CN219570167U - Thermal power plant unit degree of depth peak shaving system - Google Patents
Thermal power plant unit degree of depth peak shaving system Download PDFInfo
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- CN219570167U CN219570167U CN202320354217.7U CN202320354217U CN219570167U CN 219570167 U CN219570167 U CN 219570167U CN 202320354217 U CN202320354217 U CN 202320354217U CN 219570167 U CN219570167 U CN 219570167U
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Abstract
The utility model provides a thermal power plant unit depth peak shaving system, which comprises: the heat storage system comprises a main steam diverter valve, a cold heat storage medium storage tank, a cold heat storage medium pump, a steam-heat storage medium heat exchanger and a heat storage medium storage tank; the heat release system comprises a heat storage medium pump, a heat storage medium-high-pressure feed water heater, a heat storage medium flow divider valve and a heat storage medium-low-pressure feed water heater. When the low load depth peak of the original unit of the thermal power plant is regulated, and in the period of increasing load of a power grid or a user, the problem that the work load range of the unit is enlarged and the minimum load is reduced when the power grid is required to increase the variable load rate is solved through the cooperation among the thermodynamic system, the heat storage system and the heat release system, and the unit can be ensured to stably run under extremely low load.
Description
Technical Field
The utility model relates to the technical field of steam depth peak regulation of thermal power plants, in particular to a depth peak regulation system of thermal power plants.
Background
With the rapid increase of the proportion of new energy sources such as wind energy, solar energy and the like in the power grid of China, and under the aim of realizing carbon neutralization, higher requirements are put forward on the power generation duty ratio and the consumption of the new energy sources, and the peak shaving contradiction of the power grid is increasingly prominent.
The thermal power generating unit accounts for more than half of the capacity of the whole assembly machine in China, and the specific gravity of the generated energy of coal electricity accounts for the total generated energy of the whole caliber is close to six; while thermal power projects will be installed in a short period of time, the old energy source represented by thermal power will exit the market in a long period of time, which is still an unchangeable trend. However, the form of thermal power withdrawal can not be the form of 'once detached and once stopped', so that the thermal power flexibility is improved, the function of the thermal power ballast is played, and the final homing of the thermal power is realized.
The peak regulation capability of the thermal power generating unit plays a key role in the safe operation of the power grid. Coal-fired units are required to expand their operating load range while increasing the rate of load change, and in particular, to reduce the minimum generated power, i.e., the minimum load. The strong coupling between the boiler and the steam turbine of the traditional thermodynamic system unit limits the lowest output of the coal-fired power generation unit, so that the deep peak regulation function of the thermal power plant unit cannot be realized.
Disclosure of Invention
Therefore, the utility model aims to overcome the defect that the thermal power plant unit cannot realize the deep peak regulation function because the minimum output of the coal-fired power generation unit is limited by strong coupling between the boiler and the steam turbine of the thermal power system unit in the prior art, thereby providing the deep peak regulation system of the thermal power plant unit.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the embodiment of the utility model provides a thermal power plant unit depth peak shaving system, which comprises a thermodynamic system, wherein the thermodynamic system comprises: boiler, steam turbine high pressure cylinder, steam turbine intermediate pressure cylinder, steam turbine low pressure cylinder, condensing equipment, low pressure heater, deaerator, the high pressure heater that connects gradually, thermal power plant unit degree of depth peak shaver system still includes: a heat storage system and a heat release system, wherein,
the heat storage system comprises a main steam flow dividing valve, a cold heat storage medium storage tank, a cold heat storage medium pump, a steam-heat storage medium heat exchanger and a heat storage medium storage tank, wherein the steam-heat storage medium heat exchanger is connected with a superheater pipeline in the boiler through the main steam flow dividing valve, part of high-pressure main steam coming out of a superheater of the boiler enters a turbine high-pressure cylinder to do work, the other part of the high-pressure main steam enters the steam turbine high-pressure cylinder to do work, the cold heat storage medium storage tank is connected with the steam-heat storage medium heat exchanger through the cold heat storage medium pump, the heat storage medium in the cold heat storage medium storage tank enters the steam-heat storage medium heat exchanger through the cold heat storage medium pump to exchange heat with high-temperature steam, and the heated heat storage medium flows into the heat storage medium storage tank to be stored;
