PEMANFAATAN GAS BUANG MOTOR PENGGERAK GENERATOR SET SEBAGAI PENGGERAK KOMPRESORBIOGAS

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 mostly consists of methane,and a view amount of carbon dioxide. 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 displacement 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, in the cold test with compressed air 6 bar obtained 46.000 rpm turbine speed, while the unloaded heat test obtained 35,300 rpm turbine speed of 3,500 rpm engine speed . In the loaded test, compressor outlet pressure is obtained 6,860 Pa (gauge) at the highest load 1600 watts, compressor outlet temperature is 80 ° C, under the auto ignition temperature at 537 ° C. Results of the momentarily loaded test, generator gained power output 1.600 watt from caloric value of biogas 22,992.28 kJ/m3, while on loaded test without the compressor 1000 watts of output power obtained from the caloric value of biogas 18,172.24 kJ/m3