Peak shaving system and method for coupling phase change spherical capsule stacking tank of coal-fired unit

Abstract

The invention discloses a peak shaving system and method for coupling a coal-fired unit with a phase change spherical capsule stacking tank. In the system, a boiler system comprises a superheater and a reheater in the steam flowing direction; the steam turbine generator system comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a generator in the rotating shaft direction. The steam circulating system comprises a condenser, a water pump main path adjusting valve, a condensate pump, a low-pressure heater, a deaerator, a first water feeding pump adjusting valve, a first water feeding pump and a high-pressure heater in the steam flowing direction. The phase-change spherical capsule stacking system comprises a low-temperature phase-change spherical capsule stacking tank storage device, a high-temperature phase-change spherical capsule stacking tank storage device, a steam source device, a first phase-change spherical capsule stacking tank, a second phase-change spherical capsule stacking tank and third to N-2 phase-change spherical capsule stacking tanks, wherein the first phase-change spherical capsule stacking tank, the second phase-change spherical capsule stacking tank and the third to N-2 phase-change spherical capsule stacking tanks are used for packaging phase-change materials in spherical capsules; an (N-1) th phase change spherical capsule stacking tank and an Nth phase change spherical capsule stacking tank.

Description

Technical Field

[0001] This invention relates to the field of peak shaving technology for coal-fired power units, and in particular to a peak shaving system and method for a coal-fired power unit coupled with a phase change spherical capsule stacking tank. Background Technology

[0002] Coal-fired power units are gradually shifting from being the primary source of electricity to a supporting and regulating power source. Although the installed capacity of renewable energy sources such as solar and wind power is rapidly increasing, their inherent volatility, intermittency, and unpredictability pose significant challenges to the stable and safe operation of the power grid. Therefore, improving the operational flexibility of coal-fired power generating units is crucial for maintaining the safe and stable operation of the power grid.

[0003] Phase change thermal energy storage (PCE) technology stores excess heat in a PCE system, enabling coal-fired power units to more flexibly adjust power output and achieve rapid load regulation and peak shaving. This not only improves the response speed and stability of coal-fired power units but also helps optimize the operation of the power generation system and reduce energy production costs. Currently, there are no methods for direct heat exchange between steam or water and the thermal energy storage system for peak shaving in coal-fired power units.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To address the shortcomings or defects of existing technologies, a peak-shaving system and method for coal-fired power units coupled with phase change spherical capsule stacking tanks is provided. Using phase change spherical capsules not only enables direct heat exchange between the heat exchange fluid and the thermal storage system but also avoids problems such as phase change material leakage, improving the safety of the thermal storage system during operation. During load reduction and peak shaving, excess heat from the coal-fired power unit is stored in the phase change spherical capsules. During load increase and peak shaving, the heat from the phase change spherical capsules is used to heat steam, thereby improving the thermal efficiency of the coal-fired power unit. Through direct contact heat exchange between steam and the phase change spherical capsules in the stacking tank, system efficiency is improved, making the operation of the coal-fired power unit more flexible and adjustable.

[0006] The objective of this invention is achieved through the following technical solutions.

[0007] A peak-shaving system for a coal-fired power unit coupled with a phase change spherical capsule stacking tank includes a boiler system, a turbine generator system, a steam circulation system, and a phase change spherical capsule stacking system. The boiler system includes a superheater and a reheater along the steam flow direction; the turbine generator system includes a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, and a generator along the shaft direction; the steam circulation system includes a condenser, a main water pump regulating valve, a condensate pump, a low-pressure heater, a deaerator, a first feedwater pump regulating valve, a first feedwater pump, and a high-pressure heater along the steam flow direction; the phase change spherical capsule stacking system includes a low-temperature phase change spherical capsule stacking tank storage device, a high-temperature phase change spherical capsule stacking tank storage device, a steam source device, a first phase change spherical capsule stacking tank containing phase change material encapsulated in spherical capsules, a second phase change spherical capsule stacking tank, and a third... N -2 phase change spherical capsule stacking tanks, the first N -1 phase change spherical capsule stacking vessel and the first N A phase change spherical capsule stacking tank; the phase change material of the phase change spherical capsule is encapsulated in the spherical capsule, and its solid sensible heat, liquid sensible heat and latent heat are all utilized, with an operating temperature range of 25℃-500℃.

