Thermal power generating unit peak regulation system and method based on steam heat accumulator

Abstract

The invention relates to a thermal power generating unit peak shaving system and method based on a steam heat accumulator. The thermal power generating unit peak shaving system comprises a steam turbine, a boiler conveying steam to the steam turbine and a water supply assembly conveying water to the boiler to form steam. The boiler comprises a main steam pipe and a reheat steam pipe; the water supply assembly comprises a water conveying assembly and a heating assembly, and the heating assembly is used for heating water conveyed in the water conveying assembly through steam extraction of the steam turbine; the peak regulation system of the thermal power generating unit further comprises a steam heat storage system, the steam heat storage system comprises a steam heat accumulator, the steam input end of the steam heat accumulator is connected with the main steam pipe, the steam output end of the steam heat accumulator is at least connected with the heating assembly, and the peak regulation system of the thermal power generating unit has the advantage of meeting rapid peak regulation of the unit.

Description

Technical Field

[0001] The present invention relates to the technical field of peak load regulation of thermal power units, and in particular to a peak load regulation system and a peak load regulation method of a thermal power unit based on a steam heat accumulator. Background Art

[0002] Due to the obvious uncertainty and volatility of new energy, and thermal power is still the main power source in my country, in order to ensure the power balance of the power system, improving the peak-shaving capacity of thermal power units is an inevitable requirement for achieving a higher proportion of new energy access.

[0003] However, the current peak-shaving rate of thermal power units is slow, and transformation technologies represented by molten salt heat storage and electrochemical energy storage face the problem of high transformation costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a peak-shaving system and a peak-shaving method for a thermal power unit based on a steam heat accumulator.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A peak-shaving system for a thermal power unit based on a steam accumulator comprises a steam turbine, a boiler for conveying steam to the steam turbine, and a water supply assembly for conveying water to the boiler to form steam; the boiler comprises a main steam pipe and a reheat steam pipe; the water supply assembly comprises a water supply assembly and a heating assembly, the heating assembly being used to heat the water conveyed in the water supply assembly by utilizing the extraction steam of the steam turbine; the peak-shaving system for a thermal power unit further comprises a steam heat storage system, the steam heat storage system comprises a steam accumulator, the steam input end of the steam accumulator is connected to the main steam pipe, and the steam output end of the steam accumulator is at least connected to the heating assembly.

[0007] Preferably, the steam heat storage system further comprises a first pipeline assembly; the input end of the first pipeline assembly is connected to the output end of the steam heat accumulator, and the output end of the first pipeline assembly is connected to the reheat steam pipe.

[0008] Preferably, the steam thermal storage system further comprises a second pipeline assembly; the input end of the second pipeline assembly is connected to the output end of the steam thermal storage device, and the output end of the second pipeline assembly is connected to the heating assembly.

[0009] Preferably, the heating assembly includes a plurality of high-pressure heaters, which are connected in sequence from upstream to downstream of the water supply assembly; the second pipeline assembly includes a second steam pipe, a second check valve, a third steam pipe and a first regulating valve; the third steam pipe is arranged in a one-to-one correspondence with the high-pressure heater; the output end of the steam accumulator, the second steam pipe, the third steam pipe and the high-pressure heater are connected in sequence; the second check valve is arranged on the second steam pipe, and the first regulating valve is arranged on the third steam pipe.

[0010] Preferably, the steam heat storage system also includes a third pipeline assembly; the third pipeline assembly includes a fourth steam pipe, a temperature and pressure reducing device and a third check valve; the output end of the main steam pipe, the fourth steam pipe, and the input end of the steam heat accumulator are connected in sequence; the third check valve and the temperature and pressure reducing device are both located on the fourth steam pipe.

[0011] Preferably, the steam turbine includes a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder; the steam input end of the high-pressure cylinder is connected to the output end of the main steam pipe, the steam input end of the intermediate-pressure cylinder is connected to the output end of the reheat steam pipe, and the output end of the intermediate-pressure cylinder is connected to the input end of the low-pressure cylinder; the heating assembly includes a plurality of high-pressure heaters, and the plurality of high-pressure heaters are connected in sequence from the upstream to the downstream direction of the water supply assembly; the steam extraction ends of the high-pressure cylinder and the intermediate-pressure cylinder are both connected to at least one high-pressure heater, and the high-pressure heater connected to the high-pressure cylinder is located downstream of the high-pressure heater connected to the intermediate-pressure cylinder.

