November 2013

Cyber Security and Process Control

Update temperature control for a Claus unit with neural networks

The Natref oil refinery in Sasolburg, South Africa, had experienced refractory problems in the sulfur recovery unit’s (SRU’s) combustion chamber since startup (Fig. 1). Even though the SRU w..

Schabort, C. J., Neomagus, H. W. J. P., North-West University, School of Chemical and Minerals Engineering

The Natref oil refinery in Sasolburg, South Africa, had experienced refractory problems in the sulfur recovery unit’s (SRU’s) combustion chamber since startup (Fig. 1). Even though the SRU was at all times operated within the temperature range of 1,250°C to 1,750°C (as measured on the original thermocouples and the pyrometer), refractory failures occurred that could only be accounted for by temperatures in excess of 1,850°C. It was concluded that the available temperature indication was not an accurate reflection of the actual temperature in the combustion chamber.     Fig. 1. A refractory failure in the combustion   chamber of the SRU.

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