CN220288341U - Fused salt energy storage system for stepped heat storage of thermal power plant - Google Patents
Fused salt energy storage system for stepped heat storage of thermal power plant Download PDFInfo
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- 150000003839 salts Chemical class 0.000 title claims abstract description 283
- 238000004146 energy storage Methods 0.000 title claims abstract description 40
- 238000005338 heat storage Methods 0.000 title claims abstract description 24
- 238000000605 extraction Methods 0.000 claims abstract description 63
- 238000010248 power generation Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 71
- 238000003303 reheating Methods 0.000 claims description 30
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003657 drainage water Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model relates to a stepped heat storage molten salt energy storage system of a thermal power plant, which is characterized in that the stepped heat storage design is adopted, the molten salt energy storage system can utilize steam extraction of a steam turbine step by step to heat energy, in the heat storage stage, the molten salt is heated by steam extraction of each stage, so that the temperature is gradually increased, the stepped heating mode can maximally utilize the heat energy, the heat energy utilization efficiency is improved, the flexibility of a power generation system is improved, the power generation system can better adapt to the change of the demand of the power system, the load of the boiler is increased by inputting superheated steam heated by hot molten salt into a low-temperature reheat steam inlet of the boiler, and the peak load-shedding capacity of the thermal power plant is improved, so that the system can rapidly increase the power generation load during the peak of the power demand, and the demand of a power grid is met.
Description
Technical Field
The utility model relates to the technical field of thermal power generation, in particular to a fused salt energy storage system for stepped heat storage of a thermal power plant.
Background
In recent years, along with the national promotion of clean energy, the carbon peak is reached before 2030 and the carbon neutralization is realized before 2060, the total capacity of the photovoltaic power generation and wind power generation 2023 is up to 26.8%, but the new energy power generation is influenced by day and weather, the generated energy has fluctuation and intermittent influence, the impact is caused on a power grid, the thermal power generating unit is required to cut peaks and fill valleys, and the conditions of wind and light abandoning are avoided.
The peak regulation of the thermal power plant reduces the load of the steam turbine generator by reducing the load of the boiler, but the minimum stable combustion limit (such as 30% of the rated load of the boiler of the solid slag discharging furnace) exists in the boiler, and along with the development of an energy storage technology, the energy storage technology is combined with the thermal power plant, so that the power generation capacity of the power plant can be further reduced, the peak regulation is further carried out on the power plant, and the flexibility of the power plant is improved.
The thermal power plant has various energy storage modes (such as electric energy storage and hot water energy storage), and the fused salt energy storage has the advantages of large capacity, long period, wide temperature range, low cost and the like. The existing molten salt energy storage technology is to extract one path of main steam and high-temperature reheat steam from the main steam and the high-temperature reheat steam to a molten salt heater respectively, and heat exchange is completedThe steam condensate enters high-pressure water supply, and the high-temperature reheat steam enters low-temperature reheat steam after heat exchange or becomes condensate to enter a deaerator for recovery. Although the scheme solves the energy storage problem, the high-grade energy is utilized for heating, resulting inIs a loss of (2).
