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WO1987007591A1 - Procede de preparation d'un bain de fusion pour la production de laine minerale et four a cuve permettant de realiser ledit procede - Google Patents

Procede de preparation d'un bain de fusion pour la production de laine minerale et four a cuve permettant de realiser ledit procede Download PDF

Info

Publication number
WO1987007591A1
WO1987007591A1 PCT/DK1987/000069 DK8700069W WO8707591A1 WO 1987007591 A1 WO1987007591 A1 WO 1987007591A1 DK 8700069 W DK8700069 W DK 8700069W WO 8707591 A1 WO8707591 A1 WO 8707591A1
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
melt
shaft furnace
oxygen
furnace chamber
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.)
Ceased
Application number
PCT/DK1987/000069
Other languages
English (en)
Inventor
Leif Møller JENSEN
Jens Kristian Gamborg Hansen
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.)
Rockwool AS
Original Assignee
Rockwool International AS
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 Rockwool International AS filed Critical Rockwool International AS
Priority to FI880540A priority Critical patent/FI880540A7/fi
Publication of WO1987007591A1 publication Critical patent/WO1987007591A1/fr
Priority to DK055588A priority patent/DK55588D0/da
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B3/00—Charging the melting furnaces
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/12—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in shaft furnaces
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/235—Heating the glass
    • C03B5/2353—Heating the glass by combustion with pure oxygen or oxygen-enriched air, e.g. using oxy-fuel burners or oxygen lances
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/235—Heating the glass
    • C03B5/2356—Submerged heating, e.g. by using heat pipes, hot gas or submerged combustion burners
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B3/00—Charging the melting furnaces
    • C03B3/02—Charging the melting furnaces combined with preheating, premelting or pretreating the glass-making ingredients, pellets or cullet
    • C03B3/026—Charging the melting furnaces combined with preheating, premelting or pretreating the glass-making ingredients, pellets or cullet by charging the ingredients into a flame, through a burner or equivalent heating means used to heat the melting furnace
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/005—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture of glass-forming waste materials
    • 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
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping

