CN210399547U - Fused salt emptying device of fused salt linear Fresnel type heat collector - Google Patents
Fused salt emptying device of fused salt linear Fresnel type heat collector Download PDFInfo
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- CN210399547U CN210399547U CN201921468602.4U CN201921468602U CN210399547U CN 210399547 U CN210399547 U CN 210399547U CN 201921468602 U CN201921468602 U CN 201921468602U CN 210399547 U CN210399547 U CN 210399547U
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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
- Y02E10/44—Heat exchange systems
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Abstract
The utility model discloses a fused salt emptying devices of linear fei nieer formula heat collector of fused salt, include air compressor and sweep the mechanism, the inlet end and the air compressor that sweep the mechanism pass through gas transmission pipeline intercommunication, the fused salt input tube intercommunication of the end of giving vent to anger and the linear fei nieer formula heat collector return circuit of fused salt that sweeps the mechanism. When the heat collector stops working, the device is started, the air compressor compresses air and sweeps the air into the fused salt linear Fresnel type heat collector loop through the sweeping mechanism, and liquid fused salt is swept away from the heat collecting tube, so that the condition that no fused salt is left in the heat collecting tube and is solidified basically at night or under other non-heat absorption conditions is guaranteed, and the smoothness in the heat collecting tube is guaranteed when the heat collecting tube is started next time. The heat dissipation loss caused by an anti-condensation mode that the molten salt forcibly circularly flows in the heat collecting pipe is avoided, and higher photo-thermal power generation capacity can be obtained.
Description
Technical Field
The utility model belongs to the technical field of the solar photothermal utilization, especially, relate to a fused salt unloading device of linear fei nieer formula heat collector of fused salt.
Background
At present, the research and project construction of the domestic solar thermal power generation technology are just rising, the fused salt linear Fresnel type solar heat collection technical route has the advantages of strong wind resistance, good heat collection stability and the like, and a plurality of fused salt linear Fresnel solar thermal power generation projects which are built or under construction are provided at home and abroad, so that the fused salt linear Fresnel solar thermal power generation technical route is one of indispensable technical routes in the field of solar thermal power generation.
Because the light condensation precision of the fused salt linear Fresnel type heat collector is relatively slightly low, the diameter of the heat collecting tube is 125mm, which is larger than that of the groove type heat collecting tube, and the heat dissipation area is larger; meanwhile, the freezing point of the binary molten salt for the photo-thermal power station is 220 ℃ or above, and in order to prevent the molten salt from being frozen in the heat collecting pipe at night or under other non-heat-absorption conditions, the molten salt at 290-310 ℃ flows in the heat collecting pipe in a forced circulation manner. The heat collecting pipe which has no heat preservation and large heat dissipation area in the open air causes that the molten salt which circularly flows in the heat collecting pipe radiates and dissipates heat to the outside very greatly. According to calculation, the heat dissipation loss of the heat collection tube of the fused salt linear Fresnel type photo-thermal power generation accounts for more than 25% of the heat absorption capacity. Whether the fused salt can be safely and properly blown away from the heat collecting pipe at night or under other non-heat-absorption conditions or not is avoided, the heat loss caused by forced circulation is avoided, and no proper solution is provided at home and abroad.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a fused salt emptying devices of linear fei nieer formula heat collector of fused salt to no fused salt remains in the thermal-arrest pipe and solidifies when keeping stopping, the unblocked in the thermal-arrest pipe when ensureing to start next time.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a fused salt emptying devices of linear fei nieer formula heat collector of fused salt, includes air compressor and sweeps the mechanism, sweep the inlet end of mechanism and air compressor and pass through gas transmission pipeline intercommunication, sweep the fused salt input tube intercommunication of giving vent to anger end and the linear fei nieer formula heat collector return circuit of fused salt of mechanism.
