Analysis of Emissions and Furnace Exit Gas Temperature for a Biomass Co-firing Coal Power Generation System

摘要

The effect of biomass co-firing on the furnace exit gas temperature and the gaseous emissions of CO_2, NO_x and SO_x is examined for a biomass co-firing based pulverized coal power generation system. We consider four biomass fuels (rice husk, sawdust, chicken litter and refused derived fuel) and two coals (bituminous coal and lignite). The results generated through simulation illustrate that increasing biomass proportion in the mixture decreases the furnace exit gas temperature for all fuel combinations. The net CO_2 emissions reduce significantly with increasing biomass for all types of selected biomass while there is an increase in gross CO_2 emissions for all blends except bituminous coal/refuse derived fuel, lignite/chicken litter and lignite/refuse derived fuel. The reductions in NO_x and SO_x emissions are dependent on the nitrogen and sulphur contents, respectively of the biomass fuel.