Ultra-supercritical tower type solar heat absorber

Abstract

An ultra-supercritical tower type solar heat absorber comprises a grating hot plate flow equalizing screen, a tube bank and a graphite filling layer. The grating hot plate flow equalizing screen is formed by splicing a plurality of grating hot plates (flat plate type heat pipes), each grating hot plate comprises a wick and a grating, and the grating hot plates are filled with phase change working media (such as sodium, potassium and lithium) and are vacuumized. Sunlight is reflected and gathered to the flow equalizing screen, the phase change working medium absorbs heat and evaporates on the evaporation surface of the grating hot plate, condenses on the condensation surface, and flows back to the liquid absorption core through grating condensation to form stable two-phase flow, so that efficient heat transfer is realized, the surface heat flow density is homogenized, and the surface temperature difference of the flow equalizing screen of the grating hot plate is greatly reduced; and thermal stress is reduced. And heat is transferred to the tube bundle embedded in the graphite through the graphite filling layer and is taken away by a heat transfer medium (water) in the tube bundle. By means of the heat absorber structure, water can be heated to be in an ultra-supercritical state, and operation parameters and power generation efficiency are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature heat utilization of solar energy, and in particular relates to an ultra-supercritical tower-type solar heat absorber. Background technique [0002] In recent years, my country has become the world's largest producer and consumer of energy, and the development of society is increasingly dependent on energy. However, traditional energy sources (fossil fuels, etc.) are non-renewable, and their reserves are limited in nature, and the environmental problems brought about by the consumption of traditional fossil fuels (such as the greenhouse effect, smog, etc.) are seriously threatening The harmonious and healthy development of nature and human society. Solar energy has attracted widespread attention due to its extensiveness, renewability, cleanliness, and high energy, and concentrated solar power generation technology is considered to be one of the technologies most likely to replace traditio...

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Problems solved by technology

The device has high light-to-heat conversion efficiency, high heat exchange efficiency, easy installation, can well withstand thermal load and thermal shock under high heat flux density, and can solve the problem of uneven heating of the heating surface of the existing flat-plate heat absorber and local overheating. Thermal fatigue, thermal ratchet and other problems caused by

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