EP0245295A1 - Utilisation de dechets a pouvoir calorifique pour la production de ciment - Google Patents

Utilisation de dechets a pouvoir calorifique pour la production de ciment

Info

Publication number
EP0245295A1
EP0245295A1 EP86905716A EP86905716A EP0245295A1 EP 0245295 A1 EP0245295 A1 EP 0245295A1 EP 86905716 A EP86905716 A EP 86905716A EP 86905716 A EP86905716 A EP 86905716A EP 0245295 A1 EP0245295 A1 EP 0245295A1
Authority
EP
European Patent Office
Prior art keywords
pyrolysis
preheater
rotary kiln
clinker
waste
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Withdrawn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
EP86905716A
Other languages
German (de)
English (en)
Inventor
Albrecht Wolter
Wolfgang Grigel
Rolf Hartmann
Alexander Grisar
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.)
Grisar Alexander
Kloeckner Humboldt Deutz AG
Original Assignee
Dyckerhoff Engineering GmbH
Kloeckner Humboldt Deutz AG
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 Dyckerhoff Engineering GmbH, Kloeckner Humboldt Deutz AG filed Critical Dyckerhoff Engineering GmbH
Publication of EP0245295A1 publication Critical patent/EP0245295A1/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Withdrawn legal-status Critical Current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
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • 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
    • F27B7/2016—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
    • 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
    • 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 invention relates to a method for the recovery of calorific value-containing waste materials, in particular domestic and industrial waste, in connection with the heat treatment of fine-grained, mineral substances for the production of binders, in particular cement clinker, by preheating and calcining the raw meal in a preheater, firing in a rotary kiln and cooling the clinker with air, using heat from the heat treatment for pyrolysis of the waste materials in a smoldering furnace, the pyrolysis gases thereby incinerated in the preheater and the pyrolysis residues being introduced into the preheater or into the rotary kiln, and a device for carrying out the method.
  • ER S ATZBLATT to dry, to carry out pyrolysis by indirect heating, and to burn the relatively low-ballast pyrolysis gas not in the rotary kiln but in the hottest area of the preheater, where a process temperature of approx. 850 ° C is required.
  • the above-mentioned process basond.ers is to become economical if the raw meal mixture is heated in a preheater upstream of the kiln, where all of the pyrolysis gases are burned from the smoldering furnace, and the smoldering furnace is heated exclusively with kiln exhaust gas and the solid pyrolysis residues are introduced into the furnace directly or indirectly via the lowest preheating stage.
  • this process uses the preferred minerals containing carbon or hydrocarbons, in particular bituminous limestone or bituminous slate or bituminous marl, the process can be optimized relatively easily since the composition of these calorific value-containing starting materials fluctuates only relatively little.
  • Corresponding fluctuations in the chemical composition and the amount of pyrolysis residues occur. This means that only a very limited amount of waste can be used with this method if an even clinker quality is to be ensured.
  • the object of the invention is to modify a process for the preparation of binders, in particular cement clinker, in connection with the pyrolysis of waste materials, in particular domestic and industrial waste, so that a larger amount of the waste can be used without
  • the object is achieved in that the pyrolysis residues are homogenized before being fed into the preheater or in the rotary kiln and some of the furnace gases are removed from the rotary kiln.
  • Pyrolysis is understood here to mean degassing, gasification and / or partial incineration of the waste in a smoldering furnace.
  • REPLACEMENT LEAF at least partially added to the clinker again during grinding.
  • the heat required for the pyrolysis can be obtained either by introducing exhaust gas from the rotary kiln or by introducing hot air from the cooler into the smoldering furnace. By introducing air into the smoldering furnace there is a partial combustion and thus an additional heat transfer to the pyrolysis process.
  • the amounts of OTeT.gas from the rotary kiln and the amounts of air from the cooler can be controlled depending on the desired pyrolysis temperature.
  • the proportion of flammable constituents of the pyrolysis residues depends on the pyrolysis temperature. If the pyrolysis is carried out at relatively low temperatures, the pyrolysis residue will still contain a considerable amount of combustible constituents, so that the utilization of these residues as fuel in the combustion zone of the rotary kiln has to be considered, especially if part of the combustion air passes through there Oxygen is replaced.
  • the combustion fume required for the combustion of the pyrolysis gas and, if necessary, the homogenized PyroXyser residue in the preheater, preferably in the calciner of the preheater, is obtained either directly from the clinker cooler through the rotary kiln or through a separate line (tertiary air line).
  • the separate air duct is particularly advantageous because it allows both the rotary kiln and the bypass discharge to be made smaller. This variant is to be preferred in particular if the combustion in the rotary kiln takes place by partial supply of oxygen and / or if a part of the rotary kiln exhaust gases is otherwise used.
  • coal dust is used for cement burning
  • the pyrolysis residues can be added to the coal grinding and homogenized and ground together with the coal.
  • the homogenized solid residues of the waste materials are given up in the hot area of the preheater, in particular in the calciner, especially if they contain relatively small amounts of combustibles. This means that a long distance is available for mixing into the clinker, which causes the clinker to become even more uniform.
  • the pyrolysis residue is almost free of combustible components, it can be fed to the mill for the preparation of the raw cement meal.
