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research-article

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, Ontario, Canada K1A 0R6
Hongsheng.guo@nrc-cnrc.ca.ca

Brian Liko

Energy, Mining and Environment Research Center National Research Council Canada 1200 Montreal Road, Ottawa, Ontario, Canada K1A 0R6
brian.liko@nrc-cnrc.gc.ca

Luis Luque

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

Jennifer Littlejohns

Energy, Mining and Environment Research Center National Research Council Canada 1200 Montreal Road, Ottawa, Ontario, Canada K1A 0R6
JENNIFER.LITTLEJOHNS@NRC-CNRC.GC.CA

1Corresponding author.

ASME doi:10.1115/1.4039758 History: Received February 19, 2018; Revised February 27, 2018

Abstract

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-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.

National Research Council of Canada
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