OPTIMIZATION OF STAGED COMBUSTION CONDITIONS IN A FLUIDIZED BED FOR SIMULTANEOUS REDUCTION IN NOx AND SO2 EMISSIONS

Khan, Wasim Ullah; Gibbs, B.M.

doi:10.1016/b978-0-7506-0387-4.50084-x

Cited by 1 publication

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“…Hence, it is imperative to reduce the air pollution from coal combustion. Fluidized bed combustion can reduce both SO x and NO x emissions, as SO x could be removed by limestone fed into the combustion chamber and the formation of thermal NO x could be reduced by low‐temperature combustion in fluidized bed 4, 5. However, the N 2 O emissions from a fluidized bed combustor are usually quite high 6.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of nitrous oxide over a low‐cost catalyst

Yang

Zhuo

et al. 2010

Asia-Pacific J Chem Eng

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Nitrous oxide (N 2 O) is a significant greenhouse gas and its emissions from fluidized bed combustion systems can be controlled using catalytic conversion and decomposition. The catalytic decomposition of N 2 O was studied in a quartz fixed-bed reactor at 450-700 • C. The low-cost catalyst was prepared from fly ash and iron oxides, and was characterized in terms of the BET specific surface area and XRD. This study showed that both the Fe content on the catalyst surface and the calcination temperature during the preparation of the catalyst should be optimized in order to significantly improve the catalyst performance when used for N 2 O decomposition. The influences of O 2 , H 2 O, CO 2 and SO 2 on the N 2 O decomposition were investigated at the most reactive temperature. Experimental results showed that O 2 had a small negative effect on the catalytic activity, while CO 2 had no obvious effect on the N 2 O decomposition. The N 2 O conversion was still high even when H 2 O was present. However, the N 2 O conversion dropped sharply when H 2 O and O 2 were both present. The catalytic activity was reduced by SO 2 because of its reaction with the catalyst. The difference between the N 2 O conversion with H 2 O present and with both H 2 O and O 2 present was analyzed in order to determine the N 2 O decomposition mechanism. Two mechanisms for the N 2 O catalytic decomposition mechanism have been considered, of which the one with formation of oxygen atoms at two sites with migration and recombination shows better agreement with our experimental results. 

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Section: Introductionmentioning

confidence: 99%