CN109579326B - Exhaust salt dredging method for molten salt heat absorber - Google Patents
Exhaust salt dredging method for molten salt heat absorber Download PDFInfo
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- CN109579326B CN109579326B CN201710894259.9A CN201710894259A CN109579326B CN 109579326 B CN109579326 B CN 109579326B CN 201710894259 A CN201710894259 A CN 201710894259A CN 109579326 B CN109579326 B CN 109579326B
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- heat absorber
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 140
- 150000003839 salts Chemical class 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 238000010612 desalination reaction Methods 0.000 claims 1
- 238000010248 power generation Methods 0.000 description 2
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The invention relates to an exhaust salt dredging method for a molten salt heat absorber, wherein the heat absorber comprises an N-stage heat absorber unit, the heat absorber unit is provided with a first end and a second end and comprises: when the heat absorber was started, the fused salt got into the heat absorber, and the air in the heat absorber was discharged includes: opening salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes, enabling a part of molten salt to enter the inlet pipe, enabling the other part of molten salt to enter the heat absorber unit through the salt dredging branch pipes and the second connecting pipe, discharging a part of air through the outlet pipe, and discharging the other part of air through the first connecting pipe and the exhaust branch pipes; and after the air in the heat absorber is exhausted, closing salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes, enabling the molten salt to flow in from the inlet pipe, and enabling the molten salt to sequentially pass through the heat absorber units of each stage through the first connecting pipe and the second connecting pipe so as to enable the molten salt to flow out from the outlet pipe. The invention provides a high-efficiency method for exhausting gas and dispersing salt.
Description
Technical Field
The invention relates to the field of photo-thermal power generation, in particular to an exhaust salt dredging method for a molten salt heat absorber.
Background
The heat absorber is one of core equipment of the tower type solar power generation system. In the heat absorber operation process, in order to ensure the unblocked of the sparse salt pipeline of exhausting, the main mode at present is to make the inside fused salt of heat absorber pass through exhaust pipe line and sparse salt pipeline, realizes the warm pipe of exhaust pipe line and exhaust clean pipeline, guarantees to exhaust and the reliable thermally equivalent of exhaust clean pipeline, maintains the pipeline temperature and is higher than the fused salt freezing point, avoids the jam of pipeline, nevertheless exhaust pipe line and sparse salt pipeline are to the reposition of redundant personnel of fused salt flow, inevitably leads to the fact the loss of heat absorber efficiency.
Chinese patent No. CN104236142A discloses an antifreezing method for a clean exhaust pipeline of a molten salt solar heat absorber, wherein an exhaust branch pipe with a throttle orifice plate is connected to a connecting pipe at the top of the heat absorber, and a plurality of exhaust branch pipes are converged into an exhaust main pipe; one part of the molten salt enters the heat absorber from the top connecting pipe, and the other part of the molten salt enters the exhaust branch pipe through the throttle orifice plate, is collected to the exhaust main pipe and then is discharged, so that the temperature of the pipeline of the exhaust main pipe is maintained to be higher than the solidification point of the molten salt; a connecting pipe at the bottom of the heat absorber is connected with a drain branch pipe with an electric gate valve, a valve plate of the electric gate valve is provided with a throttling hole, and a plurality of drain branch pipes are converged into a drain main pipe; one part of fused salt gets into the heat absorber from the bottom connecting pipe, and another part gets into the exhaust branch pipe through the orifice on the electric valve plate, collects and discharges behind the exhaust manifold, and this patent still can't avoid exhaust pipe line and dredge the reposition of redundant personnel of salt pipeline to the fused salt flow and cause the heat absorber efficiency loss.
Therefore, the prior art also lacks an exhaust salt-dispersing method which is efficiently used for a molten salt heat absorber.
Disclosure of Invention
The invention aims to provide an exhaust salt-dispersing method for a molten salt heat absorber with high efficiency.
