CN109945509B - Solar heat collecting pipe structure with external getter device - Google Patents
Solar heat collecting pipe structure with external getter device Download PDFInfo
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- CN109945509B CN109945509B CN201711389471.6A CN201711389471A CN109945509B CN 109945509 B CN109945509 B CN 109945509B CN 201711389471 A CN201711389471 A CN 201711389471A CN 109945509 B CN109945509 B CN 109945509B
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- tube
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- heat collecting
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- getter device
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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
Abstract
A solar heat collecting pipe structure with an external getter device comprises a stainless steel pipe, a glass pipe and the getter device which are coaxially arranged; two ends of the glass tube are respectively connected with the metal joints in a sealing mode along the axial direction, the metal joints are welded with the elastic expansion joints, the elastic expansion joints are welded with the metal rings, and the metal rings are welded with the stainless steel tube, so that a cavity is formed between the stainless steel tube and the glass tube, and the metal joints are radially provided with guide pipes communicated with the cavity; the getter device is coaxially arranged on the outer side of the glass tube and is provided with an annular cavity formed by an inner wall and an outer wall, one end of the annular cavity is closed, the other end of the annular cavity is provided with an end enclosure, the tail end of the end enclosure is provided with a clamping ring, and the getter is arranged in the annular cavity and is limited by the clamping ring; the inner wall and the outer wall of the getter device are respectively provided with a hole at the corresponding position, the hole on the inner wall is connected with the conduit on the metal joint, and the hole on the outer wall is connected with the tail connecting pipe. The invention can improve the performance and reliability of the heat collecting pipe, is easy to disassemble and has shorter exhaust time.
Description
Technical Field
The invention relates to a solar heat collecting pipe structure with an external getter device, which is particularly suitable for the technical requirements of solar heat power generation by adopting heat conduction oil, molten salt and DSC heat conduction media.
Background
The solar heat collecting tube is a core component of a solar heat power generation technology, the groove type heat collecting tube or the Fresnel type heat collecting tube collects sunlight to the heat collecting tube through a linear reflector, heat exchange is carried out through a medium flowing in the heat collecting tube, and the flowing medium heats water to generate steam or directly generates the steam to push a steam turbine to generate power. The solar heat collecting tube is characterized in that a typical solar heat collecting tube adopts concentric stainless steel tubes and glass tubes as an inner tube and an outer tube respectively, wherein the outer wall of the stainless steel tube is generally plated with a heat absorption coating to improve the heat absorption efficiency of the heat collecting tube, and the outer wall and the inner wall of the glass tube are plated with antireflection films to improve the light transmittance of the glass tube. The end part of the glass tube is sealed with metal and then welded with the elastic expansion joint, the linear expansion difference between the stainless steel tube and the glass tube after the heat collection tube is heated is compensated through the elastic expansion joint, and finally the glass tube is welded with the stainless steel tube inside and vacuumized to form a vacuum interlayer, so that the heat loss caused by heat conduction and convection is reduced. A device with a non-evaporable getter is generally placed in the vacuum interlayer, and can absorb hydrogen and other gases in the vacuum interlayer after being activated at high temperature, so that the vacuum interlayer of the heat collecting tube maintains higher vacuum degree (generally 10)-2Pa～10-1Pa), heat loss of the heat collecting pipe is reduced.
In the technical field, materials such as Zr-V-Fe, Zr-Co-RE, Zr-Y-Fe and the like are commonly pressed into sheet elements, the sheet elements are placed in a circular ring-shaped or box-shaped open container, placed at the position of a corrugated pipe or on the outer wall of a stainless steel pipe of a heat collecting pipe, and activated to absorb air by baking heating or high-frequency heating, such as CN1720419B and CN 1862143B. The conventional technology has the problems that the non-evaporable getter has rapid attenuation of hydrogen absorption amount above 400 ℃, and the getter is higher than the temperature caused by placing the getter on the outer wall of a corrugated pipe or a steel pipe; another problem is that the getter can cause the getter material powder particles to fall off due to air suction during the use process and gather at the bottom of the glass tube of the heat collecting tube, and the risk of the getter being heated by the gathered sunlight to cause local overheating of the heat collecting tube and breakage of the glass tube exists. Utility model CN202008244U discloses an external getter box, arranges the evacuation tail pipe in thermal-collecting tube tip in, is connected with a glass getter box through a conduction pipe in the tail pipe side, is provided with the lens hood in the periphery of getter box. The getter box is made of glass and is hung on the side face of the tail pipe of the heat collecting pipe, so that on one hand, the getter box cannot be activated in the exhaust process of the existing heat collecting pipe production, and needs to be activated after the heat collecting pipe is stopped, the process is complex and is not beneficial to improving vacuum; on the other hand, the overlong tail connecting pipe and the suspended glass air suction box obviously increase the risk of damage of the heat collecting pipe; in addition, the whole air suction box is connected with the heat collecting tube only through the long tail connecting tube, the rest air suction box is exposed in the atmosphere, the temperature of the getter is close to the room temperature, the air suction performance of the getter is reduced, and the getter is easily poisoned by residual nitrogen, carbon monoxide and other gases in the heat collecting tube.
