Application example 1

Gas expansion in a steel work.
A 4-cylinder gas expander with two-stage expansion was installed in a German steel work. The primary pre-heating upstream from the first stage is performed using operational hot water over a gas-water heat exchanger. 

Before entering the second expansion stage, the natural gas must be pre-heated again using a gas-water heat exchanger. After expanding the gas is discharged from the expansion motor at temperature of max. 10 °C. Since the heating agent hot water is only available with a capped temperature, the natural gas cannot provided at the desired temperature of 20 °C for use after the expansion. That is why it is again heated up over a downstream hot water-gas heat exchanger after being discharged from the expander.
gas expansion in steel works
Benefits for the customer

  • Cost saving by reduced external electricity purchase 
  • Efficient utilisation of excess heat energy 
Summary of system data 

Gas pre-heating 
Cooling water (hot water) from a furnace 

Spilling unit 
4-cylinder gas expander with 2-stage expansion 

Inlet pressure and temperature at motor 41.0 barg 
Outlet pressure and temperature at motor 0.5 barg
max. gas through put 14 000 Nm3/h
Generator terminal output 810 kW
Gas expansion
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