In order to solve the technical problems, the technical scheme of the invention is as follows: an exhaust salt rejection method for a molten salt heat sink comprising an N-stage heat sink unit having a first end and a second end, comprising: when the heat absorber was started, the fused salt got into in the heat absorber, discharged the air in the heat absorber includes: opening salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes, enabling a part of molten salt to enter the inlet pipe, enabling the other part of molten salt to enter the heat absorber unit through the salt dredging branch pipes and the second connecting pipe, discharging a part of air through the outlet pipe, and discharging the other part of air through the first connecting pipe and the exhaust branch pipes; after the air in the heat absorber is exhausted, salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes are closed, the molten salt flows in from the inlet pipe, and the molten salt sequentially passes through the heat absorber units of each stage through the first connecting pipe and the second connecting pipe, so that the molten salt flows out from the outlet pipe; the salt dredging branch pipes are connected with the second connecting pipes in a one-to-one corresponding manner; the inlet pipe is connected with the 1 st-stage heat absorber unit, and the outlet pipe is connected with the Nth-stage heat absorber unit; the first connecting pipe communicates with a first end of an adjacent heat absorber unit, the second connecting pipe communicates with a second end of the adjacent heat absorber unit, and the first connecting pipe and the second connecting pipe are staggered.
As a preferable technical scheme, after the heat absorber is shut down, salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes are opened, so that the residual molten salt flows out through the salt dredging branch pipes.
Preferably, the heat absorber unit includes a first header disposed at the first end and a second header disposed at the second end; the first connecting pipe is communicated with the first header of the adjacent heat absorber unit, and the second connecting pipe is communicated with the second header of the adjacent heat absorber unit.
Preferably, the exhaust branch pipe is communicated with the outlet tank.
As an optimal technical scheme, when the heat absorber is started, molten salt enters the heat absorber unit through the salt dredging main pipe and the salt dredging branch pipe, and the salt dredging main pipe is communicated with the inlet tank and the salt dredging branch pipe.
As a preferable technical scheme, after the heat absorber is shut down, salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes are opened, so that the residual molten salt flows back to the inlet tank through the salt dredging branch pipes and the salt dredging main pipe.
As a preferred technical solution, the inlet pipe is connected to a first end of a 1 st-stage heat absorber unit, the first connecting pipe is communicated with first ends of even-numbered stages and the next-stage heat absorber units, and the second connecting pipe is communicated with second ends of odd-numbered stages and the next-stage heat absorber units; the outlet pipe is connected with the first end of the Nth-stage heat absorber unit, wherein N is an even number; or the inlet pipe is connected with the first end of the 1 st-stage heat absorber unit, the first connecting pipe is communicated with the first ends of the even-numbered stage and the next-stage heat absorber unit, and the second connecting pipe is communicated with the second ends of the odd-numbered stage and the next-stage heat absorber unit; the outlet pipe is connected with the second end of the Nth-stage heat absorber unit, wherein N is an odd number; or the inlet pipe is connected with the second end of the 1 st-stage heat absorber unit, the first connecting pipe is communicated with the first ends of the odd-numbered stages and the next-stage heat absorber units, and the second connecting pipe is communicated with the second ends of the even-numbered stages and the next-stage heat absorber units; the outlet pipe is connected with the second end of the Nth-stage heat absorber unit, wherein N is an even number; or the inlet pipe is connected with the second end of the 1 st-stage heat absorber unit, the first connecting pipe is communicated with the first ends of the odd-numbered stages and the next-stage heat absorber units, and the second connecting pipe is communicated with the second ends of the even-numbered stages and the next-stage heat absorber units; the outlet pipe is connected to the first end of the nth stage heat absorber unit, where N is an odd number.
As a preferred technical scheme, if the inlet pipe is connected with the first end of the 1 st-stage heat absorber unit, the heat absorber further comprises an exhaust branch pipe with an exhaust valve, wherein the exhaust branch pipe is connected with the inlet pipe; and if the outlet pipe is connected with the second end of the Nth-stage heat absorber unit, the salt dredging device further comprises a salt dredging branch pipe with a salt dredging valve, wherein the salt dredging branch pipe is connected with the outlet pipe.
