WO1999050196A1 - Procede de fusion de materiaux rocheux pour la production de fibres minerales - Google Patents

Procede de fusion de materiaux rocheux pour la production de fibres minerales Download PDF

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Publication number
WO1999050196A1
WO1999050196A1 PCT/FI1999/000249 FI9900249W WO9950196A1 WO 1999050196 A1 WO1999050196 A1 WO 1999050196A1 FI 9900249 W FI9900249 W FI 9900249W WO 9950196 A1 WO9950196 A1 WO 9950196A1
Authority
WO
WIPO (PCT)
Prior art keywords
rock material
furnace
melting
additive
melt
Prior art date
Application number
PCT/FI1999/000249
Other languages
English (en)
Inventor
Peter LAURÉN
Kimmo Tamminen
Michael Perander
Original Assignee
Paroc Oy Ab
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 Paroc Oy Ab filed Critical Paroc Oy Ab
Priority to AU31489/99A priority Critical patent/AU3148999A/en
Priority to EP99913327A priority patent/EP1089944A1/fr
Publication of WO1999050196A1 publication Critical patent/WO1999050196A1/fr

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

Definitions

  • the present invention relates to a method of melting rock material into a smelt used for manufacturing mineral fiber.
  • the method according to the invention is implemented by performing the melting in a shaft furnace in which the rock material and the amount of fuel proportionated according to the quantity of the rock material is fed into the furnace via an inlet at the top thereof .
  • the rock material is crushed to a proper particle size.
  • the particle size of coke conventionally used as the fuel is selected appropriately.
  • the rock material and coke are charged into this type of furnace in layers, whereby the pile of layered raw materials sinks in the furnace downward as the lower end of the pile melts in the melting zone formed in the bottom part of the furnace and is discharged from the furnace bottom.
  • air is injected upward at a suitable height from the furnace bottom into the mixture of rock material and fuel.
  • the flue gases formed in the fuel combustion process rise through the pile of rock material and fuel until reaching the top of the furnace to be discharged therefrom.
  • the particle size in the pile must be sufficiently large to provide an appropriate free space about the particles.
  • injection nozzles of a special construction are used to feed the combustion air into the melting zone.
  • the melt formed is collected on the furnace bottom into a pool of suitable height by allowing the excess melt to discharge over a weir disposed slightly above the level of the furnace bottom.
  • This pool formation serves to equalize the short-term fluctuations of the melt qualities.
  • the average composition of the melt must be controlled by adjusting the composition of the raw materials to be melted, that is, by adding suitable ingredients to the in- feed material mix.
  • the composition of materials being melted is controlled by sampling the melt, and based thereon, adding the required raw material components to the top of the furnace, into the infeed mix of rock material and fuel.
  • a melt control technique is primarily hampered by the finite transport delay of the added component along with the rock material to the bottom of the furnace. This delay brings about a significant uncertainty factor to the material composition control and, in spite of predictive calculations and estimations, inaccuracy of control results.
  • the composition of the melt is difficult to keep within the set limits.
  • the additive ingredients tra- veiling downward in the raw material pile will be subjected to a relatively long period in contact with the hot flue gases, which leads to loss of additive ingredients 3 through evaporation. Particularly apatite and boron compounds are problematic in this respect.
  • some of the additive ingredients such as bauxite and titanium compounds are slowly melting requiring their grinding to a substantially smaller particle size than the rock material and the fuel .
  • the fine particulate matter causes problems to the passage of flue gases through the material pile as well as loss of material due to entrained transport of material dust, whereby the elimination of these problems necessitates briquetting of additive ingredients into sufficiently large agglomerates.
  • additive ingredient can be introduced along with a carrier medium directly into the melting zone or its immediate vicinity.
  • the additive ingredient can be introduced into the furnace along with the combustion air.
  • the additive ingredient can be mixed with an auxiliary fuel which may be a gaseous, liquid or fine-ground solid fuel.
  • the combinations of the above carriers can be used for introducing the additive ingredient.
  • the melt composition can be primarily controlled using conventional coarse control techniques, so that the initial charge of 4 basic materials known beforehand to be in short supply in the melt and also known to behave rather unproblematical- ly in the melting process, are added slightly undercompensated into the melting furnace. Then, the special cha- racter of the present invention can be utilized for fine control of the melt composition and the introduction of hard-to-melt additive ingredients.
  • the introduction of the additive ingredient along with its carrier medium can be complemented by feeding enriching oxygen into the melting zone, whereby the feed rate of oxygen addition is adjusted compatible with the actual composition of additive ingredients thus creating advan- tageous conditions for the melting thereof in melting zone. Due to the presence of carbon, the overall conditions in the melting zone are reducing. The degree of reducing conditions can be decreased by the oxygen addition, or even reversed into oxidizing conditions if the excess amount of oxygen addition is sufficiently large.
  • the introduction of the enriching oxygen is advantageously carried out separately from the introduction of additive ingredients and also is provided with an independent control facility. This can be accomplished by different types of injection nozzle constructions having separate channels on one hand for the additive ingredient (s) and its carrier and on the other hand for the enriching oxygen.
  • melt viscosity is primarily affected by the melt composition and temperature.
  • the available raw material and/or the raw material 5 mix giving the desired melt composition may be such that melts at a high temperature requiring the melt to kept at a high melt temperature, too.
  • This melt pool temperature may be excessively high to maintain the optimal viscosity, which subsequently causes problems in the fi- berizing stage.
  • the method according to the invention can offer a solution to problem by allowing the introduction of such an additive ingredient that has no significant effect on the melt composition.
  • the mel- ting of such an additive ingredient binds heat thus lowering the melt temperature.
  • One useable additive for this purpose is recycled fiber, preferably in milled form.
  • the control of melt composition by virtue of the method according to the invention may also be used for controlling the composition-dependent viscosity of the melt.
  • the implementation of the invention may be accomplished by means of conventional infeed equipment based on, e.g., the use a carrier gas flow into which solid particulate matter is introduced with the help of a separate feed apparatus .
  • the feed apparatus in an embodiment of such equipment comprises a rotating compartmental feeder adapted centrally in a cylindrical container, said feeder having its compartments bordered by the cylindrical shell of the container and its end surfaces.
  • the carrier gas flow is provided with opposite aligned inlet and outlet nozzles, respectively, at the opposite ends of the cylindrical container thus permitting the carrier gas flow to entrain the solid particulate matter loaded in the com- partments as they sequentially meet the opposed nozzles.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un procédé de fusion de matériaux rocheux destinés à la production de fibres minérales. Ce procédé consiste à introduire dans un four à cuve, le matériau rocheux concassé et une certaine quantité de combustible, dosé en fonction de la quantité de matériau rocheux, ainsi que d'éventuels adjuvants, et à introduire dans une partie inférieure du four, de l'air de combustion éventuellement complété par un combustible auxiliaire, de façon à créer une zone de fusion. On évacue le matériau rocheux fondu de la partie inférieure du four. Selon ce procédé, on introduit au moins une partie des adjuvants, avec un milieu de support, directement dans la zone de fusion ou à proximité de celle-ci.
PCT/FI1999/000249 1998-03-27 1999-03-26 Procede de fusion de materiaux rocheux pour la production de fibres minerales WO1999050196A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU31489/99A AU3148999A (en) 1998-03-27 1999-03-26 Method for melting rock material for mineral fibre production
EP99913327A EP1089944A1 (fr) 1998-03-27 1999-03-26 Procede de fusion de materiaux rocheux pour la production de fibres minerales

