WO2009052894A1 - Agencement de buses pour cubilots ou fours à cuve - Google Patents

Agencement de buses pour cubilots ou fours à cuve Download PDF

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Publication number
WO2009052894A1
WO2009052894A1 PCT/EP2008/007249 EP2008007249W WO2009052894A1 WO 2009052894 A1 WO2009052894 A1 WO 2009052894A1 EP 2008007249 W EP2008007249 W EP 2008007249W WO 2009052894 A1 WO2009052894 A1 WO 2009052894A1
Authority
WO
WIPO (PCT)
Prior art keywords
cupola
nozzle
furnace body
combustion air
shaft furnace
Prior art date
Application number
PCT/EP2008/007249
Other languages
German (de)
English (en)
Inventor
Guido Nykiel
Miguel Gonzales Caparros
Original Assignee
Deutsche Rockwool Mineralwoll Gmbh & Co.Ohg
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 Deutsche Rockwool Mineralwoll Gmbh & Co.Ohg filed Critical Deutsche Rockwool Mineralwoll Gmbh & Co.Ohg
Priority to EP08801844A priority Critical patent/EP2210053A1/fr
Publication of WO2009052894A1 publication Critical patent/WO2009052894A1/fr

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B11/00—Making pig-iron other than in blast furnaces
    • C21B11/02—Making pig-iron other than in blast furnaces in low shaft furnaces or shaft furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • 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 peculiar to furnaces of these types
    • F27B1/16—Arrangements of tuyeres

