WO1991019146A1 - Ensemble de secheur de polymeres et de decharge de gaz - Google Patents

Ensemble de secheur de polymeres et de decharge de gaz Download PDF

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Publication number
WO1991019146A1
WO1991019146A1 PCT/US1991/003542 US9103542W WO9119146A1 WO 1991019146 A1 WO1991019146 A1 WO 1991019146A1 US 9103542 W US9103542 W US 9103542W WO 9119146 A1 WO9119146 A1 WO 9119146A1
Authority
WO
WIPO (PCT)
Prior art keywords
drier
vessel
gas
particulate matter
upper section
Prior art date
Application number
PCT/US1991/003542
Other languages
English (en)
Inventor
Granville Hahn
Allen Craig Bailey
Sammy Kent Flud
Original Assignee
Permian Research Corp.
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 Permian Research Corp. filed Critical Permian Research Corp.
Publication of WO1991019146A1 publication Critical patent/WO1991019146A1/fr

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Classifications

    • 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
    • F26B17/14—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 materials moving through a counter-current of gas
    • F26B17/1433—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 materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material

Definitions

  • This invention relates to an apparatus for drying particulate matter, and more particularly to an apparatus for use in drying polymeric pellets, granules or flakes.
  • U.S. Patent No. 4,584,366 the inventors disclose an apparatus comprising a single vessel with two stacked sections.
  • the upper section contains an agitator preferably comprising a rotary shaft having flat stirring bars appended thereto.
  • the lower section into which the polymer flows under gravitational force from the upper section, is merely a cylindrical vessel through which the polymer flows without separation or interruption. Hot, inert gas is injected into the lower portion of each section, and flows upwardly through the polymer bed to a collection system where it is filtered, dried, reheated and recirculated to the vessel.
  • the apparatus disclosed in U.S. 4,584,366 requires an excessive residence time to achieve adequate drying.
  • a drier for particulate matter comprises a circular array of gas discharge outlets communicating with a discharge plenum that is adapted to direct the outwardly flowing gas into the main discharge line for subsequent processing and/or reuse.
  • a plurality of gas discharge outlets are disposed in a circular array concentric with but spaced radially outward from a centrally disposed shaft extending downwardly into the drier vessel.
  • a circular plenum disposed above the gas discharge outlets collects the discharged gas and redirects the gas through headers to the main gas discharge line.
  • a drier for particulate matter comprises a centrally disposed rotatable shaft having a plurality of axially spaced stirring arms extending radially outward therefrom, and a centrally disposed, corrugated, frustoconical separator further comprising a plurality of apertures through which the downwardly flowing particulate matter and the upwardly flowing dry gas both pass, thereby promoting contact between them and better drying.
  • Figure 1 is a partially broken away, sectional elevation view of the drying apparatus of the invention
  • Figure 2 is a sectional plan view taken along line 2—2 of Figure 1;
  • drier 10 preferably comprises substantially cylindrical vessel 12 having centrally disposed, rotatable shaft 14 extending vertically downward from top 42 through substantially the entire interior portion of vessel 12.
  • a plurality of axially spaced, radially extending stirring arms are preferably attached to rotatable shaft 14 to assist in promoting the flow of particulate matter downward through vessel 12 from inlet 18 to outlet 20.
  • Gas inlet line 22 is preferably adapted to supply a relatively dry gas to circumferentially extending plenum 20 within the lower section of vessel 12. The relatively dry inlet air exits the plenum 30 through the plurality of apertures 52 disposed in inclined side wall 34 and plenum 35 of vessel 12.
  • apertures 52 cover substantially the entire surface of incline side wall 34 and plenum wall 35.
  • the diameter of apertures 52 is desirably less than the size of the particulate matter to be dried inside vessel 12 to prevent particulate matter from falling through apertures 52 into plenum 30.
  • the hot gas preferably air or a relatively inexpensive inert gas such as nitrogen, rises through the particulate matter inside drier 10, heating and drying the particulate matter while picking up moisture, fines and, in some cases, reaction products.
  • the apparatus of the invention is particularly desirable for use in drying polymer pellets, granules or flakes, but can also be used for drying other particulate solid material or mixtures including, for example, grain and grain products, sand, fertilizer, other granular chemical compounds, and the like.
  • Particulate matter is desirably introduced into drier 10 through inlet 18 in such quantities that the uppermost level of particulate matter within drier 12 does not exceed the height of the uppermost stirring arm 16.
