|本期目录/Table of Contents|

[1]刘 扬,张 成,王 澜,等.高碱煤中钠基化合物对灰熔融特性的影响[J].燃烧科学与技术,2017,(03):268-273.[doi:DOI 10.11715/rskxjs.R201605022]
 Liu Yang,Zhang Cheng,Wang Lan,et al.Influence of Sodium-Based Compound on Ash Melting Characteristicsof High Alkali Coal[J].Journal of Combustion Science and Technology,2017,(03):268-273.[doi:DOI 10.11715/rskxjs.R201605022]
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高碱煤中钠基化合物对灰熔融特性的影响()
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《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

卷:
期数:
2017年03
页码:
268-273
栏目:
出版日期:
2017-06-15

文章信息/Info

Title:
Influence of Sodium-Based Compound on Ash Melting Characteristics of High Alkali Coal
作者:
刘 扬张 成王 澜张小培冯小飞陈 刚
华中科技大学煤燃烧国家重点实验室,武汉 430074
Author(s):
Liu YangZhang ChengWang LanZhang XiaopeiFeng XiaofeiChen Gang
State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China
关键词:
准东煤灰熔融特性
Keywords:
sodiumZhundong coalash melting characteristics
分类号:
TK16
DOI:
DOI 10.11715/rskxjs.R201605022
文献标志码:
A
摘要:
选取新疆准东煤田高钠煤(五彩湾煤和天池煤)为研究对象,研究了准东煤中碱金属钠的赋存形态和钠基 化合物对煤灰熔融特性影响机制.向低温灰中添加不同比例的 Na2O 然后制取其高温混灰,利用 X 射线衍射仪分 析矿物质组分在不同成灰温度下演化规律,探究碱金属钠对准东煤灰熔融特性的影响机制.结果表明:准东煤中 钠以水溶钠形式为主;天池煤随着钠含量的增加,灰熔融温度先降低后趋于稳定;五彩湾煤随着钠含量的增加, 灰熔融温度先降低后升高.天池煤掺混 10%,Na2O 导致灰熔融温度降低,是由于煤灰中白云石、氢氧化钙分解产 生大量 CaO,碱金属钠促进 CaO 与煤灰中 Si、Al 等反应生成含钙钠的低温共熔体,且有低熔点矿物无水芒硝生 成;五彩湾煤掺混 10%,Na2O 导致灰熔融温度降低,是由于煤灰中新生成低熔点的钙铁辉石和无水芒硝,且碱金 属钠促进钙铝黄长石和镁黄长石等含钙矿物质的低温共熔反应,掺混过量 Na2O 导致灰熔融温度升高,这是由于 煤灰中生成了大量高熔点矿物质.
Abstract:
Zhundong Wucaiwan coal and Tianchi coal were selected as research objects to study the occurrence form of alkali metal sodium and the influence mechanism of sodium-based compound on coal ash melting characteristics.By adding different proportion of Na2O to low temperature ash and making high temperature ashes,the evolution of mineral components at different ashing temperature was analyzed by X-ray diffractometer to analyze the influence mechanism of alkali metal sodium on ash melting characteristic.The results show that water soluble sodium is the main sodium,the ash melting temperature of Tianchi coal increases first and then tends to be stable with increasing Na2O ratio,and the ash melting temperature of Wucaiwan coal decreases first and then increases with increasing Na2O ratio.The reason for the decreasing ash melting temperature with the addition of 10% Na2O to Tianchi coal is that the decomposition of minerals in coal ash generates CaO under high temperature,high content of alkali metal sodium then promotes the low temperature eutectic reaction between CaO and Na、Si、Al, forming low temperature co-melt,and meanwhile thenardite of low melting point is generated in coal ash.The reason for the decreasing ash melting temperature with the addition of 10% Na2O to Wucaiwan coal is that heden-bergite and thenardite of low melting point are formed in coal ash,and alkali metal sodium promotes the low temperature eutectic reaction between gehlenite and akermanite.The reason for the increasing ash melting temperature with the addition of excessive Na2O to Wucaiwan coal is that there exist minerals of high ash melting point in coal ash.

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备注/Memo

备注/Memo:
收稿日期:2016-04-22. 基金项目:国家自然科学基金资助项目(51006042). 作者简介:刘 扬(1990— ),女,硕士,sdkj_liuyang@163.com. 通讯作者:张 成,男,博士,副教授,chengzhang@mail.hust.edu.cn. 网络出版时间:2016-05-13. 网络出版地址:http://www.cnki.net/kcms/detail/12.1240.TK.20160513.1050.002.html.
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