Metal tube receiver used for groove type line-focusing solar heat collector

Abstract

The invention relates to a metal pipe receiver used for a groove-typed line focus solar heat collector. The structure of the metal pipe receiver is a glass sleeve which is made of tungsten glass, with openings at two ends. A glass-metal transition sealing part is made by the fusion welding of a molybdenum glass pipe and a Kovar alloy ring. A coaxial glass sleeve is arranged outside a central heatabsorbing metal pipe which is welded with an expansion joint which is welded with one end of the Kovar alloy ring of the glass-metal transition sealing part; the glass sleeve is jointed by fusion with one end of the molybdenum glass pipe of the glass-metal transition sealing part; a vacuum layer is formed between the central heat absorbing metal pipe and the glass sleeve. The metal pipe receiver used for a groove-typed line focus solar heat collector overcomes the defects of the prior art that the thermal expansion coefficients of the glass sleeve and the Kovar alloy are required to be matched strictly, thus leading to difficult manufacture, high cost, etc. Owning to the application of the glass sleeve which is made of tungsten glass and various connection types, the metal pipe receiver used for a groove-typed line focus solar heat collector has the advantages of low cost, long service life, etc.

Description

technical field [0001] The invention relates to a solar heat collecting device, in particular to a metal tube receiver for a trough-type line-focused solar heat collector, and belongs to the field of solar heat utilization. Background technique [0002] Trough line-focused solar collectors include compound parabolic collectors, parabolic trough collectors, etc. The convergence ratio is generally 1.5 to 80, and the working temperature range is 100°C to 500°C. The receiver converts the sunlight concentrated by the concentrator into heat energy, and is the core component of the trough solar collector. The reliability of the receiver determines the reliability of the trough solar collector; improving the thermal efficiency of the receiver is the key to improving the heat collection efficiency of the trough solar collector; the high cost of the trough solar collector restricts its large-scale promotion , Reducing receiver cost is an important way to reduce the cost of trough sol...

AI Technical Summary

Problems solved by technology

[0005] The glass-to-metal transition piece of the receiver in the above-mentioned patent is generally made of Kovar alloy, which is directly welded to the glass casing. High light transmittance needs to be made of special formula glass, the cost remains high, and the processing is also very difficult, which makes the receiver difficult to manufacture and the cost is high

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