March 2009

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HP Control: CDU overhead double-drum configuration

Fig. 1 shows one of many CDU overhead configurations, with naphtha cutpoint control accomplished by a column top temperature controller manipulating a top pumparound (TPA) circuit heat removal. This c..

Friedman, Y. Z., Petrocontrol

Fig. 1 shows one of many CDU overhead configurations, with naphtha cutpoint control accomplished by a column top temperature controller manipulating a top pumparound (TPA) circuit heat removal. This configuration is heat efficient although heat efficiency comes at the expense of top section separation. The TPA internally uses four trays, not for separation, but for internal condensing and heat transfer.  Fig. 1    Single-drum overhead. To regain those lost trays process designers often specify two overhead drums per the configuration of Fig. 2. Heat previously removed by th

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