EP2231545A2 - Procédé d'amélioration des propriétés de produit de clinker lors de la combustion de farine crue - Google Patents

Procédé d'amélioration des propriétés de produit de clinker lors de la combustion de farine crue

Info

Publication number
EP2231545A2
EP2231545A2 EP08871151A EP08871151A EP2231545A2 EP 2231545 A2 EP2231545 A2 EP 2231545A2 EP 08871151 A EP08871151 A EP 08871151A EP 08871151 A EP08871151 A EP 08871151A EP 2231545 A2 EP2231545 A2 EP 2231545A2
Authority
EP
European Patent Office
Prior art keywords
synthesis gas
clinker
alternative fuels
fuels
flame temperature
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Withdrawn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
EP08871151A
Other languages
German (de)
English (en)
Inventor
Albert Obrist
Peter Von Zedtwitz
Christian Wieckert
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.)
Holcim Technology Ltd
Original Assignee
Holcim Technology Ltd
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 Holcim Technology Ltd filed Critical Holcim Technology Ltd
Publication of EP2231545A2 publication Critical patent/EP2231545A2/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Withdrawn legal-status Critical Current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
    • C04B7/4446—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 the fuel being treated in a separate gasifying or decomposing chamber, e.g. a separate combustion chamber

Definitions

  • the invention relates to a method for improving the product properties of clinker in the burning of raw meal in a clinker or cement kiln, in which at least partially alternative fuels are used.
  • a decrease in the temperature in the range of the burner by 200 to 300 ° C by using low-grade fuels and in particular by using alternative fuels leads to a less favorable temperature profile over the longitudinal axis of the rotary kiln and usually leads to the ideally extending over a short range Maximum temperature over a longer range at much lower temperature extends.
  • the observed reduction in the quality of the clinker primarily affects the clinker reactivity.
  • the criterion for measuring this reactivity is the reactivity index, defined as Blaine divided by the early strength after one day.
  • the use of low-grade fuels also leads to a reduction in production capacity in tonnes per day and to an increase in heat demand.
  • gasification reactors have already been proposed.
  • the shift of the ratio H 2 to CO can be achieved at temperatures of 550 to 750 ° C in a particularly simple manner with water vapor. At temperatures below 550 ° C, graphite, methane, CO 2 and H 2 O are thermodynamically stable. Only at much higher temperatures, a substantially uniform phase of H 2 and CO can be achieved.
  • the invention now starts from all these theoretical assumptions and now aims to render alternative fuels useful for improving the product properties of clinker when burning raw meal in a particularly advantageous manner.
  • the method according to the invention consists in subjecting waste products or alternative fuels containing organic substances to thermal dissociation and a reaction of the dissociation products or gasification using radiant energy and the product gas formed in this way Synthesis gas for raising the flame temperature is supplied to the burners of the main furnace.
  • the process according to the invention is carried out in such a way that product gas or synthesis gas is supplied to the burners of the main furnace in amounts of from 5 to 50% by weight, based on the introduced energy content of the fuel quantity used for the main combustion.
  • the synthesis gas produced in this way is used, overcoming the view represented by the experts, which has aimed that with solar gasifiers for alternative fuels as a rule a sufficient degree of implementation for an economic production is not possible.
  • This view as expressed, for example, in EP 548889, could be overcome, in particular, by proceeding in the context of the invention such that the alternative fuels in the form of a bed having a maximum particle size of 250 mm, preferably 200 mm, be used in a solar gasification reactor for the production of synthetic gas.
  • the inventive method comes with a very simple preparation of the fuels, which could be shown according to the invention that in particular when inferior products are used with a high proportion of easily volatilizing or vaporizing substances, here on the addition of water or water vapor can even be partially dispensed with, since the required Amount of steam directly from the Moisture of the starting materials is formed, or synthesis gas (essentially CO and H 2 ) is formed directly by conversion of the bound in the starting material H and O.
  • the procedure is such that the thermal dissociation of the alternative fuels is carried out at temperatures of above 700 ° C., preferably from 850 ° C. to 1300 ° C., these temperatures being optimum with respect to the production of the desired CO / Represent H 2 mixtures.
  • H 2 O steam
  • H 2 + CO synthesis gas
  • the method for improving the product properties of clinker is advantageously carried out so that the synthesis gas is supplied to the burners of the main furnace in an amount required for raising the flame temperature by 50 ° C. to 200 ° C., preferably the synthesis gas being generated substantially without pressure, cooled to temperatures below 550 ° C, preferably below 500 ° C and transported with a blower in the burner lances.
  • the non-pressurized production of the synthesis gas allows particularly simple facilities in which the alternative fuels can be used as a bed with relatively large particle sizes, wherein in the context of non-pressurized generation even at speaking lower temperatures a good turnover is achieved.
  • the process is carried out so that the burner or flame temperature is adjusted to values above 1700 ° C, preferably 1800 ° C to 2000 ° C with the synthesis gas.
  • any low-grade or alternative fuels can be used in the context of the method according to the invention, with sludge and waste having high contents of easily volatilizing or evaporating substances being found to be particularly suitable as alternative fuels.
  • the advantages can also be realized for conventional fuels such as low-grade coals, cokes and biomass.
  • the inventive method it is possible to increase the strength of the product obtained (cement) without increasing the fineness accordingly, whereby the advantage is achieved that only a lower water / cement ratio is required for the production of concrete.
  • the correspondingly increased reactivity thus leads to significant advantages in the subsequent processing of the product.
  • the production capacity of an opening plant with a precalciner can be achieved, for example, by substitution of about 50% of that required in the main firing. Chen energy can be increased by 3 to 4% by the synthesis gas according to the invention, while the total energy demand can be reduced by 1 to 2% and the C0 2 emissions from the fuels by up to 9%.
  • blowers used for the pressure increase required after the unpressurized generation of synthesis gas require a corresponding cooling of the product gas in order to keep the investments for the blowers correspondingly lower, such cooling to temperatures below 500 ° C. in a particularly simple manner, for example using contaminated Water is formed, which is transformed via a heat exchanger in contaminated water vapor and then passed into the gasification reactor.
  • it is essential to dispense with the comminution, which was customary to particle sizes of less than 5 mm, and in particular from 2 to 5 mm, in contrast to conventional combustion in the main furnace.
  • a number of genuine waste materials can be used, which have hitherto not been offered for use in the main furnace due to their properties (water content, consistency).
  • the required vapor content in the production of synthesis gas can be kept low in the context of the method according to the invention, since the steam gasification of carbon makes much lower contributions to the production of synthesis gas than the reaction of the substantially hydrocarbon-containing starting materials.
  • stoichiometric water vapor additions are always required.
  • the high-quality product gases can be stored as needed and also be supplied to other uses such as use in a precalciner. At this point, however, the fuel quality requirements are not directly comparable with the flame temperature requirements in the cement kiln.
  • the one for the gasification required water vapor content can preferably be obtained by using contaminated water by heat recovery during the cooling of the product gas.
  • 1 denotes the charging bunker for low-grade or alternative fuels.
  • the material passes into a solar reactor 2, in which concentrated solar energy is schematically indicated by the arrow 3.
  • the product gas formed passes through a line 4 at temperatures of about 1100 ° C in a heat exchanger 5, in which water, in particular contaminated water from a tank 6 can be added as steam via the line 7 to the solar reactor 2.
  • Ashes can be discharged via a line 8 and a mill 9 are abandoned.
  • the cooled to temperatures of about 500 ° C product gas is added via a blower 10 to the burners of a rotary kiln 11, wherein unused amounts of gas via a line 12 to a memory and fed via a line 14 in turn into the rotary kiln 11.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un procédé d'amélioration des propriétés de produit de clinker lors de la combustion de farine crue dans un four à clinker ou à ciment, dans lequel des combustibles au moins partiellement inférieurs ou alternatifs sont employés. Selon le procédé, des déchets ou des combustibles inférieurs ou alternatifs contenant des substances organiques sont soumis à une dissociation thermique et à une réaction des produits de dissociation à l'aide d'énergie de rayonnement. Le gaz de produit ou de synthèse ainsi formé est acheminé vers les brûleurs de la combustion principale pour augmenter la température de flamme.
EP08871151A 2007-12-21 2008-12-18 Procédé d'amélioration des propriétés de produit de clinker lors de la combustion de farine crue Withdrawn EP2231545A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0211507A AT505927B1 (de) 2007-12-21 2007-12-21 Verfahren zum verbessern der produkteigenschaften von klinker beim brennen von rohmehl
PCT/IB2008/003533 WO2009090478A2 (fr) 2007-12-21 2008-12-18 Procédé d'amélioration des propriétés de produit de clinker lors de la combustion de farine crue

