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US3805403A - Adjusting arrangement for a fluidised bed device - Google Patents

Adjusting arrangement for a fluidised bed device Download PDF

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Publication number
US3805403A
US3805403A US00275054A US27505472A US3805403A US 3805403 A US3805403 A US 3805403A US 00275054 A US00275054 A US 00275054A US 27505472 A US27505472 A US 27505472A US 3805403 A US3805403 A US 3805403A
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US
United States
Prior art keywords
chute
stream
channel
air
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00275054A
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English (en)
Inventor
J Biaggi
J Oertle
M Leonhardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer Escher Wyss AG
Original Assignee
Escher Wyss AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Escher Wyss AG filed Critical Escher Wyss AG
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Publication of US3805403A publication Critical patent/US3805403A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1809—Controlling processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/36—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed through which there is an essentially horizontal flow of particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/16—Gas pressure systems operating with fluidisation of the materials
    • B65G53/18—Gas pressure systems operating with fluidisation of the materials through a porous wall
    • B65G53/22—Gas pressure systems operating with fluidisation of the materials through a porous wall the systems comprising a reservoir, e.g. a bunker
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat 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
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat 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 the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat 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 the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F26B3/092—Drying solid materials or objects by processes involving the application of heat 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 the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed agitating the fluidised bed, e.g. by vibrating or pulsating
    • F26B3/0923—Drying solid materials or objects by processes involving the application of heat 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 the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed agitating the fluidised bed, e.g. by vibrating or pulsating by mechanical means, e.g. vibrated plate, stirrer