When the heat collector stops working, the device is started, the air compressor compresses air and sweeps the air into the fused salt linear Fresnel type heat collector loop through the sweeping mechanism, and liquid fused salt is swept away from the heat collecting tube, so that the condition that no fused salt is left in the heat collecting tube and is solidified basically at night or under other non-heat absorption conditions is guaranteed, and the smoothness in the heat collecting tube is guaranteed when the heat collecting tube is started next time. The heat dissipation loss caused by an anti-condensation mode that the molten salt forcibly circularly flows in the heat collecting pipe is avoided, and higher photo-thermal power generation capacity can be obtained.
As a further improvement of the above technical solution:
the blowing mechanism is a blowing pipe, and the highest point of the blowing pipe is higher than that of the heat collecting pipe in the fused salt linear Fresnel type heat collector loop. And when the compressed air is decompressed, the molten salt can not flow back into the gas transmission pipeline and solidify and block the gas transmission pipeline.
In order to ensure the purging effect, the purging pipe comprises an inclined pipe communicated with the molten salt input pipe, and the included angle between the inclined pipe and the molten salt input pipe is not more than 45 degrees.
As a concrete structure of the purging pipe, the purging pipe further comprises an ascending pipe communicated with the gas transmission pipeline, a horizontal pipe communicated with the ascending pipe, and a descending pipe communicated with the horizontal pipe, wherein the lower end of the descending pipe is communicated with the upper end of the inclined pipe. Ensure that the height of the horizontal pipe is higher than that of the heat collecting pipe, and prevent the molten salt from flowing back. The purging tube is preferably a heat-resistant stainless steel tube.
And electric tracing devices are arranged on the outer walls of the descending pipe and the inclined pipe. The temperature of the pipe section is maintained at not less than 280 ℃, so that a small amount of molten salt entering the pipe section does not solidify.
And a first valve is arranged at the position of the ascending pipe close to the gas transmission pipeline. To control the input of compressed air.
And a second valve is arranged at the position of the inclined pipe close to the molten salt input pipe. Molten salt backflow is prevented.
And an outlet of the air storage tank is communicated with an air inlet end of the blowing mechanism through an air transmission pipeline.
In order to ensure that the compressed air is heated to a temperature of above 280 ℃, an outlet of the air storage tank is provided with an air heater, and an outlet of the air heater is communicated with an air inlet end of the blowing mechanism through an air transmission pipeline.
The air heater, the air storage tank and the air transmission pipeline are preferably made of stainless steel with 304 or higher rust-proof grade, and are provided with drainage measures during starting and stopping. The pressure of the compressed air passing through the air heater is about 0.8MPa, and the outlet temperature of the compressed air reaches over 280 ℃.
The air compressor is preferably a screw oil-free air compressor, and has no rear cooling device, the outlet pressure of the air compressor reaches more than 0.8MPa, and the outlet temperature of the air compressor reaches more than 120 ℃; preferably, more than 2 screw oil-free air compressors are arranged, and 1 screw oil-free air compressor is reserved.
The blowing mechanism is provided with a plurality of blowing mechanisms, and the blowing mechanisms are in one-to-one correspondence with a plurality of loops of the fused salt linear Fresnel type heat collector.
Compared with the prior art, the utility model has the advantages of:
1. can make oil-free compressed air pressurized, heated to above the fused salt freezing point through this device, sweep to the linear fei nieer formula heat collector return circuit of fused salt, the fused salt can not be polluted by conventional air compressor's lubricating oil, and can be effectual rapidly sweeps away the thermal-collecting tube with liquid fused salt.
2. The device can effectively prevent molten salt from flowing back to enter a compressed air pipeline, a small amount of molten salt flowing back to the injection opening can be insulated and not solidified through the local electric tracing device, and certain fault tolerance is achieved.
3. By the device, molten salt in the heat collecting pipe can be quickly and properly blown to the molten salt main pipe at night or under other non-heat-absorption conditions, unnecessary heat dissipation loss is remarkably reduced, and effective heat collection amount is increased by more than 25%.
4. The device has relatively mature equipment and components, the cost of the process and the equipment is far less than the increased power generation benefit, and the economy is strong.
