biomass are put into gasifier and begin reaction in the gasifier to generate fuel gas at high temperature.the ash shall be discharged through ash discharge device and will be isolated from the outside through rotary valve.meanwhile, no matter what the raw materials are rice hull or straw.the equipment may continue its work for a long time the fuel gas with high temperature through gasification contains little dust and tar. through primary dusting,the gas will directly enter into the combustion engine. the fuel gas with high temperature will not got cooling and tar treatment,the sensible heat and tar of the fuel gas are taken full advantage,and the fuel gas has high heat efficiency,the tar is broken up and completely burn up during the continuous high temperature combustion,with which the pollution of tar to the environment is avoided,the high temperature fume generating from combustion exchanges heat with media in the boiler,or is diectly used for drying by directly mixing with cold air then the fume will be exhausted to the free air by induced draft through chimney.