摘要
选取三种不同的添加剂(高岭土、SiO_2和Al_2O_3),研究它们对高碱准东煤钠迁移和灰分烧结温度的影响,并且添加比例为1%-5%。结果表明,三种添加剂的钠捕集效率依次为:高岭土>SiO_2>Al_2O_3。钠捕集效率随着添加比例的增加而升高,但受温度影响比较复杂。高岭土的钠捕集效率在600-1000℃先增加后减小,并在900℃达到最大值,其余两种随温度的升高均减小。准东煤灰的烧结温度为803℃,添加高岭土后,烧结温度随添加比例的增加先降低后上升。当添加比例为3%时,因为钙长石和钙黄长石的低温共熔反应而达到最小值。SiO_2的添加比例为5%时,由于透辉石的生成和SiO_2本身的"骨架"作用,烧结温度迅速升高到879℃。Al_2O_3对烧结温度的影响最小。
The influence of three additves(Kaolin,SiO 2 and Al 2O 3)on sodium release and ash sintering temperature of high-alkali Zhundong coal with addition ratio range of 1%-5%was studied.The results indicate that the order of sodium capture efficiency for the additives is:Kaolin>SiO 2>Al 2O 3.The sodium capture efficiency increases with the addition ratio.However,the effect of temperature is much complex.At 600-1000℃,the sodium caputre efficiency of Kaolin increases firstly and then decreases,and the maximum value is achieved at 900℃.Meanwhile,the sodium capture efficiencies of other two additives decrease with increasing temperature.In addition,the ash sintering temperature of Zhundong coal is 803℃.After adding Kaolin,it decreases firstly and then increases with the addition ratio.At the addition ratio of 3%,the sintering tempeature is lowest due to the low-melting eutectic reaction between gehlenite and anorthite.SiO 2 with 5%can increase the sinntering temperature to 879℃sharply because of generation of diopside and its skeleton effect.The influence of Al 2O 3 on the sintering temperature is minimal.
作者
刘炎泉
程乐鸣
季杰强
方梦祥
王勤辉
LIU Yan-quan;CHENG Le-ming;JI Jie-qiang;FANG Meng-xiang;WANG Qin-hui(State Key Laboratory of Clean Energy Utilization,Institute for Thermal Power Engineering, Zhejiang University,Hangzhou 310027,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2018年第11期1298-1304,共7页
Journal of Fuel Chemistry and Technology
基金
国家科技支撑计划(2015BAA04B02-09)资助~~
关键词
准东煤
添加剂
钠捕集效率
烧结温度
矿物演变
Zhundong coal
additive
sodium capture efficiency
sintering temperature
mineral evolution
