Clean biomass gas

Biomass gas leaves the gasifier as the mixture of combustible and non-combustible gases along with tar, water vapour, dust and mineral vapour. Sulphur compounds such as hydrogen sulphide (H2S) and nitrogen compounds (NH3, HCN) in producer gas are undesirable as their condensates are corrosive and pollutants in exhuast gases. The generation of H2S is of little importance in gasification of biomass as long as sulphur content does not exceed 0.5%. The amount of NH 3 and HCN in the gas depends on the nitrogen content of the fuel. Fuel with nitrogen content less than 2 % is safe for gasification. Silicon oxide (SiO2) and iron oxide (Fe2O 3) in dust are important because of their abrasive nature.