Influence of SO2 on the NO/N2O chemistry in fluidized bed combustion 2. Interpretation of full-scale observations based on laboratory experiments
Artikel i vetenskaplig tidskrift, 1993

In circulating fluidized bed combustion of coal, significant interactions between desulfurization by limestone and emissions of nitrogen oxides (NO, N2O) are generally observed. In order to facilitate interpretation of experimental results obtained in a 12 MW circulating fluidized bed boiler, a series of laboratory tests have been carried out. The tests include homogeneous CO and HCN oxidation in the presence of different concentrations of SO2, CO oxidation catalysed by calcined and partly sulfated limestone particles, and formation and reduction of NO and N20 over bed material containing char. The presence of SO2 in the gas is shown to decrease the rate of homogeneous CO and HCN oxidation and thereby change the product distribution of the nitrogen-containing species. Unlike sulfated limestone, calcined limestone (CaO) is shown to be a good catalyst for oxidation of CO. A lower mean CO concentration is therefore expected in fluidized bed combustors during injection oflimestone. This indirectly influences the nitrogen chemistry. Finally, the influence of NO and O2 on the formation of N2O from char was studied.

sulfur

N2O

NO

combustion

CO

fluidized beds

SO2

Författare

Kim Dam-Johansen

Lars-Erik Åmand

Chalmers, Institutionen för energiteknik

Bo G Leckner

Chalmers, Institutionen för energiteknik

Fuel

0016-2361 (ISSN)

Vol. 72 565-571

Drivkrafter

Hållbar utveckling

Ämneskategorier

Energiteknik

Annan naturresursteknik

Styrkeområden

Energi

Infrastruktur

Chalmers kraftcentral