CN220793974U - Multistage heat storage system based on heat supply thermal power unit - Google Patents
Multistage heat storage system based on heat supply thermal power unit Download PDFInfo
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- CN220793974U CN220793974U CN202322269969.6U CN202322269969U CN220793974U CN 220793974 U CN220793974 U CN 220793974U CN 202322269969 U CN202322269969 U CN 202322269969U CN 220793974 U CN220793974 U CN 220793974U
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- 238000005338 heat storage Methods 0.000 title claims abstract description 187
- 150000003839 salts Chemical class 0.000 claims abstract description 111
- 239000000463 material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 6
- 239000012782 phase change material Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The utility model relates to a multi-stage heat storage system based on a heat supply thermal power unit, which comprises a medium-temperature heat storage tank and a high-temperature heat storage tank, wherein the lower parts of the medium-temperature heat storage tank and the high-temperature heat storage tank are respectively communicated with a first molten salt branch pipeline, the two first molten salt branch pipelines are communicated through the first molten salt pipeline, the other end of the first molten salt pipeline is communicated with a heat storage heat exchanger, the heat storage heat exchanger is connected to the upper part of the medium-temperature heat storage tank through a medium-temperature molten salt pipeline, the heat storage heat exchanger is connected to the upper part of the high-temperature heat storage tank through a high-temperature molten salt pipeline, the upper part of the medium-temperature heat storage tank is communicated with a heat release heat exchanger through a second molten salt pipeline, the upper part of the high-temperature heat storage tank is connected to the heat release heat exchanger through a third molten salt pipeline, and the molten salt outlet pipeline is respectively communicated to the lower parts of the medium-temperature heat storage tank and the high-temperature heat storage tank through a branch. The utility model can improve the operation efficiency of the system, obtain better energy level matching with the system, and reduce the investment and the occupied area of the heat storage system.
Description
Technical Field
The utility model relates to a multi-stage heat storage system based on a heat supply thermal power unit, and belongs to the technical field of heat storage.
Background
In recent years, with the proposal of 'carbon peak, carbon neutralization' targets, the duty ratio of renewable energy sources in China in the scale of a general assembly machine is gradually increased. However, the output of renewable energy sources such as wind, light and the like has the characteristics of randomness, fluctuation and the like, and the power grid is adversely affected. In order to improve the capacity of new energy consumption, the flexibility of traditional units such as thermal power needs to be improved.
Generally, flexibility techniques for thermal power generating units include deep peaking, fast start-up and shut-down, fast load response, thermal decoupling, and the like. For a thermal power generating unit for heat supply, the power generation load and the heat supply load are coupled together, and the deep peak shaving of the unit has a relatively large influence on heat supply parameters. This problem can be solved by configuring the heat storage device for thermal decoupling. Under normal working condition operation, storing surplus energy through the heat storage device; and in the deep peak regulation mode of the unit, the heat is released through the heat storage device to be used for supplying heat.
The existing heat storage scheme generally utilizes a high-temperature molten salt storage tank and a low-temperature molten salt storage tank to respectively store molten salts with different temperatures, supplies heat steam through heat release of the high-temperature molten salt in a heat utilization peak period, and stores heat through heating of the low-temperature molten salt in a heat utilization valley period. In order to match different temperature energy levels, the prior art is even provided with three molten salt storage tanks with high temperature, medium temperature and low temperature for heat storage. The problems brought by the method are low heat storage energy taste, large investment of a molten salt tank, large occupied area and the like. There is therefore a need for a better solution to the above problems.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a multi-stage heat storage system based on a heat supply thermal power unit, which can improve the operation efficiency of the system, obtain better energy level matching with the system, and reduce the investment and the occupied area of the heat storage system.
The technical scheme of the utility model is as follows:
the utility model provides a multistage heat accumulation system based on heat supply thermal power unit, includes medium temperature heat storage tank, high temperature heat storage tank, medium temperature heat storage tank and high temperature heat storage tank lower part all communicate there is first fused salt lateral conduit, and two first fused salt lateral conduits communicate through first fused salt pipeline, first fused salt pipeline other end intercommunication has the heat storage heat exchanger, the heat storage heat exchanger is connected to the upper portion of medium temperature heat storage tank through setting up medium temperature fused salt pipeline, be connected to the upper portion of high temperature heat storage tank through setting up the high temperature fused salt pipeline on the heat storage heat exchanger, medium temperature heat storage tank upper portion has the heat release heat exchanger through second fused salt pipeline intercommunication, high temperature heat storage tank upper portion is connected to the heat release heat exchanger through the third fused salt pipeline, the heat release heat exchanger intercommunication has the fused salt export pipeline, the fused salt export pipeline is connected to the lower part of medium temperature tank and high temperature heat storage tank respectively through setting up the branch.
