FLUIDIZED BED SYSTEM

摘要

A fluidized bed system comprises a fluidized bed reactor, a solids separator and a return line and serves to carry out exothermic processes in a circulating fluidized bed. The system comprises lines for supplying oxygencontaining primary gases through the bottom of the fluidized bed reactor, lines for supplying oxygen-containing secondary gases on a level which is at least 1 meter above the bottom of the reactor but not in excess of 30% of the height of the reactor, and a fuel line, which opens into the fluidized bed reactor between the primary and secondary gas inlet means. In order to ensure a satisfactory transverse mixing of the oxygen-containing secondary gas and fuel particularly in reactors having large dimensions, the fluidized bed system is provided with one or more displacing body which covers or cover 40 to 75% of the bottom surface area of the fluidized bed reactor and has or have a maximum height that is equal to one-half of the height of the fluidized-bed reactor. The displacing body or bodies is or are preferably provided with means for supplying oxygen-containing secondary gases and/or have an upwardly decreasing cross-sectional area.