CN213119565U - Temperature regulating and recycling system for fused salt heat absorber - Google Patents
Temperature regulating and recycling system for fused salt heat absorber Download PDFInfo
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- CN213119565U CN213119565U CN202021831320.9U CN202021831320U CN213119565U CN 213119565 U CN213119565 U CN 213119565U CN 202021831320 U CN202021831320 U CN 202021831320U CN 213119565 U CN213119565 U CN 213119565U
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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 utility model discloses a temperature regulation and recirculation system of a fused salt heat absorber, which comprises a fused salt heating unit and a temperature regulation and recirculation unit, wherein the fused salt heating unit comprises an inlet buffer tank, a heated surface of the fused salt heat absorber and an outlet buffer tank which are connected in sequence through pipelines; the temperature-adjusting recycling unit comprises a recycling subunit and a temperature-adjusting subunit, the recycling subunit can convey part of high-temperature molten salt in the outlet buffer tank to the inlet buffer tank, and the temperature-adjusting subunit can convey part of high-temperature molten salt in the outlet buffer tank or part of low-temperature molten salt in the inlet buffer tank to the heating surface of the molten salt heat absorber. The utility model discloses can carry out the working medium as required with the hot salt recirculation of export buffer tank to the import buffer tank in participating in the recirculation or getting into the fused salt heat absorber and being heated the face and adjust the temperature, also can cause the cold salt in the import buffer tank to carry out the working medium and adjust the temperature and then realize the two-way operation of adjusting the temperature of hot salt heat absorber system in the fused salt heat absorber is heated the face simultaneously.
Description
Technical Field
The utility model relates to a solar photothermal power's technical field, more specifically say, relate to a fused salt heat absorber that is used for tower solar photothermal power fused salt heat absorber adjusts temperature and recirculation system.
Background
The fused salt heat absorber system is a core part in the fused salt tower type solar photothermal power station light-gathering heat collecting system, a heated surface of the fused salt heat absorber positioned at the top of the heat absorbing tower receives high-energy solar radiation from a light-gathering field of the heliostat and transfers heat to fused salt flowing in the heat absorbing pipe, and the heated high-temperature fused salt is conveyed to the rear end for use. Tower type light condensation technology can realize up to 1200kW/m2The radiation heat flow density is over 1100 ℃, the theoretical heating temperature is over 1100 ℃, the operation condition of the heat absorber system is complex and severe, and the safety control requirement is high.
More molten salt heat absorber auxiliary systems, such as a heat absorber inlet buffer tank and an outlet buffer tank, an accident compressed air system and the like, need to be arranged for ensuring the operation reliability of the molten salt heat absorber system. When the molten salt heat absorber normally works, the inlet temperature of the molten salt heat absorber is generally 290 ℃, and the outlet temperature of the heat absorber is 560 ℃.
The following problems are mainly to be solved when the existing molten salt heat absorber system operates: firstly, the fused salt outlet temperature of a heat absorber system in the start-stop or low-load (such as only a heliostat in a local mirror field is available) operation stage is not easy to reach the design value sometimes, and may only be maintained at 300 ℃ or 400 ℃, in order to ensure the safety of the heat absorber and the maximum use of solar energy when the system is started and stopped quickly, a limit temperature value is generally selected for system operation control during design, namely when the fused salt outlet temperature is lower than the limit (such as 370 ℃), the fused salt is circulated into a low-temperature fused salt tank, hot salt and cold salt are mixed and then enter the inlet of the heat absorber again, and although the heat absorber can be normally circulated, the energy is wasted or the start-stop time is influenced; secondly, when the illumination intensity is insufficient or the heat distribution is uneven, the wall surface operation temperature of the heat absorber is possibly low, and then the internal molten salt is crystallized; thirdly, sometimes, in order to ensure that the temperature of the molten salt in the wall surface of the heat absorber is maintained above the crystallization point, the input amount of the heliostat needs to be increased on the local heat absorbing surface to cause the wall surface overtemperature to endanger the operation safety of equipment; and fourthly, the control of the working medium temperature is complex and has obvious lag only through the circulation flow change and heliostat input adjustment due to the longer molten salt heat absorption flow.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem that exists among the prior art, the utility model provides a not only can participate in fused salt heat absorber heating surface secondary heat absorption with its recirculation when heat absorber export fused salt temperature does not reach the designing requirement, can realize fused salt heat absorber heating surface working medium temperature bidirectional regulating's fused salt heat absorber temperature regulation and recirculation system in addition.
