An apparatus for removing solid particles from an exhaust gas of an internal combustion engine comprising a housing having an axis and provided with an inlet end for reception of said exhaust gas and an outlet end for communication with a centrifugal precipitator, said centrifugal precipitator having a tangential inlet at one end of a cylindrical part, said cylindrical part merges with a tapered body arranged to form a solid particle outlet, said cylindrical part further including an axis arranged to receive an immersion tube, said immersion tube arranged to extend into said cylindrical part and to carry away scrubbed gas, said housing further including an inner wall and high voltage means insulated from said housing, said high voltage means arranged to extend coaxially with said axis of said housing, and said high voltage means further includes disk means secured to said high voltage means and disposed seriatim and relatively close to one another and to said wall of said housing, said spray disk means being connected via said high voltage means with a first pole of a high-voltage source, and a second pole being connected to said housing, means including said inlet to said housing and the spacing between said disk means and said wall to produce a pronounced swirl in the exhaust gas between said disk means and said housing wall, said swirl having an average speed of more than 2.5 m/sec.