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Metal heat absorption tube and preparation method thereof

A technology of metal heat-absorbing tubes and metal tubes, which is applied in the field of solar energy utilization, can solve the problems of complex glass vacuum tube preparation process, glass outer tubes are easy to break, and thermal insulation performance decline, and achieve convenient processing, extended service life, and high heat absorption efficiency. high effect

Inactive Publication Date: 2009-05-06
LANZHOU UNIVERSITY
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AI Technical Summary

Problems solved by technology

If the heat collecting tube leaks, the vacuum degree will decrease, and the thermal insulation performance will decrease; moreover, the glass outer tube will be easily broken, which will bring a lot of inconvenience to the use and maintenance
In addition, the preparation process of the glass vacuum tube is complicated and the cost is high.

Method used

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  • Metal heat absorption tube and preparation method thereof

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Effect test

Embodiment Construction

[0015] (1) Formation of oxidation heat absorbing layer

[0016] A 6-meter-long ￠20cm stainless steel pipe (type 201 10cr17mn6ni5) is first cleaned, degreased, and dried, and then rapidly annealed at a high temperature of 700-800°C for 75-80s, so that the surface of the stainless steel metal pipe forms a blue oxidation absorption. thermal layer. Different annealing times can obtain different thicknesses of oxidized heat-absorbing layers. Due to the interference of the oxidized layer with different wavelengths of light, different colors are displayed. See the table below for details:

[0017] Table 1

[0018] Oxidation time (s) Coating color wavelength(nm) Thickness of corresponding endothermic oxide layer (nm) 70～75 light blue 430～450 899～937 75～82 blue 450～480 937～1000 82～90 blue green 480～500 1000～1041 90～96 green 500～560 1041～1167 96～102 yellow green 560～580 1167～1208 102～107 yellow 580～600 1208～1250 107～11...

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Abstract

The invention aims to provide a method for making a heat-absorbing pipe. The method comprises the following steps: a stainless steel metal pipe is cleaned, subjected to oil removal, dried and annealed at 700 to 800 DEG C for 70 to 85 seconds; a blue oxidative heat absorption layer is formed on the surface of the metal pipe; and an ultrasonic spray deposition process is adopted to treat the metal pipe so as to form a 100 to 200nm SnO2 antireflection coating on the surface of the metal pipe. The metal heat-absorbing pipe has the advantages of high heat-absorbing efficiency up to more than 90 percent, reflectivity of 0.03, stability at mediate and high temperature, no need of vacuum pumping, price which is one fifth of that of a vacuum pipe, and significance for reduction of cost of a solar system.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization, and relates to a metal heat absorbing tube and a preparation process thereof. Background technique [0002] Solar energy, as a clean, environmentally friendly and inexhaustible new energy, has been widely used in industrial and agricultural production and people's daily life. Solar heating technology is one of the most widely used technologies of solar energy. Solar heat absorbing tube is one of the key components in solar heating technology. The current solar collector tube is composed of a glass outer tube and a glass inner tube with a black coating on the outer wall. The two ends of the inner tube and the outer tube are fixedly welded, and the middle cavity is pumped into a vacuum cavity. The outer tube is transparent, sunlight penetrates the outer tube, is absorbed by the black coating on the outer wall of the inner tube, and transfers heat to the water in the inner tube, m...

Claims

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Application Information

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IPC IPC(8): C23C16/40
Inventor 谢二庆徐显波宋曦宋杰侯晨光
Owner LANZHOU UNIVERSITY
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