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.