CN117128530B - Heat pipe type flue gas heating fused salt heat storage system - Google Patents
Heat pipe type flue gas heating fused salt heat storage system Download PDFInfo
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- CN117128530B CN117128530B CN202311116018.3A CN202311116018A CN117128530B CN 117128530 B CN117128530 B CN 117128530B CN 202311116018 A CN202311116018 A CN 202311116018A CN 117128530 B CN117128530 B CN 117128530B
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- flue gas
- molten salt
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- flue
- pipe type
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- 150000003839 salts Chemical class 0.000 title claims abstract description 230
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000003546 flue gas Substances 0.000 title claims abstract description 118
- 238000005338 heat storage Methods 0.000 title claims abstract description 45
- 238000010438 heat treatment Methods 0.000 title claims abstract description 36
- 238000009833 condensation Methods 0.000 claims abstract description 15
- 230000005494 condensation Effects 0.000 claims abstract description 15
- 238000001704 evaporation Methods 0.000 claims abstract description 13
- 230000008020 evaporation Effects 0.000 claims abstract description 13
- 238000012546 transfer Methods 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 description 15
- 238000004146 energy storage Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000012983 electrochemical energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
-
- 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
-
- 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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
-
- 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
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a heat pipe type flue gas heating fused salt heat storage system, which comprises a coal-fired boiler, wherein the coal-fired boiler is provided with a hearth, a horizontal flue and a vertical tail flue, the tail flue is provided with a bypass flue connected with the hearth in parallel, the bypass flue is provided with a flue gas-fused salt heat exchanger, the flue gas-fused salt heat exchanger comprises a high-temperature heat pipe type flue gas-fused salt heat exchanger and a low-temperature heat pipe type flue gas-fused salt heat exchanger, the high-temperature heat pipe type flue gas-fused salt heat exchanger is horizontally arranged at the inlet of the bypass flue, and the low-temperature heat pipe type flue gas-fused salt heat exchanger is horizontally arranged at the outlet of the bypass flue; the high-temperature low-temperature heat pipe type flue gas-molten salt heat exchanger is respectively provided with a flue gas flow passage, a molten salt flow passage and a heat pipe, wherein an evaporation section of the heat pipe is positioned in the flue gas flow passage, and a condensation section of the heat pipe is positioned in the molten salt flow passage. The system can realize high-efficiency heat storage of the thermal generator set, and is high in safety and good in economical efficiency.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a heat pipe type flue gas heating fused salt heat storage system suitable for a thermal power generation unit.
Background
In order to achieve the aim of converting an energy structure from carbon-based energy to zero-carbon energy, a large amount of new energy such as wind, photoelectricity and the like is accessed into a power grid every year for all large-power enterprises.
However, wind power and photoelectricity have randomness and volatility characteristics, and cannot be matched with power generation load and power utilization load, so that great threat is caused to the stability of a power grid. Therefore, developing a novel energy storage technology with high efficiency and large capacity has become one of means for solving unbalance of supply and demand of a power system.
The energy storage technology can be divided into a plurality of energy storage modes such as electrochemical energy storage, mechanical energy storage, thermal energy storage and the like according to the principle. The electrochemical energy storage adopts a direct electricity storage mode, so that the energy storage efficiency is high, but large-scale storage is difficult to realize. The mechanical energy storage is represented by pumped storage and compressed air energy storage, wherein the pumped storage is mature, but the environment condition of the topography height difference is needed, the compressed air energy storage energy density is low, the storage tank group and the salt cavern mine needed by the stored compressed air occupy large space, and the large-scale popularization is difficult.
The thermal power generation is the main power generation mode in China at present, when the power generation load is lower than the power utilization load, the heat for power generation is directly stored, the thermal power generation is relatively simpler and more efficient, the heat transfer and conversion process loss is avoided, and the thermal power generation system has a wide development prospect.
However, the existing heat energy storage technical scheme has the problems of low safety, poor economy and the like.
Disclosure of Invention
The invention aims to provide a heat pipe type flue gas heating molten salt heat storage system. The system utilizes the flue gas to heat the molten salt through the heat pipe type flue gas-molten salt heat exchanger to store heat, can realize the high-efficiency heat storage of the thermal generator set, and has high safety and good economical efficiency.
