Multi-scale experimental and autothermal simulation of bituminous coal and corn straw chemical looping co-gasification for cleaner production of syngas

Abstract

Herein, the process scale-up route of multi-scale coal and biomass chemical looping co-gasification (CLCG) is established using a thermogravimetric analyzer, a batch bubbling fluidized bed, and an MWth scale industrial demonstration unit. The positive synergistic effect is most notable at a bituminous coal blending ratio of 70%. Fuel synergy has a positive contribution to cold gas efficiency (CGE) and syngas yield (Ys), and the optimal CGE and Ys of the fluidized bed are 68.92% and 4.305 Nm3/kg, respectively. The direct scale-up of the fluidization mode can be adapted to the pilot unit, and the heat efficiency of autothermal CLCG system is 66.84%. This work achieves a process upgrade of CLCG from basic research to technological development to engineering demonstration.