18. Effect of Refractory Lining Thickness on Slag Layer Behavior in Cyclone Barrel

The cyclone-fired boiler has attracted much attention in recently yeares. The thickness of the refractory lining is closely related to the slag behavior which is of great importance for the operation of the cyclone-fired barrel. In this paper, the slag layer behavior in the cyclone barrel is investagated numerically when the refractory lining thickness is constant or varied. The results show that the refractory lining has a great effect on its surface temperature. Besides, the refractory lining should not be too thick to ensure the presence of the solid slag layer at the high temperature zone of the cyclone barrel. Therefore, in the cyclone barrel, the thickness of the refractory lining of the air inlets sections can be increased to reduce the heat dissipation, whereas the thickness of the refractory lining of the outlet section can be reduced to obtain a solid slag layer thick enough to prevent the erosion of the refractory lining. The proposed scheme with variable thickenss of the refractory lining is proved effective by the numerical simulation.