Solar heat absorption tube

Abstract

The invention discloses a solar heat absorption tube, which comprises a glass outer tube, a metal inner tube arranged in the glass outer tube and a corrugated tube, wherein a vacuum first annular space is formed between the glass outer tube and the metal inner tube; one end of the corrugated tube is connected with the metal inner tube through an end cover, and the other end of the corrugated tube is connected with a sealing metal ring through a connecting piece; the corrugated tube is in a pre-compressed state and is positioned on the outer side of the end part of the glass outer tube axially; getter devices are annually distributed in a second annular space formed between the sealing metal ring and the metal inner tube; and a light shielding ring is fixed on a connecting piece, and at least part of the light shielding ring extends axially to the first annular space for shielding the sealed part of the sealing metal ring and the glass outer tube. The solar heat absorption tube has the advantages of hydrogen absorbing capacity and convenience of manufacturing and has a high effective utilization rate and long service life.

Description

Technical field [0001] The invention belongs to the technical field of solar light and heat utilization, and particularly relates to a solar heat absorption tube applied to a trough-type solar heat collection system. Background technique [0002] The trough solar thermal power generation system is a solar thermal utilization system that uses a trough-shaped parabolic mirror that can track the sun to reflect and focus incident light on the heat absorbing tube. The selective absorption film coated on the surface of the metal inner tube absorbs the sun. The light heats the working fluid in the tube to produce high temperature and high pressure steam, which drives the steam turbine to generate electricity. The solar heat absorption tube is the most core component of the trough solar thermal power station. [0003] Chinese patent number ZL200610112005.9 discloses a high-temperature solar collector tube and its manufacturing process. The high-temperature solar collector tube includes a ...

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventor has found that the prior art has at least the following problems: the increase of hydrogen in the heat collecting tube will sharply increase the heat loss and reduce the heat absorption efficiency of the heat collecting tube

In addition, due to the thinner bellows and the large difference in wall thickness between the glass-to-metal transition piece, welding is more difficult, often causing welding damage or air leakage

The disadvantage of the getter support assembly is that the getter device is placed on the metal inner tube, and the temperature of the metal inner tube is above 400°C when the metal inner tube is working. The temperature of the getter will increase through heat transfer, and at the same time the getter is unavoidable will be exposed to spotlight, which will heat the getter

As the getter performance of the getter decreases significantly with the increase of temperature, the efficiency of the heat-absorbing tube decreases when it works at high temperature

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