恒温时间对煤灰熔体熔融行为的影响研究  

Influence of Constant Temperature Time on Melting Behavior of Coal Ash Melt

作　　者：王宁宁[1] 李寒旭[1] 夏宝亮 李懂 陈建杨 WANG Ningning;LI Hanxu;XIA Baoliang;LI Dong;CHEN Jianyang(School of Chemical Engineering,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学化学工程学院,淮南232001

出　　处：《硅酸盐通报》2023年第10期3652-3659,共8页Bulletin of the Chinese Ceramic Society

基　　金：安徽高校自然科学研究重点项目(KJ2020A0278);安徽省煤炭资源综合利用工程技术研究中心开放基金(MTYJZX202203);国家重点研发计划(2019YFC1904304)。

摘　　要：在煤的气化过程中,煤灰中的无机组分短时间内会发生热解、团聚或结渣等行为,严重影响气化炉安全稳定运行。为探究煤灰停留在气化炉内的熔融过程和煤灰矿物转化行为,本文利用XRF、XRD、FTIR等测试方法和FactSage软件对不同温度和时间跨度处理后煤灰的化学组成、矿物组成、熔体结构进行了分析。结果表明:在1200、1300、1400℃条件下,当恒温时间由10 s逐渐增加至30 min时,煤灰中矿物种类均无明显变化,但SiO_(2)、CaO、SO_(3)占比有较大改变;矿物的非晶态物质随着温度的升高以及恒温时间的延长而增加;煤灰熔体结构由复杂的架状结构逐渐解聚为简单的环状、岛状等结构;煤灰黏度也随温度的升高逐渐降低,在达到转折温度1240℃后,温度与恒温时间对煤灰熔体熔融行为影响较小。In the process of coal gasification,the inorganic components of coal ash will be pyrolyzed,agglomerated or slagged in a short time,which seriously affects the safe and stable operation of gasifier.In order to explore the melting process of coal ash staying in gasifier and the transformation behavior of coal ash minerals,XRF,XRD,FTIR and other test methods and FactSage sofeware were used to analyze the chemical composition,mineral composition and melt structure of coal ash treated at different temperatures and time spans.The results show that under the conditions of 1200,1300 and 1400℃,when the constant temperature time gradually increases from 10 s to 30 min,the mineral type in coal ash has no obvious change,while the proportion of SiO_(2),CaO and SO_(3) in coal ash has a great change.The amorphous substance of mineral increases with the increase of temperature and the extension of constant temperature time.At the same time,the structure of ash melt is gradually depolymerized from complex frame structure to simple ring,island and other structures.The viscosity of coal ash also decreases gradually with the increase of temperature.After reaching the turning point of 1240℃,temperature and constant temperature time have little influence on melting behavior of coal ash melt.

关 键 词：高温煤灰 恒温时间 矿物转化 熔体结构 熔体黏度 FactSage软件 

分 类 号：TQ534[化学工程—煤化学工程]