Disclosure of Invention
Aiming at the problems of overhigh temperature of a getter, defects of a glass tail pipe, failure caused by focusing and heating of a mirror surface on the end part of a heat collecting pipe and the like in the prior art, the invention aims to provide a solar heat collecting pipe structure with an external getter device, and the solar heat collecting pipe structure has better vacuum maintaining performance, light and heat collecting performance and weather resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a solar heat collecting tube structure with an external getter device comprises a stainless steel tube, a glass tube and the getter device which are coaxially arranged, wherein the stainless steel tube is used as an inner tube of the heat collecting tube, and the glass tube is used as an outer tube of the heat collecting tube;
two ends of the glass tube are respectively connected with the metal joint in a sealing mode along the axial direction, the other end of the metal joint is welded with the elastic expansion joint, the other end of the elastic expansion joint is welded with the metal ring, the other end of the metal ring is welded with the stainless steel tube, so that a cavity is formed between the stainless steel tube and the glass tube, and a guide tube communicated with the cavity is arranged on the metal joint in the radial direction;
the getter device is coaxially arranged on the outer side of the glass tube and is positioned at a position covering the metal joint, the elastic expansion joint and the metal ring, the getter device is provided with an annular cavity formed by an inner wall and an outer wall, one end of the annular cavity is closed, the other end of the annular cavity is provided with an end socket, the tail end of the end socket is provided with a clamping ring, and the getter is arranged in the annular cavity and is limited by the clamping ring at the tail end of the end socket; the inner wall and the outer wall of the getter device are respectively provided with a hole at the corresponding position, the hole on the inner wall is connected with a conduit on the metal joint through welding, and the hole on the outer wall is connected with a tail connecting pipe.
Wherein, the outer wall of the stainless steel tube can be selectively plated with a heat absorption coating, and the inner wall and the outer wall of the glass tube can be selectively plated with antireflection films.
The metal joint material includes but is not limited to kovar alloy matched with glass linear expansion coefficient or unmatched stainless steel, and can also be a welding combination of the two. Corrugated pipes are used as elastic expansion joints.
The annular cavity of the getter device is positioned at the position covering the metal joint, the elastic expansion joint and the metal ring, and the length of the annular cavity can cover the glass-metal sealing position, so that the annular cavity plays roles of end heat preservation and light shield.
Preferably, the inner diameter of the inner wall of the getter device is 3-10mm larger than the largest outer diameter of the glass tube, the metal joint, the elastic expansion joint and the metal ring.
The inner side (close to the glass tube) of the inner wall of the getter device and the outer side (in contact with the atmosphere) of the outer wall of the getter device are respectively polished by adopting mirror surfaces. For example, the inner wall polishing and the outer wall polishing stainless steel tubes which are concentric can be selected to form an annular cavity of the getter device, so that the focusing effect of the reflecting mirror on the end part of the heat collecting tube and the heat loss of the outer wall of the heat collecting tube can be more effectively reduced.
The getter is a non-evaporable getter having a shape including, but not limited to, a ring, a sheet, a ribbon, or a pellet.
The pigtail material includes, but is not limited to, stainless steel, copper, or kovar-glass tubing.
The sealing means of the tailpipe include, but are not limited to, brazing, press sealing ultrasonic welding, and glass sealing. For example, vacuum is applied while the seal is being pressed, followed by ultrasonic welding of the seal. Or brazing the blank plate with the same material by adopting silver-copper solder after vacuumizing.
