洁净煤技术

2019, (04) 106-110

[打印本页] [关闭]
本期目录(Current Issue) | 过刊浏览(Past Issue) | 高级检索(Advanced Search)

煤泥用于流化床燃烧时的结团过程研究
Investigation of agglomeration process of coal slime used in fluidized bed combustion

王飞;赵江婷;张圆圆;张雷;杨凤玲;张培华;郭庆;程芳琴;
WANG Fei,ZHAO Jiangting,ZHANG Yuanyuan,ZHANG Lei,YANG Fengling,ZHANG Peihua,GUO Qing,CHENG Fangqin

摘要(Abstract):

循环流化床燃烧是煤泥利用的主要方式之一,湿煤泥入炉后的凝聚结团现象具有两面性,对煤泥在循化流化床中的稳定燃烧至关重要。为了探究煤泥结团过程的机理,为煤泥的高效利用提供理论指导,笔者分别从时间和空间两个角度,对煤泥团在入炉后抗压强度、水分、矿物及官能团随时间的变化以及煤泥柱外部、中部及内部的变化进行研究。抗压强度是衡量结团强度的重要指标,结果表明,煤泥柱的抗压强度随停留时间的延长呈先增大后降低的趋势,结合对煤泥不同时间正面及剖面的观察以及不同时间水分、矿物质种类及官能团变化的结果,分析认为,0~30 s时,煤泥柱抗压强度增加主要与水分蒸发有关; 30~90 s时,抗压强度的变化可能不仅与水分有关,还与高温下的热解及热分解有关; 90~210 s时,抗压强度迅速增加,与矿物质和官能团的变化有关,但也可能与挥发分析出过程中产生的中间相有关。温度是影响煤泥凝聚结团的重要因素,炉温较低时,水分和挥发分析出较缓慢,不利于中间相发育,故抗压强度相对较低,在一定范围内抗压强度随炉温的升高而增大,但炉温过高,引起挥发分快速析出,可能抑制中间相的发育而影响抗压强度,因此合适的炉温利于中间相的形成,促进抗压强度的增加,850℃可使煤泥达到相对较高的抗压强度。
The circulating fluidized bed(CFB) combustion is one of the main ways of coal slime utilization.The agglomeration phenomenon of wet coal slime into the furnace has two sides,which is very important for the steady combustion of coal slime in the CFB.In order to explore the mechanism of coal slime agglomerating process and provide theoretical guidance for the efficient utilization of coal slime,from two perspectives of time and space,the changes of compressive strength,water,minerals and functional groups with time,and the changes in the outer,middle and inner parts of the slime column after coal slurry put into the furnace were studied systematically.The compressive strength is an important index to measure agglomeration strength.The results shows that the compressive strength of the slime column increases first and then decreases with the prolongation of the residence time.Based on the results of the observation of the front and the section of slime column in different time and the results of the water,minerals and the change of the functional group at different time,it is concluded that the increase of compressive strength of coal slime column is mainly related to the evaporation of water at 0-30 s.The change of the compressive strength may be related not only to the moisture,but also to the pyrolysis and thermal decomposition at the high temperature at 30-90 s.The rapid increase of the compressive strength at 90-210 s is related to the changes of the mineral and functional groups,but it may also be related to the mesophase produced in the process of volatilization.The temperature is an important factor affecting the agglomeration of coal slime.When the furnace temperature is low,the moisture and volatilization release slowly,which is not conducive to the development of mesophase,therefore,the compressive strength is relatively low.In a certain range,the compressive strength increases with the increase of furnace temperature,but when the furnace temperature is too high,which causes rapid volatile precipitation,may inhibit the development of mesophase and affect the compressive strength.Therefore,an appropriate furnace temperature is conducive to the formation of mesophase and promotes the increase of compressive strength.It can make the slime reach a relatively high compressive strength at 850 ℃.

关键词(KeyWords): 煤泥;循环流化床;结团;抗压强度
coal slime;CFB;agglomeration;compressive strength

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 王飞;赵江婷;张圆圆;张雷;杨凤玲;张培华;郭庆;程芳琴;
WANG Fei,ZHAO Jiangting,ZHANG Yuanyuan,ZHANG Lei,YANG Fengling,ZHANG Peihua,GUO Qing,CHENG Fangqin

Email:

参考文献(References):

文章评论(Comment):

序号(No.) 时间(Time) 反馈人(User) 邮箱(Email) 标题(Title) 内容(Content)
反馈人(User) 邮箱地址(Email)
反馈标题(Title)
反馈内容(Content)
扩展功能
本文信息
服务与反馈
本文关键词相关文章
本文作者相关文章
中国知网
分享