Definitions

  • ABSTRACT In a fluidised bed device having a perforated channel for a stream of material travelling through said channel, and a chute for the outflow of said stream out of said channel, the arrangement that the bottom of said chute follows said channel in prolongation of the bottom of said channel, said chute forming a free outlet for said stream, and that a regulating means is provided capable of varying the friction between said stream and said bottom of said chute.
  • the invention relates to regulating the height of a fluidised bed of a stream of material travelling through a perforated channel of a fluidised bed device which comprises a chute for the outflow of the stream of material.
  • a stream of powder, granular or crystalised solids is conveyed in the form ofa fluidised bed.
  • a stream of such material particles is sent through a channel the bottom of which consists of a perforated plate below which is arranged a box into which air or gas can be admitted.
  • the air entering the channel from this box forms with the material particles a fluidised bed travelling over the bottom of the channel.
  • This method is particularly advantageous for various processes dealing with these particles, for example when treating them in a so-called fluidised bed drier.
  • the invention has as its object an arrangement by means of which the desired height for the fluidised bed of a fluidised bed device can be regulated automatically, that is to say without blockages having to be eliminated from time to time.
  • the bottom of the chute has perforations and comprises underneath it an air supply box for passing a variable flow of air through the perforations of said bottom.
  • the air supply box capable of being supplied with air at variable pressure.
  • the size of the perforations in the bottom of the chute can be made variable.
  • a shield can be provided which is slidable along the bottom of the chute.
  • the friction between the stream of material and the bottom of the chute can advantageously be varied also by sub-dividing the bottom of the chute into at least two portions, in the direction of movement of said stream, the portion which is downstream in the direction of movement of said stream being telescopically 2 displaceable relatively to the preceding portion, so that the length of the chute can be varied.
  • the friction which occurs between the stream of material and the bottom of the chute can advantageously be made variable by making the inclination of the bottom of the chute variable.
  • This is particularly advantageous in the case of a non-perforated chute bottom, i.e. in a construction without an air supply box.
  • the entire chute can be inclined, for which purpose there is provided between the bottom of the channel and the bottom of the chute a hinge, or a portion of the chute bottom can be secured by means of a hinge on the portion of the chute bottom which precedes it in the direction of movement of the stream of material.
  • FIG. 1 shows a side view partly in section of a fluidised bed drier provided with the arrangement according to the invention
  • FIG. 2 shows a view of a fragment of FIG. 1 on a larger scale
  • FIGS. 3 to 5 show vertical sections corresponding to FIG. 2 through further embodiments
  • FIG. 6 shows the subject of FIG. 5 with the fluidised bed height adjusted to a different value.
  • the fluidised bed drier shown in FIGS. 1 and 2 comprises a drying chamber 1 through which the stream of material to be dried passes over its entire length.
  • the drying chamber 1 At the left-hand end in the drawing the drying chamber 1 is provided with an inlet 2 for the material to be treated, that is to say dried, whereas at its other end, at the right in the drawing, it comprises an outlet 3 for the dried material.
  • the lower part of the drying chamber 1 forms a channel for conveying the stream of material being dried in the form of a fluidised bed.
  • the bottom 4 of the drying chamber] consists of a horizontal plate provided with a plurality of fine perforations.
  • a box 5 Provided under the bottom 4 is a box 5 through which compressed air or gas under pressure is supplied to the perforations of the bottom 4.
  • the end 6 of the box 5 situated below the inlet 2 is connected to a conduit 7 for gas or air under pressure.
  • the gas or air entering the chamber 1 through the perforations in the bottom 4 forms with the particles of material to be dried a fluidised bed which moves over channel of the fluidised bed drier is followed by the bottom 9 of a chute, which bottom 9 is in prolongation of the bottom 4 of the channel.
  • the chute forms a free outflow for the stream of material issuing from the outlet 3, a regulating means being provided capable of varying the friction between the stream of material and the bottom 9 of the chute.
  • the bottom 9 of the chute is constructed as a perforated plate. Situated below the bottom 9 is an air supply box 8. The flow of air passing out of the air supply box 8 through the perforations of the bottom 9 can be modified.
  • the air supply box 8 can be supplied with air at variable pressure.
  • Two air inlets l and 11 are provided which open into the box 8.
  • the air inlet 10 is connected to the main fan (not shown) of the fluidised bed drier and provided with a throttle valve 12 for regulating the throughflow of air.
  • the air inlet 11 is connected to the box 5 of the fluidised bed drier and provided with a throttle valve 13.
  • the material P being dried forms on the bottom 9 of the chute a natural slope which corresponds to the oscillatory conditions of the oscillatory unit 1,5. This slope corresponds to a certain height H of fluidised bed. But if a certain quantity of air is blown through the perforations of the bottom 9, the friction between the material flow P and the bottom 9 of the chute is reduced. Owing to the material flow sliding off more quickly and being aerated, the angle of the slope and with it the height H of the fluidised bed is reduced.
  • the height H of the fluidised bed can be kept to a predetermined desired value.
  • the bottom 9 of the chute follows tangentially the bottom 4 of the channel and is increasingly inclined in the direction of movement of the stream of material
  • the embodiment shown in FIG. 3 there is a slight inflection or break between the bottom 9 of the chute and the bottom 4 of the channel.
  • the bottom 9 of the chute is inclined in the direction of movement of said stream at least locally relatively to the horizontal.
  • the following measure is adopted.
  • the bottom of the chute is sub-divided in the direction of movement of said stream into two portions 9 and 9 the portion 9 which is downstream in the direction of movement of said stream being capable of being displaced telescopically relatively to the preceding portion 9, so that the length of the chute 9 can be varied.
  • the portion 9 is connected securely to the box 5, whereas the portion 9 can be displaced from the illustrated position into the position indicated by dot-dash lines.
  • the height of the fluidised bed can be regulated to the desired value.
  • FIGS. 5 and 6 corresponds substantially to the embodiment according to FIGS. 1 and 2.
  • a shield 14 which can be displaced along the bottom 9.
  • the shield 14 is arranged in the direction of movement of the stream of material at the end of the bottom 9, whereby a low height h is obtained for the fluidised bed.
  • the shield abuts on the beginning of the bottom 9, resulting in a greater height H for the fluidised bed.
  • the shield 14 in the embodiment shown in FIGS. 5 and 6 is situated above the bottom 9. But it could also be arranged below the bottom 9, i.e. in the box 8.
  • the size of the perforations in the bottom 9 could also be made variable, for example by means of a shield corresponding to the shield 14 and provided with the same perforations as the bottom 9, said shield being displaceable along the bottom 9 by an amount corresponding to half the pitch of the perforations.
  • the chutes do not have any side walls.
  • the chutes can be provided with side walls which, if desired, can have perforations connected to an air source.
  • the illustrated regulating means for varying the friction between the material stream and the bottom of the chute can be controlled by a sensor arranged above the fluidised bed and adjusted to the desired height of the fluidised bed.
  • a fluidised bed device having a perforated channel for a stream of material travelling through said channel, and a chute for the outflow of said stream, said chute following said channel in the direction of said stream, an arrangement for regulating the height of said stream which is characterized in that the bottom of said chute follows said channel in prolongation of the bottom of said channel, said chute forming a free outlet for said stream, and that a regulating means is provided capable of varying the friction between said stream and said bottom of said chute.
  • Device in which a shield is provided being displaceable along said bottom of said chute, for varying said flow of gas or air.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Microbiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Chutes (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Jigging Conveyors (AREA)
US00275054A 1971-07-26 1972-07-25 Adjusting arrangement for a fluidised bed device Expired - Lifetime US3805403A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7127258A FR2147386A5 (xx) 1971-07-26 1971-07-26

