what is a wet scrubber
It is going to be a bit of an estiamte. You can not model the injection of the liquid phase (assuming it is a liquid since you said wet). You can model the gas part without the injection then use the particle studies to see where the injection atomized liquid will disperse. Maybe that is good enough. If it all ends up as gas phase eventually you could inject gas to account for the increased mass flow rate. The code has no ability to do the chemistry.