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High-temperature solar thermal-collecting tube and manufacturing process thereof

A technology of solar collector tube and manufacturing process, which is applied in the field of solar thermal utilization, can solve the problems of low sealing temperature and difficulty in meeting the requirements of vacuum and high temperature exhaust of the collector tube, and achieve the effect of prolonging the service life

Inactive Publication Date: 2008-03-05
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the method with low sealing temperature is difficult to meet the requirements of vacuum and high temperature exhaust of heat collecting tubes

Method used

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  • High-temperature solar thermal-collecting tube and manufacturing process thereof
  • High-temperature solar thermal-collecting tube and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] FIG. 1 shows the end of a heat collecting tube 1 in section. The heat collecting tube 1 includes a glass outer tube 2 and a metal inner tube 3 coaxially located in the glass outer tube 2. The metal inner tube 3 is made of stainless steel alloy, and its outer layer is coated with a high-temperature-resistant aluminum oxide cermet selective absorption coating.

[0044]The connecting piece 4 connects the metal inner tube 3 and the bellows 5 with expansion compensation; the connecting piece 9 welds the bellows 5 and the Kovar ring 6 together, and the thin-walled light-shielding ring 8 is also welded on the bellows 5, The inclination of the shading ring is calculated according to the law of reflection to ensure that it can not only block the light but also reflect the light to the metal tube as much as possible. The heat shield 7 is set on the Kovar ring to protect the seal from radiation.

[0045] Specific process flow:

[0046] In this embodiment, glass outer tube 2 sele...

Embodiment 2

[0057] Fig. 2 shows a partial sectional view of the heat collecting tube of the second embodiment in section.

[0058] In the present embodiment, glass outer tube 2 selects No. DM305 glass, and its coefficient of thermal expansion is 4.9×10 -6 K -1 , the diameter is 90-150mm, the wall thickness is 1.5-4mm; the Kovar ring is made of 4j30 alloy, and its thermal expansion coefficient is 4.8×10 -6 K -1 , with a diameter of 90-150 mm and a wall thickness of 0.5-1 mm; the structure of the heat collecting tube is basically similar to that of Embodiment 1, the difference is that the metal-glass transition piece Kovar ring 6 is directly inserted into the end of the glass tube body 2 for about 3-9 mm, In this way, a double-sided seal is formed, which ensures the seal strength and air leakage rate. In addition, the Kovar ring 6 is directly welded to the bellows 5 without using a connecting piece.

[0059] Specific process flow:

[0060] 1. With embodiment 1;

[0061] 2. Mechanicall...

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Abstract

A high temperature solar heat collecting tube and its producing technology mainly applies to tank type solar high temperature heat electric power generation field. The heat collecting tube includes external glass tube and coaxial metal internal tube, corrugated pipe with expansion compensation function is joined with the metal tube by connecting parts, the other end of the corrugated pipe is welded with metal-glass transition parts kovar ring, then the kovar ring is sealed-in with the glass tube, in order to protect glass and glass sealing-in part against radiation, a sunshade hood is mounted at the outer side of sealing-in part, a thin-wall lightproof ring is welded on the corrugated tube. The said glass tube is made of DM308; DM305 or DM320 molybdenum group glass, the kovar ring is made of 4j29 or 4j30 iron-nickel-cobalt low expansion alloy.

Description

technical field [0001] The invention relates to a high-temperature solar heat-collecting tube and a manufacturing process thereof, which are mainly used for vacuum heat-absorbing tubes of a trough-type solar thermal power generation system, and belong to the technical field of solar light and heat utilization. Background technique [0002] The trough solar thermal power generation system is a typical high-temperature solar energy utilization device. It uses a trough parabolic mirror that can track the sun to reflect and focus the incident sunlight on the vacuum tube, and the selective absorption film coated on the surface of the metal tube absorbs sunlight. Heating the working medium in the tube generates high-pressure steam to drive the steam turbine to generate electricity. In the early 1990s, the LUZ company established by the United States and Israel successively built nine trough solar thermal power plants in the California desert, with a total installed capacity of 353...

Claims

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Application Information

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IPC IPC(8): F24J2/24F24J2/05F24S10/70F24S10/40
CPCY02E10/44F24S10/45F24S40/00F24S40/80F24S70/225F24S80/70
Inventor 王志峰雷东强
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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