Disclosure of Invention
In order to solve the problems, the utility model provides the stepped heat storage molten salt energy storage system of the thermal power plant, which is used for carrying out stepped heating on molten salt by a method for extracting steam step by step from a high-medium pressure cylinder of a steam turbine, so that heat energy can be more fully utilized, energy loss is reduced, and the overall efficiency of the system is improved
In order to achieve the above purpose, the utility model provides a stepped heat storage molten salt energy storage system for a thermal power plant, comprising:
the power generation system comprises a boiler, a steam turbine, a generator, a condenser, a condensate pump, a low-pressure heater, a deaerator, a high-pressure heat release water supply pump and a high-pressure heater group; the steam turbine comprises a high-medium pressure cylinder and a low-pressure cylinder, and the high-medium pressure cylinder and the low-pressure cylinder are mechanically connected with the generator through a motor; the main steam outlet of the boiler is connected to the inlet of the high-medium pressure cylinder, and the outlet of the high-medium pressure cylinder is connected to the low-temperature reheating steam inlet of the boiler; the reheat steam heated by the boiler is connected to the inlet of the low-pressure cylinder from the high-temperature reheat steam outlet of the boiler, and the outlet of the low-pressure cylinder is connected to the condenser; each stage of the high-medium pressure cylinder is sequentially connected with a first steam extraction branch pipe, a second steam extraction branch pipe and a third steam extraction branch pipe, and the high-pressure heater group comprises a first high-pressure heater connected to the first steam extraction branch pipe, a second high-pressure heater connected to the second steam extraction branch pipe and a third high-pressure heater connected to the third steam extraction branch pipe; each stage of the low-pressure cylinder is sequentially provided with a fourth steam extraction branch pipe connected to the deaerator and a fifth steam extraction branch pipe connected to the low-pressure heat exchanger; the condensed water of the condenser is sequentially connected to the low-pressure heater and the deaerator through a condensed water pump, condensed water subjected to heat exchange and temperature rise through the low-pressure heater and the deaerator is sequentially connected to the first high-pressure heater, the second high-pressure heater and the third high-pressure heater through a high-pressure heat release water supply pump, and is connected to a water supply mouth of the boiler after subjected to heat exchange and temperature rise through the first high-pressure heater, the second high-pressure heater and the third high-pressure heater; the low-pressure condensate formed by heat exchange of the first high-pressure heater, the second high-pressure heater and the third high-pressure heater is connected to a water feeding mouth of the deaerator through a pipeline;
the molten salt energy storage system sequentially exchanges heat with the steam of the first steam extraction branch pipe, the second steam extraction branch pipe and the third steam extraction branch pipe through molten salt when storing heat, so that heat storage is realized;
the molten salt heat release system is connected between the water outlet of the deaerator and the low-temperature reheat steam inlet of the boiler, and when releasing heat, the molten salt heat release system converts the water discharged from the deaerator into hot steam by utilizing the heat stored by the molten salt energy storage system and conveys the hot steam to the low-temperature reheat steam inlet of the boiler, so that heat release is realized.
The molten salt energy storage system comprises a first molten salt heater, a second molten salt heater, a third molten salt heater, a cold salt tank, a cold salt pump, a hot salt tank and a hot salt pump; the first steam extraction branch pipe is connected with the steam inlet of the first molten salt heater in a branch way, the second steam extraction branch pipe is connected with the steam inlet of the second molten salt heater in a branch way, and the third steam extraction branch pipe is connected with the steam inlet of the third molten salt heater in a branch way; the cold molten salt in the cold salt tank is sequentially connected to the first molten salt heater, the second molten salt heater and the third molten salt heater through the cold salt pump to be heated, and the hot molten salt which is sequentially heated by the first molten salt heater, the second molten salt heater and the third molten salt heater is connected to a molten salt inlet of the hot salt tank to realize heat storage; the hot molten salt in the cold salt tank is conveyed to a molten salt heat release system through a hot salt pump, and is connected to a molten salt inlet of the cold salt tank after being subjected to heat exchange and cooling through the molten salt heat release system, so that heat release is realized.
The molten salt heat release system comprises a heat release water supply pump, a preheater, an evaporator, a superheater and a steam drum; the hot molten salt in the hot salt tank is sequentially connected to molten salt inlets of the superheater, the evaporator and the preheater through a hot salt pump, and is connected to a molten salt inlet of the cold salt tank after heat exchange and cooling of the heater, the evaporator and the preheater; the water outlet of the deaerator is divided into a branch which is connected to a heat release water supply pump, the branch is pressurized by the heat release water supply pump and then connected to the water inlet of the preheater, and the water supply preheated by the preheater is connected to the steam drum; boiler water enters an evaporator through a down pipe, and is heated by hot molten salt in the evaporator to form saturated steam which enters a steam drum through a rising pipe; the air outlet end of the steam drum is connected to the superheater, and superheated steam is heated into hot molten salt in the superheater and is conveyed to a low-temperature reheat steam inlet of the boiler, so that heat release is realized.