[0012] Preferably, the high-pressure heater includes a first high-pressure heater, a second high-pressure heater and a third high-pressure heater; along the upstream to downstream direction of the water supply component, the first high-pressure heater, the second high-pressure heater and the third high-pressure heater are connected in sequence; the first high-pressure heater is connected to the extraction end of the intermediate-pressure cylinder; the second high-pressure heater is connected to the first extraction end of the high-pressure cylinder; the third high-pressure heater is connected to the second extraction end of the high-pressure cylinder, and the extraction temperature of the second extraction end is greater than the extraction temperature of the first extraction end.

[0013] A peak-shaving method based on the peak-shaving system of the thermal power unit described above comprises the following steps:

[0014] When the unit is under load, the main steam of the unit is transported to the steam accumulator, and the main steam is converted into high-pressure water and stored in the steam accumulator to reduce the amount of steam entering the steam turbine to perform work;

[0015] When the unit increases its load, the high-pressure water in the steam accumulator is converted into steam to replace at least part of the steam extraction of the steam turbine and supply the water supply component to preheat the water sent to the boiler and increase the amount of steam entering the steam turbine to perform work.

[0016] Preferably, the following steps are also included: when the unit increases its load, the high-pressure water in the steam accumulator is converted into steam, and the steam is supplied together with the exhaust steam of the high-pressure cylinder to the reheat steam pipe of the boiler to increase the amount of steam entering the steam turbine to perform work.

[0017] Preferably, the following steps are also included: when the unit increases its load, the steam generated by the steam accumulator first replaces the steam extracted from the high-pressure cylinder of the steam turbine by the water supply assembly, and then the steam generated by the steam accumulator replaces the steam extracted from the high-pressure cylinder of the steam turbine by the reheat steam pipe; finally, the steam generated by the steam accumulator replaces the steam extracted from the intermediate-pressure cylinder of the steam turbine.

[0018] Preferably, the following steps are also included: when the unit reduces load, the steam flow rate entering the steam accumulator is changed to change the rate at which the unit reduces load; when the unit increases load, the steam flow rate delivered from the steam accumulator to the heating assembly and the reheat steam pipe is changed to change the rate at which the unit increases load.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The above technical solution provides a peak-shaving system for a thermal power unit based on a steam accumulator. By connecting the steam input end of the steam accumulator to the main steam pipe, and the steam output end of the steam accumulator to at least the heating component, when the unit has a load reduction demand, the high-temperature and high-pressure hot steam output by the main steam pipe can be transported to the steam accumulator of the steam accumulator system, so that the main steam is converted into high-pressure water and stored in the steam accumulator, which can not only quickly reduce the amount of steam supplied to the high-pressure cylinder of the steam turbine, thereby quickly reducing the output power of the steam turbine, but also store the energy of the high-temperature and high-pressure steam output by the main steam pipe to avoid energy waste. At the same time, the energy stored in the steam accumulator of the steam accumulator of the steam accumulator system can be converted into steam through high-pressure water to replace at least part of the steam extraction of the steam turbine to supply the water supply component when the unit has a load increase demand, so as to preheat the water sent to the boiler, which can not only meet the water preheating demand, but also reduce the steam extraction of the steam turbine, thereby quickly increasing the output power of the steam turbine. Correspondingly, the peak-shaving method based on the above-mentioned peak-shaving system for thermal power units can achieve rapid peak-shaving of thermal power units. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of an example provided by the present invention

[0023] Description of reference numerals:

