Design of dust-containing exhaust gas scrubber

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I seek advice from experts on the design of a dust-containing exhaust gas scrubber. Operating condition: A sodium salt that is dried using a pneumatic dryer; after drying, the hot air passes through a cyclone separator to capture most of the dust, and the dust-containing exhaust gas is then washed in a two-stage spray scrubber to remove the dust from it. Sodium salt dust is readily soluble in water. The spray washing tower uses a random-packed filler tower. The overall dust removal efficiency of the Level 2 scrubber is required to be >99%. First question: The diameter of the packed tower is determined based on the gas velocity in an empty tower. What value should the gas velocity in an empty tower be set at to ensure effective washing? Second question: How to determine the height of the bulk packing? For example, with packing lengths of 1m, 2m, 3m, and 4m, how much is needed to ensure an effective washing effect?