EP0182697A1 - Verfahren und Vorrichtung zur thermischen Behandlung, verwendbar bei der Herstellung eines hydraulischen Bindemittels, enhaltend eine Nachverbrennungsstufe - Google Patents

Verfahren und Vorrichtung zur thermischen Behandlung, verwendbar bei der Herstellung eines hydraulischen Bindemittels, enhaltend eine Nachverbrennungsstufe Download PDF

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Publication number
EP0182697A1
EP0182697A1 EP19850402108 EP85402108A EP0182697A1 EP 0182697 A1 EP0182697 A1 EP 0182697A1 EP 19850402108 EP19850402108 EP 19850402108 EP 85402108 A EP85402108 A EP 85402108A EP 0182697 A1 EP0182697 A1 EP 0182697A1
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EP
European Patent Office
Prior art keywords
post
combustion
calcination
pulverulent material
zone
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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
EP19850402108
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English (en)
French (fr)
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EP0182697B2 (de
EP0182697B1 (de
Inventor
François Desmidt
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CLE
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CLE
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26224236&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0182697(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from FR8417213A external-priority patent/FR2573063B1/fr
Priority claimed from FR8515483A external-priority patent/FR2588853B2/fr
Application filed by CLE filed Critical CLE
Priority to AT85402108T priority Critical patent/ATE62739T1/de
Publication of EP0182697A1 publication Critical patent/EP0182697A1/de
Application granted granted Critical
Publication of EP0182697B1 publication Critical patent/EP0182697B1/de
Publication of EP0182697B2 publication Critical patent/EP0182697B2/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/2016—Arrangements of preheating devices for the charge
    • F27B7/2025—Arrangements of preheating devices for the charge consisting of a single string of cyclones
    • F27B7/2033—Arrangements of preheating devices for the charge consisting of a single string of cyclones with means for precalcining the raw material