the heat release system comprises a heat storage medium pump, a heat storage medium-high pressure feed water heater, a heat storage medium flow dividing valve and a heat storage medium-low pressure feed water heater, wherein the heat storage medium-high pressure feed water heater is connected into a high pressure heater bypass, the heat storage medium-low pressure feed water heater is connected into a low pressure heater bypass, the heat storage medium storage tank is connected with the heat storage medium-high pressure feed water heater through the heat storage medium pump, the heat storage medium storage tank is sequentially connected with the heat storage medium-low pressure feed water heater through the heat storage medium pump and the heat storage medium flow dividing valve, the heat storage medium-high pressure feed water heater and the heat storage medium-low pressure feed water heater are connected with the cold storage medium storage tank, the heat storage medium flow flowing out of the heat storage medium storage tank is regulated through the heat storage medium pump, one part of the heat storage medium enters the heat storage medium-high pressure feed water heater, the other part of the heat storage medium enters the heat storage medium-low pressure feed water heater through the heat storage medium flow dividing valve to be respectively heat exchanged with the feed water, and the heat storage medium after heat exchange is returned to the heat storage medium storage tank for storage.
Optionally, the heat storage system further comprises: the system comprises a No. 1 flash tank and a No. 2 flash tank, wherein high-temperature steam entering the steam heat storage medium heat exchanger and water generated by heat exchange of heat storage medium in the cold heat storage medium storage tank enter the No. 1 flash tank, and the No. 1 flash tank mixes the steam obtained by flash evaporation with steam discharged from the high-pressure cylinder through a steam pipeline and returns to the reheater for heating;
the No. 1 flash tank is used for enabling water obtained through flash evaporation to enter the No. 2 flash tank for flash evaporation again, and the No. 2 flash tank is used for enabling the steam obtained through flash evaporation to be mixed with the steam for deoxidizing the middle pressure cylinder of the steam turbine through a steam pipeline and enter the deoxidizer.
Optionally, the heat storage system is started when the thermal power plant unit runs at low load and deep peak shaving is required.
Optionally, the exothermic system is started when the thermal power plant needs to be operated with a rapid increase in load.
Optionally, the heat storage medium-low pressure feed water heater and the heat storage medium-high pressure feed water heater are both selected to be operated or only the heat storage medium-high pressure feed water heater is selected to be operated by controlling the heat storage medium split valve and the low pressure heater inlet bypass regulating valve.
Optionally, the heat storage medium is a single-phase flowing medium such as molten salt.
Optionally, the low-pressure heater bypass further comprises a low-pressure heater inlet bypass regulating valve.
Optionally, the high-pressure heater bypass further comprises a high-pressure heater inlet bypass regulating valve.
The technical scheme of the utility model has the following advantages:
according to the deep peak regulation system of the thermal power plant unit, when the low-load deep peak regulation of the original thermal power plant unit is performed, the heat storage medium is heated by utilizing high-temperature steam and part of heat is stored, the on-line electric quantity of the thermal power plant unit is reduced through the energy storage process, peak regulation energy supply of the thermal power plant unit is realized, and the problem that the low-limit load of the boiler is not matched with the low-limit load of the steam turbine is solved. And in the period of the power grid or the load increase required by the user, the energy stored by the heat storage medium is utilized to externally generate power and supply heat. The two processes solve the problems that when the power grid requires the unit to increase the variable load rate, the working load range of the unit is enlarged and the minimum load is reduced, realize thermal decoupling and ensure that the unit can stably operate with extremely low load.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of main equipment and principle of a thermal power plant unit depth peak shaving system in an embodiment of the utility model.
