Vacuum high-temperature solar heat collecting tube

Abstract

The invention belongs to the technical field of solar energy photo-thermal utilization and particularly relates to a vacuum high-temperature solar heat collecting tube which comprises a base tube, Kovar alloy, a glass cover and a bellows. The vacuum high-temperature solar heat collecting tube is characterized in that the outer wall of the base tube is sequentially provided with an absorbing coating and a reflection-deducting coating from inside to outside; the base tube, the absorbing coating and the reflection-deducting coating are fixedly sleeved with the glass cover, and the absorbing coating and the reflection-deducting coating are located on the outer wall of the base tube; the glass cover is fixed to the two ends of the bellows through the Kovar alloy; the absorbing coating is made of a nickel and molybdenum ceramic composite material or a tungsten and cobalt ceramic composite material; the reflection-deducting coating is one or a combination of an aluminum oxide coating, a chromium oxide coating and a tin dioxide coating; the thickness of the absorbing coating is 10-25 microns, and the thickness of the reflection-deducting coating is 10-25 microns. Vacuum heat preservation is adopted by the vacuum high-temperature solar heat collecting tube, so that heat conduction loss and heat convection loss are reduced. The vacuum high-temperature solar heat collecting tube has the advantages of being resistant to high temperature, good in weather resistance and high in thermal absorptivity.

Description

technical field [0001] The invention belongs to the technical field of solar light and heat utilization, and in particular relates to a vacuum high-temperature solar heat collecting tube. Background technique [0002] The energy problem has always been a problem that plagues our country and the whole world. After years of collection and use, fossil energy has been gradually exhausted, and the ecological environment of the earth is also overwhelmed. Therefore, we urgently need to find new energy sources to replace fossil fuels. [0003] The concept of renewable energy came into being, which mainly refers to solar energy, wind energy, biomass energy and tidal energy, etc., and among them, solar energy is the main one. Solar energy has the advantages of large amount of resources, wide distribution range, clean and pollution-free, and reliable technology. Solar power generation technology has increasingly become the focus of the development of renewable energy technology in my ...

AI Technical Summary

Problems solved by technology

At present, the heat collecting tubes used in solar thermal power generation generally adopt glass-metal vacuum solar heat collecting tubes, which have the following disadvantages: the heat absorbing layer of the heat collecting tubes is not resistant to high temperature, the long-term operating temperature is only 400 °C, and the thermal radiation loss of the heat collecting tubes is high. Light-to-heat conversion efficiency is low

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