A radial pin-fin structure solar heat absorber

Abstract

The invention discloses a solar heat absorber with a radial pin fin structure. The solar heat absorber comprises a heat insulation layer, a shell, a working medium inlet, a working medium outlet and a heat absorbing surface, wherein the working medium inlet and the working medium outlet are respectively arranged at the two ends of the shell; the heat insulation layer wraps the outer wall of the shell; a rectifying plate is arranged on the inner wall of the shell; the heat absorbing surface is arranged at a shell inlet; radial outer side pin fins matched with a sunlight gathering transmission route are expanded on the outer side of the heat absorbing surface; the density of outer side pin fins which are arranged from the center to the periphery of the heat absorbing surface is decreased; inner side pin fins are expanded on the inner side of the heat absorbing surface. The Gaussian distribution of solar flare energy flow density is fully considered, the radial pin fins with certain number are expanded on the two sides of the heat absorbing surface and are used for increasing heat-absorbing area, so that the temperature of the heat absorbing surface is reduced, and high-temperature burning of the heat absorbing surface is avoided; homogenizing of the temperature of the heat absorbing pin fins is facilitated, and the heat absorbing efficiency is improved.

Description

technical field [0001] The invention relates to a solar heat absorber, in particular to a solar heat absorber with a radial pin-fin structure. Background technique [0002] Solar energy is a renewable new energy source with abundant resources. The development and utilization of solar energy is very important for energy conservation, emission reduction and promotion of ecological civilization. The solar heat absorber converts the concentrated sunlight into a high-temperature heat source, heats the working medium to do work or drives a chemical reaction, and is a key component of the solar high-temperature heat conversion system. According to different functions that can be realized, there are many solar heat absorber schemes that have been proposed at present. For example, patent 201110233330.1 discloses a solar heat absorber with a convex cylindrical cavity at the bottom, and the bottom surface of the heat absorber shell has a V-shaped structure; The solar heat absorber i...

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Problems solved by technology

[0003] The design of the above solar heat absorber is focused on the internal geometric structure of the heat absorber cavity, and the characteristics of the Gaussian distribution of the concentrated solar energy flow density are not fully considered, resulting in an extremely high temperature of the heat absorbing surface in the central area of ​​the solar spot, which is easily oxidized and burned, and has poor reliability.

The research results show that the heat flux density in the center of the focused spot is as high as tens of megawatts per square meter. If a flat or curved surface is used to absorb heat, commonly used high-temperature resistant materials such as stainless steel and silicon carbide ceramics are easily burned and eroded

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