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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