In order to achieve the above purpose, the invention provides a heat pipe type flue gas heating fused salt heat storage system, which comprises a coal-fired boiler, wherein the coal-fired boiler is provided with a hearth, a horizontal flue and a vertical tail flue, the tail flue is provided with a bypass flue connected with the hearth in parallel, the bypass flue is provided with a flue gas-fused salt heat exchanger, the flue gas-fused salt heat exchanger comprises a high-temperature heat pipe type flue gas-fused salt heat exchanger and a low-temperature heat pipe type flue gas-fused salt heat exchanger, the high-temperature heat pipe type flue gas-fused salt heat exchanger is horizontally arranged at the inlet of the bypass flue, and the low-temperature heat pipe type flue gas-fused salt heat exchanger is horizontally arranged at the outlet of the bypass flue; the high-temperature heat pipe type flue gas-molten salt heat exchanger and the low-temperature heat pipe type flue gas-molten salt heat exchanger are respectively provided with a flue gas flow passage, a molten salt flow passage and a heat pipe, an evaporation section of the heat pipe is positioned in the flue gas flow passage, and a condensation section of the heat pipe is positioned in the molten salt flow passage; the flue gas flow passage is connected to the bypass flue and is used for circulating flue gas and heating the evaporation section of the heat pipe, the heat pipe is arranged to transfer heat to the condensation section in a phase-change heat transfer mode, and the condensation section is used for heating molten salt in the molten salt flow passage; the molten salt runner is connected to the molten salt heat storage loop and is used for circulating molten salt to store heat.
Optionally, the system further comprises a cold molten salt storage tank and a hot molten salt storage tank, wherein an outlet of the cold molten salt storage tank is communicated with a molten salt flow passage inlet of the low-temperature heat pipe type flue gas-molten salt heat exchanger through a low-temperature salt pump, a molten salt flow passage outlet of the low-temperature heat pipe type flue gas-molten salt heat exchanger is communicated with a molten salt flow passage inlet of the high-temperature heat pipe type flue gas-molten salt heat exchanger, and a molten salt flow passage outlet of the high-temperature heat pipe type flue gas-molten salt heat exchanger is communicated with an inlet of the hot molten salt storage tank.
Optionally, a low-temperature superheater and an economizer are arranged in the tail flue, and a flue gas flow passage of the high-temperature heat pipe type flue gas-molten salt heat exchanger is communicated with the tail flue at the upstream of the low-temperature superheater; and a flue gas flow passage of the low-temperature heat pipe type flue gas-molten salt heat exchanger is communicated with the tail flue at the downstream of the economizer.
Optionally, a flue gas flow passage of the high-temperature heat pipe type flue gas-molten salt heat exchanger is communicated with the tail flue through a flue inlet expansion joint, and a flue gas flow passage of the low-temperature heat pipe type flue gas-molten salt heat exchanger is communicated with the tail flue through a flue outlet expansion joint.
Optionally, the molten salt runners of the high-temperature heat pipe type flue gas-molten salt heat exchanger and the low-temperature heat pipe type flue gas-molten salt heat exchanger are positioned at the top of the flue gas runners; one end of the flue gas flow channel is a flue gas inlet and is used for communicating with the tail flue; the other end of the flue gas flow channel is a flue gas outlet and is used for communicating with the bypass flue; the molten salt runner is provided with a molten salt runner inlet and a molten salt runner outlet.
Optionally, the molten salt runner inlet is located at a bottom position of one side of the molten salt runner, and the molten salt runner outlet is located at a top position of the other side of the molten salt runner.
Optionally, the flue gas inlet of the flue gas flow channel is connected with the tail flue through a flue gas inlet flange, and the flue gas outlet of the flue gas flow channel is connected with the bypass flue through a flue gas outlet flange.
Optionally, a partition plate is arranged between the flue gas flow channel and the molten salt flow channel, and the heat pipe penetrates through the partition plate.
Optionally, the evaporation section of the heat pipe is in the form of a fin tube or a light pipe.
Optionally, the heat pipes are distributed along a vertical direction or form a certain inclination angle with a horizontal direction.