Drawings
Fig. 1 is a schematic structural diagram of a molten salt emptying device of a molten salt linear fresnel type heat collector according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the purge tube in the embodiment of the present invention.
Illustration of the drawings: 1. an air compressor; 2. a gas storage tank; 3. an air heater; 4. a gas pipeline; 5. a first valve; 6. a purge tube; 61. an inclined tube; 62. a down pipe; 63. a horizontal tube; 64. an ascending pipe; 7. a second valve; 8. an electric tracing device; 9. a loop; 91. a molten salt input pipe; 92. a heat collecting pipe.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
Example 1:
as shown in fig. 1 and 2, the molten salt emptying device of the molten salt linear fresnel heat collector of the embodiment includes an air compressor 1, an air storage tank 2 and an air heater 3 which are sequentially communicated through pipelines, compressed air in the air storage tank 2 is conveyed to a plurality of purging pipes 6 through an air conveying pipeline 4, and the plurality of purging pipes 6 are in one-to-one correspondence with a plurality of loops 9 of the molten salt linear fresnel heat collector.
The purging pipe 6 includes an inclined pipe 61 communicating with the molten salt input pipe 91, an ascending pipe 64 communicating with the gas transmission pipeline 4, a horizontal pipe 63 communicating with the ascending pipe 64, and a descending pipe 62 communicating with the horizontal pipe 63, and a lower end of the descending pipe 62 communicates with an upper end of the inclined pipe 61. The ascending pipe 64 is provided with a first valve 5 at a position close to the gas transmission pipeline 4, and the inclined pipe 61 is provided with a second valve 7 at a position close to the molten salt input pipe 91. The highest point of the purging pipe 6 is higher than the highest point of the heat collecting pipe 92 in the fused salt linear fresnel type heat collector loop 9, that is, the height of the horizontal pipe 63 is higher than that of the heat collecting pipe 92. And the included angle between the inclined pipe 61 and the fused salt input pipe 91 is less than or equal to 45 degrees.
The outer walls of the down pipe 62 and the inclined pipe 61 are provided with electric tracing devices 8. Specifically, as shown in fig. 2, the electric trace band of the electric trace device 8 is wound around the tube walls of the down tube 62 and the inclined tube 61.
The air is sequentially pressurized to more than 0.8MPa and heated to more than 280 ℃ through an air compressor 1 and an air heater 3, and the pressure is stabilized through an air storage tank 2; the molten salt is sent to the vicinity of a Fresnel type heat collector loop 9 through a gas transmission pipeline 4, and is respectively connected into the Fresnel type heat collector loop 9 through a first valve 5 (a blowing pipeline compressed air valve), a blowing pipe 6, a second valve 7 (a blowing pipeline molten salt valve) and an electric heat tracing device 8 at a blowing angle of 45 degrees or lower. The compressed air has the temperature of 280 ℃, can melt a small amount of fused salt, and can safely and quickly sweep the fused salt out of the heat collecting pipe by utilizing the pressure of the fused salt. The high point of the purging pipeline is arranged at the purging pipe 6 and is higher than the height of the heat collecting pipe 92 of the fused salt linear Fresnel type heat collector loop 9, so that when the compressed air is decompressed, the fused salt backflow cannot enter the loop purging pipeline purging pipe 6, and fused salt solidification and blockage are caused.
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.
Claims (10)
1. The utility model provides a fused salt emptying devices of linear fei nieer formula heat collector of fused salt, its characterized in that, includes air compressor (1) and sweeps the mechanism, the inlet end that sweeps the mechanism passes through gas transmission pipeline (4) with air compressor (1) and communicates, the end of giving vent to anger that sweeps the mechanism communicates with fused salt input tube (91) of the linear fei nieer formula heat collector return circuit of fused salt (9).
2. Molten salt emptying device of a molten salt linear fresnel type heat collector according to claim 1, characterized in that the purging mechanism is a purging tube (6), the highest point of the purging tube (6) being higher than the highest point of the heat collecting tube (92) in the molten salt linear fresnel type heat collector circuit (9).
