The quality-based utilization technology of low rank coal has attracted much attention due to its advantages in energy saving and emission reduction. A novel triple-bed combined circulating fluidized bed (TBCFB) system

which includes a pyrolyzer

a gasifier and a combustor

is developed to minimize energy loss. A new process was proposed to used char coal particles instead of sand particles as heat-carried circulating medium and an Aspen Plus process simulation was established to obtain optimum operating conditions for material conversion and energy utilization between three bed reactors. The results showed that 40% char coal combustion could provide enough energy for both low rank coal pyrolysis at 600℃ and gasification of water over 60% residual char coal at 800.9℃. High heat capacity char coal particles significantly reduced amount of heat-carried particles needed to circulate in the system. To meet the requirements of heat transportation

mass ratio of char coal to low rank coal was 5.5

whereas mass ratio of quartz and ash to low rank coal were 11 and 12

respectively. Comprehensive analysis of syngas composition

cold gasification efficiency (CGE) and lower heating value (LHV) indicated optimal ratio of steam to char coal (St/C) was 1.5 in gasification. The simulation results would provide some guidance on industrial application of TBCFB system with char coal as heat-carried particles.