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Research Papers: Internal Combustion Engines

Combustion Performance and Unburned Hydrocarbon Emissions of a Natural Gas–Diesel Dual Fuel Engine at a Low Load Condition

[+] Author and Article Information
Hongsheng Guo

Energy, Mining and Environment
Research Center,
National Research Council Canada,
1200 Montreal Road,
Ottawa, ON K1A 0R6, Canada
e-mail: Hongsheng.guo@nrc-cnrc.ca.ca

Brian Liko

Energy, Mining and Environment
Research Center,
National Research Council Canada,
1200 Montreal Road,
Ottawa, ON K1A 0R6, Canada
e-mail: Brian.liko@nrc-cnrc.gc.ca

Luis Luque

Energy, Mining and Environment
Research Center,
National Research Council Canada,
1200 Montreal Road,
Ottawa, ON K1A 0R6, Canada
e-mail: Luis.luque@nrc-cnrc.gc.ca

Jennifer Littlejohns

Energy, Mining and Environment
Research Center,
National Research Council Canada,
1200 Montreal Road,
Ottawa, ON K1A 0R6, Canada
e-mail: Jennifer.littlejohns@nrc-cnrc.gc.ca

1Corresponding author.

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 19, 2018; final manuscript received February 27, 2018; published online June 27, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(11), 112801 (Jun 27, 2018) (7 pages) Paper No: GTP-18-1077; doi: 10.1115/1.4039758 History: Received February 19, 2018; Revised February 27, 2018

The combustion of natural gas reduces fuel cost and generates less emissions of carbon dioxide and particulate matter (PM) than diesel and gasoline. Replacing diesel by natural gas in internal combustion engines is of great interest for transportation and stationary power generation. Dual fuel combustion is an efficient way to burn natural gas in internal combustion engines. In natural gas–diesel dual fuel engines, unburned hydrocarbon emissions increase with increasing natural gas fraction. Many studies have been conducted to improve the performance of natural gas–diesel dual fuel engines and reported the performance of combustion and emissions of regulated pollutants and total unburned hydrocarbon at various engine operating strategies. However, little has been reported on the emissions of different unburned hydrocarbon components. In this paper, an experimental investigation was conducted to investigate the combustion performance and emissions of various unburned hydrocarbon components, including methane, ethane, ethylene, acetylene, propylene, formaldehyde, acetaldehyde, and benzaldehyde, at a low engine load condition. The operating conditions, such as engine speed, load, intake temperature, and pressure, were well controlled during the experiment. The combustion and emissions performance of pure diesel and natural gas–diesel dual fuel combustion were compared. The effect of diesel injection timing was analyzed. The results show that appropriately advancing diesel injection timing to form a homogeneous charge compression ignition (HCCI)-like combustion is beneficial to natural gas–diesel dual fuel combustion at low load conditions. The emissions of different unburned hydrocarbon components changed in dual fuel combustion, with emissions of some unburned hydrocarbon components being primarily due to the combustion of natural gas, while those of others being more related to diesel combustion.

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Figures

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Fig. 1

Schematic of experimental setup

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Fig. 2

Variation of combustion phasing

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Fig. 3

Variation of peak pressure rise rate

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Fig. 4

Net heat release rates

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Fig. 5

Variation of ignition delay

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Fig. 6

Brake thermal efficiency

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Fig. 8

CO2 equivalent emissions

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Fig. 11

Ethylene emissions

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Fig. 12

Acetylene emissions

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Fig. 13

Propylene emissions

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Fig. 14

Formaldehyde emissions

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Fig. 15

Acetaldehyde emissions

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Fig. 16

Benzaldehyde emissions

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