Abstract
The desulfurization of fuel gas was studied by use of fluidize bed of dolomite and that of metal oxide-dolomite at temperature range of 400-900°C. The gas composition studied includes H2S, H2, CO, CO2, H2O and N2.
It was found that dolomite was one of the active sorbents for the hydrogen sulfide removal above the reaction temperature of 700°C rather than limestone, Fe2O3 and CuO.
Furthermore, the results of the experiments with dolomite suggested that dolomite reduced the concentration of H2S in the fuel gas to its equilibrium value according to the following two reactions.
700-900°C CaO+H2S=CaS+H2O
below 700°C CaO+H2S=CaS+CO2+H2O
The desulfurization activity of dolomite was improved at temperatures in the range 500-900°C by addition of metal oxides except that of Fe2O3. Particulary, CuO-dolomite removed 99% of H2S in the fuel gas during 3 hr of reaction at 700°C.
