CN114909193A - Thermal power generating unit flexible operation system based on molten salt heat storage - Google Patents
Thermal power generating unit flexible operation system based on molten salt heat storage Download PDFInfo
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- CN114909193A CN114909193A CN202210703817.XA CN202210703817A CN114909193A CN 114909193 A CN114909193 A CN 114909193A CN 202210703817 A CN202210703817 A CN 202210703817A CN 114909193 A CN114909193 A CN 114909193A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 85
- 238000005338 heat storage Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 160
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 103
- 238000010521 absorption reaction Methods 0.000 claims abstract description 66
- 239000000779 smoke Substances 0.000 claims description 24
- 238000004064 recycling Methods 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 7
- 238000010248 power generation Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Other Air-Conditioning Systems (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The utility model provides a thermal power generating unit flexible operation system based on fused salt heat-retaining includes: the system comprises a boiler device, a low-temperature tank, a high-temperature tank, a first heat exchanger and a second heat exchanger; the liquid inlet end of the heat absorption passage of the first heat exchanger is connected with the liquid outlet end of the low-temperature tank, the liquid outlet end of the heat absorption passage of the first heat exchanger is connected with the liquid inlet end of the high-temperature tank, the vapor inlet end of the heat release passage of the first heat exchanger is connected with the vapor outlet end of a vapor-water separator of the boiler device, and the liquid outlet end of the heat release passage of the first heat exchanger is connected with the liquid inlet end of a water-cooled wall of the boiler device. In the thermal power generating unit flexible operation system based on molten salt heat storage disclosed by the invention, the flexible operation of the thermal power generating unit is realized, and the peak regulation capacity of the thermal power generating unit is effectively improved.
Description
Technical Field
The disclosure relates to the technical field of thermal power generating units, in particular to a thermal power generating unit flexible operation system based on molten salt heat storage.
Background
In recent years, the scale and specific gravity of renewable energy power generation such as wind power and photovoltaic are greatly improved. However, the renewable energy has the characteristics of volatility, intermittence and the like, and after the renewable energy is connected to a power grid, the conventional thermal power generating unit is required to increase the capacity of auxiliary services such as peak regulation and peak peaking. Under the dual background that a coal-fired power generating set occupies the main power supply position and simultaneously large-scale unstable renewable energy sources need to be connected to the grid urgently, the load regulation capacity of the thermal power generating set in China needs to be improved urgently.
At present, the mode of realizing deep peak regulation of a thermal power generating unit by reducing the minimum output of a boiler device is mostly limited by the minimum stable combustion load of the boiler device, when the stable combustion load of the boiler device is too low, devices such as a combustor, a coal mill, a fan and the like cannot stably operate under the too low load, so that the thermal power generating unit cannot operate for a long time under the too low load; simultaneously, the mode that realizes thermal power unit degree of depth peak regulation through reducing boiler plant minimum output still is subject to denitrification facility's minimum entry flue gas temperature, and when boiler plant's steady burning load was crossed lowly, boiler plant's play cigarette end temperature was also lower, leads to the catalyst activity in the denitrification facility to reduce, causes denitrification facility's denitration efficiency to drop sharply, can't satisfy thermal power unit's requirement of discharging fume. Therefore, the thermal power generating unit flexible operation system based on the molten salt heat storage is provided to improve the peak regulation capacity of the thermal power generating unit.
Disclosure of Invention
The present disclosure is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the purpose of the present disclosure is to provide a thermal power generating unit flexible operation system based on molten salt heat storage.
In order to achieve the above object, the present disclosure provides a thermal power generating unit flexible operation system based on molten salt heat storage, including: the system comprises a boiler device, a low-temperature tank, a high-temperature tank, a first heat exchanger and a second heat exchanger; the liquid inlet end of the heat absorption passage of the first heat exchanger is connected with the liquid outlet end of the low-temperature tank, the liquid outlet end of the heat absorption passage of the first heat exchanger is connected with the liquid inlet end of the high-temperature tank, the vapor inlet end of the heat release passage of the first heat exchanger is connected with the vapor outlet end of a vapor-water separator of the boiler device, and the liquid outlet end of the heat release passage of the first heat exchanger is connected with the liquid inlet end of a water-cooled wall of the boiler device; the liquid inlet end of the heat release passage of the second heat exchanger is connected with the liquid outlet end of the high-temperature tank, the liquid outlet end of the heat release passage of the second heat exchanger is connected with the liquid inlet end of the low-temperature tank, the liquid inlet end of the heat absorption passage of the second heat exchanger is connected with the liquid outlet end of a feed pump of the boiler device, and the liquid outlet end of the heat absorption passage of the second heat exchanger is connected with the liquid inlet end of an economizer of the boiler device.
Optionally, the boiler device comprises: a furnace body; the water-cooled wall is arranged on the inner wall of the furnace body; the liquid outlet end of the steam-water separator is connected with the liquid inlet end of the water-cooled wall, and the liquid inlet end of the steam-water separator is connected with the liquid outlet end of the water-cooled wall; the coal economizer is arranged in the smoke outlet end of the furnace body, and the liquid outlet end of the coal economizer is connected with the liquid inlet end of the water-cooled wall; the liquid outlet end of the high-pressure heater is connected with the liquid inlet end of the economizer, and the steam inlet end of the high-pressure heater is respectively connected with the steam outlet end of a high-pressure cylinder of a steam turbine and the steam outlet end of a medium-pressure cylinder of the steam turbine; the liquid outlet end of the water feeding pump is connected with the liquid inlet end of the high-pressure heater; the superheater group is arranged in the furnace body, the steam inlet end of the superheater group is connected with the steam outlet end of the steam-water separator, and the steam outlet end of the superheater group is connected with the steam inlet end of the high-pressure cylinder.
