초록 ▼

An arrangement for fine dust separation in a fluidized bed reactor with a cyclone and dust return conduit. A venturi tube extends from the solids discharge of the cyclone intermediate the cyclone and the dust return conduit, and a gas injector is located at the inlet of the venturi tube. The fine du

An arrangement for fine dust separation in a fluidized bed reactor with a cyclone and dust return conduit. A venturi tube extends from the solids discharge of the cyclone intermediate the cyclone and the dust return conduit, and a gas injector is located at the inlet of the venturi tube. The fine dust which leaves the fluidized bed is separated from the exhaust gas in the cyclone, and the separated dust is conducted from the cyclone, through the venturi tube and the dust return conduit, and into the lower region of the fluidized bed. Gas is conducted through the gas injector to help force the separated dust through the return conduit and into the fluidized bed.

대표청구항 ▼

A fluidized bed reactor comprising: a body holding a bed layer including upper and lower halves and means for introducing a fluidizing medium to fluidize the bed layer; a cyclone for separating granular material from a gas, and including an inlet in communication with the fluidized bed layer for rec

A fluidized bed reactor comprising: a body holding a bed layer including upper and lower halves and means for introducing a fluidizing medium to fluidize the bed layer; a cyclone for separating granular material from a gas, and including an inlet in communication with the fluidized bed layer for receiving gas and entrained granular material therefrom, a gas outlet for discharging separated gas, and a solids outlet for discharging separated granular material; a material return conduit in communication with the solids outlet of the cyclone and extending into, and having a bottom outlet in, the lower half of the fluidized bed layer for conducting separated granular material from the cyclone, into the lower half of the fluidized bed layer; a venturi constriction connected to and located between the cyclone and the material return conduit, and having an inlet in fluid communication with the solids outlet of the cyclone, and an outlet in fluid communication with the material return conduit to conduct granular material from the cyclone and into the material return conduit; and gas injection means connected to and extending into the cyclone and having a discharge opening located above the venturi constriction for directing a gas stream through a lower portion of the cyclone and into the venturi constriction to develop and maintain at the inlet of the venturi constriction, a fluid pressure greater than the fluid pressure at the bottom outlet of the material return conduit to assist conducting the separated granular material from the cyclone, through the venturi constriction and the material return conduit, and into the lower half of the fluidized bed layer, and to prevent gases from passing upward through the material return conduit and into the cyclone from the lower half of the fluidized bed layer.