CN117128782A - Staggered flue gas fused salt heat exchanger and fused salt heat storage system - Google Patents
Staggered flue gas fused salt heat exchanger and fused salt heat storage system Download PDFInfo
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- CN117128782A CN117128782A CN202311116019.8A CN202311116019A CN117128782A CN 117128782 A CN117128782 A CN 117128782A CN 202311116019 A CN202311116019 A CN 202311116019A CN 117128782 A CN117128782 A CN 117128782A
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- molten salt
- heat exchanger
- flue gas
- header
- salt
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- 150000003839 salts Chemical class 0.000 title claims abstract description 262
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 239000003546 flue gas Substances 0.000 title claims abstract description 75
- 238000005338 heat storage Methods 0.000 title claims abstract description 16
- 238000007599 discharging Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000008014 freezing Effects 0.000 abstract description 3
- 238000007710 freezing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Classifications
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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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
- F28D1/05316—Assemblies of conduits connected to common headers, e.g. core type radiators
- F28D1/05325—Assemblies of conduits connected to common headers, e.g. core type radiators with particular pattern of flow, e.g. change of flow direction
-
- 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
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
-
- 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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a staggered flue gas molten salt heat exchanger and a molten salt heat storage system, wherein the heat exchanger comprises a plurality of transversely arranged upper headers and a plurality of transversely arranged lower headers, and the upper headers and the lower headers are staggered along the flue gas flowing direction; the molten salt outflow part of the upper header is communicated with the opposite molten salt inflow part of the lower header through a vertical pipe row, and the molten salt outflow part of the lower header is communicated with the opposite molten salt inflow part of the upper header through a vertical pipe row; the lower header at the head position in the lower header is provided with a molten salt inlet, the upper header at the tail position in the upper header is communicated with the molten salt header, and the molten salt header is provided with a molten salt outlet; the flue gas inlet and the fused salt outlet of the heat exchanger are positioned on the same side, and the flue gas outlet and the fused salt inlet of the heat exchanger are positioned on the same side. The heat exchanger effectively solves the problems of salt freezing, complex pipeline arrangement, low heat exchange coefficient and the like of the flue gas molten salt heat exchanger.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a flue gas molten salt heat exchanger for heating molten salt through gases such as flue gas and the like. The invention also relates to a fused salt heat storage system provided with the flue gas fused salt heat exchanger.
Background
At present, in a novel power system, high-proportion renewable energy source digestion is a necessary way for realizing a double-carbon target, and an energy storage technology plays an important pivot role in the whole energy system, so that the method is an effective method for truly realizing source-load decoupling.
The traditional power generation technology and the new energy power generation technology of the coupling molten salt heat storage technology can play a key role in a novel power system as a flexible peak shaving power supply. For example, the solar photo-thermal power generation with heat storage can bear the power grid peak regulation task, and the thermal power unit with the heat storage by the coupling molten salt can greatly improve the flexibility and the peak regulation capacity of the unit. In an energy storage system, the performance of a heat exchanger serving as a part for transferring energy between different media is particularly important, and the flue gas molten salt heat exchanger is one of core parts for energy conversion in the coupling of a thermal power unit and a molten salt heat storage system.
The related technology mainly utilizes the modes that molten salt flows through a serpentine coil pipe, flows through a Z-shaped pipeline with gradient, a spiral pipeline with gradient and the like from top to bottom, so that the problem of blockage of the molten salt in the pipeline in the shutdown process is restrained, and the flow of the molten salt in a heat exchanger is increased to increase the temperature rise of the molten salt.
However, the above related art has the following drawbacks:
firstly, setting a certain gradient on a fused salt pipeline can solve the problem of salt blockage caused by frozen salt to a certain extent, and theoretically, the gravity of the fused salt can overcome the flow resistance of the fused salt in the pipeline to finish salt unloading. However, as the viscosity of the molten salt is large, and a certain negative pressure is formed in the pipeline after the molten salt pump is stopped, the flow resistance of the molten salt is increased, and the molten salt cannot completely flow out of the pipeline by means of the gravity of the molten salt. In the shutdown process of the heat exchanger, the problem of salt blockage caused by frozen salt is unavoidable.
Second, single tube flow increases the risk of heat exchanger outages. Once salt is blocked somewhere in the pipeline, molten salt cannot flow in the heat exchanger, and operation faults are caused.
