EP4394298A1 - Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen - Google Patents

Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen Download PDF

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Publication number
EP4394298A1
EP4394298A1 EP22217327.0A EP22217327A EP4394298A1 EP 4394298 A1 EP4394298 A1 EP 4394298A1 EP 22217327 A EP22217327 A EP 22217327A EP 4394298 A1 EP4394298 A1 EP 4394298A1
Authority
EP
European Patent Office
Prior art keywords
shaft
kiln
heated
calcining
gaseous effluent
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Withdrawn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
EP22217327.0A
Other languages
English (en)
French (fr)
Inventor
Olivier VAN CANTFORT
Tristan CLOAREC
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.)
Lhoist Recherche et Developpement SA
Original Assignee
Lhoist Recherche et Developpement 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 Lhoist Recherche et Developpement SA filed Critical Lhoist Recherche et Developpement SA
Priority to EP22217327.0A priority Critical patent/EP4394298A1/de
Priority to EP23841226.6A priority patent/EP4643070A1/de
Priority to PCT/EP2023/087892 priority patent/WO2024141579A1/en
Publication of EP4394298A1 publication Critical patent/EP4394298A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/02—Shaft or like vertical or substantially vertical furnaces with two or more shafts or chambers, e.g. multi-storey
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/02—Shaft or like vertical or substantially vertical furnaces with two or more shafts or chambers, e.g. multi-storey
    • F27B1/04—Combinations or arrangements of shafts
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/08—Shaft or like vertical or substantially vertical furnaces heated otherwise than by solid fuel mixed with charge
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/16—Arrangements of tuyeres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F27D17/18—Arrangements for using waste heat for preheating solid materials

Definitions

  • the present invention relates to a method for calcining carbonated mineral stones in a parallel flow regenerative kiln (PFRK).
  • PFRK parallel flow regenerative kiln
  • Such a kiln comprises at least two shafts interconnected by means of a crossover channel.
  • the stones are introduced in a top portion and follow a downward gravity displacement during which the stones are successively preheated, calcined and thereafter cooled in order to be collected in a low portion of each shaft.
  • a Parallel Flow Regenerative Kiln has usually 2 to 3 shafts, circular or rectangular, which do not work in a continuous way.
  • a fuel is injected inside a calcining zone of one shaft by means of lances and is burned in presence of combustion air. Thereafter the descending calcined product is cooled in a cooling zone by heat exchange with a cooling air introduced at the bottom of the shaft.
  • the flue gas consists in the combustion gas, the gas of decarbonation and the heated cooling air. This flue gas is drawn into another shaft through the crossover channel and thereafter through the stones present in this shaft and thereafter outward the kiln. So, in this shaft the present stones are preheated by the exiting flue gas.
  • the shaft wherein the combustion takes place works according to a calcining way and the shaft wherein the flue gas is drawn through the stones works according to a preheating way.
  • inversion period which is provided for reverting the air and fuel circuits.
  • the shaft having worked in a calcining way works now in a preheating way and the shaft having worked in a preheating way works now in a calcining way.
  • the classical method for calcining carbonated mineral stones in a parallel flow regenerative kiln having at least two shafts interconnected by a crossover channel comprises, in standard operation,
  • the stones introduced into the kiln are at ambient temperature and the flue gas drawn outside the kiln is at about 150°C, limiting the energy losses.
  • standard operation means that the kiln produces the calcined material in a continuous manner. This operation does not concern the phases of starting, stopping or maintenance of the kiln.
  • carbonated mineral stones particularly mean calcareous stones (limestones), dolomitic stones (dolostones or unburnt dolomites) and/or magnesite stones which are calcined in quicklime, quick dolime and/or magnesia.
  • the injection system of the kiln of the invention is optimized to get a good heat distribution with no preferential flow of the heated gas in the periphery of the shaft. So, the quality of the calcined material is widely improved.
  • each shaft has a rectangular section, a side of one shaft facing a side of another shaft, the crossover channel interconnecting directly the shafts between said facing sides.
  • said means for removing heated cooling air from the kiln comprise on at least some sides of each shaft at least one collector which communicates with an external extracting device.
  • the gaseous stream introduced into the crossover channel is heated by a separate heating device to the adjusted temperature lower than said temperature allowing a calcining of the carbonated mineral stones but higher than the temperature of recarbonation of the calcined mineral stones.
  • At least one heat exchanger supplied with heated cooling air extracted from the kiln is arranged on said external recirculation circuit.
  • the carbonated stones are introduced at the top of the shafts by means of an entrance opening 5 which is in open position. By gravity the stones gradually descend in the shaft.
  • a gas having a temperature equal or higher than the calcination temperature of the stones are provided in service, i.e. a gas temperature of 900 to 1600°C, preferably of 1100 to 1400°C.
  • each circular shaft is also equipped with an annular collector 24 which communicates also with said extracting device 23.
  • At least one heat exchanger supplied with heated cooling air extracted from the kiln is advantageously arranged on said external recirculation circuit 18.
  • the heated cooling air drawn by the extracting device 23 is supplied to a heat exchanger 25 wherein a heat exchange takes place with the cold gas exiting from the treatment unit 19. Air at a temperature close to the ambient temperature is so released in the atmosphere by the outlet 26 and there is an energy recovering upstream of the heating device 20.
  • the kiln on Fig.1 comprises also means for advantageously injecting a heated gas 27 into the crossover channel 4.
  • This gas is supplied from a mixing chamber 33 which is connected to the recirculation circuit 18 downward the heating device 20 in order to collect a first part of said recirculated fraction of gaseous effluent which has been heated and to a separating body 34 which is arranged on the recirculation circuit 18 upwards the heating device 20 and is able to transfer to the mixing chamber 33 a second part of said recirculated fraction of gaseous effluent which has not been heated by said heating device.
  • a gaseous mixture having an adjusted temperature in the range of 900 to 1100°C, higher than the temperature of recarbonation of the calcined mineral stones but lower than a temperature allowing a calcining of the carbonated mineral stones being advantageously of 1100 to 1400°C, is obtained and may be injected by the connection 27 into the crossover channel 4 for compensating the extraction of the heated cooling air from the kiln.
  • the gaseous mixture having an adjusted temperature in the range of 900 to 1100°C to be injected in the crossover channel 4 is generated by a separate heating device, heating to the range of 900 to 1100°C the second part of said recirculated fraction of gaseous effluent which has not been heated by said heating device 20, to directly be injected by the connection 27 into the crossover channel.
  • a separate heating device heating to the range of 900 to 1100°C the second part of said recirculated fraction of gaseous effluent which has not been heated by said heating device 20, to directly be injected by the connection 27 into the crossover channel.
  • the gaseous stream entering the shaft 2 consists almost only in the CO 2 released during the decarbonation in shaft 1, the heated gas injected inside the shaft 1 at the top of the calcining zone B by the means 6 and 7 and the heated gas injected inside the crossover channel by the means 27.
  • This gaseous stream is no more diluted by air, excepted possibly by a little bit false air/cooling air not being extracted. Effectively there is no more need of air for any combustion and the cooling air is extracted from the kiln. Consequently, the CO 2 content of the gaseous effluent exiting from the kiln is highly concentrated.
  • the kiln illustrated on Fig.2 differs from the kiln of Fig.1 by the means for injecting a heated gas and the means for extracting the heated cooling air.
  • Each shaft comprises an inner cylinder 28 which extends axially from the top to the bottom and which is divided in three separated parts, an upper part 29 which is connected with the heating device and is provided with perforations 30 at the top of the calcining zone and a lower part 31which is connected with the external extracting device 23 and is provided with holes at the top of the cooling zone.
  • a central part 32 separates the upper and the lower parts in order they have no communication between them.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Furnace Details (AREA)
EP22217327.0A 2022-12-30 2022-12-30 Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen Withdrawn EP4394298A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP22217327.0A EP4394298A1 (de) 2022-12-30 2022-12-30 Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen
EP23841226.6A EP4643070A1 (de) 2022-12-30 2023-12-28 Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen
PCT/EP2023/087892 WO2024141579A1 (en) 2022-12-30 2023-12-28 Method for calcining carbonated mineral stones in a parallel flow regenerative kiln and implemented kiln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22217327.0A EP4394298A1 (de) 2022-12-30 2022-12-30 Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen

