Solar heat-absorbing pipe

Abstract

The invention relates to a solar heat-absorbing pipe which comprises a glass outer pipe (2) and a metallic inner pipe (1) provided with a heat-resistant selective absorption coating, wherein one end of a corrugated pipe (4) with an expansion compensation function is welded with the metallic inner pipe (1) through a connecting piece (3), and the other end of the corrugated pipe (4) is connected with the glass outer pipe (2); a vacuum annular enclosure space (7) is formed between the glass outer pipe (2) and the metallic inner pipe (1); the corrugated pipe (4) is coaxially arranged together with the glass outer pipe (2) and the metallic inner pipe (1), one end of the corrugated pipe (4) is a straight drum section the port of which is a thin-wall knife edge, the outermost edge thickness of the straight drum section is less than 0.05mm, the conical degree of the knife edge is less than 3 degrees, or the thin-wall knife edge (6) is provided with a secondary skiving section (8) the conical degree of which less than 3 degrees, and the thin-wall knife edge is inserted into the pipe wall of the port of the glass outer pipe (2) so as to be sealed with the glass outer pipe (2) in a fusing manner.

Description

technical field [0001] The invention relates to a solar heat absorbing tube, which is mainly used in a heat collector of a trough solar thermal power generation system and belongs to the technical field of solar light and heat utilization. Background technique [0002] The trough solar thermal power generation system is a medium-high temperature solar thermal utilization system, which uses a trough parabolic mirror that can track the sun to reflect and focus the incident light on the heat-absorbing tube, and the selective absorption film coated on the surface of the metal inner tube Absorb sunlight to heat the working medium in the tube, generate high-temperature and high-pressure steam, and drive the steam turbine to generate electricity. From 1984 to 1990, LUZ Corporation of the United States successively built nine trough solar thermal power stations in the California desert, with a total installed capacity of 353MW, and the system is still in operation. [0003] The sol...

AI Technical Summary

Problems solved by technology

There are multiple welding seams in the heat collecting tube, and the process is relatively complicated. Once the welding causes damage to the glass and metal seal, the whole tube will be scrapped

Images