Patent ID: 7879294

Claim:
A fine solids recycle apparatus for a fluidized bed reactor, wherein the fluidized bed reactor comprises a fluidized bed region encased in a reaction vessel, at least one cyclone in fluid communication with the fluidized bed region for receiving a first gas-solid mixture which comprises fine solids particles, where the cyclone is connected to a dipleg through which the fine solids particles separated from the gas-solid mixture in the cyclone are collected, the apparatus comprising: an eductor connected to the dipleg, wherein the fine solids particles are removed from the dipleg, mixed with an eductor gas to form an eductor gas-fine solid particles mixture, which allows the return of the fine solids particles to the fluidized bed region; wherein the dipleg is arranged vertically, and a horizontal leg is provided to connect the dipleg with a solids inlet of the eductor; wherein gas and solids flow from the dipleg to the eductor is regulated to prevent gas in the eductor from reverse-flowing to the cyclone.