The low-temperature reheating molten salt heater comprises a main steam outlet, a low-temperature reheating molten salt heater and a high-pressure condensate pressurizing pump, wherein the main steam outlet of the boiler is divided into a steam inlet of the main steam molten salt heater, and the low-temperature reheating steam inlet of the boiler is divided into a steam inlet of the reheating molten salt heater; the molten salt subjected to heat exchange by the third molten salt heater is divided into two paths which are respectively connected to the molten salt inlets of the main steam molten salt heater and the reheating molten salt heater, and is subjected to heat exchange by the main steam molten salt heater and the reheating molten salt heater and then connected to the molten salt inlet of the hot salt tank; the high-pressure condensate formed by heat exchange of the main steam molten salt heater is connected to a water supply mouth of any one of the first high-pressure heater, the second high-pressure heater and the third high-pressure heater through a high-pressure condensate pressurizing pump; the medium-pressure condensate formed by heat exchange of the reheating molten salt heater is connected to a water feeding mouth of the deaerator through a pipeline.
Still further, the molten salt outlet of the reheating molten salt heater is provided with a molten salt temperature regulating valve for regulating the temperature of the molten salt after heat exchange of the reheating molten salt heater to be consistent with the temperature of the molten salt after heat exchange of the main steam molten salt heater.
According to the stepped heat storage molten salt energy storage system for the thermal power plant, disclosed by the utility model, the molten salt is heated in a grading manner by a step-by-step steam extraction method of a high-medium pressure cylinder of a steam turbine, and the drainage water after the upper-level heat exchange is continuously heated in a lower-level heater, so that the loss of energy and heat is effectively reduced, and the utilization efficiency of a thermal power generator set in the energy storage process is improved.
Drawings
FIG. 1 is a schematic diagram of a stepped heat storage molten salt energy storage system of a thermal power plant of example 1;
FIG. 2 is a schematic diagram of a molten salt exothermic system in example 1.
Wherein: the system comprises a power generation system 100, a fused salt energy storage system 200, a fused salt heat release system 300, a boiler 1, a main steam outlet 1-1, a low-temperature reheating steam inlet 1-2, a high-temperature reheating steam outlet 1-3, a boiler water feed port 1-4, a steam turbine 2, a high-pressure cylinder 2-1, a low-pressure cylinder 2-2, a generator 3, a condenser 4, a condensate pump 5, a low-pressure heater 6, a deaerator 7, a high-pressure heat release water feed pump 8, a high-pressure heater group 9, a first high-pressure heater 9-1, a second high-pressure heater 9-2, a third high-pressure heater 9-3, a first steam extraction branch 11, a second steam extraction branch 12, a third steam extraction branch 13, a fourth steam extraction branch 14, a fifth steam extraction branch 15, a first fused salt heater 16, a second fused salt heater 17, a third fused salt heater 18, a cold fused salt tank 19, a cold fused salt pump 20, a fused salt 21, a hot fused salt pump 22, a heat release water pump 23, a preheater 24, an evaporator 25, a superheater 26, a main reheat drum 27, a main steam extraction branch 28, a high-pressure heater 29, a high-pressure water pump 31 and a temperature regulating valve.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Example 1
As shown in fig. 1-2, the molten salt energy storage system for stepped heat storage of a thermal power plant described in this embodiment includes: the power generation system 100, wherein the power generation system 100 comprises a boiler 1, a steam turbine 2, a generator 3, a condenser 4, a condensate pump 5, a low-pressure heater 6, a deaerator 7, a high-pressure heat release water supply pump 8 and a high-pressure heater group 9; the steam turbine 2 comprises a high-medium pressure cylinder 2-1 and a low-pressure cylinder 2-2, and the high-medium pressure cylinder 2-1 and the low-pressure cylinder 2-2 are mechanically connected with the generator 3 through a connecting rod; the main steam outlet 1-1 of the boiler 1 is connected to the inlet of the high and medium pressure cylinder 2-1, and the outlet of the high and medium pressure cylinder 2-1 is connected to the low temperature reheat steam inlet 1-2 of the boiler 1; reheat steam heated by the boiler 1 is connected to an inlet of a low-pressure cylinder 2-2 from a high-temperature reheat steam outlet 1-3 of the boiler 1, and an outlet of the low-pressure cylinder 2-2 is connected to a condenser 4; each stage of the high-medium pressure cylinder 2-1 is sequentially connected with a first steam extraction branch pipe 11, a second steam extraction branch