Optionally, the flexible operation system of the thermal power generating unit further includes: the recycling pump is arranged between the liquid outlet end of the heat absorption passage of the first heat exchanger and the liquid inlet end of the water-cooled wall, the liquid inlet end of the recycling pump is connected with the liquid outlet end of the heat absorption passage of the first heat exchanger, and the liquid outlet end of the recycling pump is connected with the liquid inlet end of the water-cooled wall.
Optionally, the superheater bank includes: the steam inlet end of the horizontal low-temperature superheater is connected with the steam outlet end of the steam-water separator; the steam inlet end of the vertical low-temperature superheater is connected with the steam outlet end of the horizontal low-temperature superheater; the steam inlet end of the separating screen superheater is connected with the steam outlet end of the vertical low-temperature superheater; the steam inlet end of the high-temperature superheater is connected with the steam outlet end of the separating screen superheater; the steam inlet end of the final superheater is connected with the steam outlet end of the high-temperature superheater, and the steam outlet end of the final superheater is connected with the steam inlet end of a high-pressure cylinder of the steam turbine; the separating screen superheater, the high-temperature superheater, the final superheater, the vertical low-temperature superheater, the horizontal low-temperature superheater and the economizer are sequentially distributed along the direction from the hearth of the furnace body to the smoke outlet end of the furnace body.
Optionally, the system for flexibly operating a thermal power generating unit further includes: the first valve body is arranged on a pipeline between the steam outlet end of the steam-water separator and the steam inlet end of the heat release passage of the first heat exchanger; the second valve body is arranged on a pipeline between the steam outlet end of the steam-water separator and the steam inlet end of the horizontal low-temperature superheater; the third valve body is arranged on a pipeline between the liquid outlet end of the feed pump and the liquid inlet end of the high-pressure heater; and the fourth valve body is arranged on a pipeline between the liquid outlet end of the feed pump and the liquid inlet end of the heat absorption passage of the second heat exchanger.
Optionally, the boiler device further comprises: the high-temperature reheater is arranged in the furnace body, the high-temperature reheater is positioned between the final superheater and the vertical low-temperature superheater, and a steam inlet end of the high-temperature reheater is connected with a steam outlet end of the high-pressure cylinder; the secondary reheater is arranged in the furnace body, the secondary reheater is located between the secondary superheater and the high-temperature reheater, the steam inlet end of the secondary reheater is connected with the steam outlet end of the high-temperature reheater, and the steam outlet end of the secondary reheater is connected with the steam inlet end of the intermediate pressure cylinder.
Optionally, the flexible operation system of the thermal power generating unit further includes: a third heat exchanger; the heat absorption passage of the third heat exchanger is arranged between the liquid outlet end of the heat absorption passage of the first heat exchanger and the liquid inlet end of the high-temperature tank, the liquid inlet end of the heat absorption passage of the third heat exchanger is connected with the liquid outlet end of the heat absorption passage of the first heat exchanger, and the liquid outlet end of the heat absorption passage of the third heat exchanger is connected with the liquid inlet end of the high-temperature tank; the heat release path of the third heat exchanger is arranged between the steam inlet end of the final-stage reheater and the steam outlet end of the high-temperature reheater, the steam inlet end of the heat release path of the third heat exchanger is connected with the steam outlet end of the high-temperature reheater, and the steam inlet end of the final-stage reheater is respectively connected with the steam outlet end of the heat release path of the third heat exchanger and the steam outlet end of the high-temperature reheater.
Optionally, the flexible operation system of the thermal power generating unit further includes: the fifth valve body is arranged on a pipeline between the steam inlet end of the heat release passage of the third heat exchanger and the steam outlet end of the high-temperature reheater; and the sixth valve body is arranged on a pipeline between the steam inlet end of the final-stage reheater and the steam outlet end of the high-temperature reheater.
Optionally, the flexible operation system of the thermal power generating unit further includes: the low-temperature molten salt pump is arranged between the liquid inlet end of the heat absorption passage of the first heat exchanger and the liquid outlet end of the low-temperature tank, the liquid inlet end of the low-temperature molten salt pump is connected with the liquid outlet end of the low-temperature tank, and the liquid outlet end of the low-temperature molten salt pump is connected with the liquid inlet end of the heat absorption passage of the first heat exchanger; the seventh valve body is arranged on a pipeline between the liquid inlet end of the heat absorption passage of the first heat exchanger and the liquid outlet end of the low-temperature molten salt pump; the high-temperature molten salt pump is arranged between the liquid inlet end of the heat release passage of the second heat exchanger and the liquid outlet end of the high-temperature tank, the liquid inlet end of the high-temperature molten salt pump is connected with the liquid outlet end of the high-temperature tank, and the liquid outlet end of the high-temperature molten salt pump is connected with the liquid inlet end of the heat release passage of the second heat exchanger; and the eighth valve body is arranged on a pipeline between the liquid inlet end of the heat release passage of the second heat exchanger and the liquid outlet end of the high-temperature molten salt pump.
Optionally, the flexible operation system of the thermal power generating unit further includes: and the smoke inlet end of the denitration device is connected with the smoke outlet end of the boiler device.
