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Plant control - advanced burner control (plus)

Applications: The design intent is to have accurate SRU tail gas quality control in order to optimize sulphur recovery. ABC provides that. It is clearly superior over conventional SRU control and has always been Comprimo’s control system of choice for the EUROCLAUS®/SUPERCLAUS® process with over 200 licenses worldwide.
 
ABC handles changes to SRU feed gas variables such as flow rate, pressure, temperature and composition, provided these changes are relatively small. Bigger changes need correction by tail gas quality control, which is slow by nature due to the location of the tail gas analyser at the back of the SRU. Typically ABC is to be applied when major changes to one or more SRU feed gas variables, and especially the composition, are not expected.

Description: Combustion air to SRU main burner is continuously adjusted to
correct for changes in SRU feed gas flow rate, pressure, temperature
and composition. ABC copes with these aspects as follows (refer the scheme):
» feed gas flow rate changes are controlled by feed-forward ratio
» feed gas pressure changes are controlled by SRU feed gas header pressure control, while feed gas flow rate is
compensated for pressure fluctuations
» feed gas temperature changes are controlled by process units upstream SRU, while feed gas flow rate is compensated for
temperature fluctuations
» feed gas composition changes are controlled by tail gas quality control.

ABC controls the main and trim air valves simultaneously, which provides a direct and accurate response. The total air flow controller manipulates the small and accurate trim air valve. The trim valve position controller monitors the trim valve position and acts on the main air valve to keep the trim air valve within operating range.

ABC uses only a common air flow transmitter, thereby reducing cost while improving control robustness and providing a
more accurate combustion air flow measurement.

A change in SRU feed gas composition actually requires a change in air to feed gas ratio control, which is manually set by the operator. However, in case the manual air to feed gas ratio deviates from actual then tail gas quality control within ABC effectively adjusts the air to feed gas ratio in order to provide the correct combustion air demand. The modified air to feed gas ratio then remains valid as long as the SRU feed gas composition does not change again, meaning that subsequent SRU feed flow changes are directly processed with the modified air to feed gas ratio. This way continued corrections by tail gas quality control, and thus sub-optimal operation leading to reduced Sulphur Recovery Efficiency (SRE), can be avoided.

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