Operation of a Pressurized CFB Gasification for Bituminous Coal

The effect of furnace pressure on bituminous coal gasification was studied on laboratory-scale pressurized circulating fluidized bed (CFB) gasifying furnaces. Within the scope of this paper this test facility as well as its operation behavior is described. Furthermore the parameter pressure has been investigated regarding to its influence on the producer gas composition, carbon conversion, carbon content of fly ash, yield of dry gas, efficiency of cold gas and low heat value (LHV) of coal gas are presented and discussed in the following. The study results showed that the gasification quality was improved at elevated pressure because of the better fluidization in the reactor. Coal gasification at a higher pressure shows advantages in LHV, and carbon conversion. The dry gas yield and efficiency of cold gas increased little with the increase of the furnace pressure. For a certain CFB coal gasification process, when the pressure is 0.3~0.4 MPa, this parameter had an optimum operating figure.