Elastic regenerative system under deep peak regulation of steam turbine with steam supplementing valve

Abstract

The utility model relates to the technical field of thermal power generation, in particular to an elastic heat regeneration system under deep peak regulation of a steam turbine with a steam supplementing valve, which comprises a deaerator, a booster pump, a water feeding pump, an existing final-stage high-pressure heater, a boiler and a high-pressure cylinder. A feed water outlet of the feed pump is communicated with a feed water inlet of the existing final-stage high-pressure heater, a feed water outlet of the existing final-stage high-pressure heater is communicated with a feed water inlet of the boiler, a steam outlet of the boiler is communicated with a steam inlet of the high-pressure cylinder, and a steam extraction opening of the high-pressure cylinder is communicated with a steam inlet of the existing final-stage high-pressure heater; the main steam valve and the steam supplementing valve are arranged in parallel, inlets of the main steam valve and the steam supplementing valve are both communicated with a steam outlet of the boiler, an outlet of the main steam valve is communicated with a steam inlet of the high-pressure cylinder, and an outlet of the steam supplementing valve and a steam extraction opening of the high-pressure cylinder are both communicated with a steam inlet of the hot secondary air heater; and a steam outlet of the hot secondary air heater is communicated with a steam inlet of the boiler. The utility model can improve the fuel utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology, and more specifically, to an elastic regenerative system for deep peak shaving of a steam turbine with a supplementary steam valve. Background Technology

[0002] Thermal power generation is a method of generating electricity by burning fossil fuels (such as coal, oil, and natural gas) or biomass fuels to convert the chemical energy in the fuels into thermal energy, which is then used to drive a generator through a thermodynamic cycle system (such as a steam turbine or gas turbine) to produce electricity. Existing thermal power generation systems have low thermal efficiency and incomplete carbon conversion. The thermal efficiency of conventional coal-fired power plants is typically 30%-40%, meaning that approximately 60%-70% of the fuel energy is lost as waste heat and not converted into electricity. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of low thermal efficiency in existing thermal power generation systems and to provide an elastic regenerative system for deep peak shaving of steam turbines with supplementary steam valves, which can improve fuel utilization, save energy, and improve thermal efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A flexible regenerative system for deep peak shaving of a steam turbine with a make-up steam valve is provided, comprising a deaerator, a booster pump, a feedwater pump, an existing final-stage high-pressure heater, a boiler, and a high-pressure cylinder. The deaerator, booster pump, and feedwater pump are sequentially connected. The feedwater outlet of the feedwater pump is connected to the feedwater inlet of the existing final-stage high-pressure heater, the feedwater outlet of the existing final-stage high-pressure heater is connected to the feedwater inlet of the boiler, the steam outlet of the boiler is connected to the steam inlet of the high-pressure cylinder, and the steam extraction port of the high-pressure cylinder is connected to the steam inlet of the existing final-stage high-pressure heater. The system also includes a main steam valve, a make-up steam valve, and a hot secondary air heater. The main steam valve and the make-up steam valve are connected in parallel, and their inlets are both connected to the steam outlet of the boiler. The outlet of the main steam valve is connected to the steam inlet of the high-pressure cylinder. The outlet of the make-up steam valve and the steam extraction port of the high-pressure cylinder are both connected to the steam inlet of the hot secondary air heater, and the steam outlet of the hot secondary air heater is connected to the steam inlet of the boiler.

[0006] This utility model discloses an elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve. The make-up steam valve couples the waste heat from the boiler tail flue gas for secondary utilization, supplying heat to the hot secondary air heater. This increases the temperature of the hot secondary air, optimizes combustion efficiency, and maintains the hot secondary air temperature stably within the design threshold range, reducing cold source loss by 15%-25%. It also improves the unit's frequency regulation dynamic performance, reduces overall coal consumption for power supply, and effectively solves the coupling problem of increased terminal temperature difference and insufficient frequency regulation capacity in the regenerative system under deep peak shaving conditions. Specifically, by adjusting the high-pressure steam exiting the boiler tail through the main steam valve and the make-up steam valve, the remaining high-temperature, high-pressure steam, after meeting the high-pressure cylinder requirements, directly enters the hot secondary air heater to heat the hot secondary air. The heated hot secondary air then returns to the boiler, realizing the secondary utilization of waste heat, further improving fuel utilization, saving energy, and increasing thermal efficiency.

