1992 Volume 18 Issue 5 Pages 643-651
An optical method to measure particle and gas temperatures simultaneously and separately was proposed in order to study a combustion mechanism in pulverized coal combustion fields. The particle temperature was measured by high-speed two-color thermometry. The gas temperature was measured by an Na-D line reversal method. The CT method was used to (computed tomography) estimate the cross-sectional tem-perature distributions along the pulverized coal combustion field. Attenuation of radiation by the particles along the optical path was taken into account in the temperature calculation. The applicability of this method was demonstrated by computer simulations for artificial temperature and particle concentration distributions.
The temperature distribution in the furnace was correctly obtained by the experimental projection data by means of the CT method. The experimentally obtained particle and gas temperature distributions showed that there existed a great difference between these two temperatures. In the volatile combustion region the particle temperature was higher than the gas temperature, and the fluctuation of particle temperature was also larger than that of gas temperature. In the char combustion region, on the other hand, the gas temperature became higher than the particle temperature.
