Natural gas/diesel dual fuel engines used in oil and gas drilling operations must be able to meet NOx emissions limits across a wide range of substitution percentage, which affects the air to natural gas ratio or gas lambda. In a dual fuel engine operating at high substitution, premixed, propagating natural gas flames occur and the NOx formed in such premixed flames is known to be a strong function of gas lambda. Consequently there is interest in understanding how NOx formation in a dual fuel engine is affected by gas lambda. However, NOx formation in a dual fuel engine is complicated by the interaction with the non-premixed diesel jet flame. As a result, previous studies have shown that enriching the air-fuel ratio can either increase or decrease NOx emissions depending on the operating conditions investigated. This study presents multi-dimensional combustion simulations of an air-fuel ratio sweep from gas lambda 2.0 to 1.5 at 80% substitution, which exhibited a minimum in NOx emissions at a natural gas lambda of 1.75. Images from the simulations are used to provide detailed explanations of the physical processes responsible for the minimum NOx trend with natural gas lambda.
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ASME 2017 Internal Combustion Engine Division Fall Technical Conference
October 15–18, 2017
Seattle, Washington, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5831-8
PROCEEDINGS PAPER
Using Multi-Dimensional Combustion Simulations of a Natural Gas/Diesel Dual Fuel Engine to Investigate NOx Trends With Air-Fuel Ratio
Andrew Hockett,
Andrew Hockett
Hiltner Combustion Systems, Ferndale, WA
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Michael Flory,
Michael Flory
Hiltner Combustion Systems, Ferndale, WA
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Joel Hiltner,
Joel Hiltner
Hiltner Combustion Systems, Ferndale, WA
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Scott Fiveland
Scott Fiveland
Caterpillar Inc., Peoria, IL
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Andrew Hockett
Hiltner Combustion Systems, Ferndale, WA
Michael Flory
Hiltner Combustion Systems, Ferndale, WA
Joel Hiltner
Hiltner Combustion Systems, Ferndale, WA
Scott Fiveland
Caterpillar Inc., Peoria, IL
Paper No:
ICEF2017-3642, V001T01A009; 9 pages
Published Online:
November 30, 2017
Citation
Hockett, A, Flory, M, Hiltner, J, & Fiveland, S. "Using Multi-Dimensional Combustion Simulations of a Natural Gas/Diesel Dual Fuel Engine to Investigate NOx Trends With Air-Fuel Ratio." Proceedings of the ASME 2017 Internal Combustion Engine Division Fall Technical Conference. Volume 1: Large Bore Engines; Fuels; Advanced Combustion. Seattle, Washington, USA. October 15–18, 2017. V001T01A009. ASME. https://doi.org/10.1115/ICEF2017-3642
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