US3611585A - Apparatus for drying pulverant materials - Google Patents

Apparatus for drying pulverant materials Download PDF

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Publication number
US3611585A
US3611585A US832167A US3611585DA US3611585A US 3611585 A US3611585 A US 3611585A US 832167 A US832167 A US 832167A US 3611585D A US3611585D A US 3611585DA US 3611585 A US3611585 A US 3611585A
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United States
Prior art keywords
drying
chamber
drying chamber
pulverant
gas
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Expired - Lifetime
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US832167A
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English (en)
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Jiyuichi Nara
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Individual
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
    • B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/16—Auxiliary treatment of granules

Definitions

  • This invention relates to a continuous-flow type drying apparatus for pulverant materials which has a plurality of drying chambers arranged vertically in multiple stages.
  • the present invention has for its object the provision of a drying apparatus for drying organic materials such as synthetic resins and inorganic chemicals wetted or moistened with various organic solvents and water either singly or in mixture, which is able to suspend and fiuidize a large quantity of pulverant material with a relatively limited amount of hot gas, extend the residence time of the particles to a much greater period than in the conventional apparatus using the same amount of hot gas, avoid any wasteful heat exchanging action among the particles, the hot gas for fluidizing the pulverant material, and the heat exchangers, and which can be made relatively compact in construction despite the capability of operating with a high degree of thermal efficiency.
  • a drying apparatus for drying organic materials such as synthetic resins and inorganic chemicals wetted or moistened with various organic solvents and water either singly or in mixture
  • the invention concerns a multi-stage, continuousflow type apparatus for drying pulverant materials
  • a multi-stage, continuousflow type apparatus for drying pulverant materials comprising a plurality of drying chambers arranged vertically in multiple stages, the uppermost drying chamber having an air shut-off type inlet port for the supply of pulverant material on one side of the upper portion and an exhaust port for humidified air in the ceiling and also a perforated plate at the bottom and heat exchanger means disposed thereover, a weir plate located on the side of said first drying chamber opposite to the side where there is provided the inlet port for the supply of pulverant material, said weir plate defining a discharge port for the pulverant material which overflows and a discharge port for the underfiowing material, the drying chamber in the stage immediately below said first chamber utilizing the discharge ports of the first chamber as the ports for the supply of pulverant material and using the perforated plate for the first chamber as the ceiling and also being provided with another perforated plate at the bottom which carries
  • T971 cating chamber and a duct for the introduction of hot gas blast under the perforated plate and a cyclone collector in communication with the gas exhaust port of the uppermost drying chamber, said cyclone collector being provided with a powder discharge pipe which is open in a desired drying chamber and also with a gas exhaust pipe in communication with said hot gas communicating chamber of the lowermost drying chamber through known means for conditioning the hot gas such as for cooling, drying, heating and compressing said gas.
  • this invention provides an apparatus as shown, in which a plurality of drying chambers, generally indicated at I, II and III, are arranged vertically in multiple stages.
  • the uppermost drying chamber I has an air shout-off type inlet port 1 for the supply of pulverant material on one side of the upper portion and an exhaust port 2 for humidified air in the ceiling.
  • the chamber also has a perforated plate 3 at the bottom and heat exchanger means 4 disposed thereover. Said heat exchanger means are such conventional system as flow a heat medium through a pipe line.
  • a weir plate 5 is located on the side of the first drying chamber I opposite to 'the side where there is provided the inlet port 1 for the supply of pulverant material.
  • This weir plate defines a discharge port 6 for the pulverant material which overflows and a discharge port 7 for pulverant material which overflows and a discharge port 7 the underflowing material.
  • the drying chamber II in the stage immediately below said first chamber utilizes the discharge ports 6 and 7 of the overlying chamber I as the ports for the supply of pulverant material and uses the perforated plate 3 for the drying chamber I as the ceiling.
  • a perforated plate 3 which carries heat exchanger means 4 thereover.
  • the lower drying chamber II is provided with a weir plate 5 and two discharge ports 6 and 7 for pulverant material on the side opposite to the side where there are provided the two inlet ports 6 and 7.
  • the lowermost chamber III has a hot gas communicating chamber 8 and a duct 9 for the introduction of hot gas blast under the perforated plate 3".