The technical scheme provided by the disclosure can comprise the following beneficial effects:
when the power consumption demand is smaller and the thermal power generating unit needs deep peak regulation, the minimum stable combustion load of the boiler device is ensured, meanwhile, the output of the boiler device is reduced through fused salt heat storage, so that the peak regulation depth of the thermal power generating unit is increased, the peak regulation capacity of the thermal power generating unit is improved, in addition, the water inlet temperature of the economizer is improved by utilizing the heat stored by the fused salt, the smoke outlet end temperature of the boiler device is improved, the denitration efficiency of the denitration device is further ensured, and the smoke exhaust requirement of the thermal power generating unit is met; when the power demand is large and the thermal power generating unit is in the peak, the inlet water temperature of the economizer is guaranteed by using the heat stored in the molten salt, so that the heating quantity of the outlet steam of the steam turbine on the outlet water of the water feeding pump is reduced, the working capacity of the steam turbine is improved, and the power generation peak of the thermal power generating unit is realized. Therefore, flexible operation of the thermal power generating unit is achieved, and the peak regulation capacity of the thermal power generating unit is effectively improved.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The above and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a flexible operation system of a thermal power generating unit based on molten salt heat storage according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a flexible operation system of a thermal power generating unit based on molten salt heat storage according to an embodiment of the disclosure;
fig. 3 is a schematic structural diagram of a flexible operation system of a thermal power generating unit based on molten salt heat storage according to an embodiment of the disclosure;
as shown in the figure: 1. the system comprises a boiler device, 2, a low-temperature tank, 3, a high-temperature tank, 4, a first heat exchanger, 5, a second heat exchanger, 6, a furnace body, 7, a water-cooled wall, 8, a steam-water separator, 9, an economizer, 10, a high-pressure heater, 11, a water feeding pump, 12, a recirculating pump, 13, a horizontal low-temperature superheater, 14, a vertical low-temperature superheater, 15, a separating screen superheater, 16, a high-temperature superheater, 17, a final superheater, 18, a first valve body, 19, a second valve body, 20, a third valve body, 21, a fourth valve body, 22, a high-temperature reheater, 23, a final reheater, 24, a third heat exchanger, 25, a fifth valve body, 26, a sixth valve body, 27, a low-temperature molten salt pump, 28, a seventh valve body, 29, a high-temperature molten salt pump, 30 and an eighth valve body.
Detailed Description
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present disclosure, and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
As shown in fig. 1, the embodiment of the present disclosure provides a thermal power generating unit flexible operation system based on molten salt heat storage, including a boiler device 1, a low-temperature tank 2, a high-temperature tank 3, a first heat exchanger 4, and a second heat exchanger 5, a liquid inlet end of a heat absorption path of the first heat exchanger 4 is connected to a liquid outlet end of the low-temperature tank 2, a liquid outlet end of a heat absorption path of the first heat exchanger 4 is connected to a liquid inlet end of the high-temperature tank 3, a vapor inlet end of a heat release path of the first heat exchanger 4 is connected to a vapor outlet end of a vapor-water separator 8 of the boiler device 1, a liquid outlet end of a heat release path of the first heat exchanger 4 is connected to a liquid inlet end of a water cooling wall 7 of the boiler device 1, a liquid inlet end of a heat release path of the second heat exchanger 5 is connected to a liquid outlet end of the high-temperature tank 3, a liquid outlet end of a heat release path of the second heat exchanger 5 is connected to a liquid inlet end of the low-temperature tank 2, a liquid inlet end of a heat absorption path of the second heat exchanger 5 is connected to a liquid outlet end of a water feeding pump 11 of the boiler device 1, the liquid outlet end of the heat absorption passage of the second heat exchanger 5 is connected with the liquid inlet end of an economizer 9 of the boiler device 1.
Therefore, as shown in fig. 2, when the demand for electricity is low, the boiler device 1 is at the minimum stable combustion load, the low-temperature molten salt enters the high-temperature tank 3 from the low-temperature tank 2 through the heat absorption path of the first heat exchanger 4, and part of steam in the steam-water separator 8 enters the water-cooled wall 7 through the heat release path of the first heat exchanger 4, so that heat in part of steam in the steam-water separator 8 is released into the low-temperature molten salt, the low-temperature molten salt is changed into high-temperature molten salt, and the high-temperature molten salt is stored in the high-temperature tank 3;
as shown in fig. 1, when the temperature of the smoke outlet end of the boiler device 1 is low, the low-temperature molten salt is heated by part of steam in the steam-water separator 8, and simultaneously, the high-temperature molten salt in the high-temperature tank 3 enters the low-temperature tank 2 after passing through the heat release path of the second heat exchanger 5, and part of the outlet water of the water feed pump 11 enters the economizer 9 after passing through the heat absorption path of the second heat exchanger 5, so that the heat of the high-temperature molten salt is released into part of the outlet water of the water feed pump 11, and the part of the outlet water is heated and then enters the economizer 9.
As shown in fig. 3, when the power demand is large, the steam in the steam-water separator 8 does not enter the heat release path of the first heat exchanger 4, the high-temperature molten salt in the high-temperature tank 3 enters the low-temperature tank 2 after passing through the heat release path of the second heat exchanger 5, and all the outlet water of the water feed pump 11 enters the economizer 9 after passing through the heat absorption path of the second heat exchanger 5, so that the heat of the high-temperature molten salt is released into all the outlet water of the water feed pump 11, and all the outlet water of the water feed pump 11 is heated and then enters the economizer 9.