[0007] Furthermore, it also includes a power generation controller, which is communicatively connected to both the main steam valve and the make-up steam valve. The power generation controller proportionally controls the main steam valve and make-up steam valve on the high-temperature, high-pressure steam exiting the boiler tail section. This ensures that while meeting the power generation requirements of the high-pressure cylinder, the remaining high-temperature, high-pressure steam directly enters the boiler's secondary hot air heater and utilizes its waste heat to heat the secondary hot air, thus achieving automatic control.

[0008] Furthermore, it also includes a newly added final-stage high-pressure heater. The steam outlet of the hot secondary air heater is connected to the steam inlet of the newly added final-stage high-pressure heater, the feedwater outlet of the newly added final-stage high-pressure heater is connected to the boiler feedwater inlet, and the feedwater inlet of the newly added final-stage high-pressure heater is connected to the feedwater outlet of the existing final-stage high-pressure heater. Adding a new final-stage high-pressure heater to the existing final-stage high-pressure heater is used to increase the boiler feedwater temperature. High-temperature, high-pressure steam from the boiler's hot secondary air heater enters the new final-stage high-pressure heater to heat the feedwater, thereby increasing the feedwater temperature entering the boiler. This allows for the consumption of less fuel while obtaining the same high-temperature, high-pressure steam, optimizing combustion efficiency and thus saving energy.

[0009] Furthermore, it also includes a low-pressure cylinder, a condenser, and a hot well connected in sequence. The feedwater inlet of the newly added final-stage high-pressure heater is also connected to the condenser, and the hot well is connected to the deaerator. The low-pressure cylinder, condenser, and hot well form an emergency drainage path, while the path from the feedwater inlet of the newly added final-stage high-pressure heater to the feedwater outlet of the existing final-stage high-pressure heater is a normal drainage path. Depending on the situation, the feedwater of the newly added final-stage high-pressure heater enters different paths.

[0010] Furthermore, a water level regulating valve is also provided in the newly added final-stage high-pressure heater. The water level regulating valve is used to monitor the water level in the newly added final-stage high-pressure heater to determine whether it is in a normal drainage state or an emergency drainage state, thereby selecting to control the feedwater flow direction, whether it enters the existing final-stage high-pressure heater through the normal drainage path or enters the condenser through the emergency drainage path.

[0011] Furthermore, the feedwater outlet of the feedwater pump is also connected to the feedwater inlet of the deaerator. Connecting the feedwater pump to the deaerator removes dissolved oxygen and prevents system corrosion. Specifically, if insufficiently deoxygenated water enters the boiler, oxygen will react with metal components, causing pitting or ulcerative corrosion. Connecting to the deaerator ensures that the water delivered by the feedwater pump is deoxygenated, protecting the safe operation of downstream systems (such as boilers and turbines). It also maintains feedwater temperature and improves thermal efficiency. Specifically, the deaerator typically uses turbine extraction steam to heat the feedwater, raising the water temperature to saturation temperature (approximately 104℃~160℃, depending on pressure). This not only facilitates deoxygenation but also reduces boiler heating energy consumption and improves thermal cycle efficiency. By connecting to the deaerator, the power generation system can recover and utilize the heat from low-grade steam (such as turbine extraction steam), reducing cold source losses and conforming to the "cascade utilization" principle of thermal systems. It also ensures the safe operation of the feedwater pump and achieves system pressure and process integration.

[0012] Furthermore, it also includes a hot primary air heater, wherein the steam extraction port of the high-pressure cylinder is connected to the steam inlet of the hot primary air heater, and the steam outlet of the hot primary air heater is connected to the steam inlet of the existing final-stage high-pressure heater. After the high-pressure cylinder generates electricity using high-temperature and high-pressure steam, the remaining gas enters the hot primary air heater to heat the hot primary air, which is also a form of waste heat reuse.

[0013] Furthermore, it also includes an intermediate-pressure cylinder, wherein the steam extraction port of the high-pressure cylinder is connected to the steam inlet of the intermediate-pressure cylinder, and the steam outlet of the intermediate-pressure cylinder is connected to the steam inlet of the hot primary air heater. The intermediate-pressure cylinder is used to reduce the pressure of the high-temperature and high-pressure steam, which then enters the hot primary air heater.

