Because of the potential to reduce NOx and PM emissions simultaneously and the utilization of biofuel, diesel/compressed natural gas (CNG) dual-fuel combustion mode with port injection of CNG and direct injection of diesel has been widely studied. While in comparison with conventional diesel combustion mode, the dual-fuel combustion mode generally leads lower thermal efficiency, especially at low and medium load, and higher carbon monoxide (CO) and total hydrocarbons (THC) emissions. In this work, n-butanol was blended with diesel as the pilot fuel to explore the possibility to improve the performance and emissions of dual-fuel combustion mode with CNG. Various pilot fuels of B0 (pure diesel), B10 (90% diesel/10% n-butanol by volume basis), B20 (80% diesel/20% n-butanol) and B30 (70% diesel/30% n-butanol) were compared at the CNG substitution rate of 70% by energy basis under the engine speeds of 1400 and 1800 rpm. The experiments were carried out by sweeping a wide range of pilot fuel start of injection timings based on the same total input energy including pilot fuel and CNG. As n-butanol was added into the pilot fuel, the pilot fuel/CNG/air mixture tends to be more homogeneous. The results showed that for the engine speed of 1400 rpm, pilot fuel with n-butanol addition leads to a slightly lower indicated thermal efficiency (ITE). B30 reveals much lower NOx emission and slightly higher THC emissions. For the engine speed of 1800 rpm, B20 can improve ITE and decrease the NOx and THC emissions simultaneously relative to B0.
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ASME 2018 Internal Combustion Engine Division Fall Technical Conference
November 4–7, 2018
San Diego, California, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5198-2
PROCEEDINGS PAPER
Effects of N-Butanol Content on the Dual-Fuel Combustion Mode With CNG at Two Engine Speeds Available to Purchase
Xiangyu Meng,
Xiangyu Meng
Dalian University of Technology, Dalian, China
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Wuqiang Long,
Wuqiang Long
Dalian University of Technology, Dalian, China
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Yihui Zhou,
Yihui Zhou
Dalian University of Technology, Dalian, China
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Mingshu Bi,
Mingshu Bi
Dalian University of Technology, Dalian, China
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Chia-Fon F. Lee
Chia-Fon F. Lee
University of Illinois at Urbana-Champaign, Urbana, IL
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Xiangyu Meng
Dalian University of Technology, Dalian, China
Wuqiang Long
Dalian University of Technology, Dalian, China
Yihui Zhou
Dalian University of Technology, Dalian, China
Mingshu Bi
Dalian University of Technology, Dalian, China
Chia-Fon F. Lee
University of Illinois at Urbana-Champaign, Urbana, IL
Paper No:
ICEF2018-9595, V001T02A003; 10 pages
Published Online:
January 3, 2019
Citation
Meng, X, Long, W, Zhou, Y, Bi, M, & Lee, CF. "Effects of N-Butanol Content on the Dual-Fuel Combustion Mode With CNG at Two Engine Speeds." Proceedings of the ASME 2018 Internal Combustion Engine Division Fall Technical Conference. Volume 1: Large Bore Engines; Fuels; Advanced Combustion. San Diego, California, USA. November 4–7, 2018. V001T02A003. ASME. https://doi.org/10.1115/ICEF2018-9595
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