Distillation control for packed and trayed columns

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1 Citation (Scopus)

Abstract

In this work the dynamic behaviour and control of trayed and packed distillation columns are studied by rigorous modelling. First, the λ parameter to measure the interaction of the internal vapour and liquid flows is studied for packed columns. The calculated λ values predict severe controllability problems at higher internal flow rates close to flooding if the vapour flow is manipulated in a packed column. Secondly, open and closed loop simulations are carried out considering several control loop devices of different delays. The open loop simulations show that the packed column is significantly faster than the trayed column. On the other hand the closed loop simulations prove that average control loop delays have practically no influence on the dynamic behaviour of the trayed column due to the significantly higher process time constants. In the case of packed columns, however, the average control loop delays are the same order of magnitude as the process time constants. If fast response with dual composition control is needed it is mandatory to install advanced control loop devices for packed columns.

Original languageEnglish
Pages (from-to)139-145
Number of pages7
JournalHungarian Journal of Industrial Chemistry
Volume22
Issue number2
Publication statusPublished - 1994

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Distillation columns
Distillation
Vapors
Controllability
Flow rate
Liquids
Chemical analysis

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Chemistry (miscellaneous)

Cite this

Distillation control for packed and trayed columns. / Mizsey, P.; Fonyó, Z.

In: Hungarian Journal of Industrial Chemistry, Vol. 22, No. 2, 1994, p. 139-145.

Research output: Contribution to journalArticle

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