Patent ID: 7972562
Filing Date: 2011-07-05
Classification: B01J,C01B

Abstract:
1. A high-pressure fluidized bed reactor for preparing granular polycrystalline silicon, comprising: (a) a reactor tube; (b) a reactor shell encompassing the reactor tube; (c) an inner zone formed within the reactor tube and an outer zone formed in between the reactor shell and the reactor tube, wherein a silicon particle bed is formed and silicon deposition occurs in the inner zone while a silicon particle bed is not formed and silicon deposition does not occur in the outer zone; (d) an inlet means for introducing gases into the silicon particle bed; (e) an outlet means comprising a silicon particle outlet means and a gas outlet means for discharging the polycrystalline silicon particles and off-gas out of the silicon particle bed, respectively; (f) an inert gas connecting means for maintaining a substantially inert gas atmosphere in the outer zone; (g) a pressure controlling means for measuring and/or controlling the inner zone pressure (Pi) or the outer zone pressure (Po); and (h) a pressure-difference controlling means for maintaining the value of |Po−Pi| within the range of 0 to 1 bar.