Research On Character Of Dual Fuel Engine Of Marine

The energy crisis and environmental problems make natural gas engines become an important engine technology development direction. The diesel/CNG dual fuel engine causes more and more attention for its refitting convenient, economical and high thermal efficiency.We configure a dual fuel engine by using a marine diesel engine 2135G;design a circuit board to handle engine state parameter signals,control stepping motor and communicate with monitoring interface by using a MC9S12XDP512 singlechip. We design control system based on LabVIEW software to display the diesel engine speed, knock signal and control the stepping motor.Resonant air intake system is a kind of effective method to improve the air intake coefficient of engine and the dynamic performance. We design a resonant air intake system according to the resonance theory and study the influence of the resonator to the engine dynamic property. Test shows that resonant air intake system can increase air intake flow which does technical reserves for CNG single fuel engine power increasing.We study the influence of base oil amount to the dual fuel engine performance. Test shows that CO emission decreases while NOx emission increases with the increasing of base oil amount under the same load.and it is more apparent under small and middle load.We also study the influence of fuel supply advance angle to the dual fuel engine performance. Test shows that NOx emission increases while CO emission does not change significantly with the increasing of fuel supply advance angle. So it is not beneficial to NOx emission by increasing the fuel supply advance angle. But it will appear to be a serious afterburning phenomenon and the detonation value will increase if the fuel supply advance angle is too small.