To this end, the utility model provides a temperature-regulating and recycling system of a fused salt heat absorber, which comprises a fused salt heating unit and a temperature-regulating recycling unit, wherein,
the molten salt heating unit comprises an inlet buffer tank, a molten salt heat absorber heating surface and an outlet buffer tank which are sequentially connected through pipelines;
the temperature-adjusting recycling unit comprises a recycling subunit and a temperature-adjusting subunit, the recycling subunit can convey part of high-temperature molten salt in the outlet buffer tank to the inlet buffer tank, and the temperature-adjusting subunit can convey part of high-temperature molten salt in the outlet buffer tank or part of low-temperature molten salt in the inlet buffer tank to the heating surface of the molten salt heat absorber.
According to the utility model discloses fused salt heat absorber adjusts temperature and an embodiment of recirculation system, the recirculation subelement is including arranging the recirculation fused salt pump on the export buffer tank and connecting the fused salt recirculation pipeline of recirculation fused salt pump and import buffer tank.
According to the utility model discloses an embodiment of fused salt heat absorber temperature regulation and recirculation system, the recirculation subunit is still including setting up check valve in the fused salt recirculation pipeline, the check valve is close to the setting of recirculation fused salt pump.
According to the utility model discloses fused salt heat absorber adjusts temperature and an embodiment of recirculation system, the subunit that adjusts temperature is including connecting fused salt recirculation pipeline and fused salt flow control valve of setting in the pipeline that adjusts temperature of receiving the hot side with the heated surface of fused salt heat absorber.
According to the utility model discloses fused salt heat absorber adjusts temperature and an embodiment of recirculation system, the import buffer tank links to each other and is connected with fused salt heat absorber heating surface through the access connection pipeline with low temperature fused salt storage tank through last tower pipeline, still is provided with accident compressed air on the import buffer tank and introduces the pipeline.
According to the utility model discloses fused salt heat absorber adjusts temperature and an embodiment of recirculation system, the export buffer tank links to each other and is connected with fused salt heat absorber heating surface through export connecting tube way with high temperature fused salt storage tank through tower pipeline down.
According to the utility model discloses fused salt heat absorber adjusts temperature and an embodiment of recirculation system, go up the tower pipeline and be provided with the bypass pipeline down between the tower pipeline.
According to the utility model discloses fused salt heat absorber adjusts temperature and an embodiment of recirculation system, the fused salt heat absorber heating surface still be provided with the drain pipe that the lower tower pipeline links to each other.
The utility model provides a temperature regulating system and high temperature fused salt recirculation system for tower solar photothermal power fused salt heat absorber, the hot salt recirculation that exports the buffer tank during operation carries out the working medium in participating in the recirculation or getting into the fused salt heat absorber heating surface as required and adjusts the temperature to import buffer tank, also can cause the cold salt in the buffer tank of importing simultaneously to carry out the working medium in the fused salt heat absorber heating surface and adjust the temperature and then realize the two-way operation of adjusting the temperature of hot salt heat absorber system.
Drawings
Fig. 1 shows a schematic structural view of a molten salt heat absorber attemperation and recirculation system according to an exemplary embodiment of the present disclosure.
Description of reference numerals:
1-upper column piping; 2-an inlet buffer tank; 3-connecting an inlet with a pipeline; 4-heating surface of molten salt heat absorber; 5-an outlet connecting pipeline; 6-outlet buffer tank; 7-a bypass conduit; 8-clearing the pipeline; 9-lower tower piping; 10-accident compressed air introduction pipe; 11-a molten salt recirculation conduit; 12-a recirculating molten salt pump; 13-a heating surface temperature regulating pipeline; 14-molten salt flow regulating valve; 15-one-way valve.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Fig. 1 shows a schematic structural view of a molten salt heat absorber attemperation and recirculation system according to an exemplary embodiment of the present disclosure.