Definitions

  • the present invention essentially relates to a method and an installation for heat treatment which can be applied to the manufacture of a hydraulic binder, comprising a post-combustion step.
  • a hydraulic binder for example, comprise a preliminary stage of pre-calcination of a pulverulent material suitable for the manufacture of a hydraulic binder, which may be a cement clinker. , in a pre-calciner and a calcination or baking step proper in a calcination or baking oven, which can be a clinkering oven.
  • Pre-calcination is usually carried out as shown in Figure 1 of the accompanying drawings by suspending the pulverulent material using various gases, in particular using gas from the calcination oven, as well as advantageously the hot air recovered from the cooler.
  • This pulverulent material may contain a component capable of causing an exothermic reaction either with a gas or with another component.
  • a component capable of causing an exothermic reaction usually called fuel
  • the basic pulverulent material does not contain not such a component likely to cause an exothermic reaction, usually called fuel, it must therefore be mixed with such a combustible component.
  • the preliminary pre-calcination step constitutes a primordial step of preparation of the raw material before carrying out the heat treatment for preparing the hydraulic binder in the calcination or cooking zone.
  • this prior combustion is much more difficult to achieve when the starting fuel is of lower quality, and therefore more economical.
  • Such starting fuels are for example the poorest coals, charcoals, petroleum cokes, etc.
  • the residence time of the gases in the precalciner represents an image of the residence time of the material and of the fuel.
  • the volume of the precalciner is 160 m 3 and the doubling of such a plant is practically impractical from a technological point of view.
  • the present inventor posed the new technical problem consisting in the supply of a new process and a new installation which would allow the use of more economical fuels, for example for the preparation of a hydraulic binder, in particular of a cement clinker, without however requiring modifications to existing pre-calcination devices or pre-calciners while preferably resulting in an improved thermal balance compared to the thermal balance of previously known processes and installations.
  • the present invention also aims to provide a solution making it possible to modify only very slightly the heat treatment methods and installations, for example those relating to the manufacture of hydraulic binders, previously known and preferably also allowing reversible operation to allow, when desired, the use of excellent qualities in the same installation.
  • the solution provided by the present invention must also allow the simultaneous use of fuels with very different reactivities.
  • the present invention provides a heat treatment process, which can be applied to the manufacture of a hydraulic binder, such as a cement clinker, of a suitable pulverulent material, preferably containing , or mixed with, a component capable of causing an exothermic reaction either with a gas or with another component, preferably comprising a pre-heating, followed by a prior step of pre-calcination in a pre-calcination zone where said component undergoes primary combustion in particular using an oxidizing gas, and a calcination or cooking step proper in a heat treatment zone called calcination or cooking, characterized, in particular with a view to reducing the rate of unburnt, in that one carries out, between the pre-calcination step and the calcination or cooking step, a post-combustion step of said component remaining in said pulverulent material in a post-combustion zone.
  • the volume of the post-combustion zone is predetermined as a function of the residence time required in the post-combustion zone to carry out complete combustion of said component and is from 1-10th to 1-50th approximately that of the pre-calcination zone.
  • the post-combustion zone is located on the transfer circuit of the pulverulent material from a separation stage forming part of the pre-combustion stage. heating which separates the pre-calcined material from the gases and feeds it into the calcination zone.
  • post-combustion is caused by suspending the pulverulent material in an oxidizing gas advantageously preheated, preferably consisting of less in part by the hot air coming from a zone for cooling the calcined or cooked material discharged from the calcination zone.
  • a step of separating the pulverulent material from the suspending gas is carried out in an annexed separation zone.
  • This process is further characterized in that at least a portion of the dusty gases from the post-combustion stage is treated and recycled and / or released to the atmosphere to remove harmful volatile compounds therefrom.
  • another part of the aforementioned dusty gases can be recycled to the pre-calcination or pre-heating stage.
  • the gases from the post-combustion stage are partially dedusted in a cyclone separator and a fraction of the dust thus recovered is recycled to the calcination stage.
  • This process is further characterized in that, when the post-combustion stage, the temperature conditions of redox potential or chemical potential of an element other than oxygen are controlled to optimize the conditions for volatilization of harmful volatile compounds.
  • the present invention also provides a thermal treatment installation, which can be applied to the manufacture of a hydraulic binder, such as a cement clinker, of a suitable pulverulent material, preferably containing, or mixed with, a component capable of causing an exothermic reaction either with a gas or with another component, preferably comprising a system for preheating at least the pulverulent material, followed by a precalciner performing primary combustion of said component, followed by a stage for separating the pulverulent material from the gases, forming part of the preheating system, and a heat treatment oven called calcination or cooking, characterized in that it comprises, between the pre-calciner, preferably between said separation stage, and the calcination or baking oven, a post-combustion device for said component remaining in said pulverulent material.
  • a thermal treatment installation which can be applied to the manufacture of a hydraulic binder, such as a cement clinker, of a suitable pulverulent material, preferably containing, or mixed with, a component
  • the volume of the post-combustion device is adapted to the residence time necessary to carry out the post-combustion, this volume being between approximately 1-10th and approximately 1-50th of the volume of the pre - calciner.
  • the post-combustion device is located on the transfer circuit of the pulverulent material from the separation stage to the calcination or baking oven.
  • the post-combustion device comprises a return sheath suspension fed adjustably oxidizing gas via at least one duct oxidizer feed gas, said gas preferably being of an hot air from the cooling system of the calcined material discharged from the furnace or cooked, at a rate producing suspending the pulverulent material in said gas.
