US3840337A - Rotatable drying drum - Google Patents

Rotatable drying drum Download PDF

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Publication number
US3840337A
US3840337A US00368043A US36804373A US3840337A US 3840337 A US3840337 A US 3840337A US 00368043 A US00368043 A US 00368043A US 36804373 A US36804373 A US 36804373A US 3840337 A US3840337 A US 3840337A
Authority
US
United States
Prior art keywords
drying drum
burners
material lifting
cylindrical sidewall
lifting members
Prior art date
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
Application number
US00368043A
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English (en)
Inventor
C Heise
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19722227792 external-priority patent/DE2227792C3/de
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3840337A publication Critical patent/US3840337A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F26B11/0445—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 having conductive heating arrangements, e.g. heated drum wall

Definitions

  • a rotatable drying drum is provided with a drum wall having insertions and a combustion means for natural [52] US. Cl. 432/105, 432/111 or liquid gas so that stone minerals can be dried and [51] Int. Cl. F27b 7/10, F27b 7/14 heated for the preparation of bituminous building ma- [58] Field of Search 432/103, 105, 112, 119, terials.
  • the combustion means includes a pluralityvof 432/111 individual burners which are located in an end region of the drying drum.
  • This invention is related to a rotatable drying drum for drying and heating stone materials for the preparation of bituminous building materials.
  • the drying drum has a drum wall that is provided with insertions and has a combustion means for natural or liquid gas.
  • drying drums are well-known. They serve to dry and to heat stone minerals of the different grain sizes. During the manufacturing process of bituminous building ma terials, bitumen and other materials are added to the heated stone minerals.
  • Drying drums of this kind are operated in the onedirection mode as well as in the counter-current mode.
  • a burner that is directed into the interior of the drum and that, for example, can be heated with oil or gas.
  • the use of fuel oil is an angle of about 45 with respect to a tangent to the cylindrical wall of the drying drum. Insertions comprising relatively small boxes are provided between the burners, while that part of the cylindrical wall of the drying drum not occupied by burners has insertions comprising relatively large boxes.
  • the individualburners have separate outlet cross sections for the gas and the combustion air.
  • the inventive rotating drying drum has several advantages over the prior art. By dividing the combustion means into a plurality of individual burners a better control of the combustion process is possible. For example, it is possible to combust without excessive air,
  • the exhaust gases should not contain sulphurous or phosphorous compounds.
  • this object is achieved by providing a rotatable drying drum with combustion means composed of a plurality of individual burners that are'located in a final region of the drying drum.
  • the individual burners of the combustion means are located in the region of the front wall and the adjacent cylindrical wall of the drying drum. According to a preferred embodiment, about half the length of the cylindrical wall of the drying drum is occupied by individual burners. In the region of the cylindrical wall of the drying drum, each of the individual burners is inclined against the direction of rotation of the drying drum at while the preparation of the gas/air mixture can be accomplished substantially more accurately than with the prior art. Furthermore, a large surface of flames is pro vided in order to achieve a good heat transfer.
  • the heat has to be transferred substantially by convection. This is achieved by using insertions that comprise relatively large lifting boxes and therefore effect an intensive movement of the materials to be heated.
  • the stone minerals are picked up by the boxes and are moved in a free fall.
  • convective heat is transferred by the heating ga s to the stone minerals.
  • the permanently free-burning burners in the upper region of the drying drum prevent an expiration of ignition of v the ignitable gas/air mixture in the part of the drum that is covered by stone minerals since the free-burning burners permanently act as ignition burners.
  • the drying drum is constructed in a usual manner. It has a cylindrical side wall 1 with end regions'which pass over into back and front walls 2 and 3.
  • the drying drum is located in a substantially horizontal or slightly inclined-position. It is rotatable and has a usual drive means.
  • a material inlet is provided in the back wall 2 as indicated by the arrow 4, and a material outlet for the dried andheated stone as indicated by invention, a plurality of individual burners 6 are provided in the region of the material outlet when the drying drum is operated in the countercurrent mode.
  • the individual burners 6 are distributed over the front wall 3 and over about half of the length of the cylindrical wall 1 of the drying drum. Between the burners 6 are insertions 7 comprising relatively small lifting boxes. In the remaining part of the drum, which is not 1 will be opposite from that indicated in the drawing.
  • combustion means be subdivided into a plurality of individual burners in order to,
  • said drying drum includes a cylindrical sidewall and a pair of end walls adjoining opposite ends of said cylindrical sidewall, said pair of material transfer ports is positioned in said end walls, said first plurality of material lifting members obtained with the combustion.
  • a good control capability of the combustion means allows the specific treatment of each grain size. In summary, the heat transfer is substantially improved such that exhaust gases can also be purified without repeated cooling.
  • Apparatus for drying and heating stoneminerals for the preparation of bituminous building materials comprising a rotatable drying drum, a pair of material transfer ports positioned in a pair'of opposite end portions of said drying drum, a first plurality of material lifting members mountedwithin said drying drum-along a first side portion thereof adjoining one of said end portions, a second plurality of smaller material lifting members mounted within said drying drum along is mounted along a first portion of said cylindrical sidewall adjoining one of said end walls, said second plurality of smaller material lifting members is mounted along a second portion of said cylindrical sidewall adjoining the other of said end wallsfand said plurality of individual burners is mounted along said second portion of said cylindrical sidewall and said other end wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Incineration Of Waste (AREA)
  • Road Paving Machines (AREA)
US00368043A 1972-06-08 1973-06-07 Rotatable drying drum Expired - Lifetime US3840337A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722227792 DE2227792C3 (de) 1972-06-08 Trockentrommel zur Trocknung und Erwärmung von bituminösen Baustoffen

