聚乙烯流化床反应器床内温度分布的模拟  

Simulation of Temperature Distribution in a Fluidized Bed Reactor for Ethylene Polymerization

作　　者：柏基业[1] 王校铮[2] 田洲[2] 冯连芳[2] 

机构地区：[1]中国石化扬子石油化工有限公司南京研究院,江苏南京210048 [2]化学工程联合国家重点实验室浙江大学化学工程与生物工程学系,浙江杭州310027

出　　处：《石油化工》2013年第9期984-989,共6页Petrochemical Technology

基　　金：国家高技术研究发展计划资助项目(2012AA040305)

摘　　要：针对Unipol聚乙烯工艺的流化床反应器内温度分布不均匀问题,建立了全混流(CSTRs)串联模型、乳化相NCSTRs串联模型和乳化相全混流模型。与工业装置所测温度分布比较表明,乳化相全混流模型最适用于描述流化床层的温度分布。采用调整气泡相分区以及串联CSTR个数的方法确定乳化相全混流模型参数为乳化相为1个CSTR,气泡相为26个串联的CSTRs;该模型可准确描述流化床层的温度分布,催化剂进料口附近的床层温升较快(7℃),反应器上部区域温度梯度较小(小于2℃);结合聚合反应动力学,该模型可预测工业乙烯聚合过程的聚合产量和产品密度等性质。To describe nonuniform temperature distribution in the fluidized bed reactor of Unipol ethylene polymerization process,three models were developed,including CSTRs series model,emulsion phase NCSTRs model and emulsion phase well mixing model.Based on the comparison between the simulated results and the actual plant data,the results predicted by the emulsion phase well mixing model was the best in accordance with the actual temperature distribution in the reactor.By adjusting the sections of the bubble phase and the number of CSTRs series,the model parameters were determined,one CSTR for the emulsion phase and 26 series CSTRs for the bubble phase.The temperature at the catalyst feed inlet rose rapidly （7 ℃）,but the temperature in the areas above the inlet increased slightly.Combined with polymerization kinetics,the model could predict the production rate and density of the polymer produced by the polymerization process.

关 键 词：气相乙烯聚合 流化床反应器 乳化相 气泡相 温度分布 模拟 

分 类 号：TQ054.1[化学工程]