Energy consumption and GHG emissions of GTL fuel by LCA: Results from eight demonstration transit buses in Beijing

Gas-to-liquids (GTL) as an alternative to diesel is considered to be one of the technical options to reduce petroleum consumption in the on-road transportation sector. Between May and August 2007, a joint demonstration program by Tsinghua University, Beijing Transit, Cummins Corporation and Shell Corporation was carried out in Beijing. The program focused on the supply systems and vehicle use of GTL fuel. The demonstration fleet was formed by four transit buses fueled with GTL and four with diesel. It was demonstrated that GTL has good compatibility with diesel in terms of fuel supply system and vehicle use. This paper compares the energy consumption and GHG emissions of diesel and GTL fuel supply chains by life cycle analysis based on demonstration results. The results indicate GTL's large range (reported 54-70%) in synthesis efficiency, as the key factor in determining energy consumption and GHG emissions within the GTL fuel supply chain. For the probable case (GTL synthesis efficiency: 65%), the life cycle energy consumption and GHG emissions of GTL fuel are 42.5% and 12.6% higher than that of diesel. For two sensitivity analysis cases (GTL synthesis efficiency: 54% and70%), energy consumptions are 74.2% and 31.2% higher and GHG emissions are 27.3% and 7.4% higher than that of the diesel fuel supply chain. If the efficiency of the GTL synthesis process is improved to 75%, then the GHG emissions level of the GTL fuel supply chain can be reduced to the same level as the diesel fuel supply chain.

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

[2]  Shiyu Tan,et al.  GTL or LNG: which is the best way to monetize “stranded” natural gas? , 2008 .

[3]  Francesco Cherubini,et al.  Crop residues as raw materials for biorefinery systems - A LCA case study , 2010 .

[4]  Trevor Pryor,et al.  Life-cycle assessment of diesel, natural gas and hydrogen fuel cell bus transportation systems , 2007 .

[5]  H. Huo,et al.  Projection of Chinese Motor Vehicle Growth, Oil Demand, and CO2 Emissions Through 2050 , 2007 .

[6]  Zhiyuan Hu,et al.  Net energy, CO2 emission, and life-cycle cost assessment of cassava-based ethanol as an alternative automotive fuel in China , 2004 .

[7]  Kiyoshi Dowaki,et al.  A Life Cycle Analysis on a Bio-DME production system considering the species of biomass feedstock in Japan and Papua New Guinea , 2010 .

[8]  José Rodríguez-Fernández,et al.  Combining GTL fuel, reformed EGR and HC-SCR aftertreatment system to reduce diesel NOx emissions. A statistical approach , 2009 .

[9]  Ulugbek Azimov,et al.  Visualization of Gas-to-Liquid (GTL) Fuel Liquid Length and Soot Formation in the Constant Volume Combustion Chamber , 2008 .

[10]  Xunmin Ou,et al.  Alternative fuel buses currently in use in China: Life-cycle fossil energy use, GHG emissions and policy recommendations , 2010 .

[11]  Jing Tao,et al.  Economic, energy and environmental evaluations of biomass-based fuel ethanol projects based on life cycle assessment and simulation , 2009 .

[12]  Xunmin Ou,et al.  Energy consumption and GHG emissions of six biofuel pathways by LCA in (the) People's Republic of China , 2009 .

[13]  Bp Upstream.  2002—Emergence of the Gas-to-Liquids Industry: a Review of Global GTL Developments , 2002 .

[14]  José Rodríguez-Fernández,et al.  Performance, combustion and emissions of a diesel engine operated with reformed EGR. Comparison of diesel and GTL fuelling , 2009 .

[15]  Keat Teong Lee,et al.  Life cycle assessment of palm biodiesel: Revealing facts and benefits for sustainability , 2009 .

[16]  中華人民共和国国家統計局.  China statistical yearbook , 1988 .

[17]  Hewu Wang,et al.  Performance of Euro III common rail heavy duty diesel engine fueled with Gas to Liquid , 2009 .

[18]  Marko P. Hekkert,et al.  Natural gas as an alternative to crude oil in automotive fuel chains well-to-wheel analysis and transition strategy development , 2005 .

[19]  Ijaz Hossain,et al.  Lifecycle analysis of different urban transport options for Bangladesh , 2007 .

[20]  Xiaoyu Yan,et al.  Life cycle analysis of energy use and greenhouse gas emissions for road transportation fuels in China , 2009 .

[21]  Patrik Soltic,et al.  Experimental investigation of mineral diesel fuel, GTL fuel, RME and neat soybean and rapeseed oil combustion in a heavy duty on-road engine with exhaust gas aftertreatment , 2009 .

[22]  Zhang Xiliang,et al.  Energy consumption and GHG emissions of six biofuel pathways by LCA in China , 2009 .

[23]  Paulina Jaramillo,et al.  Comparative analysis of the production costs and life-cycle GHG emissions of FT liquid fuels from coal and natural gas. , 2008, Environmental science & technology.