喷雾热解法加热壁温对铈锆固溶体生产过程的影响  

Effect of heating wall temperature on Cerium Zirconium Solid Solution productive process by spray pyrolysis

作　　者：伍永福[1,4] 栗志 赵爽 刘中兴 王振峰[2,4] 董云芳 刘玉宝 马守营[1] WU Yongfu;LI Zhi;ZHAO Shuang;LIU Zhongxing;WANG Zhenfeng;DONG Yunfang;LIU Yubao;MA Shouying(Faculty of Energy and Environment,Inner Mongolia Universityof Science and Technology,Baotou 014000,China;Faculty of Materials and Metallurgy,Inner Mongolia Universityof Science and Technology,Baotou 014000,China;State Key Laboratory of Baiyunebo Rare Earth Resources Research and Comprehensive Utilization,Baotou Rare Earth Research Institute,Inner Mongolia,Baotou 014000,China;Clean extraction and application of light rare earth Inner Mongolia Autonomous Region Engineering Rescarch Center,Baotou 014000,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014000 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014000 [3]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014010 [4]轻稀土清洁提取与应用内蒙古自治区工程研究中心,内蒙古包头014010

出　　处：《中国粉体技术》2024年第2期1-11,共11页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:51964039;内蒙古自治区自然科学基金项目,编号:2022LHMS05004;内蒙古自治区应用技术研究与开发资金项目,编号:2021GG0103。

摘　　要：【目的】为了探究喷雾热解过程中加热壁温对铈锆固溶体生产过程的影响,分析热解炉内的流量场和浓度场的变化情况,实现对热解炉的设计优化。【方法】采用数值模拟的方法,建立喷雾热解炉的物理模型,分别探讨加热壁温对铈锆固溶体在热解炉的不同阶段及热解炉中水蒸气分布和HCl分布的影响。【结果】当热解温度为850℃时,液滴的反应主要分2个阶段,在炉膛高度为0~0.05 m处,为加热蒸发阶段,在炉膛高度为0.05~0.6 m处,为稳态热解阶段。当炉壁温度为550~650℃时,在炉膛高度为0.9 m处温度变化放缓,喷雾处于稳定热解阶段;而壁温在750~850℃时,在炉膛高度为0.6 m处温度变化放缓;当壁温为850℃时,在炉膛高度为0.1~0.6 m处的温度曲线斜率最大,液滴达到稳定蒸发阶段的时间缩短,水分蒸发变快,热解时间变短。【结论】炉壁加热区的温度越高,HCl生成的速度越快,速度的最大值越小,在炉膛高度为0.4 m处速度变化最大,达到1.6 m/s左右;并且整体HCl生成的量随温度的升高而增大,平均速度变化随着热空气温度的升高而减小。Objective During spray pyrolysis, a series of complex chemical reactions and physical changes occur, most of which occur at high temperatures. Therefore, it is difficult to directly observe the velocity field and various concentration fields in pyrolysis furnaces, but the velocity field, temperature field and various concentration fields have a crucial impact on the design optimization of pyrolysis furnaces and the study of pyrolysis processes. In order to investigate the effect of the heating wall temperature on the solution of cerium-zirconium solids during spray pyrolysis, the temperature field, flow field and concentration field variations in the pyrolysis furnace were analyzed and further design and optimization of the pyrolysis furnace was implemented.Methods A hydrodynamic numerical simulation method was used to simulate the spray pyrolysis furnace and a physical model of the spray pyrolysis furnace was developed. The influence of heating wall temperature on the reaction process was studied, and on the premise of verifying the correctness of the model, it was hoped that the changes of various fields during the reaction process of spray pyrolysis furnace could be accurately reflected, and the simulation results could be used to guide the optimization of the experiment. The thermal and velocity fields in the pyrolysis furnace were calculated quantitatively. The distributions of the temperature, velocity and concentration fields in the furnace at different heating wall temperatures were described qualitatively and quantitatively and compared.Results and Discussion In the process of spray pyrolysis, when the temperature of spray pyrolysis is 850 ℃, the reaction of spray pyrolysis droplets is mainly divided into two stages, respectively: at 0-0.05 m in the furnace, it is the spray pyrolysis heating evaporation stage. Within 0.05-0.6 m of the furnace, the steady-state pyrolysis phase of the spray pyrolysis occurs. When the spray pyrolysis furnace wall temperature rises from 550 ℃ to 650 ℃, the spray pyroly

关 键 词：喷雾热解 铈锆固溶体 稳态热解 稳定热解 

分 类 号：TB4[一般工业技术] TQ051.8[化学工程]