The heat storage heat exchanger is provided with a first steam inlet, a first steam outlet, a second steam inlet and a second steam outlet.
Wherein, the heat release heat exchanger is provided with a water inlet and a heating steam outlet.
Wherein, all be provided with the molten salt pump on two first molten salt lateral pipes, second molten salt pipeline and the third molten salt pipeline.
The medium-temperature heat storage tank and the high-temperature heat storage tank are internally divided into an upper heat storage space, a middle heat storage space and a lower heat storage space from top to bottom, heat storage media in the upper heat storage space and the lower heat storage space are sensible heat storage media, and heat storage media in the middle heat storage space are latent heat storage media.
Wherein the material of the sensible heat storage medium is either quartz stone particles or stone blocks.
Wherein the material of the latent heat storage medium is a phase change material.
The shape of the combination of the materials in the upper layer heat storage space, the middle layer heat storage space and the lower layer heat storage space is porous medium.
The steam source of the heat storage heat exchanger is main steam, reheat steam or steam extracted from a steam turbine.
The utility model has the following beneficial effects:
according to the utility model, by setting the three heat storage temperatures of high, medium and low temperatures, the flow of heat storage medium participating in heat storage and heat release is reduced, so that higher heat storage temperature is obtained, and the heat supply temperature is improved;
by configuring latent heat for heat storage, the heat storage density is improved, the investment of a heat storage tank is reduced, and the occupied area of a heat storage system is reduced;
two sections of heat storage and two sections of heat release are configured, and energy levels are well matched, so that energy is utilized in a gradient manner, and the energy utilization efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present utility model;
fig. 2 is a schematic diagram of a cross-sectional structure of the heat storage tank of the present utility model.
The reference numerals in the drawings are as follows:
1. a medium temperature heat storage tank; 2. a high temperature heat storage tank; 3. a heat storage heat exchanger; 4. a heat release heat exchanger; 5. a molten salt pump; 6. an upper layer heat storage space; 7. a middle layer heat storage space; 8. a lower layer heat storage space; 31. a first steam inlet; 32. a first steam outlet; 33. a second steam inlet; 34. a second steam outlet; 41. a feed water inlet; 42. and a heating steam outlet.
Detailed Description
The utility model will now be described in detail with reference to the drawings and to specific embodiments.
Referring to fig. 1 and 2, the utility model provides a technical scheme:
a multistage heat storage system based on a heat supply thermal power unit comprises a medium temperature heat storage tank 1 and a high temperature heat storage tank 2, wherein a first molten salt inlet and a first molten salt outlet are formed in the upper part and the lower part of the medium temperature heat storage tank 1, and a second molten salt inlet and a second molten salt outlet are formed in the upper part and the lower part of the high temperature heat storage tank 2; the first molten salt outlet and the second molten salt outlet at the lower parts of the medium temperature heat storage tank 1 and the high temperature heat storage tank 2 are both connected with first molten salt branch pipes, the tail ends of the two first molten salt branch pipes are communicated with first molten salt pipes, the other ends of the first molten salt pipes are communicated with heat storage molten salt inlets of the heat storage heat exchanger 3, the heat storage heat exchanger 3 is provided with the first heat storage molten salt outlet which is communicated with the medium temperature molten salt pipes, the heat storage heat exchanger 3 is connected to the first molten salt inlets at the upper part of the medium temperature heat storage tank 1 through the medium temperature molten salt pipes, the second heat storage molten salt outlet on the heat storage heat exchanger 3 is connected with the high temperature molten salt pipes, the heat storage heat exchanger 3 is connected to the second molten salt inlets at the upper part of the high temperature heat storage tank 2 through the high temperature molten salt pipes, the first molten salt outlet at the upper part of the medium-temperature heat storage tank 1 is communicated with the first heat release molten salt inlet of the heat release heat exchanger 4 through a second molten salt pipeline, the second molten salt outlet at the upper part of the high-temperature heat storage tank 2 is connected to the second heat release molten salt inlet of the heat release heat exchanger 4 through a third molten salt pipeline, two first molten salt branch pipelines, the second molten salt pipeline and the third molten salt pipeline are all provided with molten salt pumps 5, the molten salt pumps 5 are used for conveying molten salt, the heat release heat exchanger 4 is provided with a water supply inlet 41 and a heat supply steam outlet 42, the heat release molten salt outlet of the heat release heat exchanger 4 is communicated with a molten salt outlet pipeline, and the molten salt outlet pipeline is respectively communicated with the first molten salt inlet and the second molten salt inlet at the lower parts of the medium-temperature heat storage tank 1 and the high-temperature heat storage tank 2 through setting branches.
