Solar high-temperature vacuum heat-collecting tube

Abstract

The invention relates to a high-temperature vacuum heat collection pipe for a trough type solar thermoelectric system, comprising a glass outside pipe and a metal inside pipe installed in the glass outside pipe. The glass outside pipe is connected with the metal inside pipe in a sealing way, and the interlayer of the glass outside pipe and the metal inside pipe is in a vacuum state. The high-temperature vacuum heat collection pipe is characterized in that a ceramic insulation ring is arranged between the end of the glass outside pipe and the end of the metal inside pipe. Both end surfaces of the ceramic insulation ring are covered by metallization layers or are respectively provided with an annular groove, the ceramic insulation ring is connected with the glass outside pipe in the sealing way through an alloy component which is connected on or fixedly inlaid in the metallization layer at one end, the other end of the ceramic insulation ring is connected with the metal inside pipe in the sealing way through a transition connecting disk or through the alloy component connected on or fixedly inlaid in the metallization layer and the transition connecting disk. Not only the ceramic insulation ring can eliminate a heat bridge between the glass outside pipe and the metal inside pipe to block heat exchange between the two pipes, and efficiently enhances the working efficiency of the heat collection pipe, but also the invention has simple structure and low manufacture cost, can overcome the manufacture bottleneck of the high-temperature vacuum heat collection pipe for the trough type solar thermoelectric system, and efficiently promotes the development of the solar thermoelectric technology and application thereof.

Description

technical field [0001] The invention belongs to the technical field of solar heat energy utilization devices, and relates to a vacuum heat collector for absorbing solar heat energy, in particular to a high-temperature vacuum heat collection tube used in a trough solar thermoelectric system. Background technique [0002] In solar thermal energy utilization technology, thermal power generation technology can significantly improve the utilization efficiency of solar thermal energy, especially trough solar thermal power generation device, which is considered to be the most practical technology in solar thermal power technology. The trough solar thermal power generation system uses a trough parabolic concentrator to gather sunlight and heat to the heat collecting element located on the focal line of the trough parabolic. The heat collecting element is generally a tubular heat absorber (heat collector) , the fluid working substance inside the tube, after being heated by the conver...

AI Technical Summary

Problems solved by technology

The vacuum annular heat insulation chamber can play a role of heat insulation transition to a certain extent, thereby reducing the temperature at the glass nozzle and improving the reliability of the high-temperature vacuum heat collection tube. However, since the vacuum annular heat insulation chamber is still made of metal, Therefore, on the one hand, the "thermal bridge" between the glass tube and the metal tube still exists;

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