And moreover, the Z-shaped pipeline with the gradient has larger pipeline spacing, and the larger the gradient of the pipeline is, the larger the spacing is. The heat exchanger with the single-tube spiral structure has limited number and length of pipelines, which is not beneficial to heat exchange of flue gas and molten salt. The heat exchangers with the two structures obviously increase the size of the heat exchanger under the condition of the same molten salt flow, and are not beneficial to reasonable space arrangement of the heat exchanger. Meanwhile, the Z-shaped heat exchanger structure is unfavorable for tail flue gas to heat fused salt in the pipeline through convection heat exchange.
Furthermore, when salt blockage occurs in the heat exchanger, the whole pipeline system or the whole tube plate has to be replaced, so that the maintenance cost is high.
Disclosure of Invention
The invention aims to provide a staggered flue gas molten salt heat exchanger so as to solve the technical problems.
The invention further aims at providing a molten salt heat storage system provided with the staggered flue gas molten salt heat exchanger.
In order to achieve the above purpose, the invention provides a staggered flue gas molten salt heat exchanger, which comprises a plurality of upper headers and a plurality of lower headers, wherein the upper headers and the lower headers are transversely arranged, and the upper headers and the lower headers are staggered along the flow direction of flue gas; the molten salt outflow part of the upper header is communicated with the opposite molten salt inflow part of the lower header through a vertical pipe row, and the molten salt outflow part of the lower header is communicated with the opposite molten salt inflow part of the upper header through a vertical pipe row; the lower header at the head position in the lower header is provided with a molten salt inlet, the upper header at the tail position in the upper header is communicated with the molten salt header, and the molten salt header is provided with a molten salt outlet; the flue gas inlet and the fused salt outlet of the heat exchanger are positioned on the same side, and the flue gas outlet and the fused salt inlet of the heat exchanger are positioned on the same side.
In one embodiment, the tube array comprises a plurality of tube sheets, each of the tube sheets comprising a plurality of parallel vertical tubes.
In one embodiment, the molten salt upper header is in an inverted V shape, and an included angle between the molten salt inflow part and the molten salt outflow part is 2-4 degrees.
In one embodiment, the molten salt lower header is V-shaped, and the included angle between the molten salt inflow portion and the molten salt outflow portion is 2 ° to 4 °.
In one embodiment, the apex of the upper header is communicated with the molten salt header through a first branch pipeline, and a vent valve is arranged on the first branch pipeline communicated with the molten salt header.
In one embodiment, the lower point of the lower header is communicated with a molten salt outlet pipeline of the molten salt header through a second branch pipeline, and a salt discharging valve is arranged on the second branch pipeline.
In one embodiment, the vent valve and the salt rejection valve are in a closed state during operation of the heat exchanger, and in an open state during salt rejection of the heat exchanger.
In one embodiment, the lower header tank at the head position has only the molten salt outflow portion, and the upper header tank at the tail position has only the molten salt inflow portion.
In one embodiment, the molten salt header is located at a higher position than the upper header.
In order to achieve the other purpose, the invention provides a molten salt heat storage system, which comprises a cold salt tank, a hot salt tank and a flue gas molten salt heat exchanger, wherein the flue gas molten salt heat exchanger is used for heating molten salt in the cold salt tank through flue gas and then storing the heated molten salt in the hot salt tank, and the flue gas molten salt heat exchanger is the staggered flue gas molten salt heat exchanger.
According to the staggered flue gas molten salt heat exchanger provided by the invention, the upper header and the lower header are staggered along the flue gas flowing direction, the molten salt outflow part of the upper header is communicated with the molten salt inflow part of the lower header through the vertical tube bank, and the molten salt outflow part of the lower header is communicated with the molten salt inflow part of the upper header through the vertical tube bank. Like this, just formed the molten salt circulation path that continuous snake went on one's way, made the molten salt have bigger flow in the heat exchanger is inside, and moreover, the flue gas import and the molten salt export of heat exchanger are located same one side, the flue gas export and the molten salt import of heat exchanger are located same one side, and the flue gas flows along the horizontal direction and blows through vertically bank of tubes, can make flue gas and molten salt realize high-efficient heat transfer, and the molten salt can heat up fast and the intensification amplitude is higher, has higher heat transfer coefficient. In addition, the tube bank is vertically arranged in the heat exchanger, and a plurality of parallel pipelines are contained in one tube bank, so that salt unloading can be completed quickly and efficiently, the situation that the heat exchanger cannot work normally due to blockage of a certain pipeline is avoided, and meanwhile, molten salt pipelines are reasonably arranged in the heat exchanger, so that reasonable utilization of space in the heat exchanger is realized.
