EP0182697B1 - 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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EP0182697B1
EP0182697B1 EP85402108A EP85402108A EP0182697B1 EP 0182697 B1 EP0182697 B1 EP 0182697B1 EP 85402108 A EP85402108 A EP 85402108A EP 85402108 A EP85402108 A EP 85402108A EP 0182697 B1 EP0182697 B1 EP 0182697B1
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EP
European Patent Office
Prior art keywords
powdery material
calcination
combustion
fuel
post
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English (en)
French (fr)
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EP0182697B2 (de
EP0182697A1 (de
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François Desmidt
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CLE
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CLE
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Priority claimed from FR8417213A external-priority patent/FR2573063B1/fr
Priority claimed from FR8515483A external-priority patent/FR2588853B2/fr
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Priority to AT85402108T priority Critical patent/ATE62739T1/de
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    • 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.
  • the recent methods and installations for manufacturing a hydraulic binder comprise a preliminary stage of pre-calcination of a pulverulent material suitable for the manufacture of a hydraulic binder, which can 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.
  • the precalcination is usually carried out as shown in FIG. 1 of the accompanying drawings by suspending the pulverulent material using various gases, in particular using gas from the calcination furnace, 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
  • 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.
  • GB-A-1 406 965 there is known an installation for the manufacture of cement clinker comprising in particular a preheating system, a pre-calciner with separation stage, and a calcination furnace.
  • this installation does not solve the technical problem consisting in providing 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 a clinker cement without requiring modifications of instruments pre-calcining or pre-existing calciners while leading preferably a heat balance improved from the heat balance of the pre processes and plants - known cédemment.
  • 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 which moreover preferably allows a reversible operation to allow, when desired, the use of excellent quality fuels 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 pulverulent material, containing, or mixed to, a fuel, comprising a pre-heating, first followed by a prior step of pre-calcination in a pre-calcination zone where said fuel undergoes primary combustion using a oxidizing gas and at the outlet of which there exists a certain amount of unburnt, and then from a calcination or cooking step in a calcination or cooking zone, characterized in that one carries out, between the precalcination step and the calcination or cooking step, a post-combustion step where said fuel remaining in the pulverulent material is burned in an after-combustion zone by suspending in an oxidizing gas, the pulverulent material exiting from a separation stage which separates the precalcined material from the gases and which feeds this material in said calcination or cooking 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 fuel 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.
  • the above-mentioned oxidizing gas consists at least in part of hot air coming from a zone for cooling the calcined or cooked material evacuated 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.
  • At least a portion of the aforementioned dusty gases is 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, during the post-combustion stage, the temperature conditions of the redox potential or of the chemical potential of an element other than oxygen are controlled to optimize the conditions for volatilization of the 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 pulverulent material containing, or mixed with, a fuel.
  • a thermal treatment installation which can be applied to the manufacture of a hydraulic binder, such as a cement clinker, of a pulverulent material containing, or mixed with, a fuel.
  • the invention also relates to a thermal treatment installation which can be applied to the manufacture of a hydraulic binder, such as a cement clinker, of a pulverulent material containing, or mixed with, a fuel comprising a pre-heating system.
  • a hydraulic binder such as a cement clinker
  • a precalciner performing primary combustion of said fuel, followed by a stage for separating the pulverulent material from the gases forming part of the preheating system and a calcination or cooking, characterized in that it comprises between said separation stage and the calcination or cooking oven a post-combustion device for the fuel remaining in said pulverulent material, which is located on a circuit for transferring the pulverulent material from the separation stage to the calcination furnace, and which comprises a turbulence chamber in which the pulverulent material is resuspended in the oxidizing gas supplied in an adjustable manner by at least one oxidizing gas supply pipe.
  • This invention also relates to an embodiment of a heat treatment installation which can be applied to the manufacture of a hydraulic binder, such as a cement clinker, of a pulverulent material containing, or mixed with, a fuel comprising a pre-treatment system.
  • a hydraulic binder such as a cement clinker
