Optical ct measurement and mathematical prediction of multi-temperature in pulverized coal combustion field

Abstract

Temperature distributions of particles and gas in the pulverized coal combustion furnace were measured by a newly developed CT (computer tomographic) technique in which the particle temperature was measured by an instantaneous two color pyrometry and the gas temperature by a wing zone Na-D line reversal method. A simplified mathematical model was formulated for a one-dimensional pulverized coal combustion field with the radiative heat transfer processes of scattering, absorbing and emitting. The model calculations predicted that the particle temperature was more than 400 K higher than the gas temperature, especially in the region of volatile matter combustion. This result explained the phenomena actually observed by the optical measurements well.