Low-temperature annealing process for reducing stress of glass-metal connection sealing structure

A technology of metal sealing and structural stress, which is applied to solar collectors using working fluids, components that conduct solar radiation and prevent heat radiation from flowing out, lighting and heating equipment, etc., and can solve the problem of glass breakage and accelerated Problems such as film aging attenuation, birefringent optical path difference, etc., to achieve the effect of improving safety reliability, increasing effective life, and reducing annealing temperature

Inactive Publication Date: 2020-04-21
北京天瑞星光热技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The medium-high temperature solar collector tube is mainly composed of a glass outer tube with an anti-reflection coating and a metal inner tube with a solar selective absorption coating. The reliability affects the normal operation of the power station to a large extent. The weakest part of the heat collector is the glass-metal seal used to connect the glass outer tube and the metal inner tube. Due to the essential difference in the physical properties of glass and metal, The two cannot achieve complete agreement in terms of linear expansion, so a certain structural stress will inevitably be generated during the sealing process. The existence of structural stress is a very big hidden danger for the heat collector. Once the stress exceeds a certain Released under a special situation, cracks will occur at the sealing part, and it will be directly damaged if the sealing part is damaged. Once the sealing part is damaged, the vacuum built by the glass outer tube and the metal inner tube will disappear, thus making the solar energy selective. The absorbing coating is directly exposed to the air. This high-temperature oxidation environment will accelerate the aging and attenuation of the film layer. In addition, due to the absence of the protection of the vacuum environment, the metal inner tube will also lose a large amount of

Method used

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  • Low-temperature annealing process for reducing stress of glass-metal connection sealing structure

Examples

Experimental program
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Effect test

Example Embodiment

[0025] Example 1

[0026] A low-temperature annealing process for reducing the stress of the glass-metal sealing structure includes the following steps:

[0027] Step 1: Put the sealed glass-metal sealing section into the annealing furnace. The inner diameter of the glass outer tube at the glass-metal sealing section is φ125 and the wall thickness is 3mm (the same below);

[0028] Step 2: Raise the temperature in the annealing furnace from room temperature to 200°C, with a heating rate of 5°C / min, and keep it at 200°C for 30 minutes;

[0029] Step 3: Increase the temperature in the annealing furnace from 200°C to 350°C, with a heating rate of 3°C / min, and keep it at 350°C for 40 minutes;

[0030] Step 4: Increase the temperature in the annealing furnace from 350°C to 450°C, with a heating rate of 3°C / min, and keep it at 350°C for 40 minutes;

[0031] Step 5: Raise the temperature in the annealing furnace from 450°C to 520°C, with a heating rate of 3°C / min, and keep it at 520°C for 70 min...

Example Embodiment

[0037] Example 2

[0038] A low-temperature annealing process for reducing the stress of the glass-metal sealing structure includes the following steps:

[0039] Step 1: Put the sealed glass-metal sealing section into the annealing furnace;

[0040] Step 2: Raise the temperature in the annealing furnace from room temperature to 200°C, the heating rate is 7.5°C / min, and keep it at 200°C for 20 minutes;

[0041] Step 3: Increase the temperature in the annealing furnace from 200°C to 350°C, with a heating rate of 5°C / min, and keep it at 350°C for 40 minutes;

[0042] Step 4: Increase the temperature in the annealing furnace from 350°C to 450°C, with a heating rate of 5°C / min, and keep it at 350°C for 40 minutes;

[0043] Step 5: Raise the temperature in the annealing furnace from 450°C to 520°C, with a heating rate of 5°C / min, and keep the temperature at 520°C for 70 minutes;

[0044] Step 6: Reduce the temperature in the annealing furnace from 520°C to 470°C, with a cooling rate of 5°C / min,...

Example Embodiment

[0049] Example 3

[0050] A low-temperature annealing process for reducing the stress of the glass-metal sealing structure includes the following steps:

[0051] Step 1: Put the sealed glass-metal sealing section into the annealing furnace;

[0052] Step 2: Raise the temperature in the annealing furnace from room temperature to 200°C, with a heating rate of 10°C / min, and keep it at 200°C for 20 minutes;

[0053] Step 3: Raise the temperature in the annealing furnace from 200°C to 350°C, with a heating rate of 8°C / min, and keep it at 350°C for 40 minutes;

[0054] Step 4: Increase the temperature in the annealing furnace from 350°C to 450°C, with a heating rate of 8°C / min, and keep it at 350°C for 40 minutes;

[0055] Step 5: Raise the temperature in the annealing furnace from 450°C to 520°C, with a heating rate of 6°C / min, and keep the temperature at 520°C for 70 minutes;

[0056] Step 6: Reduce the temperature in the annealing furnace from 520°C to 470°C, with a cooling rate of 6°C / min, ...

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Abstract

The invention discloses a low-temperature annealing process for reducing stress of a glass-metal connection sealing structure. The low-temperature annealing process comprises the following steps: 1, putting a connected and sealed glass-metal connection sealing section into an annealing furnace; 2, increasing the temperature to 200 DEG C from the room temperature; 3, increasing the temperature to 350 DEG C from 200 DEG C; 4, increasing the temperature to 450 DEG C from 350 DEG C; 5, increasing the temperature to 520 DEG C from 450 DEG C; 6, reducing the temperature to 470 DEG C from 520 DEG C;7, reducing the temperature to 370 DEG C from 470 DEG C; 8, reducing the temperature to 300 DEG C from 370 DEG C; and 9, reducing the temperature to the room temperature from 300 DEG C. According to the invention, the glass metal connection sealing part is subjected to annealing treatment at the temperature below the glass strain point, so that the stress value of the connection sealing part is greatly reduced, the safety and the reliability of the connection sealing part are improved, the qualification rate of the product is improved, and the effective life of the whole product is prolonged.

Description

technical field [0001] The invention relates to the technical field of annealing technology for a glass-metal sealing structure of a heat collecting tube, in particular to a low-temperature annealing process for reducing the stress of a glass-metal sealing structure. Background technique [0002] The medium-high temperature solar collector tube is mainly composed of a glass outer tube with an anti-reflection coating and a metal inner tube with a solar selective absorption coating. The reliability affects the normal operation of the power station to a large extent. The weakest part of the heat collector is the glass-metal seal used to connect the glass outer tube and the metal inner tube. Due to the essential difference in the physical properties of glass and metal, The two cannot achieve complete agreement in terms of linear expansion, so a certain structural stress will inevitably be generated during the sealing process. The existence of structural stress is a very big hidd...

Claims

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Application Information

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IPC IPC(8): C03C27/00F24S10/70F24S70/225F24S70/25F24S80/58
CPCC03C27/00F24S10/70F24S70/225F24S70/25F24S80/58Y02E10/44
Inventor 王鑫安德吉张磊曹明刚曲东辉金作林焦新宇
Owner 北京天瑞星光热技术有限公司
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