Parabolic slot type solar heat collection device

Abstract

The invention discloses a parabolic slot type solar heat collection device, which is formed by a paraboloidal reflective mirror and a heat collection sleeve, wherein the heat collection sleeve is formed by an outer side combination tube wall and a middle part absorption tube; the middle part absorption tube is sleeved with the outer side combination tube wall; a selective coating is coated on the outer layer of the middle part absorption tube; heat-conducting media are arranged inside the middle part absorption tube; a heat-conducting medium, air, is between the outer side combination tube wall and the middle part absorption tube. According to the device, the problems of single heat-conducting medium and relatively lower heat collection temperature of the traditional slot type solar heat collection tube are solved; the cost of device investment, manufacturing and maintenance of the heat collection tube is lowered; the economy of slot type electric power generation is improved; uniform distribution of internal flow fields and temperature fields of the heat collection tube is facilitated; and heat stress is reduced. Therefore, the requirements of low cost and high power generation efficiency for the solar heat collection device are satisfied.

Description

technical field [0001] The invention relates to the technical field of solar heat collection and thermal power generation, in particular to a parabolic trough type solar heat collection device, which is a trough type solar heat collection device with secondary concentration and no vacuum between two tube walls. Background technique [0002] Solar thermal power generation technology is mainly based on the energy provided by concentrating heat collectors, which are mainly divided into three types: trough type, tower type and dish type. Relatively speaking, trough solar thermal power generation technology is relatively mature, and commercial power plants have already been in operation. The parabolic trough solar heat collection system is the core of the trough solar thermal power generation system. The heat collector tube is the core component of the heat collection system, and its performance directly affects the thermal performance of the entire heat collection system and the...

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Problems solved by technology

[0012] In view of this, the main purpose of the present invention is to provide a parabolic trough solar thermal collector to solve the problem of single heat transfer medium and relatively low heat collection temperature in traditional trough solar thermal collector tubes; Reduce manufacturing and maintenance costs, improve the economy of trough power generation; at the same time promote the uniform distribution of flow field and temperature field in the heat collector tube, and reduce thermal stress

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