Chemical Looping Combustion Characteristics of Coal and Char in a Batch Type Fluidized Bed Reactor

Abstract

ABSTRACT Effects of temperature, volatile content, particle diameter and solid input weight were investigated in the batch fluidized bed reactor using OCN703-1100 particle as oxygen carrier and Roto coal and char as fuels. Two solid fuels represented the best reactivity at different temperature, 900℃ for Roto coal and 950℃ for char, respectively. However, we selected 900℃ as the best operating temperature because the improvement of reactivity of char at 950℃ was negligible. Char represented better reactivity than Roto coal because char contains low volatile than Roto coal. For both solid fuels, reactivities were improved with increasing of the particle diameter. These results were explained by solid mixing tests in a transparent fluidized bed using two char particles having different particle size ranges and OCN703-1100 particle. The bigger particle showed better solid mixing with OCN703-1100 particle, and therefore, represented better reactivity. For both solid fuels, reactivities were improved with increasing of the solid input weight within the experimental conditions of this study because the weight of coarse particles increased with the solid input weight increased, and therefore, these coarse particles can mix well with the oxygen carrier.KEY WORDS : Chemical-looping combustion(매체순환연소), Oxygen carrier particle(산소공여입자), Coal(석탄), Char(촤), Fluidized bed(유동층)