pipe 12 and a third steam extraction branch pipe 13, and the high-pressure heater group 9 comprises a first high-pressure heater 9-1 connected to the first steam extraction branch pipe 11, a second high-pressure heater 9-2 connected to the second steam extraction branch pipe 12 and a third high-pressure heater 9-3 connected to the third steam extraction branch pipe 13; each stage of the low-pressure cylinder 2-2 is sequentially provided with a fourth steam extraction branch pipe 14 connected to the deaerator 7 and a fifth steam extraction branch pipe 15 connected to the low-pressure heat exchanger; the condensed water of the condenser 4 is sequentially connected to the low-pressure heater 6 and the deaerator 7 through the condensed water pump 5, condensed water subjected to heat exchange and temperature rise through the low-pressure heater 6 and the deaerator 7 is sequentially connected to the first high-pressure heater 9-1, the second high-pressure heater 9-2 and the third high-pressure heater 9-3 through the high-pressure heat release water feed pump 8, and is connected to the water feed port 1-4 of the boiler 1 after subjected to heat exchange and temperature rise through the first high-pressure heater 9-1, the second high-pressure heater 9-2 and the third high-pressure heater 9-3; the low-pressure condensate formed by heat exchange of the first high-pressure heater 9-1, the second high-pressure heater 9-2 and the third high-pressure heater 9-3 is connected to a water supply mouth of the deaerator 7 through a pipeline;
the molten salt energy storage system 200 exchanges heat with the steam of the first steam extraction branch pipe 11, the second steam extraction branch pipe 12 and the third steam extraction branch pipe 13 in sequence through molten salt when storing heat, so that heat storage is realized;
the molten salt heat release system 300 is connected between the water outlet of the deaerator 7 and the low-temperature reheat steam inlet 1-2 of the boiler 1, and when releasing heat, the molten salt heat release system 300 converts the water discharged from the deaerator 7 into hot steam by using the heat stored by the molten salt energy storage system 200 and transmits the hot steam to the low-temperature reheat steam inlet 1-2 of the boiler 1, so that heat release is realized.
In the present embodiment, as shown in fig. 1, the molten salt energy storage system 200 includes a first molten salt heater 16, a second molten salt heater 17, a third molten salt heater 18, a cold salt tank 19, a cold salt pump 20, a hot salt tank 21, and a hot salt pump 22; the first steam extraction branch pipe 11 is connected with a steam inlet of the first molten salt heater 16 in a branch way, the second steam extraction branch pipe 12 is connected with a steam inlet of the second molten salt heater 17 in a branch way, and the third steam extraction branch pipe 13 is connected with a steam inlet of the third molten salt heater 18 in a branch way; the cold molten salt in the cold salt tank 19 is sequentially connected to the first molten salt heater 16, the second molten salt heater 17 and the third molten salt heater 18 through the cold salt pump 20 to heat, and the hot molten salt sequentially heated by the first molten salt heater 16, the second molten salt heater 17 and the third molten salt heater 18 is connected to a molten salt inlet of the hot salt tank 21 to realize heat storage; the hot molten salt in the cold salt tank 19 is conveyed to the molten salt heat release system 300 through the hot salt pump 22, and is connected to a molten salt inlet of the cold salt tank 19 after heat exchange and cooling of the molten salt heat release system 300, so that heat release is realized.
In the present embodiment, as shown in fig. 1 and 2, the molten salt heat release system 300 includes a heat release feed pump 23, a preheater 24, an evaporator 25, a superheater 26, and a drum 27; the hot molten salt in the hot salt tank 21 is sequentially connected to molten salt inlets of a superheater 26, an evaporator 25 and a preheater 24 through a hot salt pump 22, and is connected to a molten salt inlet of a cold salt tank 19 after heat exchange and cooling of the superheater 26, the evaporator 25 and the preheater 24; the water outlet of the deaerator 7 is divided into a branch which is connected to a heat release water supply pump 23, is pressurized by the heat release water supply pump 23 and then is connected to the water inlet of a preheater 24, and the water supply preheated by the preheater 24 is connected to a steam drum 27; boiler 1 water enters an evaporator 25 through a down pipe, and is heated by hot molten salt in the evaporator 25 to form saturated steam which enters a steam drum 27 through a rising pipe; the air outlet end of the steam drum 27 is connected to the superheater 26, and superheated steam is heated by hot molten salt in the superheater 26 and is conveyed to the low-temperature reheat steam inlet 1-2 of the boiler 1, so that heat release is realized.
