EP0327717B1 - Procédé et installation pour le traitement thermique de produits en poudre - Google Patents

Procédé et installation pour le traitement thermique de produits en poudre Download PDF

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Publication number
EP0327717B1
EP0327717B1 EP88121322A EP88121322A EP0327717B1 EP 0327717 B1 EP0327717 B1 EP 0327717B1 EP 88121322 A EP88121322 A EP 88121322A EP 88121322 A EP88121322 A EP 88121322A EP 0327717 B1 EP0327717 B1 EP 0327717B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
combustion chamber
pipe
zone
calcination zone
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
EP88121322A
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German (de)
English (en)
Other versions
EP0327717A3 (en
EP0327717A2 (fr
Inventor
Manfred Dipl.-Ing. Dürr
Wolfgang Dipl.-Ing. Rother
Georg Dr.-Ing. Unland
Günter Dipl.-Ing. Driemeier
Heinz-Herbert Dipl.-Ing. Schmits
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
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Filing date
Publication date
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Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0327717A2 publication Critical patent/EP0327717A2/fr
Publication of EP0327717A3 publication Critical patent/EP0327717A3/de
Application granted granted Critical
Publication of EP0327717B1 publication Critical patent/EP0327717B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/2016Arrangements of preheating devices for the charge
    • F27B7/2025Arrangements of preheating devices for the charge consisting of a single string of cyclones
    • F27B7/2033Arrangements of preheating devices for the charge consisting of a single string of cyclones with means for precalcining the raw material