Definitions

  • the present invention relates to a method of preparing a melt for the production of mineral wool wherein a raw material having a composition suitable for the preparation of the melt and a carbonaceous material are introduced into the upper portion of a shaft furnace and oxygen-containing gas is introduced into the lower portion of the shaft furnace to effect a combustion of the carbonaceous material and to melt the raw material, and wherein a melt is discharged from the bottom of the shaft furnace.
  • the carbonaceous material used typically consists of coke and the oxygen- containing gas is normally oxygen-enriched air which is suitably preheated to a temperature of about 500°C.
  • a known type of shaft furnace for the preparation of a melt for the production of mineral wool is a cupola furnace. Such a furnace normally comprises four zones i.e. a melting bath, an oxidation zone, a reduction zone, and a preheating zone.
  • the lower portion of the cupola constitutes the melting bath and comprises the melt formed in the cupola which melt is located in the space between the pieces of coke which are resting on the bottom of the cupola and which support the located thereabove.
  • the temperature in the melting bath is typically in the range of 1500-1550°C.
  • the oxidation zone is located above the melting bath and the Tower portion of said zone is provided with air intake nozzles, the so-called tuyeres, through which the preheated air is introduced into the furnace.
  • the actual combustion of coke takes place during the movement of the preheated air up through the oxidation zone, and the gas temperature rises from about 500°C to about 2000°C thus causing the material which moves down through the oxidation zone to be heated as a result of the melting of the raw material.
  • the melt formed flows down into the melting bath where the temperature, as mentioned, typically is 1500-1550°C.
  • the vertical extension of the oxidation zone is determined by the amount of oxygen introduced as the reduction zone starts at the level where the oxygen introduced through the tuyeres has been consumed for the combustion of coke.
  • the quality of the mineral fibres prepared from the melt is determined to a significant degree by the viscosity of the melt. As the viscosity i.a. depends on the temperature of the melt, it is essential that the temperature of
  • a further drawback of the known methods is that an increase in the coke percentage in addition to reducing the melting capacity results in increased amounts of smoke gas which may cause environmental problems, especially in connection with the use of sulphurous coke.
  • This reaction is heat consuming and causes 20-25% of the energy released by the combustion in the oxidation zone to be lost as latent heat in the smoke gas, when the CO-content is 6-10%. Even though this amount of heat may be recovered in a secondary combustion, it will be desirable to avoid the formation of CO i.a. because a secondary combustion requires relatively high plant investments, and the efficiency of such a secondary combustion is relatively low.
  • the reduction i.e. the formation of CO
  • the reaction rate for the conversion of C0 2 into CO is so low at temperatures below 1000°C that no appreciable reduction takes places in the preheating zone located above the reduction zone wherein the materials introduced at the top of the furnace are heated from the ambient temperature to about 1000°C.
  • the object of the invention is to avoid the above mentioned drawbacks of the prior art methods of the type defined above.
  • a further advantage of the method according to the invention is that it permits a reduction of the coke percent so as to improve the melting capacity and reduce the sulphur emission.
  • a reduction of the coke percent makes it possible to limit the introduction of oxygen-containing air through the tuyeres and thus to reduce the amount Of smoke gas.
  • a particularly efficient way of maintaining the temperature at the desired level consists in introducing a solid particulate material in admixture with oxygen and fuel. By varying the amount of such a material it is thus possible to change the temperature in the zone in which said mixture is introduced and combusted.
  • the waste material is normally introduced in the form of preformed briquettes.
  • the solid particulate material may also be an agent for quickly changing the properties of the melt, such as a way of changing the viscosity of the melt.
  • An example of such an agent is calcium oxide.
  • the above mentioned mixture of oxygen and fuel preferably consists of pure oxygen and a hydrocarbon, and the amounts of the two components should normally be adjusted so as to obtain a complete combustion of the fuel component.
  • pure oxygen mixtures of oxygen and other gasses may be used, e.g. atmospheric air, and the fuel component may consist of other carbonaceous materials than hydrocarbon, such as coal dust and/or oil vapour.
  • the mixture of oxygen and fuel are introduced into the central portion of the furnace through a pipe extending parallel with the longitudinal axis of the furnace so as to avoid an unfavourable effect on the.movement of the raw material and coke down through the furnace chamber.
