Alden has experience modeling a wide range of flue gas desulfurization (FGD) technologies including:
- Open spray towers
- Tray towers
- Spray drier absorbers
- Venturi scrubbers
- Weir Scrubbers
- Limestone injection systems
We use physical and computational flow modeling techniques to evaluate the fluid flow characteristics within the FGD system. If required, we develop design modifications to:
- Ensure optimum gas flow and thermal distributions both entering and within the absorber module
- Minimize the potential of liquid pull back into the inlet duct
- Minimize system pressure losses
- Ensure the flow distributions entering booster fans meet fan manufacturer specifications
As part of these studies, Alden develops flow controls in the model to ensure the flows entering the FGD system meet the levels of uniformity specified by the WFGD system supplier. Where appropriate, we evaluate flyash drop out in the inlet ducting and develop methods to ensure that accumulations are minimized.
Investigations are made within the FGD modules themselves. In wet flue gas desulfurization systems, the gas and liquid flow distributions can be evaluated to maximize sulfur capture and optimize mist eliminator performance. We typically perform evaluations in a reduced scale physical flow model in which the liquid to gas flow momentum exchange ratio has been accurately reproduced. In dry flue gas desulfurization systems, the dispersion and mixing of slurry flows within the absorber tower can be evaluated and modifications developed to enhance spray/flue gas mixing while minimizing wet spray contact with the reactor walls.
For all FGD systems, both the inlet and outlet ducting arrangements can be evaluated and optimized for both process and pressure drop related issues.
