US3803726A - Convection drier with a travelling bed - Google Patents

Convection drier with a travelling bed Download PDF

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Publication number
US3803726A
US3803726A US00336761A US33676173A US3803726A US 3803726 A US3803726 A US 3803726A US 00336761 A US00336761 A US 00336761A US 33676173 A US33676173 A US 33676173A US 3803726 A US3803726 A US 3803726A
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United States
Prior art keywords
drier
materials
drying
conveyor
dried
Prior art date
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Expired - Lifetime
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US00336761A
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English (en)
Inventor
J Pikon
P Wasilewski
B Mitka
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Individual
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Individual
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Filing date
Publication date
Priority claimed from PL15387872A external-priority patent/PL72532B1/xx
Priority claimed from PL15486572A external-priority patent/PL82952B3/xx
Priority claimed from PL15568372A external-priority patent/PL82030B3/xx
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3803726A publication Critical patent/US3803726A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/20—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all vertical or steeply inclined
    • F26B15/22—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all vertical or steeply inclined the objects or batches of materials being carried by endless belts the objects or batches of material being carried by trays or holders supported by endless belts or chains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/122—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the material moving through a cross-flow of drying gas; the drying enclosure, e.g. shaft, consisting of substantially vertical, perforated walls

Definitions

  • a stream of a drying agent/hot air or combustion gases/ is passed through a bed of dried material blowing upon the particular particles of this material and removing moisture therefrom. Owing to the fact that the drying agent is passed in variable directions, a good turbulence of air flow as well as a high heat exchange can be obtained.
  • the dried bed is passed be-v tween two perforated walls by means of a chain conveyor or falls sliding down by itself due to the force of gravity.
  • the overall dimensions of the drier of the invention are far smaller than those ones of conventional driers.
  • the drier can be adapted to drying bulk materials in large quantities and requires only small power supplies.
  • the gas/even polluted combustiongases/ used in the drying process is preliminary cleaned in the drier for further use.
  • the drying agent flows above the surface of dried material as exemplary in the drum or tray driers or the drying agent entrains the particles of dried material as in the pneumatic or fluidized solids driers.
  • the drier with two parallel perforated confined walls'and with a conveyor disposed between said walls and having shelves suspended on chains, and the said conveyor is guided so as to form a chamber in'the middle of the drier wherein the drying agent is supplied.
  • a conveyor disposed between said walls and having shelves suspended on chains, and the said conveyor is guided so as to form a chamber in'the middle of the drier wherein the drying agent is supplied.
  • stub pipes serving for loading and unloading dried material.
  • the travelling rate of dried material is dependent upon the drying time and may be optionally adjusted by changing the number of revolutions of the drive wheel according to the desired humidity of the final material.
  • the drier according to the invention has a simple construction which enables to carry out the drying process continuously.
  • the heat utilization and the drying rate are far higher than in the driers where the drying agent is passed above the surface of material provided for drying.
  • Application of perforated walls in form of wire gauzes or perforated plates unables the particles of dried material to be carried away with the drying agent, thus providing facili ties for convection drying without necessity to use dust collectors.
  • the drier may be air heated or with polluted exhaust gases, owing to location of the chamber in the central part of the drier where exhaust gases can be partially dedusted and the residual dust settles on the layer of the dried material. The exhaust gases leaving the drier are dedusted and their heat is utilized in far higher degree than in the known driers.
  • the drier of the invention enables'waste heat of polluted exhaust gases to be utilized and thus the drier is not only adapted to drying but also to dedusting exhaust gases on the layer of the dried bed.
  • the drier of the invention can be applied in a wide scope particularly for drying bulk materials such as coal, fine coal, coke, brown coal, sand, corn and ethers. As indicated above it can be also used for utilizing waste heat of exhaust gases from steam boilers etc. In order to enable sizing and oiling operations the drier may be provided with means for additional size distribution of dried material and oiling and ramming means preventing from forming channels in the dried material.
  • the outlet stub pipes are connected with cascade sieves, which are provided with outlet means for withdrawing coarse and fine grained material.
  • the oil sprayers are placed under sieves and near feed stub pipes on horizontal segments of the chamber are ramming means in form of pistons or rollers.
  • the condensers for condensing gases and recovering the condensate can be also connected to outlet stub'pipes in order to withdraw the drying agent.
  • the drier can be also blown through as well on vertical as on horizontal segments. Owing to possibility of fractionating and oiling the material ,in the drier, the drier of the invention can be especially adapted to coking processes for low-grade, slow-coking coals, for manu-.
  • the ramming means in form of pistons or rollers prevent from forming channels in the dried material and provide for shortening the drying period.
  • the conveyor or conveyors with shelves form a triangle with the vertex headed downwards and are placed in a confined chamher or chambers.
  • feed stub pipes and outlet stub pipes in the bottom part.
  • the conveyors may be provided with a common drive.
  • the drier In thec'ase when the material is loose and easy flowing the drier has no conveyors but only :outlet stub pipes provided with batchers. Thus the construction of the drier is considerably simplified. This technical solution makes possible to feed the material from above and withdraw it in the bottom part of the drier, so the drier can be much easier loaded and unloaded.