According to the heat pipe type flue gas heating fused salt heat storage system, a fused salt heat storage loop is newly added in a coal-fired power generation system, the fused salt heat storage loop and the coal-fired power generation system are coupled and exchange heat through a heat pipe type flue gas-fused salt heat exchanger, a flue gas flow channel of the heat exchanger is connected with the coal-fired power generation system, flue gas flows and releases sensible heat to fused salt, a fused salt flow channel of the heat exchanger is connected with the fused salt heat storage loop, high-temperature fused salt flows and stores heat, an evaporation section and a condensation section of a heat pipe of the heat exchanger are respectively arranged in the flue gas flow channel and the fused salt flow channel, and the heat of the heat pipe is transferred to the condensation section in a phase-change heat transfer mode. In this way, cold molten salt from the cold molten salt storage tank flows through the molten salt runner of the heat exchanger and exchanges heat with the condensing section of the heat pipe to be heated into hot molten salt, and the hot molten salt is sent to the hot molten salt storage tank to store heat in the form of molten salt sensible heat. Because the flue gas is used as a heat source and the heat pipe is used as a heat transfer intermediate means to heat the molten salt for heat storage, the flue gas and the molten salt in the system do not directly exchange heat, the problem that the heat exchange pipe is easy to lose efficacy due to double corrosion of the flue gas and the molten salt is avoided, and the isolation and maintenance of molten salt loop equipment are facilitated; moreover, as the heat pipe has high heat transfer coefficient and large heat transfer temperature difference, the heat exchange capability of flue gas for heating molten salt is improved, and the volume of heat exchange equipment is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a heat pipe type flue gas heating molten salt heat storage system according to an embodiment of the present invention;
Fig. 2 is a schematic view of the structure of the high-temperature heat pipe type flue gas-molten salt heat exchanger shown in fig. 1.
In the figure:
1. A flue gas loop of the coal-fired boiler; 2. the flue gas heats the fused salt heat storage device; 3. a furnace; 4. a horizontal flue; 5. a tail flue; 6. a flue inlet expansion joint; 7. a high-temperature heat pipe type flue gas-molten salt heat exchanger; 8. a bypass flue; 9. a low-temperature heat pipe type flue gas-molten salt heat exchanger; 10. a flue outlet expansion joint; 11. a hot molten salt storage tank; 12. a low temperature salt pump; 13. a cold melt salt storage tank; 14. a flue inlet flange; 15. a heat pipe; 16. a flue gas flow passage; 17. a flue outlet flange; 18. a partition plate; 19. a molten salt runner inlet; 20. molten salt flow passage; 21. a molten salt runner outlet; 22. a low temperature superheater; 23. an economizer.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
In the present specification, the terms "upper, lower, inner, outer" and the like are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may be changed according to the drawings, so that the terms are not to be construed as absolute limitation of the protection scope; moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a heat pipe type flue gas heating molten salt heat storage system according to an embodiment of the invention.
As shown in the figure, in a specific embodiment, the heat pipe type flue gas heating fused salt heat storage system provided by the invention is suitable for a coal-fired boiler of a coal-fired power generation system, and the whole system mainly comprises a flue gas loop 1 of the coal-fired boiler and a flue gas heating fused salt heat storage device 2, wherein the flue gas loop 1 of the coal-fired boiler and the flue gas heating fused salt heat storage device 2 are coupled and exchange heat through a high-temperature heat pipe type flue gas-fused salt heat exchanger 7 and a low-temperature heat pipe type flue gas-fused salt heat exchanger 9.
The flue gas loop 1 of the coal-fired boiler is mainly formed by sequentially connecting a hearth 3, a horizontal flue 4 and a tail flue 5, the flue gas heating molten salt heat storage device 2 is connected with the vertical tail flue 5 in parallel, and a low-temperature superheater 22 and an economizer 23 are arranged in the tail flue 5.
The flue gas heating fused salt heat storage device 2 mainly comprises a flue inlet expansion joint 6, a high-temperature heat pipe type flue gas-fused salt heat exchanger 7, a bypass flue 8, a low-temperature heat pipe type flue gas-fused salt heat exchanger 9, a flue outlet expansion joint 10, a hot fused salt storage tank 11, a low-temperature salt pump 12, a cold fused salt storage tank 13 and the like, wherein the high-temperature heat pipe type flue gas-fused salt heat exchanger 7 and the low-temperature heat pipe type flue gas-fused salt heat exchanger 9 are horizontally arranged, and the bypass flue 8 is vertically arranged.
Specifically, the bypass flue 8 is connected in parallel with the tail flue 5, the high-temperature heat pipe type flue gas-molten salt heat exchanger 7 is horizontally arranged at the inlet of the bypass flue 8, and the low-temperature heat pipe type flue gas-molten salt heat exchanger 9 is horizontally arranged at the outlet of the bypass flue 8; the high-temperature heat pipe type flue gas-molten salt heat exchanger 7 and the low-temperature heat pipe type flue gas-molten salt heat exchanger 9 are respectively provided with a flue gas flow passage 16, a molten salt flow passage 20 and a heat pipe 15, taking the high-temperature heat pipe type flue gas-molten salt heat exchanger 7 as an example, the heat pipe 15 is an alkali metal heat pipe, an evaporation section of the heat pipe 15 is positioned in the flue gas flow passage 16, and a condensation section of the heat pipe 15 is positioned in the molten salt flow passage 20.
