Combustion - Gas Fuels
Combustion of gaseous fuels (natural gas, digester gas, and landfill gas) in boilers, engines, turbines, flares, and other miscellaneous combustion devices results in the release of several criteria pollutants and toxic air contaminants to the atmosphere. Emissions typically include NOx, SOx, ROG, PM, CO, benzene, toluene, formaldehyde, xylenes, and other trace substances. Most emission factors are derived from source test results. This testing may include the speciation of nonmethane organic compounds and particulate matter in the stack gas exhaust. Factors can also be derived by applying an average destruction efficiency to combustible components of the gaseous fuel. A combination of both techniques has been used for equipment fired with digester gas and landfill gas.