添加剂对高碱煤钠迁移和灰分烧结温度的影响  

Influence of additives on sodium release and ash sintering temperature of a high-alkali coal

作　　者：刘炎泉 程乐鸣[1] 季杰强 方梦祥[1] 王勤辉[1] 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)

机构地区：[1]浙江大学热能工程研究所能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《燃料化学学报》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~~

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.

关 键 词：准东煤 添加剂 钠捕集效率 烧结温度 矿物演变 

分 类 号：TQ53[化学工程—煤化学工程]