Taking air-water combined slag-cooler of a 450 t/h CFB boiler in one powr plant as the test prototype

a visual cold-state test facility has been set up in a proportion ratio of 1:5.Adopting slag discharged from actual boiler as bed material in the test

a cold-state test study on behavior of slag passing through selective chamber of a fluidized bed slag-cooler has been carried out.Results of test show that the critical fluidized air velocity of ash-slag particles is linearly increasing in proportion with the particle size;under certain velocity of the fluidized air

the slag passing rate through selective chamber has strong selectivity with particle size

regulation of the fluidized air velocity in the selective chamber can effectively control the distribution of particles entering into the cooling chamber.This behavior of selectivity can effectively be used as a guide for designing the selective chamber of a slag-cooler

and for practical operation of the slag-cooler.