The study of energy conversion in a 2 ton/day waste-wood fixed bed gasifier

For the conversion of domestic waste-wood into energy, a fixed bed gasifier (0.9 m × 2.4 m) having the capacity of 2 ton/day was designed and constructed. The dual knife valve was used to feed waste-wood of which size was 3~5 cm and a rotary stoker system was installed in the bottom of gasifier. The pilot gasification system consisted of feeding system, fixed bed gasifier, gravity fine particle collector, heat exchanger for syngas cooling, ID fan, and cooling tower. The operation temperatures of gasifier were 700~1000 °C and the concentrations of syngas were CO: 25~40 vol%, H₂: 7~12 vol%, CH4: 2~4 vol%, CO₂: 12~24 vol%. The calorific value of syngas was 1100~1500 kcal/Nm³ and was enough to be applied in the industrial combustor. Also the gas engine was operated by using syngas from biomass gasifier and produced 1~4 kW of power.