大南湖二矿煤灰熔融温度表征结渣特性的试验研究
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摘要
利用微波消解法和GB/T 1574-2007两种不同的方法对大南湖二矿原煤制灰,并对灰样中的金属元素的含量进行对比分析。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℃后制得灰的软化温度ST为1200℃,比国标法制得灰的软化温度低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用的结渣特性。
The ash melting temperature of Dananhu No.2 Mine coal can not be accurately predicted with its slagging characteristics. In this work, the raw coal samples were investigated to prepare its ash by using microwave digestion technology and the GB/T 1574-2007 standard. The results reveal that in the process of preparing ash by using GB/T 1574-2007 standard, all the main metallic elements in the coal escape to various degrees. The escape rate of K_2O and Al_2O_3 with high melting point were 47.92 % and 42.48 %. The escape rate of CaO with relatively low melting point was 36.50 %, and the escape rate of Fe_2O_3 was the smallest, but also reached to 10.60 %. The ash melting point was affected enormously by the escape of metallic elements, which offends against the actual of coal slagging characteristic. The softening temperature of the ash made under 500 ℃ was 1200 ℃. However, the softening temperature of the ash under GB/T 1574-2007 standard was 1270 ℃. Thus, the practical slag characteristics of Dananhu No.2 Mine coal can be more exactly described with ash composition comprehensive prediction index than with ash melting temperature.
The ash melting temperature of Dananhu No.2 Mine coal can not be accurately predicted with its slagging characteristics. In this work, the raw coal samples were investigated to prepare its ash by using microwave digestion technology and the GB/T 1574-2007 standard. The results reveal that in the process of preparing ash by using GB/T 1574-2007 standard, all the main metallic elements in the coal escape to various degrees. The escape rate of K_2O and Al_2O_3 with high melting point were 47.92 % and 42.48 %. The escape rate of CaO with relatively low melting point was 36.50 %, and the escape rate of Fe_2O_3 was the smallest, but also reached to 10.60 %. The ash melting point was affected enormously by the escape of metallic elements, which offends against the actual of coal slagging characteristic. The softening temperature of the ash made under 500 ℃ was 1200 ℃. However, the softening temperature of the ash under GB/T 1574-2007 standard was 1270 ℃. Thus, the practical slag characteristics of Dananhu No.2 Mine coal can be more exactly described with ash composition comprehensive prediction index than with ash melting temperature.
引文
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[11]修洪雨,黄镇宇,张堃等. CaO对煤灰主要成分熔融特性的影响[J].电站系统工程, 2005, 21(2):20-22.
[12]姚星一.煤灰熔点与化学成分的关[J].燃料化学学报, 1965,6(2):151-161.
[13]姚润生,李小红,左永飞等.钠基助熔剂对灵石煤灰熔融特性温度的影响[J].煤炭学报, 2011, 36(6):1027-1031.
[14]戴爱军,杜彦学,谢欣馨.煤灰成分与灰熔融性关系研究进展[J].煤化工, 2009, 32(4):16-19.
[15]康艳红,李光哲,李国德等.煤燃烧过程中金属元素迁移特性[J].电力环境保护, 2009, 25(1):44-46.
[2]李永兴,陈春元.动力用煤结渣特性综合判别指数的研究[J].热力发电, 1994, 8(3):36-39.
[3]周俊虎,赵晓辉,杨卫娟等.神华煤结渣倾向和结渣机制研究[J].中国电机工程学报,2007, 27(8):31-36.
[4]宋汉疆.新疆准东煤田煤炭综合利用问题探讨[J].西部探矿工程, 2008, 5(9):49-51.
[5]杨忠灿,刘家利,何红光.新疆准东煤特性研究及其锅炉选型[J].热力发电, 2010, 39(8):38-40.
[6]杨荣,刘家利.南露天矿煤结渣与沾污特性研究[J].热力发电,2012, 47(10):31-34.
[7]芦涛,张雷,张晔等.煤灰中矿物质组成对煤灰熔融温度的影响[J].燃料化学学报, 2010, 38(1):23-28.
[8]张军,汉春利,刘坤磊等.煤中碱金属及其在燃烧中的行为[J].热能动力工程, 1999, 14(2):83-85.
[9]贾明生,张乾熙.影响煤灰熔融性温度的控制因素[J].煤化工,2007, 18(3):1-5.
[10]毛军,徐明厚,李帆.碱性矿物质对煤灰熔融特性影响的研究[J].华中科技大学学报(自然科学版), 2003, 31(4):59-62.
[11]修洪雨,黄镇宇,张堃等. CaO对煤灰主要成分熔融特性的影响[J].电站系统工程, 2005, 21(2):20-22.
[12]姚星一.煤灰熔点与化学成分的关[J].燃料化学学报, 1965,6(2):151-161.
[13]姚润生,李小红,左永飞等.钠基助熔剂对灵石煤灰熔融特性温度的影响[J].煤炭学报, 2011, 36(6):1027-1031.
[14]戴爱军,杜彦学,谢欣馨.煤灰成分与灰熔融性关系研究进展[J].煤化工, 2009, 32(4):16-19.
[15]康艳红,李光哲,李国德等.煤燃烧过程中金属元素迁移特性[J].电力环境保护, 2009, 25(1):44-46.