Publications (1)

Publication Number Publication Date
US3840337A true US3840337A (en) 1974-10-08

Family

ID=5847101

Family Applications (1)

Application Number Title Priority Date Filing Date
US00368043A Expired - Lifetime US3840337A (en) 1972-06-08 1973-06-07 Rotatable drying drum

Country Status (10)

Country Link
US (1) US3840337A (xx)
JP (1) JPS532221B2 (xx)
CH (1) CH557012A (xx)
DK (1) DK135178C (xx)
ES (1) ES415668A1 (xx)
FI (1) FI56747C (xx)
FR (1) FR2188124B1 (xx)
GB (1) GB1379345A (xx)
IT (1) IT988801B (xx)
NL (1) NL7307932A (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5744184A (en) * 1993-09-02 1998-04-28 Riviana Foods, Inc. Method for efficient utilization of water in processing food products
US5842285A (en) * 1994-10-18 1998-12-01 Gastec N.V. Gas-fired drying apparatus
US5852882A (en) * 1993-09-02 1998-12-29 Riviana Foods, Inc. Food drying apparatus
US5997930A (en) * 1993-09-02 1999-12-07 Riviana Foods, Inc. Method for processing rice

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59223064A (ja) * 1983-06-02 1984-12-14 Konishiroku Photo Ind Co Ltd 画像記録装置
JPS6039974A (ja) * 1983-08-12 1985-03-02 Konishiroku Photo Ind Co Ltd 画像記録装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5744184A (en) * 1993-09-02 1998-04-28 Riviana Foods, Inc. Method for efficient utilization of water in processing food products
US5852882A (en) * 1993-09-02 1998-12-29 Riviana Foods, Inc. Food drying apparatus
US5997930A (en) * 1993-09-02 1999-12-07 Riviana Foods, Inc. Method for processing rice
US6125550A (en) * 1993-09-02 2000-10-03 Riviana Foods, Inc. Food drying method
US5842285A (en) * 1994-10-18 1998-12-01 Gastec N.V. Gas-fired drying apparatus

Also Published As

Publication number Publication date
DE2227792B2 (de) 1975-07-31
DK135178B (da) 1977-03-14
CH557012A (de) 1974-12-13
FI56747B (fi) 1979-11-30
JPS5129765A (xx) 1976-03-13
FR2188124A1 (xx) 1974-01-18
GB1379345A (en) 1975-01-02
ES415668A1 (es) 1976-01-16
FR2188124B1 (xx) 1974-07-05
IT988801B (it) 1975-04-30
FI56747C (fi) 1980-03-10
JPS532221B2 (xx) 1978-01-26
DK135178C (da) 1977-08-15
NL7307932A (xx) 1973-12-11
DE2227792A1 (de) 1973-12-20

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