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A preparation method of high-reflective heat-insulating coating at the end of high-temperature vacuum heat-collecting tube

A vacuum heat collecting tube and thermal insulation coating technology, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of heat collecting tube cracking and heat collecting tube cracking at the metal-glass seal, and reduce the Increased temperature, heat insulation effect, and low thermal conductivity effect

Active Publication Date: 2021-02-26
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problem in the prior art that the high-temperature vacuum heat-collecting tube is easily overheated at the metal-glass seal and the thermal stress causes the heat-collecting tube to rupture, the purpose of the present invention is to provide a high-temperature vacuum heat-collecting tube end with high reflection heat insulation The preparation method of the coating is to directly prepare a high-reflective heat-insulating coating on the metal-glass seal of the high-temperature vacuum heat collector tube, so as to avoid the local overheating of the metal-glass seal caused by direct sunlight and cause the heat collector tube to rupture

Method used

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  • A preparation method of high-reflective heat-insulating coating at the end of high-temperature vacuum heat-collecting tube

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]1. Use sandpaper to polish the Kovar surface with a roughness of 4μm, then wipe and clean with alcohol and blow dry;

[0021]2. Clean the surface of the glass to be sprayed with alcohol and blow dry;

[0022]3. Using atmospheric plasma spraying technology to prepare YSZ ceramic thermal insulation coating on the surface of Kovar and glass, the specific process parameters are: current 350A, voltage 50V, H2The flow rate is 30L / min, the Ar flow rate is 50L / min, the spraying speed is 5mm / s, the spraying distance is 120mm, and the coating thickness is 100μm.

[0023]4. Use the self-made thermal insulation test equipment to test its thermal insulation performance. The thermal insulation effect refers to the temperature difference between the upper and lower surfaces of the coating under steady-state heat conduction (that is, when the heat flow of the coating is fixed). Place thermocouples on the surface of the coating and in the substrate. Raise the furnace temperature to the set temperature ...

Embodiment 2

[0025]1. Use sandpaper to polish the Kovar surface with a roughness of 4μm, then wipe and clean with alcohol and blow dry;

[0026]2. Clean the surface of the glass to be sprayed with alcohol and blow dry;

[0027]3. Using atmospheric plasma spraying technology to prepare YSZ ceramic thermal insulation coating on the surface of Kovar and glass, the specific process parameters are: current 400A, voltage 50V, H2The flow rate is 30L / min, the Ar flow rate is 60L / min, the spraying speed is 5mm / s, the spraying distance is 120mm, and the coating thickness is 150μm.

[0028]4. Use the self-made thermal insulation test equipment to test its thermal insulation performance. The thermal insulation effect refers to the temperature difference between the upper and lower surfaces of the coating under steady-state heat conduction (that is, when the heat flow of the coating is fixed). Place thermocouples on the surface of the coating and in the substrate. Raise the furnace temperature to the set temperature ...

Embodiment 3

[0030]1. Use sandpaper to polish the Kovar surface with a roughness of 4μm, then wipe and clean with alcohol and blow dry;

[0031]2. Clean the surface of the glass to be sprayed with alcohol and blow dry;

[0032]3. Using atmospheric plasma spraying technology to prepare YSZ ceramic thermal insulation coating on the surface of Kovar and glass, the specific process parameters are: current 420A, voltage 60V, H2The flow rate is 30L / min, the Ar flow rate is 70L / min, the spraying speed is 5mm / s, the spraying distance is 120mm, and the coating thickness is 100μm.

[0033]4. Use the self-made thermal insulation test equipment to test its thermal insulation performance. The thermal insulation effect refers to the temperature difference between the upper and lower surfaces of the coating under steady-state heat conduction (that is, when the heat flow of the coating is fixed). Place thermocouples on the surface of the coating and in the substrate. Raise the furnace temperature to the set temperature ...

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Abstract

The invention discloses a method for preparing a high-reflection heat-insulating coating at the end of a high-temperature vacuum heat collecting tube, comprising the following steps: (1) polishing the surface of the kerf with sandpaper to a roughness lower than 5 μm, and then wiping and cleaning it with alcohol, Blow dry; (2) clean the glass surface to be sprayed with alcohol, and blow dry; (3) adopt atmospheric plasma spraying technology to prepare zirconia ceramic thermal insulation coating on the surface of Kovar and glass, and the specific process parameters are: the current is 300 ‑600A at 40‑80V, H 2 The flow rate of Ar is 10-50L / min, the flow rate of Ar is 40-100L / min, the spraying speed is 4-10mm / s, and the spraying distance is 100-200mm. The present invention adopts atmospheric plasma spraying technology to spray a layer of ceramic heat-insulating coating on the surface of Kovar and glass, which can effectively reduce the temperature at the junction of Kovar-glass, thereby achieving the purpose of protecting the heat collecting tube and effectively prolonging the service life of the heat collecting tube.

Description

Technical field[0001]The invention relates to a method for preparing a high-reflective heat-insulating coating on the end of a high-temperature vacuum heat-collecting tube.Background technique[0002]The trough-type solar thermal power generation system is called trough-type parabolic reflector solar thermal power generation system. It is a series and parallel arrangement of multiple trough-shaped parabolic concentrating heat collectors, and the solar energy is focused on the solar vacuum collector through the trough-shaped parabolic reflector. Above, the solar vacuum heat-collecting tube absorbs and transfers heat to the heat-conducting medium in the heat-collecting tube, and the heat-conducting medium transfers the heat to the working medium water to heat it into high-pressure and high-temperature steam, which is used to drive the turbine generator set to generate electricity. Among them, the solar high temperature vacuum collector tube is the core component of the system, and the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11
Inventor 于庆河米菁郝雷李世杰杜淼刘晓鹏蒋利军
Owner GRIMAT ENG INST CO LTD