In view of low scrubber efficiency of venturi water film scrubbers currently wide used in medium and small thermal power plants

and problem of smoke emission often surpassed the standard limit

a technically retrofitting scheme of using combined dust-eliminating mode

which is composed of a two field electric precipitator and a venturi water film scrubber

has been put forward through simulation test study. The practical operation results show

this combined dust-eliminating mode needs low capital investment for retrofitting

and is easy to construct

the dust collecting efficiency of the two field electric precipitator being 99.4%

the combined dust-eliminating efficiency reached 99.9%

the smoke emission being below the standard limit specified by the state.