[0024] 1. Steam turbine; 11. High-pressure cylinder; 12. Medium-pressure cylinder; 13. Low-pressure cylinder; 2. Boiler; 21. Main steam pipe; 22. Reheat steam pipe; 3. Feedwater assembly; 31. Water delivery assembly; 311. Delivery pipe; 312. Condenser; 313. Condensate pump; 314. Deaerator; 315. Feedwater pump; 32. Heating assembly; 321. First high-pressure heater; 322. Second high-pressure heater; 323. Third high-pressure heater; 324. Low-pressure heater; 4. Steam thermal storage system ; 40. Steam accumulator; 41. First pipeline assembly; 411. First steam pipe; 412. First check valve; 413. Fourth regulating valve; 42. Second pipeline assembly; 421. Second steam pipe; 422. Second check valve; 423. Third steam pipe; 424. First regulating valve; 43. Third pipeline assembly; 431. Fourth steam pipe; 432. Temperature and pressure reducing device; 433. Third check valve; 434. Second regulating valve; 5. Fifth steam pipe; 51. Third regulating valve. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1 An embodiment of the present invention provides a peak-shaving system for a thermal power unit based on a steam heat accumulator, comprising a steam turbine 1, a boiler 2 and a water supply component 3, wherein the boiler 2 is used to transport steam to the steam turbine 1 to drive the steam turbine 1 to generate power, and the water supply component 3 is used to transport water to the boiler 2 to form steam.

[0029] Specifically, the steam turbine 1 includes a high-pressure cylinder 11, an intermediate-pressure cylinder 12 and a low-pressure cylinder 13, and the boiler 2 includes a main steam pipe 21 and a reheat steam pipe 22. Among them, the main steam pipe 21 provides high-temperature and high-pressure hot steam, which is mainly used for the high-pressure cylinder 11 of the steam turbine 1; the reheat steam pipe 22 provides high-temperature and high-pressure hot steam that is heated for the second time, which is mainly used to supply the intermediate-pressure cylinder 12 to meet the needs of rapid peak regulation. The water supply component 3 includes a water supply component 31 and a heating component 32. The heating component 32 is used to use the steam extraction of the steam turbine 1 to heat the water transported in the water supply component 31, which can not only realize the peak regulation of the unit, but also preheat the water entering the boiler 2.

[0030] See also Figure 1 In order to further meet the rapid peak-shaving requirements of the unit, in this embodiment, the peak-shaving system of the thermal power unit further includes a steam heat storage system 4, which includes a steam heat storage tank 40, the steam input end of the steam heat storage tank 40 is connected to the main steam pipe 21, and the steam output end of the steam heat storage tank 40 is at least connected to the heating assembly 32. Through this solution, when the unit is deloaded, the high-temperature and high-pressure hot steam output by the main steam pipe 21 can be transported to the steam heat storage tank 40 of the steam heat storage system 4, so that the main steam is converted into high-pressure water and stored in the steam heat storage tank 40, which can not only quickly reduce the amount of steam supplied to the high-pressure cylinder 11 of the steam turbine 1, thereby quickly reducing the output power of the steam turbine 1, but also store the energy of the high-temperature and high-pressure steam output by the main steam pipe 21 to avoid energy waste. At the same time, the energy stored in the steam accumulator 40 of the steam heat storage system 4 can be converted into steam through high-pressure water to replace at least part of the steam extraction of the steam turbine 1 to supply the water supply component 3 when the unit has a load increase demand, so as to preheat the water sent to the boiler 2. This can not only meet the water preheating demand, but also reduce the steam extraction amount of the steam turbine 1, thereby quickly increasing the output power of the steam turbine 1.

[0031] Furthermore, in order to quickly provide steam to the intermediate pressure cylinder 12 and further improve the output power of the intermediate pressure cylinder 12, in this embodiment, the steam heat storage system 4 also includes a first pipeline assembly 41; the input end of the first pipeline assembly 41 is connected to the output end of the steam accumulator 40, and the output end of the first pipeline assembly 41 is connected to the reheat steam pipe 22, so that the steam generated by the steam accumulator 40 can be transported to the reheat steam pipe 22 for heating and then supplied to the intermediate pressure cylinder 12, so as to improve the working capacity of the entire steam turbine 1.

[0032] Furthermore, the first pipeline assembly 41 includes a first steam pipe 411 and a first check valve 412. One end of the first steam pipe 411 is connected to the steam accumulator 40, and the other end is connected to the reheat steam pipe 22. The first check valve 412 is arranged on the first steam pipe 411 to prevent the steam in the reheat steam pipe 22 from flowing back into the steam accumulator 40.

