US3222491A - Apparatus for continuous drying of powdery or granular materials in a highfrequency field - Google Patents

Apparatus for continuous drying of powdery or granular materials in a highfrequency field Download PDF

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Publication number
US3222491A
US3222491A US230203A US23020362A US3222491A US 3222491 A US3222491 A US 3222491A US 230203 A US230203 A US 230203A US 23020362 A US23020362 A US 23020362A US 3222491 A US3222491 A US 3222491A
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tube
dried
electrodes
longitudinal axis
high frequency
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US230203A
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English (en)
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Schmid Hans
Feldhoff Heinrich
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BASF SE
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BASF SE
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0495—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with provisions for drying by electro-magnetic means, e.g. radiation, microwaves

Definitions

  • This invention relates in general to high frequency drying equipment. More specifically, the invention relates to a tubular dryer comprising a tube made of insulating material, a feeder drum connected to and rotated with the tube, and adjustable electrodes.
  • the electrodes are capable of being inclined independently from each other with respect to the axis of rotation of the tube, so that the material to be dried can be treated intermittently Without the electric data of the high-freqeuncy generator having to be changed.
  • the inclination and speed of the rotating tube may be regulatable in order to adjust the'rate of flow of the material to be treated.
  • a feeder drum is provided which is fitted with baffles which make possiblea sufficiently uniform charging of the rotating tube.
  • FIGURE 1 is a diagrammatic elevation of one embodiment of apparatus according to this invention
  • FIGURE 2 shows diagrammatic sectional elevations of tubes and electrodes
  • FIGURE 3 is a diagrammatic elevation of part of a second embodiment of apparatus according to this invention.
  • the treatment chamber for the material to be dried consists of a circular tube 1.
  • the tube extends through apertures in two bearing plates 2 and 2 and is rotatably 3,222,491 Patented Dec. 7, 1965 mounted at the points of support, preferably in roller bearings.
  • the bearing plates 2 and 2 are in turn secured to a frame 3 suspended at one end from a hinge 4.
  • the other end of the frame is supported on a threaded spindle 5 to allow for raising and lowering the delivery end of the tube I mounted above the frame 3.
  • the tube 1 may be brought from the horizontal position into any inclined position within a range of about 0 to 15 so that the flow rate of the material being dried in the tube may be varied.
  • the feed-in end of the tube 1 carries a feeder drum 8 having a larger diameter than the tube 1 and consisting substantially of two superposed conical casings.
  • the free end of an inlet chute 9 of a hopper 9' projects into the outer free opening of the feeder drum 8 and feeds the material to be treated to the tube 1.
  • baflles 10 may be made with or without interruptions and lie on generating lines of the tube parallel to the axis of rotation or inclined thereto. In the latter case, the bafiles may be arranged in spiral fashion.
  • the baflles 10 may be integral therewith; in other cases they may be secured subsequently.
  • fillets preferably inclined, or curved blades 11, which serve to agitate the material to be treated and feed it positively, and are arranged and shaped like the blades in the drum of a concrete mixing machine. It is also advantageous to line the inner face of the tube 1 and the feeder drum 8 including the bafiles 10 and the fillets or blades 11 with a polytetrafluoroethylene sheet or a compound sheet of glass fiber reinforced polytetrafluoroethylene. The moist material to be treated then has less tendency to adhere to the inner face of the feeder drum and the treatment chamber. It is then agitated and conveyed better and more completely. Instead of lining the feed and treatment sections for the moist material, it is also possible to apply polytetrafiuoroethylene coating.
  • FIGURES 2 and 3 The arrangement of the electrodes 12 for producing the high freqeuncy field at the rotating tube 1 is shown in FIGURES 2 and 3.
  • the electrodes 12 are spaced from the outer surface of the tube by a distance x and curved according to the diameter of the tube. They are supported at both ends by arms 13 of insulating material which can be screwed to the bearing plates 2 and 2' at any angular position and distance from each other by means of a multiplicity of tapped holes in the bearing plates 2 and 2'.
  • Three different angular positions of the electrodes 12 which produce different drying effects and different electrical field strengths in the treatment zone are shown at a, b and c in FIGURE 2.
  • the electrodes may furthermore be adjusted to any other angular position relative to the axis of rotation of the tube 1 in an approximate range of 30 to
  • the arms 13 carrying the electrodes 12 may also be so connected with the bearing plates 2 and 2 that the distance x between the electrodes and the outer surface of the tube 1 may be varied within certain limits.
  • the tube used was a glass fiber reinforced polyester tube having a length of 3000 mm., a diameter of 280 mm. and a Wall thickness of 1 mm.
  • the inside of this tube was provided with four baflles having rectangular cross-section of 2 x 60 mm.
  • the tube was rotated at a speed of about 40 to 50 r.p.m. between two plate electrodes each having a surface area of 200 x 2000 mm., the plates being slightly curved in cross-section.
  • the space between the electrodes at the diametrie position with respect to the axis of rotation was 320mm.
  • a suction fan 14 was provided at the delivery end of the tube, the fan having the following performance data: air throughput 200 m. /hour, pressure 200 mm. water column.
  • a high frequency drying plant which comprises a tubular dryer according to this invention as its essential part also comprises the following other parts.
  • the delivery end of the tube 1 is located above a receptacle for the dried material.