Preferably, when the heat absorber is operated, the temperature of each pipeline is kept higher than the melting temperature of the molten salt.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: compared with the prior art, the invention avoids the diversion of the fused salt flow by the heat absorber exhaust pipe and the salt dredging pipe, and avoids the loss of the heat absorber efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
In order to explain technical contents and structural features of the present invention in detail, the following detailed description is given with reference to the embodiments and the accompanying drawings.
As shown in figure 1, the invention provides an exhaust salt-dispersing method for a molten salt heat absorber, wherein the heat absorber is formed by serially connecting 1-N stages of heat absorber units, wherein the value of N is determined according to the power of the heat absorber. The ascending pipe 4 is connected with an inlet tank 5, and an inlet pipe 6 is led out from the inlet tank 5; a first connection pipe 7 at the top of the absorber and a second connection pipe 8 at the bottom of the absorber connect the units of each stage of the absorber to each other in a circuit, and the units of adjacent stages are connected to each other. Specifically, the loop refers to: the top of the heat absorber unit 1 is a first unit header 11, the bottom of the heat absorber unit is a second unit header 12, an inlet pipe 6 is communicated with the top of the first 1 st-stage unit header 11, the second 1 st-stage unit header 12 is communicated with the second 2 nd-stage unit header 12 through a connecting pipe, the first 2 nd-stage unit header is communicated with the first 3 rd-stage unit header until the second nth-stage unit header is communicated with the second nth-1 st-stage unit header, an outlet of the heat absorber is arranged at the top of the nth-stage unit header, and a passage is formed from the inlet pipe 6 to an outlet pipe 18. The first connecting pipe 7 is connected with an exhaust branch pipe 10 with an exhaust valve 9, all the exhaust branch pipes 10 are collected in an outlet tank 16, and a down pipe 17 is communicated with the outlet tank; the second connecting pipe 8 is connected with salt dredging branch pipes 14 with salt dredging valves 15, all the salt dredging branch pipes 14 are converged into a salt dredging main pipe 13, and the salt dredging main pipe 13 is connected with the inlet tank 5. All the pipes should be set at a certain inclination so that the molten salt flows back by its own weight.
In one embodiment, the temperature of the exhaust pipeline and the salt dredging pipeline is higher than the melting temperature of the molten salt by electric tracing in the operation process of the heat absorber, so that the pipeline is prevented from being blocked. Specifically, when the heat absorber is started, all the salt dredging valves 15 and all the exhaust valves 9 are opened, the molten salt enters the second heat absorber unit header through the salt dredging branch pipes 14 and the salt dredging valves 15, and then the air is discharged into the outlet tank 16 through the exhaust valves 9 and the exhaust branch pipes 10. And (3) after the exhaust is finished, closing all the salt dredging valves 15 and all the exhaust valves 9, opening the main loop valves, enabling the molten salt to sequentially pass through all the heat absorber units, and finally flowing into the outlet tank 16 to enter a normal working state. When the heat absorber is shut down, all the valves are opened, so that the residual molten salt flows back to the inlet tank through the salt dredging branch pipe by means of the self gravity.