  • the invention also relates to a shaft furnace for carrying out the method described above.
  • the shaft furnace according to the invention comprises a cylindrical, essentially vertically mounted furnace chamber surrounded by a furnace wall in which there are mounted tuyeres for introducing oxygen-containing gas into the furnace chamber, means for introducing a fusible raw material and carbonaceous material into the upper end of the furnace chamber, and means for discharging melt at the lower end of the furnace chamber, and the furnace is characterized in that it additionally comprises a burner pipe for introducing and combusting a mixture of oxygen and fuel in the central portion of the furnace chamber.
  • the burner pipe extends parallel with the longitudinal axis of the furnace chamber in order, as previously mentioned, not to obstruct the movement of the raw material and coke down through the furnace chamber.
  • the burner pipe is preferably placed in such a manner that it extends down into the furnace chamber from its top.
  • the lenght of the portion of the burner pipe located in the furnace chamber is preferably adjustable so as to obtain the possibility of concentrating the heat development at a desired level in the furnace chamber and thus to obtain a desired temperature distribution.
  • the burner pipe which may be provided with cooling devices preferably comprises separate passages for supplying oxygen and fuel to the free end of the pipe.
  • tiie pipe may be provided with devices for introducing fine waste material into the furnace chamber.
  • Fig. 1 shows a vertical cross-sectional view of a shaft furnace according to the invention
  • Fig. 2 shows a perspective view of a burner pipe for use in a shaft furnace according to the invention.
  • the shaft furnace shown in the drawings comprises a cylindrical furnace chamber 1 surrounded by a water-cooled furnace wall 2.
  • a feed hopper 3 which communicates with a feed vessel 4 having a bottom which is formed by an axially displaceable cwie 5.
  • a feed vessel 4 having a bottom which is formed by an axially displaceable cwie 5.
  • an outlet 6 for smoke gasses.
  • the shaft furnace has a plane bottom 7 and in a suitable distance above the bottom 7 there is provided a melt outlet 8.
  • a number of tuyeres 9 communicating with an annular air inlet pipe 10 is mounted in the furnace wall some distance above the level of the melt outlet 8.
  • the furnace also comprises a burner pipe 11 extending down through the feed vessel 4 and terminating in the lower portion of the furnace chamber.
  • the burner pipe is provided with a cooling jacket having a pipe stub 12 for the supply of cooling medium and a further pipe stub 13 for the discharge of spent cooling medium.
  • the position of the lower end of the burner pipe 11 in the furnace chamber is adjustable, the burner pipe 11 being connected with mechanical or hydraulic 0 devices (not shown) for longitudinally displacing the burner pipe 11.
  • the burner pipe shown in Fig. 2 comprises three more stubs 14, 15, and 16, the pipe stubs 14 and 15 serving to introduce oxygen and fuel respectively and the pipe stub
  • the raw material for preparing the desired melt and coke are introduced into the shaft furnace through the feed hopper 3 and may be introduced in the actual furnace chamber after the cone 5 has been displaced from the closing position.
  • said materials reach the 5 preheating zone of the furnace in which they are preheated by the ascending smoke gasses.
  • the melting of the raw material in the lower portion of the furnace and the collection of the melt on the bottom of the furnace from which it is discharged through the outlet 8 takes place concurrently with the descend of the preheated materials down 0 through the furnace chamber 1 and their entry into the oxidation zone of the furnace.
  • the materials are heated partly by the heat produced by the combustion of coke and partly by the combustion of fuel introduced through the burner pipe 11.
  • the burner pipe may e.g.
  • the supply of said mixture may optionally be controlled automatically as a function of the temperature of the melt formed in the furnace. During normal operation about 50% of the heat may derive from the combustion of coke and the remaining 50% from the combustion of the mixture of 5 oxygen and fuel introduced through the burner pipe.
  • the burner pipe shown in Fig. 2 it is possible to introduce fine waste material through the central passage 19 of the ⁇ ° burner pipe 11 concurrently with the introduction of a mixture of oxygen and fuel.
  • the possibility is obtained of reusing said material without adversely affecting the movement of the smoke gasses up through the furnace.
  • the burner pipe 11 may optionally be used to burn away carbon which shows a tendency to '5 accumulate in the lower portion of the furnace and to form a coating on the bottom of the furnace.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Glass Compositions (AREA)