[0033] See also Figure 1 , in order to realize the steam generated by the steam accumulator 40 being transported to the heating component 32 to heat the water transported in the water delivery component 31. The steam thermal storage system 4 also includes a second pipeline component 42; the input end of the second pipeline component 42 is connected to the output end of the steam accumulator 40, and the output end is connected to the heating component 32.

[0034] Specifically, in this embodiment, the heating assembly 32 includes a plurality of high-pressure heaters, which are sequentially connected from upstream to downstream of the water supply assembly 31 to increase the heat exchange effect. The second pipeline assembly 42 includes a second steam pipe 421, a second check valve 422, a third steam pipe 423 and a first regulating valve 424; the third steam pipe 423 is arranged in a one-to-one correspondence with the high-pressure heater; the output end of the steam accumulator 40, the second steam pipe 421, the third steam pipe 423, and the high-pressure heater are sequentially connected; the second check valve 422 is arranged on the second steam pipe 421, and the first regulating valve 424 is arranged on the third steam pipe 423; thereby, the first regulating valve 424 can dynamically adjust the amount of steam delivered to different high-pressure heaters according to actual working conditions.

[0035] The steam output by the main steam pipe 21 of the boiler 2 is high-temperature and high-pressure steam. In order to convert the main steam (i.e., the steam output by the main steam pipe 21) into high-pressure water; in this embodiment, the steam thermal storage system 4 also includes a third pipeline assembly 43; the third pipeline assembly 43 includes a fourth steam pipe 431, a temperature reducer and pressure reducer 432 and a third check valve 433; the output end of the main steam pipe 21, the fourth steam pipe 431, and the input end of the steam thermal storage device 40 are connected in sequence; the third check valve 433 and the temperature reducer and pressure reducer 432 are both located on the fourth steam pipe 431, and the third check valve 433 is used to prevent steam backflow, and the temperature reducer and pressure reducer 432 is used to reduce the temperature and pressure of the main steam, so as to facilitate the main steam to be converted into high-pressure water and stored in the steam thermal storage device.

[0036] Furthermore, in order to control the amount of steam delivered to the high-pressure cylinder 11 of the steam turbine 1 and the steam accumulator 40 , in this embodiment, the third pipeline assembly 43 further includes a second regulating valve 434 , which is disposed on the fourth steam pipe 431 .

[0037] In order to increase the heat exchange effect, the heating component 32 includes a plurality of high-pressure heaters, which are sequentially connected from the upstream to the downstream direction of the water supply component 31; the steam extraction ends of the high-pressure cylinder 11 and the medium-pressure cylinder 12 are each connected to a high-pressure heater, and the high-pressure heater connected to the high-pressure cylinder 11 is located downstream of the high-pressure heater connected to the medium-pressure cylinder 12, so as to achieve step-by-step heat exchange of water and improve the heat exchange efficiency. Of course, in other embodiments, the steam extraction ends of the high-pressure cylinder 11 and the medium-pressure cylinder 12 can also be connected to multiple high-pressure heaters to ensure that the steam supplied to the high-pressure heaters increases sequentially from the upstream to the downstream direction of the water supply component 31.

[0038] See also Figure 1 In this embodiment, the high-pressure heater includes a first high-pressure heater 321, a second high-pressure heater 322 and a third high-pressure heater 323; along the upstream to downstream direction of the water supply component 31, the first high-pressure heater 321, the second high-pressure heater 322 and the third high-pressure heater 323 are connected in sequence. Among them, the second high-pressure heater 322 is connected to the first steam extraction end of the high-pressure cylinder 11; the third high-pressure heater 323 is connected to the second steam extraction end of the high-pressure cylinder 11, and the steam extraction temperature of the second steam extraction end is greater than the steam extraction temperature of the first steam extraction end. The first high-pressure heater 321 is connected to the steam extraction end of the medium-pressure cylinder 12; it can be known that the medium-pressure cylinder 12 also has two steam extraction ends, one of which is connected to the first high-pressure heater 321, and the other is connected to the input end of the deaerator 314; the output end of the medium-pressure cylinder 12 is connected to the input end of the low-pressure cylinder 13. In addition, in order to achieve flow control, the corresponding connecting pipeline can be correspondingly provided with a regulating valve.

