In order to analyze the influence of co-combustion of biomass gas and coal on combustion process and operation performance of the boiler

the biomass gasification model and the syngas and coal co-firing model were established by Aspen plus.The co-firing process and emission characteristics of combustion products from mixtures of different coals with biomass gas from pine gasification with 20% moisture content were investigated.The change rules of the highest combustion temperature

the flue gas volume

flue gas temperature

boiler efficiency and combustion products were obtained under different co-firing conditions.The results show that

under conditions with constant total input heat of the boiler

when the co-firing ratio of the biomass gas increased from 0%to 30%

the highest combustion temperature decreased with the coal quality

while the exhaust temperature increased gradually.The exhaust volume rose continuously and reached its maximum value when the biomass gas' s co-firing ratio reahced 20%.The fly ash in flue gas decreased

the mechanical incomplete combustion heat loss reduced

and the boiler efficiency rose gradually.