US3742611A - Drying process and spray dryer for carrying out the process - Google Patents

Drying process and spray dryer for carrying out the process Download PDF

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Publication number
US3742611A
US3742611A US00168117A US3742611DA US3742611A US 3742611 A US3742611 A US 3742611A US 00168117 A US00168117 A US 00168117A US 3742611D A US3742611D A US 3742611DA US 3742611 A US3742611 A US 3742611A
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US
United States
Prior art keywords
spray dryer
drum
impeller
dryer according
drying
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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
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US00168117A
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English (en)
Inventor
H Koller
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Buss AG
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Buss AG
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Filing date
Publication date
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Publication of US3742611A publication Critical patent/US3742611A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/16—Evaporating by spraying
    • B01D1/18—Evaporating by spraying to obtain dry solids

Definitions

  • ABSTRACT [30] Foreign Application Priority Data Apparatus and method for drying suspensions. solu- Aug. 5, I970 Switzerland l I875/70 and free Wing materials in a drying chamber in g v a cylindrical housing wherein the material is fed di- 521 vs. c
  • F26b 5/08 Scraping means is used against a rotating dFum 5s 1 Field of Search 34/8, 58 rounding the impeller which limits the size of the y g chamber, the dried material moving past a displace- 5 References Cited ment element within the drum which curves out coni- UNITED STATES PATENTS cally from the impeller toward the end of the cylindrical housing. 2,634,512 4/l953 Irving 34/58 2,744,338 13 Claims, 1 Drawing Figure
  • the present invention refers to a drying process as well as to a spray dryer for the drying of suspensions, solutions, pasty materials and free-flowing or similar materials.
  • the drying process is carried out in a drying housing, in which an axial flow of a drying medium prevails on the periphery. Accordingly the spray dryer exhibits a cylindrical housing with an inlet for the drying medium at one end and an outlet for the dried material and for the drying medium at the other end.
  • an impeller 7 is arranged which rotates on shaft 8 of a driving mechanism 9.
  • the driving mechanism 9 is located inside housing 1 on the opposite side of the impeller to the tube-
  • the purpose of the invention is to avoid the described disadvantages and to propose a process as well as a spray dryer which are universally applicableand which permit an advantageous combination with afterdryer's as well, for example for subsequent vacuum dry-
  • pasty materials and free-flowing materials'in a housing within which an axial flow of the drying medium prevails on the periphery is, according to the invention, characterized by the fact that the material to be dried is fed under pressure directly into the drying housing parallel, to, but outside the flow of, the drying medium, is there reduced in size and is carried radially at increased speed directly into the flow of drying medium.
  • The, spray dryer for the drying of suspensions, solutions, pasty materials and free-flowing materials -exhibits a cylindrical housing 1,-the axis of which'runs horizontally, and which is equipped with a cooling jacket on its surface.
  • the front end 3 of the housing is provided with an opening, through which a horizontal hollow shaft is introduced, this shaftextending into the inside of housing 1 and serving to accept a tube-shaped casing 5 with screw conveyor 6.
  • Inside housing 1 and shaped casing 5. in accordance with the proposed invention, the inner end of the tube-shaped casing 5 extends into the impeller 7, so that materials which are not pumpable and which are difficult to convey are fed directly to impeller 7 by means of screw conveyor 6. This is not possible with present spray dryers, which are only suitable for pumpable pastes.
  • Thefend of the hollow shaft 4 which is located within housing 1 carries a drum 10, which can be arranged to rotate or to be stationary.
  • drum 10. rotates together with hollow shaft 4, which carries a driving gear wheel 11 and which is driven by means of chain 12.
  • the detailled design of the chain drive is not illustrated in the drawing and can be executed in known fashion.
  • the front end 3 of housing 1 is provided with a hotair supply line 13 and the cylindrical surface at the end opposite to front end 3 is provided with an outlet 14, through which the dried material is removed from the drying space in the form of an air suspension.
  • the outlet rim On the edge of the inner surface of drum 10, the outlet rim is formed as a baffle ring 16, and in drying space 15 there is a displacement element 15 which is shaped as a cone, in that it widens out from impeller 7 toward the end of cylindrical housing 1, and which simultaneously serves to accept the driving mechanism 9.
