Gas deficiency safety device
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. Moreover, it was essential to design a gas deficiency safety device to secure the safety of the plant.
Solution:
We designed toggle disc valve to serve this purpose. ply within 5 seconds when the gas pressure falls below 20mbar. Closing is achieved by means of two counterweights independent of external energy in compliance with the prevailing regulations. The valve is hydraulically opened. The hydraulic actuator is equipped with a Siemens SP control system. In the “closed “ position, the sealing element fitted to the valve disc is brought into tight contact with the double landing bar in the casing. The cavity created in this position is pressurized by nitrogen.
Results:
The valve automatically shuts off the gas supply within 5 seconds when the gas pressure falls below 20mbar. Moreover, because of its importance for the safety of the plant the valve has been DVWG approved.