EP3044181A1 - Installation et procédé de précalcination - Google Patents

Installation et procédé de précalcination

Info

Publication number
EP3044181A1
EP3044181A1 EP14771809.2A EP14771809A EP3044181A1 EP 3044181 A1 EP3044181 A1 EP 3044181A1 EP 14771809 A EP14771809 A EP 14771809A EP 3044181 A1 EP3044181 A1 EP 3044181A1
Authority
EP
European Patent Office
Prior art keywords
chamber
enclosure
waste
installation
calcination
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.)
Withdrawn
Application number
EP14771809.2A
Other languages
German (de)
English (en)
Inventor
Colin Paxton
Bruno DE ROBERT
Norbert ROUSSET
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.)
Lafarge SA
Original Assignee
Lafarge SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lafarge SA filed Critical Lafarge SA
Publication of EP3044181A1 publication Critical patent/EP3044181A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting
    • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
    • C04B7/4423—Waste or refuse used as fuel
    • 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 peculiar to rotary-drum furnaces
    • 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 peculiar to rotary-drum furnaces
    • F27B7/32—Arrangement of devices for charging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y02P40/125—Fuels from renewable energy sources, e.g. waste or biomass

Definitions

  • the present application relates to an installation for pre-calcination of mineral materials intended to feed a cement kiln and using alternative fuels, in particular waste materials.
  • the present patent application also relates to a process of pre-calcination of such mineral materials.
  • Cement is a hydraulic binder obtained by grinding and burning a mix of limestone and materials providing silicon, alumina and iron, for example clay to the burning process in order to produce clinker, said clinker is then ground with added calcium sulphate in the form of gypsum (calcium sulphate dihydrate, CaS04.2H20), hemi- hydrate (CaS04.1/2H20), anhydrite (anhydrous calcium sulphate, CaS04) or a mixture thereof.
  • gypsum calcium sulphate dihydrate, CaS04.2H20
  • CaS04.1/2H20 hemi- hydrate
  • anhydrite anhydrous calcium sulphate, CaS04 or a mixture thereof.
  • the thermal treatment applied to the mixture of mineral materials covers all the stages of chemical transformations resulting in clinker. It pertains mainly to the heating, to the decarbonation of the limestone, which takes place at around 850°C and to the clinkering step, which takes place at around 1450°C. Decarbonation corresponds to the transformation reaction of the limestone into lime. Clinkering corresponds to the reaction resulting in the formation of the minerals of the clinker.
  • the pre-heating step and most of the decarbonation generally take place in a decarbonation tower, whilst the remaining decarbonation and the clinkering step take place in a cement kiln.
  • the decarbonation tower most often comprises a series of cyclones arranged vertically on several levels.
  • the cement raw mix which comes in the form of pulverulent mineral materials, is introduced into the top part of the tower and is put into suspension in each cyclone by hot gases coming from the cement kiln.
  • the raw mix is heated in each cyclone by contact with the gases, then it is separated and falls by gravity into the cyclone on a lower level where it is again put into suspension. After this passage through the different cyclones, the mineral materials are introduced into the cement kiln.
  • the cement kiln generally corresponds to a steel cylinder comprising an interior refractory lining.
  • the steel cylinder is inclined, by a few degrees, relative to the horizontal direction and turns around its axis.
  • the lower end of the kiln is equipped with a burner, which can produce a flame which can reach approximately 10 metres in length.
  • the raw mix is fed into the kiln at the higher end of the cylinder opposite the burner.
  • the rotations and the inclination of the kiln entrain the mineral materials through the kiln. It is desirable that the decarbonation rate of the mineral materials when the mineral materials enter the cement kiln be as high as possible in order to reduce the decarbonation phase in the cement kiln.
  • the decarbonation reaction is indeed a very endothermic reaction, requiring efficient thermal exchanges between the hot gases and the pulverulent mineral materials. Because the cement kiln, is not designed to optimize these exchanges, if the decarbonation phase in the cement kiln is too high, it may be necessary to reduce the flow rate of the material through the kiln.
  • the decarbonation tower generally further comprises a pre-calciner, located along the path of the mineral materials, said pre-calciner corresponds to an enclosure in which fuel is burnt. This makes it possible to increase the degree of decarbonation of the mineral materials, up to approximately 90 % at the input of the cement kiln.
  • a pre-calciner is described in the French patent application FR 2 691 790.
  • the pre-calciner can consume a substantial part of the fuel provided at the cement plant, for example up to 70%.
  • Fuels used in a typical manner comprise petroleum coke, coal, petroleum or natural gas.