[0014] Furthermore, the existing final-stage high-pressure heater includes a No. 1 high-pressure heater, a No. 2 high-pressure heater, and a No. 3 high-pressure heater connected sequentially by pipelines. The feedwater outlet of the No. 1 high-pressure heater is connected to the inlet and outlet of the newly added final-stage high-pressure heater, and the feedwater inlet of the No. 3 high-pressure heater is connected to the feedwater outlet of the feedwater pump. These three high-pressure heaters are used to increase the feedwater temperature, ensuring that the feedwater entering the boiler meets the required temperature.

[0015] Furthermore, the boiler includes an economizer, water-cooled walls, and a superheater, which are connected sequentially via pipes. The economizer, water-cooled walls, and superheater are three key components of the boiler, each performing a different function to jointly ensure the boiler's efficient and safe operation. The economizer preheats the boiler feedwater, improving thermal efficiency. The water-cooled walls absorb radiant heat from the furnace, generating steam and protecting the furnace walls. The superheater heats saturated steam into superheated steam, improving steam quality. These three components are connected in series to provide heat supply.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) The amount of high-temperature and high-pressure steam coming out of the boiler tail is adjusted by using the steam replenishment valve to heat the secondary air heater using the boiler waste heat, thereby optimizing combustion efficiency; and heating the newly added final-stage high-pressure heater to increase the boiler feedwater temperature; thus saving boiler coal consumption and improving boiler thermal economy. When the generator is under high load and needs to generate more power, the steam replenishment valve is fully opened to increase the steam intake of the high-pressure cylinder, thereby increasing the generator's power generation. When the generator is under low load, the steam replenishment valve is opened to heat the boiler's secondary air and the newly added final-stage high-pressure heater, thereby improving the unit's thermal economy and achieving high fuel utilization.

[0018] (2) Enhanced frequency regulation and load response: By using the short-term rapid action of the steam injection valve, the unit’s primary frequency regulation response capability is enhanced, ensuring rapid adjustment of output under maximum load conditions and solving the problem of insufficient frequency regulation and regeneration capability.

[0019] (3) Improved overall energy efficiency: Improved overall thermal efficiency of the unit during deep peak shaving, and maintained high regulation flexibility during maximum load, taking into account both grid stability and economy. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of Embodiment 1 of the elastic regenerative system for deep peak shaving of a steam turbine with a steam injection valve according to the present invention;

[0021] Figure 2 This is a schematic diagram of Embodiment 2 of the elastic regenerative system for deep peak shaving of a steam turbine with a steam injection valve according to the present invention;

[0022] Figure 3 This is a schematic diagram of Embodiment 3 of the elastic regenerative system for deep peak shaving of a steam turbine with a steam injection valve according to the present invention;

[0023] Figure 4 This is a schematic diagram of Embodiment 4 of the elastic regenerative system for deep peak shaving of a steam turbine with a steam replenishment valve according to the present invention.

[0024] The markings in the diagram are explained below:

[0025] 1. Deaerator; 2. Pre-pump; 3. Feedwater pump; 4. Existing final stage high-pressure heater; 5. Boiler; 6. High-pressure cylinder; 7. Main steam valve; 8. Make-up steam valve; 9. Hot secondary air heater; 10. New final stage high-pressure heater; 11. Low-pressure cylinder; 12. Condenser; 13. Hot well; 14. Hot primary air heater; 15. Intermediate-pressure cylinder; 41. No. 1 high-pressure heater; 42. No. 2 high-pressure heater; 43. No. 3 high-pressure heater; 51. Economizer; 52. Water-cooled wall; 53. Superheater. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0027] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] Example 1