[0008] In the peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacker, the outlet of the superheater is connected to the inlet of the high-pressure cylinder via the main steam regulating valve; the outlet of the high-pressure cylinder is connected to the inlet of the reheater; the outlet of the reheater is connected to the inlet of the intermediate-pressure cylinder and the inlet of the low-pressure cylinder via the reheat steam regulating valve; the high-pressure cylinder, intermediate-pressure cylinder, and low-pressure cylinder are connected to the generator via a rotating shaft; the outlet of the low-pressure cylinder is connected to the inlet of the condenser; the outlet of the condenser is connected to the inlet of the condensate pump via the main water pump regulating valve; the outlet of the condensate pump is connected to the inlet of the low-pressure heater; the outlet of the low-pressure heater is connected to the inlet of the deaerator; the outlet of the deaerator is connected to the first feedwater pump and the high-pressure heater via the first feedwater pump regulating valve; the outlet of the high-pressure heater is connected to the inlet of the superheater.

[0009] In the peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank, the second outlet of the superheater is connected to the inlet of the main steam extraction pressure reducing valve via the main steam extraction regulating valve; the second outlet of the reheater is connected to the inlet of the reheat steam extraction pressure reducing valve via the reheat steam extraction regulating valve; the outlets of the main steam extraction pressure reducing valve and the reheat steam extraction pressure reducing valve are connected to the inlet of the low-temperature phase change spherical capsule stacking tank storage device via the extraction regulating valve; and the outlet of the low-temperature phase change spherical capsule stacking tank storage device is connected to the inlet of the high-temperature phase change spherical capsule stacking tank storage device.

[0010] In the peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank, the steam inside the phase change spherical capsule stacking tank flows directly through the surface of the phase change spherical capsule for heat exchange.

[0011] In the peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank, the surface of the phase change spherical capsule is smooth or has a pitted structure.

[0012] In the peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank, high thermal conductivity metal fins and foam metal are added inside the phase change spherical capsule.

[0013] In the peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank, the phase change material encapsulated in the phase change spherical capsule is one or more materials, namely inorganic phase change material, organic phase change material and composite phase change material.

[0014] In the peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank, the phase change spherical capsule stacking tank has a disordered stacking structure or an ordered stacking structure.

[0015] In the peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank, the ordered stacking structure enables the phase change spherical capsules to be stacked in an orderly manner through a grid.

[0016] The peak-shaving system of a coal-fired power unit coupled with a phase change spherical capsule stacker includes the following steps. When it is necessary to reduce the load of the coal-fired unit, the main steam of the superheater heats the phase change spherical capsule stacking tank in the low-temperature phase change spherical capsule stacking tank storage device through the main steam extraction regulating valve and the main steam extraction pressure reducing valve, and the reheat steam of the reheater heats the phase change spherical capsule stacking tank in the low-temperature phase change spherical capsule stacking tank storage device through the reheat steam extraction regulating valve and the reheat steam extraction pressure reducing valve. When the predetermined temperature is reached, the phase change spherical capsule stacking tank is transported to the high-temperature phase change spherical capsule stacking tank storage device for storage. When it is necessary to increase the load of the coal-fired unit, the first phase change spherical capsule stacking tank will increase the steam temperature from the steam source device from... T 0 upgraded to T After that, it enters the low-temperature phase change spherical capsule stacking tank storage device, and the second phase change spherical capsule stacking tank will reduce the steam temperature from... T 1 upgraded to T 2. And so on, the first... N A phase change spherical capsule stacking tank will reduce the steam temperature from... T n-1 is promoted to T n enters the generator to generate electricity.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: When a coal-fired power unit reduces load for peak shaving, excess heat is stored in a phase change spherical capsule stacking tank. When the coal-fired power unit increases load for peak shaving, the heat in the phase change spherical capsule stacking tank is used to heat steam to increase the power of the coal-fired power unit. The phase change material is encapsulated in spherical capsules, and its solid sensible heat, liquid sensible heat, and latent heat are all utilized, with an operating temperature range of 25℃-500℃. Encapsulating the phase change material in spherical capsules avoids problems such as leakage of the phase change material and improves the safety of the system. The grid enables the phase change spherical capsules to be stacked quickly and orderly, and steam flows directly through the phase change spherical capsule stacking tank to exchange heat with the phase change spherical capsules, saving system costs.