  • waste materials are, for example, tyres, household waste, sludge, combustible solids or industrial waste.
  • waste materials are, for example, tyres, household waste, sludge, combustible solids or industrial waste.
  • the fuels have to be shredded and/or ground to be able to be used in significant quantities, for example more than 15 % of the fuel required for the pre-calciner. The cost for preparation of these fuels is therefore not compatible with their use in a cement plant.
  • a feature of an embodiment of the present invention is to resolve, at least partially, the disadvantages of the previously-described pre-calciners.
  • Another feature of an embodiment of the present invention is to make it possible to use waste materials as fuel in a pre-calciner, by limiting their prior treatment, in particular, prior grinding.
  • the pre-calciner can be used in a cement-plant installation.
  • an embodiment of the present invention provides an installation for pre- calcination of pulverulent mineral materials, intended for the production of cement, said installation comprising a pre-calciner, said pre-calciner comprising:
  • At least one first mobile pushing part arranged to push the waste material out of the first chamber, the second chamber being intended to receive the waste material pushed out of the first chamber, and
  • each pushing part is mobile in a translation movement relative to the enclosure.
  • At least part of the waste material is not ground.
  • the waste materials are selected from the group comprising tyres, household waste, sludge, combustible fuels or industrial waste.
  • the installation comprises at least one first actuator connected to the first pushing part and arranged to move the first pushing part in the first chamber between two end positions and the installation comprises at least one second actuator connected to the second pushing part and adapted to move the second pushing part in the second chamber between two end positions.
  • the installation further comprises, a mixing chamber communicating with the enclosure and intended to be fed with fume coming from a burning kiln, and a separation cyclone of the material connected to the reaction chamber by a duct.
  • the installation comprises a first feeding duct of hot gases discharged into the enclosure and a second feeding duct of hot gases discharged into the connecting duct, connecting the mixing chamber to the cyclone.
  • the distance between the base of the second chamber and the base of the first chamber varies from 200 mm to 1200 mm.
  • An embodiment of the present invention provides a process for operating the installation of pre-calcination defined herein above, comprising the following steps:
  • a process for gasification of the waste materials is carried out in the first and second chambers.
  • the residence time of the waste materials in the pre-calciner varies from 5 minutes to 90 minutes.
  • Figure 1 partially represents, in a diagram form, an example of a cement plant comprising an in-line pre-calciner
  • Figure 2 partially represents, in a diagram form, an example of a cement plant comprising a parallel pre-calciner
  • Figure 3 represents in more detail an embodiment of the pre-calciner in Figure 1 ;
  • Figure 4 represents in more detail an embodiment of the pre-calciner in Figure 2;
  • FIGS 5 and 6 are cut sections in diagram form of the pre-calciner of Figures 3 and 4, respectively.
  • Figures 7 and 8 are cut sections of the pre-calciner of Figures 3 and 4, respectively, comparable to the cut section of Figure 6, with two operating steps of the pre-calciner;
  • Figures 9 and 10 represent two other embodiments of the pre-calciner of Figures 1 or 2.
  • the mineral materials provided in a pulverulent state, successively pass through a pre-heater 12, a pre-calciner 14, a cement kiln 16, and a cooler 18.
  • the pre-heater 12 and the pre- calciner 14 form the pre-calcination tower 20.
  • the pre-calciner 14 can be integrated in the pre-heater 12.
  • Pulverulent mineral materials 22, corresponding to a cement raw mix, are fed into the pre-heater 12.
  • the pre-heater 12 can comprise a series of cyclones positioned vertically on several levels.
  • the mineral materials are in the form of a powder, generally at least 90 % by mass is composed of particles having a size less than 100 ⁇ . They comprise, in particular, limestone and materials carrying silicon, alumina and iron, for example clay.
  • the heated mineral materials 28 exiting the pre-heater 12 are calcined in the pre- calciner 14 by the combustion of fuel with pre-heated air coming from the cooler 18 through a duct 30.
  • the pre-heated and pre-calcined materials 34 are fed into the kiln 16 through a junction box 26 to finish the burning by a supply of energy coming from the combustion of fuel 36 with pre-heated air 38 coming from the cooler 18.
  • the burnt product 40 exiting the kiln 16 corresponds to clinker; it is cooled in the cooler 18.
  • the cooled clinker 42 is evacuated from the cooler 18.
  • the arrow 44 in Figure 1 illustrates the excess hot air exiting the cooler 18 and intended for other uses.
  • FIG 2 represents another example of a cement plant installation 45.
