Experimental Studies and the Chemical Kinetics Modelling of Oxidation of Hydrogen Sulfide Contained in Biogas

This paper presents the results of experimental and numerical research on the process of biogas air combustion. The purpose of the study was to determine the effect of biogas CO2 content on: (a) variations in SO2 concentrations in flue gas, (b) variations in the rates of the key reactions of oxidation of H2S to SO2.The subject of investigation were the gas mixtures: CH4/CO2 (of 25; 35 and 45 vol % CO2) with a varying hydrogen sulfide content. The experiments were conducted in a three-zone pipe furnace equipped with a swirl burner (Sg=1.26) with combustion substrate pre-mixing. It was noticed that the consumption of hydrogen sulfide was significantly reduced with the temperature decrease from 1223 K to 1023 K. The increase in the biogas carbon dioxide content inhibited the process of oxidation of H2S to SO2.