Pneumatic bark distributor for continuous ash discharge stokers

F - Mech Eng,Light,Heat,Weapons – 23 – K

Patent

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Details

F23K 3/18 (2006.01) F23B 30/08 (2006.01)

Patent

CA 2240725

A furnace (10) having a continuous ash discharge stoker (12) which includes a fuel distributor apparatus (70) for delivering particulate fuel to the furnace (10) which includes a housing (72) having an inlet (42) for a particulate fuel and an inlet (76) for pressurized air. The housing includes a surface (86) for directing the flow of the particulate fuel and an outlet cooperating with the surface through which the associated particulate fuel and air exit the housing. The apparatus includes a nozzle (80) dimensioned and configured to direct pressurized air along a face of the surface to establish a boundary layer between the surface and the particulate fuel flowing over the surface. The nozzle comprises first (74) and second (82) flat plates disposed in mutually parallel spaced relationship, and aligned to at least a portion of the surface. Apparatus (70) includes an elongated outlet plate and the surface is on the elongated outlet plate. The outlet plate may pivot on an axis (88) proximate to the outlet of the nozzle, and may have an axially tapered ramp (90) at the end of the outlet plate remote from the nozzle. The inlet for pressurized air may include a plenum chamber (78).

Un four (10) comprend un dispositif de décharge de cendres en continu (12) qui inclut un distributeur (70) de combustible chargé dalimenter le four (10) en éléments de combustible solide, et enceinte (72) dotée d'une entrée (42) destinée à un combustible donné, et d'une entrée (72) d'air sous pression. L'enceinte présente une surface (86), qui oriente l'écoulement des éléments de combustible, et une sortie coopérant avec cette surface et au travers de laquelle l'ensemble constitué par les éléments de combustible et l'air sort de l'enceinte. Le distributeur comprend un ajutage (80) dimensionné et configuré pour orienter l'air sous pression le long d'un côté de la surface afin d'établir une couche limite entre cette surface et les éléments de combustible la parcourant. Cet ajutage présente deux plaques planes (74, 82) séparées et parallèles qui sont alignées sur aux moins une partie de la surface. Ce distributeur (70) comporte une plaque de sortie allongée, où est située ladite surface, pouvant pivoter autour d'un axe (88) proche de la sortie de l'ajutage et présenter une rampe axiale (90) disposée à l'extrémité de cette plaque de sortie opposée à l'ajutage. L'entrée d'air sous pression peut comporter une chambre de plénum (78).

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