  • the cement plant installation comprises the same elements as the cement plant installation 10 represented in Figure 1 the difference being that the pre-calciner 14 is positioned parallel to the pre-heater 12.
  • the pulverulent mineral materials successively pass through the pre-heater 12, the pre-calciner 14, the pre-heater again 12, the cement kiln 16, and the cooler 18.
  • the pre-calcined mineral materials 32 coming from the pre-calciner 14 are re-introduced into the pre-heater 12.
  • Figures 3 and 4 represent two examples in more detail, still remaining in diagram form, of part of the decarbonation tower 20 comprising an embodiment of the pre- calciner 14, respectively for the cement plant installation 10 represented in Figure 1 and for the cement plant installation 45 represented in Figure 2.
  • Figures 5 and 6 are cut sections in diagram form of the pre-calciner 14 of Figure 3 and 4, respectively, according to lines V-V and VI-VI.
  • the pre-calciner 14 comprises an enclosure 50 connected, at its lower part, by a duct 52, to a mixing chamber 54.
  • the mixing chamber 54 is connected by means of a valve 56 to the junction box 26 from which fumes 24 penetrate the lower part of the mixing chamber 54.
  • the upper part of the mixing chamber 54 communicates with a post-combustion duct 57, for example in the form of a gooseneck, discharged into a cyclone 58, wherefrom the pre-calcined mineral materials 34 can be recovered.
  • the enclosure 50 can be axially symmetrical relative to a D axis.
  • the inside wall can comprise an upper portion 60 prolonged by a lower portion 62 forming successive levels around the D axis drawing closer to the D axis from top to bottom. According to a variant of the present invention, the successive levels are on one sole side of the enclosure 50, and are therefore not positioned around the D axis.
  • the inside wall of the enclosure 50 can be made of refractory bricks.
  • the duct 30 further divides into several ducts, in particular one or more ducts 65 arriving in the lower part of the enclosure 50, for example at the level of the duct 52, as represented in Figure 4.
  • the duct 30 further divides into ducts 66 arriving in the upper part of the enclosure 50.
  • Another duct 68 can arrive in the upper part of the mixing chamber 54, as represented in Figure 3, or in the connecting duct 57 of the mixing chamber 54 with the cyclone 58, as represented in Figure 4.
  • Valves not represented in the figures, can be provided for adjustments of the flow rates of the hot gases circulating in the ducts 65, 66 and 68.
  • One duct, 65 and two ducts 66 are represented in Figures 3 and 4 and two ducts
  • the ducts 66 are represented in Figures 5. Nonetheless, a greater number of ducts 65 and 66 can be provided. According to an embodiment of the present invention, the ducts 66 enter the enclosure 50 substantially tangent relative to the inside wall of the enclosure 50 in order to impose a turbulent movement to the gases entering the enclosure 50, as illustrated in Figure 5 by the arrows 68.
  • the ducts 66 communicating with the upper part of the enclosure 50 can carry, for example 80 % of the hot air recovered from the cooler 18.
  • the duct 65 communicating with the lower part of the enclosure 50 can carry, for example 20 % of the hot air recovered from the cooler 18.
  • Ducts 70 supply part of the pulverulent mineral materials to the enclosure 50. These mineral materials can come from another cyclone, not represented in the figures, of the decarbonation tower 20. By way of example, the ducts 70 arrive in the ducts 66 substantially at the level of their junction to the enclosure 50. The ends of the ducts 70 are represented by dotted lines in Figure 5. Disturbance devices can be placed in the ducts 66 and/or ducts 70 to facilitate obtaining a turbulent flow.
  • the enclosure 50 extends from its upper part via a duct 71 communicating with the post-combustion duct 57 and serves to evacuate the gases from the enclosure 50 into the mixing chamber 54.
  • Waste material reaction chambers are placed on several levels on the lower wall 62 of the enclosure 50. The number of levels can vary from 2 to 20, preferably from 2 to 10. In the present embodiment of the present invention, represented in Figures 3 to 6, the reaction chambers are positioned on two levels.
  • Reference 72 designates the closest reaction chamber to the summit of the enclosure 50 and reference 74 designates the reaction chamber closest to the duct 52.
  • Each reaction chamber 72, 74 corresponds to a substantially horizontal portion of the inside wall 62.
  • Each reaction chamber 72, 74 is open on to the internal space of the enclosure 50 at the top and on the side oriented towards the D axis.
  • Ducts 78 are provided for the supply of waste materials into the upper reaction chambers 72.
  • the waste materials can be tyres, household waste, sludge, combustible solids or industrial waste.
  • the waste materials may, at least partially, not be ground or only coarsely ground.
  • the average size of each element of waste material introduced in the enclosure 50 can be comprised in a sphere, the radius of which can vary from 20 to 500 mm.
  • the maximum size of the waste elements of the material introduced in the enclosure 50 can vary from 10 to 1500 mm.
