Gas switch effect on the isothermal gasification reaction of coal char in thermogravimetric analyser

被引：0

作者：

Zhang Q. ^{[1
]}

Xiang X. ^{[1
]}

Liang L. ^{[1
]}

Liu J. ^{[1
]}

Wang Z. ^{[2
]}

Fang Y. ^{[2
]}

Huang W. ^{[1
]}

机构：

[1] State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan

[2] State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 01期

关键词：

Coal gasification; Gas switch effect; Isothermal reaction; Kinetic analysis; Thermogravimetric analyser;

D O I：

10.16085/j.issn.1000-6613.2021-0238

中图分类号：

学科分类号：

摘要：

Isothermal gasification reaction of coal was often conducted by thermogravimetric analyzer in laboratory, while the gas switch effect in this process was rarely considered. In this paper, a coal char was used to evaluate the effect of the gas switch step on the isothermal gasification experiments by comparing the traditional gas switch process with a newly designed all CO2 process. The on line mass spectrometry was also used to evaluate the reactive gas evolution behavior in these processes. The results showed that for the gasification reaction with the gas switch process, though the CO2 could reach to the reaction zone quickly, the coal char was still reacted in the mixture atmosphere of the CO2 and the initial inert gas for the emission of the inert gas was not an ideal plug flow condition. This greatly affected the gasification rate of the char, further affected the selection of kinetic model, and finally caused the decrease of the calculated activation energy for which was affected by the gas diffusion effect. Therefore, it is suggested that in the study of isothermal gas-solid reactions via thermogravimetric analyser with the gas switch process, the gas evolution behavior should be detected first, and the influence of the gas switch process should be evaluated so as to reduce the errors caused. © 2022, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：166 / 173

页数：7

共 23 条

[1] TIAN Lin, HU Jianhang, LIU Huili, Pyrolysis characteristics and kinetics of oleic acid were analyzed by thermogravimetric and infrared spectroscopy, Chemical Industry and Engineering Progress, 39, pp. 152-161, (2020)
[2] ZHAO Zhenghao, XIANG Wenguo, CHEN Shiyi, Et al., Performance of cobalt modified calcium sorbents for steam gasification of sewage sludge, Chemical Industry and Engineering Progress, 38, 10, pp. 4747-4754, (2019)
[3] BREAULT R W., Gasification processes old and new: a basic review of the major technologies, Energies, 3, 2, pp. 216-240, (2010)
[4] ZHANG Q, LI Q F, ZHANG L X, Et al., Preliminary study on co-gasification behavior of deoiled asphalt with coal and biomass, Applied Energy, 132, pp. 426-434, (2014)
[5] JING X L, WANG Z Q, YU Z L, Et al., Experimental and kinetic investigations of CO2 gasification of fine chars separated from a pilot-scale fluidized-bed gasifier, Energy & Fuels, 27, 5, pp. 2422-2430, (2013)
[6] ZHAN X L, ZHOU Z J, WANG F C., Catalytic effect of black liquor on the gasification reactivity of petroleum coke, Applied Energy, 87, 5, pp. 1710-1715, (2010)
[7] IRFAN M F, USMAN M R, KUSAKABE K., Coal gasification in CO2 atmosphere and its kinetics since 1948: a brief review, Energy, 36, 1, pp. 12-40, (2011)
[8] BHATIA S K, PERLMUTTER D D., A random pore model for fluid-solid reactions: ‍Ⅰ‍‍‍. Isothermal, kinetic control, AIChE Journal, 26, 3, pp. 379-386, (1980)
[9] GOMEZ A, SILBERMANN R, MAHINPEY N., A comprehensive experimental procedure for CO2 coal gasification: is there really a maximum reaction rate?, Applied Energy, 124, pp. 73-81, (2014)
[10] ZENG X, WANG F, WANG Y G, Et al., Characterization of char gasification in a micro fluidized bed reaction analyzer, Energy & Fuels, 28, 3, pp. 1838-1845, (2014)

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