热泵精馏隔壁塔分离宽沸程物系的模拟

Simulation of vapor recompression assisted dividing wall column for wide boiling mixture separation

将中间换热和热泵精馏两种精馏节能技术应用到隔壁塔中,提出了带中间换热器的热泵精馏隔壁塔流程,以解决隔壁塔在分离宽沸程物系时出现的塔顶与塔底温差过高而不宜应用热泵精馏的问题。利用精馏塔总复合曲线图,可确定中间产品塔板采出流股的相态,从而得到不同类型的热泵精馏隔壁塔流程。宽沸程物系分离实例的模拟计算结果表明,该类流程在主塔气液相流量较大的情况下具有较高的节能效率。

Big temperature difference between the overhead and bottom of the dividing wall column （DWC） limited the application of vapor recompression technology into DWC for separating wide boiling mixture, so the DWC with vapor recompression at side product stage scheme is investigated in this paper. With the aid of CGCC profiles, the phase of stream withdrawn from side product stage can be determined, and the corresponding VRC assisted DWC schemes can be achieved. Simulation results for wide boiling mixture separation show that the 0roposed schemes have high energy efficiency under large vapor and liquid flow rate in the main column.