September 2003

Instrumentation/Process Control

New control scheme improves SRU control

Sulfur emissions were reduced approximately 250 metric tons per year

Achieving the highest sulfur recovery unit (SRU) efficiency is becoming more relevant in the refining industry due to environmental restrictions in emissions limits. A new control scheme application increases tail gas H2S/SO2 controller accuracy by reducing variability of its deviation with respect to the setpoint. It uses a new algorithm that enables better use of the main and trim air to compensate for feed quantity and composition changes. Standard deviation is reduced five times compared with classical tail gas controllers and two times in relation to adaptive controllers. This algorithm has been successfully

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