  • the downward motion of the dried material enables good filling of the drierwithout necessity to use additional ramming means such as pistons or rollers and provides the uniform air distribution on the wholesurface'of thedrying wall.
  • additional ramming means such as pistons or rollers and provides the uniform air distribution on the wholesurface'of thedrying wall.
  • Application of two separate conveyors and two chambers enables two various materials to be driedand in the event of failure the drier can be cut off by half. It will be also noted that when materials are easyfalling down between two perforated walls the conveyors and the power transmission system can be eliminated.
  • the drier may be also used for heating the cokingcharge.
  • FIG. 1 presents the vertical section
  • FIG. 2 a variant of the drier furnished with sieves for fractionating materials, condensers for steam condensation and ramming means and FIG. 3 presents a variant of the drier wherein the material is falling downwards.
  • the chain drive system may be eliminated and the drier equipped only with batchers in its bottom part.
  • the bed 1 comprising a dried material is conveyed between two perforated walls 2 and 3 by means of chain conveyor 4 equipped with shelves 5.
  • the whole system is driven through a sprocket wheel 6 by an electric motor provided with a reduction gear.
  • the drier is continuously filled with materials on the horizontal segments by stub pipes 7 and also on the horizontal segments the dried materials are unloaded'by stub pipes 8.
  • a drying agent in form of hot air or exhaust gases is continuously fed on vertical segments of the drier throughout the bed of dried material I.
  • Thebed 1 after being introduced into a drier by stub pipes 7 is conveyed by means of shelves of conveyor 4.
  • the hot drying agen flows through the layer of the bed 1 and causes its drying.
  • the dried bed is withdrawn by stub pipes 8.
  • the rate of travelling of the dried material depends upon the rate of drying and is adjusted by changing number of revolutions of drive wheels 6.
  • Hot air or exhaust gases are fed to the chamber 10 by stub pipe 9. If exhaust gases are polluted they will be partially dedusted in the chamber 10 as the dust particles fall on the bottom of the drier whcrefrom they are collected by the conveyor 4 which is open from inside of the chamber.
  • the exhaust gases are further purified on the layer of the dried bed 1.
  • the cold and moist air leaves the drier by stub pipe 11.
  • the bed 1 of dried material is rammed by pistons 21.
  • Stub pipes 8 are provided with cascade sieves 12 which enable the material to be distributed into different fractions.
  • the drying agent leaves the drier by the steam outlet pipes 11 to which the condensers 16 for steam condensation and recovering of condensate can be adjoined.
  • the condensate is withdrawn from the condenser 16 by stub pipe 18. Uncondensed gases escape to atmosphere by stub pipes 17.
  • the cooling agent in form of air or water is fed by stub pipes 19 and withdrawn by stub pipes 20.
  • the bed 1 is conveyed by means of two conveyors 4 provided with shelves 5.
  • the whole system is driven by toothed wheels 6 which are connected through a reduction gear with an electric motor.
  • These two conveyors may be driven by a common drive or by" separate drives.
  • the drier is continuously filled in the upper part by stub pipes 7 and'unloaded in its bottom part by stub pipes 8.
  • the drying agent comprising hot air, exhaust gases or superheated steam is fed by stub pipe 9 and passed through thebed of dried material on the vertical segments of the drier.
  • the bed 1 comprising material provided for drying is introduced to the drier by stub pipes 7 and conveyed downhill by means of shelves 5 of the conveyor 4.
  • the hot drying agent flows throughout the layer of material provided for drying and causes its drying.
  • the dried bed 1 is withdrawn by stub pipes 8.
  • the travelling rate of the dried bed depends upon the drying rate and is adjusted by changing number of revolutions of drive wheels 6.
  • the conveyor 4 may be eliminated with regard to flow of the material under force of gravitation and only stub pipes should be provided with batchers 23.
  • Hot air or exhaust gases are fed by stub pipes 9 to two chambers 10 formed by a partition wall 22. Exhaust gases are preliminary de-dusted in chambers 10 wherein dust particles fall down on the bottom. Further scavenging of exhaust gases occurs on the layer of the dried bed 1. After passing through the bed 1 cold and moist air escapes to atmosphere or it is withdrawn by stub pipes which is not shown in the drawing.
  • a convection dryer'with a travelling bed comprising; a pair of parallel spaced perforated walls; a movable conveyor extending between said walls in generally vertically and horizontally paths of movement; said conveyor including shelves and chain meansinterconnecting said shelves so as to define an enclosed chamber encompassed by said conveyor and said walls; inlet means for supplying wet materials to horizontal portions of said conveyor; outlet means for removing dried materials from horizontal portions of said conveyor; inlet means for supplying a gaseous drying medium into said enclosed chamber; and outlet means for withdrawing said drying medium, said inlet and outlet means for said gaseous drying medium being positioned so as to effect flow of said drying medium through said materi als in at least the vertical portions of said movable conveyor.
  • a dryer comprising cascade sieve means being positioned in the outlet means for said dried materials, said cascade sieve means including outlets for withdrawing respectively fine and coarse fractions of said materials; oil spray means connected to at least one of said last-mentioned outlets; and ramming means positioned at the horizontal portions of said conveyor proximate said inlet means for said wet materials and being adapted to compact said materials.
  • a dryer according to claim 1 comprising a pair of said conveyors each having triangular paths of movement'including a vertical and an upper horizontal portion; inlet means for said wet materials communicating with the upper horizontal portions of each of said conveyors; and outlet means for said dried materials being located proximate the lower ends of said conveyors.
  • a dryer according to claim 3 comprising common drive means for jointly driving said conveyors 5.
  • a dryer according to claim 3, comprising independent drive means for each of said conveyors.
  • a dryer according to claim 1 comprising batchers positioned in said outlet means for said dried materials for drying loose and freely flowing materials.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
US00336761A 1972-03-06 1973-02-28 Convection drier with a travelling bed Expired - Lifetime US3803726A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PL15387872A PL72532B1 (xx) 1972-03-06 1972-03-06
PL15486572A PL82952B3 (xx) 1972-04-20 1972-04-20
PL15568372A PL82030B3 (xx) 1972-05-30 1972-05-30

