Thermogravimetric Analysis of Coal Char Combustion Kinetics

Four chars prepared from pulverized coals were subjected to non-isothermal and isothermal combustion tests in a thermogravimetric analysis （TGA） device. Three different test methods, i. e. , non-isothermal single heat- ing rate （A）, non-isothermal multiple heating rate （B）, and isothermal test （C）,...

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Published inJournal of iron and steel research, international Vol. 21; no. 10; pp. 897 - 904
Main Authors WANG, Guang-wei, ZHANG, Jian-liang, SHAO, Jiu-gang, SUN, Hui, ZUO, Hai-bin
Format Journal Article
LanguageEnglish
Published Singapore Elsevier Ltd 01.10.2014
Springer Singapore
Subjects
Applied and Technical Physics
coal char
combustion
Engineering
kinetics
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
Processes
thermogravimetric analysis
加热速率
动力学控制
热重分析
煤焦
燃烧动力学
燃烧温度
燃烧特性
燃烧试验
thermogravimetric analysis
combustion
kinetics
coal char
Online AccessGet full text
ISSN1006-706X
2210-3988
DOI10.1016/S1006-706X(14)60159-X

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Summary:Four chars prepared from pulverized coals were subjected to non-isothermal and isothermal combustion tests in a thermogravimetric analysis （TGA） device. Three different test methods, i. e. , non-isothermal single heat- ing rate （A）, non-isothermal multiple heating rate （B）, and isothermal test （C）, were conducted to calculate the ki- netic parameters of combustion of coal char. The results show that the combustion characteristics of bituminous coal char is better than that of anthracite char, and both increase of heating rate and increase of combustion temperature can obviously improve combustion characteristics of coal char. Activation energies of coal char combustion calculated by different methods are different, with activation energies calculated by methods A, B and C in the range of 103.12-- 153.77, 93.87--119.26, and 46.48--76.68 kJ/mol, respectively. By using different methods, activation energy of anthracite char is always higher than that of bituminous coal char. In non-isothermal tests, with increase of combus- tion temperature, the combustion process changed from kinetic control to diffusion control. For isothermal combus- tion, the combustion process was kinetically controlled at temperature lower than 580 ℃ for bituminous coal char and at temperature lower than 630 ℃ for anthracite char.
Bibliography:11-3678/TF
coal char; combustion; thermogravimetric analysis; kinetics
Guang-wei WANG , Jian-liang ZHANG , Jiu-gang SHAO , Hui SUN , Hal-bin ZUO （1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China）
Four chars prepared from pulverized coals were subjected to non-isothermal and isothermal combustion tests in a thermogravimetric analysis （TGA） device. Three different test methods, i. e. , non-isothermal single heat- ing rate （A）, non-isothermal multiple heating rate （B）, and isothermal test （C）, were conducted to calculate the ki- netic parameters of combustion of coal char. The results show that the combustion characteristics of bituminous coal char is better than that of anthracite char, and both increase of heating rate and increase of combustion temperature can obviously improve combustion characteristics of coal char. Activation energies of coal char combustion calculated by different methods are different, with activation energies calculated by methods A, B and C in the range of 103.12-- 153.77, 93.87--119.26, and 46.48--76.68 kJ/mol, respectively. By using different methods, activation energy of anthracite char is always higher than that of bituminous coal char. In non-isothermal tests, with increase of combus- tion temperature, the combustion process changed from kinetic control to diffusion control. For isothermal combus- tion, the combustion process was kinetically controlled at temperature lower than 580 ℃ for bituminous coal char and at temperature lower than 630 ℃ for anthracite char.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(14)60159-X