Reference numerals illustrate:
the system comprises a boiler 1, a steam turbine high-pressure cylinder 2, a steam turbine medium-pressure cylinder 3, a steam turbine low-pressure cylinder 4, condensing equipment 5, a condensate pump 6, a low-pressure heater 7, a deaerator 8, a water supply pump 9, a high-pressure heater 10, a low-pressure heater inlet bypass regulating valve 11, a high-pressure heater inlet bypass regulating valve 12, a main steam splitter valve 13, a cold heat storage medium storage tank 14, a cold heat storage medium pump 15, a steam-heat storage medium heat exchanger 16, a heat storage medium storage tank 17, a No. 1 flash tank 18, a No. 2 flash tank 19, a heat storage medium pump 20, a heat storage medium-high-pressure water supply heater 21, a heat storage medium splitter valve 22 and a heat storage medium-low-pressure water supply heater 23.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
The minimum output of the coal-fired power generation unit is limited due to the strong coupling between the boiler and the steam turbine of the existing thermodynamic system unit. Thus, for pure condensing units-depth peaking adaptation: mainly on optimizing the starting and stopping time and the depth of the variable load speed; thermoelectric unit-thermoelectric decoupling: the flexibility target is mainly thermal decoupling, and the method for ensuring the unit to stably operate under extremely low load is provided.
Therefore, the embodiment of the utility model provides a thermal power plant unit deep peak shaving system, which comprises a thermodynamic system of an original thermal power plant generator unit. As shown in fig. 1, the thermodynamic system includes: the boiler 1, the steam turbine high-pressure cylinder 2, the steam turbine medium-pressure cylinder 3, the steam turbine low-pressure cylinder 4, the condensing equipment 5, the low-pressure heater 7, the deaerator 8 and the high-pressure heater 10 are connected in sequence. Further, the thermodynamic system also comprises a condensate pump 6 and a feed water pump 9.
In a specific embodiment, the high-pressure main steam from the superheater in the boiler 1 enters the high-pressure cylinder 2 of the steam turbine to do work, and the cold-stage steam after doing work returns to the reheater in the boiler 1 to be reheated. The hot-stage steam from the reheater enters a middle pressure cylinder 3 of the steam turbine to do work. The turbine intermediate pressure cylinder 3 is connected with the turbine low pressure cylinder 4, and exhaust steam from the turbine intermediate pressure cylinder 3 enters the turbine low pressure cylinder 4 to continue to apply work. The high-speed flowing steam drives the blades of the steam turbine to rotate so as to drive the generator to generate electricity.
To increase the thermal efficiency, some of the steam that is subjected to work is typically extracted from some intermediate stage of the turbine to heat the feedwater. Specifically, during the steam expansion process, the steam pressure and temperature are continuously reduced, and finally discharged into the condensing equipment 5 and cooled by cooling water to condense into water. Condensed water is concentrated at the lower part of condensing equipment 5 and pumped to a low-pressure heater 7 and a deaerator 8 by a condensed water pump 6, and is pumped into a high-pressure heater 10 for heating by a water supply pump 9 after being heated and deoxidized, and finally pumped into a boiler 1.
In one embodiment, as shown in fig. 1, the thermal power plant unit depth peak shaving system further includes: a heat storage system and a heat release system.
The heat storage system comprises a main steam flow dividing valve 13, a cold heat storage medium storage tank 14, a cold heat storage medium pump 15, a steam-heat storage medium heat exchanger 16 and a heat storage medium storage tank 17. The steam-heat storage medium heat exchanger 16 is connected with a superheater pipeline in the boiler 1 through a main steam flow dividing valve 13, a part of high-pressure main steam from the superheater of the boiler 1 enters the high-pressure cylinder 2 of the steam turbine to do work, and the rest enters the steam heat storage medium heat exchanger 16. The cold heat storage medium storage tank 14 is connected with the steam-heat storage medium heat exchanger 16 through the cold heat storage medium pump 15, the heat storage medium storage tank 17 is connected with the steam-heat storage medium heat exchanger 16, the heat storage medium in the cold heat storage medium storage tank 14 enters the steam-heat storage medium heat exchanger 16 through the cold heat storage medium pump 15 to exchange heat with high-temperature steam, and the heated heat storage medium flows into the heat storage medium storage tank 17 to be stored.
