Technical Study Of Syngas & Fusel Co-combustion In Syngas Fueled Gas Turbine

In methanol-electricity co-production system, coal-based syngas is used partially for electricity genneration in IGCC, and partially for methanol production. Due to the subsidiary reactions in methanol synthesis process, rectification is required and fusel waste is produced before fine methanol obtained. Aiming to solve the disposal problem of fusel waste, syngas-fusel co-combustion in syngas fueled gas turbine was proposed in this thesis.A series of studies were carried out and some results were obtained:Numerical studies on the performances of gas turbine cycle based on GateCycle software package were executed. It showed that, the performances of gas turbine would not change much when fusel-flowrate/syngas-flowrate ratio was below 0.03.Experimental studies on characteristics of syngas-fusel co-combustion flame were executed in a model combustor. It showed that, compared with syngas flame, syngas-fusel co-combustion flame was longer, and had less NOx emission and more CO emission. It could be predicted that when syngas-fusel co-combustion was introduced in syngas fueled gas turbine, flame length would be enhanced, NOx emission reduced but CO emission increased.The influences of fusel spray parameters on combustor performances were numerically studied using a full-size gas turbine combustor model. It showed that, the flow field and temperature distribution both had no obvious change since the amout of additional fusel was quite small. The cone angle of fusel spray was recommended to be between 60°～120°, while SMD was recommended to be below 60μm.Atomizers were designed for fusel atomization, spray characters of atomizers with different channel structures were experimentally studied, and proper atomizer structures were sought out.The present studies showed the feasibility of syngas-fusel co-combustion in syngas fueled gas turbine, and several possible influences on gas turbine performances and combustor performances caused by syngas-fusel co-combustion were pointed out, befitting spray parameters of fusel were recommended and proper atomizers were designed.