It can be understood that when the demand for electricity is small and the thermal power generating unit needs deep peak regulation, the minimum stable combustion load of the boiler device 1 is ensured, and meanwhile, the output of the boiler device 1 is reduced through fused salt heat storage, so that the peak regulation depth of the thermal power generating unit is increased, the peak regulation capacity of the thermal power generating unit is improved, and the water inlet temperature of the economizer 9 is improved by utilizing the heat stored in the fused salt, so that the temperature of the smoke outlet end of the boiler device 1 is improved, the denitration efficiency of the denitration device is ensured, and the smoke exhaust requirement of the thermal power generating unit is met; when the power demand is large and the thermal power generating unit is in a peak, the inlet water temperature of the economizer 9 is guaranteed by using the heat stored in the molten salt, so that the heating quantity of the outlet steam of the steam turbine to the outlet water of the water feeding pump 11 is reduced, the working capacity of the steam turbine is improved, and the power generation peak of the thermal power generating unit is realized. Therefore, flexible operation of the thermal power generating unit is achieved, and the peak regulation capacity of the thermal power generating unit is effectively improved.
Part of steam in the steam-water separator 8 enters the water-cooled wall 7 after releasing heat, so that the working medium flow in the water-cooled wall 7 is improved, the steam quantity of the boiler device 1 is reduced, the output of the boiler device 1 is reduced, and the peak regulation depth of the thermal power generating unit is increased.
It should be noted that the first heat exchanger 4 and the second heat exchanger 5 both include a heat absorption path and a heat release path for heat exchange, and heat exchange may be performed directly between the heat absorption path and the heat release path or indirectly through a heat transfer medium.
As shown in FIG. 1, in some embodiments, a boiler device 1 comprises a furnace body 6, a water wall 7, a steam-water separator 8, an economizer 9, a high-pressure heater 10, a water-feeding pump 11 and a superheater bank, wherein the water wall 7 is arranged on the inner wall of the furnace body 6, the liquid outlet end of the steam-water separator 8 is connected with the liquid inlet end of the water wall 7, the liquid inlet end of the steam-water separator 8 is connected with the liquid outlet end of the water wall 7, the economizer 9 is arranged in the smoke outlet end of the furnace body 6, the liquid outlet end of the economizer 9 is connected with the liquid inlet end of the water wall 7, the liquid outlet end of the high-pressure heater 10 is connected with the liquid inlet end of the economizer 9, the steam inlet end of the high-pressure heater 10 is respectively connected with the steam outlet end of a high-pressure cylinder of a steam turbine and the steam outlet end of a medium-pressure cylinder of the steam turbine, the liquid outlet end of the water-feeding pump 11 is connected with the liquid inlet end of the high-pressure heater 10, the superheater bank is arranged in the furnace body 6, the steam inlet end of the superheater bank is connected with the steam outlet end of the steam separator 8, the steam outlet end of the superheater group is connected with the steam inlet end of the high pressure cylinder.
It can be understood that the water-cooled wall 7 absorbs the radiant heat released by the flame and the high-temperature flue gas in the furnace body 6, the water or the steam in the water-cooled wall 7 enters the steam-water separator 8 for steam-water separation, the water in the steam-water separator 8 returns to the water-cooled wall 7 for continuous use, when the power demand is small, as shown in fig. 2, the steam part in the steam-water separator 8 enters the heat release passage of the first heat exchanger 4 for heat release, so as to reduce the output of the boiler device 1; when the demand of electricity is large, as shown in fig. 3, all the steam in the steam-water separator 8 enters the superheater group to increase the output of the boiler device 1.
When the power demand is low and the temperature of the smoke outlet end of the boiler device 1 is high, as shown in fig. 2, external water or deaerated water is pressurized and conveyed by a water feed pump 11 and sequentially passes through a high-pressure heater 10 and an economizer 9 to enter a water-cooled wall 7 so as to ensure the water consumption of the boiler device 1; when the power demand is low and the temperature of the smoke outlet end of the boiler device 1 is low, as shown in fig. 1, part of external water or deaerated water is pressurized and conveyed by a water feed pump 11 and sequentially passes through a high-pressure heater 10 and an economizer 9 to enter a water cooled wall 7, and the rest of external water or deaerated water is pressurized and conveyed by the water feed pump 11 and sequentially passes through a heat absorption passage of a second heat exchanger 5 and the economizer 9 to enter the water cooled wall 7, so that the temperature of the smoke outlet end of the boiler device 1 is increased; when the power demand is high, as shown in fig. 3, external water or deaerated water is pressurized and conveyed by the water feed pump 11 and sequentially passes through the heat absorption path of the second heat exchanger 5 and the economizer 9 and then enters the water cooled wall 7, so that the output of the boiler device 1 is increased.
It should be noted that the steam turbine includes a high pressure cylinder, an intermediate pressure cylinder and a low pressure cylinder, main steam generated by the boiler device 1 sequentially passes through the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder and works, and then enters a condenser, the condenser condenses the steam which does work into condensed water, the condensed water enters a deaerator after being heated by a low pressure heater, and the effluent of the deaerator is deaerated water. Wherein, low pressure feed water heater heats the condensate water through the play vapour of intermediate pressure jar and low pressure jar, and the steam after the heating enters into the play liquid end of condenser, and high pressure feed water heater 10 heats the deaerated water through the play vapour of high pressure jar and intermediate pressure jar, and the steam after the heating enters into the inlet end of deaerator.
As shown in fig. 1, in some embodiments, the system for flexibly operating a thermal power generating unit further includes a recirculation pump 12, the recirculation pump 12 is disposed between the liquid outlet end of the heat absorption path of the first heat exchanger 4 and the liquid inlet end of the water-cooled wall 7, the liquid inlet end of the recirculation pump 12 is connected to the liquid outlet end of the heat absorption path of the first heat exchanger 4, and the liquid outlet end of the recirculation pump 12 is connected to the liquid inlet end of the water-cooled wall 7.
It can be understood that the recirculation pump 12 pumps the heat absorption path outlet water of the first heat exchanger 4 to the water wall 7 to ensure stable heat release of part of the steam in the steam-water separator 8.