  • the downward flow of particulate matter is impeded by corrugated frustoconical separator 32 that extends across the interior of vessel 12 from inclined sidewall 34 to shaft 14.
  • the base of corrugated frustoconical separator 32 preferably rests against inclined sidewall 34, and the top of separator 32 is preferably a collar that is closely adjacent to, but not contacting, shaft 14.
  • Deflector shield 40 attached to shaft 14 is provided above the uppermost portion of corrugated frustoconical separator 32 to prevent the downwardly flowing particulate material from clogging the annular space between the top of frustoconical separator 32 and shaft 14. Deflector 40 also serves to deflect gas rising through the same annular space above frustoconical separator 32.
  • the corrugated panels of frustoconical separator 32 each preferably comprise a plurality of apertures 38 having a diameter slightly larger than the particle size of the downwardly flowing particulate matter. According to this preferred configuration, essentially all particulate matter flowing downwardly through vessel 12 must at sometime pass through apertures 38 in corrugated frustoconical separator 32.
  • frustoconical separator 32 in cooperation with rotating shaft 14, stirring arm 16 and the dry, heated gas rising upwardly from plenum 30, reduces clumping, agglomeration or channeling that might otherwise occur in the downwardly flowing particulate matter.
  • a plurality of circumferentially and radially spaced gas discharge outlets 26 are provided around shaft 14 and top 42 of vessel 12 to receive and collect gas that rises through the particulate matter flowing downwardly through drier 10.
  • gas discharge outlets 26 are preferably disposed in a circular array that is concentric with shaft 14 and spaced radially outward from shaft 14 approximately one half the distance between shaft 14 and the sidewall of the upper portion of vessel 12.
  • Gas discharged through outlets 26 passes into a circular plenum defined by sidewalls 44, 46, which in turn direct the spent gas through headers 48, 50 into gas discharge line 24.
  • a plurality of gas discharge outlets 26 spaced apart across top 42 of vessel 12 it is believed that channeling of the heated gas rising upwardly through the downwardly flowing particulate matter can be minimized to a greater extent than has previously been possible. Because all gas exiting vessel 12 is not required to pass through a single outlet in top 42, a different pressure distribution is believed to be established across the interior of the upper portion of vessel 12, thereby providing a more even distribution of outwardly flowing gas and more efficient drying of the particulate matter.
  • drier 10 as disclosed herein is suitable for use in a drier system comprising means for introducing particulate matter and heated gas into the drier, means for recovering gas from the drier and for filtering, condensing, drying, reheating and recirculating the gas to the drier, means for recovering dry particulate matter discharged from the drier, and means for restricting the flow of recirculating gas through the drier following a cessation of particulate matter flow through the drier as described in more detail in U.S 4,839,969, the disclosure of which is incorporated by reference herein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Sécheur (10) adapté pour permettre un contact à contre-courant entre une matière particulaire et un gaz relativement plus sec, le sécheur (10) comprenant une pluralité d'orifices de sortie (26) de décharge de gaz espacés de manière circonférentielle ainsi qu'un séparateur tronconique ondulé (32) disposé centralement, comprenant une pluralité d'orifices (38) à travers lesquels la matière particulaire et le gaz doivent passer tandis qu'ils s'écoulent dans des sens opposés dans le sécheur (10).
PCT/US1991/003542 1990-05-25 1991-05-24 Ensemble de secheur de polymeres et de decharge de gaz WO1991019146A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52996690A 1990-05-25 1990-05-25
US529,966 1990-05-25

Publications (1)

Publication Number Publication Date
WO1991019146A1 true WO1991019146A1 (fr) 1991-12-12

Family

ID=24111921

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/003542 WO1991019146A1 (fr) 1990-05-25 1991-05-24 Ensemble de secheur de polymeres et de decharge de gaz

Country Status (2)

Country Link
AU (1) AU8071091A (fr)
WO (1) WO1991019146A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113321262A (zh) * 2021-07-01 2021-08-31 江西台标环保有限公司 一种适用于纺织印染废水处理的混凝气浮方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2049199A (en) * 1933-11-28 1936-07-28 John F Dornfeld Drying apparatus
US4839969A (en) * 1988-02-26 1989-06-20 Permian Research Corporation Drying method and apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2049199A (en) * 1933-11-28 1936-07-28 John F Dornfeld Drying apparatus
US4839969A (en) * 1988-02-26 1989-06-20 Permian Research Corporation Drying method and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113321262A (zh) * 2021-07-01 2021-08-31 江西台标环保有限公司 一种适用于纺织印染废水处理的混凝气浮方法

Also Published As

Publication number Publication date
AU8071091A (en) 1991-12-31

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