Rapid and flexible peak and frequency regulation system of coal-fired unit based on high-temperature working medium energy storage / supply
By combining high-temperature thermal storage technology with the thermal cycle system of coal-fired units, and using the high-temperature working fluid storage/energy supply system to heat the feedwater regeneration system, the problem of slow response rate of coal-fired units under changing loads has been solved, and the ability to quickly regulate peak loads and frequencies and efficiently absorb new energy sources has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-03-24
AI Technical Summary
Coal-fired power generating units have a slow response rate to load changes, which limits their ability to quickly regulate peak and frequency, especially in new power systems where their capacity to absorb wind and solar energy is insufficient.
By combining traditional coal-fired thermal power generation systems with high-temperature thermal storage technology, and coupling the high-temperature working fluid storage/supply system with the thermal cycle system of the coal-fired unit, the steam extraction volume of each stage of the turbine is reduced, and the feedwater in the feedwater regeneration system is heated by the high-temperature working fluid, thereby improving the boiler steam yield and the unit's ability to respond quickly to load changes.
It enables rapid peak shaving and frequency regulation of coal-fired power units, improves the unit's ramp-up rate and load change response capability, and enhances the stability and reliability of the new power system.
Smart Images
Figure CN224032657U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of conventional power generation technology and energy storage technology, especially to a coal-fired unit fast flexible peak load and frequency modulation system based on high-temperature working medium storage / supply energy. BACKGROUND
[0002] In the coal-fired power generation unit, from the coal entering the furnace combustion to generating steam to drive the steam turbine to generate electricity, there are multiple links in between, especially in the boiler, there are coal powder preparation, combustion heat release and working medium heat absorption process (the process has a relatively long delay time). First, the preparation, transportation and combustion of coal powder is a relatively slow process. When the coal feeder increases the coal supply, the coal needs to go through the process of coal mill grinding and coal powder transportation to the boiler burner nozzle, and then the coal powder goes through the drying, pyrolysis, ignition and burnout process in the furnace. For large coal powder boilers, from coal feeding to coal powder burnout in the furnace, it needs to go through a 3-6 minute delay. In addition, the heat released after the combustion of coal is transferred to the working medium in the boiler heating surface, especially under low load conditions, due to the low temperature of the furnace, the heat storage of the heating surface, and the heat release to the working medium absorption process also has a certain delay, which generally lasts for 3-4 minutes. In addition, the working medium circulating in the boiler also needs a certain time. Taking a natural circulation boiler as an example, the water in the circulating process of heating and rising and cooling and descending will transfer heat from the combustion area to the entire steam-water system, which may last for several minutes, resulting in that the steam production cannot immediately respond to the change of combustion.
[0003] Due to the large hysteresis and delay of the coal-fired power generation unit, its fast peak load regulation capability is limited. In order to further improve the peak load regulation and frequency modulation performance of the traditional coal-fired power generation unit, especially the fast load change response capability of the unit, it is of great significance to improve the wind and light consumption capability of the high-proportion new energy new power system, and to ensure the safe and reliable operation of the new power system. It is urgent to improve the fast peak load regulation and frequency modulation capability of the traditional coal-fired power generation. INVENTION CONTENTS
[0004] The utility model aims at overcoming the slow load change response rate of the existing coal-fired unit thermal system, combining the traditional coal-fired thermal power generation system with high-temperature heat storage technology, improving the primary frequency modulation and load change response rate, and realizing the fast peak load regulation and frequency modulation of the coal-fired unit.
[0005] In order to realize the above-mentioned purpose, the utility model provides a kind of coal-fired unit quick flexible peak load regulation and frequency modulation system based on high-temperature working medium storage / supply energy, including coal-fired unit thermal cycle system and high-temperature working medium storage / supply energy system, wherein, the high-temperature working medium storage / supply energy system is coupled with coal-fired unit thermal cycle system, reduce the steam extraction amount of each stage of steam turbine in coal-fired unit thermal cycle system, quickly promote the work capacity of coal-fired unit, improve the climbing rate of coal-fired unit;While high-temperature working medium storage / supply energy system directly acts on feedwater regenerative system in coal-fired unit thermal cycle system, the high-enthalpy working medium of high-temperature working medium storage / supply energy system heats feedwater in feedwater regenerative system, improves boiler feedwater temperature, and then promotes boiler steam production rate, realizes the quick load response capability of coal-fired unit.