As shown in fig. 1, in some embodiments, the superheater group includes a horizontal low-temperature superheater 13, a vertical low-temperature superheater 14, a separating screen superheater 15, a high-temperature superheater 16 and a finishing superheater 17, a steam inlet end of the horizontal low-temperature superheater 13 is connected with a steam outlet end of the steam-water separator 8, a steam inlet end of the vertical low-temperature superheater 14 is connected with a steam outlet end of the horizontal low-temperature superheater 13, a steam inlet end of the separating screen superheater 15 is connected with a steam outlet end of the vertical low-temperature superheater 14, a steam inlet end of the high-temperature superheater 16 is connected with a steam outlet end of the separating screen superheater 15, a steam inlet end of the finishing superheater 17 is connected with a steam outlet end of the high-temperature superheater 16, and a steam outlet end of the finishing superheater 17 is connected with a steam inlet end of a high-pressure cylinder of the steam turbine;
the separating screen superheater 15, the high-temperature superheater 16, the final superheater 17, the vertical low-temperature superheater 14, the horizontal low-temperature superheater 13 and the economizer 9 are sequentially distributed in the direction from the hearth of the furnace body 6 to the smoke outlet end of the furnace body 6.
It can be understood that the steam in the steam-water separator 8 is heated into main steam meeting the use requirement of a high-pressure cylinder of the steam turbine after sequentially passing through the horizontal low-temperature superheater 13, the vertical low-temperature superheater 14, the separating screen superheater 15, the high-temperature superheater 16 and the final superheater 17, and the main steam enters the high-pressure cylinder of the steam turbine to do work so as to realize the power generation of the thermal power unit.
As shown in fig. 1, in some embodiments, the flexible operation system of the thermal power generating unit further includes a first valve body 18, a second valve body 19, a third valve body 20, and a fourth valve body 21, the first valve body 18 is disposed on a pipeline between a steam outlet end of the steam-water separator 8 and a steam inlet end of a heat release passage of the first heat exchanger 4, the second valve body 19 is disposed on a pipeline between a steam outlet end of the steam-water separator 8 and a steam inlet end of the horizontal low-temperature superheater 13, the third valve body 20 is disposed on a pipeline between a liquid outlet end of the feed water pump 11 and a liquid inlet end of the high-pressure heater 10, and the fourth valve body 21 is disposed on a pipeline between a liquid outlet end of the feed water pump 11 and a liquid inlet end of a heat absorption passage of the second heat exchanger 5.
It can be understood that when the electricity demand is small, as shown in fig. 2, the opening degree of the first valve body 18 and the second valve body 19 is adjusted, so that part of the steam in the steam-water separator 8 enters the heat release path of the first heat exchanger 4 to release heat, the rest steam enters a horizontal low-temperature superheater 13, a vertical low-temperature superheater 14, a separating screen superheater 15, a high-temperature superheater 16 and a final superheater 17 in sequence for heat absorption, meanwhile, when the temperature of the smoke outlet of the boiler device 1 is high, as shown in fig. 2, the third valve 20 is opened, the fourth valve 21 is closed, all the water from the feed pump 11 enters the high pressure heater 10 to absorb heat, and when the temperature of the smoke outlet of the boiler device 1 is low, as shown in fig. 1, the opening degrees of the third valve body 20 and the fourth valve body 21 are adjusted, so that part of the effluent of the water feeding pump 11 enters the high-pressure heater 10 to absorb heat, and the rest of the effluent enters the heat absorption path of the second heat exchanger 5 to absorb heat.
When the power consumption requirement is large, as shown in fig. 3, the first valve body 18 and the third valve body 20 are closed, the second valve body 19 and the fourth valve body 21 are opened, all steam in the steam-water separator 8 sequentially enters the horizontal low-temperature superheater 13, the vertical low-temperature superheater 14, the separating screen superheater 15, the high-temperature superheater 16 and the final superheater 17 to absorb heat, and all outlet water of the water feed pump 11 enters the heat absorption passage of the second heat exchanger 5 to absorb heat.
Thus, the first valve body 18, the second valve body 19, the third valve body 20 and the fourth valve body 21 are arranged, so that the distribution of the steam in the steam-water separator 8 between the heat-releasing passage of the first heat exchanger 4 and the horizontal low-temperature superheater 13 and the distribution of the outlet water of the feed water pump 11 between the high-pressure heater 10 and the heat-absorbing passage of the second heat exchanger 5 are facilitated, and the overall use is more convenient.
As shown in fig. 1, in some embodiments, the boiler apparatus 1 further includes a high-temperature reheater 22 and a final reheater 23, the high-temperature reheater 22 is disposed in the furnace body 6, the high-temperature reheater 22 is located between the final superheater 17 and the vertical low-temperature superheater 14, a steam inlet end of the high-temperature reheater 22 is connected to a steam outlet end of the high-pressure cylinder, the final reheater 23 is disposed in the furnace body 6, the final reheater 23 is located between the final superheater 17 and the high-temperature reheater 22, a steam inlet end of the final reheater 23 is connected to a steam outlet end of the high-temperature reheater 22, and a steam outlet end of the final reheater 23 is connected to a steam inlet end of the intermediate-pressure cylinder.
It can be understood that the high-pressure cylinder outlet steam of the steam turbine is heated to meet the requirement of reheat steam used by the intermediate pressure cylinder of the steam turbine after sequentially passing through the high-temperature reheater 22 and the final-stage reheater 23, and the reheat steam enters the intermediate pressure cylinder of the steam turbine to do work so as to realize power generation of the thermal power generating unit.
