Új kétoszlopos szakaszos nyomásváltó rektifikáló rendszer üzemeltetése és szabályzása

Kopasz, Á. and Modla, Gábor and Láng, Péter (2009) Új kétoszlopos szakaszos nyomásváltó rektifikáló rendszer üzemeltetése és szabályzása. In: Műszaki Kémiai Napok'09. Pannon Egyetem, Veszprém, pp. 129-135. ISBN 978-963-9696-68-6

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Abstract

When operating the DCBS (and DCBR) configuration(s) the liquid composition of the common vessel of the two columns must be kept between the two azeotropic compositions with affecting the flow rates of the two products. These can be varied by changing the reboil ratio and/or ratio of division of the liquid flow leaving the common vessel. The goals of this paper: -to propose and study a simple control scheme with PID parameters (providing good quality of control) for the new configuration, -investigation of the influence of the liquid division ratio, -determination of optimal value of liquid division ratio (providing the prescribed separation with minimal specific energy consumption). The calculations were made for a minimum (n-pentane - acetone) azeotropic mixture by using a professional dynamic simulator (CCDCOLUMN). By the aid of a PID controller we modified the flow rate of the bottom products (affecting the reboil ratios of the columns). We investigated the action of the control loops and the system for two different set points. In the first case the composition of the bottom products, in the second one – most common in the industry- the bottom temperatures were kept constant.

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