... bell-type bubble cap, full membrane wall furnace; 3,insulated volute cyclone separator and U-shaped loop seal system 4,arrangement of ... cyclone separation ; 2,built-in bell-type bubble cap ; 3,fly-ash reinjection technology 4,elbow avoidance technology 5,technology ... and low discharge concentration of pollutants and environment-friendly 3,high efficiency of material separation and circulation rate 20% ...