The heat storage heat exchanger 3 is provided with a first steam inlet 31, a first steam outlet 32, a second steam inlet 33 and a second steam outlet 34, the first steam inlet 31, the first steam outlet 32, the second steam inlet 33 and the second steam outlet 34 are connected with steam-water pipelines, and respectively convey main steam and reheat steam from a main system for providing a heat storage heat source, and the output of the second steam outlet 34 of the heat storage heat exchanger 3 can be steam or hydrophobic.
As a preference, the heat storage heat exchanger 3 and the heat release heat exchanger 4 are counter-flow heat exchangers in order to obtain a higher heat storage, heat release temperature.
The inside of the medium-temperature heat storage tank 1 and the inside of the high-temperature heat storage tank 2 are respectively divided into an upper heat storage space 6, a middle heat storage space 7 and a lower heat storage space 8 from top to bottom, heat storage media in the upper heat storage space 6 and the lower heat storage space 8 are sensible heat storage media, and heat storage media in the middle heat storage space 7 are latent heat storage media. The material of the sensible heat storage medium is either quartz stone particles or stone blocks; the material of the latent heat storage medium is a phase change material. The shape of the material combination in the upper layer heat storage space 6, the middle layer heat storage space 7 and the lower layer heat storage space 8 is porous medium, and the porous medium is provided with a passage for molten salt to flow up and down.
The height of the middle-layer heat storage space 7 is respectively larger than that of the upper-layer heat storage space 6 and the lower-layer heat storage space 8, the output temperature of the middle-layer heat storage space 7 is stabilized in a certain range by filling phase-change materials, the corresponding input and output temperatures of the heat storage tank can be obtained through the selection of the phase-change materials, a temperature jump layer can be formed on a certain height of the middle-temperature heat storage tank 1 or the high-temperature heat storage tank 2 in the molten salt flowing process, and molten salt above the temperature jump layer and molten salt below the temperature jump layer are obviously layered.
Preferably, the steam source of the heat storage heat exchanger 3 is main steam, reheat steam or steam extracted from a steam turbine.
The working principle of the multi-stage heat storage system based on the heat supply thermal power unit is as follows:
and in the heat storage working condition, the molten salt pump 5 on the first molten salt branch pipeline at the lower parts of the medium-temperature heat storage tank 1 and the high-temperature heat storage tank 2 runs, and cold molten salt in the medium-temperature heat storage tank 1 and the high-temperature heat storage tank 2 is continuously pumped out from the bottom of the tank and enters the heat storage heat exchanger 3.
A part of molten salt exchanges heat with main steam to form medium-temperature molten salt, and the medium-temperature molten salt enters a first molten salt inlet at the upper part of the medium-temperature heat storage tank 1 through a medium-temperature molten salt pipeline of the heat storage heat exchanger 3; the other part of molten salt continuously exchanges heat with reheat steam to form high-temperature molten salt, and the high-temperature molten salt enters a second molten salt inlet at the upper part of the high-temperature heat storage tank 2 through a high-temperature molten salt pipeline of the heat storage heat exchanger 3; the heat storage media in the medium-temperature heat storage tank 1 and the high-temperature heat storage tank 2 continuously absorb heat, and due to the multi-layer distribution of the heat storage media, low-temperature fluid is continuously taken away along with the downward flow of the high-temperature heat transfer media, and the temperature step layer continuously moves downwards until the temperature step layer reaches the bottom of the heat storage tank, so that the heat storage capacity is maximum.