[0006] Preferably, the coal-fired unit thermal cycle system includes a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a heater, and a feedwater heater; wherein the heater includes a high-pressure heater, a deaerator, and a low-pressure heater;
[0007] The steam extraction outlet of the high-pressure cylinder of the steam turbine is guided to the hot end inlet of the high-pressure heater, and the steam extraction outlets of the medium-pressure cylinder and the low-pressure cylinder are respectively connected to the hot end inlet of the high-pressure heater and the inlet of the deaerator, and the steam extraction outlet of the low-pressure cylinder flows to the hot end inlet of the remaining low-pressure heater. These steam extractions and drainages flow through the hot end inlets of the high-pressure heater, the deaerator, and the low-pressure heater in sequence, and the hot ends between the heaters are connected in series.
[0008] The outlet of the condenser is connected to the cold end inlet of the last-stage low-pressure heater, and the cold end outlet of the highest-stage high-pressure heater is connected to the inlet of the boiler economizer. The cold ends between the low-pressure heaters and the cold end of the high-pressure heater are also connected in series, and the low-pressure heaters are connected to the high-pressure heater through the deaerator.
[0009] A feedwater-high-pressure heater bypass is arranged at the outlet of the deaerator, and a gate valve and an adjusting valve are arranged on the feedwater-high-pressure heater bypass. Part of the high-pressure feedwater flows into the feedwater heater as a cold source through the valves.
[0010] Preferably, the high-temperature working medium storage / supply energy system includes a heat storage tank, an energy storage pipeline, an energy release pipeline, and a valve.
[0011] The heat storage tank is provided with a water-steam heat exchanger, and the steam extraction of the coal-fired unit is connected to the hot end inlet of the water-steam heat exchanger. The hot end outlet of the water-steam heat exchanger is connected to the deaerator. The energy release pipeline of the heat storage tank is connected to the hot end inlet of the feedwater heater of the feedwater-high-pressure heater bypass. The hot end outlet of the feedwater heater is connected to the deaerator.
[0012] Preferably, the high-temperature working medium storage / supply energy system includes a heat storage tank, an energy storage pipeline, an energy release pipeline, and a valve.
[0013] The water-steam heat exchanger is connected with the heat extraction pipeline of the thermal storage tank and the hot end inlet of the feedwater heat exchanger on the bypass of the feedwater-high pressure heater.
[0014] Preferably, the water-steam heat exchanger is a heat exchanger of indirect heat exchange.
[0015] Preferably, the water-steam heat exchanger is a heat exchanger of direct mixing heat exchange.
[0016] The utility model discloses a kind of based on high-temperature working medium storage / supply energy's coal-fired unit fast flexible peak shaving and frequency modulation method, characterized in that, when grid load demand is in low ebb and needs energy storage, coal-fired unit during operation, part of desalted water of coal-fired unit thermal cycle system enters thermal storage tank through energy storage pipeline system;Part of the steam of high pressure heater extraction of coal-fired unit thermal cycle system enters thermal storage tank through bypass, through direct and / or indirect heat exchange mode, the temperature, pressure of working medium in thermal storage tank is promoted to design value;
[0017] When the working medium parameter in thermal storage tank reduces to certain value, timely supplement certain amount of steam, ensure that the working medium in thermal storage tank is in certain parameter range.
[0018] Preferably, the working pressure range of the thermal storage tank is 1.5-20 MPa, and the corresponding temperature is the saturation temperature at the pressure.
[0019] The utility model discloses a kind of based on high-temperature working medium storage / supply energy's coal-fired unit fast flexible peak shaving and frequency modulation method, when grid load needs unit fast climbing, open thermal storage tank energy release pipeline valve, high-temperature steam in thermal storage tank enters the hot end of feedwater- high feedwater bypass feedwater heat exchanger, simultaneously, feedwater-high feedwater bypass valve is opened, part of high pressure feedwater of coal-fired unit enters the cold end of feedwater heat exchanger;Because the feedwater that flows through high pressure heater reduces, the extraction that enters high pressure heater also synchronously reduces, to further fast promote the function of steam turbine, realize the fast promotion of unit load, simultaneously, boiler feedwater temperature is not reduced temperature because of the reduction of steam turbine extraction.