[0029] like Figure 1 The illustration shows a first embodiment of an elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to this utility model. It includes a deaerator 1, a pre-pump 2, a feedwater pump 3, an existing final-stage high-pressure heater 4, a boiler 5, and a high-pressure cylinder 6. The deaerator 1, pre-pump 2, and feedwater pump 3 are connected sequentially. The feedwater outlet of feedwater pump 3 is connected to the feedwater inlet of the existing final-stage high-pressure heater 4, and the feedwater outlet of the existing final-stage high-pressure heater 4 is connected to the feedwater inlet of the boiler 5. The steam outlet of the boiler 5 is connected to the steam inlet of the high-pressure cylinder 6, and the steam extraction port of the high-pressure cylinder 6 is connected to the steam inlet of the existing final-stage high-pressure heater 4. The system also includes a main steam valve 7, a make-up steam valve 8, and a hot secondary air heater 9. The main steam valve 7 and the make-up steam valve 8 are connected in parallel, and their inlets are both connected to the steam outlet of the boiler 5. The outlet of the main steam valve 7 is connected to the steam inlet of the high-pressure cylinder 6. The outlet of the make-up steam valve 8 and the steam extraction port of the high-pressure cylinder 6 are both connected to the steam inlet of the hot secondary air heater 9, and the steam outlet of the hot secondary air heater 9 is connected to the steam inlet of the boiler 5.

[0030] This utility model's flexible regenerative system for deep peak shaving of a steam turbine with a make-up steam valve utilizes the waste heat from the tail flue gas of boiler 5 via the make-up steam valve 8 to supply heat to the hot secondary air heater 9, increasing the temperature of the hot secondary air, optimizing combustion efficiency, and maintaining the hot secondary air temperature stably within the design threshold range, thereby reducing the cold source loss rate by 15%-25%. It can improve the unit's frequency regulation dynamic performance indicators, reduce overall power supply coal consumption, and effectively solve the coupling problem of increased terminal temperature difference and insufficient frequency regulation capacity in the regenerative system under deep peak shaving conditions. Specifically, by adjusting the high-pressure steam from the tail of boiler 5 through the main steam valve 7 and the make-up steam valve, the remaining high-temperature, high-pressure steam, after meeting the requirements of the high-pressure cylinder 6, directly enters the hot secondary air heater 9 to heat the hot secondary air. The heated hot secondary air then returns to boiler 5, realizing the secondary utilization of waste heat, further improving fuel utilization, saving energy, and increasing thermal efficiency.

[0031] As one embodiment of this utility model, it also includes a power generation controller, which is communicatively connected to the main steam valve 7 and the make-up steam valve 8. The power generation controller proportionally controls the high-temperature, high-pressure steam exiting from the tail end of the boiler 5 via the main steam valve 7 and the make-up steam valve 8, ensuring that while meeting the power generation requirements of the high-pressure cylinder 6, the remaining high-temperature, high-pressure steam directly enters the hot secondary air heater 9 and utilizes its waste heat to heat the hot secondary air, thus achieving automatic control.

[0032] Example 2

[0033] like Figure 2 The figure shown is a second embodiment of the elastic regenerative system under deep peak shaving of a steam turbine with a supplementary steam valve according to the present invention. This embodiment is similar to the first embodiment, except that it also includes a newly added final stage high-pressure heater 10. The steam outlet of the hot secondary air heater 9 is also connected to the steam inlet of the newly added final stage high-pressure heater 10. The feedwater outlet of the newly added final stage high-pressure heater 10 is connected to the feedwater inlet of the boiler 5. The feedwater inlet of the newly added final stage high-pressure heater 10 is connected to the feedwater outlet of the existing final stage high-pressure heater 4.

[0034] A new final-stage high-pressure heater 10 is added to the existing final-stage high-pressure heater 4 to increase the feedwater temperature of boiler 5. High-temperature and high-pressure steam from the secondary hot air heater 9 of boiler 5 enters the new final-stage high-pressure heater 10 to heat the feedwater, thereby increasing the feedwater temperature entering boiler 5. This allows for the consumption of less fuel and optimization of combustion efficiency while obtaining the same high-temperature and high-pressure steam, thus saving energy.