Publications (1)

Publication Number Publication Date
EP4394298A1 true EP4394298A1 (de) 2024-07-03

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Application Number Title Priority Date Filing Date
EP22217327.0A Withdrawn EP4394298A1 (de) 2022-12-30 2022-12-30 Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen
EP23841226.6A Pending EP4643070A1 (de) 2022-12-30 2023-12-28 Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP23841226.6A Pending EP4643070A1 (de) 2022-12-30 2023-12-28 Verfahren zum kalzinieren von karbonisierten mineralsteinen in einem regenerativen ofen mit parallelem fluss und implementierter ofen

Country Status (2)

Country Link
EP (2) EP4394298A1 (de)
WO (1) WO2024141579A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3145549A1 (de) * 1981-11-17 1983-06-01 Wärmestelle Steine und Erden GmbH, 4000 Düsseldorf Schachtofen zum brennen und sintern von stueckigem gut mit umwaelzgasabsaugung
WO2022002869A1 (fr) * 2020-07-03 2022-01-06 S.A. Lhoist Recherche Et Developpement Procédé de calcination de roche minérale dans un four droit vertical à flux parallèles régénératif et four mis en oeuvre
DE102021204175A1 (de) * 2021-04-27 2022-10-27 Maerz Ofenbau Ag Kalkofensystem zum Brennen von Karbonatgestein und Verfahren zum Umbau eines GGR-Schachtofens in ein Kalkofensystem mit einem Schachtofen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022229120A1 (de) 2021-04-27 2022-11-03 Maerz Ofenbau Ag Kalkofensystem zum brennen von karbonatgestein und verfahren zum umbau eines ggr-schachtofens in ein kalkofensystem mit einem schachtofen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3145549A1 (de) * 1981-11-17 1983-06-01 Wärmestelle Steine und Erden GmbH, 4000 Düsseldorf Schachtofen zum brennen und sintern von stueckigem gut mit umwaelzgasabsaugung
WO2022002869A1 (fr) * 2020-07-03 2022-01-06 S.A. Lhoist Recherche Et Developpement Procédé de calcination de roche minérale dans un four droit vertical à flux parallèles régénératif et four mis en oeuvre
DE102021204175A1 (de) * 2021-04-27 2022-10-27 Maerz Ofenbau Ag Kalkofensystem zum Brennen von Karbonatgestein und Verfahren zum Umbau eines GGR-Schachtofens in ein Kalkofensystem mit einem Schachtofen

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Publication number Publication date
WO2024141579A1 (en) 2024-07-04
EP4643070A1 (de) 2025-11-05

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