Exhaust Gas Washer / Dryer
A uniform velocity profile is essential for ensure that the dryer will work efficiently. The construction
constraints however make it very difficult t fulfill this requirement.
Simulations help determine the deviation from the ideal situation before actually installing the apparatus.
Optimisations can also be investigated to gauranty that everything is installed right the first time.
Courtesy of Munters Euroform GmbH.
Boiler House Ventilation
A boiler ventilation systems might implement mechanical components such as fans to force cooling air
through the boiler house. A more effective and reliable method is the use of natural convection (natural
ventilation). The design of such a system is based on key conditions:
- Black case
- Summer case
- Winter case
CFD simulations enable an exact determination of the neutral level and the required vent areas
below and above the neutral level.
The example given here shows the 50°C isosurface for the black case. The colours displayed on the
isosurface show the pressure distribution.
The stream lines show the flow regime. Eddies which might lead to hot spots can be located and avoided.
Courtesy of AeroTech Europe GmbH
Power = 350 MW
Particle size ca. 22 mm
Water content = 1,4%
Ash content =32,6%
Coal contant =65,9%
Volatile content =8,73%
Hydrogen = 2,1%
Carbon = 60,3%
Oxygen = 2,45%
Nitrogen = 1,12%
Sulphur = 1,43%
Swirl number of primary inlet = 2
Swirl number of secondary inlet = 1
The pictures show the burner configuration, the swirling flow coming into the combustion chamber and the
isosurface 1600°C. The concentration of ash is plotted on the isosurface.
Exhaust Gas Emission
This example shows the exhaust gas emission when considering a stably stratified atmosphere. The
wind direction is given by the vectors displayed.
The isosurface displays the position of 3% exhaust gas concentration. The volume within the
isosurface has a large exhaust gas concentration. The pressure distribution is plotted on the
isosurface. Hotter colours indicate higher pressure values. Thus the pressure near the chimney
is higher than further away from it.
Courtesy of RW-TÜV Anlagentechnik GmbH.