Linear Fresnel type high-temperature and high-pressure heat collecting tube

Abstract

The invention discloses a linear Fresnel type high-temperature and high-pressure heat collecting tube, and belongs to the technical field of photo-thermal power generation. The linear Fresnel type high-temperature and high-pressure heat collecting tube comprises an inner tube and an outer tube; the two ends of the inner tube and the two ends of the outer tube are fixedly connected through flanges; one side of the inner tube is fixedly connected with an inner tube special-shaped cavity; the two ends of the inner tube are provided with inner tube expansion joints; the inner tube is provided with a special-shaped cavity shrinkage opening; an outer tube expansion joint is arranged on the outer pipe; a heat dissipation plate is fixedly connected to the lower portion of the inner tube special-shaped cavity; heat dissipation fins are fixedly connected to the heat dissipation plate; and a long-strip-shaped installation opening is arranged at the lower portion of the outer tube in the axial direction and used for installing a glass sheet. The temperature change of the outer tube is small, and therefore the axial expansion amount of the outer tube is small, the relative displacement between the outer tube and the glass sheet is very small, so that the problem of defects caused by the defects of sealing rings of a glass tube and a stainless steel tube and different axial expansion amounts of the glass tube and the stainless steel tube in an existing glass vacuum heat collecting tube is solved, and the heat collecting tube can work under the conditions of higher temperature and higher pressure.

Description

technical field [0001] The invention belongs to the technical field of photothermal power generation, and in particular relates to a linear Fresnel type high temperature and high pressure heat collecting tube. Background technique [0002] The existing linear Fresnel molten salt type high-temperature heat collecting tube uses a stainless steel inner tube and a glass tube, and uses a high-temperature resistant material to seal the two ends of the space between the two tubes and then vacuumizes it, which is limited by the heat resistance and strength of the sealing material. , and the difference in radial and axial expansion coefficients between the stainless steel material and the glass material, the working temperature of the existing high-temperature heat collecting tube is only about 600°C, and the working pressure is only about 5-6MP, which greatly limits the meter of the heat collecting tube. power. When the research and development of molten salt or other working media...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the defects of the existing glass vacuum heat collecting tubes caused by the defects of the sealing rings of the glass tube and the stainless steel tube and the difference in the axial expansion of the glass tube and the stainless steel tube

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