Publications (1)

Publication Number Publication Date
EP2231545A2 true EP2231545A2 (fr) 2010-09-29

Family

ID=40600452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08871151A Withdrawn EP2231545A2 (fr) 2007-12-21 2008-12-18 Procédé d'amélioration des propriétés de produit de clinker lors de la combustion de farine crue

Country Status (10)

Country Link
US (1) US8475587B2 (fr)
EP (1) EP2231545A2 (fr)
AR (1) AR069786A1 (fr)
AT (1) AT505927B1 (fr)
AU (1) AU2008348039B2 (fr)
EG (1) EG26144A (fr)
MA (1) MA31932B1 (fr)
MX (1) MX2010006705A (fr)
WO (1) WO2009090478A2 (fr)
ZA (1) ZA201004735B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8771387B2 (en) 2009-06-09 2014-07-08 Sundrop Fuels, Inc. Systems and methods for solar-thermal gasification of biomass
FR2966837B1 (fr) * 2010-10-27 2013-08-16 Vicat Procede et installation pour la production de gaz de synthese
US8800498B2 (en) * 2010-12-30 2014-08-12 Kellogg Brown & Root Llc Systems and methods for exchanging heat in a gasification system
AT514211B1 (de) 2013-04-23 2017-03-15 Holcim Technology Ltd Vorrichtung zur solarthermischen Vergasung von kohlenstoffhaltigem Einsatzmaterial
AT519060B1 (de) * 2016-09-09 2018-07-15 Baumit Beteiligungen Gmbh Verfahren zum Brennen von Kalk oder Zement mit Synthesegas

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Also Published As

Publication number Publication date
AU2008348039B2 (en) 2013-11-28
US20100282131A1 (en) 2010-11-11
US8475587B2 (en) 2013-07-02
AT505927A4 (de) 2009-05-15
WO2009090478A3 (fr) 2010-05-27
AT505927B1 (de) 2009-05-15
WO2009090478A2 (fr) 2009-07-23
AR069786A1 (es) 2010-02-17
MA31932B1 (fr) 2010-12-01
MX2010006705A (es) 2011-03-29
EG26144A (en) 2013-03-27
ZA201004735B (en) 2011-03-30
AU2008348039A1 (en) 2009-07-23

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