A Study On Performance And Emissions Of Methanol/F-T Diesel Dual Fuel Engine

With the continuous decrease of oil resources and increasingly stringentemission regulations, combined with the current situation of energy structureof China’s rich coal and meager oil, the development of new energy which isgiven priority to with coal based alternative fuel, has the congenital advantageand important strategic significance. Coal to methanol and oil are both coalprocessing of deep products. They have been ideal alternative fuels due to theirgood combustion and emission characteristics in the diesel engine.The research plans to form homogeneous mixture of methanol andcompress a small amount of F-T diesel to make an ignition, improving theenergy conversion efficiency of methanol. And to study the influence ofdifferent parameters on performance and emissions of methanol/F-T dieseldual fuel engine.We compared the single cylinder diesel engine performance by using0#diesel, light F-T diesel and heavy F-T diesel during the preliminary test. Themethanol injection system is controlled by an independent electronic controlinjection system. We determined the methanol injection location bycomparison with experimental data analysis.Through engine bench test, we have studied the methanol/F-T diesel dualfuel mode on the properties of single cylinder diesel engine.The results showthat compared with burning0#diesel, the engine power and torque havechanged a little while the fuel use cost greatly reduced by using methanol/F-Tdiesel dual fuel. The overall HC emission is4.5times of0#diesel. The COemissions declined as speed increases. The NOx emissions increase with the increase of rotational speed, and compared with0#diesel, it reduced by anaverage of48.41%. With the increase of rotational speed, the soot emissionsreduced obviously at first and then increased slowly. Compared with0#diesel,it reduced by an average of90.55%.Further study on the effects of fuel supply advance Angle, compressionratio, spray amount of methanol and other parameters on engine powerperformance, economy and emissions. The results show that the maximumtorque and power of three compression ratios at low speed are basically thesame. In the middle speed and the compression ratio comes to16.9, the enginepower performance the best. When the engine comes to high speed,15.93isthe best compression ratio on engine power performance. When thecompression ratio is16.9, HC and CO emissions are the best. NOXwill be theleast when the compression ratio is15.4. The soot increases with the increaseof compression ratio. When the fuel supply advance Angle comes to22°CABTDC, the engine power is the best while NOXemission is the worst. Thelowest HC emission comes when the fuel supply advance Angle is18°CABTDC and lowest CO emission comes when the fuel supply advance Angle is20°CA BTDC. With the increase of methanol proportion energy, HC emissionsshowed a trend of increase. The CO emission showed a trend of increase atlow and medium load, emissions are basically the same at heavy load. NOXemissions showed a trend of decrease. The soot emission is basic the same inlow and middle loads and decreases in heavy loads. Small changes of theproportion of energy had no significant effect on soot emission.Was studied the effects of different speed, fuel supply advance Angle, thecompression ratio, the mean effective pressure in cylinder and energy ratio ofmethanol engine on the emission of formaldehyde and carbon dioxide byengine bench test and FTIR. Finalized when the compression ratio is16.9andfuel supply advance Angle is22°CA BTDC and methanol maximum energy accounted for no more than0.75, and with the increase of load, continue toappropriately reduced, the engine can obtain the optimal level of emissions.To sum up, Methanol/F-T diesel dual fuel in a compression ignitionengine has a good application prospect. By changing the structural parametersof engine and methanol injection control parameters, the engine performanceand emissions can be effectively improved.