How to Compensate Pressure Changes in Temperature Control

Related Vendors

DÜPERTHAL Sicherheitstechnik GmbH & Co. KG

Elementar Analysensysteme GmbH

Glatt Ingenieurtechnik GmbH

Aker Solutions ASA

Pressure Control is Essential

Temperature control: Tower heat balance is maintained by controlling the pressure compensated temperature of the vapour stream of the column bottom tray. This controller resets the flow of low pressure steam to reboiler via direct acting flow controller.

This controller in turn achieves proper reboiler duty by adjusting the set point of condensate pot level controller, which exposes proper number of tubes and thus the proper amount of heat transfer surface for condensation in the reboiler.

Deisobutanizer Column–PCT–Control

Problem statement – Inferential temperature control is employed in Deisobutanizer which is separating isobutane from the mixture of butane and heavier hydrocarbons. Temperature transmitter is located at the first tray from the bottom in the column. Pressure compensation is provided to eliminate the effects of pressure variations in the column.

Pressure transmitter used for pressure compensation is also located at the bottom most tray. Correlation of pressure – temperature has to be developed and values of coefficients in the equation are to be determined.

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