Two-stage parabolic type slot solar energy concentrating system provided with blackbody cavity with converging function

Abstract

The invention discloses a two-stage parabolic type slot solar energy concentrating system provided with a blackbody cavity with a converging function. The solar energy concentrating system mainly comprises two components, namely, a reflecting mirror and a hollow cavity type evacuated collector tube group, wherein the reflecting mirror comprises a main reflecting mirror and an auxiliary reflecting mirror; the main reflecting mirror and the auxiliary reflecting mirror are connected through a support, the main reflecting mirror is integrally formed, and converging surfaces of the main reflecting mirror and the auxiliary reflecting mirror are coated with a high reflectance coating; the hollow cavity type evacuated collector tube group consists of an artificial blackbody cavity casing provided with an entrance port, and a tubular heat absorber group; the artificial blackbody cavity casing is located between the main reflecting mirror and the auxiliary reflecting mirror; and a reflecting surface of the auxiliary reflecting mirror is an elliptical surface, an upper focus point of the elliptical surface is overlapped with a focus point of the main reflecting mirror, and a lower focus point of the elliptical surface is located in the central position of the artificial blackbody cavity casing. The two-stage parabolic type slot solar energy concentrating system overcomes the disadvantages that a one-stage parabolic type converging surface is low in strength, the processing technology is difficult, the mirror surface errors are large, the heat convection loss between an artificial blackbody cavity and the environment as well as between a tubular heat absorber and the environment is large, and the like.

Description

technical field [0001] The invention relates to the field of solar concentrating systems, in particular to a two-stage parabolic trough solar concentrating system with a converging function black body cavity. Background technique [0002] Solar energy resources have the advantages of being widely distributed, abundant, inexhaustible and inexhaustible. Although the total energy of solar radiation is huge, the energy flux density reaching the outer edge of the earth's atmosphere is low, only 1367W / m 2 about. Due to CO in the atmosphere 2 , Water vapor, dust and other particles absorption, attenuation and other effects, the energy flow density reaching the earth's surface is lower. Under the clear sky with a visibility of 22km, the solar radiation energy flux density on the earth's surface in mid-latitude regions is only 600-800W / m 2 . Since the energy flux density of solar energy resources is relatively low, it is necessary to increase the energy flux density through conc...

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Problems solved by technology

However, the primary parabolic trough converging surface in literature [1] is composed of two main reflectors separated by a certain distance. The actual production process will bring many problems, such as: the reduction of the strength of the first-level parabolic converging surface, the increase of the difficulty of th...

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