Gas deficiency safety valve
Basic data:
Plant: Blast Furnace
Country: Germany
Investor: ALSTOM POWER BOILER, Stuttgart
Dimensions: 3000 (mm)
Problem:
The main aim was to secure the supply of all shut off and modulation dampers required for the blast furnace gas fired boiler unit 4 of the Mittelsbühren powerstation. The closing of the gas deficiency safety valve has to be fast and smooth to prevent further complications during power failure.
Solution:
We included in the order gas deficiency valve hydraulic actuator for valve opening and two counterweight arrangements. The actuator is equipped with a Siemens SP control system.
Results:
In the event of power failure or a loss of pressure in the gas supply main the valve can be closed within 5 seconds. In “ closed “ position, the sealing element fitted to the valve disc is brought into tight contact with a double landing bar in the casing. The cavity created in this position is pressurized by nitrogen.