The importance of on line measurement of ultrafine particulates in pulverized coal flames is mainly due to the detection of ultrafine particulate in the effluent for pollution control, and the quantification of fuel burnout in real time within a boiler for improved understanding of the flame heat transfer soot modeling as well. A method has been investigated using laser-heated emission within an O2-free flame which provides a continuous in situ measurement of ultrafine particles during high-temperature pulverized coal pyrolysis. Bituminous coal particles are entrained by nitrogen along the centerline of a laminar flow flat flame burner, where a hydrogen-air flame under fuel-rich condition is used as a heat source. The temperatures of the hydrogen flame were measured by a finite-wire silica-coated Platinum-Rhodium type B Thermocouple. Volatiles released during the coal pyrolysis form a cloud of ultrafine particles at high temperature. A pulse laser sheet introduced to the flame heats the ultrafine particles to incandescent temperatures. The time-resolved laser-induced emission signals with different incident laser-pulse fluences were evaluated. The volume faction of ultrafine particles was associated with the peak value of the signals, and the mean particle size characterized by a time constant of the exponential signal decay. A strong dependence of the characteristic peak value and emission time constant during laser-heated particle cooling from the measured coal particle class could be determined. Specialties in signal evaluation due to residence time in the hydrogen flame for two sizes of coal particles are discussed.
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ASME 2011 Power Conference collocated with JSME ICOPE 2011
July 12–14, 2011
Denver, Colorado, USA
Conference Sponsors:
- Power Division
ISBN:
978-0-7918-4460-1
PROCEEDINGS PAPER
Laser-Induced Emission of Ultrafine Particulates Evolved by Pulverized Coal Pyrolysis
Linghong Chen,
Linghong Chen
Zhejiang University, Hangzhou, P.R. China
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Zhenyan Pan,
Zhenyan Pan
Zhejiang University, Hangzhou, P.R. China
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Kefa Cen,
Kefa Cen
Zhejiang University, Hangzhou, P.R. China
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Kunzan Qiu,
Kunzan Qiu
Zhejiang University, Hangzhou, P.R. China
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Gerard Grehan
Gerard Grehan
UMR 6614 / CORIA, Saint Etienne du Rouvray, France
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Linghong Chen
Zhejiang University, Hangzhou, P.R. China
Zhenyan Pan
Zhejiang University, Hangzhou, P.R. China
Kefa Cen
Zhejiang University, Hangzhou, P.R. China
Kunzan Qiu
Zhejiang University, Hangzhou, P.R. China
Gerard Grehan
UMR 6614 / CORIA, Saint Etienne du Rouvray, France
Paper No:
POWER2011-55449, pp. 733-738; 6 pages
Published Online:
February 28, 2012
Citation
Chen, L, Pan, Z, Cen, K, Qiu, K, & Grehan, G. "Laser-Induced Emission of Ultrafine Particulates Evolved by Pulverized Coal Pyrolysis." Proceedings of the ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASME 2011 Power Conference, Volume 2. Denver, Colorado, USA. July 12–14, 2011. pp. 733-738. ASME. https://doi.org/10.1115/POWER2011-55449
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