  • the gas exhaust port 2 of the uppermost drying chamber I communicates to a cyclone collector 10, which is provided with a powder discharge pipe 11 which is open in a desired drying chamber and is also provided with a gas exhaust pipe 12 in communication with the hot gas communicating chamber 8 of the lowermost drying chamber through known means 13 said means 13 is one of conventional type for conditioning the hot gas such as for cooling, drying, heating and compressing the same for example Pebody scrubber.”
  • reference numeral 14 designates a conventional rotary valve provided on the line for the introduction of the pulverant material from the cylone collector 10 into the drying chamber 1, II or III
  • numeral 15 designates a change-over valve for selecting the drying chamber through which the pulverant material is to be recycled.
  • Said ports 1, 6, 7, 6', 7, 6", 7" are provided with a conventional air shut-oil valve respectively, for example rotary valve.
  • damp pulverant material is fed into the drying chamber I through the inlet port 1, While steam or hot water is circulated through the heat exchanger means 4, 4' and 4" and hot gas is forced into the hot gas communicating chamber 8 through the line 9.
  • the damp pulverant material is fluidized over the perforated plate 3, heated and dried by subjection to heat from the heat exchanger means 4, and is led through the spaces above and under the weir plate and thence through the discharge ports 6 and 7, into the underlying drying chamber II.
  • the pulverant material is fluidized over the perforated plate 3', heated and dried through contact with the heat exchanger means 4', and is discharged from above and below the weir plate 5 to the discharge ports 6' and 7
  • the pulverant material supplied from the discharge ports 6' and 7' into the another underlying drying chamber is subjected to a more intense heating and drying action than in the drying chamber II and is led to the ensuing drying chamber or chambers.
  • Discharge ports 7, 7' and 7" are necessary because coarse powders are mixed with the fine powders, and some particles fuse together, and these coarse powders do not readily flow over the tops of the weir plates. In the absence of the lower outlets at 7, 7 and 7, the larger particles would accumulate in the drying chamber.
  • the gas containing the pulverant material is sent to the cyclone collector 10.
  • the exhaust gas is delivered to the known means 13, be controlled humidity by cooling subsequently be heated and compressed, will be delivered to the hot gas communicating chamber 8 of the lowermost drying chamber III.
  • the pulverant material collected by the collector 10 is recycled through the rotary valve 14 and the change-over valve 15 into a desired drying chamber.
  • the polypropylene resin in powdery form is fed through a centrifugal dehumidifier to the drying process as moistened to 3O 45% W.B. (water base) with heptane.
  • the pulverant material in this state is readily dried by a gas at a relatively high temperature (with a dew point of 45 60 C.) to the primary equilibrium moisture content of 1.5-2.0% W.B.
  • the temperature of the material itself must be increased to about 120 C. while the material is in thorough contact with a 'gas at low temperature (with a dew point of 15 to C.).
  • the present invention is based on the finding that the drying after arrival at the primary equilibrium moisture content is accomplished chiefly by the contact of the pulverant material with a low humidity gas and by the rise of the temperature of the material itself, and it thus provides the apparatus in which the amount of gas to be used is greatly economized by the provision of multiple stages for the fluidization of the pulverant material wherein heat exchanger means are installed and hot gas is supplied.
  • the polymer with a primary equilibrium moisture content which is continuously fed from the uppermost drying chamber I is fluidized and, at the same time, dried with heat as it passes through the fluidizing gas and heatexchanger means 4,4 and 4''.
  • the polymer advances through the drying chambers I, II and III wherein the passages for the material are provided counter to those for the hot gas, and comes into contact with gas with lower degrees of humidity in the lower chambers. After a predetermined period of residence, the polymer dried to a desired degree is discharged out of the system.
  • the temperatures of the heat exchanger means 4, 4' and 4" are progresssively increased in the upper stages so that the pulverant material can be dried up smoothly.
  • the pulverant material drying apparatus can most effectively use up the heat amount of the material particles, hot gas, and heat exchanger means.
  • advantages of the invention are the use of a remarkably reduced amount of hot gas and the consequent compactness of the construction.
  • An apparatus for drying pulverant materials having about 30 to 45% water base having means for downwardly feeding the moisture-containing pulverant materials through successive vertical treating zones while upwardly counterflowing a hot gas having successively lower degrees of humidity, said means comprising in combination:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
US832167A 1968-06-19 1969-06-11 Apparatus for drying pulverant materials Expired - Lifetime US3611585A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP43042362A JPS491502B1 (de) 1968-06-19 1968-06-19

