Third quarterly technical summary report on the homogeneous production and removal of NO/sub x/ from combustion exhaust flows. [27 reactions of sulfur or sulfur compounds with other gases or vapors]

The addition of ammonia to the exhaust stream of stationary combustors is a promising approach toward reducing NO/sub x/ emissions. The use of high sulfur-content fuels will produce moderate quantities of SO/sub 2/ and other sulfur-bearing compounds which may affect the effectiveness of this thermal deNO/sub x/ process. Modeling efforts indicate that the presence of SO/sub 2/ is slightly beneficial in removing NO above 1250K. In addition, experiments show that the ammonia species (NH/sub i/, i = 1,2,3) have no appreciable reaction rate with SO/sub 2/. An explanation of the effect of SO/sub 2/ on the thermal deNO/sub x/ process is presented, as well as preliminary calculations leading to the measurement of the key reaction of H + SO/sub 3/.