As shown in fig. 1, according to an exemplary embodiment of the present invention, the molten salt heat absorber temperature regulation and recirculation system includes a molten salt heating unit and a temperature regulation and recirculation unit, wherein the molten salt heating unit heats low-temperature molten salt to obtain high-temperature molten salt; the temperature adjusting and recycling unit can recycle the high-temperature molten salt at the outlet of the heat absorber to participate in secondary heat absorption of the heating surface of the molten salt heat absorber or introduce low-temperature molten salt to the heating surface of the molten salt heat absorber for adjusting the temperature of the working medium when the temperature of the high-temperature molten salt at the outlet of the heat absorber does not meet the design requirement, so that the temperature of the working medium in the hot salt heat absorber system can be adjusted in two.
Specifically, the molten salt heating unit comprises an inlet buffer tank 2, a molten salt heat absorber heating surface 4 and an outlet buffer tank 6 which are connected in sequence through pipelines. Wherein, the inlet buffer tank 2 is connected with a low-temperature molten salt storage tank (not shown) through an upper tower pipeline 1 and is connected with a heated surface 4 of the molten salt heat absorber through an inlet connecting pipeline 3, and an accident compressed air introducing pipeline 10 is further arranged on the inlet buffer tank 2.
The pipeline 1 of the upper tower is positioned at the foremost end of the system and is connected with a low-temperature molten salt storage tank to be used as a channel for conveying low-temperature molten salt into an inlet buffer tank 2 of the system. The rear end of the upper tower pipeline 1 is an inlet buffer tank of the fused salt heat absorber, and the rear end of the upper tower pipeline is connected with a heating surface 4 of the fused salt heat absorber through an inlet connecting pipeline 3. Wherein the emergency compressed air inlet pipe 10 provided on the inlet buffer tank 2 can be used for providing an initial pressure and establishing an operating pressure at the start of the system.
The outlet buffer tank 6 is connected with a high-temperature molten salt storage tank (not shown) through a lower tower pipeline 9 and is connected with the molten salt heat absorber heating surface 4 through an outlet connecting pipeline 5. The low-temperature molten salt from the front end of the system exchanges heat in the heating surface 4 of the molten salt heat absorber, then enters the outlet buffer tank 6 through the outlet connecting pipe 5, the lower end of the outlet buffer tank 6 is connected with the lower tower pipeline 9, and the qualified high-temperature molten salt is conveyed to the high-temperature molten salt storage tank.
The utility model discloses a recirculation unit adjusts temperature includes the recirculation subunit and adjusts temperature the subunit, the recirculation subunit can carry the part high temperature fused salt in the buffer tank 6 of exporting to import buffer tank 2 and carry out the secondary heating, the subunit that adjusts temperature can carry the part high temperature fused salt in the buffer tank 6 of exporting to fused salt heat absorber receiving surface 4 and carry out the working medium and adjust temperature (transfer and increase) and can carry the part low temperature fused salt in the buffer tank of importing to fused salt heat absorber receiving surface 4 and carry out the working medium and adjust temperature (transfer and reduce), the recirculation unit that adjusts temperature of course launches when fused salt outlet temperature does not reach the design value preferably. Above-mentioned structure has utilized cold and hot medium to mix and directly adjusts the temperature, and not only control is simple and the speed that adjusts the temperature is faster, guarantees the outlet temperature of fused salt heat absorber moreover more easily.
Wherein the recirculation sub-unit comprises a recirculation molten salt pump 12 arranged on the outlet buffer tank 6 and a molten salt recirculation conduit 11 connecting the recirculation molten salt pump 12 with the inlet buffer tank 2. Therefore, high-temperature molten salt can be conveyed into the inlet buffer tank 2 at the front end of the system through the molten salt recirculation pipeline 11, and mixed with cold and hot molten salt and then enters the heating surface 4 of the molten salt heat absorber to participate in heat exchange. In order to prevent that low temperature fused salt from getting into export buffer tank 6, the utility model discloses a recirculation subunit is still including setting up check valve 15 in fused salt recirculation pipeline 11, and check valve 15 can also control the switching of pipeline and what draw forth of fused salt volume except the flow direction of control fused salt, and check valve 15 preferably sets up near recirculation fused salt pump 12.
