System and method for measuring spectral emissivity of high-temperature particle curtain

Abstract

The invention discloses a system and method for measuring spectral emissivity of a high-temperature particle curtain. The system comprises a Fourier infrared spectrometer, a blackbody radiation source, a reflector, a rotary table, a light path protection cover, a nitrogen cylinder, a particle curtain heating furnace, a two-color infrared thermometer and computers, wherein the Fourier infrared spectrometer is connected with the first computer; the blackbody radiation source is controlled by a digital PID controller; the particle curtain heating furnace is controlled by a temperature controller; the particles are placed in an inner container of the particle curtain heating furnace, after preheating is completed, the particles are released through a first high-temperature valve to form a particle curtain, the two-color infrared thermometer is used for measuring the temperature of the free falling body particle curtain, and the two-color infrared thermometer is connected with the second computer; and a particle curtain radiation signal and a black body radiation signal at the same temperature are measured by using the Fourier infrared spectrometer, and the spectral emissivity of the particle curtain is obtained by calculation. The method can be used for measuring the spectral emissivity of particle screens with different temperatures and thicknesses.

Description

technical field [0001] The invention relates to the technical field of tower-type concentrating solar thermal power generation, in particular to a measurement system for the spectral emissivity of a high-temperature particle curtain. Background technique [0002] Tower-type solar thermal power generation technology has the advantages of high concentration ratio and high power generation efficiency, and is one of the mainstream forms of large-scale solar thermal power generation. Its main principle is to use heliostats to gather sunlight to heat the heat transfer medium in the heat collector, convert solar energy into thermal energy, and then generate power through heat exchange and power cycle to convert thermal energy into electrical energy. In order to obtain a higher heat collection temperature and improve power generation efficiency, solar collectors have developed from liquid collectors using water and heat transfer oil as working fluids to molten salt collectors and so...

AI Technical Summary

Problems solved by technology

However, the state of the particles in the solid particle heat collector is a particle curtain with a certain gap between them. The high-temperature particles radiate each other and shield each other. The situation is complicated, and its radiation characteristics are very different from those in the accumulation state. Measurement of emissivity of high temperature particle curtains

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