Distributor plate for fluidized bed reactor

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 upper part of high heat and wear resistant material, adapted to contact the mass of particles;
• means defining at least one opening in each injection nozzle in a downwardly extending portion of said upper part, through which opening 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.

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 upper part of high heat and wear resistant material, adapted to contact the mass of particles;
• 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, comprising a pair of concentric adjacent porous ceramic tubes with different effective gas permeabilities.

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 upper part of high heat and wear resistant material, adapted to contact the mass of particles;
• means defining at least one opening in each injection nozzle through which fluidizing gas passes between said upper part and said windbox;
• solid means substantially abutting said means for defining each said opening for allowing passage of gas therethrough but preventing passage of the particles therethrough;
• and
• said means defining said openings comprising a horizontal solid metal ring having openings therein, and means supporting said ring above said windbox so that gas can flow through said openings, with said solid means sandwiched between said upper part and said ring.

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 upper part of high heat and wear resistant material, adapted to contact the mass of particles;
• an outer part having means defining openings for fluidizing gas therein;
• and
• an inner part having means defining inner openings therein for fluidizing gas, said inner openings smaller than said outer openings and said inner part essentially in contact with said outer part so that little or no free space is formed in between the inner and outer parts for solid particles to accumulate so that fluidization of gas occurs but backflow of solid particles through the nozzles into the windbox does not.

An injection nozzle for a fluidized bed reactor containing a mass of fine particles, comprising:

• an uppermost part of high heat and wear resistant material, adapted to contact the mass of particles in the fluidized bed reactor;
• means defining at least one opening in a downwardly extending portions of said uppermost part, through which opening fluidizing gas passes;
• and
• solid means substantially abutting said means for defining said opening for allowing passage of gas therethrough but preventing passage of the particles therethrough.

An injection nozzle for a fluidized bed reactor adapted to contain a mass of fine particles, comprising:

• an upper part of high heat and wear resistant material, adapted to contact the mass of particles in the fluidized bed reactor;
• means defining at least one opening through which fluidizing gas passes;
• and
• solid means comprising a pair of concentric adjacent porous ceramic tubes with different effective gas permeabilities, substantially abutting said means for defining said opening for allowing passage of gas therethrough but preventing passage of the particles therethrough.

An injection nozzle for a fluidized bed reactor adapted to contain a mass of fine particles, comprising:

• an upper part of high heat and wear resistant material, adapted to contact the mass of particles;
• means defining at least one opening in said injection nozzle through which fluidizing gas passes;
• solid means substantially abutting said means for defining said opening for allowing passage of gas therethrough but preventing passage of the particles therethrough;
• and
• said means defining said at least one opening comprising a horizontal solid metal ring having openings therein, and means supporting said ring so that gas can flow through said openings, with said solid means sandwiched between said upper part and said ring.