Investigations On The Emission Characterisitic Of Methanol In Different Modes Applied To SI Engine

Any country’s economic development and energy issues are closely related. Thedemand fuel of internal combustion engines make up a large proportion of totalenergy consumption, so energy shortages highlighted the performance of the internalcombustion engine fuel supply and demand. The future production of oil fuel isdwindling, it is very imperative to research and develop alternative fuels. Methanol isrelatively cheap, can be extracted from wide variety of sources, such as coal which isvery rich in our country, so it is a suitable kind of alternative fuel for China’s nationalconditions.There are many ways to use methanol fuel in an internal combustion engine. Thisarticle focused on the application of different proportions of methanol gasolineblended fuel on a gasoline engine, the application of different proportions of methanolgasoline strengthen fuel on a gasoline engine and the application of methanolpyrolysis gas on a gasoline engine. The experiments are respectively controlled by theoriginal gasoline engine ECU, methanol ECU and methanol pyrolysis gas ECU.Studies have shown that when different proportions of methanol gasoline blendedfuel used on a gasoline engine, unregulated emissions of formaldehyde and methanolemissions increased and acetaldehyde emissions decreased with the increase ofmethanol proportion. TWC can reduce these exhaust emissions effectively.Comparison of three detection instruments (Fourier transform infrared spectrometerFTIR, gas chromatography and liquid chromatography instrument) for formaldehydeanalysis was performed, the results illustrate that FTIR could detect exhaustformaldehyde effectively and predict its emission law which is consistent with thepredicting trends of GC and HPLC, but the examination value is higher than GC andHPLC.Using different proportions of methanol gasoline strengthen fuel on a gasolineengine, with the increase in the proportion of methanol in the blended fuel, Nox, HCand acetaldehyde emissions reduce, while emissions of formaldehyde and methanolincrease. CO emissions does not change with methanol changed regularly. Thethree-way catalytic converter can reduce the exhaust emissions with the catalyticefficiency more than85%. With the increase fraction of methanol, engine power andtorque decrease. Burning methanol pyrolysis gas on a SI engine, methanol and formaldehydeemissions are relatively high. After catalytic conversion methanol emissions does notexceed10ppm, but the conversion efficiency is not very ideal for formaldehydeemissions. Engine fueled with methanol pyrolysis gas is running smoothly, thedynamic is basically the same as the original engine, can reach more than95%. Thedesign of cracker and electronic control system to achieve a completely smoothcracked gas mode switch starts from pure gasoline mode and completely cracked gasmode automatically run.