N_2O and NO Emissions from CFBC Cofiring Dried Sewage Sludge, Wet Sewage Sludge with Coal and PE

摘要

Experiments on cofiring dried sewage sludge, wet sewage sludge with coal and polyethylene (PE) were carried out on a pilot scale 0.15MWt circulating fluidized bed combustion (CFBC) plant, and the influence of furnace temperatures, cofiring rates on N_2O and NO emissions was investigated. Temperature is an effective parameter influencing N_2O emission, and higher temperature leads to significant N_2O reduction and decrease of conversion ratio of fuel-N to N_2O. Increasing in cofiring rates leads to higher nitrogen content in the mixed fuel, which could result in higher NO and N_2O emissions from combustion. With more sewage sludge addition, higher NO but lower N_2O emissions are observed. N_2O emission from cofiring wet sewage sludge with coal is higher than that from cofiring dried sewage sludge with coal and PE, and fuel-N conversion ratio to N_2O and NO is much higher in cofiring wet sewage sludge with coal than that in cofiring dried sewage sludge with coal and PE.