And in the exothermic working condition, a molten salt pump 5 of a second molten salt pipeline and a third molten salt pipeline at the upper parts of the medium-temperature heat storage tank 1 and the high-temperature heat storage tank 2 runs, hot molten salt in the medium-temperature heat storage tank 1 and the high-temperature heat storage tank 2 is continuously pumped out from the top of the tank and enters a heat release heat exchanger 4, a part of the high-temperature molten salt exchanges heat with water supply to heat the water supply into saturated steam, the temperature of the high-temperature molten salt is reduced to form medium-temperature molten salt, and the medium-temperature molten salt entering the heat release heat exchanger 4 are combined and then continue to exchange heat with the saturated steam, and heat is supplied to the outside after the saturated steam is heated into superheated steam. The molten salt after heat exchange forms low-temperature molten salt which enters a first molten salt inlet and a second molten salt inlet at the lower parts of the medium-temperature heat storage tank 1 and the high-temperature heat storage tank 2 respectively through a molten salt outlet pipeline communicated with a heat release molten salt outlet of the heat release heat exchanger 4. The heat storage media in the medium-temperature heat storage tank 1 and the high-temperature heat storage tank 2 continuously release heat, and due to the multi-layer distribution of the heat storage media, high-temperature fluid is continuously taken away along with the upward flow of low-temperature heat transfer media, and the temperature step layer continuously moves upwards until the temperature step layer reaches the top of the heat storage tank, so that the heat release capacity is maximum.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (9)
1. A multistage heat storage system based on heat supply thermal power unit, its characterized in that: including medium temperature heat storage tank (1), high temperature heat storage tank (2), medium temperature heat storage tank (1) and high temperature heat storage tank (2) lower part all communicate there is first fused salt lateral conduit, and two first fused salt lateral conduits communicate through first fused salt pipeline, first fused salt pipeline other end intercommunication has heat storage heat exchanger (3), heat storage heat exchanger (3) are connected to the upper portion of medium temperature heat storage tank (1) through setting up medium temperature fused salt pipeline, be connected to the upper portion of high temperature heat storage tank (2) through setting up high temperature fused salt pipeline on heat storage heat exchanger (3), medium temperature heat storage tank (1) upper portion is connected to heat release heat exchanger (4) through the second fused salt pipeline, heat release heat exchanger (4) communicate there is the fused salt outlet pipe, the fused salt outlet pipe is connected to the lower part of medium temperature heat storage tank (1) and high temperature heat storage tank (2) respectively through setting up the branch.
2. A multi-stage heat storage system based on a thermal power generating unit for supplying heat as set forth in claim 1, wherein: the heat storage heat exchanger (3) is provided with a first steam inlet (31), a first steam outlet (32), a second steam inlet (33) and a second steam outlet (34).
3. A multi-stage heat storage system based on a thermal power generating unit for supplying heat as set forth in claim 2, wherein: the heat release heat exchanger (4) is provided with a water supply inlet (41) and a heat supply steam outlet (42).
4. A multi-stage thermal storage system based on a thermal power generating unit for supplying heat as set forth in claim 3, wherein: and molten salt pumps (5) are arranged on the two first molten salt branch pipelines, the second molten salt pipeline and the third molten salt pipeline.
5. A multi-stage thermal storage system based on a thermal power generating unit for supplying heat as defined in claim 4, wherein: the medium-temperature heat storage tank (1) and the high-temperature heat storage tank (2) are internally divided into an upper heat storage space (6), a middle heat storage space (7) and a lower heat storage space (8) from top to bottom, heat storage media in the upper heat storage space (6) and the lower heat storage space (8) are sensible heat storage media, and heat storage media in the middle heat storage space (7) are latent heat storage media.
6. A multi-stage thermal storage system based on a thermal power generating unit for supplying heat as recited in claim 5, wherein: the material of the sensible heat storage medium is either quartz stone particles or stone blocks.
7. A multi-stage thermal storage system based on a thermal power generating unit for supplying heat as defined in claim 6, wherein: the material of the latent heat storage medium is a phase change material.
8. A multi-stage thermal storage system based on a thermal power generating unit for supplying heat as recited in claim 7, wherein: the shape of the inner material combination of the upper layer heat storage space (6), the middle layer heat storage space (7) and the lower layer heat storage space (8) is porous medium.
9. A multi-stage thermal storage system based on a thermal power generating unit for supplying heat as recited in claim 8, wherein: the steam source of the heat storage heat exchanger (3) is main steam, reheat steam or steam extracted from a steam turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322269969.6U CN220793974U (en) | 2023-08-23 | 2023-08-23 | Multistage heat storage system based on heat supply thermal power unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322269969.6U CN220793974U (en) | 2023-08-23 | 2023-08-23 | Multistage heat storage system based on heat supply thermal power unit |
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| CN220793974U true CN220793974U (en) | 2024-04-16 |
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| CN202322269969.6U Active CN220793974U (en) | 2023-08-23 | 2023-08-23 | Multistage heat storage system based on heat supply thermal power unit |
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- 2023-08-23 CN CN202322269969.6U patent/CN220793974U/en active Active
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