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

Improving the Performance of a Biogas Powered Dual Fuel Diesel Engine Using Emulsified Rice Bran Biodiesel as Pilot Fuel Through Adjustment of Compression Ratio and Injection Timing

[+] Author and Article Information
Bhaskor J. Bora

Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati-781039, India
e-mail: bhaskor@iitg.ernet.in

Ujjwal K. Saha

Professor
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati-781039, India
e-mail: saha@iitg.ernet.in

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 16, 2014; final manuscript received January 22, 2015; published online February 25, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(9), 091505 (Sep 01, 2015) (14 pages) Paper No: GTP-14-1624; doi: 10.1115/1.4029708 History: Received November 16, 2014; Revised January 22, 2015; Online February 25, 2015

Emulsification is one of the proven techniques to control the pollutants of the diesel engines. The present work attempts to explore the effect of injection timing (IT) of pilot fuel and compression ratio (CR) for an emulsified rice bran biodiesel (RBB)–biogas powered dual fuel diesel engine. A two-phase stable water emulsion of rice bran methyl ester has been prepared by optimizing the factors such as water content (5% and 10%), surfactants (3%), and hydrophilic lipophilic balance (HLB) values (4.3, 5, and 6). The stability of the emulsions is determined on the basis of measurement of mean droplet diameter and stability test. For experimentation, a 3.5 kW single cylinder, direct injection (DI), water cooled, variable CR diesel engine is converted into a biogas run dual fuel diesel engine by connecting a venturi gas mixer at the inlet manifold. A set of combinations comprising CRs of 18, 17.5, and 17, and ITs of 23 deg, 26 deg, 29 deg, and 32 deg before top dead centers (BTDC) at different loading conditions are considered. The investigation demonstrates a maximum brake thermal efficiency (BTE) of 23.62% along with a liquid fuel replacement of 82.22% at pilot fuel IT of 29 deg BTDC and CR of 18. For the same combination, CO and HC emissions are found to be least in all the test cases.

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Figures

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Fig. 1

Images of droplet for different compositions of WIR emulsion: (a) HLB 4.3, 5% water, (b) HLB 4.3, 10% water, (c) HLB 5, 5% water, (d) HLB 5, 10% water, (e) HLB 6, 5% water, and (f) HLB 6, 10% water

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Fig. 2

Assessment of mean droplet diameter for different compositions of WIR emulsion

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Fig. 3

Variation of stability with time for different compositions of WIR emulsion

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Fig. 5

Variation of BTE with load for different CRs and ITs

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Fig. 6

Variation of EGT with load for different CRs and ITs

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Fig. 7

Variation of BFR and LFR with load for different CRs and ITs

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Fig. 8

Variation of ID with load for different CRs and ITs

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Fig. 9

Variation of HRR with crank angle for different CRs and ITs at 100% load

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Fig. 10

Variation of PCP with crank angle for different CRs and ITs at 100% load

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Fig. 11

Variation of PCP with load for different CRs and ITs

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Fig. 12

Variation of NOx with load for different CRs and ITs

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Fig. 13

Variation of CO2 with load for different CRs and ITs

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Fig. 14

Variation of CO with load for different CRs and ITs

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Fig. 15

Variation of HC with load for different CRs and ITs

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