Definitions

  • the invention relates to a method (according to the preamble of claim 1) and a system (according to the preamble of claim 2) for the heat treatment of fine-grained material, in particular for firing cement.
  • the calcining zone is traversed by the exhaust gases from the combustion zone and by exhaust air from the cooling zone.
  • the preheated material is introduced into the exhaust air of the firing zone and fed to the calcining zone via this exhaust air.
  • the material to be calcined penetrates the calcining zone very quickly. As a result, there is little time available for transferring the thermal energy from the fuel to the material to be calcined.
  • the invention has for its object to provide a method (according to the preamble of claim 1) and a system (according to the preamble of claim 2) so that even with poorly igniting or difficult to burn out, especially low-quality fuel, an improved burnout in the calcining zone and a higher deacidification of the material to be calcined is achieved.
  • the part of the material to be recirculated is introduced into the cooling zone's exhaust air after passing through the calcining zone and is again fed to the calcining zone with this exhaust air from the cooling zone.
  • the material to be calcined and the solid fuel particles recirculated with the material, which have not yet completely burned out enter an oxygen-rich atmosphere at the same time as the temperature is high, after first passing through the calcining zone. This provides optimal conditions for a rapid complete burnout of the fuel and a high deacidification of the goods.
  • 1 contains a multi-stage preheater 1, of which only the bottom two cyclones 2 and 3 are shown.
  • the system contains a rotary kiln 4, which is connected to the bottom cyclone 2 of the preheater 1 via a furnace exhaust line 5 designed as a loop.
  • a calcining zone which is essentially formed by a combustion chamber 6, serves to heat and deacidify the material preheated in the preheater 1 (before the material enters the rotary kiln 4).
  • the upper area of this combustion chamber 6 is connected to a tertiary air line 7 which the combustion chamber 6 exhaust air from a (not shown in Fig.1) the rotary kiln 4 downstream cooler.
  • the tertiary air line 7 first branches into two branch lines 7a, 7b, of which the branch line 7a again divides into partial lines 7a ', 7a ⁇ .
  • the lines 7b and 7a ⁇ preferably open tangentially to the circumference of the combustion chamber 6, while the partial line 7a 'is connected to the ceiling of the combustion chamber 6.
  • Flaps 8, 9, 10 are provided for adjusting the air quantities in the individual lines 7a ', 7a ⁇ , 7b.
  • an exhaust gas connection 11 is provided, which opens into the furnace exhaust gas line 5.
  • This chimney-shaped exhaust port 11 also represents a first discharge port of the combustion chamber 6.
  • a second crop discharge connection 12 which is provided in the lower region of the combustion chamber 6, is connected to the branch line 7b of the tertiary air line 7 via a good line 13.
  • the good line 13 opens into the branch line 7b above a throttle point 14 provided in the branch line 7b.
  • the cyclones of the preheater 1 are known Way connected via their gas and good lines.
  • the good discharge line 15 of the third cyclone (not shown) opens into the gas line 16, which connects the lowermost cyclone 2 to the second lowermost cyclone 3.
  • the good discharge line 17 of the cyclone 3 opens into the partial line 7a ⁇ of the tertiary air line, while the good discharge line 18 of the cyclone 2 is connected to the inlet housing of the rotary kiln 4.
  • the rotary kiln 4 is heated in a known manner by a burner at the (not shown) discharge end of the furnace.
  • the combustion chamber 6 is also provided with at least one burner (not shown).
  • the material preheated in the preheater 1 passes via the product discharge line 17 of the cyclone 3 into the partial line 7a ⁇ of the tertiary air line 7 and is further heated and deacidified in the combustion chamber 6.
  • Part of the material is introduced from the combustion chamber 6 together with the exhaust gases from this combustion chamber via the exhaust gas connection 11 into the furnace exhaust gas line 5, separated from the gas stream in the cyclone 2 and fed to the rotary kiln 4 via the material discharge line 18.
  • Another part of the material heated and deacidified in the combustion chamber 6 is drawn off via the material discharge connection 12 and the material line 13 and introduced into the branch line 7b of the tertiary air line 7.
