Electrothermal coupling regenerative system for thermal power generating unit

Abstract

The invention relates to the technical field of coal-fired units, and discloses an electrothermal coupling regenerative system for a thermal power unit. The first high-pressure heater and the second high-pressure heater are used for supplying water; the power supply is used for driving the electric heater to perform heating control on feed water in the first high-pressure heater and the second high-pressure heater; the steam electric shut-off valve is used for controlling opening and closing of the valve; the control device is electrically connected to the power source and the electric heater and used for managing and controlling the power source and the electric heater, new energy surplus electricity or off-peak electricity is used for heating feedwater of the heat regeneration system, the feedwater temperature is increased, the fire coal amount is reduced, the transformation investment and the safety risk are greatly reduced, and the energy consumption is reduced. The coupling with the coal power unit can reduce the minimum power generation load of the unit and improve the variable load rate.

Description

Technical Field

[0001] The present invention relates to the technical field of coal-fired units, and in particular to an electric-thermal coupled heat recovery system for a thermal power unit. Background Art

[0002] How to form an industrial path that is "technically feasible, economically affordable, and scalable" in the "new generation coal-fired power" upgrade action is still a real problem that the majority of coal-fired power companies have to face.

[0003] The application of technologies such as biomass, green ammonia, and CCUS, mentioned in the "Action Plan for Low-Carbon Coal Power Transformation and Construction," involves technological innovation, industrial innovation, and business model innovation in the energy transition. Currently, most technologies are still in the early stages of demonstration and commercialization, and without exception, they face the practical challenge of high costs. Therefore, finding ways to absorb renewable energy power or reduce the generation load of units to create space for new energy consumption is particularly important. Summary of the Invention

[0004] An embodiment of the present invention provides an electric-thermal coupled heat recovery system for a thermal power unit. This system utilizes surplus electricity from renewable energy sources or off-peak electricity to heat the heat recovery system feed water, thereby increasing the feed water temperature, reducing the amount of coal burned, and significantly lowering transformation investment and safety risks. Coupling with a coal-fired power unit can also reduce the unit's minimum power generation load and increase the load change rate.

[0005] In order to achieve the above-mentioned object, the present invention provides an electric-thermal coupled heat recovery system for a thermal power unit, comprising: economizer; a first high-pressure heater and a second high-pressure heater, wherein the first high-pressure heater and the second high-pressure heater are used for feeding water; a power supply and an electric heater, wherein the power supply is used to drive the electric heater to heat the feed water in the first high-pressure heater and the second high-pressure heater; Steam electric shut-off valve, used to control the opening and closing of the valve; A control device is electrically connected to the power supply and the electric heater, and is used to manage and control the power supply and the electric heater.

[0006] Furthermore, the control device includes: a data acquisition module, configured to obtain temperature data of the economizer, wherein the temperature data includes an inlet water temperature of the economizer and an inlet water temperature of the water wall; A data judgment module is used to judge whether the electrothermal coupling heat recovery system meets the preset coupling requirements according to the inlet water temperature of the economizer and the inlet water temperature of the water wall; The heating control module is used to issue a continuous control instruction when the electric-thermal coupling heat recovery system meets the preset coupling requirements, and to manage and control the power supply and electric heater when the electric-thermal coupling heat recovery system does not meet the preset coupling requirements.

[0007] Furthermore, the data judgment module is used to: The data judgment module is used to obtain a preset first preset inlet water temperature and a second preset inlet water temperature; The data judgment module is used to judge whether the inlet water temperature is greater than the first preset inlet water temperature, and whether the water wall inlet water temperature is greater than the second preset inlet water temperature. If so, it is judged that the electrothermal coupling heat regeneration system meets the preset coupling requirement; The data judgment module is used to determine that if no, the electric-thermal coupling heat recovery system does not meet the preset coupling requirement.

[0008] Furthermore, the heating control module is used to: The heating control module is used to set a water temperature collection interval when the electric heat coupling heat recovery system does not meet the preset coupling requirements, wherein the water temperature collection interval includes multiple water temperature collection time sections; The heating control module is used to collect multiple sets of inlet water temperatures and multiple sets of water-cooled wall inlet water temperatures based on the water temperature collection time section; The heating control module is used to calculate the first adjustment factor of the electrothermal coupling regenerative system based on all inlet water temperatures, and calculate the second adjustment factor of the electrothermal coupling regenerative system based on all water wall inlet water temperatures; The heating control module is configured to adjust the power of the electric heater based on the first adjustment factor and the second adjustment factor to obtain a target heating power.

