氯化钛白氧化反应器结疤问题分析及数值模拟  

Scarring analysis and numerical simulation of TiCl4 oxidation reactor in chloride process of titanium dioxide

作　　者：周艾然 陆平 夏建辉[2] 李冬勤[2] 郭杰 杜明 董立春 ZHOU Airan;LU Ping;XIA Jianhui;LI Dongqin;GUO Jie;DU Ming;DONG Lichun(School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China;Pangang Group Panzhihua Steel Research Institute Co.Ltd.,Panzhihua 617000,Sichuan,China)

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]攀钢集团攀枝花钢铁研究院有限公司,四川攀枝花617000

出　　处：《化工学报》2023年第4期1499-1508,共10页CIESC Journal

基　　金：国家自然科学基金项目(22108019);重庆市博士后科学基金项目(CSTB2022NSCQ-BHX0021)。

摘　　要：氯化钛白生产工艺的核心是TiCl4氧化反应器,而内部关键部位的结疤问题显著影响其长周期稳定生产。通过对工业氯化钛白氧化反应器疤料的分析与表征,探究了氧化反应器关键位置的结疤原因,进而使用ANSYSFluent软件对实际运行工况条件下的氧化反应器内部流场和壁面温度进行了计算流体力学(CFD)模拟。模拟结果表明,反应器壁面温度、内部流场等因素对反应器的结疤具有十分重要的影响。提高反应器关键位置壁面温度,能够显著改善结疤现象,为防止KCl和AlCl3添加剂的沉积,反应器热氧区和TiCl4进料环的壁面温度应分别高于770和178℃;而为避免新生成的TiO2在反应器内表面的聚集,应减小或消除回流区,使得新生成的TiO2尽快通过反应区。TiCl4 oxidation reactor is the key equipment in the chloride process of TiO2,while the scarring inside the reactor significantly affects its long-period and consistent operation.In this study,the scarring reason in the industrial reactor was firstly investigated by composition analysis,and then,by the CFD simulation of the internal flow and wall temperature distribution,which is employed in the ANSYS-Fluent software package under the circumstance of actual operating conditions.The simulation results show that the reactor wall temperature,internal flow field and other factors have a very important influence on the scarring of the reactor.The wall temperature in the hot-oxygen zone should be higher than 770℃and that in the TiCl4 feeding ring should be higher than 178℃,respectively,for preventing the additives of KCl and AlCl3 depositing on the inner wall of the reactor.In order to avoid the newly generated TiO2 to aggregate on the inner wall of the reaction zone,vortexes should be eliminated or reduced for the newly generated TiO2 with high-activity to timely pass through the reaction zone.

关 键 词：数值模拟 计算流体力学 氯化钛白 氧化 防结疤技术 

分 类 号：TF823[冶金工程—有色金属冶金] TQ621[化学工程—精细化工]