In another embodiment, the inlet pipe is connected with the first end of the 1 st stage heat absorber unit, the first connecting pipe is communicated with the first ends of the even-numbered stages and the next-stage heat absorber units, and the second connecting pipe is communicated with the second ends of the odd-numbered stages and the next-stage heat absorber units; an outlet pipe is connected with the first end of the Nth-stage heat absorber unit, wherein N is an even number; or,
in another embodiment, the inlet pipe is connected with the first end of the 1 st stage heat absorber unit, the first connecting pipe is communicated with the first ends of the even-numbered stages and the next-stage heat absorber units, and the second connecting pipe is communicated with the second ends of the odd-numbered stages and the next-stage heat absorber units; the outlet pipe is connected with the second end of the Nth-stage heat absorber unit, wherein N is an odd number; or,
in another embodiment, the inlet pipe is connected with the second end of the 1 st stage heat absorber unit, the first connecting pipe is communicated with the first ends of the odd-numbered stages and the subsequent stage heat absorber units thereof, and the second connecting pipe is communicated with the second ends of the even-numbered stages and the subsequent stage heat absorber units thereof; the outlet pipe is connected with the second end of the Nth-stage heat absorber unit, wherein N is an even number; or,
in another embodiment, the inlet pipe is connected with the second end of the 1 st stage heat absorber unit, the first connecting pipe is communicated with the first ends of the odd-numbered stages and the subsequent stage heat absorber units thereof, and the second connecting pipe is communicated with the second ends of the even-numbered stages and the subsequent stage heat absorber units thereof; an outlet duct connects the first ends of the nth stage heat absorber units, where N is an odd number.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. An exhaust salt thinning method for a molten salt heat absorber comprising an N-stage heat absorber unit having a first end and a second end, comprising: when the heat absorber was started, the fused salt got into in the heat absorber, discharged the air in the heat absorber includes: opening salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes, enabling a part of molten salt to enter the inlet pipe, enabling the other part of molten salt to enter the heat absorber unit through the salt dredging branch pipes and the second connecting pipe, discharging a part of air through the outlet pipe, and discharging the other part of air through the first connecting pipe and the exhaust branch pipes; after the air in the heat absorber is exhausted, salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes are closed, the molten salt flows in from the inlet pipe, and the molten salt sequentially passes through the heat absorber units of each stage through the first connecting pipe and the second connecting pipe, so that the molten salt flows out from the outlet pipe; the salt dredging branch pipes are connected with the second connecting pipes in a one-to-one corresponding manner; the inlet pipe is connected with the 1 st-stage heat absorber unit, and the outlet pipe is connected with the Nth-stage heat absorber unit; the first connecting pipe communicates with a first end of an adjacent heat absorber unit, the second connecting pipe communicates with a second end of the adjacent heat absorber unit, and the first connecting pipe and the second connecting pipe are staggered.
2. The exhaust gas salt thinning method for a molten salt heat absorber of claim 1, further comprising: and after the heat absorber is shut down, opening salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes, and enabling the residual molten salt to flow out through the salt dredging branch pipes.
3. The exhaust gas desalination method for a molten salt heat absorber of claim 1, wherein the heat absorber unit comprises a first header tank disposed at the first end and a second header tank disposed at the second end; the first connecting pipe is communicated with the first header of the adjacent heat absorber unit, and the second connecting pipe is communicated with the second header of the adjacent heat absorber unit.
4. The exhaust gas salt-phobic method for a molten salt heat absorber of claim 1, wherein the exhaust branch pipe communicates with an outlet tank.
5. The exhaust salt dredging method for the molten salt heat absorber of claim 1, wherein when the heat absorber is started, the molten salt enters the heat absorber unit through a salt dredging main pipe and the salt dredging branch pipe, and the salt dredging main pipe is communicated with an inlet tank and the salt dredging branch pipe.
6. The exhaust gas salt phobic method for a molten salt heat sink of claim 5, further comprising: and after the heat absorber is shut down, salt dredging valves of all the salt dredging branch pipes and exhaust valves of all the exhaust branch pipes are opened, so that the residual molten salt flows back to the inlet tank through the salt dredging branch pipes and the salt dredging main pipe.