The heat release system comprises a heat storage medium pump 20, a heat storage medium-high pressure feedwater heater 21, a heat storage medium diverter valve 22, and a heat storage medium-low pressure feedwater heater 23. The high-pressure heater bypass is connected to the high-pressure feed water heater 21, and the low-pressure heater bypass is connected to the low-pressure feed water heater 23. The heat storage medium storage tank 17 is connected with a heat storage medium-high-pressure feed water heater 21 through a heat storage medium pump 20, and the heat storage medium storage tank 17 is connected with a heat storage medium-low-pressure feed water heater 23 through the heat storage medium pump 20 and a heat storage medium flow dividing valve 22 in sequence. The heat storage medium-high-pressure feed water heater 21 and the heat storage medium-low-pressure feed water heater 23 are connected to the cold heat storage medium reservoir 14. The flow rate of the heat storage medium flowing out of the heat storage medium storage tank 17 is regulated by the heat storage medium pump 20, one part of the heat storage medium enters the heat storage medium-high-pressure feed water heater 21, the other part of the heat storage medium enters the heat storage medium-low-pressure feed water heater 23 through the heat storage medium flow dividing valve 22 to exchange heat with the feed water respectively, and the heat storage medium after heat exchange returns to the cold heat storage medium storage tank 14 to be stored.
In a specific embodiment, the heat storage system further comprises: a flash tank No. 1 18, a flash tank No. 2 19. The high-temperature steam entering the steam heat storage medium heat exchanger 16 exchanges heat with the heat storage medium in the cold heat storage medium storage tank 14 to generate water, the water enters the No. 1 flash tank 18, the No. 1 flash tank 18 mixes the steam obtained by flash evaporation with the steam discharged by the high-pressure cylinder 2 through a steam pipeline, and the steam returns to the reheater for heating. The water obtained by flash evaporation in the No. 1 flash tank 18 enters the No. 2 flash tank 19 for flash evaporation again, the steam obtained by flash evaporation in the No. 2 flash tank 19 is mixed with the steam for deoxidization in the middle pressure cylinder 3 of the steam turbine through a steam pipeline, and the steam enters the deoxidizer 8.
In the embodiment of the utility model, when the thermal power plant unit runs at low load and requires deep peak shaving, the heat storage system is started. Specifically, the hot water side of the heat storage system: part of high-pressure main steam from a superheater of the boiler 1 enters a turbine high-pressure cylinder 2 to do work, the rest part enters a steam heat storage medium heat exchanger 16 and is condensed into water with the temperature close to saturation, the water enters a No. 1 flash tank 18, the pressure of the flash tank is controlled, the pressure of the flash-evaporated steam is matched with the pressure of the steam discharged from the high-pressure cylinder, the steam is connected with the steam discharged from the turbine high-pressure cylinder 2 through a steam pipeline and mixed with the steam discharged from the turbine high-pressure cylinder 2, and the mixture returns to the reheater to be heated; the water after flash evaporation enters a No. 2 flash evaporation tank 19 for further flash evaporation, the pressure of the flash evaporation tank is controlled, the pressure of the steam after flash evaporation is matched with the pressure of the steam extracted by the deaerator 8 removed by the middle pressure cylinder 3 of the steam turbine, the steam is mixed with the steam used for deoxidizing by the middle pressure cylinder 3 of the steam turbine through the connection of a steam pipeline, the water enters the deaerator 8, the water after flash evaporation is mixed with the low added water supply through the pipeline, the deaerator 8 is used for deoxidizing, and the water supply system is returned.
Side of heat storage medium: the outlet regulating valve of the cold heat storage medium storage tank 14 is opened, the cold heat storage medium pump 15 is started, the flow of the heat storage medium flowing out of the cold heat storage medium storage tank 14 is regulated by the cold heat storage medium pump 15, the heat storage medium enters the steam-heat storage medium heat exchanger 16 to exchange heat with high-temperature steam, and the heated heat storage medium flows into the heat storage medium storage tank 17 to be stored, so that the energy storage of the high-pressure steam is realized. Under the heat storage working condition, the redundant high-pressure steam is stored and released when needed, so that the energy waste is avoided.
