Methanol Reforming Compound Cycle On Internal Combustion Engines

Qinghai-Tibet railway lays several demands on its power system: low emission for the permafrost, adequate power for high altitude and continuous slope, economy for maintenance. The proposed system takes methanol as its energy source and has its main output from a gas engine fueled with methanol reforming gas.Firstly, there gives dynamics and thermodynamics of methanol reforming reaction.Secondly, the working process of engine is modeled with the application of Otto Cycle and real gas. With the aid of newly-built model, on system performance the effects of fuel supplying method, lean combustion, water content of methanol, application of Miller Cycle and adiabatic design are also studied. Direct injection near the top dead center is suggested for more output and higher efficiency; lean combustion is suggested for higher indicated thermal efficiency and lower combustion temperature; high water content, for lower combustion temperature when engine generating its maximum, Miller Cycle, for higher efficiency; adiabatic design, to enhance Miller Cycle and waste heat recovery.Thirdly, numeric analysis based on 16V280 proves the new system to be clean and efficient.Finally, it comes to a conclusion of the principles of this design.