CONTINUOUS METHOD AND APPARATUS FOR HEAT TREATMENT OF MASS

Title:

CONTINUOUS METHOD AND APPARATUS FOR HEAT TREATMENT OF MASS

Document Type and Number:

WIPO Patent Application WO/1999/042776

Kind Code:

A1

Abstract:

The method relates to a continuous method for heat treatment of mass. In the method, mass is supplied to a rotatable chamber (4) where it is stirred, thereby subjecting it to hot gas that is in the chamber (4). The treated mass is then dried and cooled in a drying section (11). The mass is heated by using a burner (9), the combustion gases of which are conveyed via a gas pipe (14) supplied through the chamber (4) into the drying section (11). The gas in the chamber (4) is indirectly heated through the walls of the gas pipe (14). In the drying section (11) the combustion gases are supplied to the mass to be treated. The invention further relates to a continuous apparatus for heat treatment of mass. The apparatus comprises a processing vessel (3) rotatable about its longitudinal axis, the vessel comprising a chamber (4) and a drying section (11). At one end of the chamber (4) there is a burner (9), the combustion gases of which are conveyed via a gas pipe (14). The gas pipe (14) is supplied through the chamber (4) and connected to the drying section (11).

Inventors:

TILKANEN JUHA (FI)

Application Number:

PCT/FI1999/000139

Publication Date:

August 26, 1999

Filing Date:

February 22, 1999

Export Citation:

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Assignee:

BIOKASVU OY (FI)
AMOMATIC OY (FI)
TILKANEN JUHA (FI)

International Classes:

A23K3/00; A23L3/18; A23L3/3409; A23L3/40; A23N17/00; F26B11/02; F26B11/04; (IPC1-7): F26B23/02; A23L3/18; F26B17/30

Domestic Patent References:

WO1985002248A1	1985-05-23
WO1991007631A1	1991-05-30
WO1993002330A1	1993-02-04

Foreign References:

EP0854337A1	1998-07-22
US4058907A	1977-11-22

Attorney, Agent or Firm:

KOLSTER OY AB (Iso Roobertinkatu 23 P.O. Box 148 Helsinki, FI)

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Claims:

CLAIMS

1.

A continuous method for heat treatment of mass, whereby the mass to be treated is supplied for the heat treatment to a chamber (4) <BR> <BR> rotatable about its longitudinal axis, the chamber (4) being incompletely filled with the mass in such a way that it contains mass and gas, the gas in the chamber (4) being heated and mixed with the mass in the chamber (4), c h a r a c t e r i z e d in that after the chamber (4) is arranged a drying section (11) into which the mass is supplied after the heat treatment; that the mass is heated by using a burner (9), the combustion gases of which are conveyed via a gas pipe (14) supplied through the chamber (4), the gases indirectly heating the gas in the chamber through the watts of the gas pipe ; and that the combustion gases coming from the gas pipe are supplied to the drying section at the other end of the pipe, thus allowing the combustion gases to come into contact with the mass in the drying section.

2.	A method according to claim 1, c h a r a c t e r i z e d in that the heat treatment is carried out by applying an air pressure higher than normal air pressure.

3.

A method according to claim 1 or 2, c h a r a c t e r i z e d in that scoops (16) are arranged on the inner circumference of the chamber (4), the scoops lifting, as a result of the rotation of the chamber (4), the mass to be treated with heat upwards from the bottom of the chamber (4), a thin veil of mass then flowing from the scoops (16) back to the lower part of the chamber (4) through a hot layer of gas in the chamber (4).

4.	A method according to claim 3, c h a r a c t e r i z e d in that the mass is supplied to the processing apparatus in such a way that its degree of fullness is from 10 to 20%.

5.

A continuous apparatus for heat treatment of mass, the apparatus comprising a heatable chamber (4) rotatable about its longitudinal axis for the heat treatment of mass; means for heating gas that the chamber contains; and also means for mixing the mass to be treated with the hot gas in the chamber, the hot gas being arranged to heat the mass to be treated, c h a r a c t e r i z e d in that one end of the chamber (4) is provided with a burner (9); that a gas pipe (14) is supplied through the chamber, the combustion gases of the burner being conveyed via the pipe in such a way that they indirectly heat the gas in the chamber (4) through the wall of the gas pipe; that the other end of the chamber (4) is provided with a drying section (11) into which the mass is arranged to be supplied after the heat treatment; and that the gas pipe (14) is interconnected with the drying section (11) to allow the combustion gases to come into contact with the mass in the drying section.

6.	An apparatus according to claim 5, c h a r a c t e r i z e d in that it comprises means for pressurizing the chamber (4).

7.	An apparatus according to claim 5 or 6, c h a r a c t e r i z e d in that the chamber (4) and the drying section (11) are interconnected and arranged to rotate together.