  • the suction fan 14 for withdrawing steam and maintaining a slightly reduced pressure in the treatment zone it is also possible to provide at the top of the receptacle 15 a cyclone 16 or a similar separator which advantageously forms a single unit with the fan 14 (FIGURE 1). In this way, any material treated in the high frequency drying zone which is sucked away with the mixture of steam and air is collected in the separator. This feature is especially advantageous when the materials to be dried are dusty and toxic.
  • FIGURE 3 shows diagrammatically another arrangement at the delivery end of the tube 1.
  • the lower end of this separator 18 is in communication through a rotary air lock 20 with a receptacle 19.
  • the fan 14 in this case is again attached to the upper end of the receptacle 15 and provided with a separator 16.
  • Air sucked in by blower 17 to convey the material is not withdrawn from the tube 1 in this case, but is drawn in from the atmosphere through the funnel 17 so that the discharged material is cooled at the same time.
  • heat sensitive material which must be free from conglomerates when processed further, may be discharged and bagged direct from the storage container 19.
  • a drying and conveying cylindrical tube essentially composed of insulating material and mounted in a hori zontal to an inclined position for rotation about its longitudinal axis; means to rotate said tube and continuously convey the material to be dried therethrough in a constant direction from the inlet end of said tube to the outlet end;
  • a pair of opposing high frequency electrodes adjustably mounted in positions adjacent the outer circumferential surface of said rotating tube such that said electrodes can be adjustably disposed from each other by an angle of from about to 180 with reference to the longitudinal axis of rotation of said tube.
  • a drying and conveying cylindrical tube essentially composed of insulating material and mounted in a horizontal to an inclined position for rotation about its longitudinal axis;
  • a feeder drum rotatably mounted around said longitudinal axis in conjunction with said tube and formed substantially as a double truncated cone tapering outwardly from the inlet end of said cylindrical tube to the superimposed bases of the double cone, which bases have a diameter larger than the diameter of said tube, and then tapering inwardly to provide a feed opening in said drum, said drum being provided 'with projecting bafiies on the inner surface thereof running obliquely to the axis of said drum and adapted to continuously charge the material to be dried at a uniform rate into the inlet end of said tube;
  • a pair of opposing high frequency electrodes adjustably mounted in positions adjacent the outer circumferential surface of said roating tube such that said electrodes can be adjustably disposed from each other by an angle of from about 30 to with reference to the longitudinal axis of rotation of said tube.
  • a drying and conveying cylindrical tube essentially composed of insulating material and mounted for rotation about its longitudinal axis in plates attached to a supporting frame, said frame being hinged at one end for movement of said tube from a horizontal to inclined position;
  • a pair of opposing high frequency electrodes adjustably mounted at either end to said plates in positions adjacent the outer circumferential surface of said rotating tube such that said electrodes can be adjustably disposed from each other by an angle of from about 30 to 180 with reference to the longitudinal axis of rotation of said tube and also such that said electrodes can be adjustably disposed at varying distances from the outer circumferential surface of said tube,
  • a drying and conveying cylindrical tube essentially composed of a glass fiber reinforced unsaturated polyester resin as an insulating material and mounted in a horizontal to an inclined position for rotation about its longitudinal axis;
  • a pair of opposing high frequency electrodes adjustably mounted in positions adjacent the outer circumferential surface of said rotating tube such that said electrodes can be adjustably disposed from each other by an angle of from about 30 to 180 with reference to the longitudinal axis of rotation of said tube.
  • Apparatus for the continuous drying of a povvdery or granular material in a high frequency field comprising: a drying and conveying cylindrical tube essentially composed of insulating material and mounted in a horizontal to an inclined position for rotation about its longitudinal axis;
  • a pair of opposing high frequency electrodes adjustably mounted in positions adjacent the outer circumferential surface of said rotating tube such that said electrodes can be adjustably disposed from each other by an angle of from about 30 to 180 with reference to the longitudinal axis of rotation of said tube.
  • Apparatus for the continuous drying of a powdery or granular material in a high frequency field comprising: a drying and conveying cylindrical tube essentially composed of insulating material and mounted in a horizontal to an inclined position for rotation about its longitudinal axis;
  • feeder drum of greater diameter than said tube and provided with baffies on the inner surface thereof, said drum being rotatably mounted around said longitudinal axis in conjunction With said tube and adapted to continuously charge the material to be dried at a uniform rate into the inlet end of said tube;
  • a lining on the inner surfaces of said tube and said drum composed of glass fiber reinforced polytetrafluoroethylene;
  • a pair of opposing high frequency electrodes adjustably mounted in positions adjacent the outer circumferential surface of said rotating tube such that said electrodes can be adjustably disposed from each other by an angle of from about 30 to with reference to the longitudinal axis of rotation of said tube.
  • a drying and conveying cylindrical tu'be essentially composed of insulating material and mounted in a horizontal to an inclined position for rotation about its longitudinal axis;
  • a pair of opposing high frequency electrodes adjustably mounted in positions adjacent the outer circumferential surface of said rotating tube such that said electrodes can be adjustably disposed from each other by an angle of from about 30 to 180 with reference to the longitudinal axis of rotation of said tube and also such that said electrodes can be adjustably disposed at varying distances from the outer circumferential surface of said tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
US230203A 1961-10-17 1962-10-12 Apparatus for continuous drying of powdery or granular materials in a highfrequency field Expired - Lifetime US3222491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0064404 1961-10-17

