镁热法生产海绵钛过程反应器温度场模拟研究  

Numerical simulation of the temperature field in titanium sponge reactor during magnesium thermal production process

作　　者：李吉帆 盛卓 李开华[2,3] 孙浩山[1] 张小辉[1] 李冬勤 李亮[2] 周杰 陈秀敏[1] Li Jifan;Sheng Zhuo;Li Kaihua;Sun Haoshan;Zhang Xiaohui;Li Dongqin;Li Liang;Zhou Jie;Chen Xiumin(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China;College of Materials Science and Engineering,Sichuan University,Chengdu 610064,Sichuan,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]攀钢集团研究院有限公司,钒钛资源综合利用国家重点实验室,四川攀枝花617000 [3]四川大学材料科学与工程学院,四川成都610064

出　　处：《钢铁钒钛》2023年第2期20-27,共8页Iron Steel Vanadium Titanium

基　　金：钒钛资源综合利用产业技术创新战略联盟2021年协同研发项目—镁热法生产海绵钛反应过程流场数值模拟与动力学研究(FTLM2021-2021530103000763)。

摘　　要：以7.5 t“I”炉实际尺寸为基础,建立镁热法生产海绵钛还原炉物理模型,模拟还原过程中炉内温度场分布。研究发现,在TiCl4中心加料工况下,反应器由内向外,在横向和纵向均形成明显的温度梯度,从反应中心区至器壁温度逐渐降低,且上部氩气区域温度明显低于反应区熔体温度。提高TiCl4给料速度,延长连续给料时间均能使反应区最高温度和平均温度呈现上升趋势。对于7.5 t“I”型炉,当料速低于280 kg/h时,反应释放热量低于风冷区的散热量,生产中需要对反应器进行补热,当给料速度从200 kg/h提高至400 kg/h时,3 h内反应区最高温度由986.5℃上升至1 167.4℃。当器壁控制温度由820℃降低至750℃时,反应中心温度降低约18℃,即增大器壁与反应中心温度梯度有利于促进炉内熔体散热。通过建立合理的壁温控制和加料、排料制度,能够避免海绵钛出现硬芯,改善产品质量。Based on the size of 7.5 t“I”type furnace,the physical model of titanium sponge reactor was established to simulate the temperature field.Under the center feeding condition of TiCl4,it is found that the temperature gradient is formed both horizontally and vertically from the inside-out of the reactor.The temperature gradually decreases from the center to the wall,and the temperature of upper Ar zone is obviously lower than the melt temperature in the reaction zone.With the increasing feed rate and time of TiCl4,the maximum and average temperature of the reaction zone increase.As to 7.5 t“I”type furnace,when the feed rate is lower than 280 kg/h,heat generation is lower than heat dissipation in the air-cooling zone,hence reactor need be heated by electric furnace.When the feed rate goes from 200 kg/h to 400 kg/h,the maximum temperature in reaction zone increases from 986.5℃to 1167.4℃in 3 hours.When the reactor wall temperature decreases from 820℃to 750℃,the temperature of reaction center decreases about 18℃,which means that enlarging the temperature gradient between the wall and the reaction center is conducive to promoting the heat dissipation of the melt in the furnace.By establishing reasonable wall temperature control,feeding and discharging system,hard core can be avoided and product quality can be improved.

关 键 词：海绵钛 镁热还原 温度场 数值模拟 

分 类 号：TF823[冶金工程—有色金属冶金]