As shown in fig. 1, in some embodiments, the system for flexibly operating a thermal power generating unit further includes a third heat exchanger 24, the heat absorption path of the third heat exchanger 24 is disposed between the liquid outlet end of the heat absorption path of the first heat exchanger 4 and the liquid inlet end of the high temperature tank 3, the liquid inlet end of the heat absorption path of the third heat exchanger 24 is connected to the liquid outlet end of the heat absorption path of the first heat exchanger 4, the liquid outlet end of the heat absorption path of the third heat exchanger 24 is connected to the liquid inlet end of the high temperature tank 3, the heat release path of the third heat exchanger 24 is disposed between the vapor inlet end of the final reheater 23 and the vapor outlet end of the high temperature reheater 22, the vapor inlet end of the heat release path of the third heat exchanger 24 is connected to the vapor outlet end of the high temperature reheater 22, and the vapor inlet end of the final reheater 23 is connected to the vapor outlet end of the heat release path of the third heat exchanger 24 and the vapor outlet end of the high temperature reheater 22, respectively.
Therefore, when the power demand is low, as shown in fig. 2, the boiler device 1 is in the minimum stable combustion load, the low-temperature molten salt sequentially passes through the heat absorption path of the first heat exchanger 4 and the heat absorption path of the third heat exchanger 24 from the low-temperature tank 2 and then enters the high-temperature tank 3, part of steam discharged from the high-temperature reheater 22 passes through the heat release path of the third heat exchanger 24 and then enters the final-stage reheater 23, and the rest of the discharged steam directly enters the final-stage reheater 23, so that the heat of part of the discharged steam from the high-temperature reheater 22 is released into the high-temperature molten salt in the heat absorption path of the third heat exchanger 24, and the high-temperature molten salt is further heated and then stored in the high-temperature tank 3.
When the power demand is large, as shown in fig. 3, the entire steam exiting from the high-temperature reheater 22 is directed to the final reheater 23 to increase the output of the boiler plant 1.
It can be understood that when the electricity demand is small and the thermal power generating unit needs deep peak regulation, the minimum stable combustion load of the boiler device 1 is guaranteed, and meanwhile the output of the boiler device 1 is further reduced through fused salt heat storage, so that the peak regulation depth of the thermal power generating unit is increased again, and the peak regulation capacity of the thermal power generating unit is further improved.
It should be noted that the third heat exchanger 24 includes a heat absorption path and a heat release path for exchanging heat, and the heat absorption path and the heat release path may exchange heat directly or indirectly through a heat transfer medium.
As shown in fig. 1, in some embodiments, the thermal power plant flexible operation system further includes a fifth valve body 25 and a sixth valve body 26, the fifth valve body 25 is disposed on a pipeline between the connection between the steam inlet end of the heat release path of the third heat exchanger 24 and the steam outlet end of the high-temperature reheater 22, and the sixth valve body 26 is disposed on a pipeline between the connection between the steam inlet end of the final-stage reheater 23 and the steam outlet end of the high-temperature reheater 22.
It can be understood that, when the electricity demand is small, as shown in fig. 2, the opening degrees of the fifth valve body 25 and the sixth valve body 26 are adjusted, so that part of the steam discharged from the high-temperature reheater 22 enters the third heat exchanger 24 to release heat, and the rest of the steam discharged from the high-temperature reheater directly enters the final-stage reheater 23 to absorb heat.
When the power demand is large, as shown in fig. 3, the fifth valve 25 is closed, and the sixth valve 26 is opened, so that all the steam discharged from the high-temperature reheater 22 directly enters the final-stage reheater 23 to absorb heat.
Therefore, the fifth valve body 25 and the sixth valve body 26 are provided to facilitate distribution of the steam in the high-temperature reheater 22 between the heat-releasing path of the third heat exchanger 24 and the final-stage reheater 23, thereby facilitating the overall use.
As shown in fig. 1, in some embodiments, the flexible operation system of the thermal power generating unit further includes a low-temperature molten salt pump 27, a seventh valve 28, a high-temperature molten salt pump 29 and an eighth valve 30, the low-temperature molten salt pump 27 is disposed between the inlet end of the heat absorption path of the first heat exchanger 4 and the outlet end of the low-temperature tank 2, the inlet end of the low-temperature molten salt pump 27 is connected to the outlet end of the low-temperature tank 2, the outlet end of the low-temperature molten salt pump 27 is connected to the inlet end of the heat absorption path of the first heat exchanger 4, the seventh valve 28 is disposed on the pipeline between the inlet end of the heat absorption path of the first heat exchanger 4 and the outlet end of the low-temperature molten salt pump 27, the high-temperature molten salt pump 29 is disposed between the inlet end of the heat release path of the second heat exchanger 5 and the outlet end of the high-temperature tank 3, the inlet end of the high-temperature molten salt pump 29 is connected to the outlet end of the high-temperature tank 3, the liquid outlet end of the high-temperature molten salt pump 29 is connected to the heat release path of the second heat exchanger 5, the eighth valve 30 is arranged on the pipeline between the inlet end of the heat release passage of the second heat exchanger 5 and the outlet end of the high-temperature molten salt pump 29.
It can be understood that the low-temperature molten salt in the low-temperature tank 2 is pressurized and conveyed by the low-temperature molten salt pump 27 and sequentially passes through the heat absorption path of the first heat exchanger 4 and the heat absorption path of the third heat exchanger 24 to enter the high-temperature tank 3, so as to ensure stable heat absorption of the low-temperature molten salt, and the high-temperature molten salt in the high-temperature tank 3 is pressurized and conveyed by the high-temperature molten salt pump 29 and enters the low-temperature tank 2 after passing through the heat release path of the third heat exchanger 24, so as to ensure stable heat release of the high-temperature molten salt.
