High-temperature vacuum solar collector tube with outlaid expansion joint for solar power generation

Abstract

The invention discloses a high-temperature vacuum solar collector tube with an outlaid expansion joint for solar power generation. The high-temperature vacuum solar collector tube comprises a heat pipe, a transition plate welded with the outer surface of the heat pipe, and a shield barrel connected with the transition plate, wherein the shield barrel is arranged on the outer surface of the heat pipe; the inner side of the upper port of the expansion joint is welded with the transition plate; a cover plate is welded on the outer side of the upper port of the expansion joint; the lower port of the expansion joint is connected with a Kovar ring; and the Kovar ring is welded with a glass casing. The heat pipe is connected with the shield barrel through the transition plate to prevent the expansion joint from being affected directly by heat in the heat pipe so as to protect expansion joint. The expansion joint can be further protected, and the welding air-tightness between the expansion joint and the transition plate can be ensured by welding the inner side of the upper port of the expansion joint with the transition plate and welding the cover plate on the outer side of the upper port of the expansion joint. The lower port of the expansion joint is connected with the Kovar ring, and the Kovar ring is welded with the glass casing to form a closed vacuum space, thereby ensuring high thermal absorption efficiency, high overall efficiency and long service life.

Description

technical field [0001] The invention belongs to the technical field of solar photothermal power generation, and relates to a high-temperature vacuum heat collecting tube for solar power generation with an external expansion joint. Background technique [0002] Trough solar power generation is currently the most widely used solar thermal power generation technology for grid-connected power generation in the world. The core component of this technology is a high-temperature heat collector tube. The high-temperature heat collector tube heats the liquid working medium by absorbing solar energy, and then the high-temperature liquid working medium passes through the heat exchanger to generate high-pressure water vapor, which drives a conventional thermal power generation system to generate electricity. In order to improve energy conversion efficiency, in addition to the need for high-temperature collector tubes to heat the liquid working fluid to above 400°C, it is also necessary ...

AI Technical Summary

Problems solved by technology

However, the existing high-temperature solar vacuum heat collector tubes have poor heat absorption efficiency and low efficiency.

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