EP0500636A1 - Dipositif de chauffage d'un flux continu de matiere fluidisee a l'aide d'un rayonnement infrarouge et d'air prechauffe. - Google Patents

Dipositif de chauffage d'un flux continu de matiere fluidisee a l'aide d'un rayonnement infrarouge et d'air prechauffe.

Info

Publication number
EP0500636A1
EP0500636A1 EP90916465A EP90916465A EP0500636A1 EP 0500636 A1 EP0500636 A1 EP 0500636A1 EP 90916465 A EP90916465 A EP 90916465A EP 90916465 A EP90916465 A EP 90916465A EP 0500636 A1 EP0500636 A1 EP 0500636A1
Authority
EP
European Patent Office
Prior art keywords
energy
heat
stream
exhaust gases
process medium
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.)
Granted
Application number
EP90916465A
Other languages
German (de)
English (en)
Other versions
EP0500636B1 (fr
Inventor
Mikael Kau
Lars Christensen
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.)
Cimbria Unigrain Ltd AS
Original Assignee
Cimbria Unigrain Ltd AS
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 Cimbria Unigrain Ltd AS filed Critical Cimbria Unigrain Ltd AS
Publication of EP0500636A1 publication Critical patent/EP0500636A1/fr
Application granted granted Critical
Publication of EP0500636B1 publication Critical patent/EP0500636B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • F26B3/305—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements the infrared radiation being generated by combustion or combustion gases
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating

Definitions

  • the invention relates to an apparatus for continuous intensive heat-treatment of a stream of material consisting of granular or highly viscous substances.
  • Heat treatment of granular or highly viscous substances such as grain, other vegetable seed crops, nuts, spices, flavourings, meat, bone pieces as well as porridge-like and pasty substances and the like is well-known technology.
  • the purpose of a heat-treatment of e.g. the above-mentioned materials may be dehydration (drying), germ reduction, sterilizing as well as developing e.g. positive effects with regard to digestibility, or other expedient chemical, bio-chemical and/or physical changes etc., and further, combinations of the above examples.
  • the supply of energy advantageously can take place in co-current with the stream of material by means of a combination of intense radiant heat from a flame body and/or a heated surface, as well as convective heat transmission from the exhaust gases and heated air.
  • the known technology is, however, limited by the fact that the exhaust gases from the combustion process make contact with the product being treated in a state, where they are more or less diluted with air.
  • the apparatus according to the invention overcomes these drawbacks, as the effect of radiant heat liberated by the combustion process is utilized to the full for intense heat transmission, at the same time as the exhaust gases do not make contact with the products being treated.
  • Figure 1 shows the heating unit according to the invention.
  • a burner 1 solid, liquid or gaseous fuel is burned with surplus of air, so that the combustion zone 2 (the flame) has an average temperature in the interval 400°C to 1200°C, preferably 600-1000°C.
  • the combustion takes place in a burner tube 3 being insulated internally with a refractory material, so that the heat transmission from the inner wall of the burner tube to its outer wall is minimized.
  • the energy liberated by the combustion will mainly be carried to the mouth of the burner tube and out into the inner part 4 of a thin-walled chamber 5.
  • the chamber 5 may be shaped like a cylinder with a bottom shaped like a part-spherical surface, and may consist of a highly refractory material (metal or ceramics).
  • the chamber 5 will be heated in the interval 400°C to 1200°C, preferably 600-1000°C, and emit heat radiation from the external part of the chamber.
  • the exhaust gases will pass in an interspace 6 between the outside of the burner tube and the chamber 5, e.g. the cylindrical part, referred to below as the primary convective heat exchanger 7.
  • the exhaust gases may be assured a turbulent flow by means of guide plates of the like, so that the contact with the primary convective heat exchanger is maximized.
  • the exhaust gases leave the primary convective heat exchanger 7 by means of suction, and may be further cooled down in one or more external secondary convective heat exchangers 8.
  • the gaseous process -medium e.g. atmospheric air
  • the gaseous process -medium is taken in at 19 by means of the fan 18, and is heated in one or more convective heat exchangers 8, before e.g. the air passes between the refractory primary convective heat exchanger 7 and the manifold 21, and is made to flow into the process chamber 11.
  • the air can be assured a turbulent flow by means of guide plates or the like, so that the contact with the primary convective heat exchanger is maximized.
  • the material to be processed according to the invention is taken in at the inlet chute or skid 10 in the rotating chamber 11.
  • the material is held in a mechanically fluidized state, and is moved from the inlet chute or skid 10 to the ejecting box 12.
  • the material In the inlet end of the rotating chamber 11, the material is subjected to intense heat, partly in the form of radiant heat emitted by the chamber 5, partly in the form of convective energy transmission from the heated gaseous process medium.
  • the intensity of the action of heat upon the material diminishes concurrently with the movement of the material from the inlet end, at the inlet chute or skid 10, towards the outlet end at the ejecting box 12.
  • the transmission of heat from the chamber 5 to the stream of material diminishes concurrently with the units of the material, e.g. the particles, casting their shadows upon each other, and the temperature of e.g. the particles rises.
  • the transmission of heat from the heated gaseous process medium to the stream of material diminishes concurrently with the process medium being cooled and the temperature of e.g. the particles rises.
  • the material and the process medium are separated according to known principles in the ejecting box 12, and the material is taken out through the air-tight lock chamber 13.
  • the cooled process medium is made to flow through the tube 14 to the cyclone 15, in which any powdery constituents are separated out according to known principles, after which it is further cooled, possibly together with the exhaust gases, in a secondary heat exchanger 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Drying Of Solid Materials (AREA)
  • Incineration Of Waste (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Fertilizers (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Abstract