[0018] The description provided is merely an overview of the technical solution of this invention. In order to make the technical means of this invention clearer and more understandable, so that those skilled in the art can implement it according to the contents of the specification, and to make the described and other objects, features and advantages of this invention more obvious and understandable, specific embodiments of this invention are described below. Attached Figure Description

[0019] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the peak-shaving system and method of a coal-fired unit coupled with a phase change spherical capsule stacking tank provided by the present invention; Figure 2 A schematic diagram of a phase change spherical capsule stacking system for heat storage / release and its method; Figure 3 Schematic diagram of a low / high temperature phase change spherical capsule stacking tank storage device; In the diagram: 1. Superheater; 2. Reheater; 3. High-pressure cylinder; 4. Intermediate-pressure cylinder; 5. Low-pressure cylinder; 6. Generator; 7. Condenser; 8. Condensate pump; 9. Low-pressure heater; 10. Deaerator; 11. First feedwater pump; 12. High-pressure heater; 13. Low-temperature phase change spherical capsule storage tank; 14. High-temperature phase change spherical capsule storage tank; 15. Steam source device; 16. First phase change spherical capsule storage tank; 17. Second phase change spherical capsule storage tank; 18. Third... N - 2 phase change spherical capsule stacking tanks; 19. N-1 phase change spherical capsule stacking vessel; 20. N 21. Phase change spherical capsule stacking tank; 22. Main steam regulating valve; 23. Reheat steam regulating valve; 24. Water pump main line regulating valve; 25. First feed water pump regulating valve; 26. Main steam extraction regulating valve; 27. Reheat steam extraction regulating valve; 28. Main steam extraction pressure reducing valve;

[0021] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0022] Specific embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0023] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out the invention; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0024] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments, and the accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0025] To better understand, such as Figures 1 to 3As shown, a peak-shaving system for a coal-fired power unit coupled with a phase change spherical capsule stacking tank includes a boiler system, a turbine generator system, a steam circulation system, and a phase change spherical capsule stacking system. The boiler system includes a superheater 1 and a reheater 2 along the steam flow direction. The turbine generator system includes a high-pressure cylinder 3, an intermediate-pressure cylinder 4, a low-pressure cylinder 5, and a generator 6 along the shaft. The steam circulation system includes a condenser 7, a main water pump regulating valve 23, a condensate pump 8, a low-pressure heater 9, a deaerator 10, a first feedwater pump regulating valve 24, a first feedwater pump 11, and a high-pressure heater 12 along the steam flow direction. The phase change spherical capsule stacking system includes a low-temperature phase change spherical capsule stacking tank storage device 13, a high-temperature phase change spherical capsule stacking tank storage device 14, a steam source device 15, a first phase change spherical capsule stacking tank 16, a second phase change spherical capsule stacking tank 17, and a third phase change spherical capsule stacking tank 18. N -2 phase change spherical capsule stacking tanks, No. 18 N -1 phase change spherical capsule stacking vessel 19, No. N A phase change spherical capsule stacking tank 20; the phase change spherical capsule stacking tank encapsulates phase change materials in spherical capsules; the surface of the phase change spherical capsules is smooth or pitted; high thermal conductivity metal fins and foam metal can be added inside the phase change spherical capsules; the phase change material can be inorganic phase change material, organic phase change material, or composite phase change material, utilizing its solid-state sensible heat, liquid-state sensible heat, and latent heat, with an operating temperature range of 25℃-500℃; the phase change spherical capsule stacking tank has a total of N The phase change spherical capsule stacking tank has either a disordered or ordered stacking structure. The ordered stacking structure is achieved by using a grid to enable rapid and orderly stacking of the phase change spherical capsules. The phase change material encapsulated in the phase change capsules within the stacking tank can be one or more materials. The phase change capsules within the stacking tank are arranged in a stepped manner along the heat exchange fluid flow direction. When it is necessary to reduce the load of the coal-fired unit, the main steam and reheat steam are heated by the main steam extraction regulating valve 25, the main steam extraction pressure reducing valve 27, the reheat steam extraction regulating valve 26, and the reheat steam extraction pressure reducing valve 28, respectively. The phase change spherical capsule stacking tank in the low-temperature phase change spherical capsule stacking tank storage device 13 is heated to the specified temperature. When the specified temperature is reached, the phase change spherical capsule stacking tank is transported to the high-temperature phase change spherical capsule stacking tank storage device 14 for storage. When it is necessary to increase the load of the coal-fired unit, the first phase change spherical capsule stacking tank 16 will transfer the steam temperature from the steam source device 15 from... T 0 upgraded to T After 1, it exits the system and enters the low-temperature phase change spherical capsule stacking tank storage device 13. The second phase change spherical capsule stacking tank 17 will reduce the steam temperature from T 1 upgraded toT After that, it is converted into the first phase change spherical capsule stacking tank 16 to reduce the subsequent steam temperature from T 0 upgraded to T 1. And so on, the aforementioned first... N A phase change spherical capsule stacking tank 20 will reduce the steam temperature from... T n-1 is promoted to T n enters generator 6 to generate electricity and is converted into the first N -1 phase change spherical capsule stacking tank 19 will reduce the subsequent steam temperature from T n-2 is increased to T n-1, the high-temperature phase change spherical capsule stacking tank storage device 14 continuously replenishes the n-1, N A phase change spherical capsule stacking tank 20 will reduce the steam temperature from... T n-1 is promoted to T n enters generator 6 to generate electricity.