Definitions

  • the present patent application relates to a nozzle implant for a cupola or shaft furnace, in particular for the production of mineral melts in mineral fiber production.
  • the coarse-grained starting products such as rocks and aggregates are filled together with a coarse-grained fuel in the formed as a shaft or cupola melting unit.
  • a coarse-grained fuel in the formed as a shaft or cupola melting unit.
  • the furnace temperature reaches a level at which the introduced coarse-grained rocks and aggregates melt.
  • the temperature in the furnace decreases in an upward direction, since the heat energy is released to the raw materials and the fuel serving as the energy carrier.
  • the oxygen concentration drops to almost zero.
  • the liquid phase formed in the melting zone sinks to the bottom of the melting aggregate.
  • segregation phenomena subsequently occur in which the iron reduced from the rock accumulates at the lowest point of the smelting aggregate and the melt required for mineral fiber extraction, due to its lower specific weight, discharges above the bottom via an outlet arranged there leaves.
  • the resulting molten iron is discharged via a arranged at the bottom of the melter opening as needed.
  • the resulting in the combustion process in the molten zone near the air inlet exhaust gases consist mainly of carbon dioxide, nitrogen dioxide and carbon monoxide.
  • these gases, but especially the carbon dioxide react with the carbon of the raw material / fuel column above the melting zone. It comes on the hot surfaces of the carbonaceous fuel to a strong endothermic reduction reaction in which the carbon dioxide reacts with the carbon in a Boudouard reaction to carbon monoxide. Energy is consumed by this undesirable reduction reaction, which adversely affects the heat balance of the melter. The energy losses resulting from such reactions are usually up to 20% of the total energy input.
  • the melting zone Due to the penetration-induced penetration depth of the air inlet called primary wind flow, the melting zone is not uniformly distributed over the entire base area. In many cases, only a small penetration depth of the primary wind is observed. This is the case in particular with shaft or cupola furnaces with large shaft diameters.
  • the melting capacity of the melting unit is directly dependent on the amount of air introduced as the amount of wind. Frequently, a superstoichiometric amount of wind is supplied at the required maximum melting rate, so that the melting unit is over-blown. Although the output power is increased by the increased amount of wind, this is often associated with a lowering of the melting temperature, which must be adjusted again by a higher fuel addition. This, in turn, is at the expense of melting performance.
  • the dead man formed in the middle of the shaft of the smelting unit is usually not reached despite the maximum amount of wind, so that the supply of oxygen in the zone of heavy fuel burns is unnecessarily high. The melting unit is overblown.
  • Melting units have an optimum operating point, in which the optimum amount of wind, depending on the area at the nozzle level, ie in the area of the wind supply, ensures maximum throughput with the lowest possible use of fuel and maximum melting temperature.
  • the optimum operating point of a smelting unit could be extended to a much wider window if the dead man's zone were to be reached with atmospheric oxygen necessary for combustion.
  • German Offenlegungsschrift 1 526 099 discloses that even in furnaces for burning sludge with larger cross sections than the penetration depth of the air, the combustion in the furnace center ceases. To overcome this problem, DE 1 526 099 describes a height-adjustable tube introduced from above in the center of the furnace or laterally introduced nozzle rods at the level of the primary wind nozzle plane.
  • WO 03/006389 also describes the problem of "dead man formation.” To solve this problem, WO 03/006389 proposes to allow radially arranged, movable nozzles to protrude deeper into the melting unit center Melting units with relatively small diameters feasible.
  • a Kupol- or shaft furnace for producing a melt, in particular for mineral fiber extraction, comprising a furnace body, a primary wind ring with at least one attached blow mold for blowing combustion air into the cupola or shaft furnace, and a means for introduction of combustion air in the formed in the region of the shaft center of the furnace low-reaction zone, which is characterized in that the means for introducing combustion air into the In the region of the shaft center of the furnace formed low-reaction zone is introduced from below into the furnace nozzle lance or arranged in the furnace nozzle beam, which are connected to a wind line.
  • the means for introducing combustion air in the formed in the region of the shaft center of the furnace low-reaction zone is connected to the primary wind ring.
  • such a device for introducing combustion air consists of a refractory concrete, which has a sufficient thermal, chemical and mechanical stability against the conditions prevailing in the cupola or shaft furnace at the time of melt production process conditions.
  • At the nozzle lance at least one outlet nozzle is provided in the region of the upper end of the lance.
  • a nozzle is aligned at an angle between 0 ° and 90 ° to the furnace center axis. In this way, a wind guide is made possible, which is able to avoid the greatest possible avoidance of the dead areas in the center of the shaft of the smelting unit.
  • the cupola or shaft furnace at least two substantially oppositely arranged blow molds for blowing combustion air into the cupola or shaft furnace, wherein the means for introducing combustion air into the formed in the region of the shaft center of the furnace low-reaction zone a nozzle bar is, which rests on the blow molds.
  • the nozzle bar can be connected via the serving as a support blow molds to the primary wind ring and acted upon by wind.
  • An inventive nozzle bar has a plurality of nozzles distributed over the nozzle bars.
  • the nozzles provided in the nozzle lance or the nozzle beam according to the invention are advantageously formed from a high-temperature-resistant ceramic, preferably based on zinc oxide.
  • a water cooling has been shown as a suitable cooling device.
  • the nozzle lance or the nozzle beam can be provided in this corresponding coolant lines through which cooling water can be performed.
  • the applied wind is advantageously already preheated in the nozzle bar or the nozzle lances and flows as a hot blast in the low-reaction zone of the melting unit.
  • the air additionally acted upon by the nozzle lance or the nozzle bar is preheated to a temperature of up to 650 0 C. It has been found that up to 50% of the air fed in via the primary wind nozzles can be acted upon by the nozzle lance or the nozzle beam provided according to the invention.
  • Fig. 1 shows an inventively introduced from below into a melting unit nozzle lance or central nozzle.
  • FIG. 2 shows a nozzle bar provided according to the invention in a melting unit.
  • Fig. 3 shows the situation according to the prior art.
  • Fig. 1 shows a cupola 1 with a cupola lid 9 arranged at the bottom, in which a central nozzle 6 is arranged through a pipe opening.
  • the cupola 1 has in the region of its wall and its bottom above the Kupolofendeckels 9 a refractory lining 5 or insulating stones.
  • the Kupolofendeckel 9 is sealed with respect to the central nozzle 6 with a refractory material, so that neither melt nor liquid iron can escape from the tube breakthrough.
  • the central nozzle 6 is made of a special refractory concrete which withstands the thermal, chemical and mechanical stresses during the smelting campaign.
  • the central nozzle 6 is equipped with one or more outlet nozzles, which are arranged horizontally, preferably diagonally upwards.
  • the plane of the outlet nozzles is located at the level of primary wind nozzles or blow molds 3 or is arranged slightly above this level.
  • the primary wind nozzles or blow molds 3 are connected to a primary wind ring 2.
  • a vertically upward arrangement of the outlet nozzles is advantageous, but there is a risk that flowing down melt and / or iron flowing down the outlet nozzles added.
  • the outlet nozzles are made of high temperature resistant material, eg. Zirconium oxide.
  • the central nozzle 6 inserted from below into the cupola lid 9 can be subjected to additional wind separately from the primary wind.
  • the additional wind can be enriched with oxygen.
  • the outlet nozzles are designed in number and in diameter so that 5 to 50%, preferably 10%, of the primary wind can be added via the central nozzle 6 as an additional wind.
  • an expanded zone 7 of strong coke combustion is formed.
  • the central nozzle 6 inserted from below falls out together with the remaining furnace filling.
  • the central nozzle 6 inserted from below may possibly be used over several melting campaigns.
  • Fig. 2 shows an alternative embodiment of a cupola 1 with a nozzle bar 8, which consists of a refractory concrete mass and is supported on two opposite blow molds 3, through which the nozzle bar 8 refers additional air.
  • the outlet nozzle having nozzle bar 8 is connected to the existing primary wind ring 2 and thus involved.
  • the flow rate can be determined via the selected cross-section and the number of outlet nozzles, which depends on the primary wind volume flow and the resulting pressure resistance of the system.
  • the outlet nozzles of the nozzle beam 8 are made of a high temperature resistant ceramic, z. Zirconium oxide.
  • the nozzle bar 8 is designed so that the filling of the empty furnace, the component is not destroyed. As with the central nozzle 6 used from below or above, the use of hot blast is advantageous. Further improvement can be achieved by additional oxygenation. Above the nozzle bar 8, a zone 7 strong coke combustion is formed.
  • Fig. 3 shows a cupola 1 according to the prior art and therefore without the inventively provided means for introducing combustion air in the formed in the region of the shaft center of the furnace low-reaction zone.
  • 3 combustion air is introduced into the cupola 1 only via the ring connected to the primary wind 2 blow molds. This creates zones of heavy fuel conversion 4. Signed nl iste

