Atmospheric Oxidation of Coal at Moderate Temperatures

Schmidt, L.D.; Elder, J.L.

doi:10.1021/ie50362a021

Cited by 49 publications

(12 citation statements)

References 4 publications

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“…These results are consistent with other reported results. Schmidt and Elder (1940) reported that the value of the apparent order of the reaction in low-temperature oxidation studies of some U.S. coals is about 0.61. Kaji et al (1985) found that the orders of reaction for CO 2 and CO formation were 0.50 and 0.54, respectively, with respect to O 2 for an Australia coal at 150 °C.…”

Section: Resultsmentioning

confidence: 99%

Experimental study on CO and CO2 emissions from spontaneous heating of coals at varying temperatures and O2 concentrations

Yuan

Smith

2013

Journal of Loss Prevention in the Process Industries

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Laboratory experiments were conducted to investigate carbon monoxide (CO) and carbon dioxide (CO2) emissions from spontaneous heating of three U.S. coal samples in an isothermal oven at temperatures between 50 and 110 °C. The oxygen (O2) concentration of an oxygen/nitrogen (N2) mixture flowing through the coal sample was 3, 5, 10, 15, and 21%, respectively. The temperature at the center of the coal sample was continuously monitored, while the CO, CO2, and O2 concentrations of the exit gas were continuously measured. The results indicate that the CO and CO2 concentrations and the CO/CO2 ratio increased when the initial temperature was increased. As the inlet O2 concentration increased, the CO and CO2 concentrations increased, while the CO/CO2 ratios tended to converge to the same value. The ratio of CO/CO2 was found to be independent of coal properties, approaching a constant value of 0.2. The maximum CO production rate correlated well with the maximum coal temperature rise. The apparent order of reaction for coal oxidation was estimated to be between 0.52 and 0.72. The experimental results in this study could be used for early detection and evaluation of a spontaneous heating in underground coal mines.

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Section: Resultsmentioning

confidence: 99%

Experimental study on CO and CO2 emissions from spontaneous heating of coals at varying temperatures and O2 concentrations

Yuan

Smith

2013

Journal of Loss Prevention in the Process Industries

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“…The value of the apparent order of the reaction, n, in low-temperature oxidation studies of coal and other carbonaceous materials, has been shown to vary from w0.5 to 1.0 (Carras & Young, 1994), and is about 0.61 for some U.S. coals (Schmidt & Elder, 1940). Using this value, the reaction rate becomes…”

Section: Modeling Of Low-temperature Coal Oxidationmentioning

confidence: 99%

CFD modeling of spontaneous heating in a large-scale coal chamber

Yuan

Smith

2009

Journal of Loss Prevention in the Process Industries

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“…The value of the order of reaction, n, for coal and other carbonaceous materials in study of low-temperature oxidation has been proven to differ between 0.5 and 1.0 (Carras & Young, 1994), and for some U.S. coals, it is about 0.61 (Schmidt & Elder, 1940). With this amount, the equation of the rate of reaction will be…”

Section: Modeling Of Low-temperature Coal Oxidationmentioning

confidence: 99%

Modeling of the Crossing Point Temperature Phenomenon in the Low-temperature Oxidation of Coal

Saleh¹,

Muharram²,

Nugroho³

2017

IJTech

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In this study, modeling of the crossing point temperature (CPT) phenomenon in the lowtemperature oxidation of coal was carried out using COMSOL Multiphysics®. Lowtemperature oxidation can lead to spontaneous combustion of coal stockpiles. The CPT phenomenon was modeled with the kinetics data obtained from a prior laboratory experimental study. The coupling of the heat-transfer phenomenon through conduction and convection determined the thermal evolution model. In this case, coal received the initial heat of the oven temperature increases. As the coal temperature rose, the heat generated from oxidation was released into the environment via conduction and convection. Meanwhile, oxidation products and oxygen were transferred by convection and diffusion. The effects of moisture and the humidity were not considered. The outcomes of modeling were validated through comparison with the results of experimental tests, and the modeling result agreed well with the experiment tests, with temperature deviations of about 0.9%. The effects of airflow rate, oxygen concentration, porosity, and the initial temperature on low-temperature coal oxidation were also examined.

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Atmospheric Oxidation of Coal at Moderate Temperatures

Cited by 49 publications

References 4 publications

Experimental study on CO and CO2 emissions from spontaneous heating of coals at varying temperatures and O2 concentrations

Experimental study on CO and CO2 emissions from spontaneous heating of coals at varying temperatures and O2 concentrations

CFD modeling of spontaneous heating in a large-scale coal chamber

Modeling of the Crossing Point Temperature Phenomenon in the Low-temperature Oxidation of Coal

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