  • the waste materials are pre-dried before pyrolysis.
  • a measure is particularly indicated for the recycling of sludge, the water content of which is usually above 50%.
  • the hot gas introduced into the preheater is then no longer "diluted" by the water ballast.
  • large amounts of moist waste can be recycled without impairing the clinker quality and without additional fuel.
  • the heat from the preheater is sufficient to pre-dry the waste materials. If the vapors of the drying that are not conducted in a closed circuit are directed into a part of the preheater that is at least 800 ° C., an unpleasant smell from the waste drying is avoided with certainty.
  • REPLACEMENT LEAF for example, to screen large, disruptive components.
  • a previous comminution can also be carried out to improve the homogenization effect.
  • the pyrolysis residues leaving the smoldering furnace are preferably cooled in a water bath and used for further use from there.
  • they can be homogenized in mixed beds or homogenization silos.
  • Such devices are generally known. They are used in particular in the processing of raw cement material and also serve as a buffer store.
  • oxygen is used at least in part for the combustion in the rotary tube furnace instead of the air.
  • the partial gas discharge can be kept narrow and the capacity of the preheater can be better used for the combustion of the pyrolysis gases.
  • the use of oxygen allows the use of inferior fuels, especially pyrolysis residues.
  • a relief of the preheater can also be achieved in that the exhaust gas from the rotary kiln is not passed into the preheater, but is otherwise used for energy, for example for generating district heating or electricity.
  • some of the exhaust gases from the preheater can also be discharged and, for example together with the bypass gas from the rotary kiln, cooled and dedusted.
  • a device for carrying out the method according to the invention consists of two parts of the system, a clinker burning system, consisting of preheater, if possible with calciner, rotary kiln and clinker cooler and a smoldering furnace, in which the waste is fed and where it is charred and / or partially burned when heat is transferred from the kinker burning system. is pyrolyzed), with devices for homogenizing the pyrolysis residues after charring and / or partial incineration of the waste and a line for the partial removal of hot rotary kiln gases.
  • a homogenizer consists of at least one silo or a stockpile with a mixing device, as well as a control proportional to the quantity of raw meal.
  • the partial gas discharge is preferably located at the inlet of the rotary kiln. At the temperatures prevailing there, most of the interfering substances are in the gas phase.
  • the smoldering furnace is designed as a rotary tube furnace.
  • the waste materials can be well aerated and pre-homogenization also occurs.
  • the invention is further explained below using an exemplary embodiment shown in the block diagram.
  • the diagram shows only the directions of the gas and solid flows, but no valves, acceleration, control and regulating elements.
  • the clinker combustion system consists of a preheater 1 (here formed from four heat exchanger cyclones 2 with the calciner 3), a rotary kiln 4 and an air cooler 5, here designed as a grate cooler.
  • Raw meal 6 is fed into the upper area of the preheater 1, the clinker at 7 is removed from the cooler 5.
  • heating value-containing waste 8 is vorgetxTjck ⁇ et via the dryer 9 heated with waste heat from the preheater 1 before it reaches the smoldering furnace 11 via the line 10.
  • the gases from the rotary kiln 4 pass via the line 12 directly into the calciner 3, into which fuel and hot air from the cooler are also conducted.
  • at least some of the rotary kiln exhaust gases are passed via 13 and / or some of the cooler exhaust air via 17 into the smoldering furnace 11; there is a pyrolysis and a separation of the waste into combustible pyrolysis gases 14 and solid pyrolysis residues 15, which as a rule also contain components containing calorific value.
  • the pyrolysis residues from the smoldering furnace 11 are cooled in a water bath 19 and then subjected to magnetic separation and / or sieving, or, if appropriate, comminution in the conditioning stage 20 before they are fed to the homogenization 18. Magnetic components and unwanted oversize particles are removed at 25.
  • REPLACEMENT LEAF it is discharged at 30, for example, and is given to the rotary kiln 4 together with high-quality fuel, for example coal dust, via the burner 21.
  • a portion of the hot furnace exhaust gases can be removed via line 26, which results in a dilution of the substances in the circuit which are undesirable for the clinker production and condense again on cooling of the raw meal.
  • greater attention must be paid to interrupting or reducing such a cycle.
  • the further treatment of the gas drawn off at 26 - essentially cooling and dedusting - is no longer shown. Depending on the type of pollutants, these dusts can be added to the clinker again during grinding in certain quantities.
  • Part of the combustion air 31 for the rotary kiln 4 can be replaced by oxygen 32.
  • REPLACEMENT LEAF According to this procedure, half a kilogram of household waste per 1 kg of clinker can be disposed of.
  • the amount of high-quality fuel for the production of 1 kilogram of clinker should be able to be reduced to 300 kcal, because the hot gas from the smoldering furnace can be sufficient to cover the heating requirements of the preheater, and the pyrolysis residues can at least partly be used in the flame zone of the rotary kiln .-.
  • the exhaust gases 27 of the preheater 1 are sufficient for predrying the waste materials 8 in the dryer 9.
  • the vapors 28 of the drying, which are not circulated, are introduced into the preheater 1 where there is still at least 800 ° C. This destroys all odorous substances from the drying of waste.
  • the process according to the invention does not require any significant modification and expansion of conventional plants for the production of binders, since the additional gases from waste recycling are not ballast but fuel.
  • the smoldering furnace 11 is shown as a rotary drum operated in the Gjage ⁇ strom. However, it is also possible to use a * DC drum or another type of oven.

