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Title: EXPERIMENTS AND COMPUTATIONAL MODELING OF PULVERIZED-COAL IGNITION

Abstract

Under typical conditions of pulverized-coal combustion, which is characterized by fine particles heated at very high rates, there is currently a lack of certainty regarding the ignition mechanism of bituminous and lower rank coals as well as the ignition rate of reaction. furthermore, there have been no previous studies aimed at examining these factors under various experimental conditions, such as particle size, oxygen concentration, and heating rate. Finally, there is a need to improve current mathematical models of ignition to realistically and accurately depict the particle-to-particle variations that exist within a coal sample. Such a model is needed to extract useful reaction parameters from ignition studies, and to interpret ignition data in a more meaningful way. The authors propose to examine fundamental aspects of coal ignition through (1) experiments to determine the ignition temperature of various coals by direct measurement, and (2) modeling of the ignition process to derive rate constants and to provide a more insightful interpretation of data from ignition experiments. The authors propose to use a novel laser-based ignition experiment to achieve their first objective. Laser-ignition experiments offer the distinct advantage of easy optical access to the particles because of the absence of a furnace or radiatingmore » walls, and thus permit direct observation and particle temperature measurement. The ignition temperature of different coals under various experimental conditions can therefore be easily determined by direct measurement using two-color pyrometry. The ignition rate-constants, when the ignition occurs heterogeneously, and the particle heating rates will both be determined from analyses based on these measurements.« less

Authors:
;
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
787566
Report Number(s):
FG22-96PC96221-06
TRN: AH200133%%647
DOE Contract Number:  
FG22-96PC96221
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 29 Dec 1999
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; COMBUSTION; FURNACES; HEATING RATE; IGNITION; MATHEMATICAL MODELS; OXYGEN; PARTICLE SIZE; TEMPERATURE MEASUREMENT

Citation Formats

Owusu-Ofori, Samuel, and Chen, John C. EXPERIMENTS AND COMPUTATIONAL MODELING OF PULVERIZED-COAL IGNITION. United States: N. p., 1999. Web. doi:10.2172/787566.
Owusu-Ofori, Samuel, & Chen, John C. EXPERIMENTS AND COMPUTATIONAL MODELING OF PULVERIZED-COAL IGNITION. United States. https://doi.org/10.2172/787566
Owusu-Ofori, Samuel, and Chen, John C. 1999. "EXPERIMENTS AND COMPUTATIONAL MODELING OF PULVERIZED-COAL IGNITION". United States. https://doi.org/10.2172/787566. https://www.osti.gov/servlets/purl/787566.
@article{osti_787566,
title = {EXPERIMENTS AND COMPUTATIONAL MODELING OF PULVERIZED-COAL IGNITION},
author = {Owusu-Ofori, Samuel and Chen, John C},
abstractNote = {Under typical conditions of pulverized-coal combustion, which is characterized by fine particles heated at very high rates, there is currently a lack of certainty regarding the ignition mechanism of bituminous and lower rank coals as well as the ignition rate of reaction. furthermore, there have been no previous studies aimed at examining these factors under various experimental conditions, such as particle size, oxygen concentration, and heating rate. Finally, there is a need to improve current mathematical models of ignition to realistically and accurately depict the particle-to-particle variations that exist within a coal sample. Such a model is needed to extract useful reaction parameters from ignition studies, and to interpret ignition data in a more meaningful way. The authors propose to examine fundamental aspects of coal ignition through (1) experiments to determine the ignition temperature of various coals by direct measurement, and (2) modeling of the ignition process to derive rate constants and to provide a more insightful interpretation of data from ignition experiments. The authors propose to use a novel laser-based ignition experiment to achieve their first objective. Laser-ignition experiments offer the distinct advantage of easy optical access to the particles because of the absence of a furnace or radiating walls, and thus permit direct observation and particle temperature measurement. The ignition temperature of different coals under various experimental conditions can therefore be easily determined by direct measurement using two-color pyrometry. The ignition rate-constants, when the ignition occurs heterogeneously, and the particle heating rates will both be determined from analyses based on these measurements.},
doi = {10.2172/787566},
url = {https://www.osti.gov/biblio/787566}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 29 00:00:00 EST 1999},
month = {Wed Dec 29 00:00:00 EST 1999}
}