洁净煤技术

2019, (05) 101-105

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低水分澳煤燃尽特性较差关键因素研究
Study on key factors of poor burnout characteristic of low-moisture Australian coal

宋玉彩;
SONG Yucai

摘要(Abstract):

近年来我国燃煤电厂大量进口澳煤,根据煤质特性,澳煤可分为高水分澳煤和低水分澳煤,其中高水分澳煤的煤质指标和燃烧特性与我国神混类煤基本相似,低水分澳煤的煤质指标与我国优混类煤基本相似,但电厂燃用低水分澳煤时存在飞灰含碳量高、锅炉效率下降等问题。为探求低水分澳煤燃尽特性差的关键原因及其判别方法,为低水分澳煤的合理利用或燃煤锅炉优化调整提供指导依据,选取2个典型的澳煤煤样和典型的优混煤煤样,采用煤质指标分析、可磨性分析、热分析、孔隙率分析和马尔文粒径分析等方法,对比研究澳煤与优混煤的煤质指标、燃烧特性、孔隙率和粒径分布等差异。研究结果表明,澳煤的基本煤质指标与国内同类优混差异不大,但氧含量低,说明澳煤的煤化程度高于优混煤;澳煤可磨性系数随氧含量的降低而减小,即随澳煤煤化程度的加深,可磨性变差,因此可通过可磨性系数或氧含量来初步判断澳煤的燃尽特性。采用热分析的燃尽指数C700判断煤的燃尽特性更符合实际应用情况。相同制粉条件下,澳煤的煤粉细度大,粗颗粒煤粉更多,是其难燃尽的根本原因。
In recent years,a large amount of Australian coal has been imported to coal-fired power plants in China,which can be classified by high-moisture Australian coal and low-moisture Australian coal according to the coal characteristics.The coal quality index and combustion characteristic of high-moisture Australian coal is similar to that of the Shenhun coal in China,while the characteristic of low-moisture Australian coal is similar to that of the Youhun coal in China.It is usually found that the carbon content of fly ash increases and the boiler efficiency decreases when the low-moisture Australian coal is used in coal-fired boilers.In order to explore the key reasons for the poor burnout characteristics of low-moisture Australian coal and their discrimination methods,and provide guidance for the reasonable use of low-moisture Australian coal and the optimization of combustion adjustment,the low-moisture Australian coal and Youhun coal were sampled for research.By means of coal quality index analysis,grindability analysis,thermal analysis,porosity analysis and Malvine particle size analysis,the differences of coal quality index,combustion characteristics,porosity and particle size distribution between Australian coal and premium coal blends were studied.The results show that the coal characteristics are similar between the two coal samples,but the oxygen content of low-moisture Australian coal is lower than that of Youhun coal,which indicates that the coalification level of Australian coal is higher than that of Youhun coal.The Hardgrove grind ability index(HGI)or the oxygen content can be used to determine the burnout characteristics of Australian coal since the HGI decreases when the oxygen content increases.Besides,the defined burnout index C700 of thermal analysis is effective to describe the practical combustion characteristics too.The larger pulverized coal size under the same milling conditions is determined to be the main reason why the low-moisture Australian coal is hard to burn out.

关键词(KeyWords): 低水分澳煤;燃尽特性;哈氏可磨指数;孔隙率;粒径分布
low-moisture Australian coal;burnout characteristic;HGI;porosity;size distribution

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作者(Author): 宋玉彩;
SONG Yucai

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