[0026] The Nth phase change spherical capsule stacking tank is replenished via a conveying device. After heating steam, the outlet temperature of the steam in the phase change spherical capsule stacking tank increases, while the temperature of each phase change spherical capsule in the tank decreases. Steam continuously enters the system from the steam source device 15, with its temperature sequentially increasing from T0 to T1, T2, and so on until Tn, before entering the generator system for power generation. Therefore, after heating the first portion of steam, the Nth phase change spherical capsule stacking tank raises the steam temperature from Tn-1 to Tn. Simultaneously, at this moment, the temperature of the phase change spherical capsules inside the Nth phase change spherical capsule stacking tank decreases. Therefore, the Nth phase change spherical capsule stacking tank... N phase change spherical capsule stacking tanks can no longer be used to heat steam with an inlet temperature of Tn-1. Therefore, the Nth phase change spherical capsule stacking tank is transformed into the (N-1)th phase change spherical capsule stacking tank through a conveying device to heat steam with an inlet temperature of Tn-2. Similarly, after heating a portion of the steam, the temperature of the second phase change spherical capsule stacking tank 17 decreases, and it needs to be transformed into the first phase change spherical capsule stacking tank 16 through a conveying device for use, until it leaves the heating system and enters the low-temperature phase change spherical capsule stacking tank storage device for storage.

[0027] The outlet of superheater 1 is connected to the inlet of high-pressure cylinder 3 via main steam regulating valve 21; the outlet of high-pressure cylinder 3 is connected to the inlet of reheater 2; the outlet of reheater 2 is connected to the inlet of intermediate-pressure cylinder 4 and the inlet of low-pressure cylinder 5 via reheat steam regulating valve 22; high-pressure cylinder 3, intermediate-pressure cylinder 4, and low-pressure cylinder 5 are connected to generator 6 via a rotating shaft; the outlet of low-pressure cylinder 5 is connected to the inlet of condenser 7; the outlet of condenser 7 is connected to the inlet of condensate pump 8 via main pump regulating valve 23; the outlet of condensate pump 8 is connected to the inlet of low-pressure heater 9; the outlet of low-pressure heater 9 is connected to the inlet of deaerator 10; the outlet of deaerator 10 is connected to the first feedwater pump 11 and high-pressure heater 12 via first feedwater pump regulating valve 24; the outlet of high-pressure heater 12 is connected to the inlet of superheater 1.