According to the utility model discloses, the subunit adjusts the temperature including the heated surface pipeline 13 and the fused salt flow control valve 14 of setting in the heated surface pipeline 13 that adjusts the temperature that connects fused salt recirculation pipeline 11 and fused salt heat absorber heated surface 4. From this, the hot salt that comes from the molten salt recirculating pump also can get into in the molten salt heat absorber heated surface 4 and carry out the working medium and adjust the temperature (transfer and increase), can also lead the low temperature molten salt in the buffer tank of import to in the molten salt heat absorber heated surface 4 and carry out the working medium and adjust the temperature (transfer and decrease) certainly, and molten salt flow control valve 14 can control the how much of the molten salt volume that adjusts the temperature, and it can specifically be according to actual operating mode adjustment molten salt introduction volume.
The system can ensure that the tube panel of the heating surface of the fused salt heat absorber is not over-heated and can prevent the medium in the tube panel from crystallizing due to the temperature lower than the melting point of the medium by the arrangement of the recycling subunit. In addition, the arrangement of the molten salt recirculation pipeline can recirculate the molten salt of the outlet buffer tank to the inlet buffer tank to participate in circulation so as to save pumping work of the low-temperature pump, and the start-stop time of the system can be effectively shortened and the availability ratio can be improved after the initial temperature of the molten salt is improved through the high-temperature molten salt recirculation.
In addition, a bypass pipeline 7 can be arranged between the upper tower pipeline 1 and the lower tower pipeline 9 in the system according to process requirements, so that the molten salt does not pass through the system when the system fails, and the maintenance is convenient. And the lowest point of the heating surface 4 of the molten salt heat absorber is also preferably provided with a drain pipeline 8 connected with a lower tower pipeline 9 so as to drain all the molten salt in the heating surface of the molten salt heat absorber for convenient maintenance when the heating surface of the molten salt heat absorber fails.
It is further preferred that each pipeline in the system can be arranged to smoothly drain molten salt in the system according to the self-weight potential energy.
The present invention will be further described with reference to the following specific embodiments.
A molten salt heat absorber temperature control system and a recirculation system according to the present invention will be described with reference to fig. 1 as an example.
The upper tower pipeline 1 conveys low-temperature molten salt in a low-temperature molten salt storage tank (not shown) into an inlet buffer tank 2, and the molten salt in the tank enters a heating surface 4 of a molten salt heat absorber through an inlet connecting pipeline 3 to absorb heat. The inlet buffer tank 2 is also connected with an accident compressed air inlet pipe 10 which is used for providing initial pressure and establishing operating pressure when the system is started.
The high-temperature molten salt heated by the heating surface 4 of the molten salt heat absorber enters an outlet buffer tank 6 through an outlet connecting pipeline 5, maintains a certain liquid level in the tank and is conveyed to a high-temperature molten salt storage tank (not shown) through a lower tower pipeline 9 connected with the lower end of the outlet buffer tank.
A fused salt heating surface temperature adjusting pipeline 13 and a fused salt recycling pipeline 11 are arranged among the inlet buffer tank 2, the outlet buffer tank 6 and the fused salt heat absorber heating surface 4, and when the temperature of a medium in the fused salt heat absorber heating surface 4 needs to be recycled or increased, a fused salt recycling pump 12 arranged on the outlet buffer tank 6 conveys a proper amount of high-temperature fused salt to the inlet buffer tank 2 or the fused salt heat absorber heating surface 4 through the fused salt recycling pipeline 11 and the fused salt temperature adjusting pipeline 13; if the medium temperature in the heating surface 4 of the molten salt heat absorber needs to be reduced, a proper amount of cold salt is introduced into the heating surface 4 of the molten salt heat absorber from the inlet buffer tank 2 through the high-temperature molten salt recirculation pipe 11 and the molten salt temperature adjusting pipeline 13 to complete working medium temperature adjustment. In order to accurately control the temperature-adjusting molten salt amount, a molten salt flow adjusting valve 14 is arranged on the molten salt temperature-adjusting pipeline 13. A check valve 15 is arranged on the outlet pipeline of the recycling molten salt pump 12, namely the molten salt recycling pipeline 11, so as to prevent low-temperature molten salt from entering the outlet buffer tank 6.