Publications (1)

Publication Number Publication Date
US3805403A true US3805403A (en) 1974-04-23

Family

ID=9080898

Family Applications (1)

Application Number Title Priority Date Filing Date
US00275054A Expired - Lifetime US3805403A (en) 1971-07-26 1972-07-25 Adjusting arrangement for a fluidised bed device

Country Status (8)

Country Link
US (1) US3805403A (xx)
JP (1) JPS5522140B1 (xx)
CA (1) CA966443A (xx)
CH (1) CH547475A (xx)
DE (2) DE2236613B2 (xx)
FR (1) FR2147386A5 (xx)
GB (1) GB1392959A (xx)
NL (1) NL7210255A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480522A (en) * 1981-10-15 1984-11-06 General Dynamics, Pomona Division Rocket exhaust-gas deflector

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325967C2 (de) * 1983-07-19 1985-10-24 NEOTEC Gesellschaft für Nahrungsmittelverfahrenstechnik mbH & Co KG, 2000 Norderstedt Fördernde Wirbelschicht-Vorrichtung
AT10660U1 (de) * 2008-03-19 2009-07-15 Binder Co Ag Trockner mit kühlmedium
CN104764300B (zh) * 2014-01-06 2018-08-28 山东科院天力节能工程有限公司 热动力流态化蒸发分离装置及工艺
CN104764299B (zh) * 2014-01-06 2018-08-28 山东科院天力节能工程有限公司 带外部加压的热动力流态化蒸发分离装置及工艺

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513369A (en) * 1946-07-02 1950-07-04 Terminal Island Sea Foods Ltd Drying by fluidization of the work
CA545532A (en) * 1957-08-27 J. Sylvest Karl Fluidized feeder for pulverulent material
US3188144A (en) * 1961-04-12 1965-06-08 Buehler Ag Geb Bin discharge means
GB1058084A (en) * 1962-10-16 1967-02-08 Coal Industry Patents Ltd Improvements in thermal drying and dry separating of particulate solid material
US3304619A (en) * 1965-01-27 1967-02-21 Rudolph E Futer Method and means for changing the temperature of granular material by gas jets
US3543414A (en) * 1968-02-13 1970-12-01 Tunzini Ameliorair Sa Gas treatment apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA545532A (en) * 1957-08-27 J. Sylvest Karl Fluidized feeder for pulverulent material
US2513369A (en) * 1946-07-02 1950-07-04 Terminal Island Sea Foods Ltd Drying by fluidization of the work
US3188144A (en) * 1961-04-12 1965-06-08 Buehler Ag Geb Bin discharge means
GB1058084A (en) * 1962-10-16 1967-02-08 Coal Industry Patents Ltd Improvements in thermal drying and dry separating of particulate solid material
US3304619A (en) * 1965-01-27 1967-02-21 Rudolph E Futer Method and means for changing the temperature of granular material by gas jets
US3543414A (en) * 1968-02-13 1970-12-01 Tunzini Ameliorair Sa Gas treatment apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480522A (en) * 1981-10-15 1984-11-06 General Dynamics, Pomona Division Rocket exhaust-gas deflector

Also Published As

Publication number Publication date
DE2236613A1 (de) 1973-02-22
GB1392959A (en) 1975-05-07
JPS5522140B1 (xx) 1980-06-14
DE7227641U (de) 1977-04-28
CA966443A (en) 1975-04-22
CH547475A (de) 1974-03-29
DE2236613B2 (de) 1975-08-21
FR2147386A5 (xx) 1973-03-09
NL7210255A (xx) 1973-01-30

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