Abstract

Afin d'exploiter dans une plus grande mesure les possibilités offertes par la récupération de déchets pour la production de klinker, il est nécessaire d'homogénéiser les résidus solides de la carbonisation ou de la combustion partielle des déchets, avant leur adjonction au klinker de ciment et d'écluser une partie des gaz chauds de combustion chargés de matières toxiques. La quantité relativement élevée de déchets à pouvoir calorifique permet en outre des économies considérables d'énergie primaire lors de la production de klinker.
EP86905716A 1985-09-21 1986-09-18 Utilisation de dechets a pouvoir calorifique pour la production de ciment Withdrawn EP0245295A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853533775 DE3533775A1 (de) 1985-09-21 1985-09-21 Verfahren und vorrichtung zur verwertung heizwerthaltiger abfallstoffe in verbindung mit der herstellung von bindemitteln
DE3533775 1985-09-21

Publications (1)

Publication Number Publication Date
EP0245295A1 true EP0245295A1 (fr) 1987-11-19

Family

ID=6281624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86905716A Withdrawn EP0245295A1 (fr) 1985-09-21 1986-09-18 Utilisation de dechets a pouvoir calorifique pour la production de ciment

Country Status (3)

Country Link
EP (1) EP0245295A1 (fr)
DE (1) DE3533775A1 (fr)
WO (1) WO1987001692A2 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3717542A1 (de) * 1987-05-25 1988-12-15 Krupp Polysius Ag Verfahren und anlage zur versorgung eines verbrauchers mit pyrolysegas
DE3735906A1 (de) * 1987-10-23 1989-05-18 Kloeckner Humboldt Deutz Ag Verfahren zur thermischen entsorgung organischer oder organisch-kontaminierter abfallstoffe
DE3803170A1 (de) * 1988-02-03 1989-08-17 Krupp Polysius Ag Vorrichtung und anlage zur herstellung von zementklinker
DE58902128D1 (de) * 1988-06-21 1992-10-01 Aicher Max Verfahren zur behandlung von klaerschlamm.
DE4041251A1 (de) * 1990-12-21 1992-06-25 Krupp Polysius Ag Verfahren und anlage zur herstellung von gebranntem gut sowie zur erzeugung von elektrischer energie
DE4208977C1 (fr) * 1992-03-20 1993-07-15 Metallgesellschaft Ag, 6000 Frankfurt, De
DE4303170A1 (de) * 1993-02-04 1994-08-11 Kloeckner Humboldt Deutz Ag Verfahren und Anlage zur thermischen Behandlung von mehlförmigen Rohmaterialien
DE4338927A1 (de) * 1993-11-15 1995-05-18 Kloeckner Humboldt Deutz Ag Verfahren und Anlage zur thermischen Verwertung von Abfallstoffen
DE10202776A1 (de) * 2002-01-25 2003-07-31 Kloeckner Humboldt Wedag Anlage zur Herstellung von Zementklinker
AT504193B1 (de) * 2006-09-14 2008-06-15 Holcim Ltd Verfahren zum vorbehandeln von mit kohlenstoffträgern kontaminierten chargen