[0035] Example 3

[0036] like Figure 3The illustration shows a third embodiment of the elastic regenerative system for deep peak shaving of a steam turbine with a supplementary steam valve according to this utility model. This embodiment is similar to embodiment 2, except that the feedwater outlet of the feedwater pump 3 is also connected to the feedwater inlet of the deaerator 1. The connection between the feedwater pump 3 and the deaerator 1 removes dissolved oxygen and prevents system corrosion. Specifically, if insufficiently deoxygenated water enters the boiler 5, oxygen will react with metal components, forming pitting or ulcerative corrosion. Connecting to the deaerator 1 ensures that the water delivered by the feedwater pump 3 is deoxygenated, protecting the safe operation of downstream systems (such as the boiler 5 and the steam turbine). It also maintains the feedwater temperature and improves thermal efficiency. Specifically, the deaerator 1 typically uses steam extracted from the steam turbine to heat the feedwater, raising the water temperature to the saturation temperature (approximately 104℃~160℃, depending on pressure). This not only facilitates deoxygenation but also reduces the energy consumption of the boiler 5 and improves the thermal cycle efficiency. By connecting to deaerator 1, the power generation system can recover and utilize the heat from low-grade steam (such as turbine extraction steam), reducing cold source losses and conforming to the principle of "cascade utilization" in thermal systems. It also ensures the safe operation of feedwater pump 3 and achieves system pressure and process integration.

[0037] As one embodiment of this utility model, it also includes a primary air heater 14. The steam extraction port of the high-pressure cylinder 6 is connected to the steam inlet of the primary air heater 14, and the steam outlet of the primary air heater 14 is connected to the steam inlet of the existing final-stage high-pressure heater 4. After the high-pressure cylinder 6 generates electricity using high-temperature and high-pressure steam, the remaining gas enters the primary air heater 14 to heat the primary air, which is also a form of waste heat reuse.

[0038] As one embodiment of this utility model, it also includes a medium-pressure cylinder 15. The steam extraction port of the high-pressure cylinder 6 is connected to the steam inlet of the medium-pressure cylinder 15, and the steam outlet of the medium-pressure cylinder 15 is connected to the steam inlet of the hot primary air heater 14. The medium-pressure cylinder 15 is used to reduce the pressure of the high-temperature and high-pressure steam, and the reduced-pressure steam then enters the hot primary air heater 14.

[0039] In one embodiment of this utility model, the existing final-stage high-pressure heater 4 includes a No. 1 high-pressure heater 41, a No. 2 high-pressure heater 42, and a No. 3 high-pressure heater 43 connected sequentially by pipes. The feedwater outlet of the No. 1 high-pressure heater 41 is connected to the inlet and outlet of the newly added final-stage high-pressure heater 10, and the feedwater inlet of the No. 3 high-pressure heater 43 is connected to the feedwater outlet of the feedwater pump 3. The three high-pressure heaters are used to increase the feedwater temperature, ensuring that the feedwater entering the boiler 5 meets the required temperature. Within the understanding of those skilled in the art, the number of high-pressure heaters includes, but is not limited to, three; more or fewer high-pressure heaters can be installed according to user needs.

[0040] In one embodiment of this utility model, the boiler 5 includes an economizer 51, a water-cooled wall 52, and a superheater 53, which are connected sequentially via pipes. The economizer 51, water-cooled wall 52, and superheater 53 are three key components of the boiler 5, each performing different functions to jointly ensure the efficient and safe operation of the boiler 5. The economizer 51 preheats the boiler 5 feedwater, improving thermal efficiency. The water-cooled wall 52 absorbs radiant heat from the furnace, generating steam and protecting the furnace walls. The superheater 53 heats saturated steam into superheated steam, improving steam quality. These three components are connected in series to provide heat supply.

[0041] Example 4

[0042] like Figure 4 The above is a fourth embodiment of the elastic regenerative system for deep peak shaving of a steam turbine with a steam replenishment valve according to the present invention. This embodiment is similar to embodiment 3, except that it also includes a low-pressure cylinder 11, a condenser 12, and a hot well 13 connected in sequence. The feedwater inlet of the newly added final stage high-pressure heater 10 is also connected to the condenser 12, and the hot well 13 is connected to the deaerator 1.

[0043] The low-pressure cylinder 11, condenser 12, and hot well 13 form an emergency drainage path, while the path from the feedwater inlet of the newly added final-stage high-pressure heater 10 to the feedwater outlet of the existing final-stage high-pressure heater is a normal drainage path. Depending on the situation, the feedwater of the newly added final-stage high-pressure heater 10 enters different paths.