[0039] Furthermore, the first exhaust end of the high-pressure cylinder 11 may also be connected to the reheat steam pipe 22 via a pipeline.

[0040] Furthermore, in this embodiment, the heating assembly 32 further includes a low-pressure heater 324, and the steam input end of the low-pressure heater 324 is connected to one of the steam extraction ends of the low-pressure cylinder 13 through the fifth steam pipe 5, so as to heat the water transported in the water supply assembly 31 by using the steam extraction of the low-pressure cylinder 13. The third regulating valve 51 can be provided on the fifth steam pipe 5 to further adjust the steam extraction amount of the low-pressure heater 324 from the low-pressure cylinder 13.

[0041] See also Figure 1In order to reuse the exhaust steam from the low-pressure cylinder 13 , in this embodiment, the water delivery assembly 31 includes a delivery pipe 311 , a condenser 312 , a condensate pump 313 , a deaerator 314 and a water feed pump 315 .

[0042] It can be known that there are multiple delivery pipes 311, and from the exhaust end of the low-pressure cylinder 13 to the direction of the boiler 2, the multiple delivery pipes 311 are connected in sequence to the exhaust end of the low-pressure cylinder 13, the condenser 312, the condensate pump 313, the low-pressure heater 324, the deaerator 314, the feed water pump 315, the first high-pressure heater 321, the second high-pressure heater 322, the third high-pressure heater 323 and the boiler 2 to form a water supply path for the boiler 2.

[0043] In summary, the actual application of this system is as follows:

[0044] The steam accumulator 40 stores and releases heat energy through the mutual conversion of steam and high-pressure water. Specifically:

[0045] When the unit needs to reduce the load quickly, the second regulating valve 434 is adjusted to open, and the steam (main steam) generated by the main steam pipe 21 of the boiler 2 is divided into two paths, one of which enters the high-pressure cylinder 11 of the steam turbine 1 to perform work, and the other enters the temperature and pressure reducer 432 through the third check valve 433, and then the steam is cooled and reduced in pressure to a preset temperature and a preset pressure, and then transported to the steam accumulator 40 for storage. By quickly reducing the amount of steam entering the high-pressure cylinder 11 of the steam turbine 1, the output power of the steam turbine 1 can be quickly reduced.

[0046] When the unit needs to increase the load quickly, the high-pressure water in the steam accumulator 40 is converted into steam, and the formed steam is also divided into two paths, one of which enters the reheat steam pipe 22 through the first steam pipe 411 and the first check valve 412 to be heated to superheated steam, and then is transported to the intermediate pressure cylinder 12 of the steam turbine 1 to do work; the other path passes through the second steam pipe 421, the second check valve 422, the third steam pipe 423, and the first regulating valve 424 in sequence to enter the corresponding high-pressure heater to heat the water transported in the transport pipe 311. Under the joint action of the two paths of steam, the steam volume of the high-pressure cylinder 11 and the intermediate pressure cylinder 12 of the steam turbine 1 is rapidly increased, thereby rapidly increasing the output power of the steam turbine 1.

[0047] It is worth noting that the water transported in the delivery pipe 311 may come from exhaust steam condensation of the low-pressure cylinder 13 or from external water supply.

[0048] Based on the above-mentioned peak-shaving system of thermal power units, this embodiment further provides a peak-shaving method, which specifically includes the following steps:

[0049] When the unit is under load, the main steam of the unit is transported to the steam accumulator 40, and the main steam is converted into high-pressure water and stored in the steam accumulator 40, so as to reduce the amount of steam entering the steam turbine 1 to perform work;

[0050] When the unit is loaded, the high-pressure water in the steam accumulator 40 is converted into steam to replace at least part of the steam extraction of the steam turbine 1 and supplied to the water supply assembly 3, so as to preheat the water sent to the boiler 2 and increase the amount of steam entering the steam turbine 1 to do work. Specifically, the high-pressure water in the steam accumulator 40 is converted into steam to replace the steam extraction of the water supply assembly 3 from the high-pressure cylinder 11 of the steam turbine 1, and can also replace the steam extraction of the heating assembly 32 from the low-pressure cylinder 13 of the steam turbine 1.

