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Renewable energy is widely used at recent time because the trend of fossil fuel price continues to increase.
Alternative energy from gasification process can be produced fuel gas that producer gas compositions such as carbon monoxide (CO), hydrogen (H2), methane (CH4), carbon dioxide (CO2) and other. This research study is based on analysis producer gas from downdraft gasifier by using coconut shell and coconut shell charcoal with the adjustable air speed at blower outlet 7, 10 and 14 m/s. The experimental result shows that the average producer gas composition of coconut shell and coconut shell charcoal are carbon monoxide (CO) 15.64, 17.39 %, hydrogen (H2) 15.89, 8.47 %, methane (CH4) 4.77, 2.36 %, carbon dioxide (CO2) 16.09 and 18.17 % respectively. The suitable air speed is 10 m/s will be given the highest efficiency of downdraft gasifier are 57.45, 84.59 %, the High Heating Value (HHV) are 6,307, 4,441 kJ/m3, fuel consumption rate are 2.58 and 2.86 kg/h respectively. According to the experimental result, the downdraft gasifier by using coconut shell can be improved as one potential energy of alternative energy in the next future.
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