To utilize biogas effectively, microwave plasma was applied to partial oxidation reforming of biogas. The reformulation characteristics of biogas were investigated by experiments using two circular nozzles of different sizes. With the smaller nozzle, stable reformulation of biogas stably occurred over a wider range of equivalence ratio than with the larger nozzle, because the damping of microwaves was inhibited. The concentrations of H2 and CO increased, and CO2 concentration decreased with increasing equivalence ratio. In this method, CO2 is decomposed, and in the high equivalence ratio region the amount of CO2 in the reformulation gas is less than the amount of supplied CO2. When CH4 is completely reformed into H2 and CO, cold gas efficiency is about 95%. However, the maximum value of cold gas efficiency is approximately 110% with the smaller nozzle, because CO2, which does not have calorific value, is decomposed into CO, which does have calorific value.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)