The molten salt heat storage system provided by the invention is provided with the staggered flue gas molten salt heat exchanger, and the staggered flue gas molten salt heat exchanger has the technical effects, so that the molten salt heat storage system provided with the staggered flue gas molten salt heat exchanger also has the corresponding technical effects.
Drawings
Fig. 1 is a schematic structural diagram of a staggered flue gas molten salt heat exchanger according to an embodiment of the present invention;
FIG. 2 is a view A-A of the staggered flue gas molten salt heat exchanger shown in FIG. 1;
FIG. 3 is a partial view B-B of the staggered flue gas molten salt heat exchanger of FIG. 1.
In the figure:
10. the upper header 11, the molten salt inflow portion 12, the molten salt outflow portion 20, the lower header 21, the molten salt inflow portion 22, the molten salt outflow portion 30, the tube bank 31, the tube 40, the molten salt header 41, the molten salt outlet pipeline 50, the first branch pipeline 51, the vent valve 60, the second branch pipeline 61, and the salt discharging valve
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 this document, the terms "upper, lower, head, tail" 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 it is not to be construed as an 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 to 3, fig. 1 is a schematic structural diagram of a staggered flue gas molten salt heat exchanger according to an embodiment of the present invention; FIG. 2 is a view A-A of the staggered flue gas molten salt heat exchanger shown in FIG. 1; FIG. 3 is a partial view B-B of the staggered flue gas molten salt heat exchanger of FIG. 1.
As shown in the figure, in a specific embodiment, the staggered flue gas molten salt heat exchanger provided by the invention is provided with four upper headers 10 and four lower headers 20 which are transversely arranged, wherein the upper headers 10 and the lower headers 20 are staggered along the flue gas flowing direction, the molten salt outflow part of the upper header 10 is communicated with the molten salt inflow part of the opposite lower header 20 through a vertical pipe row 30, the molten salt outflow part of the lower header 10 is communicated with the molten salt inflow part of the opposite upper header 10 through a vertical pipe row 30, and the molten salt flows vertically in the pipe row 30 (see vertical arrow in fig. 1).
Specifically, the molten salt upper header 10 is in an inverted "V" shape, the angle between the molten salt inflow portion 11 and the molten salt outflow portion 12 thereof is 2 ° to 4 °, in this embodiment, the angle between the molten salt inflow portion 11 and the molten salt outflow portion 12 of the upper header 10 is 2 °, similarly to the molten salt upper header 10, the molten salt lower header 20 is in a "V" shape, the angle between the molten salt inflow portion 21 and the molten salt outflow portion 22 thereof is 2 ° to 4 °, and in this embodiment, the angle between the molten salt inflow portion 21 and the molten salt outflow portion 22 of the lower header 20 is 2 °.
The molten salt upper header 10 is designed into an inverted V shape, and can form a shape similar to a ridge, so that when salt is discharged, molten salt flows from the middle to two sides along an inclined plane by utilizing gravity, the salt discharging efficiency is improved, and the problems of unsmooth salt discharging or dead angle of salt discharging and the like are avoided; the molten salt lower header 20 is designed into a V shape, and can be shaped like a funnel, so that when salt is discharged, molten salt flows from two edges to the middle along the inclined plane, the salt discharging efficiency is improved, and the problems of unsmooth salt discharging or dead angle of salt discharging and the like are avoided.
Here, in order to keep the head and tail ends of the heat exchanger flush, the lower header 20 at the head position of the four lower headers has only the right half portion, only the molten salt outflow portion 22, and the upper header 10 at the tail position of the four upper headers 10 has only the left half portion, only the molten salt inflow portion 11.
The lower header 20 at the head position in the lower header 20 is provided with a molten salt inlet for communicating with a cold salt tank, low-temperature molten salt output from the cold salt tank can enter the heat exchanger from the molten salt inlet of the lower header 20, the upper header 10 at the tail position in the upper header 10 is communicated with the molten salt header 40, the molten salt header 40 plays a role in collecting molten salt, the position of the molten salt header 40 is higher than the upper header 10 by a certain distance, the molten salt header 40 is provided with a molten salt outlet pipeline 41, and the molten salt outlet pipeline 41 is used for communicating with a hot salt tank so as to store heated molten salt in the hot salt tank.