  • a precalciner performing primary combustion of said fuel, followed by a separation stage of the pulverized material rulente of gases forming part of the preheating system and a calcination or cooking oven, characterized in that it comprises between said separation stage and the calcination or cooking oven a device for post-combustion of the fuel remaining in said pulverulent material, which is located on a circuit for transferring the pulverulent material from the separation stage to the calcination furnace, and which comprises a fluidization chamber comprising a fluidization grid.
  • Another subject of this invention is a thermal treatment installation which can be applied to the manufacture of a hydraulic binder, such as a cement clinker, of a pulverulent material containing, or mixed with, a fuel comprising a pre- heating of at least the pulverulent material, followed by a precalciner performing primary combustion of said fuel, followed by a stage for separating the pulverulent material from the gases forming part of the preheating system and a calcination furnace or cooking, characterized in that it comprises between said separation stage and the calcination or cooking oven a post-combustion device for the fuel remaining in said pulverulent material, which is located on a circuit for transferring the pulverulent material from the separation stage towards the calcination furnace, and which forms with the transfer circuit a fluidized siphon ensuring the transfer of the pulp material crooked towards the oven.
  • a hydraulic binder such as a cement clinker
  • 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 more economical fuels contained in or mixed with the pulverulent material.
  • 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.
  • an installation according to this invention is characterized in that the aforementioned chamber comprises an ascending evacuation duct comprising a plunging part supplied with gas so that the pre-calcined material is transferred to the furnace by pneumatic ascent.
  • This installation is further characterized in that the aforementioned chamber comprises a lateral evacuation duct so that the pre-calcined material is fed to the furnace by simple overflow.
  • the invention relates to yet another embodiment of a heat treatment installation which can be applied to the manufacture of a hydraulic binder, such as a cement clinker, of a pulverulent material containing, or mixed with, a fuel comprising a system for preheating at least the pulverulent material, followed by a precalciner performing primary combustion of said fuel, followed by a stage for separating the pulverulent material from the gases forming part of the preheating system and an oven calcination or cooking, characterized in that it comprises between said separation stage and the calcination or cooking oven a post-combustion device for the fuel remaining in said pulverulent material, which is located on a circuit for transferring the pulverulent material from the separation stage towards the calcination furnace, and which is constituted by the lower part of a smoke box modified to have its wall forming the bottom at a level lower than that of the bottom of the oven, said wall forming the bottom of the smoke box being produced in the form of a fluidization grid.
  • the installation according to the invention is further characterized in that the outlet of the post-combustion device comprises at least one discharge pipe for at least a portion of the dusty gases loaded with harmful volatile compounds.
  • the outlet of the post-combustion device comprises at least one pipe for recycling part of the dusty gases in the aforementioned pre-calciner or in the aforementioned pre-heating system.
  • FIG. 1 there is shown an embodiment of 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 vintage 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 oven 101 or baking is a rotary oven which is provided with a smoke box 108 by which the gases from the calcination oven 101 or baking go up through a conduit 109 leading to the pre -calciner 103.
  • the mixture of the pulverulent material, the combustible component and the gases, in particular the combustion air, are evacuated from the precalciner 103 by a conduit 110 towards the pre-heating system, comprising a stage separation bottom 106 separating gases from solids.
  • 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 time of gas stay of about 1.4 seconds 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 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 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 duct 211 is designed so as to also be able to directly supply the oven 201, that is to say to be able to bypass the combustion device 212, which increases the flexibility of the installation and of 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 to any existing installation, this being the same for the process thus making it possible to use fuels of poorer reactivity.
  • a sheath 214 of a volume of 5 m 3 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 the upper part of the material has been brought pulverulent containing the unburnt fuel particles through the transfer line 311, while oxidant gas is supplied to the base of said chamber 330 through a line 320 having 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 the cyclone 324.
  • the separated material is introduced into the furnace via line 328 while the combustion gases are evacuated through a 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 duct for transferring the pulverulent material 411 the lower stage 406 of separation in 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 leading to 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 comprising 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 the conduit 452.
  • the conduit 462 terminates in 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 located at a level lower than that of the bottom 601 a of the oven. 601.
  • 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.
  • this 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 similar 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)

