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Research Papers: Fuel Combustion

Diesel-Like Efficiency Using Compressed Natural Gas/Diesel Dual-Fuel Combustion

[+] Author and Article Information
Karthik Nithyanandan

Department of Mechanical
Science and Engineering,
University of Illinois at Urbana-Champaign,
1206 West Green Street,
Urbana, IL 61801
e-mail: nithyan2@illinois.edu

Jiaxiang Zhang

State Key Laboratory of Multiphase
Flow in Power Engineering,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: zhang.eric.52@gmail.com

Yuqiang Li

School of Energy Science and Engineering,
Central South University,
No. 932 South Lushan Road,
Changsha, Hunan 410082, China
e-mail: csulyq@gmail.com

Xiangyu Meng

Institute of Internal Combustion Engines,
Dalian University of Technology,
No. 2 Linggong Road,
Ganjingzi District,
Dalian, Liaoning 116024, China
e-mail: 200572035@163.com

Robert Donahue

Department of Mechanical
Science and Engineering,
University of Illinois at Urbana-Champaign,
1206 West Green Street,
Urbana, IL 61801
e-mail: donahue9@illinois.edu

Chia-Fon Lee

Department of Mechanical
Science and Engineering,
University of Illinois at Urbana-Champaign,
1206 West Green Street,
Urbana, IL 61801
e-mail: cflee@illinois.edu

Huili Dou

China FAW Co.,
No. 3025, Dongfeng Street,
Changchun, Jilin 130011, China
e-mail: huilid69@sina.com

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 5, 2016; final manuscript received January 7, 2016; published online February 22, 2016. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 138(5), 052201 (Feb 22, 2016) (9 pages) Paper No: JERT-16-1010; doi: 10.1115/1.4032621 History: Received January 05, 2016; Revised January 07, 2016

The use of natural gas in compression ignition (CI) engines as a supplement to diesel under dual-fuel combustion mode is a promising technique to increase efficiency and reduce emissions. In this study, the effect of dual-fuel operating mode on combustion characteristics, engine performance and pollutant emissions of a diesel engine using natural gas as primary fuel and neat diesel as pilot fuel, has been examined. Natural gas (99% methane) was port injected into an AVL 5402 single cylinder diesel research engine under various engine operating conditions and up to 90% substitution was achieved. In addition, neat diesel was also tested as a baseline for comparison. The experiments were conducted at three different speeds—1200, 1500, and 2000 rpm, and at different diesel-equivalent loads (injection quantity)—15, 20 (7 bar IMEP), and 25 mg/cycle. Both performance and emissions data are presented and discussed. The performance was evaluated through measurements of in-cylinder pressure, power output and various exhaust emissions including unburned hydrocarbons (UHCs), carbon monoxide (CO), nitrogen oxides (NOx), and soot. The goal of these experiments was to maximize the efficiency. This was done as follows—the compressed natural gas (CNG) substitution rate (based on energy) was increased from 30% to 90% at fixed engine conditions, to identify the optimum CNG substitution rate. Then using that rate, a main injection timing sweep was performed. Under these optimized conditions, combustion behavior was also compared between single, double, and triple injections. Finally, a load and speed sweep at the optimum CNG rate and timings were performed. It was found that a 70% CNG substitution provided the highest indicated thermal efficiency (ITE). It appears that dual-fuel combustion has a maximum brake torque (MBT) diesel injection timing for different conditions which provides the highest torque. Based on multiple diesel injection tests, it was found that the conditions that favor pure diesel combustion, also favor dual-fuel combustion because better diesel combustion provides better ignition and combustion for the CNG-air mixture. For 70% CNG dual-fuel combustion, multiple diesel injections showed an increase in the efficiency. Based on the experiments conducted, diesel-CNG dual-fuel combustion is able to achieve similar efficiency and reduced emissions relative to pure diesel combustion. As such, CNG can be effectively used to substitute for diesel fuel in CI engines.

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Figures

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Fig. 1

Experimental setup

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Fig. 2

CNG substitution sweep—1200 rpm, 20 mg/cycle baseline at 4 BTDC inj. timing: (a) pressure and (b) HRR

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Fig. 3

CNG substitution sweep—1200 rpm, 20 mg/cycle baseline at 4 BTDC inj. Timing—(a) ITE, NOx, and FSN; (b) HC, CO, EGT

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Fig. 4

CNG70 main timing sweep—1200 rpm, 20 mg/cycle baseline

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Fig. 5

CNG70—1200 rpm, 20 mg/cycle baseline—performance and emissions

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Fig. 6

CNG70 pilot timing sweep (pilot 33%)—1200 rpm, 20 mg/cycle baseline, 4 BTDC main

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Fig. 7

CNG70—pilot (33%) sweep—1200 rpm, 20 mg/cycle baseline—performance and emissions

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Fig. 8

70% CNG—multiple injection comparison—performance and emissions

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Fig. 9

CNG70 load sweep—1200 rpm, 4 BTDC main

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Fig. 10

CNG70 load sweep—performance and emissions

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Fig. 11

CNG70 speed sweep—20 mg/cycle, 4 BTDC main

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Fig. 12

CNG70 speed sweep (at 4 BTDC)—performance and emissions

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Fig. 13

CNG70 speed sweep (at 10 BTDC)—performance and emissions

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