[0020] Compared with prior art, the utility model has following effect:
[0021] 1、the utility model discloses that coal-fired unit thermal system is coupled with the high-temperature working medium storage / supply energy system containing high-quality working medium, through feedwater-high pressure heater bypass, high-quality working medium storage and energy release in high-temperature working medium thermal storage tank (1 or 2 or more, according to need, multiple thermal storage tanks can be in series, parallel or series / parallel), realize the fast flexible response and peak shaving, frequency modulation of coal-fired unit.
[0022] 2. When the unit load is at the bottom and needs to be stored (the working medium in the heat storage tank has been released), part of the working medium in the unit feedwater system enters the boiler water heat storage device, and the working medium in the heat storage device is heated and pressurized by the steam turbine extraction (direct heat storage or indirect heat exchange), and after the heat storage is completed, a certain amount of steam is supplemented in time to ensure that the temperature and pressure of the working medium in the heat storage tank are within the designed temperature and pressure range (the heat storage device is in a usable state).
[0023] 3. When the grid load needs to be quickly ramped up, the high-pressure feedwater part (or all) enters the bypass, and the high-enthalpy working medium in the heat storage tank is used to heat it to maintain the boiler feedwater temperature unchanged or increased (to ensure that the working medium at the outlet of the economizer is not vaporized), thereby reducing the extraction amount of each stage of the steam turbine. The reduction of the extraction amount can quickly increase the power generation capacity of the unit.
[0024] 4. The high-enthalpy working medium in the heat storage tank can further reduce the extraction amount of the low-pressure heater after heat exchange through the feedwater heat exchanger if it is introduced into the deaerator, thereby further increasing the unit load.
[0025] The concept, specific structure and technical effects of the present application will be further described in combination with the accompanying drawings to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 is a system structure diagram of the first embodiment of the present application;
[0027] Figure 2 is a system structure diagram of the second embodiment of the present application.
[0028] In the figure: 1, steam energy storage pipeline inlet; 2, on-off valve one; 3, valve two; 4, heat storage tank; 5, boiler water energy release pipeline; 6, water-steam heat exchanger; 7, communication valve; 8, on-off valve three; 9, boiler water energy storage pipeline; 10, safety valve; 11, steam energy storage pipeline outlet; 12, steam energy release pipeline; 13, valve four; 14, high-pressure feedwater bypass; 15, feedwater heat exchanger; 16, valve five; 17, mixer; 18, high-pressure feedwater pipeline; 19, boiler; 20, superheated steam; 21, high-pressure cylinder; 22 and 23, high-pressure cylinder extraction outlet; 24, reheated steam; 25, medium-pressure cylinder; 26 and 27, medium-pressure cylinder extraction outlet; 28, low-pressure cylinder; 29 to 32, low-pressure cylinder extraction outlet; 33, generator; 34, condenser; 35, condensate pump; 36, low-pressure heater; 37, deaerator; 38, heat user; 39, feedwater pump; 40, high-pressure heater. DETAILED DESCRIPTION
[0029] The technical content of the present application will be more clearly understood and facilitated to be understood by introducing the preferred embodiments of the present application with reference to the accompanying drawings of the specification.
[0030] In the drawings, the components of the same structure are denoted by the same reference numerals, and the components similar in structure or function are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present application is not limited to the size and thickness of each component. In order to make the drawing clearer, the thickness of the components is appropriately exaggerated in some places in the drawing.
[0031] Example 1 (indirect heat exchange mode is used for heat storage tank)
[0032] In order to improve the accommodation capacity of the power system to wind and light and ensure the safe and reliable operation of the power system, in view of the problem that the coal-fired unit boiler has a slow variable load response rate under low load operation condition, a coal-fired unit combined peak shaving and frequency modulation system coupled with high-pressure heater extraction-feeding water bypass and high-temperature working medium storage / supply device is provided.
[0033] The present application combines the traditional coal-fired thermal power generation system with high-temperature heat storage technology, and realizes the rapid peak shaving and frequency modulation of the coal-fired unit through the improvement of the primary frequency modulation and the variable load response rate.
