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This paper is a review of the state of the art of biomass gasification and   the future of using biomass in Serbia and it presents researches within the   project “The Development of a CHP Plant with Biomass Gasification”. The   concept of downdraft demonstration unit coupled with gas engine is adopted.   Downdraft fixed-bed gasification is generally favored for CHP, owing to the   simple and reliable gasifiers and low content of tar and dust in produced   gas. The composition and quantity of gas and the amount of air are defined by   modeling biomass residues gasification process. The gas (290-400m3/h for 0.5-   0.7MW biomass input) obtained by gasification at 800oC with air at   atmospheric pressure contains 14% H2, 27% CO, 9% CO2, 2% CH4, and 48% N2, and   its net heating value is 4.8-6 MJ/Nm3. The expected gasifier efficiency is up   to 80%. The review of the work on biomass gasification has shown that the   development of technology has reached the mature stage. There are CHP plants   with biomass gasification operating as demonstration plants and several   gasification demonstration units are successfully oriented to biofuel   production. No attempt has been made here to address the economic feasibility   of the system. Economics will be the part of a later work as firmer data are   acquired

Biomass gasification with CHP production: A review of state of the art technology and near future perspectives