高温颗粒光谱发射率的测量

Spectral Emissivity Measurement of High-temperature Particles

聚光太阳能发电系统已经发展到以固体颗粒作为集热工质的第三代,作为吸收和储存热量的固体颗粒,其高温光谱发射率是一个十分重要的物性参数,在集热器的换热计算和效率评估等方面有着重要影响。本文基于光谱发射率测量方法中的能量法,利用傅里叶红外光谱仪(FTIR)和黑体炉等设备搭建的高温单颗粒光谱发射率测量系统,获得了3~5mm直径黄铜颗粒的高温光谱发射特性。

Concentrating solar power systems have developed to the third generation using solid particles as heat collectors.Solid particles absorb and store heat.Their high-temperature spectral emissivity is a significant physical property parameter for the heat transfer calculation and efficiency evaluation of collectors.In this study,based on the energy method for spectral emissivity measurement,a high-temperature single-particle spectral emissivity measurement system is built using Fourier-transform infrared spectroscopy(FTIR)and blackbody furnace,which can take into account the emissivity measurement of bulk materials simultaneously.High-temperature spectral emissivity data for 3~5 mm diameter brass particles were obtained based on the measurements with this test system.