摘要
煤灰中矿物质在不同气氛条件下的转化机理影响煤的熔融结渣过程。为了研究在富氧/水–氧气氛下准东煤的熔融特性,并为预防燃用准东煤锅炉的结渣提供参考,使用电荷耦合器件(charge coupled device,CCD)相机记录准东煤粉样品在热台上形变的过程。通过图像处理技术对煤粉样品在不同温度下的面积变化进行分析计算,得到面积变化特征点对应的煤粉熔融温度,并对比不同富氧/水–氧气氛条件下准东煤粉开始熔融的温度。研究表明,随着氧气体积分数增加,煤粉开始熔融的温度降低;随着水蒸气体积分数减小,煤粉开始熔融的温度升高,水蒸气和富氧气氛能促进准东煤粉熔融行为。
The transformation mechanism of minerals in coal ash under different atmospheric conditions affects the melting and slagging process of coal. In order to study the melting characteristics of Zhundong coal under oxygenrich/ H2O-O2 atmosphere, and provide reference for preventing the slagging of Zhundong coal-fired boilers, the charge coupled device (CCD) camera was used to record the deformation process of the pulverized Zhundong coal on the hot stage. By calculating the sampling areas of the pulverized coal at different temperatures, the melting temperatures corresponding to the characteristic change points of the pulverized coal areas were obtained. The temperatures at which Zhundong coal powder began to melt under different oxygen-rich/H2O-O2 atmosphere conditions were compared. The study have shown that as the oxygen concentration increases, the temperature at which the coal powder begins to melt decreases. As the water vapor concentration decreases, the temperature at which the coal powder begins to melt increases. Both water vapor atmosphere and oxygen-rich atmosphere can promote the melting behavior of Zhundong coal.
作者
周昊
陈振寰
张佳凯
周陈颖
ZHOU Hao;CHEN Zhenhuan;ZHANG Jiakai;ZHOU Chenying(State Key Laboratory of Clean Energy Utilization(Zhejiang University), Hangzhou 310007, Zhejiang Province, China)
出处
《发电技术》
2019年第3期208-212,共5页
Power Generation Technology
基金
国家重点基础研究发展计划项目(2015CB251501)~~
关键词
准东煤
熔融特性
富氧气氛
水氧气氛
热台实验
电荷耦合器件(CCD)相机
Zhundong coal
melting characteristics
oxygen-rich atmosphere
H2O-O2 atmosphere
hot stage experiment
charge coupled device (CCD) camera