[0051] Furthermore, the method further comprises the following steps:

[0052] When the unit increases its load, the high-pressure water in the steam accumulator 40 is converted into steam, and the steam is supplied together with the exhaust steam from the high-pressure cylinder 11 to the reheat steam pipe 22 of the boiler 2 to increase the amount of steam entering the steam turbine 1 to perform work.

[0053] Specifically, when the unit increases its load, the steam generated by the steam accumulator 40 first replaces the steam extracted from the high-pressure cylinder 11 of the steam turbine 1 by the water supply assembly 3, and then the steam generated by the steam accumulator 40 replaces the steam extracted from the high-pressure cylinder 11 of the steam turbine 1 by the reheat steam pipe 22; finally, the steam generated by the steam accumulator 40 replaces the steam extracted from the intermediate-pressure cylinder 12 of the steam turbine 1.

[0054] The method further comprises the following steps:

[0055] When the unit is de-loaded, the steam flow rate entering the steam accumulator 40 is changed to change the rate at which the unit is de-loaded. Specifically, the steam flow rate entering the steam accumulator 40 can be changed by adjusting the opening of the second regulating valve 434.

[0056] When the unit increases the load, the steam flow rate delivered from the steam accumulator 40 to the heating assembly 32 and the reheat steam pipe 22 is changed to change the rate at which the unit increases the load. Specifically, the steam flow rate delivered from the steam accumulator 40 to the heating assembly 32 and the reheat steam pipe 22 can be changed by adjusting the opening of the first regulating valve 424 and the fourth regulating valve 413.

[0057] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A peak load regulation system for a thermal power unit based on a steam heat accumulator, comprising a steam turbine (1), a boiler (2) for delivering steam to the steam turbine (1), and a water supply component (3) for delivering water to the boiler (2) to form steam; characterized in that: The boiler (2) comprises a main steam pipe (21) and a reheat steam pipe (22); The water supply component (3) comprises a water supply component (31) and a heating component (32), wherein the heating component (32) is used to heat the water transported in the water supply component (31) by using the extracted steam of the steam turbine (1); The thermal power unit peak load regulation system further comprises a steam heat storage system (4), wherein the steam heat storage system (4) comprises a steam heat storage tank (40), wherein the steam input end of the steam heat storage tank (40) is connected to the main steam pipe (21), and the steam output end of the steam heat storage tank (40) is connected to at least the heating component (32).

2. A peak load regulation system for thermal power units based on steam heat accumulator according to claim 1, characterized in that: The steam thermal storage system (4) further comprises a first pipeline assembly (41); The input end of the first pipeline assembly (41) is connected to the output end of the steam accumulator (40), and the output end of the first pipeline assembly (41) is connected to the reheat steam pipe (22).

3. A peak load regulation system for thermal power units based on steam heat accumulator according to claim 1, characterized in that: The steam thermal storage system (4) further comprises a second pipeline assembly (42); The input end of the second pipeline component (42) is connected to the output end of the steam accumulator (40), and the output end of the second pipeline component (42) is connected to the heating component (32).

4. A peak load regulation system for thermal power units based on steam heat accumulator according to claim 3, characterized in that: The heating component (32) comprises a plurality of high-pressure heaters, and the plurality of high-pressure heaters are connected in sequence from upstream to downstream of the water supply component (31); The second pipeline assembly (42) comprises a second steam pipe (421), a second check valve (422), a third steam pipe (423) and a first regulating valve (424); The third steam pipe (423) is arranged in one-to-one correspondence with the high-pressure heater; The output end of the steam accumulator (40), the second steam pipe (421), the third steam pipe (423), and the high-pressure heater are connected in sequence; The second check valve (422) is arranged on the second steam pipe (421), and the first regulating valve (424) is arranged on the third steam pipe (423).

