Thin film thermoelectric power generation coupling selective absorption coating method and its heat collection control method

Abstract

The invention provides a film temperature difference power generation coupled selective absorption coating layer preparation method and a heat collecting pipe preparation method thereof. The absorption coating layer preparation method comprises the following steps: a first insulation layer is formed on the outer wall of a metal pipe; a PN junction layer is formed on the outer wall of the first insulation layer; a second insulation layer is formed on the outer side of the PN junction layer; and a selective absorption coating layer is formed on the outer wall of the second insulation layer. Theheat collecting pipe preparation method comprises the steps of film plating of a steel pipe, pretreatment of cover glass, pretreatment of a small metal part, assembly of an assembly, vacuum exhausting, detection and packing. A film temperature difference power generation coupled selective absorption coating layer production line is perfectly fused into a traditional glass metal sealed solar heat collecting pipe production line; and a vacuum film plating device and a station for the PN coating layer and laser or plasma etching equipment only need to be properly added in vacuum film plating equipment adopted by a traditional selective absorption coating layer film plating process.

Description

technical field [0001] The invention relates to a coating structure of a solar heat collection tube, in particular to a glass-metal fusion-sealed straight-through solar heat collection tube structure utilizing thin-film thermoelectric power generation coupled with a selective absorption coating. Background technique [0002] Solar energy has the great advantages of being inexhaustible, inexhaustible, clean and environmentally friendly, and has been accepted by the society and developed rapidly. [0003] At present, there are two main ways to utilize solar energy: power generation and heat utilization. Power generation is divided into photovoltaic power generation and solar thermal power generation. Heat utilization mainly converts solar energy into heat energy to provide medium-temperature and low-temperature industrial or civil heat below 250°C. With the development of technology, there is a trend of technology coupling between photovoltaic and photothermal, that is, when...

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Problems solved by technology

[0006] 1. They are all based on the combination of the existing thermoelectric power generation sheet module and the low-temperature solar collector tube. The structure and process are complicated, and it is difficult to carry out large-scale production

[0007] 2. Due to the small temperature difference, the actual power generation efficiency is low, and there will be problems with poor additional input and output benefits and low economic benefits that cannot be accepted by the market

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