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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 sulfur recovery. ABC provides that. It is clearly superior over conventional SRU control and has always been Jacobs 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 analyzer 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 Sulfur Recovery Efficiency (SRE), can be avoided.

Other Literature

Plant control - advanced burner control (plus)

Applications: The design intent is to have accurate SRU tail gas quality control in order to optimize sulfur recovery. ABC provides that. It is clearly superior over conventional SRU control and has always been Jacobs Comprimo®’s control system of choice for the EUROCLAUS®/SUPERCLAUS® ...


Sulfur recovery - claus process

Applications: The Claus process has been developed to recover elemental sulfur from H2S containing gases originating from gas treating plants such as alkanolamine units or physical solvent plants. Modern Claus plants should be able to process H2S/NH3 containing gases as well, originating from Sour Water ...


Sulfur recovery - EUROCLAUS® process

Applications: The EUROCLAUS® process recovers elemental sulfur from H2S-containing gases originating from gas treating and sour water stripper plants. The EUROCLAUS® process is an improvement of the SUPERCLAUS® process. Yields from 99.3 up to 99.5% overall sulfur recovery, without any further ...


Gas treating (refinery / natural gas) ADIP process

Applications: The ADIP process is a regenerative process developed to selectively reduce H2S in gas to very low concentrations in the presence of CO2. The ADIP process uses an aqueous solution of diisopropanol amine (DIPA) or the aqueous solution of methyldiethanol amine (MDEA). MDEA is used for those ...


Liquid hydrocarbon treating (LPG/PP/BB) - ADIP process

Applications: Besides its use as a regenerative process for the reduction of H2S to very low levels in gases, the ADIP process is also used to selectively reduce H2S and COS to very low levels in liquid hydrocarbons, such as propane-propylene (PP), butanebutene (BB), LPG and NGLs. The process is based ...


Claus tail gas treating - low temperature SCOT process

Applications: The Shell Claus Off -gas Treating (SCOT) process has been developed to remove sulfur compounds from Claus tail gas to comply with stringent air emissions regulations. The conventional SCOT process is able to easily meet less than 250 ppmv total sulfur in the SCOT off gas, which corresponds ...


Claus tail gas treating - SCOT process

Applications: The Shell Claus Off -gas Treating (SCOT) process has been developed to remove sulfur compounds from Claus tail gas to comply with stringent air emissions regulations. The standard SCOT process is able to easily meet less than 250 ppmv total sulfur in the SCOT off gas, which corresponds ...


Sulfur recovery - subdewpoint - SUPERCLAUS® process

Applications: The SubDewPoint (SDP)-SUPERCLAUS® combi-process is a convenient solution for existing SDP units to increase the overall sulfur recovery to at least 99.5% without any further tail gas clean up.

Description: The SDP-SUPERCLAUS® process adds the selective oxidation stage ...


Sulfur handling - Shell sulfur degassing process

Applications: The Shell Sulfur Degassing Process has been developed to remove H2S and H2Sx from liquid sulfur eliminating potential toxic and explosion hazards associated with handling, transport and storage of liquid sulfur. Elemental sulfur produced by the Claus process contains both physically dissolved ...


Sour water stripper

Applications: Many process units throughout a refinery generate significant quantities of sour water. Sour water collected within a refinery contains both H2S and NH3. These components are present as ammonium hydrosulfide (NH4HS) within the sour water. NH4HS is the salt of a weak base and a weak acid. ...