[0034] The present application stores the high-temperature and high-pressure saturated water during the high load operation of the boiler in the high-temperature water storage device, and when the unit needs to be rapidly climbed at the low load section, the high-pressure feed water part (or all) enters the bypass, and the high-enthalpy working medium of the heat storage tank is used to heat it to maintain the boiler feed water temperature unchanged or increased (to ensure that the working medium at the outlet of the economizer is not vaporized), so as to reduce the extraction amount of each stage of the steam turbine, and the reduction of the extraction amount realizes the rapid improvement of the power generation capacity of the unit.
[0035] As shown in Figure 1 The present embodiment provides a coal-fired unit rapid flexible peak shaving and frequency modulation system based on high-temperature working medium storage / supply, which comprises a coal-fired unit thermal cycle system and a high-temperature working medium storage / supply system, wherein the high-temperature working medium storage / supply system is coupled with the coal-fired unit thermal cycle system, the extraction amount of each stage of the steam turbine in the coal-fired unit thermal cycle system is reduced, the power generation capacity of the coal-fired unit is rapidly improved, and the climbing rate of the coal-fired unit is improved; at the same time, the high-temperature working medium storage / supply system directly acts on the feed water regenerative system in the coal-fired unit thermal cycle system, the high-enthalpy working medium of the high-temperature working medium storage / supply system heats the feed water in the feed water regenerative system, the boiler feed water temperature is improved, the boiler steam production rate is improved, and the rapid variable load response capacity of the coal-fired unit is realized.
[0036] The thermal cycle system of the coal-fired unit comprises a boiler 19, a high-pressure cylinder 21, a medium-pressure cylinder 25, a low-pressure cylinder 28, a condenser 34, a heater and a feed water heat exchanger 15; wherein the heater comprises a high-pressure heater 40, a deaerator 37 and a low-pressure heater 36;
[0037] The high-pressure cylinder extraction steam outlets 22 and 23 of the high-pressure cylinder 21 are guided to the hot end inlets of the high-pressure heater 40, the medium-pressure cylinder extraction steam outlets 26 and 27 of the medium-pressure cylinder 25 are guided to the hot end inlets of the high-pressure heater 40 and the inlet of the deaerator 37 respectively, and the low-pressure cylinder extraction steam outlets 29 to 32 of the low-pressure cylinder 28 are guided to the hot end inlets of the remaining low-pressure heaters 36; these extraction steam and drain water flow through the hot end inlets of the high-pressure heater 40, the deaerator 37 and the low-pressure heater 36 in sequence, and the hot ends of the respective heaters are connected in series;
[0038] The outlet of the condenser 34 is connected to the cold end inlet of the last-stage low-pressure heater 36, and the cold end outlet of the highest-stage high-pressure heater 40 is connected to the inlet of the boiler economizer; the cold ends of the low-pressure heaters 36 and the cold end of the high-pressure heater 40 are also connected in series, and the low-pressure heater 36 is connected to the high-pressure heater 40 through the deaerator 37;
[0039] A high-pressure feed water bypass 14 is arranged at the outlet of the deaerator 37, and a gate valve and an adjusting valve are arranged on the high-pressure feed water bypass 14; part of the high-pressure feed water is used as a cold source and flows into the feed water heat exchanger 15 through the valve.
[0040] The high-temperature working medium storage / supply energy system of the embodiment comprises a heat storage tank 4, an energy storage pipeline, an energy release pipeline and a valve;
[0041] A water-steam heat exchanger 6 is arranged in the heat storage tank 4, and the extraction steam of the coal-fired unit is connected to the hot end inlet of the water-steam heat exchanger 6 in the heat storage tank; the hot end outlet of the water-steam heat exchanger 6 is connected to the deaerator 37; the energy release pipeline of the heat storage tank is connected to the hot end inlet of the feed water heat exchanger 15 on the high-pressure feed water bypass 9; and the hot end outlet of the feed water heat exchanger 15 is connected to the deaerator 37.
