alternative combustion; pollution reduction; emission characteristics; HCCl
Abstract :
[en] The homogeneous charge compression ignition is an alternative combustion technology that can reduce automobile pollution, provided that the exhaust emission can be controlled. A parametric study can be useful in order to gain more understanding in the emission reduction possibilities via this new combustion technology. For this purpose, the inlet temperature, the equivalence ratio and the compression ratio are changed, respectively, from 30 to 70 degrees C, 0.28 to 0.41 and 6 to 14. Also the diluting, thermal and chemical effects of exhaust gas recirculation were studied. The emission of CO, CO2, O-2 and hydrocarbons has been measured using primary reference fuels. It appears that an increase in the inlet temperature, the EGR temperature, the equivalence ratio and the compression ratio results into a decrease of the emissions of CO and the hydrocarbons of up to 75%. The emission of CO2 increased, however, by 50%. The chemical parameters showed more complicated effects, resulting into a decrease or increase of the emissions, depending on whether the overall reactivity increased or not. If the reactivity increased, generally, the emissions of CO and hydrocarbons increased, while that of CO2 increased. The increase of CO2 emissions could be compensated by altering the compression ratio and the EGR parameters, making it possible to control the emission of the HCCI engine. (c) 2008 Elsevier Ltd. All rights reserved.
Machrafi H. Development and experimental validation of kinetic schemes for hydrocarbon mixtures for HCCI applications. Investigation of the auto-ignition process and the application to internal combustion engines. PhD thesis, University Paris 6; 2007.
Lee K., Lee C., Ryu J., and Kim H. An experimental study on the two-stage combustion characteristics of a direct-injection-type HCCI engine. Energy Fuels 19 2 (2005) 393-402
Sjöberg M, Dec JE. Isolating the effects of fuel chemistry on combustion phasing in an HCCI engine and the potential of fuel stratification for ignition control. SAE World Congress & Exhibition, Detroit; 2004, SAE 2004-01-0557.
Christensen M, Johansson B. Supercharged homogeneous charge compression ignition (HCCI) with exhaust gas recirculation and pilot fuel; 2000, SAE 2000-01-1835.
Bowman C.T. Kinetics of pollutant formation and destruction in combustion. Prog Energy Combust Sci 1 (1975) 33-45
Hyvonen J, Haraldsson G, Johansson B. Operating range in a multi cylinder HCCI engine using variable compression ratio; 2003, SAE 2003-01-1829.
Flowers D., Aceves S., Westbrook C.K., Smith R., and Dibble R. Detailed chemical kinetic simulation of natural gas HCCI combustion: gas composition effects and investigation of control strategies. J Eng Gas Turb Power 123 (2001) 433
Sullivan J.L., Baker R.E., Boyer B.A., Hammerle R.H., Kenney T.E., Muniz L., et al. CO2 emission benefit of diesel (versus Gasoline) powered vehicles. Environ Sci Technol 38 12 (2004) 3217-3223
Prucz J.C., Clark N.N., Gautam M., and Lyons D.W. Exhaust emissions from engines of the detroit diesel corporation in transit buses: a decade of trends. Environ Sci Technol 35 9 (2001) 1755-1764
Gabele P.A., and Pyle S.M. Emissions from two outboard engines operating on reformulated gasoline containing MTBE. Environ Sci Technol 34 3 (2000) 368-372
Wu C.-W., Chen R.-H., Pu J.-Y., and Lin T.-H. The influence of air-fuel ratio on engine performance and pollutant emission of an SI engine using ethanol-gasoline-blended fuels. Atmos Environ 38 (2004) 7093-7100
Fujimoto HG, Senda J, Ito T, Asao S, Higashi K. Characteristics of intermediate products generated during diesel combustion by means of total gas sampling. SAE International, Powertrain and Fluid Systems Conference and Exhibition; 2004, 2004-01-2923.
Flowers D, Aceves SM, Marinez-Frias J, Smith JR, Au M, Girard J, et al. Operation of a four-cylinder 1.9L propane fueled homogeneous charge compression ignition engine: basic operating characteristics and cylinder-to-cylinder effects; 2001, SAE 2001-01-1895.
Sjöberg M, Dec JE. Combined effects of fuel-type and engine speed on intake temperature requirements and completeness of bulk-gas reactions for HCCI combustion; 2003, SAE 2003-01-3173.
Flowers D, Aceves S, Smith R, Torres J, Girard J, Dibble R. HCCI in a CFR engine: experiments and detailed kinetic modeling. SAE International, SAE World Congress; 2000, 2000-01-0328.
Lü X., Chen W., and Huang Z.A. A fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined with controllable EGR. Part 1. The basic characteristics of the HCCI combustion. Fuel 84 9 (2005) 1074-1083
Lü X., Chen W., and Huang Z.A. A fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined with controllable EGR. Part 2. Effect of operating conditions and EGR on HCCI combustion. Fuel 84 9 (2005) 1084-1092
Tanaka S., Ayala F., Keck J.C., and Heywood J.B. Two-stage ignition in HCCI combustion and HCCI control by fuels and additives. Combust Flame 132 (2003) 219-239
Lavoie G.A., Heywood J.B., and Keck J.C. Experimental and theoretical investigation of nitric oxide formation in internal combustion engines. Combust Sci Technol 1 (1970) 313-326
Eng Jr JA, Leppard WR, Najt PM, Dryer F. The interaction between nitric oxide and hydrocarbon oxidation chemistry in a spark-ignition engine. International fuels and lubricants meeting and exposition, Tulsa; 1979, SAE 972889.
Yao C., Cheung C.S., Cheng C., and Wang Y. Reduction of smoke and NOx from diesel engines using a diesel/methanol compound combustion system. Energy Fuels 21 2 (2007) 686-691
Faravelli T., Frassoldati A., and Ranzi E. Kinetic modeling of the interactions between NO and hydrocarbons in the oxidation of hydrocarbons at low temperatures. Combust Flame 132 (2003) 188-207
Frassoldati A., Faravelli T., and Ranzi E. Kinetic modeling of the interactions between NO and hydrocarbons at high temperature. Combust Flame 135 (2003) 97-112
Mitchell DL, Pinson JA, Litzinger TA. The effects of simulated EGR via intake air dilution on combustion in an optically accessible DI diesel engine. SAE International. Fuels and Lubricants Meeting and Exhibition; 1993, SAE-932798.
Li J, Chae JO, Park SB, Paik HJ, Park JK, Jeong YS, et al. Effect of intake composition on combustion and emission characteristics of DI diesel engine at high intake pressure. SAE International, International Congress and Exposition; 1997, SAE-970322.
Yamada H., Suzaki K., Sakanashi H., Choi N., and Tezaki A. Kinetic measurements in homogeneous charge compression of dimethyl ether: role of intermediate formaldehyde controlling chain branching in the low-temperature oxidation mechanism. Combust Flame 140 (2005) 24-33