3. The molten salt emptying device of the molten salt linear Fresnel type heat collector according to claim 2 is characterized in that the purging pipe (6) comprises an inclined pipe (61) communicated with the molten salt input pipe (91), and an included angle α between the inclined pipe (61) and the molten salt input pipe (91) is not less than 45 degrees.
4. The molten salt emptying device of the molten salt linear Fresnel type heat collector according to claim 2 is characterized in that the purging pipe (6) further comprises an ascending pipe (64) communicated with the gas transmission pipeline (4), a horizontal pipe (63) communicated with the ascending pipe (64), and a descending pipe (62) communicated with the horizontal pipe (63), wherein the lower end of the descending pipe (62) is communicated with the upper end of the inclined pipe (61).
5. The molten salt emptying device of the molten salt linear Fresnel type heat collector according to claim 4 is characterized in that an electric tracing device (8) is arranged on the outer wall of the descending pipe (62) and the inclined pipe (61).
6. Molten salt emptying device of a molten salt linear Fresnel type heat collector according to claim 4, characterized in that a first valve (5) is arranged at the position, close to the gas transmission pipeline (4), of the ascending pipe (64).
7. Molten salt emptying device of a molten salt linear Fresnel type heat collector according to claim 4, characterized in that a second valve (7) is arranged at the position of the inclined pipe (61) close to the molten salt input pipe (91).
8. The molten salt emptying device of the molten salt linear Fresnel type heat collector according to any one of claims 1 to 7, characterized in that an air storage tank (2) is arranged at an outlet of the air compressor (1), and an outlet of the air storage tank (2) is communicated with an air inlet end of the blowing mechanism through an air transmission pipeline (4).
9. The molten salt emptying device of the molten salt linear Fresnel type heat collector according to claim 8 is characterized in that an air heater (3) is arranged at an outlet of the air storage tank (2), and an outlet of the air heater (3) is communicated with an air inlet end of the purging mechanism through an air conveying pipeline (4).
10. The molten salt emptying device of the molten salt linear Fresnel type heat collector according to any one of claims 1 to 7, wherein a plurality of blowing mechanisms are arranged, and correspond to a plurality of loops (9) of the molten salt linear Fresnel type heat collector one by one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921468602.4U CN210399547U (en) | 2019-09-04 | 2019-09-04 | Fused salt emptying device of fused salt linear Fresnel type heat collector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921468602.4U CN210399547U (en) | 2019-09-04 | 2019-09-04 | Fused salt emptying device of fused salt linear Fresnel type heat collector |
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| CN210399547U true CN210399547U (en) | 2020-04-24 |
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| CN201921468602.4U Active CN210399547U (en) | 2019-09-04 | 2019-09-04 | Fused salt emptying device of fused salt linear Fresnel type heat collector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530039A (en) * | 2019-09-04 | 2019-12-03 | 中国电建集团中南勘测设计研究院有限公司 | A kind of the fused salt emptying device and method of fused salt linear Fresnel formula heat collector |
| CN115493302A (en) * | 2022-11-21 | 2022-12-20 | 兰州大成科技股份有限公司 | Method for emptying heat transfer working medium of line focusing heat collecting system and line focusing heat collecting system thereof |
-
2019
- 2019-09-04 CN CN201921468602.4U patent/CN210399547U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530039A (en) * | 2019-09-04 | 2019-12-03 | 中国电建集团中南勘测设计研究院有限公司 | A kind of the fused salt emptying device and method of fused salt linear Fresnel formula heat collector |
| CN115493302A (en) * | 2022-11-21 | 2022-12-20 | 兰州大成科技股份有限公司 | Method for emptying heat transfer working medium of line focusing heat collecting system and line focusing heat collecting system thereof |
| CN115493302B (en) * | 2022-11-21 | 2023-01-17 | 兰州大成科技股份有限公司 | Method for emptying heat transfer working medium of line focusing heat collecting system and line focusing heat collecting system thereof |
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