As can be seen from the figure, the flue gas inlet and the molten salt outlet of the heat exchanger are located on the same side, the flue gas outlet and the molten salt inlet of the heat exchanger are located on the same side, and the flue gas flowing direction is perpendicular to the flowing direction of the molten salt in the tube bank 30. The molten salt flows along a continuous serpentine path (shown by a dotted line in fig. 1), so that the molten salt has a larger flow path in the heat exchanger, the flue gas flows along the horizontal direction and blows through the vertical tube bank 30 (shown by a dovetail arrow in fig. 1), the flue gas and the molten salt can realize efficient heat exchange, and the molten salt can be quickly heated, has higher heating amplitude and has higher heat exchange coefficient.
Each tube row 30 has a plurality of tube sheets, each tube sheet having a plurality of parallel vertical tubes 31, that is, each tube row 30 is made up of a plurality of parallel tubes 31. When salt freezing or other faults occur in a certain pipeline 31 or part of the pipeline 31, only the pipeline 31 with the faults is needed to be replaced, so that the maintenance cost can be greatly reduced; in addition, in the design process of the heat exchanger, the transverse spacing between the tube rows 30, the longitudinal spacing between the tubes 31 in the tube rows 30 and the size of the tubes 31 can be determined by relevant standards according to resistance conditions such as flue gas flow rate and the like, so that the fused salt tubes 31 can be reasonably arranged in the heat exchanger, and the reasonable utilization of the space in the heat exchanger is realized.
The apex of each upper header 10 is communicated with the molten salt header 40 through a first branch pipe 50, and a vent valve 51 is provided on the first branch pipe 50 communicated with the molten salt header 40.
The lower point of each lower header 20 is connected to the molten salt outlet pipe 41 of the molten salt header 40 through a second branch pipe 60, and a salt discharge valve 61 is provided on the second branch pipe 60.
In the operation process of the heat exchanger, the ventilation valve 51 and the salt discharging valve 61 are in a closed state, in the salt discharging process of the heat exchanger, the ventilation valve 51 and the salt discharging valve 61 are in an open state, molten salt flows into the salt storage tank along the descending pipe through the salt discharging valve 61, so that quick salt discharging is realized, the molten salt is prevented from being blocked in the pipeline 31, after salt discharging is completed, the flue gas side is closed, the flue gas does not enter the heat exchanger any more, and overheating of the heat exchanger due to dry combustion is avoided.
When the heat exchanger is started, the ventilation valve 51 is in an open state, air in the pipeline 31 is discharged into the environment, and the ventilation valve is closed after the air is completely discharged; during operation, the vent valve 51 is in a closed state; when salt is discharged, the vent valve 51 is in an open state, and the gas with pressure in the salt-discharging tank 40 can provide a certain power in the salt-discharging process, so that the salt-discharging of the salt-discharging tank 40 is facilitated.
In practice, the heat exchanger may be installed in a flue of the boiler, such as a main flue or a bypass flue, etc., which, in operation, molten salt enters the heat exchanger from the lower header 20 and molten salt entering the lower header 29 flows into the tubes 31 connected to the lower header 20, respectively. Is distributed into each tube row 30. Taking one group of tube rows 30 as an example, molten salt enters the first group of tube rows 30 from the first lower header 20, flows along the vertical pipeline 31 to reach the first upper header 10, then enters the second group of tube rows 30 downward, and the molten salt is converged to the second lower header 20 by the second group of tube rows 30. In this way the molten salt flows through the remaining tube rows 30, where it merges into the last upper header 10, i.e. the molten salt outlet header, and after flowing out of the heat exchanger outlet, into the molten salt header 40 at the top of the outlet.
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 plurality of upper header tanks 10 or lower header tanks 20 may be of a unitary structure or a split structure, or the like. This is not illustrated here, as there are many possible implementations.
The flue gas molten salt heat exchanger provided by the invention can rapidly and efficiently finish salt unloading, and the tube rows are compact in arrangement, so that molten salt pipelines can be reasonably arranged in the heat exchanger, the reasonable utilization of space in the heat exchanger is facilitated, and the problems of salt freezing, complex pipeline arrangement, low heat exchange coefficient and the like of the flue gas molten salt heat exchanger are effectively solved.
In addition to the staggered flue gas molten salt heat exchanger, the invention further provides a molten salt heat storage system which comprises a cold salt tank, a hot salt tank and a flue gas molten salt heat exchanger, wherein the flue gas molten salt heat exchanger is used for heating molten salt in the cold salt tank through flue gas and then storing the heated molten salt in the hot salt tank, the flue gas molten salt heat exchanger is the staggered flue gas molten salt heat exchanger, and regarding the rest structure of the molten salt heat storage system, please refer to the prior art, and details are not repeated herein.