The flue gas flow passage 16 is connected to the bypass flue 8 and is used for circulating flue gas and heating the evaporation section of the heat pipe 15, the heat pipe 15 is arranged to transfer heat to the condensation section in a phase-change heat transfer mode, and the condensation section is used for heating molten salt in the molten salt flow passage 20; the molten salt runner 20 is connected to a molten salt heat storage loop for circulating molten salt for heat storage.
The outlet of the cold molten salt storage tank 13 is communicated with the molten salt flow passage inlet of the low-temperature heat pipe type flue gas-molten salt heat exchanger 9 through a low-temperature salt pump 12, the molten salt flow passage outlet of the low-temperature heat pipe type flue gas-molten salt heat exchanger 9 is communicated with the molten salt flow passage inlet of the high-temperature heat pipe type flue gas-molten salt heat exchanger 7, and the molten salt flow passage outlet of the high-temperature heat pipe type flue gas-molten salt heat exchanger 7 is communicated with the inlet of the hot molten salt storage tank 11.
The tail flue 5 is internally provided with a low-temperature superheater 22 and an economizer 23, a flue gas flow passage of the high-temperature heat pipe type flue gas-molten salt heat exchanger 7 is communicated with the tail flue 5 at the upstream of the low-temperature superheater 22, and a flue inlet expansion joint 6 is arranged between the low-temperature superheater and the low-temperature superheater; the flue gas flow passage of the low-temperature heat pipe type flue gas-molten salt heat exchanger 9 is communicated with the tail flue 5 at the downstream of the economizer 23, and a flue outlet expansion joint 10 is arranged between the two.
The working flow of the heat pipe type flue gas heating molten salt heat storage system is as follows:
On the flue gas flow path, flue gas in the flue gas loop 1 of the coal-fired boiler respectively enters the tail flue 5 and the flue gas heating fused salt heat storage device 2 (shown by a two-dot chain line in the figure), one part of flue gas flows through the low-temperature superheater 22 and the economizer 23 in the tail flue 5, the other part of flue gas flows through the flue gas flow channel of the high-temperature heat pipe type flue gas-fused salt heat exchanger 7, the bypass flue 8 and the flue gas flow channel of the low-temperature heat pipe type flue gas-fused salt heat exchanger 9 in sequence in the flue gas heating fused salt heat storage device 2 and releases heat, and finally returns to the tail flue 5.
On the molten salt flow path, low-temperature molten salt from the low-temperature molten salt storage tank 13 flows through the molten salt flow paths of the low-temperature heat pipe type flue gas-molten salt heat exchanger 9 and the high-temperature molten salt heat pipe heat exchanger 7 in sequence by using the low-temperature salt pump 12 and absorbs heat (shown by a single-dot chain line in the figure), and finally flows to the hot molten salt storage tank 11.
Sensible heat stored by the hot molten salt can be returned to the power generation system for power generation through steam and water of the heating boiler and the steam turbine generator unit regenerative system, and can also be used for heating steam and water to externally supply industrial steam.
Referring to fig. 2 together, fig. 2 is a schematic structural diagram of the high-temperature heat pipe type flue gas-molten salt heat exchanger shown in fig. 1.
As shown in the figure, the high-temperature heat pipe type flue gas-molten salt heat exchanger 7 and the low-temperature heat pipe type flue gas-molten salt heat exchanger 9 have basically the same structure, and the molten salt flow paths of the two are connected in series, or taking the high-temperature heat pipe type flue gas-molten salt heat exchanger 7 as an example, the molten salt flow passage 20 is positioned at the top of the flue gas flow passage 16; one end of the flue gas flow channel 16 is a flue gas inlet for communicating with the tail flue 5, and the other end of the flue gas flow channel 16 is a flue gas outlet for communicating with the bypass flue 8; the molten salt runner 20 is provided with a molten salt runner inlet 19 and a molten salt runner outlet 21.