Working principle: when the power generation system 100 normally works to generate power, as shown in fig. 1, main steam of a boiler 1 enters a high-medium pressure cylinder 2-1 of a steam turbine 2, heat energy is converted into mechanical energy by pushing blades in the high-medium pressure cylinder 2-1, low-temperature reheat steam is formed after a final blade of the high-medium pressure cylinder 2-1 does work and enters a low-temperature reheat steam inlet 1-2 of the boiler 1, heat exchange is carried out between the low-temperature reheat steam and boiler flue gas in the boiler 1 to form high-temperature reheat steam which enters the low-pressure cylinder 2-2 from a high-temperature reheat steam outlet 1-3, the high-temperature reheat steam pushes the blades in the low-pressure cylinder 2-2 to form mechanical energy, the mechanical energy of the high-medium pressure cylinder 1 and the low-pressure cylinder 2 is connected with a generator 3 through a coupler to generate electric energy, an outlet of the low-pressure cylinder 2-2 is connected with a condenser 4 to be condensed, is sequentially connected to the low pressure heater 6 and the deaerator 7 through the condensate pump 5, and at the same time, at each stage of the low pressure cylinder 2-2, is sequentially heated in the low pressure heater 6 and the deaerator 7 through the fourth steam extraction branch pipe 14 and the fifth steam extraction branch pipe 15, and then several paths of steam (the first steam extraction branch pipe 11, the second steam extraction branch pipe 12 and the third steam extraction branch pipe 13) are sequentially extracted in the high pressure cylinder 2-1 and sequentially enter each stage of high pressure heater (the first high pressure heater 9-1, the second high pressure heater 9-2 and the third high pressure heater 9-3), the condensate primarily heated by the low pressure heater 6 and the deaerator 7 is sequentially connected to the first high pressure heater 9-1, the second high pressure heater 9-2 and the third high pressure heater 9-3 through the high pressure heat release water feed pump 8 and sequentially heats the condensate again, finally, the low-pressure condensate formed by heat exchange of the first high-pressure heater 9-1, the second high-pressure heater 9-2 and the third high-pressure heater 9-3 enters the boiler water feeding mouth 1-4 after reaching the design temperature, is connected to the deaerator 7 through a pipeline to exchange media and recover heat, and stable operation of the thermal power generation system 100 is realized.
As shown in fig. 1, during the peak clipping phase of the power grid, the molten salt energy storage system 200 operates: the boiler 1 is lowered to the vicinity of the stable combustion load, all stages of extraction steam of the high and medium pressure cylinders 2-1 enter corresponding first molten salt heater 16, second molten salt heater 17 and third molten salt heater 18 through the first extraction branch pipe 11, the second extraction branch pipe 12 and the third extraction branch pipe 13, cold molten salt in the cold salt tank 19 is pressurized through the cold salt pump 20 and sequentially conveyed to the first molten salt heater 16, the second molten salt heater 17 and the third molten salt heater 18, so that the cold molten salt is gradually heated by the first molten salt heater 16, the second molten salt heater 17 and the third molten salt heater 18 in sequence, in the embodiment, condensate of the third molten salt heater 18 enters the second molten salt heater 17, the condensate of the third molten salt heater 18 continues to heat the molten salt in the second molten salt heater 17 with the heating steam of the second molten salt heater 17, the condensate of the second molten salt heater 17 after heat exchange enters the first molten salt heater 16 and heats the molten salt together with the primary heating steam, and finally the condensate of the first molten salt heater 16 after condensation enters the deaerator 7 for medium and heat recovery, so that the extraction steam (11, 12, 13) of the steam turbine 2 is subjected to cascade utilization in the various stages of the molten salt heaters (16, 17, 18), the multiple power generation of the extraction steam of each stage of the steam turbine is realized during energy storage, and the molten salt is also subjected to cascade heating, so that the molten salt absorbs the steam heat of different grades, the high-grade consumption of main steam and high-temperature reheat steam is reduced, the overall power generation efficiency is improved, and the unit coal consumption is reduced.
