Effect of injection timing on combustion, performance and emissions of lean-burn syngas (H2/CO) in spark-ignition direct-injection engine

This article is aimed at exploring syngas as an alternative fuel for the modern gas engines. It presents the experimental results on the effect of start of injection on combustion, performance and emissions of a direct-injection spark-ignition engine powered by syngas of H2/CO composition. The engine was operated with wide open throttle at minimum advance to achieve maximum brake torque. Two different start of injections were selected to represent before and after inlet valve closing and the excess air ratio (λ) was set at 2.3. The engine operation at start of injection = 120° before top dead center was found to be best for combustion and performance at speed up to 2100 r/min. At engine speed higher than 2100 r/min, this start of injection does not permit maximum performance due to injection duration limitation. Hence, early injection at start of injection = 180° before top dead center was adopted at higher speed with better combustion and performance. Therefore, best performance of syngas in direct-injection spark-ignition engine could be attained by setting start of injection at 120° before top dead center for lower speeds and at 180° before top dead center for speed greater than 2100 r/min. Even though fast combustion of syngas suggested late injection for better combustion, performance and emissions, its lower calorific value resulted in operational limitations for direct-injection system particularly at higher speeds maintaining air–fuel ratio close to the stoichiometry.

[1]  Christian Spaeth,et al.  Performance Characteristics of a Diesel Fuel Piloted Syngas Compression Ignition Engine , 2012 .

[2]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[3]  J. T. Riley,et al.  A novel biomass air gasification process for producing tar-free higher heating value fuel gas , 2006 .

[4]  Taib Iskandar Mohamad,et al.  Compressed Natural Gas Direct Injection (Spark Plug Fuel Injector) , 2010 .

[5]  Olivier Le Corre,et al.  Combustion of Syngas in Internal Combustion Engines , 2008 .

[6]  Shaharin Anwar Sulaiman,et al.  Syngas (H2/CO) in a spark-ignition direct-injection engine. Part 1: Combustion, performance and emissions comparison with CNG , 2014 .

[7]  Dimitrios T. Hountalas,et al.  Study of the performance and exhaust emissions of a spark-ignited engine operating on syngas fuel , 2007 .

[8]  M. B. Baharom,et al.  Analysis of engine characteristics and emissions fueled by in-situ mixing of small amount of hydrogen in CNG , 2011 .

[9]  P. Paul,et al.  Biomass derived producer gas as a reciprocating engine fuel—an experimental analysis , 2001 .

[10]  Adam Newcomer,et al.  An Engineering-Economic Analysis of Syngas Storage , 2002 .

[11]  B. Gamino,et al.  Numerical simulation of syngas combustion with a multi-spark ignition system in a diesel engine adapted to work at the Otto cycle , 2010 .

[12]  Giacobbe Braccio,et al.  On laminar flame speed correlations for H2/CO combustion in premixed spark ignition engines , 2014 .

[13]  S. Sulaiman,et al.  Effect of Air-fuel Ratio on the Combustion Characteristics of Syngas (H2:CO) in Direct-injection Spark-ignition Engine☆ , 2014 .

[14]  Zainal Alimuddin Zainal,et al.  A preliminary investigation of compressed producer gas from downdraft biomass gasifier. , 2010 .

[15]  Ajay Shah,et al.  Performance and emissions of a spark-ignited engine driven generator on biomass based syngas. , 2010, Bioresource technology.

[16]  Marc William Wiseman.  Spark ignition engine combustion process analysis , 1990 .

[17]  Bang-quan He,et al.  Spark ignition natural gas engines—A review , 2007 .

[18]  A. Rashid A. Aziz,et al.  Comparison of HCCI and SI Characteristics on Low Load CNG-DI Combustion , 2011 .

[19]  H. S. Mukunda,et al.  Development of producer gas engines , 2005 .

[20]  Ricardo Chacartegui,et al.  Gas and steam combined cycles for low calorific syngas fuels utilisation , 2013 .

[21]  S. Sulaiman,et al.  Methane enrichment of syngas (H2/CO) in a spark-ignition direct-injection engine: Combustion, performance and emissions comparison with syngas and Compressed Natural Gas , 2015 .

[22]  Andrew L. Emtage,et al.  Evaluation of IMEP Routines and Analysis Errors , 1996 .

[23]  Zainal Alimuddin Zainal,et al.  Performance and Emission Characteristics of Supercharged Biomass Producer Gas-diesel Dual Fuel Engine , 2011 .

[24]  M. B. Baharom,et al.  The effects of fuel-injection timing at medium injection pressure on the engine characteristics and , 2011 .

[25]  Prabir Basu,et al.  Biomass Gasification and Pyrolysis: Practical Design and Theory , 2010 .

[26]  Pedro Haro,et al.  Bio-syngas to gasoline and olefins via DME – A comprehensive techno-economic assessment , 2013 .

[27]  Danielle D. Bellmer,et al.  Gasification performance of switchgrass pretreated with torrefaction and densification. , 2014 .

[28]  Barbara Zielinska,et al.  Characterization of trace contaminants in syngas from the thermochemical conversion of biomass , 2013 .

[29]  Ali Mohammadi,et al.  Performance and combustion characteristics of a direct injection SI hydrogen engine , 2007 .

[30]  Shaharin Anwar Sulaiman,et al.  Combustion characteristics of late injected CNG in a spark ignition engine under lean operating condition , 2012 .

[31]  William D. Batchelor,et al.  Evaluation of Syngas Storage Under Different Pressures and Temperatures , 2009 .

[32]  M. Adlan Abdullah,et al.  An Experimental Investigation of Hydrogen Combustion in a Direct Injection Spark Ignition Natural Gas Engine , 2009 .

[33]  Pradeep Bansal,et al.  Spark-ignition engine performance with ‘Powergas’ fuel (mixture of CO/H2): A comparison with gasoline and natural gas , 2006 .

[34]  H. S. Mukunda,et al.  Biomass gasification technology - a route to meet energy needs , 2004 .

[35]  Fredrik Königsson,et al.  Advancing the Limits of Dual Fuel Combustion , 2012 .