[0009] Furthermore, the heating control module is used to: The heating control module is used to sort all inlet water temperatures in ascending order and determine a standard inlet water temperature, wherein the standard inlet water temperature is the average of all inlet water temperatures; The heating control module is used to pre-set a first preset change value and a second preset change value, wherein the first change value is smaller than the second preset change value; The heating control module is configured to calculate a product value of the first preset change value and the standard inlet water temperature as a first changed inlet water temperature, and calculate a product value of the second preset change value and the standard inlet water temperature as a second changed inlet water temperature; The heating control module is used to determine a minimum inlet water temperature, and take the inlet water temperature between the minimum inlet water temperature and the first variable inlet water temperature as a first inlet water temperature set; The heating control module is configured to use an inlet water temperature between the first changed inlet water temperature and the second changed inlet water temperature as a second inlet water temperature set; The heating control module is used to determine a maximum inlet water temperature, and take an inlet water temperature between the second variable inlet water temperature and the maximum inlet water temperature as a third inlet water temperature set; The heating control module is configured to calculate a first adjustment factor of the electrothermal coupled regenerative system based on the first inlet water temperature set, the second inlet water temperature set, and the third inlet water temperature set.

[0010] Furthermore, the heating control module is used to: The heating control module is configured to count a first set number of the first inlet water temperature set, a second set number of the second inlet water temperature set, and a third set number of the third inlet water temperature set; The heating control module is used to calculate the first adjustment factor of the electrothermal coupling regenerative system according to the following formula; ; Among them, b is the first adjustment factor of the electrothermal coupled heat recovery system, m is the number of inlet water temperatures, n v is the vth inlet water temperature, c1 is the first changed inlet water temperature, c2 is the second changed inlet water temperature, k1 is the first set number, k2 is the second set number, and k3 is the third set number.

[0011] Furthermore, the heating control module is used to: The heating control module is used to determine the initial water temperature collection time section and the final water temperature collection time section from all water temperature collection time sections; The heating control module is used to determine the initial water wall inlet water temperature corresponding to the initial water temperature collection time node, and determine the final water wall inlet water temperature corresponding to the final water temperature collection time node; The heating control module is used to determine a first water temperature difference between the initial water wall inlet water temperature and the final water wall inlet water temperature, wherein the first water temperature difference is an absolute value of the difference between the initial water wall inlet water temperature and the final water wall inlet water temperature; The heating control module is used to extract the maximum water-cooled wall inlet water temperature and the minimum water-cooled wall inlet water temperature from all water-cooled wall inlet water temperatures; The heating control module is configured to determine a second water temperature difference between the maximum water wall inlet water temperature and the minimum water wall inlet water temperature, wherein the second water temperature difference is an absolute value of a difference between the initial water wall inlet water temperature and the final water wall inlet water temperature; The heating control module is used to calculate a ratio of the first water temperature difference to the second water temperature difference as a second adjustment factor of the electrothermal coupling regenerative system.

[0012] Furthermore, the heating control module is used to: The heating control module is configured to configure a first calculation coefficient for the first adjustment factor and a second calculation coefficient for the second adjustment factor; The heating control module is used to calculate the comprehensive adjustment factor of the electrothermal coupling regenerative system according to the following formula: ; Among them, s is the comprehensive adjustment factor of the electric-thermal coupled heat recovery system, q1 is the first calculation coefficient, b is the first adjustment factor, q2 is the second calculation coefficient, and w is the second adjustment factor.

[0013] Furthermore, the heating control module is used to: The heating control module is used to obtain the current heating power of the electric heater; The heating control module is used to adjust the current heating power based on the comprehensive adjustment factor to obtain the target heating power.