5. A peak load regulation system for thermal power units based on steam heat accumulator according to claim 1, characterized in that: The steam thermal storage system (4) further comprises a third pipeline assembly (43); The third pipeline assembly (43) comprises a fourth steam pipe (431), a temperature and pressure reducing device (432) and a third check valve (433); The output end of the main steam pipe, the fourth steam pipe (431), and the input end of the steam accumulator (40) are connected in sequence; The third check valve (433) and the temperature and pressure reducing device (432) are both located on the fourth steam pipe (431).

6. A peak load regulation system for thermal power units based on steam heat accumulator according to any one of claims 1 to 5, characterized in that: The steam turbine (1) comprises a high-pressure cylinder (11), a medium-pressure cylinder (12) and a low-pressure cylinder (13); The steam input end of the high-pressure cylinder (11) is connected to the output end of the main steam pipe (21), the steam input end of the intermediate-pressure cylinder (12) is connected to the output end of the reheat steam pipe (22), and the output end of the intermediate-pressure cylinder (12) is connected to the input end of the low-pressure cylinder (13); The heating component (32) comprises a plurality of high-pressure heaters, and the plurality of high-pressure heaters are connected in sequence from upstream to downstream of the water supply component (31); The steam extraction ends of the high-pressure cylinder (11) and the medium-pressure cylinder (12) are both connected to at least one of the high-pressure heaters, and the high-pressure heater connected to the high-pressure cylinder (11) is located downstream of the high-pressure heater connected to the medium-pressure cylinder (12).

7. A peak load regulation system for thermal power units based on steam accumulator according to claim 6, characterized in that: The high-pressure heater includes a first high-pressure heater (321), a second high-pressure heater (322) and a third high-pressure heater (323); Along the upstream to downstream direction of the water supply component (31), the first high-pressure heater (321), the second high-pressure heater (322) and the third high-pressure heater (323) are connected in sequence; The first high-pressure heater (321) is connected to the steam extraction end of the medium-pressure cylinder (12); The second high-pressure heater (322) is connected to the first steam extraction end of the high-pressure cylinder (11); The third high-pressure heater (323) is connected to a second steam extraction end of the high-pressure cylinder (11), and the steam extraction temperature of the second steam extraction end is greater than the steam extraction temperature of the first steam extraction end.

8. A peak-shaving method for a thermal power plant peak-shaving system according to any one of claims 1 to 7, characterized in that: The following steps are involved: When the unit is deloaded, the main steam of the unit is transported to a steam accumulator (40), and the main steam is converted into high-pressure water and stored in the steam accumulator (40), so as to reduce the amount of steam entering the steam turbine (1) to perform work; When the load of the unit is increased, the high-pressure water in the steam accumulator (40) is converted into steam to replace at least part of the extraction steam of the steam turbine (1) and supply the water supply component (3), so as to preheat the water sent to the boiler (2) and increase the amount of steam entering the steam turbine (1) to perform work.

9. The peak load regulation method according to claim 8, characterized in that: The following steps are also included: When the load of the unit is increased, the high-pressure water in the steam accumulator (40) is converted into steam, and the steam is supplied together with the exhaust steam of the high-pressure cylinder (11) to the reheat steam pipe (22) of the boiler (2) to increase the amount of steam entering the steam turbine (1) to perform work.

10. The peak load regulation method according to claim 9, characterized in that: The following steps are also included: When the load of the unit is increased, the steam generated by the steam accumulator (40) first replaces the steam extracted from the high-pressure cylinder (11) of the steam turbine (1) by the water supply assembly (3), and then the steam generated by the steam accumulator (40) replaces the steam extracted from the high-pressure cylinder (11) of the steam turbine (1) by the reheat steam pipe (22); finally, the steam generated by the steam accumulator (40) replaces the steam extracted from the intermediate-pressure cylinder (12) of the steam turbine (1).

11. The peak load regulation method according to claim 8, characterized in that: The following steps are also included: When the unit is de-loaded, the steam flow rate entering the steam accumulator (40) is changed to change the rate at which the unit is de-loaded; When the unit increases its load, the steam flow rate transmitted from the steam accumulator (40) to the heating component (32) and the reheat steam pipe (22) is changed to change the rate at which the unit increases its load.

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