TITLE: VENTILATION IN A GAS TURBINE PLANT - A HAZARD ANALYSIS STUDY
BY: P J Phelps & D R Glynn, FLOWSOLVE. Tel: +44 181 944 0940
FOR: IVO GENERATION SERVICES / REGIONAL POWER GENERATORS LTD
- Hazard analysis study for a gas-turbine power plant.
- Accidental gas release may contact hot surfaces, resulting in an
- Ventilation provided to dilute and disperse hazardous gas releases.
- Safety requirement is that ventilation must keep critical gas
concentration envelope below a defined size.
- Aim of CFD study is to assist in evaluation of alternative
ventilation strategies to ensure compliance.
- The next panel shows the geometry.
- Air enters through the green rectangular regions from the adjoining
- Turbine casing and exhaust box are hot.
- Assumed leak location is shown.
- Model features - 3D steady, cartesian grid, ASAP, buoyancy.
(2) VELOCITY VECTORS ON VERTICAL PLANE THROUGH LEAK
The buoyant plume driven by the hot casing dominates the flow.
(3) CRITICAL CONCENTRATION CONTOUR ENVELOPE
The isosurface of gas concentration at 50% of LEL (lower explosive
limit) is shown, for a given ventilation strategy.
The volume contained within this envelope is evaluated automatically
by the model, for comparison with the safety requirement.
CRITICAL CONCENTRATION CONTOUR ENVELOPE
For further details see the May 1997 issue of Phoenics News.