鼓泡流化床内高钛渣氯化过程模拟  

Simulation of Chlorination of High-Titanium Slag in a Bubbling Fluidized Bed

作　　者：邹汪阳 顾素敏 陈恒志[1] ZOU Wangyang;GU Sumin;CHEN Hengzhi(College of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China;State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Science,Taiyuan 030001,China)

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]中科院山西煤炭化学研究所煤高效低碳利用全国重点实验室,山西太原030001

出　　处：《化学反应工程与工艺》2023年第5期405-415,共11页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金项目(51374261)。

摘　　要：本研究建立了高钛渣氯化反应的未反应缩核动力学模型(SCM),并在小型鼓泡流化床中获得了动力学参数。将SCM与双流体模型(TFM)耦合建立了TFM-SCM模型,模拟研究了鼓泡流化床中的高钛渣氯化反应过程,模型预测与实验结果吻合较好。模拟结果显示:反应器出口的TiO_(2)转化率随氯气浓度和反应温度的升高而增加;反应温度是影响氯化反应的关键因素,当反应温度为1223K时,TiO_(2)的转化率可达98%;当氯化反应速率较小时,气泡是影响氯化反应的另一个重要因素。提高反应温度能明显提高流化床中乳相的反应速率,但对气泡相的氯化反应速率影响较小。氯化反应速率在床层中心区域较低,在近壁区域较大。In this work,the shrinking unreacted core reaction kinetic model(SCM)for chlorination reaction of high-titanium slag was built and then its kinetic parameters were obtained through regressing experimental data in a small scale bubbling fluidized bed.ATFM-SCM model was established by coupling SCM with a two fluid model(TFM)to simulate the chlorination process of high titanium slag in a bubbling fluidized bed.The model predictions were in good agreement with experimental results.The simulation results showed that the conversion of TiO_(2)in the reactor increased with the increase of reaction temperature and chlorine concentration in the feed gas.Reaction temperature was the key factor that affected chlorination reaction of high-titanium slag and the conversion of TiO_(2)could reach 98%when reaction temperature was 1223 K.Bubbles were another important factor that influenced chlorination process as chlorination rate was small.Increasing reaction temperature could significantly promote the reaction rate in the emulsion phase,but had a minor effect in the bubble phase.The reaction rate was smaller in the central region,but larger near the wall region.

关 键 词：高钛渣 鼓泡流化床 氯化反应 双流体模型 未反应缩核 

分 类 号：TQ051.5[化学工程]