The staggered flue gas molten salt heat exchanger and the molten salt heat storage system provided by the invention are described in detail. 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 staggered flue gas molten salt heat exchanger is characterized by comprising a plurality of transversely arranged upper headers and a plurality of transversely arranged lower headers, wherein the upper headers and the lower headers are staggered along the flow direction of flue gas; the molten salt outflow part of the upper header is communicated with the opposite molten salt inflow part of the lower header through a vertical pipe row, and the molten salt outflow part of the lower header is communicated with the opposite molten salt inflow part of the upper header through a vertical pipe row; the lower header at the head position in the lower header is provided with a molten salt inlet, the upper header at the tail position in the upper header is communicated with the molten salt header, and the molten salt header is provided with a molten salt outlet; the flue gas inlet and the fused salt outlet of the heat exchanger are positioned on the same side, and the flue gas outlet and the fused salt inlet of the heat exchanger are positioned on the same side.
2. The staggered flue gas molten salt heat exchanger of claim 1, wherein the tube array comprises a plurality of tube sheets, each tube sheet comprising a plurality of parallel vertical tubes.
3. The staggered flue gas molten salt heat exchanger of claim 2, wherein the upper header is inverted V-shaped with an included angle between the molten salt inflow portion and the molten salt outflow portion of 2 ° to 4 °.
4. A staggered flue gas molten salt heat exchanger according to claim 3 wherein the lower header is V-shaped with an included angle between the molten salt inflow and outflow of 2 ° to 4 °.
5. The staggered flue gas molten salt heat exchanger of claim 4, wherein the apex of the upper header is communicated with the molten salt header through a first branch pipeline, and a vent valve is arranged on the first branch pipeline communicated with the molten salt header.
6. The staggered flue gas molten salt heat exchanger of claim 5, wherein the lower point of the lower header is communicated with a molten salt outlet pipeline of the molten salt header through a second branch pipeline, and a salt discharging valve is arranged on the second branch pipeline.
7. The staggered flue gas molten salt heat exchanger of claim 6, wherein during operation of the heat exchanger, the vent valve and the salt rejection valve are in a closed state and during salt rejection of the heat exchanger, the vent valve and the salt rejection valve are in an open state.
8. The staggered flue gas molten salt heat exchanger according to any one of claims 1 to 7, wherein a lower header tank at a head position among the lower header tanks has only a molten salt outflow portion, and an upper header tank at a tail position among the upper header tanks has only a molten salt inflow portion.
9. The staggered flue gas molten salt heat exchanger of claim 8 wherein the molten salt header is located higher than the upper header.
10. The molten salt heat storage system comprises a cold salt tank, a hot salt tank and a flue gas molten salt heat exchanger, wherein the flue gas molten salt heat exchanger is used for heating molten salt in the cold salt tank through flue gas and then storing the heated molten salt in the hot salt tank, and is characterized in that the flue gas molten salt heat exchanger is a staggered flue gas molten salt heat exchanger according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311116019.8A CN117128782B (en) | 2023-08-31 | 2023-08-31 | Staggered flue gas fused salt heat exchanger and fused salt heat storage system |
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| CN202311116019.8A CN117128782B (en) | 2023-08-31 | 2023-08-31 | Staggered flue gas fused salt heat exchanger and fused salt heat storage system |
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| CN117128782A true CN117128782A (en) | 2023-11-28 |
| CN117128782B CN117128782B (en) | 2024-08-02 |
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| JP2004239467A (en) * | 2003-02-04 | 2004-08-26 | Rinnai Corp | Heat exchanger and water heater |
| CN102563867A (en) * | 2012-01-17 | 2012-07-11 | 杭州锅炉集团股份有限公司 | Solar-heating assisted salt melting system |
| CN109579326A (en) * | 2017-09-28 | 2019-04-05 | 上海电气集团股份有限公司 | A kind of thin salt method of the exhaust for fused salt heat dump |
| CN108870787A (en) * | 2018-07-16 | 2018-11-23 | 东方电气集团东方锅炉股份有限公司 | A kind of tower fused salt heat dump compressed air system |
| CN110953737A (en) * | 2019-12-20 | 2020-04-03 | 东方电气集团东方锅炉股份有限公司 | Molten salt heat absorber arrangement method and system for guaranteeing low-load high-flow safe operation |
| CN216204324U (en) * | 2021-11-01 | 2022-04-05 | 常州综研加热炉有限公司 | Gravity emptying type convection tube bundle |
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