  • each duct 78 opens on to the enclosure 50 in a vertical plane of the upper chamber 72, preferably along the outside border of the upper chamber 72. The waste materials can fall by gravity into the upper chamber 72.
  • the waste materials 80 are represented in diagram form in Figures 3 and 4 in the reaction chambers 72, 74.
  • Shutters or rotating lock ducts can be provided to close the chambers 78 in a leak-proof manner when waste materials are absent.
  • Waste-displacement devices 82 are associated to each reaction chamber 72, 74. In the present embodiment of the invention, four waste-displacement devices 82 are associated to each reaction chamber 72, 74. Each device 82 can comprise actuators
  • the pushing part 86 may have the shape of a block or of a blade and may optionally be traversed by circulation ducts of a cooling liquid.
  • the pushing part 86 can be made of a refractory material.
  • Each actuator 84 can correspond to a hydraulic jack, a pneumatic jack or an actuator with an electric motor.
  • the pushing part 86 can be moved in each reaction chamber 72, 74 between first and second end positions, for example according to a translation movement.
  • the pushing part 86 In the first end position, the pushing part 86 is the farthest from the D axis and therefore penetrates as little as possible into the reaction chamber 72, 74. In the present embodiment of the invention, in the first end position, each pushing part 86 does not substantially penetrate into the enclosure 50. In the second end position, the pushing part 86 is closest to the D axis and therefore penetrates as much as possible into the reaction chamber 72, 74.
  • the pushing part 86 advances into the associated reaction chambers 72, 74, it pushes at least part of the waste materials present in the reaction chambers 72, 74 out of the reaction chamber.
  • the upper and lower chambers 72, 74 are substantially positioned at different levels. Thus, when the waste materials are expelled from the upper chamber 72, they fall into the lower chamber 74. When the waste materials are expelled from the lower chamber 74, they fall into the duct 52.
  • Directions D1 and D2 can be horizontal.
  • the four pushing parts 86 associated to the lower reaction chamber 74 are represented in the first end position.
  • each pushing part 86 can make a back and forth movement between the first end position and a third intermediary position, between the first end position and the second end position.
  • the third intermediary position corresponds, for example from 25 % to 75 %, for example, approximately 50 %, of the total path of the pushing part 86 in the combustion chamber. This means that the pushing part 86 therefore does not penetrate to a maximum in the associated combustion chamber 72, 74.
  • One advantage of this embodiment of the present invention is to reduce the interfaces between the fixed and mobile parts during a production phase of cement. Another advantage is to permanently keep waste material on the fixed and mobile parts. When the cement plant is stopped, the pushing parts 86 can be conveyed to the second end position so that the totality of the waste material is evacuated from the pre-calciner.
  • a burner can optionally be present in the enclosure 50 or in the duct 52. Preferably, there is not a burner in the enclosure 50 or in the duct 52.
  • the decarbonation tower 20 can further comprise a standard pre- calciner equipped with a burner.
  • the decarbonation tower 20 operates in the following manner. Pulverulent mineral particles are introduced in the enclosure 50 via the ducts 70.
  • the mineral materials can come from another cyclone of the decarbonation tower 20, and may already be heated and partially decarbonated.
  • the particles of mineral materials are entrained by the gases present in the enclosure 50, in particular, gases 64 coming from the cooler 18 and supplied by the ducts 65, 66.
  • the particles of mineral materials After passing through the pre-calciner 14, the particles of mineral materials are entrained through the duct 71 , then through the post-combustion duct 57.
  • the particles of mineral materials are entrained by the fumes 24 coming from the kiln 16, into the cyclone 58, where they are separated and fall by gravity to the input of the kiln 16.
  • the duration of the passage of the particles of mineral materials in the enclosure 50 can vary from 0.1 seconds to 10 seconds, in particular by the order of 2 seconds.
  • the enclosure 50 is predominant in the enclosure 50.
  • the supply of dioxygen can be provided by the gases 64 coming from the cooler 18.
  • a gasification process is predominant when there is not a mix between the dioxygen and the waste materials.
  • the average temperature in the enclosure 50 can vary from 700°C to 1000°C. Combustion reactions can nevertheless be present simultaneously with the gasification process.
  • the hot gases from the gasification process of the waste materials 80 mix with the hot gases 64 from the cooler 18 and induce the combustion and decarbonation of the particles of mineral materials.
  • the waste materials are introduced in the upper chamber 72 via the ducts 78.
