The Investigation On Separation Performance Of Cyclone Separator Used In The Circulating Fluidized Bed Boiler

These experiments according to the characteristics of fluidize-suspension burning of coal water mixture in circulating fluidized bed boiler, the effects of operation parameters and physical property of particle on separation performance were studied by measuring separation performance of cut-in style cyclone separator used in the circulating fluidized bed boiler under different operation parameters. Based on the measured results, separate efficiency will appear the biggest value when inlet air velocity and particle concentration increase; separationperformance will increase along with increase of particle size when particle size is more difference, the effect of concentration of inlet particle to separation performance will distinctwhen inlet particle size is similar.The distribution of gas flow field and particle concentration in the cut-in style cyclone were measured with five-orifice pitot tube and by means of isokinetic sampling method,analyze influence of flow field and particle concentration to separation performance of cyclone. Based on the measured results, portrait circumfluence and stagnation velocity layerin annulus space can result in top ash loop; there is a short circuit flow near the bottom of the vortex finder, which can carry the particle out directly; near the dust discharge port, in the section of the cone of the separator there is a re-entrainment of small particle by rise air. Allof them can lower the efficiency of the cyclone separators. All results above provided a base for further research on the cut-in style cyclone separator used in the circulating fluidized bed boiler and design of structural parameter of cyclone separator.