N_2O FORMATION DURING COAL COMBUSTION IN FLUIDISED BEDS - IS IT CONTROLLED BY HOMOGENEUOUS OR HETEROGENEOUS REACTIONS?

摘要

This paper discusses the results of the experimental work undertaken to determine the N_2O and NO emissions from fluidised bed combustion. First, studies were carried out to measure the amounts of both NO and N_2O formed during the combustion of bituminous coals and that chars prepared from the same coals. Second, the combustion of the volatiles released during the devolatilisation of coals was investigated and the N_2O and NO emissions were measured. The analysis of HCN and NH_3 in volatiles was also undertaken. From our results, a better understanding of the issue of homogeneous reactions versus those of heterogeneous for the formation of N_2O is achieved.