[0028] The second outlet of the superheater 1 is connected to the inlet of the main steam extraction pressure reducing valve 27 via the main steam extraction regulating valve 25; the second outlet of the reheater 2 is connected to the inlet of the reheat steam extraction pressure reducing valve 28 via the reheat steam extraction regulating valve 26; the outlets of the main steam extraction pressure reducing valve 27 and the reheat steam extraction pressure reducing valve 28 are connected to the inlet of the low-temperature phase change spherical capsule stacking tank storage device 13 via extraction regulating valves; the outlet of the low-temperature phase change spherical capsule stacking tank storage device 13 is connected to the inlet of the high-temperature phase change spherical capsule stacking tank storage device 14.

[0029] In the phase change spherical capsule stacking tank, steam flows directly over the surface of the phase change spherical capsules for heat exchange; the phase change material is encapsulated within the spherical capsules; the surface of the phase change spherical capsules is smooth or has a pitted structure; highly thermally conductive metal fins and foamed metal can be added inside the phase change spherical capsules; the phase change material can be inorganic, organic, or composite, utilizing its solid-state sensible heat, liquid-state sensible heat, and latent heat, with an operating temperature range of 25℃-500℃; the phase change material encapsulated in the phase change capsules within the stacking tank can be one or more materials; the phase change capsules within the stacking tank are arranged in a stepped manner along the heat exchange fluid flow direction.

[0030] When the coal-fired unit reduces its load, the excess heat enters the low-temperature phase change spherical capsule stacking tank storage device 13 through the main steam extraction regulating valve 25, the reheat steam extraction regulating valve 26, the main steam extraction pressure reducing valve 27, and the reheat steam extraction pressure reducing valve 28 to heat the phase change spherical capsule stacking tank stored therein. After the heat storage process is completed, the heat is transported to the high-temperature phase change spherical capsule stacking tank storage device 14 for storage.

[0031] When a basic coal-fired power unit needs to increase its load, more steam is required to power the generator. Lower-temperature water or steam is supplied externally via steam source device 15 to raise the temperature in the phase change spherical capsule stacking system until it reaches the generator's operating temperature. The high-temperature steam then powers the generator to compensate for the increased load. During load increases in the coal-fired power unit, the first phase change spherical capsule stacking tank 16 raises the steam temperature from... T 0 upgraded to T After 1, it exits the system and enters the low-temperature phase change spherical capsule stacking tank storage device 13; the second phase change spherical capsule stacking tank 17 lowers the steam temperature from... T 1 upgraded to T After 2, it becomes a phase change spherical capsule stacking tank 16, which will then heat the subsequent steam from... T 0 upgraded to T 1. And so on, the aforementioned first... N A phase change spherical capsule stacking tank 20 will reduce the steam temperature from... T n-1 is promoted to T n enters generator 6 to generate electricity and becomes the first N -1 phase change spherical capsule stacking tank 19 will reduce the subsequent steam temperature from T n-2 is increased to T n-1, the high-temperature phase change spherical capsule stacking tank storage device 1 continuously replenishes the n-1, N A phase change spherical capsule stacking tank 20 will reduce the steam temperature from... T n-1 is promoted to T n enters generator 6 to generate electricity, thereby increasing the power output of the coal-fired unit and meeting the peak-shaving needs of the coal-fired unit.

