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1. (WO1998048932) PULSED FLUIDISED BED
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/048932 International Application No.: PCT/CA1998/000399
Publication Date: 05.11.1998 International Filing Date: 28.04.1998
Chapter 2 Demand Filed: 30.11.1998
IPC:
B01J 8/16 (2006.01) ,B01J 8/40 (2006.01) ,F23C 10/18 (2006.01) ,F26B 3/092 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
8
Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
16
with particles being subjected to vibrations or pulsations
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
8
Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
18
with fluidised particles
24
according to "fluidised-bed" technique
40
with fluidised bed subjected to vibrations or pulsations
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23
COMBUSTION APPARATUS; COMBUSTION PROCESSES
C
METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR
10
Apparatus in which combustion takes place in a fluidised bed of fuel or other particles
18
Details; Accessories
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
26
DRYING
B
DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
3
Drying solid materials or objects by processes involving the application of heat
02
by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
06
the gas or vapour flowing through the materials or objects to be dried
08
so as to loosen them, e.g. to form a fluidised bed
092
agitating the fluidised bed, e.g. by vibrating or pulsating
Applicants:
HER MAJESTY IN RIGHT OF CANADA, as represented by THE MINISTER OF NATURAL RESOURCES [CA/CA]; 580 Booth Street Ottawa, Ontario K1A 0E4, CA
Inventors:
KUDRA, Tadeusz; CA
GAWRZYNSKI, Zbigniew; PL
GLASER, Ryszard; PL
Agent:
WILKES, Robert, A. ; Suite 2001 112 Kent Street P.O. Box 3440, Station D Ottawa, Ontario K1P 6P1, CA
LAUFHUTTE, Dieter; Lorenz, Seidler, Gossel Widenmayerstrasse 23 D-80538 München, DE
Priority Data:
9708600.329.04.1997GB
Title (EN) PULSED FLUIDISED BED
(FR) LIT FLUIDISE PULSE
Abstract:
(EN) An apparatus and method for processing materials in a batchwise or continuous fluidised bed (10), such as a drier, in which the fluidised bed is subdivided into a plurality of smaller areas (20), to each of which two separately controlled gas flows are provided. The first lower gas flow is provided to the bed preferably all of the time, and is sufficient at least to maintain the bed in an expanded state. The second higher gas flow is provided to each separate area of the bed in sequence by means of a rotary valve arrangement (21A, 22A, 23A, 24A), and is high enough to induce fluidisation in the bed, but not high enough to induce significant solids loss by entrainment in the offtake gas. The higher flow sequence can be chosen to provide almost any desired sequence to the separate parts of the bed. The sequence can be chosen to induce a travelling wave within the bed which can be across or along the bed, and can be skewed relative to the sides of the bed. In a continuously operated bed, the travelling wave can move either co-currently with, counter-currently to, or cross-currently to, the direction of flow of the solids through the bed. This form of operation, particularly with a skewved travelling wave improves bed operating efficiency. Since the rotary valve cannot be closed completely, problems associated with abrasive dust in the gas feed, of valve lubrication, and valve differential thermal expansion are all substantially avoided.
(FR) Cette invention concerne un appareil et un procédé permettant de traiter des matériaux dans un lit fluidisé (10) à traitement par lots ou en continu, tel qu'un séchoir. Ce lit fluidisé se divise en plusieurs zones de taille réduite (20) vers chacune desquelles on envoie deux flux de gaz régulés séparément. Un premier flux de gaz inférieur est envoyé de préférence en continu vers le lit, ceci dans une quantité suffisante pour au moins maintenir le lit à l'état d'expansion. Un second flux de gaz supérieur est envoyé vers chacune des zones distinctes du lit, ceci de manière séquentielle et grâce à un système de clapet rotatif (21A, 22A, 23A, 24A). Ce second flux est suffisamment élevé pour induire la fluidisation du lit, mais pas assez cependant pour entraîner de grandes pertes en solides par entraînement dans les gaz de décharge. La séquence de flux supérieur peut être choisie de manière à obtenir quasiment n'importe quelle séquence voulue vers les parties distinctes du lit. La séquence peut être choisie afin de créer une onde progressive dans le lit, laquelle onde peut être transversale ou longitudinale par rapport au lit, et être rendue asymétrique par rapport aux bords de celui-ci. Dans un lit à fonctionnement continu, l'onde progressive peut se déplacer dans le sens du courant, à contre-courant ou en travers du courant par rapport à la direction d'écoulement des solides traversant le lit. Ce mode de fonctionnement, notamment dans le cas d'un onde progressive asymétrique, permet d'améliorer l'efficacité de fonctionnement du lit. Etant donné que le clapet rotatif ne peut être complètement fermé, il est ainsi possible d'éliminer quasiment tous les problèmes associés à la présence de poussière abrasive dans l'alimentation en gaz, à la lubrification du clapet, ainsi qu'à la dilatation thermique différentielle de ce dernier.
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Designated States: AU, CN, IL, JP, MX, NO, NZ, PL, RU
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0979140US5918569DE000069813207GB2324744AU1998070241