氧化铝耐火材料制备中热应力有限元分析  

Finite Element Analysis of Thermal Stress in Preparation of Alumina Refractories

作　　者：栾雪 赵莹[1] 陈滨滨 蔡酉铖 程桂石[1] 王孝强[1] 董长青[1] LUAN Xue;ZHAO Ying;CHEN Binbin;CAI Youcheng;CHENG Guishi;WANG Xiaoqiang;DONG Changqing(School of New Energy College,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学新能源学院,北京102206

出　　处：《电力科学与工程》2024年第4期65-71,共7页Electric Power Science and Engineering

基　　金：国家自然科学基金资助项目(52006072)。

摘　　要：氧化铝耐火材料在制备过程中所产生的裂纹等轻微损伤,是潜在的安全风险。为提高材料的使用性能,研究了在烧成过程中模型尺寸、热处理温度、升温速率、降温速率以及气孔率等因素对氧化铝耐火材料裂纹产生的影响。结果表明:在模型尺寸增大时,对应的最大热应力值也随之增大,产生裂纹的风险也越大;最大热应力峰值出现在1200~1600℃温度区间内;只改变1000~1350℃温度区间内的升温速率时,升温速率越大对应的最大热应力值越大;窑炉从1600℃降到室温时,降温初期最大热应力值迅速增大,且降温速率越大对应的最大热应力值越大;对于气孔率分别为5%、7%和10%的氧化铝砖坯,在相同的烧成条件下,气孔率10%砖坯的最大热应力值于1200℃、1300℃、1400℃及1500℃均最小,因此气孔率为10%比5%和7%更有利于降低烧成过程中裂纹产生的风险。Minor damage such as cracking during the preparation of alumina refractory is a potential safety risk.The effects of model size,heat treatment temperature,heating rate,cooling rate and porosity on the formation of refractory cracks in alumina were investigated to improve the performance of the materials.The results show that the maximum thermal stress increases with the increase of the model size,and the risk of crack formation increases;the maximum thermal stress appears in the temperature range from 1200 to 1600℃;when the heating rate is changed only in the temperature range from 1000℃to 1350℃,the higher the heating rate is,the larger the maximum thermal stress value is;as the furnace cools from 1600℃to room temperature,the maximum thermal stress value rapidly increases during initial cooling period,and the maximum thermal stress value is larger with a greater cooling rate.For the alumina brick blank of 5%,7%and 10%,under the same firing condition,the maximum thermal stress of the brick blank with 10%porosity is minimum at 1200℃,1300℃,1400℃and 1500℃.Therefore,the brick blank with 10%porosity is better than the brick blank with 5%and 7%porosity in reducing the risk of cracks during firing.

关 键 词：氧化铝耐火材料 有限元分析 热应力场 裂纹 

分 类 号：TQ175.7[化学工程—硅酸盐工业]