  • the post-combustion device comprises a fluidization chamber comprising a fluidization grid.
  • the post-combustion device is produced in the form of a fluidized siphon ensuring the transfer of the pulverulent material to the furnace.
  • the residence time in the treatment system of the pulverulent material can be modulated at will before the calcination or actual cooking so as to adapt the residence time as a function of the specificity of the pulverulent material or of the component causing an exothermic reaction or combustible component.
  • the residence time in the post-combustion zone can be modulated so as to reduce the rate of unburnt products originating from the pre-calcination zone by a limited quantity of gas.
  • oxidizer generally air.
  • the method and the installation according to the invention make it possible to use fuels contained in or mixed with powdery material, more economical. These can be, for example, the poorest coals, charcoals, petroleum coke, the combustion of which cannot be complete in the pre-calcination zone in which the residence time is limited.
  • the installation according to this invention is characterized in that the outlet of the post-combustion device comprises at least one discharge pipe for at least part of the dusty gases loaded with harmful volatile compounds.
  • outlet of the post-combustion device comprises at least one other pipe for recycling another part of the dusty gases in the aforementioned pre-calciner or in the aforementioned pre-heating system.
  • a conventional installation for manufacturing a hydraulic binder in particular consisting of a cement clinker, from an appropriate pulverulent material, preferably containing, or mixed with, a component capable of causing an exothermic reaction either with a gas or with another component.
  • the pulverulent material is a conventional raw material usually called flour from a grinding workshop, preheated beforehand and then introduced via a conduit 104 into the precalciner 103.
  • This pulverulent material can be mixed beforehand with the constituent capable of cause an exothermic reaction or combustible component, or in some cases, the combustible component can be introduced separately into the precalciner 103.
  • this gas is preferably hot air recovered from the clinker cooler, which is located downstream from the calcination or baking oven 101.
  • the calcination or baking oven 101 is a rotary oven which is provided with a smoke box 108 through which the gases from the calcination furnace 101 or from the baking oven go up 109 leading to the precalciner 103.
  • the mixture of the pulverulent material, the combustible component and the gases, in particular air from combustion, are evacuated from the precalciner 103 by a conduit 110 to the preheating system, comprising a lower separation stage 106 separating the gases from the solid materials.
  • the gases pass through a conduit 105 to an upper stage of the preheating system while the solid materials are transferred by gravity through a transfer conduit 111 to the calcination or baking oven 101 via the smoke box 108
  • the volume of the precalciner 103 and the connecting conduits 109, 110 is approximately 160 m 3, this volume corresponds to a residence time. about 1.4 seconds of gas in the precalciner. It is thus understood that when using a lower quality fuel component, that is to say a lower reactivity, it will be necessary to increase this residence time.
  • the same reference numbers have been used for the same elements as those of the conventional installation of FIG. 1, increased by 100.
  • the precalciner is marked 203, etc.
  • the installation is characterized in that it comprises an post-combustion device designated by the general reference number 212, preferably arranged here between the lower stage 206 for separating the pre-heating system, and the calcination or baking oven 201, performing a post-combustion of the pulverulent material which contains a variable rate of unburnt.
  • an post-combustion device designated by the general reference number 212, preferably arranged here between the lower stage 206 for separating the pre-heating system, and the calcination or baking oven 201, performing a post-combustion of the pulverulent material which contains a variable rate of unburnt.
  • the volume of this post-combustion device 212 is adapted as a function of the unburnt rate which is transferred to it, that is to say therefore as a function of the reactivity in particular of the combustible component introduced into the pre-calciner 203.
  • the volume of this post-combustion device 212 is between approximately 1-10th and approximately 1-50th of the volume of the precalciner 203 (with the connecting conduits 209 and 210).
  • this post-combustion device 212 receives via the conduit 211 the pulverulent material coming from the lower separation stage 206 of the pre-heating system.
  • This conduit 211 is designed so that it can also directly supply the furnace 201, that is to say bypass the combustion device 212, which increases the flexibility of the installation and the method according to the invention.
  • the post-combustion device preferably comprises a sheath 214 for resuspension which is advantageously arranged substantially vertically.
  • This resuspension sheath may comprise towards its base a cusp of conduit 216 comprising a conduit 218 for supplying oxidizing gas, which is preferably constituted by hot air coming from the cooling system of the calcined or cooked material discharged from the oven 201, via the conduit 202.
  • the conduit 218 therefore constitutes a bypass of the conduit 202 as is clearly understandable in FIG. 2.
  • This conduit 218 is laterally provided with a valve 219 making it possible to adjust the flow rate of the oxidizing gas.
  • the base of the sheath 214 continues beyond the cusp 216 by a conduit 220 comprising a valve 222 allowing the supply of an oxidizing gas, such as air, cold or hot.
  • an oxidizing gas such as air, cold or hot.
  • the upper part of the resuspension sheath 214 leads to a separation stage 224, such as a cyclone, in which the pulverulent material is separated from the combustion gas or from the gas. vector, the combustion gases or vector leaving the separation stage 224 by a conduit 226, while the pulverulent, pre-calcined material no longer containing unburnt fuel is transferred by a transfer conduit 228 to the furnace 201 by the intermediate of the smoke box 208.
  • a separation stage 224 such as a cyclone
  • the post-combustion device according to the invention can be added very easily on any existing installation, this being the same for the process thus making it possible to use fuels of less good reactivity.
  • a sheath 214 of a volume of 5 m3 having for example a diameter of 0.5 m and a height of 20 m.
  • a coal with a calorific value of 5,000 kilo-calories / kilogram one can burn in the cladding 214 1,600 kilograms of coal per hour (20% of the total quantity supplied to the precalciner by line 204).
