Under Different Working Conditions Carbon Oxides and Nitrogen Oxides Emission of n-Butanol and LNG in Diesel Engine

Abstract

Through the establishment of covering substances such as CH4, C4H10O, nitride specific combustion reaction mechanism, carbon oxides and nitrogen oxides emissions can be simulated by CHEMKIN-PRO at the four fuel mixing ratios and same excess air coefficient, the Man 6S35ME-B9dual-stroke diesel engine was used as the experimental object. Changes in temperature, pressure, mole fraction of NO and mole fraction of CO2 in the reactor were investigated at 1.5, and the influence factors of crank angle on pollutant emission of marine diesel engine under various operating conditions were studied. The simulation results show that with the loss of the diesel engine rotating speed, exhaust temperature and exhaust pressure significantly reduced. In the meantime, the mole-percent of NO and CO2 decreased with the decrease of rotational speed. Compared with the rotational speed of 142 r/min, the molar mass of NO and CO2 in exhaust gas decreased by 54.7% and 24.1% at 89.5 r/min, respectively.