The outer side of the tail pipe is hermetically connected with a protective cover made of the same material in a threaded connection mode, a welding mode or an adhesive mode.
Compared with the prior art, the heat collecting tube structure provided by the invention has the following characteristics:
(1) compared with the existing getter device arranged in the annular cavity of the heat collecting tube, the temperature is lower, and the getter can be in a proper temperature range (100-300 ℃) by utilizing mirror surface focusing and heat dissipation and heating of the outer tube of the glass tube.
(2) The external getter device is designed to ensure that powder falling off from the getter is not easy to enter the interlayer of the heat collecting tube, so that the heat collecting tube can be prevented from being damaged due to local overheating caused by the fact that the getter powder is accumulated at the bottom of the glass tube.
(3) The getter device wrapped outside the end part of the heat collecting tube has three functions of a light shield, a heat insulating layer and the getter device in the prior art, and simultaneously has a protection effect on the glass-metal sealing joint and the corrugated tube, so that the reliability of the heat collecting tube is improved.
(4) The getter device is connected with the outer tube of the heat collecting tube in a metal conduit welding mode, so that the strength and the reliability are higher; compared with the prior art, if the vacuum leakage treatment mode is found after exhaust, the heat collecting tube structure provided by the invention only needs to detach the getter device from the external getter device and the metal guide tube to replace and exhaust again, and the production cost is lower.
(5) Compared with the prior art that the glass tail connecting pipe is connected with the outer tube glass tube, the metal or kovar-glass exhaust tail connecting pipe is higher in reliability and lower in treatment cost when the glass or kovar-glass exhaust tail connecting pipe is damaged in the production process.
(6) The external getter devices are arranged at the two ends of the outer tube of the heat collecting tube and are connected with the tail connecting tubes, so that the two ends can be simultaneously vacuumized in the exhaust process, the vacuumizing efficiency is improved, and the production time and the energy consumption are shortened.
Drawings
Fig. 1 is a schematic structural view of the heat collecting tube of the present invention, wherein the left half of the figure is a schematic sectional view.
Fig. 2 is an exploded view of an external getter device in the heat collecting tube of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1, the heat collecting tube structure provided by the present invention includes a stainless steel tube 1 and a glass tube 2 which are coaxially disposed, the stainless steel tube 1 is used as an inner tube of the heat collecting tube, and the glass tube 2 is used as an outer tube of the heat collecting tube. Two ends of the glass tube 2 are symmetrically connected with the coaxial kovar rings 3 through glass-metal sealing along the axial direction. The outer end of the kovar ring 3 is connected with the stainless steel joint 4 through welding. A corrugated pipe 5 is used as an elastic expansion joint, and the corrugated pipe 5 is welded with the outer end of a stainless steel joint 4. The outer side of the stainless steel ring 6 is welded with the corrugated pipe 5, the inner side of the stainless steel ring 6 is welded with the stainless steel pipe 1, so that a closed chamber is formed between the stainless steel pipe 1 and the glass pipe 2, and the stainless steel joint 4 is provided with a guide pipe 15 communicated with the chamber in the radial direction.
The getter device 7 is coaxially arranged outside the glass tube and is located in a position covering the kovar ring 3, the stainless steel nipple 4, the bellows 5 and the stainless steel ring 6. As shown in fig. 2, the getter device 7 has an annular cavity formed by an inner wall 13 and an outer wall 12, one end of the annular cavity is closed, the other end of the annular cavity is provided with a seal head 11, the tail end of the seal head 11 is provided with a snap ring 14, and the getter sheets 9 are arranged in the annular cavity and limited by the snap ring 14; the getter device 7 has holes in the inner wall 13 and in the outer wall 12, respectively, in corresponding positions, the holes in the inner wall being connected by welding to the conduits of the metal fittings, and the holes 16 in the outer wall being connected to the copper pigtails 8. The outside of the tail pipe 8 is sealed and protected by a protective cover 17.
When the getter device 7 is assembled, the getter sheets 9 are firstly arranged in the annular cavity and limited by the snap ring 14 at the tail end of the seal head 11. The end closure 11 is inserted into the annular chamber and welded to seal the getter device 7 except for the holes in the inner and outer walls. The conduit 15 on the stainless steel fitting 4 is connected by welding to the hole on the inner wall 13 of the getter device 7. The hole 16 on the outer wall 12 of the external getter device 7 is welded with the copper tail pipe 8.