The flow of the heat storage medium entering the steam-heat storage medium heat exchanger is regulated by a cold heat storage medium pump, the heat storage medium absorbs the heat of the superheated steam in the steam-heat storage medium heat exchanger, and the energy storage of the high-pressure steam is realized by a heat storage system; the output power of the boiler and the power generation power of the turbine set are decoupled, so that the set can stably run under extremely low load, and the requirement of a power grid on the set depth peak regulation capacity is met. Meanwhile, high-temperature saturated water subjected to heat exchange in the heat storage medium is further subjected to flash evaporation in the flash evaporation tank, the flash evaporated steam is connected with high-pressure cylinder exhaust steam through a steam pipeline and mixed, and the steam is returned to the boiler reheater for heating, so that the reheat steam flow is improved, the high-pressure steam flow and medium-pressure steam flow of the reheat unit are organically combined, the overtemperature of the reheater is avoided, and the safety operation capacity of the boiler in a low-load peak shaving stage is improved.
Further, when the thermal power plant unit needs to rapidly increase load operation, the heat release system is started. Specifically, the exothermic system media side: starting a heat storage medium pump 20, and regulating the flow of the high-temperature heat storage medium flowing out of a heat storage medium storage tank 17 through the heat storage medium pump 20, wherein a part of the high-temperature heat storage medium enters a heat storage medium-high-pressure feed water heater 21; the other part of the heat storage medium enters the heat storage medium-low-pressure feed water heater 23 through the hot heat storage medium flow dividing valve 22 to exchange heat with the feed water respectively, and the heat storage medium after heat exchange returns to the cold heat storage medium storage tank 14 to be stored.
Steam side: the low-pressure heater inlet bypass regulating valve 11 in the low-pressure heater bypass and the high-pressure heater inlet bypass regulating valve 12 in the high-pressure heater bypass are opened, the water working medium is heated in the heat storage medium-low-pressure feed water heater 23 and the heat storage medium-high-pressure feed water heater 21 respectively, and the heated water working medium flows into the boiler 1. The opening of the low-pressure heater inlet bypass regulating valve 11 and the opening of the high-pressure heater inlet bypass regulating valve 12 are used for regulating the flow of water working media entering the heat storage medium, the heat storage medium-low-pressure feed water heater 23 and the heat storage medium-high-pressure feed water heater 21, and the regulation targets are as follows: the steam quantity flowing into the steam turbine is rapidly increased, and the variable load rate of the coal-fired generator set is improved. Under the heat release working condition, the stored heat is released, so that the steam quantity flowing into the steam turbine is increased, the heat input of the power generation system is increased, and the generated energy is improved.
In the embodiment of the utility model, the heat storage medium is a single-phase flowing medium such as molten salt.
In an embodiment, by controlling the heat storage medium split valve 22 and the low pressure heater inlet bypass regulating valve 11, both the heat storage medium-low pressure feedwater heater 23 and the heat storage medium-high pressure feedwater heater 21 are selected to be put into operation, or only the heat storage medium-high pressure feedwater heater 21 is put into operation.
