Concentrating vacuum tube and high-concentrating-ratio trough-type heat collecting device

Abstract

The invention discloses a concentrating vacuum tube and a high-concentrating-ratio trough-type heat collecting device and belongs to the field of solar heat collecting device. By means of the concentrating vacuum tube and the high-concentrating-ratio trough-type heat collecting device, the problem that a traditional trough-type heat collecting device is low heat fetching temperature due to the lowconcentrating ratio is solved. According to the concentrating vacuum tube comprises, an arc reflecting plate is installed on a tube joint so as not to make contact with the inner wall of a glass casing tube, so that the situation that the arc reflecting plate causes damage to the glass casing pipe due to overhigh temperature rise in the concentrating process is avoided, accordingly a heat collecting tube can effectively bear irradiation of light rays having a certain concentrating ratio after primary concentrating, and performs secondary reflection concentrating on the light rays, and finallythe purpose of a high concentrating ratio is achieved. The trough-type heat collecting device can effectively achieve the purpose of the high concentrating ratio by adoption of the concentrating vacuum tube and through successive primary reflection concentrating and secondary reflection concentrating on sunlight. Generally, the concentrating ratio can be up to 300-1000 times.

Description

technical field [0001] The invention relates to the field of solar heat collecting devices, in particular to a concentrating vacuum tube for solar heat collecting and a trough heat collecting device with a high concentration ratio. Background technique [0002] At present, mature solar thermal power generation has three types of heat collectors: trough type, tower type and dish type (disc type), but none of them are suitable for commercial operation due to high cost. Among them, there are mainly two forms with development prospects: trough type and tower type. That is, the trough type and the tower type may meet the conditions for commercial operation through technological breakthroughs. [0003] The advantages of the tower heat collector are: high concentration ratio, generally up to 200-1000 times the concentration ratio, so that the heat extraction temperature is high, generally up to 700-1200°C, and can use low-cost lava heat storage system and High-efficiency generato...

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Problems solved by technology

[0005] The technical problem solved by the present invention is: the traditional trough-type heat collecting device has low concentration ratio, which leads to low heat extraction temperature of the trough-type heat collecting device; it is proposed to provide a heat-collecting vacuum tube that can withstand high light concentration The high concentration ratio trough heat collector composed of this

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