As shown in fig. 1 and 2, the molten salt heat release system 300 operates when the grid is in the valley fill phase: the low-pressure feed water at the outlet of the deaerator 7 is divided into one path, the low-pressure feed water is pressurized by an exothermic feed water pump 23 and flows into a feed water preheater 24, the preheated feed water enters a steam drum 27, meanwhile, furnace water enters an evaporator 25 through a down pipe, molten salt is heated in the evaporator 25 to form saturated steam which enters the steam drum 27 through a rising pipe, finally, the saturated steam enters a superheater 26 through an interface on the steam drum 27, the superheated steam is heated by high-temperature molten salt in the superheater 26 and is converged into a low-temperature reheat steam inlet 1-2 of a boiler 1, the high-temperature reheat steam outlet 1-3 is connected to an inlet of a low-pressure cylinder 2-2 after being heated by the boiler 1 and finally, the preheated feed water is converted into mechanical energy in the low-pressure cylinder 2-3 of a steam turbine, the high-temperature molten salt heat exchange provides partial load for the steam turbine generator set, the power generation load of the unit is increased, and the grain filling capacity of the power generation system 100 is increased; the hot molten salt is pumped out of the hot salt tank 21 by the hot molten salt pump 22 and then boosted, sequentially passes through the superheater 26, the evaporator 25 and the preheater 24, sequentially heats saturated steam, furnace water and saturated steam in the superheater 26, the evaporator 25 and the preheater 24, and returns cooled cold molten salt to the cold molten salt tank 21, so that the heat storage of the molten salt energy storage system 200 is released.
Example 2
In order to further improve the heat energy utilization efficiency, the stepped heat storage molten salt energy storage system of the thermal power plant described in this embodiment further includes a main steam molten salt heater 28, a reheat molten salt heater 29 and a high pressure condensate pressurizing pump 30 as shown in fig. 1, wherein the main steam outlet 1-1 of the boiler 1 branches into a steam inlet connected to the main steam molten salt heater 28, and the low temperature reheat steam inlet 1-2 of the boiler 1 branches into a steam inlet connected to the reheat molten salt heater 29; the molten salt subjected to heat exchange by the third molten salt heater 18 is divided into two paths which are respectively connected to the molten salt inlets of the main steam molten salt heater 28 and the reheating molten salt heater 29, and is subjected to heat exchange by the main steam molten salt heater 28 and the reheating molten salt heater 29 and then connected to the molten salt inlet of the hot salt tank 21; the high-pressure condensate formed by heat exchange of the main steam molten salt heater 28 is connected to the water feeding mouth of any one of the first high-pressure heater 9-1, the second high-pressure heater 9-2 and the third high-pressure heater 9-3 through a high-pressure condensate pressurizing pump 30; the medium-pressure condensate formed by heat exchange of the reheating molten salt heater 29 is connected to the water feeding mouth of the deaerator 7 through a pipeline. In this way, by introducing the main steam molten salt heater 29 and the reheat molten salt heater 30, the molten salt heated by the molten salt heaters (16, 17, 18) at each stage can be further heated by using the main steam and the low-temperature reheat steam of the boiler 1, thereby comprehensively utilizing the heat energy in the boiler 1 and further improving the utilization efficiency of the heat energy; the high-pressure condensate formed by heat exchange of the main steam molten salt heater 28 is connected to the water feeding mouth of any one of the first high-pressure heater 9-1, the second high-pressure heater 9-2 and the third high-pressure heater 9-3 through the high-pressure condensate pressurizing pump 30, so that the distribution and utilization of heat energy are optimized, the efficiency loss caused by uneven heat load is reduced, and the stability and the efficiency of the whole system are improved; the intermediate condensate after heat exchange of the reheating molten salt heater 30 is connected to the water supply mouth of the deaerator 7 through a pipeline, so that heat in the intermediate condensate can be recovered in the deaerator 7, the efficiency of the deaerator 7 is improved, and preheating water is provided for subsequent circulation.