In a specific embodiment, in the actual operation process, the heat storage medium-low pressure feedwater heater 23 and the heat storage medium-high pressure feedwater heater 21 can be selected to be respectively put into operation or only put into the heat storage medium-high pressure feedwater heater 21 by controlling the heat storage medium split valve 22 and the low pressure heater inlet bypass regulating valve 11 according to the load requirement of the depth adjustment of the unit and the actual condition of the unit.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications in form will be apparent to persons skilled in the art upon the description hereinabove. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (8)
1. A thermal power plant unit depth peaking system, comprising a thermodynamic system, the thermodynamic system comprising: boiler (1), steam turbine high pressure cylinder (2), steam turbine intermediate pressure cylinder (3), steam turbine low pressure cylinder (4), condensing equipment (5), low pressure heater (7), deaerator (8), high pressure heater (10) that connect gradually, its characterized in that, thermal power plant unit degree of depth peak shaver system still includes: a heat storage system and a heat release system, wherein,
the heat storage system comprises a main steam flow dividing valve (13), a cold heat storage medium storage tank (14), a cold heat storage medium pump (15), a steam-heat storage medium heat exchanger (16) and a hot heat storage medium storage tank (17), wherein the steam-heat storage medium heat exchanger (16) is connected with a superheater pipeline in the boiler (1) through the main steam flow dividing valve (13), a part of high-pressure main steam coming out of a superheater of the boiler (1) enters a steam turbine high-pressure cylinder (2) to do work, the rest part enters the steam-heat storage medium heat exchanger (16), the cold heat storage medium storage tank (14) is connected with the steam-heat storage medium heat exchanger (16) through the cold heat storage medium pump (15), the hot heat storage medium storage tank (17) is connected with the steam-heat storage medium heat exchanger (16), and the heat storage medium in the cold heat storage medium storage tank (14) enters the steam-heat medium heat exchanger (16) through the cold heat storage medium pump (15) to perform heat exchange with high-temperature steam, and the heated heat storage medium flows into the hot medium storage tank (17) to store;
the heat release system comprises a heat storage medium pump (20), a heat storage medium-high-pressure feed water heater (21), a heat storage medium shunt valve (22) and a heat storage medium-low-pressure feed water heater (23), wherein the heat storage medium-high-pressure feed water heater (21) is connected into a high-pressure heater bypass, the heat storage medium-low-pressure feed water heater (23) is connected into a low-pressure heater bypass, the heat storage medium storage tank (17) is connected with the heat storage medium-high-pressure feed water heater (21) through the heat storage medium pump (20), the heat storage medium storage tank (17) is sequentially connected with the heat storage medium-low-pressure feed water heater (23) through the heat storage medium pump (20), the heat storage medium-high-pressure feed water heater (21) and the heat storage medium-low-pressure feed water heater (23) are connected with the cold storage medium storage tank (14), one part of the medium flow of the heat storage medium flowing out of the heat storage medium storage tank (17) is regulated through the heat storage medium pump (20), the heat storage medium enters the heat storage medium-high-pressure feed water heater (21) through the heat storage medium shunt valve (22) and the heat storage medium-low-pressure feed water heater (23) respectively, and the heat-exchanged heat storage medium returns to the cold heat storage medium storage tank (14) for storage.
2. The thermal power plant unit depth peaking system of claim 1, wherein the thermal storage system further comprises: a No. 1 flash tank (18) and a No. 2 flash tank (19), wherein high-temperature steam entering the steam-heat storage medium heat exchanger (16) and water generated by heat exchange of heat storage medium in the cold heat storage medium storage tank (14) enter the No. 1 flash tank (18), and the No. 1 flash tank (18) mixes the steam obtained by flash evaporation with steam discharged from the high-pressure cylinder (2) through a steam pipeline and returns to the reheater for heating;
the No. 1 flash tank (18) is used for enabling the water obtained through flash evaporation to enter the No. 2 flash tank (19) for flash evaporation again, and the No. 2 flash tank (19) is used for enabling the steam obtained through flash evaporation to be mixed with the steam for deoxidizing by the steam turbine medium pressure cylinder (3) through a steam pipeline and enter the deoxidizer (8).
3. The thermal power plant unit deep peaking system of claim 2, wherein the thermal storage system is activated when thermal power plant unit low load is operating at low load and deep peaking is required.
4. The thermal power plant unit depth peaking system of claim 1, wherein the exothermic system is activated when the thermal power plant unit needs to be rapidly load-up.
5. The thermal power plant unit depth peaking system of claim 1, further comprising a low pressure heater inlet bypass regulator valve (11) in the low pressure heater bypass.
6. The thermal power plant unit depth peaking system according to claim 5, characterized in that by controlling the heat storage medium shunt valve (22) and the low pressure heater inlet bypass regulating valve (11), both the heat storage medium-low pressure feedwater heater (23) and the heat storage medium-high pressure feedwater heater (21) are selected to be put into operation, or only the heat storage medium-high pressure feedwater heater (21) is put into operation.
7. The thermal power plant unit depth peak shaving system according to claim 1, wherein the heat storage medium is a medium flowing in a single phase such as molten salt.
8. The thermal power plant unit depth peaking system of claim 1, further comprising a high pressure heater inlet bypass regulator valve (12) in the high pressure heater bypass.
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