  • the upper pushing parts 86 are moved in the upper chamber 72 in order to entrain the fall of the waste material from the upper chamber 72 to the lower chamber
  • the fall of the waste material from the upper chamber 72 into the lower chamber 74 makes it possible to advantageously stir the waste material during the gasification process, making it possible to increase the quantity of gasified waste material.
  • the height of the fall of the waste material between the base of the upper chamber 72 and the lower chamber 74 can vary from 200 mm to 1200 mm, in particular by the order of 600 mm.
  • the evacuation of the waste material is carried out by a pushing part moved in a translation movement by an actuator, which is to say, by a system with a simple structure and a robust operating procedure, which is compatible with the strict operating specifications present in the pre-calciner 14.
  • Figures 7 and 8 illustrate a sequence of the action of the pushing parts 86 of the lower chamber 74 during a production phase of cement.
  • the pushing parts 86 represented at the top and bottom of the figure are in the first end position and the pushing parts 86 represented on the right and left of the figure are in the third intermediary position.
  • the pushing parts 86 represented on the left and right of the figure are in the first end position and the pushing parts 86 represented on the top and bottom of the figure are in the third intermediary position.
  • the pushing parts 86 can be moved according to successive cycles, each cycle comprising the successive passage of the pushing parts 86 by the configurations represented in Figures 7, 6, 8, 6 and again in Figure 7.
  • the pushing parts 86 associated with the upper chamber 72 can be moved in a comparable manner.
  • an operating cycle as described above, can be carried out to evacuate the totality of the waste material present in the pre-calciner, the difference being that the pushing parts move to the second end position.
  • the precalciner 14 comprises a regulation system of the production of energy, which is provided by gasification of the waste materials. This can be carried out by controlling the action sequence of the pushing parts 86 of the upper chamber 72 and the lower chamber 74, by controlling the input flow rate of the waste material in the pre- calciner and the flow rate in the ducts 65 and 66.
  • the temperature in the enclosure 50 can be measured for this regulation as well as a representative measurement taken of the energy provided by gasification of the waste material.
  • the residence time of the waste materials in the enclosure 50 can vary from 5 minutes to 90 minutes, in particular within the order of one hour.
  • the dimensions of the pre-calciner 14 are adapted to the desired flow rate of the cement kiln 16.
  • the feed flow rate of the waste material in the enclosure 50 depends on the dimensions of the precalciner 14 and on the flow rate of the cement kiln 16.
  • the reception surface of waste material from the upper 72 and lower 74 chambers can vary from 20 m 2 to 100 m 2 , in particular by the order of 60 m 2 .
  • the maximum path of each pushing part 86 can be from 10 cm to 1 .50 m.
  • the combustion reactions of the waste material can be predominant in the enclosure 50.
  • supply ducts of pressurized air can be provided in the reaction chambers 72, 74.
  • Figure 9 represents another embodiment of the present invention of a pre- calciner 100 comprising all the elements of the precalciner 14 represented in Figures 3 and 4, the difference being that the upper wall 92 of each pushing part 86 also plays the role of a combustion chamber.
  • the precalciner 100 therefore comprises combustion chambers on four levels.
  • the waste material is supplied by the ducts 78 on the upper walls 92 of the upper pushing parts 86 which form the first reaction chamber 94.
  • the upper pushing parts 86 When the upper pushing parts 86 are far from the D axis, part of the waste material present on the upper walls 92 of the upper pushing parts 86, falls onto the parts of the wall 62 in front of the upper pushing parts 86, which form the second reaction chamber 96.
  • the upper pushing parts 86 When the upper pushing parts 86 are close to the D axis, they push part of the waste material out of the second reaction chamber 96. This waste material falls onto the upper walls 92 of the lower pushing parts 86, which form the third reaction chamber 98.
  • Figure 10 represents another embodiment of the present invention of a precalciner 110 in which the reaction chambers 1 12, 114 are positioned in a staircase manner and oriented in the same direction, one being the extension of the other.
  • the waste materials are introduced on one single side of the enclosure 50 and advance in a linear manner.
  • the pre-calciner 14 has been described as being connected to the mixing chamber 54, which is itself connected to the cyclone 58 by an elbow duct 57, the precalciner 14 can be directly connected to the cyclone 58 or directly to the input of the kiln 16.
  • a lower chamber is associated to each upper chamber, it is clear that the dimensions of a lower chamber can be sufficiently significant to receive the waste materials of two or more upper chambers.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Abstract