A bypass pipeline 7 is arranged between the upper tower pipeline 1 and the lower tower pipeline 9 near the bottom of the system according to process requirements, a drain pipeline 8 is arranged at the lowest point of the heating surface of the molten salt heat absorber, and other systems without the molten salt drain pipes can be drained through molten salt self-weight potential energy when being arranged.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (8)
1. A molten salt heat absorber temperature regulation and recirculation system is characterized by comprising a molten salt heating unit and a temperature regulation and recirculation unit, wherein,
the molten salt heating unit comprises an inlet buffer tank, a molten salt heat absorber heating surface and an outlet buffer tank which are sequentially connected through pipelines;
the temperature-adjusting recycling unit comprises a recycling subunit and a temperature-adjusting subunit, the recycling subunit can convey part of high-temperature molten salt in the outlet buffer tank to the inlet buffer tank, and the temperature-adjusting subunit can convey part of high-temperature molten salt in the outlet buffer tank or part of low-temperature molten salt in the inlet buffer tank to the heating surface of the molten salt heat absorber.
2. The molten salt heat absorber tempering and recycling system of claim 1, said recycling sub-unit comprising a recycling molten salt pump arranged on an outlet buffer tank and a molten salt recycling conduit connecting said recycling molten salt pump with an inlet buffer tank.
3. The molten salt heat absorber tempering and recycling system of claim 2, said recycling sub-unit further comprising a one-way valve disposed in said molten salt recycling conduit, said one-way valve disposed proximate to a recycled molten salt pump.
4. The molten salt heat absorber temperature regulating and recycling system according to claim 2, wherein the temperature regulating subunit comprises a heating surface temperature regulating pipeline connecting the molten salt recycling pipeline and the heating surface of the molten salt heat absorber, and a molten salt flow regulating valve arranged in the heating surface temperature regulating pipeline.
5. The molten salt heat absorber temperature regulating and recycling system according to claim 1, wherein the inlet buffer tank is connected with the low-temperature molten salt storage tank through an upper tower pipeline and is connected with the heating surface of the molten salt heat absorber through an inlet connecting pipeline, and an accident compressed air introducing pipeline is further arranged on the inlet buffer tank.
6. The molten salt heat absorber tempering and recycling system of claim 5, wherein said outlet buffer tank is connected to a high temperature molten salt storage tank by a lower tower conduit and to a molten salt heat absorber heating surface by an outlet connection conduit.
7. The molten salt heat absorber tempering and recycling system of claim 6, wherein a bypass conduit is disposed between said upper and lower tower conduits.
8. The molten salt heat absorber temperature conditioning and recycling system of claim 6, wherein the molten salt heat absorber heating surface is further provided with a drain conduit connected to the lower tower conduit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021831320.9U CN213119565U (en) | 2020-08-28 | 2020-08-28 | Temperature regulating and recycling system for fused salt heat absorber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021831320.9U CN213119565U (en) | 2020-08-28 | 2020-08-28 | Temperature regulating and recycling system for fused salt heat absorber |
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| CN213119565U true CN213119565U (en) | 2021-05-04 |
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| CN202021831320.9U Active CN213119565U (en) | 2020-08-28 | 2020-08-28 | Temperature regulating and recycling system for fused salt heat absorber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432319A (en) * | 2021-05-27 | 2021-09-24 | 浙江中控太阳能技术有限公司 | Solar heat absorption system, photo-thermal power station and operation method |
| CN114111070A (en) * | 2021-11-24 | 2022-03-01 | 东方电气集团东方锅炉股份有限公司 | Export buffer tank of fused salt heat absorber |
-
2020
- 2020-08-28 CN CN202021831320.9U patent/CN213119565U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432319A (en) * | 2021-05-27 | 2021-09-24 | 浙江中控太阳能技术有限公司 | Solar heat absorption system, photo-thermal power station and operation method |
| CN114111070A (en) * | 2021-11-24 | 2022-03-01 | 东方电气集团东方锅炉股份有限公司 | Export buffer tank of fused salt heat absorber |
| CN114111070B (en) * | 2021-11-24 | 2023-08-18 | 东方电气集团东方锅炉股份有限公司 | Outlet buffer tank of fused salt heat absorber |
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