The seventh valve body 28 and the eighth valve body 30 are arranged, so that the on-off of the passage between the low-temperature tank 2 and the high-temperature tank 3 can be controlled conveniently, and the whole use is more convenient.
When the power demand is small, as shown in fig. 2, the low-temperature molten salt pump 27 and the seventh valve 28 are opened to make the low-temperature molten salt in the low-temperature tank 2 enter the high-temperature tank 3, wherein when the temperature of the smoke outlet end of the boiler device 1 is low, the high-temperature molten salt pump 29 and the eighth valve are opened to make the high-temperature molten salt in the high-temperature tank 3 enter the low-temperature tank 2, and when the temperature of the smoke outlet end of the boiler device 1 is high, the high-temperature molten salt pump 29 and the eighth valve are closed.
When the demand for electricity is high, as shown in fig. 3, the high-temperature molten salt pump 29 and the eighth valve are opened to allow the high-temperature molten salt in the high-temperature tank 3 to enter the low-temperature tank 2, and the low-temperature molten salt pump 27 and the seventh valve 28 are closed.
The first valve element 18, the second valve element 19, the third valve element 20, the fourth valve element 21, the fifth valve element 25, the sixth valve element 26, the seventh valve element 28, and the eighth valve element 30 may be manual on/off valves or electromagnetic on/off valves.
In some embodiments, the system for flexibly operating a thermal power generating unit further comprises a denitration device, and the smoke inlet end of the denitration device is connected with the smoke outlet end of the boiler device 1.
It can be understood that the flue gas of 1 exhaust of boiler plant discharges to the outside after the denitrification facility denitration to satisfy thermal power generating unit's requirement of discharging fume, simultaneously, through the nimble application of fused salt energy storage, guarantee that 1 cigarette end temperature of boiler plant goes out is higher than denitrification facility's minimum entry cigarette temperature all the time, thereby has guaranteed denitrification facility's high-efficient denitration.
It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present disclosure, "a plurality" means two or more unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present disclosure includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure.
Claims (10)
1. The utility model provides a flexible operating system of thermal power generating unit based on fused salt heat-retaining which characterized in that includes: the system comprises a boiler device, a low-temperature tank, a high-temperature tank, a first heat exchanger and a second heat exchanger;
the liquid inlet end of the heat absorption passage of the first heat exchanger is connected with the liquid outlet end of the low-temperature tank, the liquid outlet end of the heat absorption passage of the first heat exchanger is connected with the liquid inlet end of the high-temperature tank, the vapor inlet end of the heat release passage of the first heat exchanger is connected with the vapor outlet end of a vapor-water separator of the boiler device, and the liquid outlet end of the heat release passage of the first heat exchanger is connected with the liquid inlet end of a water-cooled wall of the boiler device;
the liquid inlet end of the heat release passage of the second heat exchanger is connected with the liquid outlet end of the high-temperature tank, the liquid outlet end of the heat release passage of the second heat exchanger is connected with the liquid inlet end of the low-temperature tank, the liquid inlet end of the heat absorption passage of the second heat exchanger is connected with the liquid outlet end of a feed pump of the boiler device, and the liquid outlet end of the heat absorption passage of the second heat exchanger is connected with the liquid inlet end of an economizer of the boiler device.
2. The thermal power generating unit flexible operation system based on molten salt heat storage according to claim 1, wherein the boiler device comprises:
a furnace body;
the water-cooled wall is arranged on the inner wall of the furnace body;
the liquid outlet end of the steam-water separator is connected with the liquid inlet end of the water-cooled wall, and the liquid inlet end of the steam-water separator is connected with the liquid outlet end of the water-cooled wall;
the coal economizer is arranged in the smoke outlet end of the furnace body, and the liquid outlet end of the coal economizer is connected with the liquid inlet end of the water-cooled wall;
the liquid outlet end of the high-pressure heater is connected with the liquid inlet end of the economizer, and the steam inlet end of the high-pressure heater is respectively connected with the steam outlet end of a high-pressure cylinder of a steam turbine and the steam outlet end of a medium-pressure cylinder of the steam turbine;
the liquid outlet end of the water feeding pump is connected with the liquid inlet end of the high-pressure heater;
the superheater group is arranged in the furnace body, the steam inlet end of the superheater group is connected with the steam outlet end of the steam-water separator, and the steam outlet end of the superheater group is connected with the steam inlet end of the high-pressure cylinder.
3. The thermal power generating unit flexible operation system based on molten salt heat storage according to claim 2, characterized by further comprising:
the recycling pump is arranged between the liquid outlet end of the heat absorption passage of the first heat exchanger and the liquid inlet end of the water-cooled wall, the liquid inlet end of the recycling pump is connected with the liquid outlet end of the heat absorption passage of the first heat exchanger, and the liquid outlet end of the recycling pump is connected with the liquid inlet end of the water-cooled wall.
4. The thermal power generating unit flexible operation system based on molten salt heat storage according to claim 2, wherein the superheater group comprises:
the steam inlet end of the horizontal low-temperature superheater is connected with the steam outlet end of the steam-water separator;
the steam inlet end of the vertical low-temperature superheater is connected with the steam outlet end of the horizontal low-temperature superheater;
the steam inlet end of the separating screen superheater is connected with the steam outlet end of the vertical low-temperature superheater;
the steam inlet end of the high-temperature superheater is connected with the steam outlet end of the separating screen superheater;
the steam inlet end of the finishing superheater is connected with the steam outlet end of the high-temperature superheater, and the steam outlet end of the finishing superheater is connected with the steam inlet end of a high-pressure cylinder of the steam turbine;
the separating screen superheater, the high-temperature superheater, the final superheater, the vertical low-temperature superheater, the horizontal low-temperature superheater and the economizer are sequentially distributed along the direction from the hearth of the furnace body to the smoke outlet end of the furnace body.