Abstract

Un procédé de préparation d'un bain de fusion pour la production de laine minérale consiste à chauffer le matériau brut pour la fonte dans un four à cuve par combustion de coke, tout en introduisant de l'air contenant de l'oxygène à travers les tuyères du four à cuve, et à obtenir une partie de la chaleur nécessaire par l'introduction et la combustion d'un mélange d'oxygène et de combustible dans la partie centrale du four à cuve. Un four à cuve permettant de réaliser ledit procédé comprend un tuyau de brûleur permettant d'introduire et de brûler un mélange d'oxygène et de combustible dans la partie centrale de la chambre du four.
PCT/DK1987/000069 1986-06-06 1987-06-04 Procede de preparation d'un bain de fusion pour la production de laine minerale et four a cuve permettant de realiser ledit procede Ceased WO1987007591A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI880540A FI880540A7 (fi) 1986-06-06 1987-06-04 Sulan valmistusmenetelmä mineraalivillan tuotantoa varten ja kuilu-uu ni tämän menetelmän toteuttamiseksi.
DK055588A DK55588D0 (da) 1986-06-06 1988-02-03 Fremgangsmaade ved fremstilling af en smelte til dannelse a mineraluld og skaktovn til udoevelse af fremgangsmaaden

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK267186A DK267186D0 (da) 1986-06-06 1986-06-06 Mineraluldsfremstilling
DK2671/86 1986-06-06

Publications (1)

Publication Number Publication Date
WO1987007591A1 true WO1987007591A1 (fr) 1987-12-17

Family

ID=8114473

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1987/000069 Ceased WO1987007591A1 (fr) 1986-06-06 1987-06-04 Procede de preparation d'un bain de fusion pour la production de laine minerale et four a cuve permettant de realiser ledit procede

Country Status (4)

Country Link
EP (1) EP0269704A1 (fr)
DK (1) DK267186D0 (fr)
FI (1) FI880540A7 (fr)
WO (1) WO1987007591A1 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0312044A1 (fr) * 1987-10-15 1989-04-19 Rockwool International A/S Procédé et four de préparation d'une masse en fusion pour la production de laine minérale
WO1990012761A1 (fr) * 1989-04-17 1990-11-01 Rockwool International A/S Four vertical
EP0896955A1 (fr) * 1997-08-12 1999-02-17 Von Roll Umwelttechnik AG Procédé et appareil pour la réduction d'un métal dans un bain de fusion de verre ou de scories
WO1999028248A1 (fr) * 1997-12-02 1999-06-10 Rockwool International A/S Procede de production de fibres vitreuses
WO1999028249A1 (fr) * 1997-12-02 1999-06-10 Rockwool International A/S Procede et dispositif de production de fibres vitreuses
WO1999050196A1 (fr) * 1998-03-27 1999-10-07 Paroc Oy Ab Procede de fusion de materiaux rocheux pour la production de fibres minerales
WO2002046110A3 (fr) * 2000-12-07 2002-12-05 Messer Griesheim Gmbh Dispositif et procede de fusion de verre
DE102007050132A1 (de) 2007-10-19 2009-04-23 Deutsche Rockwool Mineralwoll Gmbh + Co Ohg Düsenimplantat für Kupol- oder Schachtöfen
WO2015014918A1 (fr) * 2013-07-31 2015-02-05 Knauf Insulation Procédé de fabrication d'un matériau vitrifié par fusion
WO2015014919A1 (fr) * 2013-07-31 2015-02-05 Knauf Insulation Compartiment de fusion comprenant un brûleur à combustion immergé, procédé faisant appel au brûleur et utilisation du brûleur
EP2788295A4 (fr) * 2011-12-08 2015-08-12 Nat University Of Science And Technology Misis Procédé de fusion du verre et four de fusion du verre impliquant un barbotage à travers une couche de verre fondu
EP3260429A1 (fr) * 2016-06-22 2017-12-27 Johns Manville Décharge efficace des gaz d'échappement à partir de fusion à combustion immergée et procédés
US9878932B2 (en) 2013-07-31 2018-01-30 Knauf Insulation Submerged combustion melters and methods
US10336640B2 (en) 2013-07-31 2019-07-02 Knauf Insulation Method and apparatus for melting solid raw batch material using submerged combustion burners
US20220185714A1 (en) * 2015-01-27 2022-06-16 Knauf Insulation Process for the preparation of a silica melt

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451582A (en) * 1941-09-09 1948-10-19 American Rock Wool Corp Apparatus for producing mineral wool
US3701517A (en) * 1966-12-16 1972-10-31 Airco Inc Oxy-fuel burners in furnace tuyeres
SE386660B (sv) * 1973-06-18 1976-08-16 Rockwool Ab Forfarande for smeltning i schaktugn samt schaktugn for utovande av forfarandet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451582A (en) * 1941-09-09 1948-10-19 American Rock Wool Corp Apparatus for producing mineral wool
US3701517A (en) * 1966-12-16 1972-10-31 Airco Inc Oxy-fuel burners in furnace tuyeres
SE386660B (sv) * 1973-06-18 1976-08-16 Rockwool Ab Forfarande for smeltning i schaktugn samt schaktugn for utovande av forfarandet