  • l8 designates a guide bafr'le of the displacement element 17.
  • lamellar scraping knives 19 which are formed as springs and which are mounted in a frame 20 of a vibrator 21.
  • the material to be dried is introduced through the tube-shaped casing 5 by means of screw conveyor 6 directly to impeller 7 in axial fashion; the impeller shreds it and slings it away finely divided. In this way it is even:
  • the particles leaving the impeller 7 fly against the inner wall:of the drum l0,- and the danger exists that they will stick there and bake on.
  • the lamellar scraping knives 19 are provided, against which the drum rotates. It is possible as well, however, to take the opposite approach and to arrange the scraping knives to rotate while the drum remains stationary. Since the scraping knives consist of individual resilient layers,
  • the drum itself can be manufactured quite simply from un-machined, cylindrically-rolledplate; any imbalance has only a nagligible effect on the drum bearmg.
  • the drum surface is cooled with cold air, which is supplied through a separate line 24 containing a throttling organ 25. Afterwards, the heated cooling air is mixed together with the drying air and fed to the drying space.
  • the described spray dryer is equipped with a paddle cascade arrangement, on which the paddle angle and pitch are adjustable by means of washers. Large cascades are divided into two or more sections, whereby the individual sections can be operated with different air temperatures. For instance, cooling air can be blown in through the outermost section in order to treat a product particularly gently.
  • the mentioned baffle ring 16 brings a further advantage, -in that the material is held back, extending the residence time and improving the intermixing of air and material.
  • the drying space is subdivided into two parts.
  • the undisturbed rotational turbulence prevails; in the rear part, the flow is disturbed by the exhaust through the outlet line 14.
  • the mentioned screening off is achieved through the conical shape of the displacement element 17, through the baffle ring 16 and through the guide baffle 18 in the neighborhood of the outlet opening .14. 7
  • the end flange 27 can be connected to housing 1 by means of a snap closure.
  • the end flange, .which supports the displacement element 17 and the organs 9 and 21, is then itself supported separately by a swivelling mount.
  • the driving mechanism 9 can be mounted on the material in-feed vantageously with an after-dryer.
  • the heat losses provement in which said impeller (7) rotates about a are reduced to advantage, and improved safety against the dreaded dust explosions and detonations, since the smaller volume makes possible an efficient, pressuretight construction, for which smaller openings for overpressure protection are sufficient.
  • a spray dryer for drying suspensions, solutions, pasty materials and free-flowing materials having a cylindrical housing with an impeller arranged within said housing and a drying chamber inside the housingwith an inlet at one end for the drying medium and an outlet at the other end for the material to be dried, the imhorizontal axis (8), a feeding device (5,6) preceeding the inlet for feeding the material to be dried and leading said material directly into the impeller (7), a rotating drum (10) arranged within the housing, which limits said drying chamber (15), scraping devices (19) which can be applied against the surface of said drum and a displacement element (17) arranged within the drum (10) which widens out conically from the impeller (7) toward the end of the cylindrical housing (1).
  • Spray dryer according to claim 1 wherein the feeding device comprises a tube-shaped casing (5) and, arranged inside thecasing, a screw conveyor (6) leading all the way to the impeller (7).
  • Spray dryer according to claim 1 wherein the internal surface of the drum (10) is equipped with a baffle ring (16).
  • Spray dryer according to claim 1 wherein, in the neighborhood of the outlet line (14), the displacement element (17) is provided with a guide baffle (l8).
  • Spray dryer according to claim 1 wherein the housing (1) is equipped with a cold air line (24) for cooling the drum surface.
  • Spray dryer according to claim 1 wherein the end of the drum (10) at the point where hot air enters,
  • pasty materials and free-flowing materials comprising the steps of, leading the materials into a feeding device into a drying chamber within a cylindrical housing with an inlet at one end for the drying medium and an outlet at the other end for the material to be dried, that improvement which consists of, directing the material against a rotating impeller with in a rotating drum 10) arranged within the housing, which limits said drying chamber (15), while applying scraping devices (19) which can be applied against the surface of said drum and passing the material past a displacement element (17) arranged within the drum (10) which widens out conically from the impeller (7) toward the end of the cylindrical housing (1