[0044] As one embodiment of this utility model, a water level regulating valve is also provided in the newly added final stage high-pressure heater 10. The water level regulating valve is used to monitor the water level in the newly added final stage high-pressure heater 10 to determine whether it is in a normal drainage state or an emergency drainage state, thereby selecting to control the feedwater flow direction, whether it enters the existing final stage high-pressure heater 4 through the normal drainage path or enters the condenser 12 through the emergency drainage path.

[0045] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A flexible regenerative system for deep peak shaving of a steam turbine with a make-up steam valve, comprising a deaerator (1), a booster pump (2), a feedwater pump (3), an existing final-stage high-pressure heater (4), a boiler (5), and a high-pressure cylinder (6), wherein, The deaerator (1), pre-pump (2), and feedwater pump (3) are connected in sequence. The feedwater outlet of the feedwater pump (3) is connected to the feedwater inlet of the existing final-stage high-pressure heater (4). The feedwater outlet of the existing final-stage high-pressure heater (4) is connected to the feedwater inlet of the boiler (5). The steam outlet of the boiler (5) is connected to the steam inlet of the high-pressure cylinder (6). The steam extraction port of the high-pressure cylinder (6) is connected to the steam inlet of the existing final-stage high-pressure heater (4). The system is characterized by further including a main steam valve. (7) Steam replenishment valve (8) and hot secondary air heater (9). The main steam valve (7) and the steam replenishment valve (8) are connected in parallel, and the inlets of both are connected to the steam outlet of the boiler (5). The outlet of the main steam valve (7) is connected to the steam inlet of the high-pressure cylinder (6). The outlet of the steam replenishment valve (8) and the steam extraction port of the high-pressure cylinder (6) are both connected to the steam inlet of the hot secondary air heater (9). The steam outlet of the hot secondary air heater (9) is connected to the steam inlet of the boiler (5).

2. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 1, characterized in that, It also includes a power generation controller, which is communicatively connected to the main steam valve (7) and the supplementary steam valve (8).

3. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 1 or 2, characterized in that, It also includes a newly added final stage high-pressure heater (10), the steam outlet of the hot secondary air heater (9) is also connected to the steam inlet of the newly added final stage high-pressure heater (10), the water outlet of the newly added final stage high-pressure heater (10) is connected to the water inlet of the boiler (5), and the water inlet of the newly added final stage high-pressure heater (10) is connected to the water outlet of the existing final stage high-pressure heater (4).

4. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 3, characterized in that, It also includes a low-pressure cylinder (11), a condenser (12), and a hot well (13) connected in sequence. The feedwater inlet of the newly added final stage high-pressure heater (10) is also connected to the condenser (12), and the hot well (13) is connected to the deaerator (1).

5. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 4, characterized in that, The newly added final stage high-pressure heater (10) is also equipped with a water level regulating valve.

6. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 1, characterized in that, The water outlet of the water pump (3) is also connected to the water inlet of the deaerator (1).

7. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 1, characterized in that, It also includes a primary air heater (14), the steam extraction port of the high pressure cylinder (6) is connected to the steam inlet of the primary air heater (14), and the steam outlet of the primary air heater (14) is connected to the steam inlet of the existing final stage high pressure heater (4).

8. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 7, characterized in that, It also includes a medium-pressure cylinder (15), the steam extraction port of the high-pressure cylinder (6) is connected to the steam inlet of the medium-pressure cylinder (15), and the steam outlet of the medium-pressure cylinder (15) is connected to the steam inlet of the hot primary air heater (14).

9. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 3, characterized in that, The existing final stage high-pressure heater (4) includes a No. 1 high-pressure heater (41), a No. 2 high-pressure heater (42), and a No. 3 high-pressure heater (43) connected in sequence by a pipeline. The water outlet of the No. 1 high-pressure heater (41) is connected to the inlet and outlet of the newly added final stage high-pressure heater (10), and the water inlet of the No. 3 high-pressure heater (43) is connected to the water outlet of the water pump (3).

10. The elastic regenerative system for deep peak shaving of a steam turbine with a make-up steam valve according to claim 1, characterized in that, The boiler (5) includes an economizer (51), a water-cooled wall (52), and a superheater (53), which are connected in sequence by pipes.

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