Emissions of N2O, CO, CH4, COS and CS2 from stationary combustion sources.

This report presents the results from measurements of emissions, especially of nitrous oxide (NaO), from different kinds of stationary combustion sources in Sweden. Emission data have been also determined for carbon monoxide (CO), methane (CH4), ethane C2H6), propane (C3H8), carbon disulfide (CS2) and carbonyl sulfide (COS). The investigation included seventeen combustion plants, representing different dimensions and burning techniques. The fuels used were oil, coal, pulverized coal, natural gas, wood chips, peat, firewood, and black liquor. Concerning the NaO emission no significant differences could be observed for the various fuels. However, the emission seemed to depend on the type of combustion technique. The emissions of N2O from coal and peat combustion in fluidized beds were about 100 ppmv (-70 mg/MJ) and 50 ppmv (-35 mg/MJ), respectively. The larger oil-fired incineration plants emitted approximately 30 ppmv N2O (-15 mg/MJ). For the other plants investigated the concentrations of N2O in the flue gases were less than 10 ppmv (-5 mg/MJ). It should be noted that the amounts of N2O relative to the energy output are based on rough estimations. The emissions of CO and methane were less than 200 and 5 ppmv, respectively, except for combustion of wood chips and firewood, where the values were much higher (CO sometimes exceeding 2000 ppmv, methane 300 ppmv). The COS concentration did not exceed 100 ppbv. CS2, ethane and propane concentrations were, in most of the cases, under the limit of detection.