Agrawal分壁精馏塔分离芳烃的稳态和动态研究

发布时间：2018-03-02 13:14

  本文选题：Agrawal分壁精馏塔　切入点：稳态　出处：《石油学报(石油加工)》2017年06期 　论文类型：期刊论文

【摘要】：分壁精馏塔(Agrawal divided-wall column,ADWC)内部有上、下2个分隔壁,可实现四组分混合物的高纯度分离。建立了分离苯(Benzene,B)、甲苯(Toluene,T)、二甲苯(o-Xylene,X)和均三甲苯(1,3,5-Trimethylbenzene,H)的ADWC稳态严格精馏模型,经济优化后得到最优的塔体结构和操作参数。与常规三塔流程、Kaibel分壁精馏塔和强化Petlyuk分壁精馏塔进行能耗优势对比。结果表明,ADWC结构具有能耗和经济优势。与Kaibel分壁精馏塔相比,ADWC可节约10%左右的能耗和投资;与强化Petlyuk分壁精馏塔相比,ADWC结构简单并可在较少分离区域完成混合物的高效分离。稳态下全塔液相分布表明,在预分馏段内需实现甲苯和均三甲苯的清晰分割,中间塔段需要实现苯和二甲苯的清晰分割,主塔的上、中、下段分别完成苯和甲苯、甲苯和二甲苯、二甲苯和均三甲苯的清晰分割,在预分馏段和中间塔的底部二甲苯和甲苯略有返混现象。基于不同分气比下ADWC能耗和侧线组成分析结果,在Aspen Dynamic中建立了5×5的组分控制结构,该结构在发生±20%的流量和进料组成波动时,具有较优的控制效果。
[Abstract]:The high purity separation of four components mixture can be realized in the upper and the lower two fractions in the fractionation tower Agrawal divided-wall column. The ADWC steady-state strict distillation model was established for the separation of Benzenebrium, toluene Tolueneo, XyleneX and 1,335-TrimethylbenzeneH). After economic optimization, the optimal tower structure and operation parameters were obtained. Compared with the conventional three-tower process Kaibel fractionation tower and the reinforced Petlyuk fractionator, the results showed that the Kaibel structure had the advantages of energy consumption and economy. The energy consumption and investment of the fractionated distillation column can be reduced by about 10% compared with that of the fractionated distillation column. Compared with the enhanced Petlyuk fractionation column, the structure of Petlyuk is simple and the mixture can be separated efficiently in less separation area. The liquid phase distribution of the whole column shows that the separation of toluene and trimethylbenzene can be achieved clearly in the prefractionation stage. In the middle column, benzene and xylene need to be divided clearly. The upper, middle and lower sections of the main tower are divided into benzene and toluene, toluene and xylene, xylene and terylene, respectively. The mixture of xylene and toluene at the bottom of the prefractionation section and the middle tower is slightly reversed. Based on the results of energy consumption and side line composition analysis of ADWC at different gas fraction ratios, a 5 脳 5 component control structure is established in Aspen Dynamic. When 卤20% flow rate and feed composition fluctuate, the structure has better control effect.
【作者单位】： 华东理工大学化学工程联合国家重点实验室;
【基金】：国家自然科学基金项目(21476081) 上海市教育委员会科研创新重点项目(14ZZ058) 教育部基本科研业务费青年探索基金项目(WA1514306)资助
【分类号】：TQ028.31;TQ241
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本文编号：1556668