Publications (1)

Publication Number Publication Date
US3611585A true US3611585A (en) 1971-10-12

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US832167A Expired - Lifetime US3611585A (en) 1968-06-19 1969-06-11 Apparatus for drying pulverant materials

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US (1) US3611585A (de)
JP (1) JPS491502B1 (de)
BE (1) BE734852A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793743A (en) * 1972-08-23 1974-02-26 Waagner Biro American Apparatus for drying coal
US3804581A (en) * 1970-12-16 1974-04-16 Metallgesellschaft Ag Process of thermally treating fine-grained solids in an internally heated fluidized bed
FR2342763A1 (fr) * 1976-03-02 1977-09-30 Kulling Hanspeter Procede et appareillage pour extraire un liquide evapore d'un courant de gaz, par exemple dans un processus de traitement base sur le principe de lit fluidise
US4330411A (en) * 1979-05-28 1982-05-18 Escher Wyss Limited Process for treating clarified sludge
EP0064616A2 (de) * 1981-05-07 1982-11-17 Krupp Koppers GmbH Einrichtung zum Trocknen und Vorerhitzen von Kokskohle
EP0066096A2 (de) * 1981-05-29 1982-12-08 Krupp Koppers GmbH Verfahren zur gleichzeitigen thermischen Behandlung mehrerer Kohleströme
EP0407278A1 (de) * 1989-07-06 1991-01-09 François Laurenty Trocknungsturm für körnige Produkte
EP4105584A1 (de) * 2021-06-15 2022-12-21 Mini Green Power Universeller autonomer mehrstufiger trocknungsapparat mit brandschutzsystem, der für schlämme und feuchte feststoffe geeignet ist

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804581A (en) * 1970-12-16 1974-04-16 Metallgesellschaft Ag Process of thermally treating fine-grained solids in an internally heated fluidized bed
US3793743A (en) * 1972-08-23 1974-02-26 Waagner Biro American Apparatus for drying coal
FR2342763A1 (fr) * 1976-03-02 1977-09-30 Kulling Hanspeter Procede et appareillage pour extraire un liquide evapore d'un courant de gaz, par exemple dans un processus de traitement base sur le principe de lit fluidise
US4330411A (en) * 1979-05-28 1982-05-18 Escher Wyss Limited Process for treating clarified sludge
EP0064616A2 (de) * 1981-05-07 1982-11-17 Krupp Koppers GmbH Einrichtung zum Trocknen und Vorerhitzen von Kokskohle
EP0064616A3 (en) * 1981-05-07 1984-04-04 Krupp-Koppers Gmbh System for drying and preheating coke coal
EP0066096A2 (de) * 1981-05-29 1982-12-08 Krupp Koppers GmbH Verfahren zur gleichzeitigen thermischen Behandlung mehrerer Kohleströme
EP0066096A3 (en) * 1981-05-29 1984-03-28 Krupp-Koppers Gmbh Process for the simultaneous heat treatment of several coal streams
EP0407278A1 (de) * 1989-07-06 1991-01-09 François Laurenty Trocknungsturm für körnige Produkte
FR2652153A1 (fr) * 1989-07-06 1991-03-22 Laurenty Francois Procede et tour de sechage de produits en grains.
US5111596A (en) * 1989-07-06 1992-05-12 Francois Laurenty Drying process and tower for products in grain form
EP4105584A1 (de) * 2021-06-15 2022-12-21 Mini Green Power Universeller autonomer mehrstufiger trocknungsapparat mit brandschutzsystem, der für schlämme und feuchte feststoffe geeignet ist

Also Published As

Publication number Publication date
BE734852A (de) 1969-12-01
JPS491502B1 (de) 1974-01-14

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