The molten salt runner inlet 19 is located the bottom position of one side of molten salt runner 20, and the molten salt runner outlet 21 is located the top position of the opposite side of molten salt runner 20, is favorable to the molten salt to flow along the place more and exchange heat, and the flue gas inlet of flue gas runner 16 is connected with afterbody flue 5 through flue inlet flange 14, and the flue gas outlet of flue gas runner 16 is connected with bypass flue 8 through flue outlet flange 17.
A partition plate 18 is arranged between the flue gas flow channel 16 and the molten salt flow channel 20, a plurality of heat pipes 15 penetrate through the partition plate 18, an evaporation section of the heat pipes 15 is positioned in the flue gas flow channel 16, a condensation section of the heat pipes is positioned in the molten salt flow channel 20, the evaporation section of the heat pipes 15 can be in a fin pipe or light pipe form, the heat pipes 15 can be distributed along the vertical direction or form a certain inclination angle with the horizontal direction, and working media in the heat pipes can conveniently flow back to the evaporation section by utilizing gravity.
The specific working processes of the high-temperature heat pipe type flue gas-molten salt heat exchanger 7 and the low-temperature heat pipe type flue gas-molten salt heat exchanger 9 are as follows: the boiler flue gas first heats the evaporation section of the heat pipe 15 in the flue gas flow channel 16, causing the working medium in the heat pipe to evaporate and move to the upper condensation section, and then the cold molten salt exchanges heat with the condensation section of the heat pipe 15 in the molten salt flow channel 20 and is heated to hot molten salt. In the process, the flue gas is gradually cooled, the temperature of molten salt is continuously increased, sensible heat of the flue gas is transferred into sensible heat of the molten salt, and then the sensible heat of the flue gas is sent to a hot molten salt storage tank 11 for storage, so that the storage of heat of the flue gas is realized.
The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of these, specific adjustments may be made according to actual needs, thereby obtaining different embodiments. For example, the configuration of the back pass 5 and the components provided therein will vary accordingly, depending on the type of boiler, etc. This is not illustrated here, as there are many possible implementations.
Compared with the prior art, the heat pipe type flue gas heating molten salt heat storage system provided by the invention has the advantages of economy, safety and the like, and is suitable for energy storage of a coal-fired thermal generator set. Compared with steam-water heat storage, the invention uses the flue gas as a heat storage heat source, reduces the middle process of steam-water heat storage, avoids the quality degradation in the energy transmission process, can store heat energy with higher quality, and simultaneously does not need to arrange high-temperature high-pressure steam-water heat exchange equipment, thereby having small investment and high safety; compared with the direct heat exchange and heat storage of the flue gas and the fused salt, the heat pipe type flue gas-fused salt heat exchanger provided by the invention uses the heat pipe as an intermediate medium to isolate the flue gas from the fused salt, so that the threat of corrosion of both sides of the flue gas and the fused salt of the flue gas-fused salt heat exchanger is avoided, and the safety of equipment is improved. Meanwhile, the heat pipe has high heat transfer coefficient and flexible arrangement, so that the flue gas heat storage equipment is more compact.
The heat pipe type flue gas heating molten salt heat storage system provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. The heat pipe type flue gas heating fused salt heat storage system comprises a coal-fired boiler, wherein the coal-fired boiler is provided with a hearth, a horizontal flue and a vertical tail flue, the tail flue is provided with a bypass flue connected with the hearth in parallel, and the bypass flue is provided with a flue gas-fused salt heat exchanger; the high-temperature heat pipe type flue gas-molten salt heat exchanger and the low-temperature heat pipe type flue gas-molten salt heat exchanger are respectively provided with a flue gas flow passage, a molten salt flow passage and a heat pipe, an evaporation section of the heat pipe is positioned in the flue gas flow passage, and a condensation section of the heat pipe is positioned in the molten salt flow passage; the flue gas flow passage is connected to the bypass flue and is used for circulating flue gas and heating the evaporation section of the heat pipe, the heat pipe is arranged to transfer heat to the condensation section in a phase-change heat transfer mode, and the condensation section is used for heating molten salt in the molten salt flow passage; the molten salt runner is connected to the molten salt heat storage loop and is used for circulating molten salt to store heat.
2. The heat pipe flue gas heating molten salt heat storage system of claim 1, further comprising a cold molten salt storage tank and a hot molten salt storage tank, wherein an outlet of the cold molten salt storage tank is communicated with a molten salt flow channel inlet of the low-temperature heat pipe flue gas-molten salt heat exchanger through a low-temperature salt pump, a molten salt flow channel outlet of the low-temperature heat pipe flue gas-molten salt heat exchanger is communicated with a molten salt flow channel inlet of the high-temperature heat pipe flue gas-molten salt heat exchanger, and a molten salt flow channel outlet of the high-temperature heat pipe flue gas-molten salt heat exchanger is communicated with an inlet of the hot molten salt storage tank.
