Description of the biomass CHP technology based on biomass gasification The objective of the thermo-chemical biomass gasification process is the best possible conversion of solid biomass fuels into a high calorific product gas. Thereby, biomass reacts with a fumigator (air, oxygen, steam or CO2), which provide oxygen for the process. Due to the thermal cracking and the partial oxidation a product gas is formed. The composition of the product gas depends on the biomass fuel, the reaction conditions and the fumigator and consists of different concentrations of hydrogen (H2), carbon monoxide (CO), steam (H2O) and methane (CH4). In case of air as fumigator the product gas includes nitrogen (N2) as well. Char coal, ash with varying carbon contents and condensable low molecular hydrocarbons are produced besides the product gas. The char coal and the hydrocarbons (summarised as tar) are the products of an incomplete gasification.