[0032] The system has three operating modes: Mode 1: The system does not require peak shaving by the phase change spherical capsule stacking system. In this mode, the main steam extraction regulating valve 25 and reheat steam extraction regulating valve 26 are closed, while the main steam regulating valve 21, reheat steam regulating valve 22, main water pump regulating valve 23, and first feedwater pump regulating valve 24 are open, and the coal-fired unit operates normally. Mode 2: The system requires increased load operation. In this mode, the main steam regulating valve 21, reheat steam regulating valve 22, main water pump regulating valve 23, and first feedwater pump regulating valve 24 are open, the coal-fired unit operates, and the main steam extraction regulating valve 25 and reheat steam extraction regulating valve 26 are closed. Figure 1 and Figure 2 The first phase change spherical capsule stacking tank 16, as shown, draws steam from the steam source device 15 at a temperature from... T 0 upgraded to T After 1, it exits the system and enters the low-temperature phase change spherical capsule stacking tank storage device 13. The second phase change spherical capsule stacking tank 17 will reduce the steam temperature from... T1 upgraded to T After that, it is converted into the first phase change spherical capsule stacking tank 16 to reduce the subsequent steam temperature from T 0 upgraded to T 1, and so on, the 1st N A phase change spherical capsule stacking tank 20 will reduce the steam temperature from... T n-1 is promoted to T n enters generator 6 to generate electricity and is converted into the first N -1 phase change spherical capsule stacking tank 19 will reduce the subsequent steam temperature from T n-2 is increased to T n-1, High-temperature phase change spherical capsule stacking tank storage device 14 is continuously replenished. N A phase change spherical capsule stacking tank 20 will reduce the steam temperature from... T n-1 is promoted to T n enters generator 6 for power generation. The third mode: The system needs to operate at reduced load. At this time, the main steam regulating valve 21, reheat steam regulating valve 22, main water pump regulating valve 23, and first feedwater pump regulating valve 24 are open, the coal-fired unit is running, and the main steam extraction regulating valve 25 and reheat steam extraction regulating valve 26 are open. Excess heat is used to heat the phase change spherical capsule stacking tank in the low-temperature phase change spherical capsule stacking tank storage device 13. After heat storage is completed, such as... Figure 1 and Figure 3 The phase change spherical capsule stacking tank shown is transported to the high-temperature phase change spherical capsule stacking tank storage device 14 for storage.

[0033] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0034] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A peak-shaving system for a coal-fired power unit coupled with a phase change spherical capsule stacking tank, characterized in that, It includes a boiler system, a steam turbine generator system, a steam circulation system, and a phase change spherical capsule stacking system. The boiler system includes a superheater and a reheater along the steam flow direction; the steam turbine generator system includes a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, and a generator along the shaft direction; the steam circulation system includes a condenser, a main water pump regulating valve, a condensate pump, a low-pressure heater, a deaerator, a first feedwater pump regulating valve, a first feedwater pump, and a high-pressure heater along the steam flow direction; the phase change spherical capsule stacking system includes a low-temperature phase change spherical capsule stacking tank storage device, a high-temperature phase change spherical capsule stacking tank storage device, a steam source device, a first phase change spherical capsule stacking tank containing phase change material encapsulated in spherical capsules, a second phase change spherical capsule stacking tank, and a third... N -2 phase change spherical capsule stacking tanks, the first N -1 phase change spherical capsule stacking vessel and the first N A phase change spherical capsule stacking tank; the phase change material of the phase change spherical capsule is encapsulated in the spherical capsule, and its solid sensible heat, liquid sensible heat and latent heat are all utilized, with an operating temperature range of 25℃-500℃.

2. The peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank as described in claim 1, characterized in that, Preferably, the first outlet of the superheater is connected to the inlet of the high-pressure cylinder via the main steam regulating valve.

3. The peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank as described in claim 1, characterized in that, The second outlet of the superheater is connected to the inlet of the main steam extraction pressure reducing valve via the main steam extraction regulating valve.

4. The peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank as described in claim 1, characterized in that, The steam inside the phase change spherical capsule stacking tank flows directly over the surface of the phase change spherical capsule for heat exchange.

5. The peak-shaving system of a coal-fired unit coupled with a phase change spherical capsule stacking tank as described in claim 1, characterized in that, The surface of the phase change spherical capsule is either smooth or has a pitted structure.

6. The peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank as described in claim 1, characterized in that, The phase change spherical capsule is internally reinforced with highly thermally conductive metal fins and foam metal.

7. The peak-shaving system of a coal-fired unit coupled with a phase change spherical capsule stacking tank as described in claim 1, characterized in that, The phase change material encapsulated in the phase change spherical capsule is one or more materials, including inorganic phase change materials, organic phase change materials, and composite phase change materials.

8. The peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank as described in claim 1, characterized in that, The phase change spherical capsule stacking tank has a disordered or ordered stacking structure.

9. The peak-shaving system of the coal-fired unit coupled with the phase change spherical capsule stacking tank as described in claim 8, characterized in that, The ordered stacking structure enables the phase change spherical capsules to be stacked in an orderly manner through a grid.

10. A method for processing a peak-shaving system of a coal-fired unit coupled with a phase change spherical capsule stacking tank as described in any one of claims 1-9.

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