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Technical Briefs

Spectroscopic Observation of Chemical Species From High-Temperature Air Pulverized Coal Combustion

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

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

Takuya Nagasaka

Department of Applied Chemistry,
Graduate School of Engineering,
Nagoya University,
Nagoya 464-8603, Japan

Akira Ishikawa

Chubu Electric Power Co., Inc.,
Nagoya, Aichi, 461-8522, Japan

Ashwani K. Gupta

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 11, 2013; final manuscript received March 12, 2013; published online April 30, 2013. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 135(3), 034503 (Apr 30, 2013) (5 pages) Paper No: JERT-13-1084; doi: 10.1115/1.4024120 History: Received March 11, 2013; Revised March 12, 2013

In situ monitoring of chemical species from the combustion pulverized coal in high-temperature air is examined using several different spectroscopic diagnostic at different equivalence ratios. Two-dimensional (2D) distributions of flame temperature were obtained using a thermal video camera. The experimental results showed the temperatures to range from low to 1400 °C under various conditions of fuel-lean, stoichiometric, and fuel-rich. The highest temperature and flame stability were obtained under fuel-lean combustion condition. The chemical species generated from within the combustion zone were analyzed from the spontaneous emission spectra of the flame in the Ultraviolet–visible (UV-Vis) range. The spatial distribution of NO, OH, and CN were identified from the spectra. The 2D distribution of emission intensity visualized and recorded for NO, OH, and CN revealed high-temperatures close to the root of the flame that rapidly dispersed radially outward to provide very high temperatures over a much larger volume at further downstream locations of the flame.

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Figures

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Fig. 1

A schematic of the pulverized coal experimental facility

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Fig. 2

Measurement locations in the flame

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Fig. 3

Profile of NO, OH, and CN using spectroscopy for fuel-lean, stoichiometric, and fuel-rich pulverized coal flames at 5 mm flame height

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Fig. 4

Spontaneous emission intensity of CN, OH, and NO at the three flame heights

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Fig. 5

A graphic representation on the formation of CN, OH, and NO (both from fuel and thermal NO) from the pulverized coal flames

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Fig. 6

Visualization of CN, OH, and NO emissions using CCD camera for fuel-lean, stoichiometric, and fuel-rich pulverized coal flames

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Fig. 7

Evolutionary behavior of 2D temperature distribution in fuel-lean, stoichiometric, and fuel-rich flames

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Fig. 8

2D mean temperature and RSD profiles for fuel-lean, stoichiometric, and fuel-rich pulverized coal flames

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Fig. 9

Correlation between NO concentration and flame temperature distribution

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Fig. 10

Calibration of NO in pulverized coal flames at φ = 1

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