Experimental Investigation of NOx and CO Emissions from Fuel Rich-Lean Flame of Natural Gas

摘要

NO_x and CO emissions of fuel rich-lean flame of natural gas water heaters were experimentally investigated. Fuel-rich and fuel-lean flame with different air factors were analyzed separately. Emission of fuel-rich flame is CO whereas emission of fuel-lean is NO_x, and fuel rich-lean ratio is the most important factor for NO_x and CO emission. If fuel-rich flame α_1 is changed with constant fuel-lean flame α_2,NO_x emission decreases and CO emission increases evidently. If α_2 is changed with constant α_1, NO_x decreases slightly and CO increases initially and then decreases. Depressing fuel-lean flame can strengthen excess O_2 diffusion to fuel-rich flame, and then reduces NO_x and CO emissions.