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0312044A1 (fr) * 1987-10-15 1989-04-19 Rockwool International A/S Procédé et four de préparation d'une masse en fusion pour la production de laine minérale
WO1990012761A1 (fr) * 1989-04-17 1990-11-01 Rockwool International A/S Four vertical
EP0896955A1 (fr) * 1997-08-12 1999-02-17 Von Roll Umwelttechnik AG Procédé et appareil pour la réduction d'un métal dans un bain de fusion de verre ou de scories
WO1999028248A1 (fr) * 1997-12-02 1999-06-10 Rockwool International A/S Procede de production de fibres vitreuses
WO1999028249A1 (fr) * 1997-12-02 1999-06-10 Rockwool International A/S Procede et dispositif de production de fibres vitreuses
WO1999028250A1 (fr) * 1997-12-02 1999-06-10 Rockwool International A/S Production de fibres vitreuses
WO1999050196A1 (fr) * 1998-03-27 1999-10-07 Paroc Oy Ab Procede de fusion de materiaux rocheux pour la production de fibres minerales
WO2002046110A3 (fr) * 2000-12-07 2002-12-05 Messer Griesheim Gmbh Dispositif et procede de fusion de verre
DE102007050132A1 (de) 2007-10-19 2009-04-23 Deutsche Rockwool Mineralwoll Gmbh + Co Ohg Düsenimplantat für Kupol- oder Schachtöfen
EP2788295A4 (fr) * 2011-12-08 2015-08-12 Nat University Of Science And Technology Misis Procédé de fusion du verre et four de fusion du verre impliquant un barbotage à travers une couche de verre fondu
WO2015014919A1 (fr) * 2013-07-31 2015-02-05 Knauf Insulation Compartiment de fusion comprenant un brûleur à combustion immergé, procédé faisant appel au brûleur et utilisation du brûleur
WO2015014918A1 (fr) * 2013-07-31 2015-02-05 Knauf Insulation Procédé de fabrication d'un matériau vitrifié par fusion
US9878932B2 (en) 2013-07-31 2018-01-30 Knauf Insulation Submerged combustion melters and methods
AU2014298468B2 (en) * 2013-07-31 2018-06-07 Knauf Insulation Process for manufacturing vitrified material by melting
US10011510B2 (en) 2013-07-31 2018-07-03 Knauf Insulation Melter having a submerged combustion burner, method using the burner and use of the burner
US10336640B2 (en) 2013-07-31 2019-07-02 Knauf Insulation Method and apparatus for melting solid raw batch material using submerged combustion burners
US10494286B2 (en) 2013-07-31 2019-12-03 Knauf Insulation Process for manufacturing vitrified material by melting
US20220185714A1 (en) * 2015-01-27 2022-06-16 Knauf Insulation Process for the preparation of a silica melt
EP3260429A1 (fr) * 2016-06-22 2017-12-27 Johns Manville Décharge efficace des gaz d'échappement à partir de fusion à combustion immergée et procédés
US10246362B2 (en) 2016-06-22 2019-04-02 Johns Manville Effective discharge of exhaust from submerged combustion melters and methods
US10793459B2 (en) 2016-06-22 2020-10-06 Johns Manville Effective discharge of exhaust from submerged combustion melters and methods

Also Published As

Publication number Publication date
DK267186D0 (da) 1986-06-06
FI880540L (fi) 1988-02-05
FI880540A0 (fi) 1988-02-05
FI880540A7 (fi) 1988-02-05
EP0269704A1 (fr) 1988-06-08

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