7. The exhaust salt thinning method for the molten salt heat absorber according to claim 1, wherein the inlet pipe is connected to a first end of a 1 st-stage heat absorber unit, the first connecting pipe is communicated with first ends of even-stage and subsequent-stage heat absorber units, and the second connecting pipe is communicated with second ends of odd-stage and subsequent-stage heat absorber units; the outlet pipe is connected with the first end of the Nth-stage heat absorber unit, wherein N is an even number; or the inlet pipe is connected with the first end of the 1 st-stage heat absorber unit, the first connecting pipe is communicated with the first ends of the even-numbered stage and the next-stage heat absorber unit, and the second connecting pipe is communicated with the second ends of the odd-numbered stage and the next-stage heat absorber unit; the outlet pipe is connected with the second end of the Nth-stage heat absorber unit, wherein N is an odd number; or the inlet pipe is connected with the second end of the 1 st-stage heat absorber unit, the first connecting pipe is communicated with the first ends of the odd-numbered stages and the next-stage heat absorber units, and the second connecting pipe is communicated with the second ends of the even-numbered stages and the next-stage heat absorber units; the outlet pipe is connected with the second end of the Nth-stage heat absorber unit, wherein N is an even number; or the inlet pipe is connected with the second end of the 1 st-stage heat absorber unit, the first connecting pipe is communicated with the first ends of the odd-numbered stages and the next-stage heat absorber units, and the second connecting pipe is communicated with the second ends of the even-numbered stages and the next-stage heat absorber units; the outlet pipe is connected to the first end of the nth stage heat absorber unit, where N is an odd number.
8. The exhaust salt dredging method for the molten salt heat absorber according to claim 7, wherein the inlet pipe is connected with a first end of the 1 st-stage heat absorber unit, and further comprises an exhaust branch pipe with an exhaust valve connected with the inlet pipe, while the outlet pipe is connected with a second end of the Nth-stage heat absorber unit, and further comprises a salt dredging branch pipe with a salt dredging valve connected with the outlet pipe.
9. The exhaust gas salt thinning method for a molten salt heat absorber of any one of claims 1 to 8, further comprising: and when the heat absorber operates, keeping the temperature of each pipeline higher than the melting temperature of the molten salt.
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| CN201710894259.9A CN109579326B (en) | 2017-09-28 | 2017-09-28 | Exhaust salt dredging method for molten salt heat absorber |
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| CN201710894259.9A CN109579326B (en) | 2017-09-28 | 2017-09-28 | Exhaust salt dredging method for molten salt heat absorber |
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| CN109579326B true CN109579326B (en) | 2020-07-14 |
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| CN101240947A (en) * | 2008-02-19 | 2008-08-13 | 上海工电能源科技有限公司 | Self-adapting solar energy heat collection molten salt receiver system |
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| CN204128229U (en) * | 2014-10-11 | 2015-01-28 | 东方电气集团东方锅炉股份有限公司 | A kind of defroster of fused salt solar heat absorber emptying gas exhaust piping |
| CN104632557A (en) * | 2013-11-08 | 2015-05-20 | 阿尔斯通技术有限公司 | System and method for controlling molten salt temperature |
| CN205642101U (en) * | 2016-04-28 | 2016-10-12 | 双良节能系统股份有限公司 | Solar energy photo -thermal system's vertical heat exchanger structures |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10254012B2 (en) * | 2015-09-08 | 2019-04-09 | Peter B. Choi | Sensible thermal energy storage (STES) systems |
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2017
- 2017-09-28 CN CN201710894259.9A patent/CN109579326B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240947A (en) * | 2008-02-19 | 2008-08-13 | 上海工电能源科技有限公司 | Self-adapting solar energy heat collection molten salt receiver system |
| CN101999061A (en) * | 2008-04-21 | 2011-03-30 | 大金工业株式会社 | Heat exchanger unit |
| CN104632557A (en) * | 2013-11-08 | 2015-05-20 | 阿尔斯通技术有限公司 | System and method for controlling molten salt temperature |
| CN104236142A (en) * | 2014-10-11 | 2014-12-24 | 东方电气集团东方锅炉股份有限公司 | Anti-freezing method of fused salt solar heat absorber emptying and exhausting pipeline |
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