  • the tertiary air which passes through the throttle point 14 at high speed, the material supplied via the material line 13 is deflected and fed to the combustion chamber 6 again.
  • a certain part of the material calcined in the combustion chamber 6 therefore passes through the calcining zone several times, which leads to an overall extended residence time for both the material and the fuel used in the combustion chamber 6.
  • the exhaust gas connection 11, which also serves as a discharge port, and the further discharge connection 12 form a device for branching goods, which is expediently provided with suitable means (such as flaps) for achieving a desired distribution of goods.
  • the tertiary air line 7 is not branched.
  • the combustion chamber 6 is consequently provided only with a single air connection.
  • the material discharge line 17 of the cyclone 3 opens into the tertiary air line 7 near the combustion chamber 6.
  • the Gut effet 13 of the combustion chamber 6 is connected to the tertiary air line 7 just above the throttle 14.
  • the material recirculated via the good line 13 and the fuel that is not yet completely burned out in this good flow initially arrive in a good-free, very oxygen-rich air flow and are distributed evenly over the entire cross section therein, before (just before the confluence of the tertiary air line 7 in the combustion chamber 6) the preheated material supplied via the material discharge line 17 is introduced into this air stream which already contains the recirculated material.
  • the lower region of the combustion chamber 6 is connected via an exhaust port 11 'to the furnace exhaust line 5.
  • a separate material discharge connection 12' with a device 19 for branching out which is only indicated schematically. From this A device 19 (for example a distributor flap leads a good line 13 to the tertiary air line 7 and a good line 20 to the furnace exhaust line 5.
  • the function of the system according to FIG. 3 corresponds to the exemplary embodiment according to FIG. 2.
  • the material introduced from the combustion chamber 6 via the product line 20 into the furnace exhaust gas line 5 is separated from the gas stream in the cyclone 2 and then passed to the rotary kiln 4, while the material recirculated via the product line 13 and the tertiary air line 7 again passes through the combustion chamber 6.
  • the combustion chamber 6 has an exhaust gas connection 11, which at the same time forms the only good discharge connection of the combustion chamber and is connected to the furnace exhaust gas line 5.
  • the good discharge line 18 of the bottom cyclone 2 is connected to a device 21 for branching good, from which a good line 13 leads to the tertiary air line 7 and a good line 22 to the inlet housing of the rotary kiln 4.
  • the distribution of the material calcined in the combustion chamber 6 does not take place immediately after leaving the combustion chamber 6, but only after separation in the cyclone 2: the part of the material introduced into the tertiary air line 7 via the product line 13 is recirculated into the combustion chamber 6 (and also passes through the furnace exhaust pipe 5 and the Cyclone 2), while the remainder of the material reaches the rotary tube furnace 4 directly via the product line 22.
  • the furnace exhaust gas line 5 is also included in the recirculation.
  • the embodiment according to FIG. 5 corresponds to the variant according to FIG. 4 with the difference that a separate combustion chamber 6 is missing.
  • the calcining zone is formed here by the furnace exhaust line 5, the lower area of which is provided with one or more burners 23 for this purpose.
  • the tertiary air line 7 opens directly into the furnace exhaust line 5, expediently with a slightly downward inclination.
  • the preheated material supplied via the material discharge line 17 is introduced into the tertiary air line near the point at which the tertiary air line 7 opens into the furnace exhaust gas line 5.
  • the material discharged via the material discharge line 18 is branched in the manner already explained with reference to FIG. 4, the part recirculated via the material line 13 into the tertiary air line 7 again the calcining zone, i.e. passes through the furnace exhaust pipe 5.
  • combustion chamber 6 in which the combustion chamber 6 is provided as the calcining zone
  • one or more burners are provided in the lower region of the furnace exhaust gas line 5 in order to achieve an even higher deacidification of the material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Claims (10)

