June 2008

Columns

HP Control: Condenser hot vapor bypass control

What is the worst mistake? It is the one that is repeated in practically every refinery, and yet, we haven't managed to learn from it. I have chosen to discuss the very simple distillation column pres..

Friedman, Y. Z., Petrocontrol

What is the worst mistake? It is the one that is repeated in practically every refinery, and yet, we haven't managed to learn from it. I have chosen to discuss the very simple distillation column pressure control by partial flooding of the condenser. This method is used often when the column overhead vapor is totally condensed into the accumulator. As illustrated in Fig. 1, a valve is placed on the condenser outlet to create a flow restriction and build up liquid level inside the condenser. As level rises, condensing area shrinks and then the column pressure starts trending up. And vice versa, upon draining the condenser, condensing area increases and pressure starts trending down. This con

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