A semi-embedded 8-shaped cavity solar heat absorber and its working method

Abstract

The invention discloses a semi-embedding type eight-shaped cavity type solar receiver and a working method thereof. The solar receiver comprises a regular hexagonal convex mirror, a glass housing, a heat insulation vacuum layer, a steel inner shell, a soft heat transfer layer, a helical heat exchange coil tube, a heat conductive fluid, light reflection type wind shields and a cavity mouth convex mirror, wherein different from the traditional heat absorber, the solar receiver is in an eight shape, and independent feeding and discharge holes are formed in a low-temperature heating part and a high-temperature heating part and can be used for heating working media with different temperature requirements in a middle-high temperature solar heat utilization system and transporting the media with different temperatures respectively; the media can be secondarily heated by utilizing the focusing action of the regular hexagonal convex mirror; semi-embedding type connection between the soft heat transfer layer and the helical heat exchange coil tube makes the coil tube more uniformly heated, and thus heat spots are prevented from occurring; and through the focusing and closing actions of the cavity mouth convex mirror, the effects of efficiently absorbing heat and reducing convective heat loss can be reached.

Description

technical field [0001] The invention relates to a solar high-temperature heat absorber, in particular to a semi-embedded 8-shaped cavity-type solar heat absorber used in a single-plate or multi-plate solar high-temperature heat utilization system. Background technique [0002] Energy is an important basic resource for the survival and development of human society, and it is also an important guarantee for the economic security of all countries. Most currently rely on fossil fuels such as coal, oil and natural gas. According to statistics, the average annual growth rate of global primary energy consumption was 2.1% from 1971 to 2000, 3.9% from 2001 to 2004, and 4.5% from 2003 to 2004. It can be seen that the growth rate of primary energy consumption continues to increase. With the continuous consumption of primary energy, the CO on the earth 2 , SO 2 and NO x The rapid increase of emissions has brought great environmental pollution, and the development and full utilizatio...

AI Technical Summary

Problems solved by technology

[0006] The heat flux distribution of each heating surface of the existing cavity heat absorber is extremely uneven, and the solar radiation changes continuously with time

In addition, the state of the working fluid at the outlet of the evaporating heating surface of the cavity heat absorber is also extremely unstable, sometimes it is superheated steam, sometimes it is a steam-water mixture, and sometimes it is unsaturated water

At the same time, the uneven heat flow distribution will also cause the backflow and stagnation of the heat absorbing pipe, which may cause the downstream to fail to work normally or even be damaged.

Moreover, the existing cavity heat absorbers can only heat a single working fluid. For the downstream solar thermal utilization system that requires different temperature working fluids, this means that different types of cavity heat absorbers need to be installed, which not only makes the pipeline The installation is complicated, and the economic benefit will decrease accordingly

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