热重法研究逐级脱矿对褐煤燃烧特性的影响

doi:10.16085/j.issn.1000-6613.2017.03.018

化工进展 ›› 2017, Vol. 36 ›› Issue (03): 900-908.DOI: 10.16085/j.issn.1000-6613.2017.03.018

热重法研究逐级脱矿对褐煤燃烧特性的影响

侯康, 武建军, 尚晓玲, 张一昕

中国矿业大学化工学院, 煤炭加工与高效洁净利用教育部重点实验室, 国家煤加工与洁净化工程技术研究中心, 江苏徐州 221116

收稿日期:2016-08-31 修回日期:2016-12-08 出版日期:2017-03-05 发布日期:2017-03-05
通讯作者: 武建军,教授,博士生导师,研究方向为褐煤提质利用、型焦、洁净煤技术。
作者简介:侯康(1993-),男,硕士研究生,从事低阶煤清洁利用、煤制气化焦研究。E-mail:houkang0105@126.com。
基金资助:
国家重点基础研究发展计划（2012CB214902）及国家重点研发计划（2016YFB0600401-02）项目。

Experimental study on effects of stepwise removal of minerals on the combustion characteristics of lignites by TG/DTG

HOU Kang, WU Jianjun, SHANG Xiaoling, ZHANG Yixin

Key Laboratory of Coal Processing and Efficient Utilization in Ministry of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, China National Engineering Research Center of Coal Preparation and Purification, Xuzhou 221116, Jiangsu, China

Received:2016-08-31 Revised:2016-12-08 Online:2017-03-05 Published:2017-03-05

摘要/Abstract

摘要：

以胜利褐煤和昭通褐煤为研究对象，采用H₂O、HCl/CH₃COONH₄及CH₃COONH₄/HCl/HF对褐煤进行逐级脱矿处理，利用XRF、XRD和SEM对褐煤中的矿物质种类、含量及其形貌进行分析，采用热重法对比分析了脱矿前后煤样的燃烧特性及动力学反应过程，分析了矿物质对褐煤燃烧特性的影响。结果表明：两种褐煤中的主要矿物元素为Si、Al、Fe、S及碱/碱土金属元素，主要矿物组成为石英、高岭石、云母、石膏、方解石和黄铁矿；3种脱矿方式的矿物质脱除率分别为：胜利褐煤1.22%、32.49%、97.90%，昭通褐煤0.47%、26.41%、94.79%；原煤及脱矿煤的综合燃烧指数S的大小顺序为：原煤 < HCl/CH₃COONH₄脱矿煤 < H₂O脱矿煤 < CH₃COONH₄/HCl/HF脱矿煤，胜利及昭通褐煤呈现相同的规律。三级脱矿处理显著改善了煤的综合燃烧性能。煤中以羧酸盐形式、配位键形式存在于含氧或含氮官能团上的碱及碱土金属对煤的燃烧存在促进作用。煤中水溶性矿物质对燃烧具有抑制作用。褐煤燃烧从着火温度到燃尽温度这一温度区间满足一级反应方程，且线性相关性系数R均在0.985以上。

关键词: 褐煤, 矿物质, 热重分析法, 燃烧特性, 动力学分析

Abstract:

In this work,the two typical Chinese low rank coals,Shengli lignite and Zhaotong lignite were demineralized by H₂O,HCl/CH₃COONH₄,CH₃COONH₄/HCl/HF solution step by step. The elemental composition and surface structures were tested using XRF,XRD and SEM,respectively. The combustion characteristics and the kinetics of the reaction process of raw lignite and treated lignite were investigated by thermogravimetry(TG). The results showed that the coal ash mainly consisted of silicon,aluminium,ferrum,sulphur and the alkali/alkaline earth metal sodium(AAEMs). There are mainly six types of minerals existing in two lignite,including quartz,kaolinite,muscovite,gypsum, calcite and pyrite. The three removal rates of minerals of Shengli and Zhaotong lignite were as follows:1.22%,32.49%,97.90% and 0.47%,26.41% and 94.79%,respectively. The combustion comprehensive index(S) followed in the order:row lignite < removed by HCl/CH₃COONH₄ washing < removed by water washing < removed by CH₃COONH₄/HCl/HF washing. Shengli and Zhaotong lignite had the same variation trend. S of treated lignite was significantly improved by third grade demineralization. AAEMs bound in oxygen-containing or nitrogen-containing functional groups and acid exchange carboxylate can promote the coal combustion characteristics to a certain extent. Water soluble mineral matter inhibited the combustion of coal. Lignite combustion reaction zone meet the first order reaction from the ignition temperature to the burn out temperature,and the value of the linear correlation coefficient _R was more than 0.985.

Key words: lignite, mineral matter, thermogravimetry, combustion characteristics, kinetic analysis

中图分类号:

TQ534

侯康, 武建军, 尚晓玲, 张一昕. 热重法研究逐级脱矿对褐煤燃烧特性的影响[J]. 化工进展, 2017, 36(03): 900-908.

HOU Kang, WU Jianjun, SHANG Xiaoling, ZHANG Yixin. Experimental study on effects of stepwise removal of minerals on the combustion characteristics of lignites by TG/DTG[J]. Chemical Industry and Engineering Progress, 2017, 36(03): 900-908.

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热重法研究逐级脱矿对褐煤燃烧特性的影响

Experimental study on effects of stepwise removal of minerals on the combustion characteristics of lignites by TG/DTG

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