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention concerne un cubilot ou un four à cuve (1) destiné à la production d'une fonte, en particulier à la fabrication de produits à base de fibres minérales. Pour éviter les zones à faible réaction au milieu du corps du four, il est prévu d'introduire de l'air de combustion au moyen d'une buse (6) insérée dans le bas du four ou d'une rampe de buses (8) montée dans le corps du four.
PCT/EP2008/007249 2007-10-19 2008-09-05 Agencement de buses pour cubilots ou fours à cuve WO2009052894A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08801844A EP2210053A1 (fr) 2007-10-19 2008-09-05 Agencement de buses pour cubilots ou fours à cuve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007050132.5 2007-10-19
DE102007050132A DE102007050132A1 (de) 2007-10-19 2007-10-19 Düsenimplantat für Kupol- oder Schachtöfen

Publications (1)

Publication Number Publication Date
WO2009052894A1 true WO2009052894A1 (fr) 2009-04-30

Family

ID=40019068

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/007249 WO2009052894A1 (fr) 2007-10-19 2008-09-05 Agencement de buses pour cubilots ou fours à cuve

Country Status (3)

Country Link
EP (1) EP2210053A1 (fr)
DE (1) DE102007050132A1 (fr)
WO (1) WO2009052894A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1203754A2 (fr) * 2000-11-01 2002-05-08 L'air Liquide, S.A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude Procédé et four vertical pour la production des billes de verre
JP2004101178A (ja) * 2003-10-27 2004-04-02 Tokyo Elex Kk 溶融炉
FR2873682A1 (fr) * 2004-07-29 2006-02-03 Saint Gobain Isover Sa Procede et dispositif de traitement de dechets fibreux en vue de leur recyclage
WO2008052692A1 (fr) * 2006-11-02 2008-05-08 Rockwool International A/S Procédé et appareil pour la fabrication de fibres minérales

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1526099C3 (de) 1965-05-26 1975-08-07 Peter U. Meilen Zuerich Reusser (Schweiz) Schachtofen zum gleichzeitigen Verbrennen von Schlamm und brennbaren festen Abfallstoffen
DE1758638B1 (de) * 1968-07-10 1970-09-03 Huettenwerk Oberhausen Ag Schachtofen
DK267186D0 (da) 1986-06-06 1986-06-06 Rockwool Int Mineraluldsfremstilling
WO1990012761A1 (fr) 1989-04-17 1990-11-01 Rockwool International A/S Four vertical
CN1108379A (zh) * 1994-03-07 1995-09-13 吴金涌 一种低压化铁炉装置
PL369069A1 (en) 2001-07-12 2005-04-18 Rockwool International A/S Method of preparing a fiberizable melt of a mineral material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1203754A2 (fr) * 2000-11-01 2002-05-08 L'air Liquide, S.A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude Procédé et four vertical pour la production des billes de verre
JP2004101178A (ja) * 2003-10-27 2004-04-02 Tokyo Elex Kk 溶融炉
FR2873682A1 (fr) * 2004-07-29 2006-02-03 Saint Gobain Isover Sa Procede et dispositif de traitement de dechets fibreux en vue de leur recyclage
US20080256981A1 (en) * 2004-07-29 2008-10-23 Saint-Gobain Isover Method and Device for Treating Fibrous Wastes for Recycling
WO2008052692A1 (fr) * 2006-11-02 2008-05-08 Rockwool International A/S Procédé et appareil pour la fabrication de fibres minérales

Also Published As

Publication number Publication date
EP2210053A1 (fr) 2010-07-28
DE102007050132A1 (de) 2009-04-23

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