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI980710 1998-03-27
FI980710A FI980710A (fi) 1998-03-27 1998-03-27 Menetelmä kiviaineksen sulattamiseksi mineraalikuituvalmistusta varten

Publications (1)

Publication Number Publication Date
WO1999050196A1 true WO1999050196A1 (fr) 1999-10-07

Family

ID=8551405

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000249 WO1999050196A1 (fr) 1998-03-27 1999-03-26 Procede de fusion de materiaux rocheux pour la production de fibres minerales

Country Status (4)

Country Link
EP (1) EP1089944A1 (fr)
AU (1) AU3148999A (fr)
FI (1) FI980710A (fr)
WO (1) WO1999050196A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003002469A1 (fr) * 2001-06-27 2003-01-09 Rockwool International A/S Procede et appareil de fabrication de fibres minerales
US8176754B2 (en) 2001-06-27 2012-05-15 Rockwool International A/S Process and apparatus for making mineral fibres

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277274A (en) * 1977-12-27 1981-07-07 Owens-Corning Fiberglas Corporation Process for controlling molten glass variables
WO1987007591A1 (fr) * 1986-06-06 1987-12-17 Rockwool International A/S Procede de preparation d'un bain de fusion pour la production de laine minerale et four a cuve permettant de realiser ledit procede
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
US4877449A (en) * 1987-07-22 1989-10-31 Institute Of Gas Technology Vertical shaft melting furnace and method of melting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277274A (en) * 1977-12-27 1981-07-07 Owens-Corning Fiberglas Corporation Process for controlling molten glass variables
WO1987007591A1 (fr) * 1986-06-06 1987-12-17 Rockwool International A/S Procede de preparation d'un bain de fusion pour la production de laine minerale et four a cuve permettant de realiser ledit procede
US4877449A (en) * 1987-07-22 1989-10-31 Institute Of Gas Technology Vertical shaft melting furnace and method of melting
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003002469A1 (fr) * 2001-06-27 2003-01-09 Rockwool International A/S Procede et appareil de fabrication de fibres minerales
US8176754B2 (en) 2001-06-27 2012-05-15 Rockwool International A/S Process and apparatus for making mineral fibres

Also Published As

Publication number Publication date
EP1089944A1 (fr) 2001-04-11
FI980710A (fi) 1999-09-28
AU3148999A (en) 1999-10-18
FI980710A0 (fi) 1998-03-27

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