The two ends of the getter device 7 respectively cover the sealing position of the kovar ring 3 and the glass tube 2 and the welding position of the corrugated tube 5 and the stainless steel ring 6. The inner diameter of the inner wall 13 should be 3-10mm larger than the largest outer diameter of the glass tube 2, the kovar ring 3, the stainless steel joint 4, the corrugated tube 5 and the stainless steel ring 6. The excessively small inner diameter can cause the expansion of the glass tube 2 and the extrusion and damage of the outer wall 12 of the getter device when the heat collecting tube is heated, and the excessively large inner diameter can reduce the heat insulation effect of the getter device on the heat collecting tube. The outer side (the side in contact with the atmosphere) of the outer wall 12 and the inner side (the side facing the glass tube 2) of the inner wall 13 are polished to reduce the heating effect of the mirror line focus on the getter device and the radiant heat loss at the tip of the glass tube 2. An evaporable getter can be connected inside the stainless steel joint 4 or the bellows 5 to serve as a vacuum indicator.
According to the activation temperature of the non-evaporable getter, the activation of the getter can be synchronously heated and activated in the exhaust process, and can also be heated and activated after the tube is sealed.
If the getters are heated and activated synchronously in the exhaust process, the heat collecting pipes are vacuumized from the copper tail pipes at the two ends simultaneously during exhaust, the non-evaporable getters are activated simultaneously during exhaust in an external heating mode, the tail sections of the copper tail pipes are pressed when exhaust and pipe braking are completed, sealing is carried out through ultrasonic welding, and then the copper tail pipes are sealed through the protective covers 17 with the matching threads at the roots of the tail pipes 8. And activating the evaporable getter by adopting a high-frequency heating mode to form a silver mirror at the tail end of the glass tube.
After the heat collecting pipe structure provided by the invention is adopted to find that the evaporable getter indicator fails, the protective cover 17 is taken down, the tail end of the tail connecting pipe 8 is cut open, and a helium mass spectrometer leak detector is connected to perform leak detection on the heat collecting pipe. After a leak is found, if the leak is located at any one of the stainless steel tube 1, the glass tube 2, the kovar ring 3, the stainless steel joint 4, the corrugated tube 5 and the stainless steel ring 6, the tail connecting tube 8 and the getter device 7 are sequentially taken down after repair welding leak detection, the getter device 7 and the tail connecting tube 8 are reconnected, and exhaust and tube braking are performed after leak detection. Finally, the standby evaporable getter indicator is activated.
In contrast, in the prior art, the stainless steel inner tube, the kovar ring and the corrugated tube can only be taken down for reprocessing and recycling, and the processing cost is far higher than that of the heat collecting tube structure provided by the invention.
Claims (10)
1. A solar heat collecting tube structure with an external getter device is characterized by comprising a stainless steel tube, a glass tube and the getter device which are coaxially arranged, wherein the stainless steel tube is used as an inner tube of the heat collecting tube, and the glass tube is used as an outer tube of the heat collecting tube;
two ends of the glass tube are respectively connected with the metal joint in a sealing mode along the axial direction, the other end of the metal joint is welded with the elastic expansion joint, the other end of the elastic expansion joint is welded with the metal ring, the other end of the metal ring is welded with the stainless steel tube, so that a cavity is formed between the stainless steel tube and the glass tube, and a guide tube communicated with the cavity is arranged on the metal joint in the radial direction;
the getter device is coaxially arranged on the outer side of the glass tube and is positioned at a position covering the metal joint, the elastic expansion joint and the metal ring, the getter device is provided with an annular cavity formed by an inner wall and an outer wall, one end of the annular cavity is closed, the other end of the annular cavity is provided with an end socket, the tail end of the end socket is provided with a clamping ring, and the getter is arranged in the annular cavity and is limited by the clamping ring at the tail end of the end socket; the inner wall and the outer wall of the getter device are respectively provided with a hole at the corresponding position, the hole on the inner wall is connected with a conduit on the metal joint through welding, and the hole on the outer wall is connected with a tail connecting pipe.