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Solid Materials (AREA)
US00168117A 1970-08-05 1971-08-02 Drying process and spray dryer for carrying out the process Expired - Lifetime US3742611A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1187570A CH505354A (de) 1970-08-05 1970-08-05 Zerstäubungstrockner

Publications (1)

Publication Number Publication Date
US3742611A true US3742611A (en) 1973-07-03

Family

ID=4377722

Family Applications (1)

Application Number Title Priority Date Filing Date
US00168117A Expired - Lifetime US3742611A (en) 1970-08-05 1971-08-02 Drying process and spray dryer for carrying out the process

Country Status (9)

Country Link
US (1) US3742611A (xx)
BE (1) BE770915A (xx)
CA (1) CA954443A (xx)
CH (1) CH505354A (xx)
DE (1) DE2138879A1 (xx)
FR (1) FR2101251B1 (xx)
GB (1) GB1364680A (xx)
IT (1) IT950508B (xx)
NL (1) NL7110780A (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171579A (en) * 1978-01-16 1979-10-23 Fives-Cail Babcock Installation for drying a liquid-containing particulate product
US4517752A (en) * 1983-06-27 1985-05-21 Machine Technology, Inc. Splash retarder
CN112546795A (zh) * 2020-12-10 2021-03-26 北京宝恒伟业厨房设备有限公司 撞击流式油烟净化设备
US11378334B2 (en) * 2020-05-14 2022-07-05 Standard Foods Corporation Spray drum system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634512A (en) * 1948-09-23 1953-04-14 Baker Perkins Inc Drier
US2716290A (en) * 1951-06-21 1955-08-30 Baker Perkins Inc Drier
US2744338A (en) * 1953-05-07 1956-05-08 Braunschweigische Maschb Nstal Apparatus for drying friable material
CH363941A (de) * 1957-12-02 1962-08-15 Karl Marx Stadt Maschf Kontinuierlich arbeitende Zentrifuge mit Infrarot-Nachtrockeneinrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634512A (en) * 1948-09-23 1953-04-14 Baker Perkins Inc Drier
US2716290A (en) * 1951-06-21 1955-08-30 Baker Perkins Inc Drier
US2744338A (en) * 1953-05-07 1956-05-08 Braunschweigische Maschb Nstal Apparatus for drying friable material
CH363941A (de) * 1957-12-02 1962-08-15 Karl Marx Stadt Maschf Kontinuierlich arbeitende Zentrifuge mit Infrarot-Nachtrockeneinrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171579A (en) * 1978-01-16 1979-10-23 Fives-Cail Babcock Installation for drying a liquid-containing particulate product
US4517752A (en) * 1983-06-27 1985-05-21 Machine Technology, Inc. Splash retarder
US11378334B2 (en) * 2020-05-14 2022-07-05 Standard Foods Corporation Spray drum system
CN112546795A (zh) * 2020-12-10 2021-03-26 北京宝恒伟业厨房设备有限公司 撞击流式油烟净化设备

Also Published As

Publication number Publication date
GB1364680A (en) 1974-08-29
CA954443A (en) 1974-09-10
FR2101251B1 (xx) 1973-06-29
FR2101251A1 (xx) 1972-03-31
IT950508B (it) 1973-06-20
BE770915A (fr) 1971-12-16
CH505354A (de) 1971-03-31
DE2138879A1 (de) 1972-02-10
NL7110780A (xx) 1972-02-08

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