隔板塔内部压力平衡及扰动维稳的探究

Research on pressure balance and disturbance stability of dividing wall column

隔板塔作为一种热耦合塔型,和常规多塔序列相比,具有显著的节能优势,并且能够降低设备投资和占地面积。但是如何协调隔板两侧的压力平衡,来维持隔板下侧分气比恒定是其设计的关键性难题,因为隔板塔运行期间分气比大多不可调整。本文基于已有文献,首先开发了一种进行隔板两侧压力平衡计算的方法,并且通过C++编程对填料塔及其塔内件进行了程序化,通过编程运行可以判别内件的可行性及优良性,同时获得了一系列塔的设计参数,对于隔板塔的概念设计和成本估算具有重要的指导意义。其次,通过上述程序的开发和验证,本文提出一种新型塔内件,以用于平衡隔板两侧的压降进而达到控制和动态调整分气比的目的。

As a type of thermal coupling tower, dividing wall column(DWC) has significant energy saving advantages compared with the conventional multi-tower series, and can reduce equipment investment and land area. It is a key point during the design phase of DWC on how to modulate pressure balance on both sides of the dividing wall to maintain the constant gas split ratio below the dividing wall, since that it is mostly impossible to adjust or control the gas split ratio uring operation. This paper develops a hydraulic method for calculating the pressure balance on both sides of the dividing wall through C++ programming. Hydraulic equations of packed tower and corresponding internals are programmed. The feasibility and excellentness of the internal parts can be verified by this program. At the same time, a series design parameters of DWC tower are obtained, which are important for conceptual design and cost estimation of DWC. This program can be used as a preliminary software for the design of packed DWC. Secondly, during the development and verification of the above procedures, a new type of tower internals is proposed for balancing the pressure drop across the dividing wall to achieve the purpose of dynamically controlling and adjusting the vapor split ratio.