As is well known from the literature, the cleaning efficiency of a venturi scrubber improves with the amount of liquid added
per volume of gas and with increasing gas velocity in the throat. However, high gas velocities and high charges of washing liquid
cause a large pressure drop. Hence, the separation efficiency and energy consumption of the scrubber have to be optimized. It is
shown that the separation efficiency could be improved by a multistage injection of the washing liquid. Due to the self-priming
operation, the separation efficiency remains at a high level even if the gas velocity decreases, and thus requires no regulation from
the outside.