When water evaporates, substances such as salts or silicates which do not pass into the steam remain in the boiler water. The boiler water in the pressure vessel thus continuously increases in concentration. This concentrated boiler water must be blown down regularly to prevent corrosion and deposits in the pressure vessel.
First condensate is boiler water entrained in the steam that is discharged from the steam pipe in the steam dryer.
Both the blow-down water and the first condensate are pressurised and have steam temperature. In the blow down vessel, blow-down water and first condensate are relaxed and cooled before they may be routed into the waste water system.
The advantages for you
- High operational reliability through connection to boiler control
- Utilisation of the thermal energy in the blow down water for feed water pre-heating
- Cooling water consumption is reduced by utilising the thermal energy and through delayed draining
- A water level indicator increases operational reliability
- Reduced-noise blow down possible
- Good accessibility for maintenance