Dans un appareil de traitement thermique continu, un courant fluidisé mécaniquement de matière composé de préférence d'une matière granulaire ou hautement visqueuse, est chauffé dans une chambre rotative en convergence avec une énergie thermique provenant d'un brûleur (1) dans lequel un combustible solide, liquide ou gazeux est brûlé. Une partie de l'énergie libérée par la combustion chauffe la partie intérieure d'une chambre (5) à paroi mince dont la partie extérieure située au niveau de l'admission (10) de matière, transfère de l'énergie audit courant de matière, sous forme de chaleur rayonnante. La partie restante de l'énergie libérée par la combustion retenue dans les gaz d'échappement provenant du procédé de combustion, est soumise à un échange thermique dans un échangeur thermique primaire (7) à convexion, et dans un ou plusieurs échangeurs thermiques secondaires (8), à contre-courant avec un milieu de traitement gazeux, de préférence de l'air atmosphérique, ledit milieu de traitement transférant d'avantage l'énergie audit courant de matière, sous forme d'énergie de convexion.
EP90916465A 1989-11-13 1990-11-08 Dipositif de chauffage d'un flux continu de matiere fluidisee a l'aide d'un rayonnement infrarouge et d'air prechauffe Expired - Lifetime EP0500636B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK565889A DK168319B1 (da) 1989-11-13 1989-11-13 Apparat til opvarmning af fødevaremateriale
DK5658/89 1989-11-13

Publications (2)

Publication Number Publication Date
EP0500636A1 true EP0500636A1 (fr) 1992-09-02
EP0500636B1 EP0500636B1 (fr) 1993-05-12

Family

ID=8144273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90916465A Expired - Lifetime EP0500636B1 (fr) 1989-11-13 1990-11-08 Dipositif de chauffage d'un flux continu de matiere fluidisee a l'aide d'un rayonnement infrarouge et d'air prechauffe

Country Status (5)

Country Link
EP (1) EP0500636B1 (fr)
AT (1) ATE89395T1 (fr)
DE (1) DE69001612T2 (fr)
DK (2) DK168319B1 (fr)
WO (1) WO1991007631A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854337A1 (fr) * 1997-01-16 1998-07-22 René Besnard Dispositif de séchage de récoltes
WO1999042776A1 (fr) * 1998-02-23 1999-08-26 Biokasvu Oy Appareil et procede continu de traitement thermique d'une masse
US9302231B2 (en) 2012-04-03 2016-04-05 Dubois Agricultural Engineering Incorporated Seed treating device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK527683A (da) * 1983-11-17 1985-09-02 Dantoaster Aps Fremgangsmaade til varmebehandling af materiale i partikelform og varmeovn til brug ved udoevelse af fremgangsmaaden

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9107631A1 *

Also Published As

Publication number Publication date
ATE89395T1 (de) 1993-05-15
DK0500636T3 (da) 1993-06-07
DK565889A (da) 1991-07-08
DK565889D0 (da) 1989-11-13
DE69001612T2 (de) 1993-08-19
DE69001612D1 (de) 1993-06-17
DK168319B1 (da) 1994-03-14
WO1991007631A1 (fr) 1991-05-30
EP0500636B1 (fr) 1993-05-12

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