Mineral transmutation of high alkali Zhundong coal in ash melting process" /> 高碱金属准东煤灰熔融过程的矿物质衍变
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浙江大学学报(工学版)
浙江大学学报(工学版)
能源工程     
高碱金属准东煤灰熔融过程的矿物质衍变
周永刚1, 范建勇2, 李培1, 王炳辉1, 赵虹1
1. 浙江大学 能源清洁利用国家重点试验室,浙江 杭州,310027；2. 福建省电力勘测设计院,福建 福州 350003

Mineral transmutation of high alkali Zhundong coal in ash melting process
ZHOU Yong-gang1, FAN Jian-yong2, LI pei1, WANG Bing-hui1, ZHAO Hong1
1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; 2. Fujian Electric Power Survey & Design Institute, Fuzhou 350003,China
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摘要：

通过利用热分析和X-射线衍射物相分析对准东煤灰在加热过程中的矿物质演变进行研究,以探究准东煤的结渣机理.试验结果表明：热分析得到的TG曲线上的明显失重段(960～1 250 ℃)硬石膏存在的温度段相符,失重是由硬石膏受热分解产生SO3气体引起的.准东煤的高碱金属含量特性,致煤灰中含有多种含钠矿物质.煤灰中主要矿物质有含钠矿物质钠长石、霞石和蓝方石以及硬石膏、石英、赤铁矿、方解石.霞石分解形成石英等矿物质,和钠长石等作用形成低熔点蓝方石；中间产物透辉石与硅铝酸盐及赤铁矿等作用形成钙长石钙黄长石镁黄长石等,进一步发生低温共熔反应形成熔点低达1 170 ℃的共熔体；蓝方石发生熔融反应形成熔点在900～1 000 ℃的硬玉.灰熔融过程,含钠矿物质对低温共熔反应起重要的促进作用.准东煤的高碱金属特性使煤灰中及其灰熔融过程的矿物质均为助熔性矿物质而无耐熔性矿物质,极易发生低温共熔反应,形成低熔点共熔体,降低灰熔融温度,增加灰渣黏性,促进结渣,是准东煤强结渣倾向的根本原因.
Abstract:

Mineral transmutation in the melting process was studied by the thermal analysis and X-ray diffraction phase analysis to explore Zhundong coal's slagging mechanism. Experimental results show that the apparent weightlessness(960~1 250 ℃) on TG curves of thermal analysis accord with the existence of anhydrite. The release of SO3 gas in the decomposition of anhydrite leads the weightlessness. High alkali ends with many alkali-contained minerals. There are anhydrite, calcite, quartz, hematite, albite, nepheline, hauyne in the coal ash. Nepheline breaks down to form quartz and react with silicates such as albite etc. to form hauyne with low melting point. Intermediate diopside reacts with silicates and hematite to form gehlenite, akermanite, augite etc. These products will further react with each other in eutectic reaction to produce low melting eutectic of melting point at 1 170 ℃. During the eutectic reaction of hauyne, the jadeite with low melting point at 900 ℃~1 000 ℃ is generated. There are lots of melting-easy minerals and few refractory minerals in high alkali Zhundong coal's ash and in the ash melting process which lead to the low temperature eutectic reaction in which the melt with low melting point is formed, lower the ash fusion temperature, increase the viscosity of ash and slag. This is the reason why Zhundong coal has a strong slagging tendency.
出版日期: 2015-08-01
:  TQ 534  
通讯作者: 周永刚(1974—),男,工程师,从事煤粉燃烧、能源清洁利用等方面的研究     E-mail: trooper@zju.edu.cn
作者简介: 周永刚(1974—),男,工程师,从事煤粉燃烧、能源清洁利用等方面的研究.Email: trooper@zju.edu.cn
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引用本文:

周永刚, 范建勇, 李培, 王炳辉, 赵虹. 高碱金属准东煤灰熔融过程的矿物质衍变[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2015.08.022.

ZHOU Yong-gang, FAN Jian-yong, LI pei, WANG Bing-hui, ZHAO Hong.

Mineral transmutation of high alkali Zhundong coal in ash melting process. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2015.08.022.

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http://www.zjujournals.com/eng/CN/ 10.3785/j.issn.1008-973X.2015.08.022    或    http://www.zjujournals.com/eng/CN/Y2015/V49/I8/1559

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