Figure 1 - The lance system consists of air pipes directed to a region in the liquid jet created by side-entry mixers
The performance of the lance system is influenced by the energy of the fluid jet (mixer power) and the submergence depth (air blower power). The performance of the sparge grid is less dependent on the mixer power and is, to a much greater degree, influenced by submergence depth. When upgrading an existing wet FGD, a general review of the capacity available in the existing absorber recirculation tank is required. In some cases, a sparge grid or lance system can be retrofit into the existing tank. If there is not enough residence time available, an external oxidation air tank may be required.
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