[0042] The extraction steam of the high-pressure cylinder is connected to the hot end inlet of the water-steam high-temperature heat exchanger 6 through the steam energy storage pipeline inlet 1; the steam energy storage pipeline outlet 10 is connected to the deaerator 37 (or a heat user 38); the boiler water energy storage pipeline 9 is connected to the inlet of the heat storage tank 4; the boiler water energy release pipeline 5 is connected to the outlet of the deaerator 37; and the steam energy release pipeline 12 is connected to the hot end of the feed water heat exchanger 15.
[0043] The working medium of the feedwater system exchanges heat with the high-pressure cylinder extraction steam through a water-steam heat exchanger 6; the furnace water, after heat exchange in the water-steam heat exchanger 6, becomes saturated working medium with certain temperature and pressure, and is stored in the heat storage tank 4; the high-pressure cylinder extraction steam, after heat exchange, flows out from the steam energy storage pipeline outlet 11 and is connected with the deaerator 37 (or the heat user 38);
[0044] The energy release pipeline can be opened and closed; the saturated water released by the high-quality energy storage device is connected with the outlet pipeline of the deaerator 37 through the furnace water energy release pipeline 5; the saturated steam released by the high-quality energy storage device is connected with the input and output pipeline of the hot end of the feedwater heat exchanger 14 through the steam energy release pipeline 11; the high-pressure feedwater bypass 14 is connected with the input and output pipeline of the cold end of the feedwater heat exchanger 15; the hot end flows into the deaerator 37 (or the heat user 38) after passing through the feedwater heat exchanger 15; the cold end flows into the mixer 17 and mixes with the high-pressure feedwater of the high-pressure feedwater pipeline 18 after passing through the feedwater heat exchanger 15;
[0045] In the preferred embodiment, the steam energy storage pipeline 1 is connected with the opening and closing valve one 2, and the furnace water energy storage pipeline 9 is connected with the opening and closing valve three 8; the communication valve 7 is connected between multiple heat storage tanks, used to adjust the pressure in the balance tank; the safety valve 10 is arranged to ensure the safety of the pressure in the tank; the valve two 3 is arranged on the furnace water energy release pipeline 5, used to adjust the flow of saturated water entering the outlet of the deaerator 37; the valve four 13 is arranged on the steam energy release pipeline 12, used to adjust the flow of saturated steam entering the feedwater heat exchanger 15; the valve five 16 is arranged on the high-pressure feedwater bypass 14, used to adjust the flow of feedwater flowing into the high-pressure feedwater bypass 14.
[0046] The opening and closing valve three 8 is arranged in the energy storage pipeline connecting the feedwater system and the high-quality furnace water heat storage device, and the opening and closing valve one 2 is arranged in the energy storage pipeline connecting the high-pressure cylinder extraction steam and the high-quality furnace water heat storage device; the opening and closing valve one 2 and the opening and closing valve three 8 are in an open state during the heat storage stage, so that the working medium of the feedwater system and the high-temperature extraction steam are communicated with the high-quality furnace water heat storage device through the energy storage pipeline and heat preservation is realized.
[0047] The valve two 3 and the valve four 13 are arranged on the furnace water energy release pipeline, and the valve five 16 is arranged on the high-pressure feedwater bypass; the valve two 3, the valve four 13 and the valve five 16 are in an open state during the period of rapid load increase and peak regulation; the energy release pipeline 12 of the heat storage tank is connected with the deaerator 37 (or the heat user 38) after the energy release is completed; the high-pressure feedwater bypass 14 enters the mixer 17 after being heated in the feedwater heat exchanger 15, mixes with the feedwater in the original high-pressure feedwater pipeline 18 to maintain the temperature of the feedwater, and the required extraction steam of the high-pressure heater 40 is correspondingly reduced.
[0048] Embodiment two (direct mixing and heating mode of heat storage tank)
[0049] AsFigure 2 As shown, this embodiment is basically the same as Embodiment 1, except that in the energy storage process described in this embodiment, steam and water are stored through a mixing heater 6, so there is no energy storage pipeline outlet. The rest of the specific process is the same as in Embodiment 1. The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make many modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.