  1. Procédé de traitement thermique de matière à granulométrie fine, en particulier de cuisson de ciment, suivant lequel :
    a) la matière est réchauffée dans une zone correspondante par des gaz chauds,
    b) son chauffage et sa désacidification se poursuivent ensuite dans une zone de calcination à l'aide d'un complément de combustible,
    c) l'achèvement de la cuisson de la matière s'effectuant ensuite dans une zone correspondante,
    d) et finalement cette matière passe par une zone de refroidissement,
    e) l'air évacué de la zone de refroidissement formant l'air comburant qui est dirigé sur la zone de calcination,
    f) et une partie de la matière ayant passé par la zone de calcination étant renvoyée dans cette dernière afin d'y être recyclée,
       caractérisé en ce que
    g) la partie de la matière devant être recyclée et ayant passé par la zone de calcination est introduite dans l'air évacué de la zone de refroidissement et cet air la renvoie dans la zone de calcination.
  2. Installation de traitement thermique de matière à granulométrie fine, en particulier de cuisson de ciment comprenant
    a) un réchauffeur (1) de la matière en plusieurs étages,
    b) une zone (6) de calcination de la matière réchauffée,
    c) un four tubulaire rotatif (4) d'achèvement de la cuisson de la matière calcinée,
    d) un réfrigérant de refroidissement de la matière dont la cuisson est achevée,
    e) un dispositif de subdivision du flux de matière qui est monté en aval de la zone de calcination, par rapport au sens de circulation de la matière, et à partir duquel un premier raccord (11) dirige une partie de la matière sur le four tubulaire rotatif et un second raccord (12) dirige une autre partie de la matière dans la zone de calcination afin de l'y recycler,
    f) le réfrigérant étant relié par un conduit (7) d'air tertiaire à la zone de calcination et le réchauffeur étant balayé par les gaz chauds évacués du four tubulaire rotatif et de la zone de calcination,
       caractérisée en ce que
    g) le second raccord (12) du dispositif de subdivision du flux de la matière est relié au conduit d'air tertiaire.
  3. Installation selon la revendication 2, dans laquelle la zone de calcination est formée d'une chambre de combustion (6), dont le raccord (11) d'évacuation des gaz est relié au conduit (5) d'évacuation des gaz du four qui relie le four tubulaire rotatif (4) au cyclone inférieur (2) du réchauffeur, caractérisée en ce que la chambre de combustion (6) est reliée par le dispositif de subdivision du flux de matière d'une part au conduit (5) d'évacuation des gaz du four et d'autre part au conduit (7) d'air tertiaire.
  4. Installation selon la revendication 2, dans laquelle la zone de calcination est formée d'une chambre de combustion (6), dont le raccord (11) d'évacuation des gaz est relié au conduit (5) d'évacuation des gaz du four qui relie le four tubulaire rotatif (4) au cyclone inférieur (2) du réchauffeur, caractérisée en ce que le raccord de décharge de la matière de la chambre de combustion (6) est relié au conduit (5) d'évacuation des gaz du four et le conduit (18) de décharge de la matière du cyclone inférieur (2) du réchauffeur (1) est relié par le dispositif (21) de subdivision du flux de matière d'une part au four tubulaire rotatif (4) et d'autre part au conduit (7) d'air tertiaire.
  5. Installation selon la revendication 2, dans laquelle la zone de calcination est formée d'une partie du conduit (5) d'évacuation des gaz du four qui est équipée d'un dispositif auxiliaire de combustion (23) et qui relie le four tubulaire rotatif (4) au cyclone inférieur (2) du réchauffeur (1), le conduit (7) d'air tertiaire étant raccordé au conduit (5) d'évacuation des gaz du four dans la région de la zone de calcination, caractérisée en ce que le conduit (18) de décharge de la matière du cyclone inférieur (2) du réchauffeur (1) est relié par le dispositif (21) de subdivision du flux de matière d'une part au four tubulaire rotatif (4) et d'autre part au conduit (7) d'air tertiaire.
  6. Installation selon la revendication 3, caractérisée en ce que le conduit (7) d'air tertiaire se ramifie et il est relié par au moins deux embranchement (7a', 7a", 7b) à la chambre de combustion (6), le conduit (17) de décharge de la matière de l'avant dernier cyclone inférieur (3) du réchauffeur (1) étant relié à l'un des embranchements (7a") et la chambre de combustion (6) étant reliée par le dispositif de subdivision du flux de matière à l'autre embranchement (7b).
  7. Installation selon la revendication 2, dans laquelle la zone de calcination est formée d'une chambre de combustion (6), dont le raccord d'évacuation des gaz (11) est relié au conduit (5) d'évacuation des gaz du four qui relie le four tubulaire rotatif (4) au cyclone inférieur (2) du réchauffeur (1), caractérisée en ce que le raccord (11) d'évacuation des gaz, qui est prévu à la partie inférieure de la chambre de combustion (6), forme également un raccord de décharge de matière.
  8. Installation selon la revendication 7, caractérisée en ce qu'un autre raccord (12) de décharge de matière est prévu à la partie inférieure de la chambre de combustion (6) en plus du raccord de décharge de matière qui forme également le raccord (11) d'évacuation des gaz de la chambre de combustion (6).
  9. Installation selon la revendication 2, dans laquelle la zone de calcination est formée d'une chambre de combustion (6), dont le raccord (11') d'évacuation des gaz est relié au conduit (5) d'évacuation des gaz du four qui relie le four tubulaire rotatif (4) au cyclone inférieur (2) du réchauffeur (1), caractérisée en ce qu'un raccord indépendant (12') de décharge de matière équipé d'un dispositif (19) de subdivision du flux de matière est prévu sous le raccord (11') d'évacuation des gaz de la chambre de combustion (6).
  10. Installation selon la revendication 2, caractérisée en ce que le conduit (13) par lequel passe la matière recyclée est raccordé au conduit (7) d'air tertiaire en un emplacement qui est situé en aval - par rapport au sens de circulation de l'air tertiaire - d'un étranglement (14) prévu dans le conduit d'air tertiaire.
EP88121322A 1988-01-14 1988-12-20 Procédé et installation pour le traitement thermique de produits en poudre Expired - Lifetime EP0327717B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3800895A DE3800895A1 (de) 1988-01-14 1988-01-14 Verfahren und anlage zur waermebehandlung von feinkoernigem gut
DE3800895 1988-01-14

