Abstract
The diesel engine has the high thermal efficiency and can be powered by the various fuels. However, the contents of exhaust gas from diesel engine (NO_X, SO_2 and other toxic substances) cause to the air pollution. The objectives of this study is to investigate experimentally the influence on combustion in the diesel engine by mixing various gas (N_2, CO_2, CH_4, N_2+CH_4, CO_2+CH_4 and such low-calorie gas as renewable bio-mass fuels), and changing combustion air temperature to come close to EGR(Exhaust Gas Recirculation) system. The thermal efficiency, the rate of heat relrase, the chemical species of gas concentrations and the pressure in the cylinder are measured. The results obtained are as follows. (1) The temperature and pressure in the cylinder are higher by mixing methane with intake gas. (2) The NO_x concentration and the SO_2 concentration of the exhaust gas can be reduced at the same time by mixing nitrogen or carbon dioxide with methane.
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