Delayed Coker

Details of three delayed coking APC training sessions follow (Four sessions if attendees have not taken the wide cut and narrow cut fractionation courses):

1. Coker operation and economics (100 minutes):

• Overview – the coking reaction.
• Feed and product: destinations, specifications and unit economics.
• Equipment configuration: Furnace, coke drums, main fractionator with total draw trays, gas plant, etc.
• The drum switch challenge.
• Manual labor considerations.
• Key handles: furnace flow, fresh feed flow (recycle ratio), drum inlet temperature.
• Fractionator handles: Top temperature, pumparounds, pump-downs from total draw trays, stripping steam.
• Gas plant handles: reboilers, reflux flows, absorber lean-oil, etc.
• APC requirements.

2. Inferential modeling (100 minutes):

Please note: If attendees have not taken the wide cut and narrow cut training there would be two sessions of 100 minutes each.

• Most inferential models cover fractionator products – see wide cut fractionation.
  • Product cutpoints, flashpoints, internal reflux at key points.
• Gas plant inferences – see narrow cut fractionation.
• Product purities, loading of key trays.
  • Modeling of coke drum fill rate.

3. Coker APC (100 minutes):

• Constraints and APC structure: CV’s, DV’s and MV’.s
  • In the furnace, fractionator and gas plant sections.
• The partially measured drum outage constraint (a throughput constraint).
• Drum switching control.
• Throughput maximization issues, cover the many constraints: furnace limits, heat removal, sometimes fractionator or gas plant hydraulic limits.