of the feedwater flow until the system completes the conversion between the dry state and the wet state.

7. The method of claim 6, wherein the method further comprises: In the process of performing the dry-wet state conversion operation, when the feedwater pump does not have adjustment capability, the operation of switching the main feedwater to the bypass feedwater is performed, specifically including: starting the bypass electric door and the WDC valve, setting the feedwater pump to constant speed operation, and closing the main road electric door after monitoring that the bypass feedwater flow is stable.

8. The method of claim 6, wherein the method further comprises: The flow detection and feedback mechanism includes: when adjusting the feedwater regulating door or the electric door, the flow fluctuation is detected in real time, if the fluctuation is found, the current operation is paused, and after the flow returns to normal, the operation is continued.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the thermal control optimization method of the thermal power unit as claimed in claims 6-8.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the thermal control optimization method of the thermal power unit as claimed in claims 6-8.

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