Furnaces – Including noncombustible fluid supply means – Hollow grate
Patent
1988-05-26
1989-06-27
Favors, Edward G.
Furnaces
Including noncombustible fluid supply means
Hollow grate
34 57A, 110245, 16510416, 431170, 239DIG19, F23H 300
Patent
active
048418846
ABSTRACT:
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.
REFERENCES:
patent: 3818606 (1974-06-01), Marcellini
patent: 3933445 (1976-01-01), Mueller et al.
patent: 4257171 (1981-03-01), Johnson et al.
patent: 4387667 (1983-06-01), Goodstine et al.
patent: 4510874 (1985-04-01), Hasenack
patent: 4565136 (1986-01-01), Nakamura
patent: 4628868 (1986-12-01), Eaton
"Pall Porous Metal Filter Media", brochure, admitted prior art.
"Hi-Tech Ceramics Inc.", brochure, admitted prior art.
"Cerapor", brochure, admitted prior art.
"Public Use Drawings", of nozzle believed to have been publicaly used in the United States.
Engstrom Folke
Kuivalainen Reijo
A. Ahlstrom Corporation
Favors Edward G.
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