[0014] Furthermore, the heating control module is used to: The heating control module is used to pre-set a first preset comprehensive adjustment factor and a second preset comprehensive adjustment factor; Presetting a first preset control factor, a second preset control factor, and a third preset control factor; When the comprehensive adjustment factor is less than the first preset comprehensive adjustment factor, the product value of the first preset control factor and the current heating power is calculated as the target heating power of the electric heater; When the comprehensive adjustment factor is greater than or equal to the first preset comprehensive adjustment factor and less than the second preset comprehensive adjustment factor, the product of the second preset control factor and the current heating power is calculated as the target heating power of the electric heater; When the comprehensive adjustment factor is greater than or equal to the second preset comprehensive adjustment factor, the product value of the third preset control factor and the current heating power is calculated as the target heating power of the electric heater.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses an electric-thermal coupled heat recovery system for a thermal power unit, comprising: an economizer; a first high-pressure heater and a second high-pressure heater, the first high-pressure heater and the second high-pressure heater being used for feed water; a power supply and an electric heater, the power supply being used to drive the electric heater to heat and control the feed water in the first high-pressure heater and the second high-pressure heater; a steam electric shut-off valve being used to control the opening and closing of the valve; a control device being electrically connected to the power supply and the electric heater, the control device being used to manage and control the power supply and the electric heater. The present invention utilizes surplus electricity from new energy or off-peak electricity to heat the feed water of the heat recovery system, thereby increasing the feed water temperature, reducing the amount of coal burned, and significantly reducing the transformation investment and safety risks. Coupling with a coal-fired power unit can also reduce the minimum power generation load of the unit and increase the load change rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings: Figure 1 The figure shows a schematic structural diagram of an electric-thermal coupled heat recovery system for a thermal power unit according to an embodiment of the present invention.

[0017] In the figure, 1. economizer; 2. power supply; 3. electric heater; 4. first high-pressure heater; 5. steam electric shut-off valve; 6. second high-pressure heater. DETAILED DESCRIPTION

[0018] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0019] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0022] The following is a description of preferred embodiments of the present invention with reference to the accompanying drawings.

[0023] like Figure 1 As shown, an embodiment of the present invention discloses an electric-thermal coupled heat recovery system for a thermal power unit, comprising: Economizer 1; a first high-pressure heater 4 and a second high-pressure heater 6, wherein the first high-pressure heater and the second high-pressure heater 6 are used for feeding water; A power supply 2 and an electric heater 3, wherein the power supply 2 is used to drive the electric heater 3 to heat the feed water in the first high-pressure heater 4 and the second high-pressure heater 6; Steam electric shut-off valve 5, used to control the opening and closing of the valve; The control device is electrically connected to the power supply 2 and the electric heater 3 , and is used to manage and control the power supply 2 and the electric heater 3 .

[0024] In this embodiment, when there is new energy electricity or off-peak electricity that needs to be consumed, the power supply 2 drives the electric heater 3 to work. At this time, the steam electric shut-off valve 5 can be closed, and the outlet water temperature of the first high-pressure heater 4 is consistent with the outlet water temperature of the second high-pressure heater 6, thereby increasing the feed water temperature and entering the economizer 1. The amount of coal burned is reduced under the same load condition of the boiler. When the unit is in deep peak-shaving condition, the increase in the inlet water temperature of the economizer 1 causes the inlet flue gas temperature of the SCR denitrification system to increase, thereby improving the unit's wide load denitrification adaptability. Finally, due to the increase in the inlet water temperature of the economizer 1, the outlet water temperature of the economizer 1, i.e., the inlet water temperature of the water-cooled wall, is also increased accordingly, thereby reducing the water-cooled wall inlet under-enthalpy, significantly improving the hydrodynamic characteristics of the boiler under wide load conditions, and greatly improving the operational safety of the boiler water-cooled wall.

[0025] In some embodiments of the present application, the control device includes: A data acquisition module, configured to obtain temperature data of the economizer 1, wherein the temperature data includes the inlet water temperature of the economizer 1 and the inlet water temperature of the water wall; A data judgment module is used to judge whether the electrothermal coupling heat recovery system meets the preset coupling requirements based on the inlet water temperature of the economizer 1 and the inlet water temperature of the water wall; The heating control module is used to issue continuous control instructions when the electric-thermal coupling heat recovery system meets the preset coupling requirements, and to manage and control the power supply and electric heater 3 when the electric-thermal coupling heat recovery system does not meet the preset coupling requirements.

