污泥对高灰熔融温度煤灰熔融特性调控机制  

Investigationon regulation mechanism of sludge on the ash melting characteristics of coal with high ash fusion temperature(AFT)

作　　者：李萌[1] 陈雪莉[1] 李风海 许建良[1] 刘霞[1] LI Meng;CHEN Xueli;LI Fenghai;XU Jianliang;LIU Xia(Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China;School of Chemistry and Chemical Engineering,Heze University,Heze 274015,China)

机构地区：[1]华东理工大学含碳废弃物资源化零碳利用教育部工程研究中心,上海200237 [2]菏泽学院化学化工学院,山东菏泽274015

出　　处：《洁净煤技术》2023年第7期198-208,共11页Clean Coal Technology

基　　金：上海市2020年度“科技创新行动计划”社会发展科技攻关资助项目(20dz1203300)。

摘　　要：我国高灰熔融温度煤储量巨大,灰中硅铝含量高,而部分污泥中碱性氧化物含量高,将其与高灰熔融温度煤共气化为高灰熔融温度煤灰熔融特性的调控提供了可能。研究了城市污泥(CS)和制药污泥(ZY)对高灰熔融温度焦作煤(JZ)灰熔融特性的影响。结果表明:向JZ灰中添加CS灰和ZY灰均可降低其灰熔融温度,添加ZY灰对JZ灰熔融温度降低效果更明显;CS灰和ZY灰的添加比例分别为15%和10%时,2种混合灰的流动温度降至1380℃以下,满足气流床气化液态排渣要求。CS灰CaO含量高,ZY灰Fe_(2)O_(3)含量高,随污泥灰添加,CS灰中CaO与Al_(2)O_(3)和SiO_(2)反应生成的钙长石增多,其与石英发生共熔导致液相含量增加降低了灰熔融温度;弱还原气氛下JZ-ZY灰中Fe 3+被还原为Fe 2+,并使生成的铁尖晶石等铁系矿物质增多,低熔点铁尖晶石在低温下熔融及铁系矿物质与其他物质发生的低温共熔降低了JZ灰熔融温度。污泥灰添加比例相同时,与JZ-CS灰相比,JZ-ZY灰中理论固相含量更低;晶相衍射峰强度和数量更低;1500℃时,ZY灰占比25%的混合灰达到全液相状态,而CS灰占比25%的混合灰中仍有部分莫来石。摩尔离子势α与2种混合灰的特征温度均呈线性正相关。JZ-ZY灰的α降幅更大,因此JZ-ZY灰熔融温度降低更明显。The reserve of high ash fusion temperature coal in China is huge,and the content of silicon and aluminum in the ash is high,while the content of basic oxide in some sludge is high.The co-gasification of sludge and high ash fusion temperature coal provides the possibility of regulating the ash melting characteristics of high ash fusion temperature coal.In this study,the effects of municipal sludge(CS)and pharmaceutical sludge(ZY)on the ash melting characteristics of Jiaozuo coal(JZ)with high ash fusion temperature were investigated.The results show that adding CS ash and ZY ash to JZ ash can reduce ash fusion temperature of JZ and adding ZY ash has a more significant effect on reducing the ash fusion temperature of JZ.When the CS and ZY ash ratio is 15%and 10%,respectively,the flow temperature of JZ-CS and JZ-ZY mixtures are reduced to below 1380℃to meet the slag discharge requirements of entrained flow gasifier CS ash has a high CaO content,and ZY ash has a high Fe 2O 3 content.With the addition of CS ash,the amount of anorthite formed by reaction of CaO in CS ash with Al 2O 3 and SiO 2 increases,and its co-melting with quartz results in the increase of liquid phase content and the decrease of ash melting temperature.Under a weak reducing atmosphere,the Fe 3+in JZ-ZY ash is reduced into Fe 2+,and iron-bearing minerals such as hercynite increases.Hercynite with low melting point can melt at low temperature,and iron-bearing minerals easily form low melting point eutectic with other minerals,which decreases the ash fusion temperature(AFT)of JZ.When the proportion of sludge ash added is the same,compared with JZ-CS ash,JZ-ZY ash has a lower theoretical solid content,lower intensity and quantity of crystal phase diffraction peaks.When the temperature is 1500℃,the mixed ash with 25%ZY ash reaches the full liquid state,while the mixed ash with 25%CS ash still contains some mullite.Mole ionic potentialαis positive linearly correlated with the characteristic temperatures of both types of mixed ash.The decrease inαva

关 键 词：高灰熔融温度煤 污泥 灰熔融特性 流动温度 调节机制 

分 类 号：TQ534[化学工程—煤化学工程]