Effect of SO2 on the reduction of NOx by reburning with methane
1991; Elsevier BV; Volume: 70; Issue: 10 Linguagem: Inglês
10.1016/0016-2361(91)90233-z
ISSN1873-7153
AutoresH.K. Chagger, Philip Raymond Goddard, P.L. Murdoch, A. Williams,
Tópico(s)Catalytic Processes in Materials Science
ResumoAn investigation was carried out in order to find out any possible interactions between NOx and SO2 during reburning. The primary fuel used was methane doped with nitric oxide (600 ppm) and sulphur dioxide (1000 ppm) in order to approximately simulate the same type of conditions found in coal combustion. These concentrations were selected to simulate conditions where bituminous coal containing 1.5–1.7 wt% sulphur is used and the overall stoichiometry was fuel-air and kept constant at 1.1. Methane was also used as the reburn gas. Concentrations of NOx and SO2 were measured at various heights of the chamber for 0, 30 and 50% reburn. The optimum reduction of NOx to about 35–40% was achieved using 30% reburn. Experiments showed that there was a slight reduction in the final NOx concentration when SO2 was present and a small quantity of H2S was also formed in the reburn region. This reduction in NOx is attributed to the reaction of HS + NO = NS + OH, which is similar to the main reburn reaction of CH + NO = HCN + O.
Referência(s)