In some embodiments, as shown in fig. 1, a molten salt temperature adjusting valve 31 for adjusting the molten salt temperature after heat exchange of the reheating molten salt heater 29 to be consistent with the molten salt temperature after heat exchange of the main steam molten salt heater 28 is arranged at the molten salt outlet of the reheating molten salt heater 29. Through the molten salt temperature regulating valve 31, the molten salt heated by the reheating molten salt heater 29 and the molten salt heated by the main steam molten salt heater 28 can be ensured to have the same temperature, so that the temperature consistency in the thermodynamic system can be maintained, and adverse effects on the system operation and the equipment performance caused by temperature unevenness are prevented.
According to the stepped heat storage molten salt energy storage system of the thermal power plant, provided by the embodiment, the molten salt is heated in a grading manner by a step-by-step steam extraction method of the high-medium pressure cylinder of the steam turbine, and the drainage water after the upper-level heat exchange is continuously heated in the lower-level heater, so that the loss of energy and heat is effectively reduced, and the utilization efficiency of a thermal power generating unit in the energy storage process is improved.
In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (5)
1. The utility model provides a thermal power factory ladder heat accumulation's fused salt energy storage system which characterized in that includes:
the power generation system (100), the power generation system (100) comprises a boiler (1), a steam turbine (2), a generator (3), a condenser (4), a condensate pump (5), a low-pressure heater (6), a deaerator (7), a high-pressure heat release water supply pump (8) and a high-pressure heater group (9); the steam turbine (2) comprises a high-medium pressure cylinder (2-1) and a low-pressure cylinder (2-2), and the high-medium pressure cylinder (2-1) and the low-pressure cylinder (2-2) are mechanically connected with the generator (3) through a connecting rod; the main steam outlet (1-1) of the boiler (1) is connected to the inlet of a high-medium pressure cylinder (2-1), and the outlet of the high-medium pressure cylinder (2-1) is connected to the low-temperature reheat steam inlet (1-2) of the boiler (1); reheat steam heated by the boiler (1) is connected to an inlet of a low-pressure cylinder (2-2) from a high-temperature reheat steam outlet (1-3) of the boiler (1), and an outlet of the low-pressure cylinder (2-2) is connected to a condenser (4); each stage of the high-medium pressure cylinder (2-1) is sequentially connected with a first steam extraction branch pipe (11), a second steam extraction branch pipe (12) and a third steam extraction branch pipe (13), and the high-pressure heater group (9) comprises a first high-pressure heater (9-1) connected to the first steam extraction branch pipe (11), a second high-pressure heater (9-2) connected to the second steam extraction branch pipe (12) and a third high-pressure heater (9-3) connected to the third steam extraction branch pipe (13); each stage of the low-pressure cylinder (2-2) is sequentially provided with a fourth steam extraction branch pipe (14) connected to the deaerator (7) and a fifth steam extraction branch pipe (15) connected to the low-pressure heat exchanger; the condensate water of the condenser (4) is sequentially connected to the low-pressure heater (6) and the deaerator (7) through the condensate water pump (5), condensed water subjected to heat exchange and temperature rise sequentially through the low-pressure heater (6) and the deaerator (7) is sequentially connected to the first high-pressure heater (9-1), the second high-pressure heater (9-2) and the third high-pressure heater (9-3) through the high-pressure heat release water feed pump (8), and is connected to the boiler water feed port (1-4) after heat exchange and temperature rise through the first high-pressure heater (9-1), the second high-pressure heater (9-2) and the third high-pressure heater (9-3); the low-pressure condensate formed by heat exchange of the first high-pressure heater (9-1), the second high-pressure heater (9-2) and the third high-pressure heater (9-3) is connected to a water feeding mouth of the deaerator (7) through a pipeline; the molten salt energy storage system (200) is used for sequentially exchanging heat with steam of the first steam extraction branch pipe (11), the second steam extraction branch pipe (12) and the third steam extraction branch pipe (13) through molten salt when storing heat, so that heat storage is realized;
the molten salt heat release system (300), the molten salt heat release system (300) is connected between a water outlet of the deaerator (7) and a low-temperature reheating steam inlet (1-2) of the boiler (1), and when heat is released, the molten salt heat release system (300) converts the effluent of the deaerator (7) into hot steam by utilizing the heat stored by the molten salt energy storage system (200) and conveys the hot steam to the low-temperature reheating steam inlet (1-2) of the boiler (1), so that heat release is realized.
