化工进展2017，Vol.36Issue(3)：900-908,9.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
Experimental study on effects of stepwise removal of minerals on the combustion characteristics of lignites by TG/DTG
摘要
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 byCH3COONH4/HCl/HF washing.Shengli and Zhaotong lignite had the same variation trend.Sof 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 coefficientRwas more than 0.985.关键词
褐煤/矿物质/热重分析法/燃烧特性/动力学分析Key words
lignite/mineral matter/thermogravimetry/combustion characteristics/kinetic analysis分类
化学化工引用本文复制引用
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(3):900-908,9.基金项目
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. （2012CB214902）