  • the sheath 214 can be supplied with 11,000 Nm 3 / hours of air.
  • the flow rate of material transported in the sheath 214 will be approximately 100 tonnes per hour.
  • Cyclone 224 associated with sheath 214 will have a diameter of about 1.50 m.
  • the pressure loss in the sheath 214 plus cyclone 224 assembly will be 5,000-5,500 Pascal.
  • the same increase in combustion time is obtained in the post-combustion device 212 with a sheath with a volume of the order of 3% of that of the precalciner, which is preferably associated with a small cyclone.
  • an important advantage lies in the fact that the most difficult to burn part of the fuel and which is already preheated is again in contact with clean air.
  • the pre-calciner has the number 303 and the post-combustion device the number 312.
  • the post-combustion device 312 comprises a turbulence chamber 330 in which was brought to the upper part of the pulverulent material containing the unburnt fuel particles by the transfer line 311, while oxidant gas is supplied to the base of said chamber 330 by a conduit 320 comprising a cusp 316 identical to that of the embodiment of FIG. 2.
  • this turbulence chamber 330 makes it possible to increase the contact time between the oxygen of the combustion air admitted via the pipes 318 and / or 320 and the particles of the unburnt fuel more significantly than in the case of 'A simple sheath 214 for resuspension as is the case of the embodiment of Figure 2.
  • the calcined material is separated from the combustion gases by cyclone 324. It will be noted here that the transfer of the mixture of the calcined material and of the gas takes place by a lateral pipe 332 comprising a substantially vertical ascending part 333 leading towards the summit. of the separation stage formed by cyclone 324.
  • the separated material is introduced into the furnace via line 328 while the combustion gases are evacuated via line 326.
  • FIG. 4 there is shown yet another embodiment of an installation according to the invention. Also, the parts common to those of FIG. 3 have the same reference numbers increased by 100. Thus, the post-combustion device here bears the same general reference number 412.
  • the pulverulent material transfer duct 411 from the lower stage 406 of separation to the oven 401 via the smoke box 408 remains present.
  • the post-combustion device 412 is arranged in bypass and is supplied with pulverulent material from the lower separation stage 406 by a lowering leg 450 in the post-combustion device 412 comprising a chamber 452 in which a fluidized bed is formed.
  • This chamber 452 comprises a fluidization grid 454 divided into two compartments by the presence of a vertical wall 456, each compartment being supplied by a separate supply 457, 458 ending in a common pipe 459 comprising a fan or a booster 460.
  • the air can be supplied by the conduit 418 or be constituted by cold or hot pure air supplied by the conduit 446.
  • the second compartment defined by the partition wall 456 is of reduced volume while the discharge of the pulverulent material is ensured by a pipe 462 having at its lower part an opening 464 opening out in the vicinity of the grid 454 so that the air supplied by means of a nozzle 455 is used for expulsion of the pulverulent material in duct 452.
  • the conduit 462 leads to the old transfer conduit 411.
  • the chamber 452 has at its upper part a degassing pipe 466 leading via the pipe 466b to the smoke box of the oven 401.
  • the air flows blown into the conduits 457, 458 can be very different so as to create two-beds of very different density and therefore also of very different height.
  • the post-combustion device 512 also includes a chamber 552 provided with a grate fluidization 554 supplied with air by the same installation as that described in Figure 4, however without the presence of a partition.
  • the pulverulent material is fed into the chamber 552 by a leg 550 for lowering the pulverulent material while the pulverulent material is removed from the post-combustion chamber 552 by simple overflow of the fluidized bed by leading the transfer conduit 511 laterally to the upper part of the fluidized bed.
  • a gas discharge pipe 526 is also provided, similar to the pipe 226 in FIG. 2.
  • the combustion gases leaving the separation stage 224, 324 (FIGS. 2 and 3) or else leaving directly from the post-combustion device 412, 512 (FIGS. 4 and 5 ), are evacuated by a conduit marked at 226, 326, 466, 526.
  • the aforementioned conduit can be divided into several branches forming for example two conduits 226a, 226b (FIG. 2), 326a, 326b ( Figure 3), 466a, 466b ( Figure 4), and 526a, 526b ( Figure 5).
  • One 226a, 326a, 466a, 526a, of the two conduits is used for the evacuation of part or all of the dusty gases loaded with harmful volatile compounds.
  • the gases passing through these conduits can be discharged directly into the atmosphere or else treated in any suitable manner to remove harmful volatile compounds therefrom before leaving to the atmosphere or possible recycling.
  • the other conduit 226b, 326b, 466b, 526b allows the recycling of another part of the dusty gases to the pre-calciner 203, 303, 403, 503, or to the pre-heating system (not shown).
  • the post-combustion device 612 is formed by the lower part 670 of the smoke box 608 which has been modified to have its bottom wall 672 situated at a level lower than that of the bottom 601a of the oven 601 Furthermore, the bottom wall 672 of the smoke box 608 is produced in the form of a fluidization grid 654 supplied with air by a supply duct 674 on which a fan or booster 675 is disposed. Fan or booster 675 is supplied either with air coming from line 618 analogous to line 218 of FIG. 2 or by pure fresh or preheated air coming from line 646 analogous to line 546 of FIG. 5.
  • the duct 611 for transferring the pulverulent material from the lower stage 606 for separating the preheating system is not modified and leads to the smoke box 608.
  • the pulverulent material is transferred into the oven 601 by simple overflow of the fluidized bed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP85402108A 1984-11-12 1985-10-31 Verfahren und Vorrichtung zur thermischen Behandlung, verwendbar bei der Herstellung eines hydraulischen Bindemittels, enhaltend eine Nachverbrennungsstufe Expired - Lifetime EP0182697B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85402108T ATE62739T1 (de) 1984-11-12 1985-10-31 Verfahren und vorrichtung zur thermischen behandlung, verwendbar bei der herstellung eines hydraulischen bindemittels, enhaltend eine nachverbrennungsstufe.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8417213 1984-11-12
FR8417213A FR2573063B1 (fr) 1984-11-12 1984-11-12 Procede et installation de traitement thermique, pouvant etre applique a la fabrication d'un liant hydraulique, comprenant une etape de post-combustion
FR8515483A FR2588853B2 (fr) 1985-10-18 1985-10-18 Procede et installation de traitement thermique, pouvant etre applique a la fabrication d'un liant hydraulique, comprenant une etape de post-combustion
FR8515483 1985-10-18

