Effect of Catalytic Converter on the Performance and Emissions of a Diesel Engine Operated in Dual-Fuel Mode with Raw-Biogas
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Effect of a catalytic converter on the performance and emissions of a small diesel engine is investigated experimentally. The small diesel engine with an output power (rated) 4.41 kW is operated on single and dual-fuel modes. For the case of dual-fuel operation, the raw biogas which contain methane concentration 60% is used. The flowrate of the biogas is varied from 2 Liter/min, 4 Liter/min, and 6 Liter/min, respectively. The results show that the catalytic converter does not affect the power, specific fuel consumption and thermal efficiency of the engine. The output power, brake thermal efficiency, diesel replacement ratio, and specific fuel consumption of the compression ignition engine are the same when it is operated with and without catalytic converter. The similar facts are shown by the compression ignition engine when it is operated in pure-diesel and dual-fuel modes. However, the catalytic converter significantly affects the exhaust gas emissions. For the engine run in pure-diesel mode, the catalytic converter decreases smoke emission significantly. For the compression ignition engine run in dual-fuel mode, the catalytic converter decreases carbon oxide number, smoke emission, and hydrocarbon number significantly. It is suggested to install a catalytic converter to a diesel engine when it is run in dual-fuel mode in order to diminish the bad environmental impact.