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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

An Investigation of the Combustion Process of a Heavy-Duty Natural Gas-Diesel Dual Fuel Engine

[+] Author and Article Information
Hailin Li

Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: hailin.li@mail.wvu.edu

Shiyu Liu

Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: shiyu.liu2008@yahoo.com

Chetmun Liew

Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: chetmun.liew@cummins.com

Timothy Gatts

Department of Mechanical
and Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: timothygatts@gmail.com

Scott Wayne

Department of Mechanical
and Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: scott.wayne@mail.wvu.edu

Nigel Clark

Department of Mechanical
and Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: nigel.clark@mail.wvu.edu

John Nuszkowski

Department of Mechanical Engineering,
University of North Florida,
Jacksonville, FL 32224
e-mail: john.nuszkowski@unf.edu

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 3, 2017; final manuscript received March 8, 2018; published online May 24, 2018. Assoc. Editor: Eric Petersen.

J. Eng. Gas Turbines Power 140(9), 091502 (May 24, 2018) (10 pages) Paper No: GTP-17-1267; doi: 10.1115/1.4039812 History: Received July 03, 2017; Revised March 08, 2018

This paper investigates the effect of the addition of natural gas (NG) and engine load on the cylinder pressure, combustion process, brake thermal efficiency, and methane combustion efficiency of a heavy-duty NG-diesel dual fuel engine. Significantly increased peak cylinder pressure (PCP) was only observed with the addition of NG at 100% load. The addition of a relatively large amount NG at high load slightly retarded the premixed combustion, significantly increased the peak heat release rate (PHRR) of the diffusion combustion, decreased the combustion duration, and advanced combustion phasing. The accelerated combustion process and increased heat release rate (HRR) at high load were supported by the increased NOx emissions with the addition of over 3% NG (vol.). By comparison, when operated at low load, the addition of a large amount of NG decreased the PHRR of the premixed combustion and slightly increased the PHRR during the late diffusion combustion. Improved brake thermal efficiency was only observed with the addition of a relatively large amount of NG at high load. The improved thermal efficiency was due to a decrease in combustion duration and the shifting of the combustion phasing toward the optimal phasing. The overall combustion efficiency of the dual fuel operation was always lower than diesel-only operation as indicated by the excess emissions of the unburned methane and carbon monoxide from dual fuel engine. This deteriorated the potential of dual fuel engine in further improving the brake thermal efficiency although the combustion duration of dual fuel engine at high load was much shorter than diesel only operation. The addition of NG at low load should be avoided due to the low combustion efficiency of NG and the decreased thermal efficiency. Approaches capable of further improving the in-cylinder combustion efficiency of NG should enable further improvement in the brake thermal efficiency.

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References

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Figures

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Fig. 1

Natural gas contribution to intake energy

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Fig. 2

Variation of equivalence ratio with changes in NG concentration (vol.) in intake mixture

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Fig. 3

Effect of NG addition on cylinder pressure, 100% load

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Fig. 4

Effect of NG addition on heat release process, 100% load

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Fig. 5

Effect of NG addition on mass fraction burned, 100% load

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Fig. 15

Effect of the NG addition and engine load on combustion duration (CA95-CA5)

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Fig. 16

Effect of the NG addition and engine load on the SOC, CA5

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Fig. 17

Effect of the NG addition and engine load on the EOC, CA95

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Fig. 18

Effect of the NG addition and engine load on combustion phasing, CA50

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Fig. 6

Effect of NG addition on cylinder pressure, 90% load

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Fig. 7

Effect of NG addition on heat release process, 90% load

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Fig. 8

Effect of NG addition on mass fraction burned, 90% load

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Fig. 9

Effect of NG addition on cylinder pressure, 70% load

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Fig. 10

Effect of NG addition on heat release process, 70% load [27]

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Fig. 11

Effect of NG addition on mass fraction burned, 70% load

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Fig. 12

Effect of the NG addition and engine load on intake manifold pressure

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Fig. 13

Effect of the NG addition and engine load on the PCP

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Fig. 14

Effect of NG addition and engine load on PPRR at medium to high load

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Fig. 19

Effect of the NG addition and engine load on the PHRR [27]

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Fig. 20

Effect of the NG addition and engine load on NOx emissions

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Fig. 21

Effect of NG addition and engine load on brake thermal efficiency [27]

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Fig. 22

Effect of NG addition and engine load on the overall combustion efficiency of diesel and NG

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Fig. 23

Effect of NG addition and engine load on the combustion efficiency of CH4 [20]

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Fig. 24

Correlation between the brake thermal efficiency with combustion efficiency of NG observed at different load

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