恒温时间对煤灰熔体熔融行为的影响研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3652-3659.

恒温时间对煤灰熔体熔融行为的影响研究

王宁宁, 李寒旭, 夏宝亮, 李懂, 陈建杨

安徽理工大学化学工程学院,淮南 232001

收稿日期:2023-05-15 修订日期:2023-07-17 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 李寒旭,博士,教授。E-mail:lhxtyx@163.com
作者简介:王宁宁(1998—),女,硕士研究生。主要从事煤炭清洁高效利用的研究。E-mail:2636828512@qq.com
基金资助:
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)

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

WANG Ningning, LI Hanxu, XIA Baoliang, LI Dong, CHEN Jianyang

School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China

Received:2023-05-15 Revised:2023-07-17 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

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1 200、1 300、1 400 ℃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SiO₂、CaO、SO₃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1 240 ℃后,温度与恒温时间对煤灰熔体熔融行为影响较小。

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

Abstract: 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 1 200, 1 300 and 1 400 ℃, 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 SiO₂, CaO and SO₃ 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 1 240 ℃, temperature and constant temperature time have little influence on melting behavior of coal ash melt.

Key words: high temperature coal ash, constant temperature time, mineral transformation, melt structure, melt viscosity, FactSage software

中图分类号:

TQ534

王宁宁, 李寒旭, 夏宝亮, 李懂, 陈建杨. 恒温时间对煤灰熔体熔融行为的影响研究[J]. 硅酸盐通报, 2023, 42(10): 3652-3659.

WANG Ningning, LI Hanxu, XIA Baoliang, LI Dong, CHEN Jianyang. Influence of Constant Temperature Time on Melting Behavior of Coal Ash Melt[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3652-3659.

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