HERCO in DRI plants

• SGRD (Seal Gas Refrigerant Dryer)

A  mechanical  cooling  system  to  dry  seal  gas comprised of mostly N2 and CO2  from  5-7  H2O  volume %  to  approximately  0.35 H2O volume % to be distributed  in  the  dry seal  gas network of the plant to be consumed in PDC (Product Discharge Chamber), product bins or wherever the customer needs inertization. At   the   time   being,  more   than  30  units  are  already   under operation  or  under  construction  for DRI  projects  with capacities between 2000 to 9500 Nm3/hr.

• PGD (Purge Gas Dryer)

Adsorption  dryers  with  molecular  sieve  beds to dry purge gas of the plant mostly  comprised  of  N2  and CO2 from 0.35% H2O volume % to very trace H2O  content  up  to -40˚C  dew  point. At  present  more  than  six units  are under   operation   or  under  construction  for  DRI  projects  with  capacities between 520 to 800 Nm3/hr.

• IAD ( Instrument Air Dryer)

A hybrid dryer comprised of a mechanical cooling system plus an adsorption system  equipped  with  molecular  sieve  beds  to  dry  instrument air  of the plant up to -40˚C dew point. At present two units are under operation in DRI plants with capacity of 500 Nm3/hr.

• SGAC (Seal Gas After Cooler)

It’s a heat exchanger to cool down seal  gas with direct or  indirect  water-gas contact via a shell and tube heat exchanger. At  present  four units are under operation in DRI plants with up to capacity of 12000 Nm3/hr.