[1]马 腾,陈晓坤,翟小伟,等.基于官能团演化特性的煤氧化动力学研究[J].西安科技大学学报,2020,(01):71-77.
 MA Teng,CHEN Xiao-kun,ZHAI Xiao-wei,et al.Kinetic analysis of coal oxidation based on evolution characteristics of functional groups[J].Journal of Xi'an University of Science and Technology,2020,(01):71-77.
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基于官能团演化特性的煤氧化动力学研究(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2020年01期
页码:
71-77
栏目:
出版日期:
2020-02-15

文章信息/Info

Title:
Kinetic analysis of coal oxidation based on evolution characteristics of functional groups
文章编号:
1672-9315(2020)01-0071-07
作者:
马 腾12陈晓坤12翟小伟12白亚娥3雷昌奎12宋波波12
(1.西安科技大学 安全科学与工程学院,陕西 西安 710054; 2.西安科技大学 陕西省煤火灾害防治重点实验室, 陕西 西安 710054; 3.神木职业技术学院 矿业工程系,陕西 神木 719300)
Author(s):
MA Teng12CHEN Xiao-kun12ZHAI Xiao-wei12BAI Ya-e3LEI Chang-kui12SONG Bo-bo12
(1.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Shaanxi Key Laboratory of Prevention and Control of Coal Fire,Xi'an 710054,China; 3.Department of Mining Engineering,Shenmu Vocational and Technical College,Shenmu 719300,China)
关键词:
安全科学与工程 煤自燃 动力学 官能团 阶段性
Keywords:
safety science and engineering coal spontaneous combustion reaction kinetics functional groups stage characteristics
分类号:
TD 752.2
文献标志码:
A
摘要:
为了深入研究煤自燃微观结构的动力学特征,利用同步热分析和原位傅里叶变换红外光谱技术测试顾北烟煤氧化过程中重量与官能团随温度的变化规律。通过Achar微分法与Coast-Redfern积分法相结合对官能团进行动力学计算,并采用Bagchi法推断了最概然机理函数。结果表明:煤氧升温过程呈阶段性变化规律,分为低温失重阶段、吸氧增重阶段、慢化学反应阶段、燃烧阶段和燃尽阶段。煤结构中主要官能团—OH,C= O,—CH2,C—H与C= C键在各阶段体现出不同氧化特性,在低温失重阶段—OH,—CH2与C—H键参与反应所需要的活化能与遵循动力学模型不同,而C= O与C= C键结构稳定不易参与反应,从吸氧增重阶段至燃烧阶段,官能团逐渐被激活与氧气发生反应,燃尽阶段官能团基本耗尽。官能团动力学计算结果揭示了煤自燃是各类官能团遵循不同的动力学模型逐步活化的过程。
Abstract:
In order to examine the dynamic characteristics of coal spontaneous combustion,thermogravimetry and in-situ Fourier Transform Infrared Spectroscopy were used to study the weight and development process of major functional groups during the oxidation heating process of Gubei bituminous coal.The kinetic calculation of the functional group was carried out by Achar differential method combined with the Coast-Redfern integration method.The most probable mechanism function was inferred by the Bagchi method.The results indicate that the stage change of coal oxygen heating process can be divided into five stages:low temperature weightlessness stage,oxygen absorption stage,slow chemical reaction stage,combustion stage and burnout stage.The functional groups —OH,C= O,—CH2,C—H and C= C bonds in the coal structure exhibit different oxidation characteristics at various stages.The —OH,—CH2 and C—H bonds follow different kinetic models and require different activation energies during the low temperature weightlessness stage.However,the structural stability of C= O and C= C bonds is not easy to participate in the reaction.From the stage of oxygen absorption and of weight gain to the combustion stage,various functional groups are gradually activated,which react with oxygen.The functional groups are almost exhausted at the burnout stage.The kinetic calculation results show that coal spontaneous combustion is a process in which various functional groups follow the kinetic model to be activated gradually.

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备注/Memo

备注/Memo:
收稿日期:2019-07-23 责任编辑:杨泉林
基金项目:国家科技支撑计划(2011BAG07B00)
通信作者:王元庆(1968-),男,陕西吴起人,博士,教授,E-mail:wyq21@vip.sina.com
更新日期/Last Update: 2020-02-15