EP0168418B1 - A method and a device for drying a fibrous or granular material - Google Patents

A method and a device for drying a fibrous or granular material Download PDF

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Publication number
EP0168418B1
EP0168418B1 EP19850900250 EP85900250A EP0168418B1 EP 0168418 B1 EP0168418 B1 EP 0168418B1 EP 19850900250 EP19850900250 EP 19850900250 EP 85900250 A EP85900250 A EP 85900250A EP 0168418 B1 EP0168418 B1 EP 0168418B1
Authority
EP
European Patent Office
Prior art keywords
drying air
drying
rotary drier
drum
temperature
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
Application number
EP19850900250
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0168418A1 (en
Inventor
Stefan Rosendahl
Valter Burman
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.)
TARTAN KONSULT HB
Original Assignee
TARTAN KONSULT HB
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 TARTAN KONSULT HB filed Critical TARTAN KONSULT HB
Priority to AT85900250T priority Critical patent/ATE36552T1/de
Publication of EP0168418A1 publication Critical patent/EP0168418A1/en
Application granted granted Critical
Publication of EP0168418B1 publication Critical patent/EP0168418B1/en
Expired 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
    • F26B11/028—Arrangements for the supply or exhaust of gaseous drying medium for direct heat transfer, e.g. perforated tubes, annular passages, burner arrangements, dust separation, combined direct and indirect heating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10F—DRYING OR WORKING-UP OF PEAT
    • C10F5/00—Drying or de-watering peat

Definitions

  • This invention relates to a method for drying a fibrous or granular material, preferably peat, in a rotary drier, primary drying air being supplied to the drier axially and being substantially moisture saturated at its passage through the drier due to absorption of water from the material to be dried.
  • the invention also comprises a device for drying a fibrous or granular material.
  • a method and a device for drying wood chips and peat are previously known, the material being dried in a first space surrounding the space in which the final drying takes place.
  • This two-step drying requires a relatively complicated device, the handling of the peat being relatively circumstantial as the peat must be transferred to the internal space for final drying after pre-drying in the external space.
  • a device for continuous dewatering of peat is also known, where peat is supplied to a stationary, perforated drum, electric current being conducted through the peat, which will then give off water vapour. Air is fed into the drum, absorbs the water vapour and is pressed out through the perforations in the drum.
  • US-A-892 901 discloses a method and a device for drying fibrous or granular material in a rotary drier whereby drying air is supplied radially to a drum through a great number of holes in the mantle of the rotary drier and the temperature is raised before introduction into the rotary drier by passing a number of heating pipes.
  • very high air temperatures about 140°C, are used which means that the drying is carried out rapidly and efficiently.
  • the drying air is substantially moisture saturated during the whole drying process the risk of so-called dust explosion is in principle eliminated.
  • Fig. 1 is shown schematically a longitudinal section of a drying unit according to the invention and Fig. 2 shows a section taken on the line 11-11 in Fig. 1.
  • the drying unit 1 shown in Figs 1 and 2 comprises a rotatry drier 2, which on its inside, see Fig. 2, is provided with flanges 3 ensuring good stirring of the material placed in the drum 2.
  • the drum 2 is preferably cylindrical and has a great number of holes 4 on its mantle surface. These holes have preferably a diameter of about 3 mm.
  • the rotary drier 2 has an inlet opening 5 and a discharge opening 6.
  • a great number of finned pipes 7 surround the drum 2 and are arranged at some distance from this. In operation of the drying unit 1 hot water or some other suitable medium is circulating in these finned pipes 7.
  • the drum 2 is supported by two bearings 8, which have the shape of rings running about the drum 2.
  • the drum 2 is rotatable within these bearings 8. This rotation is created by a drive source, e.g. an electric motor, and suitable transmitting means.
  • An insulated mantle 9 is also included in the drying unit 1, which mantle extends along the major portion of the drum 2, the inlet and outlet openings 5 and 6 however not being surrounded by the mantle 9. As is apparent from Figs. 1 and 2 the mantle 9 has an upwardly tapering inlet 10 for drying air.
  • the drying unit described above works in the following way.
  • the drying principle of the unit 1 is built on the fact that raw peat is dried in the rotary drier 2 by evaporation of the water bound in the peat.
  • the primary drying air supplied to the drum 2 axially at the inlet opening has a relatively high temperature, about 150°C, when entering the drum 2.
  • the supply of the primary drying air is preferably carried out by means of a fan not shown in the figures.
  • the drying air After the drying air has left the drum 2 via the outlet opening 6 it is dehydrated, e.g. in a heat exchanger or condenser not shown in the figures. After this the secondary drying air is blown via fans or the like (not shown) into the mantle 9 through the inlet opening 10.
  • the secondary drying air When the secondary drying air is supplied to the mantle 9 after the de- moistening, its temperature is down to about 50°C.
  • hot water or the like is circulating in the finned pipes 7, the temperature of the host water being of the order of 200°C.
  • the hot water in the finned pipes 7 can e.g. consist of cooling water from some plant, waste heat thus being utilized for heating the drying air.
  • the peat granulate obtained as the result of peat drying is extraordinarily well suited for automated solid fuel systems.
  • the drying air used with the drying process according to the claimed invention can be obtained in many ways.
  • a so-called hot air boiler is possible, which is e.g. fired with oil.
  • This boiler has then preferably a water-carried cooling system.
  • the heated air is used as primary drying air, but it can be mixed with the exhaust gases formed in the oil combustion. Cooling water from the boiler can be circulated in the finned pipes 7 for heating the secondary drying air.
  • the secondary drying is preheated in another way than through passage of the finned pipes.
  • the temperature of the secondary drying air can e.g. be raised in such a way that it passes through a hot air boiler.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Drying Of Solid Materials (AREA)
EP19850900250 1983-12-15 1984-12-17 A method and a device for drying a fibrous or granular material Expired EP0168418B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85900250T ATE36552T1 (de) 1983-12-15 1984-12-17 Verfahren und vorrichtung zum trocknen von faser- und teilchenmaterialien.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8306950 1983-12-15
SE8306950A SE441835B (sv) 1983-12-15 1983-12-15 Forfarande for torkning av fibrost eller kornigt material, foretredesvis torv

Publications (2)

Publication Number Publication Date
EP0168418A1 EP0168418A1 (en) 1986-01-22
EP0168418B1 true EP0168418B1 (en) 1988-08-17

Family

ID=20353751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850900250 Expired EP0168418B1 (en) 1983-12-15 1984-12-17 A method and a device for drying a fibrous or granular material

Country Status (5)

Country Link
EP (1) EP0168418B1 (sv)
DE (1) DE3473471D1 (sv)
FI (1) FI82860C (sv)
SE (2) SE8306950L (sv)
WO (1) WO1985002623A1 (sv)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE265602C (sv) *
US892901A (en) * 1906-11-22 1908-07-07 Philadelphia Textile Mach Co Rotary drying-machine.
DE1585888A1 (de) * 1967-09-21 1971-10-14 Passat Maschinenbau Gmbh Trommeltrockner fuer Waesche od.dgl.

Also Published As

Publication number Publication date
SE8306950L (sv) 1985-06-16
DE3473471D1 (en) 1988-09-22
FI82860B (fi) 1991-01-15
SE441835B (sv) 1985-11-11
WO1985002623A1 (en) 1985-06-20
SE8306950D0 (sv) 1983-12-15
EP0168418A1 (en) 1986-01-22
FI82860C (sv) 1991-04-25
FI844964L (fi) 1985-06-16
FI844964A0 (fi) 1984-12-14

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