隔壁式空分精馏塔应用性能研究

为了降低空气低温分离过程的设备投资和能耗,在分析空分体系的热力学性质及流程特点的基础上,提出了一种新型的隔壁式空分精馏塔流程。应用Aspen Plus模拟软件,对空气分离的传统流程和隔壁塔流程进行了模拟对比,考察了隔壁式空分精馏塔各结构参数与操作参数对其年总成本的影响,并分析比较了空分传统流程和隔壁式空分精馏塔流程的热力学效率。结果表明,隔壁式空分精馏塔的建模合理可行,通过年总成本优化得到了该隔壁塔的最优结构参数与操作参数,分别为:液氧流量为3 kmol/h,气相分配比(体积比)为0.05,精馏段理论板数为33,侧线精馏段理论板数为30,公共提馏段理论板数为22。与传统空分流程相比,隔壁式空分精馏塔流程的有效能损失降低并且在热力学效率方面高出4.7%。

Application of air separation dividing wall column

In order to reduce the equipment investment and energy consumption of cryogenic air separation,a novel process of air separation dividing wall column(DWC) was proposed by analyzing the thermodynamic property and the process characteristics of the system.The new and the conventional processes were simulated with Aspen Plus.The effects of the structure and operational parameters of the air separation dividing wall column on the total annual cost(TAC) were investigated,and the difference of thermodynamic efficiency between the conventional air separation process and the air separation dividing wall column process was analyzed.The results show that the new modeling is workable.The optimal values of DWC for air separation are as follows: liquefied oxygen flow rate is 3 kmol/h,vapor split ratio(volume ratio) is 0.05,the theoretical plate number of rectifying section is 33,the theoretical plate number of side rectifying section is 30 and the theoretical plate number of stripping section is 22.Compared with the conventional process,the loss of available energy of the new process is lower,and the thermodynamic efficiency is 4.7% higher.