PL208970B1 (pl) 2008-04-03 2011-07-29 Zdzisław Sukiennik Sposób ciągłego przetwarzania surowców energetycznych na węglowodory popirolityczne w skojarzeniu z wytwarzaniem materiałów budowlanych
EP2342168A1 (fr) * 2008-09-17 2011-07-13 FLSmidth A/S Fours rotatifs pour carburants alternatifs
WO2010124702A1 (fr) * 2009-04-30 2010-11-04 Schwenk Zement Kg Procédé et dispositif pour la préparation du combustible dans un processus de cuisson de clinkers
AT512113B1 (de) * 2011-10-25 2016-06-15 Holcim Technology Ltd Verfahren und vorrichtung zum aufarbeiten von nassen, organische komponenten enthaltenden abfallstoffen
DE102012022179B4 (de) 2012-11-13 2014-07-03 Khd Humboldt Wedag Gmbh Brenneinrichtung für stückige Brennstoffe mit mechanischem Brennstofftransport
DE102013006237B4 (de) 2013-04-11 2016-06-16 Khd Humboldt Wedag Gmbh Verfahren zum Betrieb einer Anlage zur Herstellung von Zement sowie Anlage zur Herstellung von Zement

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK149735C (da) * 1975-10-30 1987-02-16 Ass Portland Cement Fremgangsmaade til calcinering af mineraler
GB1510392A (en) * 1976-01-19 1978-05-10 Ass Portland Cement Portland cement manufacture and utilisation of waste matter
DE2627056A1 (de) * 1976-06-16 1977-12-29 Dotternhaus Portland Zement Verfahren zur herstellung von zementklinkern
AT387273B (de) * 1976-10-29 1988-12-27 Perlmooser Zementwerke Ag Verfahren zur verwertung von abfallstoffen mit brennbaren bestandteilen
SE420646B (sv) * 1979-01-08 1981-10-19 Cementa Ab Sett att destruera helso- och miljofarliga avfall samt ungssystem for genomfarande av settet
FR2446266B1 (fr) * 1979-01-09 1985-07-12 Lafarge Conseils Procede et installation pour la fabrication de clinker de cimenterie
DE3218232A1 (de) * 1982-05-14 1984-02-09 Quittkat, Wolfram G., Dr.-Ing., 8183 Rottach-Egern Verfahren zum brennen von karbonatischen rohstoffen
DE3320670A1 (de) * 1983-06-08 1984-12-13 Wolfram G. Dr.-Ing. 8183 Rottach-Egern Quittkat Verfahren und vorrichtung zur herstellung von bindemitteln unter verwendung heizwerthaltiger ausgangsstoffe
EP0141932A3 (fr) * 1983-08-25 1986-11-26 Klöckner-Humboldt-Deutz Aktiengesellschaft Procédé et installation pour l'élimination sans substance nuisible de matières nocives et résiduaires de pouvoir calorifique inférieur, en particulier des déchets, par combustion
DE3346901C2 (de) * 1983-12-21 1986-10-09 Mannesmann AG, 4000 Düsseldorf Verfahren zur rückstandsfreien energetischen Nutzung zellulosereicher Abfälle und Anlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8701692A2 *

Also Published As

Publication number Publication date
DE3533775C2 (fr) 1990-08-02
DE3533775A1 (de) 1987-03-26
WO1987001692A2 (fr) 1987-03-26
WO1987001692A3 (fr) 1988-04-21

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