First Gas Dehydration Unit at Feromihin production

As a superstructure of rich experience in installation, maintenance and servicing of hydrocarbon transport system equipment, Feromihin d.o.o. has produced a GAS DEHYDRATION UNIT that will soon be installed at the new underground gas storage under construction – PSP Grubišno polje.

The manufactured GAS DEHYDRATION UNIT using TEG serves to remove residual moisture from the gas before it enters the “Plinacro” transport system and consists of three parts:
1. Dehydration column and cooler of dry TEG,
2. Regeneration skid, and
3. Pumps and condenser skid.

Natural gas from gas wells after rough separation of water and condensate is sent to a unit to remove residual moisture. Dehydration of the gas is carried out using triethylene glycol (TEG) in the dehydration column by counter-current movement of natural gas from the bottom of the column and TEG (which serves to separate moisture from the gas) from the top of the column. The dehydrated (dry) gas leaves the dehydration unit and is sent to the “Plinacro” transport system, while the moisture-saturated TEG is sent to the regeneration unit.

In regeneration, TEG is heated using an exchanger and a TEG boiler (reboiler)*, which is also an accumulator of dry TEG and contains a stripping system that ensures the required TEG purity of min. 99.7% wt.
Due to the very strict permitted emissions into the atmosphere, the vapor from the reboiler is cooled and the remaining gas is separated from it by additional separation, which is used as fuel gas for the reboiler burner.

The unit is designed for two phases of production:
1st phase – extraction of part of the acquired gas reserves from the Grubišno Polje gas reservoir/field. (max. gas flow of 15,000 Sm3/h) i
2nd phase – after the construction of the peak underground gas storage in the partially depleted Grubišno Polje gas field (max. gas flow 100,000 Sm3/h)

It should be noted that the manufactured unit is a “Croatian product” in which domestic knowledge and experience (know-how) is incorporated with a large proportion of installed equipment from Croatian manufacturers.
In addition to the company Feromihin, d.o.o. in whose production hall the package unit was assembled and tested, domestic companies SCAN projekt d.o.o., MONTER – STROJARSKE MONTAŽE d.d. participated in the production and TPK OROMETAL d.o.o. as well.

The planned installation of the unit is in the third quarter of 2022, and commissioning in the first quarter of 2023.

*reboiler in which it is “boiled” until water vapor appears, which is separated from the TEG by gas stripping.)

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