In-situ study on CO/CO2/H2/CH4 emissions during high temperature oxidative pyrolysis of coal via tetrahydrofuran extraction

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Guolan Dou , Liying Zhang , Deming Wang , Xiaoxing Zhong , Botao Qin
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Abstract

The study examined the oxidative pyrolysis of raw and residual coals extracted with tetrahydrofuran, as well as the CO/CO2/H2/CH4 emissions at high temperatures (200∼900 °C). Tetrahydrofuran was found to extract aromatic and aliphatic hydrocarbons from lower metamorphic coal, as well as hydroxyl, increasing the specific surface area of char formed by oxidative pyrolysis of residual coal. The CO2/CO ratio was temperature dependent, and the increase period was fit by a polynomial and a linear function, with critical temperature of around 570 °C. The greater CO2/CO ratio of raw coal suggested that oxidative pyrolysis produced more CO2. The kinetic analysis showed that the change in activation energy is inconsistent with the gas production, and the gases were found to be proportionate to the specific surface area of the coal chars, implying that the char structure has a significant influence on gaseous product emissions and the coal oxidative pyrolysis at high temperatures is a diffusion-controlled heterogeneous reaction. The findings of this study could be useful for determining the status of coal fire.

四氢呋喃萃取法高温氧化热解煤炭过程中 CO/CO2/H2/CH4 排放的现场研究
该研究考察了用四氢呋喃萃取的原煤和残煤的氧化热解,以及高温(200∼900 °C)下的 CO/CO2/H2/CH4 排放情况。研究发现,四氢呋喃能萃取下变质煤中的芳香烃和脂肪烃,还能萃取羟基,增加残煤氧化热解形成的炭的比表面积。CO2/CO 比值与温度有关,上升期由多项式和线性函数拟合,临界温度约为 570 ℃。原煤的 CO2/CO 比值越大,说明氧化热解产生的 CO2 越多。动力学分析表明,活化能的变化与气体产生量不一致,并且发现气体与煤炭的比表面积成正比,这意味着炭的结构对气体产物的排放有重要影响,高温下的煤氧化热解是一种扩散控制的异质反应。这项研究的结果有助于确定煤的燃烧状态。
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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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