5. The thermal power generating unit flexible operation system based on molten salt heat storage according to claim 4, characterized by further comprising:
the first valve body is arranged on a pipeline between the steam outlet end of the steam-water separator and the steam inlet end of the heat release passage of the first heat exchanger;
the second valve body is arranged on a pipeline between the steam outlet end of the steam-water separator and the steam inlet end of the horizontal low-temperature superheater;
the third valve body is arranged on a pipeline between the liquid outlet end of the water feed pump and the liquid inlet end of the high-pressure heater;
and the fourth valve body is arranged on a pipeline between the liquid outlet end of the feed pump and the liquid inlet end of the heat absorption passage of the second heat exchanger.
6. The thermal power generating unit flexible operation system based on molten salt heat storage according to claim 4, wherein the boiler device further comprises:
the high-temperature reheater is arranged in the furnace body, the high-temperature reheater is positioned between the final superheater and the vertical low-temperature superheater, and a steam inlet end of the high-temperature reheater is connected with a steam outlet end of the high-pressure cylinder;
the secondary reheater is arranged in the furnace body, the secondary reheater is located between the secondary superheater and the high-temperature reheater, the steam inlet end of the secondary reheater is connected with the steam outlet end of the high-temperature reheater, and the steam outlet end of the secondary reheater is connected with the steam inlet end of the intermediate pressure cylinder.
7. The thermal power generating unit flexible operation system based on molten salt heat storage according to claim 6, further comprising: a third heat exchanger;
the heat absorption passage of the third heat exchanger is arranged between the liquid outlet end of the heat absorption passage of the first heat exchanger and the liquid inlet end of the high-temperature tank, the liquid inlet end of the heat absorption passage of the third heat exchanger is connected with the liquid outlet end of the heat absorption passage of the first heat exchanger, and the liquid outlet end of the heat absorption passage of the third heat exchanger is connected with the liquid inlet end of the high-temperature tank;
the heat release passage of the third heat exchanger is arranged between the steam inlet end of the final-stage reheater and the steam outlet end of the high-temperature reheater, the steam inlet end of the heat release passage of the third heat exchanger is connected with the steam outlet end of the high-temperature reheater, and the steam inlet end of the final-stage reheater is respectively connected with the steam outlet end of the heat release passage of the third heat exchanger and the steam outlet end of the high-temperature reheater.
8. The thermal power generating unit flexible operation system based on molten salt heat storage according to claim 7, further comprising:
the fifth valve body is arranged on a pipeline between the steam inlet end of the heat release passage of the third heat exchanger and the steam outlet end of the high-temperature reheater;
and the sixth valve body is arranged on a pipeline between the steam inlet end of the final-stage reheater and the steam outlet end of the high-temperature reheater.
9. The thermal power generating unit flexible operation system based on molten salt heat storage according to any one of claims 1-8, characterized by further comprising:
the low-temperature molten salt pump is arranged between the liquid inlet end of the heat absorption passage of the first heat exchanger and the liquid outlet end of the low-temperature tank, the liquid inlet end of the low-temperature molten salt pump is connected with the liquid outlet end of the low-temperature tank, and the liquid outlet end of the low-temperature molten salt pump is connected with the liquid inlet end of the heat absorption passage of the first heat exchanger;
the seventh valve body is arranged on a pipeline between the liquid inlet end of the heat absorption passage of the first heat exchanger and the liquid outlet end of the low-temperature molten salt pump;
the high-temperature molten salt pump is arranged between the liquid inlet end of the heat release passage of the second heat exchanger and the liquid outlet end of the high-temperature tank, the liquid inlet end of the high-temperature molten salt pump is connected with the liquid outlet end of the high-temperature tank, and the liquid outlet end of the high-temperature molten salt pump is connected with the liquid inlet end of the heat release passage of the second heat exchanger;
and the eighth valve body is arranged on a pipeline between the liquid inlet end of the heat release passage of the second heat exchanger and the liquid outlet end of the high-temperature molten salt pump.
10. The thermal power generating unit flexible operation system based on molten salt heat storage according to any one of claims 1-8, characterized by further comprising:
and the smoke inlet end of the denitration device is connected with the smoke outlet end of the boiler device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210703817.XA CN114909193B (en) | 2022-06-21 | 2022-06-21 | Thermal power generating unit flexible operation system based on fused salt heat storage |
| PCT/CN2022/140497 WO2023246030A1 (en) | 2022-06-21 | 2022-12-20 | Molten salt heat storage-based thermal power generating unit flexible operation system |
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| CN202210703817.XA CN114909193B (en) | 2022-06-21 | 2022-06-21 | Thermal power generating unit flexible operation system based on fused salt heat storage |
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| CN114909193B CN114909193B (en) | 2024-02-27 |
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|---|---|---|---|---|
| WO2023246030A1 (en) * | 2022-06-21 | 2023-12-28 | 西安热工研究院有限公司 | Molten salt heat storage-based thermal power generating unit flexible operation system |
| CN115371074A (en) * | 2022-08-29 | 2022-11-22 | 西安热工研究院有限公司 | System for utilize fused salt heat-retaining-heat transfer to promote low-load denitration entry gas temperature |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114909193B (en) | 2024-02-27 |
| WO2023246030A1 (en) | 2023-12-28 |
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