Cette invention concerne une installation pour la précalcination (20) de matières minérales pulvérulentes (22), servant à la production de ciment, ladite installation comprenant un four de pré-calcination (14) comprenant une enceinte (50), des conduits d'alimentation (70) pour l'introduction de matières minérales dans l'enceinte, des conduits d'alimentation (65, 66) pour l'introduction de gaz chauds dans l'enceinte, au moins un conduit d'évacuation (71) pour l'évacuation des gaz chauds de l'enceinte, une première chambre (72) communiquant avec l'enceinte, des conduits d'alimentation (78) pour l'introduction de déchets (80) dans la première chambre, au moins une seconde chambre (74) communiquant avec l'enceinte, au moins une première partie poussoir mobile (86) conçue pour pousser les déchets hors de la première chambre, la seconde chambre étant conçue pour recevoir les déchets poussés hors de la première chambre, et au moins une seconde partie poussoir mobile (86) conçue pour pousser les déchets hors de la seconde chambre.
EP14771809.2A 2013-09-10 2014-09-08 Installation et procédé de précalcination Withdrawn EP3044181A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1358693A FR3010405A1 (fr) 2013-09-10 2013-09-10 Installation et procede de precalcination
PCT/EP2014/069079 WO2015036361A1 (fr) 2013-09-10 2014-09-08 Installation et procédé de précalcination

Publications (1)

Publication Number Publication Date
EP3044181A1 true EP3044181A1 (fr) 2016-07-20

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EP14771809.2A Withdrawn EP3044181A1 (fr) 2013-09-10 2014-09-08 Installation et procédé de précalcination

Country Status (6)

Country Link
EP (1) EP3044181A1 (fr)
CN (1) CN105517972A (fr)
FR (1) FR3010405A1 (fr)
MX (1) MX2016002956A (fr)
PH (1) PH12016500440A1 (fr)
WO (1) WO2015036361A1 (fr)

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DE102016111291A1 (de) * 2016-06-21 2017-12-21 Thyssenkrupp Ag Vorrichtung und Verfahren zur Wärmebehandlung von mineralischem Gut
DE102016211181A1 (de) * 2016-06-22 2017-12-28 Thyssenkrupp Ag Anlage und Verfahren zur thermischen Behandlung von flugfähigem Rohmaterial

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MX2016002956A (es) 2016-11-18
PH12016500440A1 (en) 2016-05-16
WO2015036361A1 (fr) 2015-03-19
CN105517972A (zh) 2016-04-20
FR3010405A1 (fr) 2015-03-13

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