2. The stepped heat storage molten salt energy storage system of claim 1, wherein the molten salt energy storage system (200) comprises a first molten salt heater (16), a second molten salt heater (17), a third molten salt heater (18), a cold salt tank (19), a cold salt pump (20), a hot salt tank (21) and a hot salt pump (22); the first steam extraction branch pipe (11) is connected with a steam inlet of the first molten salt heater (16), the second steam extraction branch pipe (12) is connected with a steam inlet of the second molten salt heater (17), and the third steam extraction branch pipe (13) is connected with a steam inlet of the third molten salt heater (18); the cold molten salt in the cold salt tank (19) is sequentially connected to the first molten salt heater (16), the second molten salt heater (17) and the third molten salt heater (18) through the cold salt pump (20) for heating, and the hot molten salt which is sequentially heated by the first molten salt heater (16), the second molten salt heater (17) and the third molten salt heater (18) is connected to a molten salt inlet of the hot salt tank (21) for realizing heat storage; the hot molten salt in the cold salt tank (19) is conveyed to a molten salt heat release system (300) through a hot salt pump (22), and is connected to a molten salt inlet of the cold salt tank (19) after heat exchange and cooling of the molten salt heat release system (300) to realize heat release.
3. The stepped heat storage molten salt energy storage system of claim 2, wherein the molten salt heat release system (300) comprises a heat release feed water pump (23), a preheater (24), an evaporator (25), a superheater (26) and a steam drum (27); the hot molten salt in the hot salt tank (21) is sequentially connected to molten salt inlets of the superheater (26), the evaporator (25) and the preheater (24) through the hot salt pump (22), and is connected to a molten salt inlet of the cold salt tank (19) after heat exchange and cooling of the heater (26), the evaporator (25) and the preheater (24); the water outlet of the deaerator (7) is divided into a branch which is connected to a heat release water supply pump (23), the branch is pressurized by the heat release water supply pump (23) and then connected to the water inlet of a preheater (24), and the water supply preheated by the preheater (24) is connected to a steam drum (27); boiler water of the boiler (1) enters an evaporator (25) through a down pipe, saturated steam is formed by heating hot molten salt in the evaporator (25) and enters a steam drum (27) through a rising pipe; the air outlet end of the steam drum (27) is connected to the superheater (26), and superheated steam is heated into hot molten salt by the superheater (26) and is conveyed to the low-temperature reheating steam inlet (1-2) of the boiler (1) to realize heat release.
4. The stepped heat storage molten salt energy storage system of a thermal power plant according to claim 2, further comprising a main steam molten salt heater (28), a reheating molten salt heater (29) and a high-pressure condensate pressurizing pump (30), wherein a main steam outlet (1-1) of the boiler (1) is branched off and connected to a steam inlet of the main steam molten salt heater (28), and a low-temperature reheating steam inlet (1-2) of the boiler (1) is branched off and connected to a steam inlet of the reheating molten salt heater (29); the molten salt subjected to heat exchange by the third molten salt heater (18) is divided into two paths which are respectively connected to the molten salt inlets of the main steam molten salt heater (28) and the reheating molten salt heater (29), and the molten salt subjected to heat exchange by the main steam molten salt heater (28) and the reheating molten salt heater (29) is mixed and connected to the molten salt inlet of the hot salt tank (21); the high-pressure condensate formed by heat exchange of the main steam molten salt heater (28) is connected to the water feeding mouth of any one of the first high-pressure heater (9-1), the second high-pressure heater (9-2) and the third high-pressure heater (9-3) through a high-pressure condensate pressurizing pump (30); the medium-pressure condensate formed by heat exchange of the reheating molten salt heater (29) is connected to a water feeding mouth of the deaerator (7) through a pipeline.
5. The stepped heat storage molten salt energy storage system of a thermal power plant according to claim 4, wherein a molten salt outlet of the reheating molten salt heater (29) is provided with a molten salt temperature regulating valve (31) for regulating the temperature of molten salt after heat exchange of the reheating molten salt heater (29) and the temperature of molten salt after heat exchange of the main steam molten salt heater (28) to be consistent.
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