不同密度准东高铁煤熔融特性  

Melting characteristics of Zhundong iron-rich coal with different densities components

作　　者：陈丽娟[1] 王世海 魏博[1] 刘啸天 刘坤朋 王建江 李显[2] 程泽宁 CHEN Lijuan;WANG Shihai;WEI Bo;LIU Xiaotian;LIU Kunpeng;WANG Jianjiang;LI Xian;CHENG Zening(School of Chemical Engineering and Technology,Xinjiang University,Urumqi830017,China;State Key Laboratory of Coal Combustion and Low Carbon Utilization,Huazhong University of Science and Technology,Wuhan430074,China;Zhundong Energy Research Institute,Xinjiang Yianchi Energy Co.,Ltd.,Changji831100,China)

机构地区：[1]新疆大学化工学院,新疆维吾尔自治区乌鲁木齐830017 [2]华中科技大学煤燃烧与低碳利用国家重点实验室,湖北武汉430074 [3]新疆天池能源有限责任公司准东能源研究院,新疆维吾尔自治区昌吉831100

出　　处：《洁净煤技术》2024年第6期1-6,共6页Clean Coal Technology

基　　金：国家自然科学基金面上资助项目(22178298);煤燃烧国家重点实验室基金资助项目(FSKLCCA2201);庭州青年计划资助项目(2021QN08)。

摘　　要：研究不同密度准东高铁煤灰熔融特性,可探究准东高铁煤灰不均匀熔融规律。用有机重液浮沉法分离准东高铁煤不同密度组分,测定各煤样低温灰化后矿物组成及煤灰化学组成、熔融温度,经XRD和SEM-EDS分析熔融灰矿物组成、微观形貌和元素分布。发现准东高铁煤分离出不同密度组分主要分布于1.40~1.50 g/cm^(3),占51.79%,煤中铁赋存形态主要为硫铁矿及少量菱铁矿;煤灰中元素不同,分离出组分密度也不同,且随Fe元素含量增加煤样组分密度增大,在密度组分>1.50 g/cm^(3)的制备煤灰中Fe元素质量分数达67.50%;各组分灰成分差异大,煤中Fe是影响熔点主要因素之一,可显著降低整体煤灰熔融温度;结合高温灰样XRD与SEM-EDS分析,不同密度组分中钙铝黄长石含量增加是导致灰熔融温度增加的原因;Fe、Mg主要富集于轮廓较明显块状灰颗粒,Si和Ca主要富集于熔融区域,且随密度增大块状颗粒含量增多;块状灰颗粒矿物主要为镁铁氧化物和赤铁矿,熔融区域矿物主要为钙铝黄长石,在1300℃煤灰中熔融区域与块状颗粒并未熔合,可知高铁煤中Fe主要存在于煤中外来矿物,且含钠矿物与钙铝黄长石发生低温共熔,熔融区域熔点降低。Melting characteristics of different densities of Zhundong high-iron coal were studied and the uneven melting law of Zhundong high-iron coal was explored.The organic heavy liquid floatation sedimentation method was used to separate components of different densi-ties from Zhundong high-iron coal.The mineral composition of each coal sample after low-temperature ashing,as well as the chemical composition and melting temperature of coal ash were measured.The ash structure,element distribution and mineral composition were also analyzed using XRD and SEM-EDS.The results show that Zhundong high-iron coal and its density components mainly distributes between 1.40-1.50 g/cm^(3),accounting for 51.79%,and the occurrence forms of iron in coal are mainly pyrite and a small amount of siderite.The change of elements in the coal ash leads to the change of the density of the separated components.With the increase of the elemental con-tent of Fe,the density of the coal sample components increases,and in the prepared coal ash.With the density component exceeding 1.50 g/cm^(3),the elemental content of Fe reaches 67.50%.The ash composition of each density component varies greatly and Fe in the coal is one of the main factors affecting the melting point,which can significantly reduce the melting temperature of the overall coal ash.Combi-ning XRD and SEM-EDS analysis of high-temperature ash samples,the increase of Gehlenite content in different density components is the reason for the increase of ash melting point.Fe and Mg are mainly enriched in block shaped ash particles with clear contours,while Si and Ca are mainly enriched in the melting zone,and the content of block shaped particles increases with increasing density.It is specula-ted that the minerals of block shaped ash particles are mainly magnesium iron oxides and Hematite,and the minerals in the melting zone are mainly Gehlenite.At 1300℃,the melting zone of coal ash does not melt together with the massive particles,indicating that Fe in high iron coal mainly exists in forei

关 键 词：准东高铁煤 灰熔融特性 不均匀熔融 灰熔融温度 

分 类 号：TQ53[化学工程—煤化学工程] TK114[动力工程及工程热物理—热能工程]