Performance and Emission Characteristic of Co-firing of Wood Pellets with sub-Bituminous Coal in a 330 MWe Pulverized Coal Boiler

A co-firing test of wood pellets with the subbituminous coal was carried out in a pulverized coal (PC) boiler with 330 MWe capacity to evaluate the effects on its performance and emission characteristics. Co-firing was done directly into the furnace. Wood pellets were fed manually on the conveyor after transfer tower-1. The ratio of fuel mix flow attained by setting the fuel flow in the coal feeders. Three different flow ratio percentages (1%, 31%, 51% of wood pellets) set up through the coal feeder. The study showed that co-firing wood pellets with a ratio of up to 51% in the PC boiler contributed to decreasing furnace exit gas temperature by 29.4 °C. Furthermore, the specific fuel consumption increase by 7.4 tons/hour, and flue gas emission of CO, NO
_x
, SO
₂
, all decreased. There is no significant change in mill outlet temperature (MOT).