1-1-1 Design of Triple Bed Circulating Fluidised Bed Gasifier Model with Cold Gas Efficiency over 80%

Abstract

Increasing cold gas efficiency (CGE) of low-temperature gasification considering the configuration of triple-bed combined circulating fluidized bed (TBCFB) gasifier that involves steam gasification is critically important to reduce CO2 emission from power plants. In this study, the TBCFB gasification process was simulated with a commercial process simulator Aspen Plus®. From heat balance calculation between pyrolyser and gasifier (endothermic reactions), and riser (exothermic reaction) and regenerated steam from steam turbines injected into the gasifier, we found that maximum achievable CGE is 95.7% when char conversion ratio in the gasifier is 37.44% at 800 °C.