[0026] In some embodiments of the present application, the data determination module is used to: The data judgment module is used to obtain a preset first preset inlet water temperature and a second preset inlet water temperature; The data judgment module is used to judge whether the inlet water temperature is greater than the first preset inlet water temperature, and whether the water wall inlet water temperature is greater than the second preset inlet water temperature. If so, it is judged that the electrothermal coupling heat regeneration system meets the preset coupling requirement; The data judgment module is used to determine that if no, the electric-thermal coupling heat recovery system does not meet the preset coupling requirement.

[0027] In this embodiment, the first preset inlet water temperature and the second preset inlet water temperature can be set according to actual needs and are not specifically limited here.

[0028] In this embodiment, when the inlet water temperature is greater than the first preset inlet water temperature and the water-cooled wall inlet water temperature is greater than the second preset inlet water temperature, it is determined that the electrothermal coupling heat regeneration system meets the preset coupling requirements. If not, the electrothermal coupling heat regeneration system needs to be controlled.

[0029] The beneficial effect of the above technical solution is that the present invention can judge whether the electric-thermal coupling heat recovery system of the current thermal power unit meets the preset requirements based on the inlet water temperature and the water-cooled wall inlet water temperature, and provide technical support for the control of the electric-thermal coupling heat recovery system.

[0030] In some embodiments of the present application, the heating control module is used to: The heating control module is used to set a water temperature collection interval when the electric heat coupling heat recovery system does not meet the preset coupling requirements, wherein the water temperature collection interval includes multiple water temperature collection time sections; The heating control module is used to collect multiple sets of inlet water temperatures and multiple sets of water-cooled wall inlet water temperatures based on the water temperature collection time section; The heating control module is used to calculate the first adjustment factor of the electrothermal coupling regenerative system based on all inlet water temperatures, and calculate the second adjustment factor of the electrothermal coupling regenerative system based on all water wall inlet water temperatures; The heating control module is used to adjust the power of the electric heater 3 based on the first adjustment factor and the second adjustment factor to obtain a target heating power.

[0031] In this embodiment, the water temperature collection time section is a specific collection time, such as the 1st second, the 5th second, the 9th second, etc. Here, the number of water temperature collection intervals is preferably 15, which constitute the water temperature collection interval.

[0032] In this embodiment, as described above, 15 sets of inlet water temperatures and water wall inlet water temperatures can be collected.

[0033] In some embodiments of the present application, the heating control module is used to: The heating control module is used to sort all inlet water temperatures in ascending order and determine a standard inlet water temperature, wherein the standard inlet water temperature is the average of all inlet water temperatures; The heating control module is used to pre-set a first preset change value and a second preset change value, wherein the first change value is smaller than the second preset change value; The heating control module is configured to calculate a product value of the first preset change value and the standard inlet water temperature as a first changed inlet water temperature, and calculate a product value of the second preset change value and the standard inlet water temperature as a second changed inlet water temperature; The heating control module is used to determine a minimum inlet water temperature, and take the inlet water temperature between the minimum inlet water temperature and the first variable inlet water temperature as a first inlet water temperature set; The heating control module is configured to use an inlet water temperature between the first changed inlet water temperature and the second changed inlet water temperature as a second inlet water temperature set; The heating control module is used to determine a maximum inlet water temperature, and take an inlet water temperature between the second variable inlet water temperature and the maximum inlet water temperature as a third inlet water temperature set; The heating control module is configured to calculate a first adjustment factor of the electrothermal coupled regenerative system based on the first inlet water temperature set, the second inlet water temperature set, and the third inlet water temperature set.

[0034] In this embodiment, the first preset change value is preferably 0.95, and the second preset change value is preferably 1.15.

[0035] The beneficial effect of the above technical solution is: the present invention calculates the first adjustment factor of the electric thermal coupling heat recovery system based on the first inlet water temperature set, the second inlet water temperature set and the third inlet water temperature set. The present invention ensures the calculation accuracy of the first adjustment factor. The change of the inlet water temperature can be fed back through the first adjustment factor, thereby providing a basis for the power regulation of the electric heater 3.