Claims (18)

1. An die Herstellung eines hydraulischen Bindemittels, wie eines Zementklinkers aus einem einen Brennstoff enthaltenden oder diesem beigemischten,pulverförmigen Material anwendbares Wärmebehandlungsverfahren, umfaßend eine Vorwärmung mit zuerst anschließendem vorherigem Schritt eines Vorbrennens in einem Vorbrennbereich (203; 303;403;503;603), wo der besagte Brennstoff eine Primärverbrennung insbesondere mit Hilfe eines die Verbrennung bewirkenden Gases erfährt und an dessen Ausgang ein gewisser Anteil an unverbrannten Rückständen besteht und dann einen Brenn- bzw. Glühvorgang in einem Brenn- bzw. Glühbereich (201;301;401;501;601), dadurch gekennzeichnet, daß man zwischen dem Vorbrennvorgang und dem Brenn- bzw. Glühvorgang einen Nachverbrennungsschritt durchführt, bei welchem der besagte in dem pulverförmigen Material zurückbleibende Brennstoff in einem Nachverbrennungsbereich
(212;312;412;512;612) durchführt durch ein Suspendieren, in einem die Verbrennung bewirkenden Gas, des aus der Scheidungsstufe (206;306;406;506;606) austretenden pulverförmigen Materials, welche das vorverbrannte Material von den Gasen trennt und welche dieses Material in dem besagten Brenn- bzw. Glühbereich einführt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Volumen des Nachverbrennungsbereichs in Abhängigkeit der in dem Nachverbrennungsbereich zur Durchführung des vollständigen Verbrennens des besagten Brennstoffs erforderlichen Aufenthaltzeit bestimmt wird und ungefähr ein Zehntel bis ein Fünfzigtel desjenigen des Vorbrennbereiches beträgt.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet,daß das vorgenannte die Verbrennung bewirkende Gas wenigstens zum Teil durch die aus einem Bereich zur Kühlung des aus dem Brenn- bzw. Glühbereich abgeführten verbrannten Materials kommende , heiße Luft gebildet wird.
4. Verfahren nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß man einen Schritt der Trennung des pulverförmigen Materials von dem Suspendierungsgas in einem Nebenscheidungsbereich durchführt.
5. Verfahren nach einem der Ansprüche 1 bis 4,dadurch gekennzeichnet, daß wenigstens ein Teil der aus dem Nachverbrennungsvorgang austretenden staubigen Gase behandelt und umgewälzt und/oder in die Luft ausgestoßen (226a; 326a; 466a;526a) wird, um die schädlichen flüchtigen Verbundstoffe daraus zu entfernen.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß wenigstens ein Teil der vorgenannten staubigen Gase zur Vorbrenn- bzw. Vorwärmestufe zurückgeführt wird.
7. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die aus der Nachverbrennungsstufe austretenden Gase in einem Absetzzyklon teilweise entstaubt werden und daß ein Bruchteil des somit zurückgewonnenen Staubes zur Brennstufe zurückgeführt wird.
8. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß während dem Nachverbrennungsvorgang, man die Temperaturverhältnisse des Oxydations-Reduktions-Potentials oder des chemischen Potentials eines anderen Elementes als Sauerstoff zwecks Optimisierung der Verflüchtigungsverhältnisse der schädlichen flüchtigen Stoffverbindungen kontrolliert.
9. An die Herstellung eines hydraulischen Bindemittels, wie eines Zementklinkers aus einem einen Brennstoff enthaltenden oder diesem beigemischten,pulverförmigen Material anwendbare Wärmebehandlungsanlage, umfa- ßend eine Einrichtung zur Vorwärmung wenigstens des pulverförmigen Materials mit einer anschließenden, die Primärverbrennung des besagten Brennstoffs veranlaßenden, Vorbrenneinrichtung (203), mit einer nachfolgenden, einen Teil der Vorwärmeeinrichtung bildenden Stufe (206) zur Trennung des pulverförmigen Materials von den Gasen und einen Brenn- bzw. Glühofen (201) , dadurch gekennzeichnet, daß sie zwischen der besagten Trennstufe (206) und dem Brenn- bzw. Glühofen (201) eine Vorrichtung (212) zum Nachverbrennen des in dem besagten pulverförmigen Materials zurückbleibenden Brennstoffs, welche sich in einem Kreislauf (211) zur Überführung des pulverförmigen Materials von der Trennstufe (206) zum Brennofen (201) hin befindet aufweist, und welche Vorrichtung einen, mit die Verbrennung bewirkenden Gas in einstellbarer Weise über wenigstens eine Leitung (218,220) zur Zufuhr des besagten die Verbrennung bewirkenden Gases gespeisten, Kanal (214) zum Wiedersuspendieren aufweist, welches die Verbrennung bewirkende Gas Heißluft aus der Einrichtung zur Kühlung des aus dem Ofen (201) abgeführten, gebrannten bzw. geglühten Materials ist, gemäß einem, das Suspendieren des pulverförmigen Materials in dem besagten Gas gewährleistenden Durchsatz.
