| Experimental work was carried on a 17 kW, 600 cm long, gas fired laboratory combustor to investigate the post flame reactive capture of alkali species by kaolinite. Emphasis was on alkali/sorbent interactions occurring in flue gas at temperatures above the alkali dewpoint and on the formation of water insoluble reaction products. Time-temperature studies were carried out by injecting kaolinite at different axial points along the combustor. The effect of chlorine and sulfur on alkali capture was investigated by doping the flame with SO;An optimum temperature window between 900;A simple first order kinetic model is proposed for sodium capture by metakaolinite and is best fitted by volume rate k = 4.5 ;The capture reaction has been proposed to be between alkali hydroxide and activated kaolinite, and remains so in the presence of sulfur and chlorine. The presence of sulfur reduces sodium capture by under 10% at 1300... |