[0036] In some embodiments of the present application, the heating control module is used to: The heating control module is configured to count a first set number of the first inlet water temperature set, a second set number of the second inlet water temperature set, and a third set number of the third inlet water temperature set; The heating control module is used to calculate the first adjustment factor of the electrothermal coupling regenerative system according to the following formula; ; Among them, b is the first adjustment factor of the electrothermal coupled heat recovery system, m is the number of inlet water temperatures, n v is the vth inlet water temperature, c1 is the first changed inlet water temperature, c2 is the second changed inlet water temperature, k1 is the first set number, k2 is the second set number, and k3 is the third set number.

[0037] In some embodiments of the present application, the heating control module is used to: The heating control module is used to determine the initial water temperature collection time section and the final water temperature collection time section from all water temperature collection time sections; The heating control module is used to determine the initial water wall inlet water temperature corresponding to the initial water temperature collection time node, and determine the final water wall inlet water temperature corresponding to the final water temperature collection time node; The heating control module is used to determine a first water temperature difference between the initial water wall inlet water temperature and the final water wall inlet water temperature, wherein the first water temperature difference is an absolute value of the difference between the initial water wall inlet water temperature and the final water wall inlet water temperature; The heating control module is used to extract the maximum water-cooled wall inlet water temperature and the minimum water-cooled wall inlet water temperature from all water-cooled wall inlet water temperatures; The heating control module is configured to determine a second water temperature difference between the maximum water wall inlet water temperature and the minimum water wall inlet water temperature, wherein the second water temperature difference is an absolute value of a difference between the initial water wall inlet water temperature and the final water wall inlet water temperature; The heating control module is used to calculate a ratio of the first water temperature difference to the second water temperature difference as a second adjustment factor of the electrothermal coupling regenerative system.

[0038] The beneficial effect of the above technical solution is that the present invention calculates the ratio of the first water temperature difference to the second water temperature difference as the second adjustment factor of the electrothermal coupled heat regeneration system. This ensures the calculation accuracy and efficiency of the second adjustment factor. This second adjustment factor can be used to provide feedback on changes in the water temperature at the water wall inlet, thereby providing a basis for power regulation of the electric heater 3.

[0039] In some embodiments of the present application, the heating control module is used to: The heating control module is configured to configure a first calculation coefficient for the first adjustment factor and a second calculation coefficient for the second adjustment factor; The heating control module is used to calculate the comprehensive adjustment factor of the electrothermal coupling regenerative system according to the following formula: ; Among them, s is the comprehensive adjustment factor of the electric-thermal coupled heat recovery system, q1 is the first calculation coefficient, b is the first adjustment factor, q2 is the second calculation coefficient, and w is the second adjustment factor.

[0040] In this embodiment, the first calculation coefficient is preferably 0.7, and the second calculation coefficient is preferably 0.3.

[0041] The beneficial effects of the above technical solution are: the power of the electric heater 3 is adjusted based on the first adjustment factor and the second adjustment factor to obtain the target heating power, and the changes in the inlet water temperature and the water-cooled wall inlet water temperature are comprehensively considered to ensure the comprehensiveness and accuracy of the power adjustment of the electric heater 3.

[0042] In some embodiments of the present application, the heating control module is used to: The heating control module is used to obtain the current heating power of the electric heater 3; The heating control module is used to adjust the current heating power based on the comprehensive adjustment factor to obtain the target heating power.

[0043] In some embodiments of the present application, the heating control module is used to: The heating control module is used to pre-set a first preset comprehensive adjustment factor and a second preset comprehensive adjustment factor; Presetting a first preset control factor, a second preset control factor, and a third preset control factor; When the comprehensive adjustment factor is less than the first preset comprehensive adjustment factor, the product value of the first preset control factor and the current heating power is calculated as the target heating power of the electric heater 3; When the comprehensive adjustment factor is greater than or equal to the first preset comprehensive adjustment factor and less than the second preset comprehensive adjustment factor, the product value of the second preset control factor and the current heating power is calculated as the target heating power of the electric heater 3; When the comprehensive adjustment factor is greater than or equal to the second preset comprehensive adjustment factor, the product value of the third preset control factor and the current heating power is calculated as the target heating power of the electric heater 3 .

[0044] In this embodiment, the first preset comprehensive adjustment factor is preferably 4, and the second preset comprehensive adjustment factor is preferably 7, which can be adjusted according to actual conditions.