10. An die Herstellung eines hydraulischen Bindemittels, wie eines Zementklinkers aus einem, einen Brennstoff enthaltenden oder diesem beigemischten pulverförmigen Material anwendbare Wärmebehandlungsanlage, umfa- ßend eine Einrichtung zur Vorwärmung wenigstens des pulverförmigen Materials, mit einem anschließenden, eine Primärverbrennung des besagten Brennstoffs veranlaßenden Vorverbrenner (303), mit einer nachfolgenden, einen Teil der Vorwärmeeinrichtung bildenden Stufe (306) zur Trennung des pulverförmigen Materials von den Gasen und einen Brenn- bzw. Glühofen (301), dadurch gekennzeichnet, daß sie zwischen der besagten Trennstufe (306) und dem Brenn- bzw. Glühofen (301) eine Vorrichtung (312) zum Nachverbrennen des in dem besagten pulverförmigen Material zurückbleibenden Brennstoffs aufweist, welche sich in einem Kreislauf (311) zur Überführung des pulverförmigen Materials von der Trennstufe (306) zum Brennofen (301) hin befindet und welche eine Wirbelungskammer (312) umfaßt, in welcher das pulverförmige Material wieder in dem, in einstellbarer Weise durch wenigstens eine Leitung (316;320) zur Zufuhr des die Verbrennung bewirkenden Gases zugeführten, die Verbrennung bewirkenden Gas suspendiert wird.
11. An die Herstellung eines hydraulischen Bindemittels, wie eines Zementklinkers aus einem einen Brennstoff enthaltenden oder diesem beigemischten pulverförmigen Material anwendbare Wärmebehandlungsanlage, umfa- ßend eine Einrichtung zur Vorwärmung wenigstens des pulverförmigen Materials, mit einem anschließenden, eine Primärverbrennung des besagten Brennstoffs veranlaßenden, Vorverbrenner (403;503;603), mit einer nachfolgenden, einen Teil der Vorwärmeeinrichtung bildenden Stufe (406;506;606) zur Trennung des pulverförmigen Materials von den Gasen und einen Brenn- bzw. Glühofen (401; 501; 601), dadurch gekennzeichnet, daß sie zwischen der besagten Trennstufe (406;506;606) und dem Brenn- bzw. Glühofen (401;501;601) eine Vorrichtung (412;512;612) zum Nachverbrennen des in dem besagten pulverförmigen Material zurückbleibenden Brennstoffs aufweist, welche sich in einem Kreislauf (411;511;611) zur Überführung des pulverförmigen Materials von der Trennstufe (406; 506;606) zum Brennofen (401;501;601) hin befindet und welche eine Fluidisierungskammer (452;552;652) mit einem Fluidisierungsrost (454;554;654) umfaßt.
12. An die Herstellung eines hydraulischen Bindemittels, wie eines Zementklinkers, aus einem einen Brennstoff enthaltenden oder diesem beigemischten,pulverförmigen Material anwendbare Wärmebehandlungsanlage, umfa- ßend eine Einrichtung zur Vorwärmung wenigstens des pulverförmigen Materials, mit einem anschließenden, eine Primärverbrennung des besagten Brennstoffs veranlaßenden, Vorverbrenner (403;503), mit einer nachfolgenden, einen Teil der Vorwärmeeinrichtung bildenden, Stufe (406;506) zur Trennung des pulverförmigen Materials von den Gasen und einen Brenn- bzw. Glühofen (401;501 dadurch gekennzeichnet, daß sie zwischen der besagten Trennstufe (406;506) und dem Brenn- bzw. Glühofen (401;501) eine Vorrichtung (412;512) zum Nachverbrennen des in dem besagten pulverförmigen Material zurückbleibenden Brennstoffs aufweist, welche sich in einem Kreislauf (411;511) zur Überführung des pulverförmigen Materials von der Trennstufe (406;506) zu dem Brennofen (401;501) hin befindet und welche zusammen mit dem Überführungskreislauf (411;511) einen, die Überführung des pulverförmigen Materials zum Ofen (401;501) hin bewirkenden fluidisierten Siphon bildet.