8.	An apparatus according to any one of claims 5 to 7, characterized in that scoops (16) are arranged on the inner circumference of the chamber (4), the scoops being arranged to stir the mass to be heat treated as a result of the rotating of the chamber (4).

9.

An apparatus according to any one of claims 5 to 8, c h a r a c t e r i z e d in that the chamber (4) is divided into smaller spaces in the direction of flow of the mass to be treated by using flow control plates (15) and that the scoops (16) are arranged to move the mass, one space at a time, from the front end of the chamber (4) towards its rear end.

10.

An apparatus according to any one of claims 5 to 9, c h a r a c t e r i z e d in that the drying section is divided into smaller spaces in the direction of flow of the mass to be treated by using flow control plates (15) and that the scoops (16) are arranged to move the mass, one space at a time, from the front end of the drying section towards its rear end.

11.	An apparatus according to any one of preceding claims 5 to 10, characterized in that the apparatus comprises means for recovering the heat that is in the gases sucked from the rear end of the drying section (11) and to use them for preheating water and air needed in the process.

Description:

INTERNATIONAL SEARCH REPORT International application No. PCT/FI 99/00139 A. CLASSIFICATION OF SUBJEC1 INIA'ItI'E, R IPC7: F26B 23/02, F26B 17/30, A23L 3/18//A23K 1/00, A23N 17/00 According to international Patent Classification (Il'C) or to both national ca B. FIELDS SEARCHED Minimum documentation searched (classification system Mowed by ctassification symbols) IPC7 : A23L, A23K, A23N, F26B Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched SE, DK, FI, NO classes as above Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) WPI EDOC C.DOCUMENTS CONSIDERED'10 BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to clairs No. P, A EP 0854337 A1 (BESNARD, RENE), 22 July 1998 1-11 (22.07.98), abstract A WO 8502248 Al (DANTOASTER APS), 23 May 1985 1-11 (23.05.85), figure 2 A WO 9107631 Al (CIMBRIA UNIGRAIN LTD. A/S), 30 May 1-11 1991 (30.05.91), page 3, line 19-page 6, line 20, abstract A US 4058907 A (LIPP ET AL), 22 November 1977 1-11 (22.11.77), abstract Furtttcr documents are listed in thc continuation of'E3ox C. See patent farnily alnex. Special categories of'cited documents : later document published after international filing datepr ir "A"document defining the general state of the art which,. not considered -"'"'-'.'""', PP"'"but cited to underhand' to be of particular relevance thc pnnaplc or thezlr>-underlpng the mnentzon E erlier document but published on or after the international i ; ling date'X document of particular rclcvance : thc claimed invention cannot he "L"document which may throw doubts on pnonty cla. (s) or h. ch. s considered novei < r cannot he c. msidered to. nvolve an invenhve stcp uhcn thc dncumcnt it takcn alonc cited to establish the publication date of another citation or other special reason (as specified) l ° document of particular rclevance : the claimed invention cannot he "0"document referring to an oral disclosure, use. cxhihition or o-her considered to im c) ine an im entl e step when the document is means combined s h on or more other such documents, such combla'jan "P"document published prior to the international filtng da ; c hut later than hcing ohvious to a person skilled in the art the priority date claimed document member of the same patent family Date of the actual completion of the international search Date of mailing of the international search report 2 3 FEB 2000 23 February 2000 Name and mailing address of the ISA Authorized onicer Swedish Patent Office Box 5055, S-102 42 STOCKHOLM Inger Lofgren Facsimile No. + 46 8 666 02 86Telephone No. + 40 8 7S2 25 UO INTERNATIONAL SEARCH REPORT Internationa) application No. PCT/FI99/00139 C (Continuation). DOCUMEN'I'S CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant. passages Relevant to clairn No. A WO 9302330 Al (CIMBRIA UNIGRAIN LTD. A/S), 1-12 4 February 1993 (04.02.93), abstract INTERNATIONAL SEARCH REPORT International application No. Information on patent family members 03/05/99 PCT/FI 99/00139 Patent document | Publication Patent family | Publication cited in search report member (s) date l EP 0854337 Al 22/07/98 NONE WO 8502248 Al 23/05/85 AU 3673184 A 03/06/85 DK 527683 A 02/09/85 EP 0162089 A 27/11/85 WO 9107631 Al 30/05/91 AT 89395 T 15/05/93 DK 168319 B 14/03/94 DK 500636 T 07/06/93 DK 565889 A 08/07/91 EP 0500636 A, B 02/09/92 US 4058907 A 22/11/77 DE 2454208 A, C 26/05/76 GB 1522969 A 31/08/78 WO 9302330 Al 04/02/93 AU 2438592 A 23/02/93 DK 138991 A 25/01/93 1 :.,..., ur--r to, , n n. ..... _.. c... _....... _.,. i, __., ....,-

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