Publications (1)

Publication Number Publication Date
US3803726A true US3803726A (en) 1974-04-16

Family

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Application Number Title Priority Date Filing Date
US00336761A Expired - Lifetime US3803726A (en) 1972-03-06 1973-02-28 Convection drier with a travelling bed

Country Status (9)

Country Link
US (1) US3803726A (xx)
JP (1) JPS5249571B2 (xx)
CS (1) CS186771B2 (xx)
DD (1) DD103501A5 (xx)
ES (1) ES412236A1 (xx)
FR (1) FR2175423A5 (xx)
GB (1) GB1416826A (xx)
RO (1) RO62073A (xx)
SU (1) SU520941A3 (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090019721A1 (en) * 2007-07-17 2009-01-22 W. S. Tyler Method and apparatus for drying particles of bulk material
WO2009018996A2 (en) * 2007-08-07 2009-02-12 Mars Incorporated Method and apparatus for drying a material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112629234B (zh) * 2020-11-04 2022-10-21 南理工泰兴智能制造研究院有限公司 一种造气炉渣水分离装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE501063A (xx) *
US1880284A (en) * 1928-10-30 1932-10-04 F W Buse Conveyer
DE806111C (de) * 1948-10-02 1951-06-11 Alfred Luetge Trockner fuer feuchtes Gut

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE501063A (xx) *
US1880284A (en) * 1928-10-30 1932-10-04 F W Buse Conveyer
DE806111C (de) * 1948-10-02 1951-06-11 Alfred Luetge Trockner fuer feuchtes Gut

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090019721A1 (en) * 2007-07-17 2009-01-22 W. S. Tyler Method and apparatus for drying particles of bulk material
WO2009018996A2 (en) * 2007-08-07 2009-02-12 Mars Incorporated Method and apparatus for drying a material
WO2009018996A3 (en) * 2007-08-07 2009-04-30 Mars Inc Method and apparatus for drying a material
US20110030237A1 (en) * 2007-08-07 2011-02-10 Mars,Inc. Method and apparatus for drying a material
AU2008285928B2 (en) * 2007-08-07 2012-10-11 Mars, Incorporated Method and apparatus for drying a material
AU2008285928B8 (en) * 2007-08-07 2012-11-01 Mars, Incorporated Method and apparatus for drying a material
AU2008285928A8 (en) * 2007-08-07 2012-11-01 Mars, Incorporated Method and apparatus for drying a material
US10006714B2 (en) 2007-08-07 2018-06-26 Mars, Incorporated Apparatus for drying a material
US10113794B2 (en) 2007-08-07 2018-10-30 Mars, Incorporated Method for drying a material

Also Published As

Publication number Publication date
FR2175423A5 (xx) 1973-10-19
RO62073A (xx) 1977-08-15
ES412236A1 (es) 1976-01-01
JPS48104146A (xx) 1973-12-27
SU520941A3 (ru) 1976-07-05
DE2309759A1 (de) 1973-09-20
JPS5249571B2 (xx) 1977-12-17
DD103501A5 (xx) 1974-01-20
CS186771B2 (en) 1978-12-29
GB1416826A (en) 1975-12-10
DE2309759B2 (de) 1977-07-07

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