2. The solar heat collecting tube structure as claimed in claim 1, wherein the stainless steel tube is coated with a heat absorbing coating on the outer wall, and the glass tube is coated with antireflection films on the inner and outer walls.
3. The solar heat collecting tube structure as claimed in claim 1, wherein the metal joint is made of kovar alloy with linear expansion coefficient matched with that of glass or unmatched stainless steel, or a welded combination of the kovar alloy and the stainless steel.
4. The solar heat collection tube structure of claim 1, wherein a bellows is used as the elastic expansion joint.
5. The solar heat collecting tube structure as claimed in claim 1, wherein the inner diameter of the inner wall of the getter device is 3-10mm larger than the largest outer diameter of the glass tube, the metal joint, the elastic expansion joint and the metal ring.
6. The solar heat collecting tube structure as claimed in claim 1, wherein the inner side of the inner wall and the outer side of the outer wall of the getter device are respectively mirror-polished.
7. The solar heat collection tube structure of claim 1, wherein the getter is a non-evaporable getter in the shape of a ring, a sheet, a ribbon, or a pellet.
8. The solar heat collection tube structure of claim 1, wherein the tailpipe material is stainless steel, copper or kovar-glass tube.
9. The solar heat collecting tube structure as claimed in claim 1, wherein the sealing manner of the tail pipe is soldering, press sealing ultrasonic welding or glass sealing.
10. The solar heat collecting pipe structure as claimed in claim 1, wherein the outer side of the tail connecting pipe is hermetically connected with a protective cover made of the same material in a threaded connection mode, a welding mode or an adhesive mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711389471.6A CN109945509B (en) | 2017-12-20 | 2017-12-20 | Solar heat collecting pipe structure with external getter device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711389471.6A CN109945509B (en) | 2017-12-20 | 2017-12-20 | Solar heat collecting pipe structure with external getter device |
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| Publication Number | Publication Date |
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| CN109945509A CN109945509A (en) | 2019-06-28 |
| CN109945509B true CN109945509B (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711389471.6A Active CN109945509B (en) | 2017-12-20 | 2017-12-20 | Solar heat collecting pipe structure with external getter device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1720419A (en) * | 2003-01-09 | 2006-01-11 | 索莱尔太阳能***有限公司 | Getter support assembly for a solar energy collector system |
| CN1862143A (en) * | 2005-05-09 | 2006-11-15 | 肖特股份有限公司 | Straw |
| CN201892341U (en) * | 2009-11-27 | 2011-07-06 | 康雪慧 | Solar-powered heat collecting pipe |
| CN202008244U (en) * | 2010-02-09 | 2011-10-12 | 康雪慧 | Heat collecting tube |
| JP2015014444A (en) * | 2013-07-08 | 2015-01-22 | 株式会社豊田自動織機 | Heat collection pipe |
| CN105588351A (en) * | 2015-12-30 | 2016-05-18 | 南京诚远太阳能科技有限公司 | Solar thermal collecting pipe and processing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100126499A1 (en) * | 2008-11-24 | 2010-05-27 | Wei David Lu | Solar Thermal Energy Absorber Tube |
-
2017
- 2017-12-20 CN CN201711389471.6A patent/CN109945509B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1720419A (en) * | 2003-01-09 | 2006-01-11 | 索莱尔太阳能***有限公司 | Getter support assembly for a solar energy collector system |
| CN1862143A (en) * | 2005-05-09 | 2006-11-15 | 肖特股份有限公司 | Straw |
| CN201892341U (en) * | 2009-11-27 | 2011-07-06 | 康雪慧 | Solar-powered heat collecting pipe |
| CN202008244U (en) * | 2010-02-09 | 2011-10-12 | 康雪慧 | Heat collecting tube |
| JP2015014444A (en) * | 2013-07-08 | 2015-01-22 | 株式会社豊田自動織機 | Heat collection pipe |
| CN105588351A (en) * | 2015-12-30 | 2016-05-18 | 南京诚远太阳能科技有限公司 | Solar thermal collecting pipe and processing method thereof |
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| CN109945509A (en) | 2019-06-28 |
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Effective date of registration: 20190703 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Applicant after: Research Institute of engineering and Technology Co., Ltd. Address before: No. 2, Xinjie street, Xicheng District, Beijing, Beijing Applicant before: General Research Institute for Nonferrous Metals |
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