大南湖二矿煤灰成分表征燃煤结渣特性试验研究  

Experimental research on slagging characteristics of coal combustion by coal ash composition from Dananhu No.2 Mine

作　　者：杨益 陈珣 王敦敦 姚斌 YANG Yi;CHEN Xun;WANG Dundun;YAO Bin(State Grid Hunan Electric Power Corporation Research Institute,Changsha 410007,China;State Key Laboratory of Coal Combustion,Wuhan 430074,China)

机构地区：[1]国网湖南省电力有限公司电力科学研究院,湖南长沙410007 [2]煤燃烧国家重点实验室,湖北武汉430074

出　　处：《煤炭科学技术》2018年第11期227-231,共5页Coal Science and Technology

基　　金："十二五"国家科技支撑计划资助项目(2015BAA04B02)

摘　　要：针对灰熔融温度无法准确预测大南湖二矿原煤实际结渣的问题,利用微波消解法对大南湖二矿原煤和按GB/T 212—2008《煤的工业分析方法》制得的灰(称为国标灰)进行分析,得到其金属元素含量。试验结果显示:在国标法制灰过程中,煤中的主要金属元素均有不同程度的逃逸,用金属氧化物逃逸率表征金属元素的逃逸特性,熔点比较高的K_2O和Al_2O_3的逃逸率高达47.92%和42.48%,熔点比较低的CaO的逃逸率达到36.50%,Fe_2O_3逃逸率最小,但也达到10.60%,导致国标法制灰灰熔融温度升高,与煤实际的结渣特性耦合性差。灰化温度从国标要求的815℃降低到500℃后制得灰样的软化温度为1 200℃,比国标法制得灰样的软化温度低70℃。因此,与灰熔融温度相比,灰成分综合预测指数更能体现大南湖二矿煤实际燃烧的结渣特性。Due to the melting temperature of Dananhu No.2 Mine coal could not accurately predict its slagging characteristics,the content of metal elements were obtained with microwave digestion technology for raw coal and its ash prepared with GB/T 212—2008 Proximate Analysis of Coal.The results reveal that in the process of preparing ash by using GB/T 212—2008 standard,the main metal elements in the coal escape to various degrees. Metal oxide escape rate can explain the metal elements escape characteristics,the escape rate of K2 O and Al2O3 with high melting points are 47.92% and 42.48%,the escape rate of Ca O with relatively low melting point is 36.50%,and the escape rate of Fe2O3 is the smallest,but also reach to 10.60%. The ash melting point is affected enormously by the escape of metal elements,which offends against the actual of coal slagging characteristic.The escape of metal elements enormously influences the ash melting point,resulting in a 70 ℃ difference between the softening temperature of 1 200 ℃ of the ash made under 500 ℃ and that of 1 270 ℃ of the ash made under 815 ℃ by the standard method. Therefore,compared to ash melting temperature,ash composition comprehensive prediction index can be more exactly described the practical slagging characteristics of Dananhu No.2 Mine coal.

关 键 词：灰熔融温度 结渣特性 碱金属 灰成分综合预测指数 高钠煤 

分 类 号：TK16[动力工程及工程热物理—热能工程]