A medium-high temperature cavity type heat collecting tube used in a trough heat collecting system

Abstract

The invention discloses a medium-high temperature cavity type heat collecting tube used in a trough type heat collecting system, which comprises a circular metal cavity and a spiral metal absorption tube, wherein the circular metal cavity is not closed, leaving a certain gap as The light entrance is sealed by ultra-clear glass. The sun's rays are reflected by the concentrating parabolic mirror and enter the circular metal cavity through the light entrance. Part of the light is directly irradiated on the spiral metal absorption tube, and the rest of the light is reflected by the inner surface of the circular metal cavity for one or more times. Type metal absorber tubes are accepted. The invention is suitable for concentrating solar heat collection. The circular metal cavity has high strength, light weight and good overall rigidity. The spiral metal absorption tube can withstand high temperature and high pressure, and the spiral structure can accommodate longer in a limited space. Pipelines have better heat transfer effect than straight pipes.

Description

technical field [0001] The invention relates to a solar heat collection tube, in particular to a medium-high temperature cavity type heat collection tube in a trough heat collection system. Background technique [0002] As a kind of medium and high temperature heat collecting tube, the trough-type focused solar heat collecting tube can obtain a higher heat collecting temperature, and can be used in production and living fields such as power generation, refrigeration and air conditioning, heating, and seawater desalination. At present, the traditional trough-type solar heat collector mainly adopts metal-glass structure. Although the high-vacuum interlayer greatly reduces heat loss, there is also the problem of air leakage after long-term work due to the sealing of metal and glass, thereby reducing the overall trough. The working efficiency and system stability of the traditional solar system, and the heat collecting tube of this structure is complicated in process and high in...

AI Technical Summary

Problems solved by technology

At present, the traditional trough-type solar heat collector mainly adopts metal-glass structure. Although the high-vacuum interlayer greatly reduces heat loss, there is also the problem of air leakage after long-term work due to the sealing of metal and glass, thereby reducing the overall trough. The working efficiency and system stability of the traditional solar system, and the heat collecting tube with this structure is complex in process and high in cost

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