Publications (3)

Publication Number Publication Date
EP0182697A1 true EP0182697A1 (de) 1986-05-28
EP0182697B1 EP0182697B1 (de) 1991-04-17
EP0182697B2 EP0182697B2 (de) 1994-11-02

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ID=26224236

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EP85402108A Expired - Lifetime EP0182697B2 (de) 1984-11-12 1985-10-31 Verfahren und Vorrichtung zur thermischen Behandlung, verwendbar bei der Herstellung eines hydraulischen Bindemittels, enhaltend eine Nachverbrennungsstufe

Country Status (5)

Country Link
US (1) US4664625A (de)
EP (1) EP0182697B2 (de)
JP (1) JPH0742145B2 (de)
DE (2) DE182697T1 (de)
DK (1) DK163230C (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0776671B2 (ja) * 1990-06-26 1995-08-16 丸尾カルシウム株式会社 粉粒状原料の予熱装置
US5122190A (en) * 1990-07-13 1992-06-16 Southdown, Inc. Method for producing a hydraulic binder
JPH08111472A (ja) * 1994-10-07 1996-04-30 Nec Corp ピングリッドアレイ型パッケージ
JPH09129776A (ja) * 1995-10-31 1997-05-16 Nec Corp 集積回路パッケージ
DE102008053135B3 (de) 2008-10-24 2010-07-01 Polysius Ag Verfahren und Anlage zur Herstellung von Zementklinker
DE102022116337B4 (de) * 2022-06-30 2024-01-18 Ali Memari Fard Verfahren zur Herstellung eines gesinterten Materials zumindest aus einem alumiumhaltigen Rohstoff, vorzugsweise Nephelin, welcher als Rohmehl vorliegt