Claims
1. A rapid and flexible peak-shaving and frequency regulation system for coal-fired power units based on high-temperature working fluid storage / power supply, characterized in that, The system includes a coal-fired power unit thermal cycle system and a high-temperature working fluid storage / energy supply system. The high-temperature working fluid storage / energy supply system is deeply coupled with the coal-fired power unit thermal cycle system. By reducing the steam extraction rate of each stage of the turbine in the thermal cycle system, it rapidly improves the work capacity of the coal-fired power unit, thereby increasing the unit's ramp-up rate. Simultaneously, the high-temperature working fluid storage / energy supply system directly acts on the feedwater regeneration system in the thermal cycle system. The high-enthalpy working fluid in the high-temperature working fluid storage / energy supply system heats the feedwater in the feedwater regeneration system, increasing the boiler feedwater temperature and thus improving the boiler steam yield. This enhances the coal-fired power unit's ability to respond quickly to load changes.
2. The rapid and flexible peak-shaving and frequency regulation system for coal-fired power units based on high-temperature working fluid storage / power supply according to claim 1, characterized in that, The thermal cycle system of the coal-fired unit includes a boiler, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a condenser, a heater, and a feedwater heat exchanger; wherein the heater includes a high-pressure heater, a deaerator, and a low-pressure heater. The extraction steam outlet of the high-pressure cylinder of the steam turbine is directed to the hot end inlet of the high-pressure heater, while the extraction steam outlet of the intermediate-pressure cylinder is directed to the hot end inlet of the high-pressure heater and the inlet of the deaerator, respectively. The extraction steam from the outlet of the low-pressure cylinder flows to the remaining hot end inlet of the low-pressure heater. These extraction steam and condensate flow sequentially through the hot end inlets of the high-pressure heater, the deaerator, and the low-pressure heater, and the hot ends of each heater are connected in series. The condenser outlet is connected to the cold end inlet of the last stage low-pressure heater, while the cold end outlet of the highest stage high-pressure heater is connected to the inlet of the boiler economizer. The cold ends of the low-pressure heaters and the high-pressure heaters are also connected in series. The low-pressure heaters are connected to the high-pressure heaters through the deaerator. A feedwater-high-pressure heater bypass is provided at the deaerator outlet. The feedwater-high-pressure heater bypass is equipped with a gate valve and a regulating valve. Part of the high-pressure feedwater serves as a cold source and flows into the feedwater heat exchanger through the gate valve and the regulating valve.
3. The rapid and flexible peak-shaving and frequency regulation system for coal-fired power units based on high-temperature working fluid storage / power supply according to claim 2, characterized in that, The high-temperature working fluid storage / supply system includes a heat storage tank, energy storage pipelines, energy release pipelines, and valves; The heat storage tank is equipped with a water-steam heat exchanger. The steam extracted from the coal-fired unit is connected to the hot end inlet of the water-steam heat exchanger; the hot end outlet of the water-steam heat exchanger is connected to the deaerator; the energy release pipeline of the heat storage tank is connected to the hot end inlet of the feedwater heat exchanger on the feedwater-high pressure heater bypass; and the hot end outlet of the feedwater heat exchanger is connected to the deaerator.
4. The rapid and flexible peak-shaving and frequency regulation system for coal-fired power units based on high-temperature working fluid storage / power supply according to claim 2, characterized in that, The high-temperature working fluid storage / supply system includes heat storage pipes, energy storage pipelines, energy release pipelines, and valves; The heat storage tank is equipped with a water-steam heat exchanger. The steam extracted from the coal-fired unit is connected to the hot end inlet of the water-steam heat exchanger; the hot end outlet of the water-steam heat exchanger is connected to the heating user; the energy release pipeline of the heat storage tank is connected to the hot end inlet of the feedwater heat exchanger on the feedwater-high pressure heater bypass; the hot end outlet of the feedwater heat exchanger is connected to the heating user.
5. The rapid and flexible peak-shaving and frequency regulation system for coal-fired power units based on high-temperature working fluid storage / power supply according to claim 3 or 4, characterized in that, The water-steam heat exchanger is an indirect heat exchanger.
6. The rapid and flexible peak-shaving and frequency regulation system for coal-fired power units based on high-temperature working fluid storage / power supply according to claim 3 or 4, characterized in that, The water-steam heat exchanger is a heat exchanger that uses a direct mixing method for heat exchange.