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Cracked Gases Separation

Cracked Gases Separation

5 days
PCH/VAPOFPP-E
Sessions
This course is not scheduled.
Who should attend?

Audience

    • Operating personnel in charge of steamcracker manufacturing complex: operators, control panel operators, supervisors and technical staff involved in the good working of units.

Level

  • Proficiency
  • This course provides a thorough understanding of the working principle of distillation columns implemented in a steamcracker.
  • It allows a greater control of the operation of these columns.
Learning Objectives
  • Upon completion of the course, the participants will be able to:
  • describe the circuits and the operation of the primary fractionation tower, water cooling tower quenching, the washing and drying system of cracked gases,
  • explain the impact of operating parameters of these plants through the main regulation systems,
  • adjust the tuning of the unit to the normal operation and to the upsets linked to the regulation system.
Course Content

BLOCK DIAGRAM OF THE STEAMCRACKER

0.25 day

  • Roles of the various sections: hot and cold sections, compression.
  • Feedstock origins, products types, yields.
  • Consequences of the column feedstock.

SEPARATION PROCESSES

2.5 days

  • Distillation, stripping and physico-chemical absorption. Common principle and main differences.
  • Operating parameters of a column with two products. Base of control, adaptation to the implemented regulation in the columns of the cold train.
  • Operating parameters of the various strippers and the column of wash.
  • Operating parameters of the column of absorption of acid gases.
  • Extractive distillation of C2 and C4 cuts: principle.
  • Operating parameters, base of control, adaptation of the operation to the implemented regulation.
  • Adsorption: principle.
  • Operating parameters, operation of the various dryers.

SPECIFIC CASE OF COLUMNS IN THE HOT ZONE

1.75 days

  • Primary fractionation column.
  • Influence of the compounds present in the feedstock.
  • Concentration profiles in the tower, possibilities of associated draw off, possible pumparounds, consequences on the operation.
  • Water quenching tower.
  • Role, behavior of a water-hydrocarbon mixture (immiscibility in the liquid state and specificities of the liquid-vapor equilibrium); Column driving and influence of the head temperature on the operation of the cracked gases compressor.

DISTURBANCES - INCIDENTS

0.5 day

  • Disturbances: shutdown of the furnace, loss of the quench circuit, loss of the flowrate in the quenching water circuit.
  • Cracked gas scrubbing incidents.
  • Failed regeneration of dryers.
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Ways & Means
  • Case studies in groups based on typical situations related to the operation of these units.
  • Possible participation of an experienced field operator to share its experience of the daily operation.