Lower Furnace Stoichiometry Control

FW's Lower Furnace Stoichiometry Control was developed to help control the lower furnace hopper conditions created during deep staged low NOx combustion. Specifically this FW unique feature was developed to manage the fuel rich, smoky conditions as well as slag buildup in the lower furnace. Dark lower furnace/hopper conditions are common on many tangential fired units equipped with overfire air staging. This system includes nozzle tips and linkage modifications to independently direct a percentage of secondary combustion air into the furnace hopper. Besides reducing the dark lower furnace conditions, FW's experience with the LFSC system has also seen NOx benefits. The lower furnace concept is depicted as Figure above.