Citations (4)

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Publication number Priority date Publication date Assignee Title
GB1406965A (en) * 1973-11-08 1975-09-17 Ishikawajima Harima Heavy Ind Suspension-type preheating system for powdery raw materials
FR2280601A1 (fr) * 1974-07-31 1976-02-27 Mitsubishi Heavy Ind Ltd Procede et appareil pour la calcination de matieres pulverulentes pour ciment
FR2384727A1 (fr) * 1977-03-21 1978-10-20 Kloeckner Humboldt Deutz Ag Procede et installation de fabrication de clinker par cuisson en plusieurs etages
GB2028475A (en) * 1978-08-02 1980-03-05 Kloeckner Humboldt Deutz Ag Heat-treatment of fine material

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JPS532646B2 (de) * 1974-09-30 1978-01-30
JPS5187528A (ja) * 1975-01-31 1976-07-31 Onoda Cement Co Ltd Kashosochitsukisementoshoseisochino furyoseigyosochi
DE2602889A1 (de) * 1976-01-27 1977-07-28 Polysius Ag Vorrichtung zur waermebehandlung von feingut
JPS5388658A (en) * 1976-11-29 1978-08-04 Mitsubishi Heavy Ind Ltd Fluidized bed calcining apparatus equipped with preheating means
DE2801161B2 (de) * 1978-01-12 1981-06-25 Babcock Krauss-Maffei Industrieanlagen GmbH, 8000 München Verfahren und Brennen von Sintergut aus karbonatischen Rohstoffen wie z.B. Zementklinker
DE2931214C2 (de) * 1979-08-01 1986-06-12 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und Vorrichtung zur Trocknung und Feinmahlung von Kohle
DE2933289C2 (de) * 1979-08-17 1985-10-03 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zum Brennen von Klinker aus Zementrohstoffen
FR2505813A1 (fr) * 1981-05-15 1982-11-19 Fives Cail Babcock Perfectionnements aux procedes et installations pour la fabrication du clinker de ciment par voie seche
US4372784A (en) * 1981-08-21 1983-02-08 Allis-Chalmers Corporation Method for heat treating pulverous raw material calcining combustor therefor
US4381916A (en) * 1981-09-11 1983-05-03 Fuller Company Method and apparatus for roasting fine grained ores
JPS5899150A (ja) * 1981-12-04 1983-06-13 三菱鉱業セメント株式会社 粉状物質の仮焼装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1406965A (en) * 1973-11-08 1975-09-17 Ishikawajima Harima Heavy Ind Suspension-type preheating system for powdery raw materials
FR2280601A1 (fr) * 1974-07-31 1976-02-27 Mitsubishi Heavy Ind Ltd Procede et appareil pour la calcination de matieres pulverulentes pour ciment
FR2384727A1 (fr) * 1977-03-21 1978-10-20 Kloeckner Humboldt Deutz Ag Procede et installation de fabrication de clinker par cuisson en plusieurs etages
GB2028475A (en) * 1978-08-02 1980-03-05 Kloeckner Humboldt Deutz Ag Heat-treatment of fine material

Also Published As

Publication number Publication date
DK163230C (da) 1992-07-06
DE3582564D1 (de) 1991-05-23
DK163230B (da) 1992-02-10
JPH0742145B2 (ja) 1995-05-10
DK518985D0 (da) 1985-11-11
JPS61174149A (ja) 1986-08-05
EP0182697B2 (de) 1994-11-02
DE182697T1 (de) 1986-11-06
DK518985A (da) 1986-05-13
EP0182697B1 (de) 1991-04-17
US4664625A (en) 1987-05-12

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