Abstrack:
Availability of fossil energy sources is now limited due to high exploitation until now. Biogas is one of alternative energy, which may be developed to solve the energy problem. Biogas is product of the degradation of organic material through the anaerobic digestion process. Biogas consists of methane, carbon dioxide, water vapor, hydrogen sulfide and other gases. Biogas may be used as fuel in a combustion engine as the driving in electrical generators. Supply pressure of biodigester is usually low, so compressor is needed to increase pressure and stabilize the gas supply to the engine generator. Turbocharger which utilizes exhaust gas of Genset can be used to compress biogas. Specification of generator set rated power of 2000 watts (2200 watt peak) with a gasoline engine driver 5.5 HP single cylinder capacity 163 cc. Some adjustments needed in the generator set are on (1) compression ratio, (2) carburizing / mixer, (3) adjusting the spark plug gap, (4) the ignition timing and (5) other necessary treatments. Results show, that the turbine speed achieved 70,000 rpm during cold test using pressurized air 7 bars. A compressor output pressure 65 cm-water-column is achieved during unloaded hot test by engine speed of 4000 rpm. Results of test with biogas fuel show, which output power of generator, achieved 1700 W by test using turbocharger and 1200 W without turbocharger..
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