Thermochemical Biomass Gasification is a high temperature process that produces a fuel gas, which after cleaning, can provide a good environmental performance and high flexibility in applications. The process is used to convert biomass (solid biomass, wastes) into a a combustible gas that can be used for different purposes. Typical feedstock for gasification is cellulosic biomass such as wood chips, pellets or wood powder, or agricultural byproducts like straw or husks. The produced gas is called producer gas or synthesis gas (syngas). The gasification of the feedstock takes place at 700° – 1600°C in the presence of a gasification medium. The gasification media used are air, oxygen, steam or a mixture of these.