Solar power generation high-temperature vacuum heat collection tube with built-in expansion joint

Abstract

The invention discloses a solar power generation high-temperature vacuum heat collection tube with a built-in expansion joint. A heat conduction tube and a shielding cover are welded together; the shielding cover and an inner hole of a lower cover board are welded together; one end of the expansion joint and the lower cover board are directly welded, and the other end of the expansion joint and an inner hole of an upper cover board are welded together; a glass metal encapsulation shell is welded at the outer circle of the upper cover board; an inner hole of the expansion joint and the outer circle of a guide ring are welded together; and an arc welding ring is welded on the outer surface of the expansion joint. The solar power generation high-temperature vacuum heat collection tube with the built-in expansion joint has the advantages of high heat absorption efficiency, high integrated efficiency, long service life and high axiality.

Description

technical field [0001] The invention belongs to the technical field of solar photothermal power generation, and relates to a solar power generation high-temperature vacuum heat collecting tube with built-in expansion joints. 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 to red...

AI Technical Summary

Problems solved by technology

[0005] 1. The original setting of the expansion joint reduces the effective length of the heat-absorbing tube and affects the heat absorption efficiency of the tube

[0006] 2. The expansion joint is made of metal material and is connected with the inner and outer pipes. The original structure is easy to conduct and dissipate the heat absorbed by the inner pipe, which affects the overall efficiency of the heat collecting pipe.

[0007] 3. The welding structure of the expansion joint and the inner and outer pipes directly determines the welding quality, and plays a key role in the air tightness of the heat collecting tube, thereby affecting the heat absorption efficiency and service life of the heat collecting tube

[0008] 4. The connection structure between the original expansion joint structure and the inner and outer pipes is affected by the straightness of the inner and outer pipes of the 4-meter-long heat collection pipe, and at the same time affects the coaxiality of the heat collection pipe

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