초록 ▼

In a fluidized bed reactor, nozzles are provided for distributing fluidizing gas from a windbox into the reactor while preventing the backflow of solid particles through the nozzle into the windbox. The nozzle defines an upper part of high heat and wear resistant material adapted to contact the mass

In a fluidized bed reactor, nozzles are provided for distributing fluidizing gas from a windbox into the reactor while preventing the backflow of solid particles through the nozzle into the windbox. The nozzle defines an upper part of high heat and wear resistant material adapted to contact the mass of particles. At least one opening is defined in each nozzle through which fluidizing gas passes between the upper part and the windbox, and a solid, though porous, material abuts or defines the opening for allowing the passage of gas while preventing passage of solid particles. The nozzle may comprise a stand pipe having a sintered metal portion disposed below the upper part. Other constructions provide the solid mass as a metal wire mesh acid proof filter, or as a porous ceramic material, or as a high temperature ceramic material. The solid mass may have pores with a pore size of between about 50-1,000 micormeters. The solid mass may be defined by a pair of concentric adjacent porous ceramic tubes with different effective gas permeabilities. A horizontal solid metal ring may have openings in it, with the ring supported above the windbox so that gas can flow through the openings, the porous solid material sandwiched between the upper part and the ring.

대표청구항 ▼

A fluidized bed reactor containing a mass of fine particles, and in its lower part a dispersion plate having a plurality of injection nozzles through which fluidizing gas is distributed from a windbox into the reactor, at least some of said injection nozzles comprising: an uppermost part of high hea

A fluidized bed reactor containing a mass of fine particles, and in its lower part a dispersion plate having a plurality of injection nozzles through which fluidizing gas is distributed from a windbox into the reactor, at least some of said injection nozzles comprising: an uppermost part of high heat and wear resistant material, on which the mass of particles would rest, being partially supported thereby, if the particles were subjected only to gravitational action, said uppermost part overlying any passageway from said windbox; means defining at least one opening in each injection nozzle through which fluidizing gas passes between said upper part and said windbox; and solid means substantially abutting said means for defining each said opening for allowing passage of gas therethrough but preventing passage of the particles therethrough.