3. The heat pipe type flue gas heating molten salt heat storage system according to claim 1, wherein a low-temperature superheater and an economizer are arranged in the tail flue, and a flue gas flow passage of the high-temperature heat pipe type flue gas-molten salt heat exchanger is communicated with the tail flue at the upstream of the low-temperature superheater; and a flue gas flow passage of the low-temperature heat pipe type flue gas-molten salt heat exchanger is communicated with the tail flue at the downstream of the economizer.
4. A heat pipe type flue gas heating molten salt heat storage system according to claim 3, wherein a flue gas flow passage of the high temperature heat pipe type flue gas-molten salt heat exchanger is communicated with the tail flue through a flue inlet expansion joint, and a flue gas flow passage of the low temperature heat pipe type flue gas-molten salt heat exchanger is communicated with the tail flue through a flue outlet expansion joint.
5. The heat pipe type flue gas heating molten salt heat storage system according to claim 1, wherein the molten salt runners of the high-temperature heat pipe type flue gas-molten salt heat exchanger and the low-temperature heat pipe type flue gas-molten salt heat exchanger are positioned at the top of the flue gas runners; one end of a flue gas flow channel of the high-temperature heat pipe type flue gas-molten salt heat exchanger is a flue gas inlet and is used for communicating with the tail flue; the other end of the flue gas flow channel of the high-temperature heat pipe type flue gas-molten salt heat exchanger is a flue gas outlet which is used for communicating with the bypass flue; the molten salt runner is provided with a molten salt runner inlet and a molten salt runner outlet.
6. The heat pipe flue gas heated molten salt heat storage system of claim 5 wherein said molten salt runner inlet is located at a bottom position on one side of said molten salt runner and said molten salt runner outlet is located at a top position on the other side of said molten salt runner.
7. The heat pipe type flue gas heating molten salt heat storage system according to claim 5, wherein a flue gas inlet of a flue gas flow channel of the high temperature heat pipe type flue gas-molten salt heat exchanger is connected with the tail flue through a flue inlet flange, and a flue gas outlet of the flue gas flow channel of the high temperature heat pipe type flue gas-molten salt heat exchanger is connected with the bypass flue through a flue outlet flange.
8. The heat pipe type flue gas heating molten salt heat storage system according to claim 5, wherein a partition plate is arranged between the flue gas flow passage and the molten salt flow passage, and the heat pipe penetrates through the partition plate.
9. A heat pipe flue gas heated molten salt heat storage system as claimed in any one of claims 1 to 8 wherein the evaporator section of the heat pipe is in the form of a finned tube or a light pipe.
10. The heat pipe type flue gas heating molten salt heat storage system according to claim 9, wherein the heat pipes are distributed in a vertical direction or form a certain inclination angle with a horizontal direction.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112629300A (en) * | 2020-11-19 | 2021-04-09 | 东北大学 | Combined cooling, heating and power system utilizing fused salt to store heat |
| CN114151821A (en) * | 2021-12-07 | 2022-03-08 | 思安新能源股份有限公司 | Flue gas waste heat recovery application system for realizing energy gradient utilization |
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| WO2011047086A2 (en) * | 2009-10-14 | 2011-04-21 | Infinia Corporation | Systems, apparatus and methods for thermal energy storage, coupling and transfer |
| CN115096101A (en) * | 2022-05-14 | 2022-09-23 | 北京首钢国际工程技术有限公司 | Converter waste heat fused salt energy storage high-efficiency power generation system |
| CN115711381A (en) * | 2022-11-17 | 2023-02-24 | 北京思安综合能源发展有限公司 | System for stably producing steam by storing and adjusting flue gas waste heat of electric furnace and control method thereof |
| CN219572774U (en) * | 2023-03-31 | 2023-08-22 | 北京怀柔实验室 | Heat exchanger and coal-fired generating set with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629300A (en) * | 2020-11-19 | 2021-04-09 | 东北大学 | Combined cooling, heating and power system utilizing fused salt to store heat |
| CN114151821A (en) * | 2021-12-07 | 2022-03-08 | 思安新能源股份有限公司 | Flue gas waste heat recovery application system for realizing energy gradient utilization |
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