[0045] In this embodiment, the first preset control factor is preferably 1.05, the second preset control factor is preferably 1.15, and the third preset control factor is preferably 1.25, which can be adjusted according to actual conditions.

[0046] The beneficial effect of the above technical solution is: the present invention selects the corresponding preset control factor according to the relationship between the comprehensive adjustment factor, the first preset comprehensive adjustment factor and the second preset comprehensive adjustment factor, realizes the intelligent control of the electric heater, obtains the target heating power, and ensures that the water temperature at the water-cooled wall inlet and the inlet water temperature meet the predetermined requirements.

[0047] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0048] While the present invention has been described above with reference to exemplary embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various features of the disclosed embodiments may be combined with one another in any manner, provided no structural conflicts exist. These combinations are not fully described in this specification for reasons of space and resource conservation.

[0049] Those skilled in the art will understand that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will still be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electric-thermal coupled heat recovery system for a thermal power unit, characterized in that: include: economizer; a first high-pressure heater and a second high-pressure heater, wherein the first high-pressure heater and the second high-pressure heater are used for feeding water; a power supply and an electric heater, wherein the power supply is used to drive the electric heater to heat the feed water in the first high-pressure heater and the second high-pressure heater; Steam electric shut-off valve, used to control the opening and closing of the valve; A control device is electrically connected to the power supply and the electric heater, and is used to manage and control the power supply and the electric heater.

2. The electric-thermal coupling heat recovery system for a thermal power unit according to claim 1, characterized in that: The control device comprises: a data acquisition module, configured to obtain temperature data of the economizer, wherein the temperature data includes an inlet water temperature of the economizer and an inlet water temperature of the water wall; A data judgment module is used to judge whether the electrothermal coupling heat recovery system meets the preset coupling requirements according to the inlet water temperature of the economizer and the inlet water temperature of the water wall; The heating control module is used to issue a continuous control instruction when the electric-thermal coupling heat recovery system meets the preset coupling requirements, and to manage and control the power supply and electric heater when the electric-thermal coupling heat recovery system does not meet the preset coupling requirements.

3. The electric-thermal coupling heat recovery system for a thermal power unit according to claim 2, characterized in that: The data judgment module is used to: The data judgment module is used to obtain a preset first preset inlet water temperature and a second preset inlet water temperature; The data judgment module is used to judge whether the inlet water temperature is greater than the first preset inlet water temperature, and whether the water wall inlet water temperature is greater than the second preset inlet water temperature. If so, it is judged that the electrothermal coupling heat regeneration system meets the preset coupling requirement; The data judgment module is used to determine that if no, the electric-thermal coupling heat recovery system does not meet the preset coupling requirement.

4. The electric-thermal coupling heat recovery system for a thermal power unit according to claim 2, characterized in that: The heating control module is used for: The heating control module is used to set a water temperature collection interval when the electric heat coupling heat recovery system does not meet the preset coupling requirements, wherein the water temperature collection interval includes multiple water temperature collection time sections; The heating control module is used to collect multiple sets of inlet water temperatures and multiple sets of water-cooled wall inlet water temperatures based on the water temperature collection time section; The heating control module is used to calculate the first adjustment factor of the electrothermal coupling regenerative system based on all inlet water temperatures, and calculate the second adjustment factor of the electrothermal coupling regenerative system based on all water wall inlet water temperatures; The heating control module is configured to adjust the power of the electric heater based on the first adjustment factor and the second adjustment factor to obtain a target heating power.

5. The electric-thermal coupling heat recovery system for a thermal power unit according to claim 4, characterized in that: The heating control module is used for: The heating control module is used to sort all inlet water temperatures in ascending order and determine a standard inlet water temperature, wherein the standard inlet water temperature is the average of all inlet water temperatures; The heating control module is used to pre-set a first preset change value and a second preset change value, wherein the first change value is smaller than the second preset change value; The heating control module is configured to calculate a product value of the first preset change value and the standard inlet water temperature as a first changed inlet water temperature, and calculate a product value of the second preset change value and the standard inlet water temperature as a second changed inlet water temperature; The heating control module is used to determine a minimum inlet water temperature, and take the inlet water temperature between the minimum inlet water temperature and the first variable inlet water temperature as a first inlet water temperature set; The heating control module is configured to use an inlet water temperature between the first changed inlet water temperature and the second changed inlet water temperature as a second inlet water temperature set; The heating control module is used to determine a maximum inlet water temperature, and take an inlet water temperature between the second variable inlet water temperature and the maximum inlet water temperature as a third inlet water temperature set; The heating control module is configured to calculate a first adjustment factor of the electrothermal coupled regenerative system based on the first inlet water temperature set, the second inlet water temperature set, and the third inlet water temperature set.