13. Anlage nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die vorgenannte Kammer (452) eine aufsteigende Abfuhrleitung (462) mit einem tauchenden, mit Gas versorgten Teil (464), derart, daß das vorgebrannte Material durch pneumatischen Aufstieg zum Ofen (401) hin überführt wird.
14. Anlage nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die vorgenannte Kammer (552) eine seitliche Abfuhrleitung (511) aufweist, sodaß das vorgebrannte Material durch einfaches Überlaufen dem Ofen (501) zugeführt wird.
15. An die Herstellung eines hydraulischen Bindemittels, wie eines Zementklinkers, aus einem einen Brennstoff enthaltenden oder diesem beigemischten, pulverförmigen Material anwendbare Wärmebehandlungsanlage, umfa- ßend eine Einrichtung zur Vorwärmung wenigstens des pulverförmigen Materials, mit einem anschließenden, eine Primärverbrennung des besagten Brennstoffs veranlaßenden Vorverbrenner (603), mit einer nachfolgenden, einen Teil der Vorwärmeeinrichtung bildenden, Stufe (606) zur Trennung des pulverförmigen Materials von den Gasen und einen Brenn- bzw. Glühofen (601), dadurch gekennzeichnet, daß sie zwischen der besagten Trennstufe (606) und dem Brenn- bzw. Glühofen (601) eine Vorrichtung (612) zum Nachverbrennen des in dem besagten pulverförmigen Materials zurückbleibenden Brennstoffs, welche sich in einem Kreislauf (611) zur Überführung des pulverförmigen Materials von der Trennstufe (606) zum Brennofen (601) hin befindet und welche durch den unteren Teil (670) einer Rauchkammer (608) gebildet wird, die abgeändert worden ist, damit ihre, einen Boden bildende, Wandung (672) in einer niedrigeren Höhe als diejenige des Bodens (601 a) des Ofens (601) liegt, wobei die besagte, einen Boden bildende, Wandung (672) der Rauchkammer (608) als Fluidisierungsrost (654) ausgebildet ist.
16. Anlage nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß der Ausgang der Nachverbrennungsvorrichtung
(212;312;412;512) wenigstens eine Leitung (226a;326a;466a;526a) zum Abführen wenigstens eines Teiles der mit schädlichen flüchtigen Stoffverbindungen aufgeladenen staubigen Gase aufweist.
17. Anlage nach einem der Ansprüche 9 bis 16, dadurch gekennzeichnet, daß der Ausgang der Nachverbrennungsvorrichtung wenigstens eine Leitung (226b,326b,466b, 526b) zur Rückführung eines Teils der staubigen Gase in den vorgenannten Vorbrenner oder in die vorgenannte Vorwärmeeinrichtung aufweist.
18. Anwendung des Verfahrens nach einem der Ansprüche 1 bis 8 und der Anlage nach einem der Ansprüche 9 bis 17 an die Herstellung eines hydraulischen Bindemittels wie eines Zementklinkers.
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)

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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.

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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

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

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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

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GB1406965A (en) * 1973-11-08 1975-09-17 Ishikawajima Harima Heavy Ind Suspension-type preheating system for powdery raw materials
JPS532646B2 (de) * 1974-09-30 1978-01-30
DK333075A (da) * 1974-07-31 1976-02-01 Mitsubishi Heavy Ind Ltd Fremgangsmade og apparat til kalcinering af cementmaterialer
JPS5187528A (ja) * 1975-01-31 1976-07-31 Onoda Cement Co Ltd Kashosochitsukisementoshoseisochino furyoseigyosochi
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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
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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

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DE182697T1 (de) 1986-11-06
DK518985A (da) 1986-05-13
DK518985D0 (da) 1985-11-11
JPS61174149A (ja) 1986-08-05
JPH0742145B2 (ja) 1995-05-10
DK163230C (da) 1992-07-06
EP0182697B2 (de) 1994-11-02
DK163230B (da) 1992-02-10
DE3582564D1 (de) 1991-05-23
US4664625A (en) 1987-05-12
EP0182697A1 (de) 1986-05-28

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