Publications (3)

Publication Number Publication Date
EP0327717A2 EP0327717A2 (fr) 1989-08-16
EP0327717A3 EP0327717A3 (en) 1990-05-30
EP0327717B1 true EP0327717B1 (fr) 1993-02-24

Family

ID=6345275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121322A Expired - Lifetime EP0327717B1 (fr) 1988-01-14 1988-12-20 Procédé et installation pour le traitement thermique de produits en poudre

Country Status (5)

Country Link
US (1) US4941821A (fr)
EP (1) EP0327717B1 (fr)
DE (2) DE3800895A1 (fr)
ES (1) ES2037809T3 (fr)
ZA (1) ZA889561B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992003691A1 (fr) * 1990-08-24 1992-03-05 Klöckner-Humboldt-Deutz Aktiengesellschaft Installation pour le traitement thermique de matieres brutes farineuses
EP0526770A2 (fr) * 1991-07-13 1993-02-10 Klöckner-Humboldt-Deutz Aktiengesellschaft Installation pour le traitement thermique de fines crues
DE4329021C2 (de) * 1993-05-07 2002-09-19 Helmut Dorst Verfahren zur Herstellung von Zementklinker

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132102A (en) * 1989-12-21 1992-07-21 Fuller Company Method for heat treatment of fines with atmosphere control
DE19854650A1 (de) * 1998-11-26 2000-05-31 Biermann Gunter Verfahren und Vorrichtung zum Färben von Vergußmassen
CZ305636B6 (cs) * 2002-09-13 2016-01-20 Psp Engineering A. S. Zařízení pro přepravu suroviny mezi nízkoteplotní a vysokoteplotní částí sníženého výměníku tepla

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2724654C2 (de) * 1977-06-01 1984-01-26 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und Einrichtung zum Brennen von feinkörnigem bis staubförmigem Gut, insbesondere von Zementrohmehl
DE2752323A1 (de) * 1977-11-23 1979-06-07 Polysius Ag Verfahren und anlage zur waermebehandlung von feinkoernigem gut
DE3000494A1 (de) * 1980-01-08 1981-07-09 Krupp Polysius Ag, 4720 Beckum Verfahren und anlage zur waermebehandlung von feinkoernigem gut
US4381916A (en) * 1981-09-11 1983-05-03 Fuller Company Method and apparatus for roasting fine grained ores
DD204695B1 (de) * 1981-10-13 1986-12-17 Dessau Zementanlagenbau Veb Vorrichtung zum kalzinieren von zementrohmehl
DE3212009A1 (de) * 1982-03-31 1983-10-06 Krupp Polysius Ag Verfahren und vorrichtung zur waermebehandlung von feinkoernigem gut
DE3522272A1 (de) * 1985-03-22 1986-09-25 Krupp Polysius Ag, 4720 Beckum Verfahren und anlage zur waermebehandlung von feinkoernigem gut
US4708644A (en) * 1986-07-08 1987-11-24 Fuller Company Apparatus for roasting fine grained material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992003691A1 (fr) * 1990-08-24 1992-03-05 Klöckner-Humboldt-Deutz Aktiengesellschaft Installation pour le traitement thermique de matieres brutes farineuses
EP0526770A2 (fr) * 1991-07-13 1993-02-10 Klöckner-Humboldt-Deutz Aktiengesellschaft Installation pour le traitement thermique de fines crues
EP0526770A3 (en) * 1991-07-13 1993-06-23 Kloeckner-Humboldt-Deutz Aktiengesellschaft Thermic treatment installation for raw fines
DE4329021C2 (de) * 1993-05-07 2002-09-19 Helmut Dorst Verfahren zur Herstellung von Zementklinker
DE4315212C5 (de) * 1993-05-07 2004-06-03 Dorst, Helmut, Dipl.-Ing. Verfahren zur Herstellung von Zementklinker

Also Published As

Publication number Publication date
ES2037809T3 (es) 1993-07-01
DE3878678D1 (de) 1993-04-01
EP0327717A3 (en) 1990-05-30
ZA889561B (en) 1989-09-27
EP0327717A2 (fr) 1989-08-16
DE3800895A1 (de) 1989-07-27
US4941821A (en) 1990-07-17

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