Performance and emissions characteristics of a lean-burn marine natural gas engine with the addition of hydrogen-rich reformate |
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| Affiliation: | 1. Key Laboratory of High Performance Ship Technology, Wuhan University of Technology, Ministry of Education, Wuhan, Hubei, 430063, PR China;2. School of Energy and Power Engineering, Wuhan University of Technology, Wuhan, Hubei, 430063, PR China;1. Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan, Hubei 430063, PR China;2. School of Energy and Power Engineering, Wuhan University of Technology, Wuhan, Hubei 430063, PR China;1. Technological Center, Doctorate Course in Environmental Engineering, Federal University of Santa Catarina, Brazil;2. Faculty of Energy and Environmental Engineering, Silesian University of Technology, Gliwice, Poland;3. Technology Center, Master Course in Energy Engineering in Agriculture, University of West Paraná, Brazil;4. Center of Engineering, Master Course in Environmental Sciences, Federal University of Pelotas, Rio Grande do Sul, Brazil;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;2. College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China;3. Department of Mechanical Engineering, Wayne State University, 5050 Anthony Wayne Dr., Detroit, MI 48202, USA;4. Key Laboratory of Advanced Manufacture Technology for Automobile Parts, Ministry of Education, Chongqing University of Technology, Chongqing 400054, China;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;2. Department of Mechanical Engineering, Wayne State University, 5050 Anthony Wayne Dr., Detroit, MI 48202, USA;3. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China;4. College of Mechanical & Electrical Engineering, Central South University of Forestry & Technology, Changsha 410004, China |
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| Abstract: | The exhaust gas-fuel reforming technique known as reformed exhaust gas recirculation (REGR) can generate on-board hydrogen-rich gas mixture (i.e., reformate) by catalytic reforming of the exhaust gas and fuel added into the reformer and then recirculate the reformate into the engine cylinder, which can realize the combination of hydrogen-rich lean combustion and exhaust gas recirculation. The REGR technique can be employed to achieve efficient and stable lean-burn combustion for the marine engine fueled with natural gas (i.e., marine NG engine) and it is considered as an effective way to meet the stringent ship emissions regulations. In the present study, an experimental investigation into the effects of reformate addition ratio (Rre) and excess air ratio (λ) on the combustion and emissions characteristics of a marine NG engine under various loads was conducted, and the potential of applying the REGR technique in a marine NG engine to achieve low emissions (i.e., International Maritime Organization Tier Ⅲ emissions legislations for international ships) was discussed. The results indicate that the addition of the hydrogen-rich reformate gases can extend lean-burn limit. For a given λ, the flame development duration and rapid combustion duration decrease with the increase of Rre, and the combustion efficiency is improved. The brake specific NOx emissions first increase and then decrease with the increase of Rre due to the competition between the combustion phase and total heat release value. The brake specific THC emissions decline with the increase of Rre, while the reverse holds for the brake specific CO emissions, and the behavior tends to be obvious under large λ. It is demonstrated that the combination of REGR and the lean-burn combustion strategy can improve the trade-off relationship between the NOx emissions and brake specific fuel consumption of the marine NG engine to meet the IMO Tier Ⅲ NOx emissions legislations and maintain relatively low brake specific fuel consumption. |
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| Keywords: | Reformed exhaust gas recirculation Hydrogen-rich reformate Marine engine Liquefied natural gas Combustion and emissions Thermal efficiency |
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