6. The electric-thermal coupling heat recovery system for a thermal power unit according to claim 5, characterized in that: The heating control module is used for: The heating control module is configured to count a first set number of the first inlet water temperature set, a second set number of the second inlet water temperature set, and a third set number of the third inlet water temperature set; The heating control module is used to calculate the first adjustment factor of the electrothermal coupling regenerative system according to the following formula; ； Among them, b is the first adjustment factor of the electrothermal coupled heat recovery system, m is the number of inlet water temperatures, n v is the vth inlet water temperature, c1 is the first changed inlet water temperature, c2 is the second changed inlet water temperature, k1 is the first set number, k2 is the second set number, and k3 is the third set number.

7. The electric-thermal coupled heat recovery system for a thermal power unit according to claim 4, characterized in that: The heating control module is used for: The heating control module is used to determine the initial water temperature collection time section and the final water temperature collection time section from all water temperature collection time sections; The heating control module is used to determine the initial water wall inlet water temperature corresponding to the initial water temperature collection time node, and determine the final water wall inlet water temperature corresponding to the final water temperature collection time node; The heating control module is used to determine a first water temperature difference between the initial water wall inlet water temperature and the final water wall inlet water temperature, wherein the first water temperature difference is an absolute value of the difference between the initial water wall inlet water temperature and the final water wall inlet water temperature; The heating control module is used to extract the maximum water-cooled wall inlet water temperature and the minimum water-cooled wall inlet water temperature from all water-cooled wall inlet water temperatures; The heating control module is configured to determine a second water temperature difference between the maximum water wall inlet water temperature and the minimum water wall inlet water temperature, wherein the second water temperature difference is an absolute value of a difference between the initial water wall inlet water temperature and the final water wall inlet water temperature; The heating control module is used to calculate a ratio of the first water temperature difference to the second water temperature difference as a second adjustment factor of the electrothermal coupling regenerative system.

8. The electric-thermal coupling heat recovery system for a thermal power unit according to claim 4, characterized in that: The heating control module is used for: The heating control module is configured to configure a first calculation coefficient for the first adjustment factor and a second calculation coefficient for the second adjustment factor; The heating control module is used to calculate the comprehensive adjustment factor of the electrothermal coupling regenerative system according to the following formula: ； Among them, s is the comprehensive adjustment factor of the electric-thermal coupled heat recovery system, q1 is the first calculation coefficient, b is the first adjustment factor, q2 is the second calculation coefficient, and w is the second adjustment factor.

9. The electric-thermal coupled heat recovery system for a thermal power unit according to claim 8, characterized in that: The heating control module is used for: The heating control module is used to obtain the current heating power of the electric heater; The heating control module is used to adjust the current heating power based on the comprehensive adjustment factor to obtain the target heating power.

10. The electric-thermal coupling heat recovery system for a thermal power unit according to claim 1, characterized in that: The heating control module is used for: The heating control module is used to pre-set a first preset comprehensive adjustment factor and a second preset comprehensive adjustment factor; Presetting a first preset control factor, a second preset control factor, and a third preset control factor; When the comprehensive adjustment factor is less than the first preset comprehensive adjustment factor, the product value of the first preset control factor and the current heating power is calculated as the target heating power of the electric heater; When the comprehensive adjustment factor is greater than or equal to the first preset comprehensive adjustment factor and less than the second preset comprehensive adjustment factor, the product of the second preset control factor and the current heating power is calculated as the target heating power of the electric heater; When the comprehensive adjustment factor is greater than or equal to the second preset comprehensive adjustment factor, the product value of the third preset control factor and the current heating power is calculated as the target heating power of the electric heater.

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