Bag filters can be used for collection of particles if the gas temperature is lower than 200 C.
Sometimes bag filters are more economical than the ESP.
Venturi scrubbers are used for particulate removal as well as the gas cleanup. If gases
contain some acidic gases like HCl or HF or even SO2, these can be removed by the basic liquid or water used in the scrubber together with the Particulates.
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