Method for washing incineration ash and dust contained in extracted cement kiln combustion gas

Abstract

To minimize harmful effects on operation due to scale adhesion while accommodating increase in the amount of generated chlorine bypass dust and suppress facility cost and running cost including medical agent cost low when incineration ash and dust contained in extracted cement kiln combustion gas are subject to water treatment. [Means for Solving Problems] A water treatment systemcomprising: a dissolution tankfor dissolving a fly ash A in a water W; a dissolution tankfor dissolving a dust D contained in combustion gas extracted from a kiln exhaust gas passage running from an inlet end of a cement kiln to a bottom cyclone in a water W; and a vertical filter pressfor separately filtering a slurry Sfed from the dissolution tankand a slurry Sfed from the dissolution tankfrom each other. It is possible to install water treatment facilities-for a filtrate Lof the slurry containing fly ash discharged from the vertical filter press, and water treatment facilities-for a filtrate Lof the slurry containing ash discharged from the filtering device.