Technical Brief

Hydroxyl and Nitric Oxide Distribution in Waste Rice Bran Biofuel-Octanol Flames

[+] Author and Article Information
Nelfa Desmira, Kuniyuki Kitagawa

Division of Energy Science,
EcoTopia Science Institute,
Nagoya University,
Nagoya 464-8603, Japan

Ashwani K. Gupta

Distinguished University Professor
Department of Mechanical Engineering,
University of Maryland,
College Park, MD 20742
e-mail: akgupta@umd.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 26, 2013; final manuscript received June 12, 2013; published online August 19, 2013. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 136(1), 014501 (Aug 19, 2013) (5 pages) Paper No: JERT-13-1096; doi: 10.1115/1.4024860 History: Received March 26, 2013; Revised June 12, 2013

Two-dimensional (2-D) visualization of hydroxyl (OH) radical in combustion of biofuel made of waste rice bran oil (called W) mixed with octanol (called O) at different mixture ratios were examined in a laboratory scale facility using planar laser-induced fluorescence (PLIF) diagnostics. Rice bran oil has a composition similar to that of peanut oil, with 38% monounsaturated, 37% polyunsaturated, and 25% saturated fatty acids. The ratio of this biofuel to octanol fuel examined was W90/O10, W75/O25, and W60/O40. The chemical species generated from within the combustion zone were analyzed from the spontaneous emission spectra of the flame in the ultraviolet to visible (Uv-Vis) range. The spatial distribution of Nitric Oxide (NO) and OH, denoted as OH*, were identified from the spectra. Two-dimensional (2-D) distributions of flame temperature were obtained using a thermal video camera. The experimental results showed the temperatures to range from 600 °C to 1400 °C. The highest temperature was obtained using W60/O40 waste/octanol fuel mixture. A practical burner commonly used in Indonesia, called semawar, that have a built-in preheating system was used for the combustion of biofuels.

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Fig. 5

OH intensity fluctuation in biofuel flames at 0.1 s ∼ 0.9 s

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Fig. 6

2-D mean temperature and RSD profiles for W90/O10, W75/O25, and W60/O40 biofuelled flames

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Fig. 4

One-dimensional distribution in r-direction for OH and OH* from the biofuelled flames

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Fig. 3

2-D OH radical distribution OH-PLIF (b) OH* spontaneous emission

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Fig. 2

OH radical excitation using PLIF diagnostics (spectroscopy intensifier exposure time: 0.2 s, gain: 82)

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Fig. 1

Schematic diagram of the measurement system

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Fig. 7

Evolutionary behavior of 2-D temperature distribution in W90/O10, W75/O25, and W60/O40 biofuelled flames

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Fig. 8

NO spontaneous emission inW90/O10, W75/O25, and W60/O40 biofuelled flames



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