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[sargon 1979]

Hi all;

I have a problem with dehydration unit (Molecular sieve beds, two in adsorption, one in regeneration with 16 hrs adsorption cycle), your help is highly appreciated;

The problem is:

Dehydration unit is designed to handle (172935 Nm3/hr) at inlet temperature of (27ْC) and pressure (84 barg), the inlet temperature is achieved by means of Propane evaporator now, chiller unit is stopped due to mechanical damage (No standby is available).

upstream of chiller there is an air cooler but the minimum obtained outlet temperature is only 35ْC (35ْC to 50ْC normally). the inlet water content is increased (650 ppmv to 1200 ppmv), i suggested to bypass a slip stream of the inlet gas (60000Nm3/hr) and dehydrate a quantity of (113000 Nm3/hr) so that the water load on the unit remains constant.

I'm not sure about my solution because I'm sure that the capacity of the unit differs with temperature.

 

Thank you very much