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US3222491A true US3222491A (en) 1965-12-07

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US230203A Expired - Lifetime US3222491A (en) 1961-10-17 1962-10-12 Apparatus for continuous drying of powdery or granular materials in a highfrequency field

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US (1) US3222491A (de)
AT (1) AT240791B (de)
CH (1) CH398458A (de)
GB (1) GB963950A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4326114A (en) * 1978-12-11 1982-04-20 Gerling-Moore, Inc. Apparatus for microwave roasting of coffee beans
US4797524A (en) * 1985-05-20 1989-01-10 Compagnie Generale Des Matieres Nucleaires Apparatus and method for regenerating active carbon
WO1992022180A1 (en) * 1991-05-28 1992-12-10 Ib Obel Pedersen A method and an electrode system for heating media flowing through an insulating pipe
US20080060334A1 (en) * 2006-09-08 2008-03-13 Kido Duane R Systems and method for improving airflow in an onion topping device
US20080282573A1 (en) * 2007-05-14 2008-11-20 William Hein Tilting microwave dryer and heater
US20150351421A1 (en) * 2013-01-25 2015-12-10 Bühler Barth Gmbh Method and device for drying and/or roasting a food

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1972050A (en) * 1932-08-08 1934-08-28 Jesse H Davis High frequency method of and apparatus for exterminating insect life in seed or grain or other materials
GB517798A (en) * 1937-11-04 1940-02-08 Auguste Louis Marie Antoine Ro Improvements in and relating to processes and apparatus for the manufacture of agglomerates
US2415025A (en) * 1943-04-22 1947-01-28 Firestone Tire & Rubber Co Method and apparatus for treating matter in a high-frequency electric field
GB609192A (en) * 1945-03-27 1948-09-27 Standard Telephones Cables Ltd Improvements in or relating to high frequency heating
US2472370A (en) * 1945-01-08 1949-06-07 Cutler Hammer Inc Electrode for high-frequency heating of insulation preforms
US2479351A (en) * 1945-08-10 1949-08-16 Westinghouse Electric Corp High-frequency dielectric heating apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1972050A (en) * 1932-08-08 1934-08-28 Jesse H Davis High frequency method of and apparatus for exterminating insect life in seed or grain or other materials
GB517798A (en) * 1937-11-04 1940-02-08 Auguste Louis Marie Antoine Ro Improvements in and relating to processes and apparatus for the manufacture of agglomerates
US2415025A (en) * 1943-04-22 1947-01-28 Firestone Tire & Rubber Co Method and apparatus for treating matter in a high-frequency electric field
US2472370A (en) * 1945-01-08 1949-06-07 Cutler Hammer Inc Electrode for high-frequency heating of insulation preforms
GB609192A (en) * 1945-03-27 1948-09-27 Standard Telephones Cables Ltd Improvements in or relating to high frequency heating
US2479351A (en) * 1945-08-10 1949-08-16 Westinghouse Electric Corp High-frequency dielectric heating apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4326114A (en) * 1978-12-11 1982-04-20 Gerling-Moore, Inc. Apparatus for microwave roasting of coffee beans
US4797524A (en) * 1985-05-20 1989-01-10 Compagnie Generale Des Matieres Nucleaires Apparatus and method for regenerating active carbon
WO1992022180A1 (en) * 1991-05-28 1992-12-10 Ib Obel Pedersen A method and an electrode system for heating media flowing through an insulating pipe
US20080060334A1 (en) * 2006-09-08 2008-03-13 Kido Duane R Systems and method for improving airflow in an onion topping device
US20080282573A1 (en) * 2007-05-14 2008-11-20 William Hein Tilting microwave dryer and heater
US20150351421A1 (en) * 2013-01-25 2015-12-10 Bühler Barth Gmbh Method and device for drying and/or roasting a food

Also Published As

Publication number Publication date
AT240791B (de) 1965-06-10
GB963950A (en) 1964-07-15
CH398458A (de) 1966-03-15

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