EP3856688A1 - Four a bruleur immerge - Google Patents
Four a bruleur immergeInfo
- Publication number
- EP3856688A1 EP3856688A1 EP19795262.5A EP19795262A EP3856688A1 EP 3856688 A1 EP3856688 A1 EP 3856688A1 EP 19795262 A EP19795262 A EP 19795262A EP 3856688 A1 EP3856688 A1 EP 3856688A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- raw material
- vitrifiable
- furnace
- duct
- molten
- 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- Withdrawn
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B3/00—Charging the melting furnaces
- C03B3/005—Charging the melting furnaces using screw feeders
-
- 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
-
- 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
- C03B2211/00—Heating processes for glass melting in glass melting furnaces
- C03B2211/20—Submerged gas heating
- C03B2211/22—Submerged gas heating by direct combustion in the melt
- C03B2211/23—Submerged gas heating by direct combustion in the melt using oxygen, i.e. pure oxygen or oxygen-enriched air
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2211/00—Heating processes for glass melting in glass melting furnaces
- C03B2211/40—Heating processes for glass melting in glass melting furnaces using oxy-fuel burners
-
- 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 invention relates to a submerged burner oven particularly suitable for recycling fragments of mineral wool and whose energy efficiency is advantageous.
- US3294505 teaches the melting of vitrifiable materials in a cupola furnace (“cupola furnace” in English) according to which raw materials mixed with coke are introduced into a vertical duct, an ascending current of air passing through the raw materials to burn the coke, heat and cause these materials to melt.
- the molten vitrifiable material is collected at the lower level of the mixture of raw materials and coke.
- Coke is however a very important source of CO2.
- EP2100858A1 proposed to replace coke with natural gas using overhead burners.
- Raw materials are introduced into a vertical duct and retained by a grid, an ascending stream of combustion gases coming from overhead burners placed between the molten material and the grid crosses the grid then the raw materials causing the fusion of these materials.
- the molten vitrifiable material is collected in a tank under the grid, said molten vitrifiable material then being discharged by flow through an orifice.
- fragments of mineral wool added to the raw material volatilize too easily taking into account the strong gas currents crossing the raw material against the current or tend to block the passage of said gas streams through the feed of raw material, reducing the efficiency system energy;
- the fragments of mineral wool can be compacted in the form of briquettes bound by a cement-type binder, but this requires an expensive additional preparation and the melting of the cement briquettes generate unwanted sulfur oxide emissions;
- the temperature of the molten material is around 1450 ° C, which is too low for certain applications; replacing air as oxidizer with oxygen increases the temperature, but this results in a prohibitive energy cost.
- the vitrifiable material in the tank is heated by submerged combustion; heat is therefore directly brought into the molten material and the absorption of flame radiation by the molten material has a relatively moderate effect on the effective transfer of heat;
- - submerged combustion is carried out by combustion of combustible gas (producing less CO2 than coke), in particular natural gas with an oxidizer, preferably rich in oxygen (that is to say at least 80% by volume d 'oxygen); as the combustion is carried out within the molten material, the energy transfer is excellent and does not require a large excess of combustion to reach the desired temperature generally greater than 1500 ° C;
- the invention relates firstly to a device for melting vitrifiable material comprising an oven provided with at least one submerged burner, a system for supplying the submerged burner with combustible gas and with oxidant, which preferably comprises at least 80% by volume of oxygen, a system for supplying the raw material to the furnace comprising fragments of mineral wool beneath the surface of the molten vitrifiable materials, a system for supplying the raw material to the furnace comprising a vertical duct capable of receiving raw material by its upper side and able to conduct this raw material down over the molten vitrifiable materials, said duct being capable of receiving combustion fumes from the oven and driving them upward through the raw material in the conduit, a means for supporting the solid raw material in the conduit, said means being disposed above the surface e of the meltable vitrifiable material and
- the support means generally comprises a grid disposed substantially horizontally above the bath of molten vitrifiable material.
- the raw material introduced into the duct can rest directly on the grid if the particle size of this raw material and the mesh size of the grid allow the grid to retain this raw material.
- a bed of refractory balls can also be placed directly on the grid before introducing the raw material into the conduit. These balls are not primarily intended to play the role of raw material but it is not excluded that they enrich the vitrifiable material a little in a compound, in particular in alumina.
- the system for supplying the submerged burner with combustible gas and with oxidizer preferably comprising at least 80% by volume of oxygen comprises sources of combustible gas and, by this oxidizer, pipes for supplying the submerged burner with combustible gas and by this oxidizer, a system for adjusting the quantities of combustible gas and this oxidant supplying the submerged burner.
- Raw material is introduced solid from the upper side of the conduit and melts above the support means for this raw material, the material first fondue falling into the bath of vitrifiable material in fusion in the oven.
- This raw material is therefore introduced in the molten state into the mass of molten vitrifiable material by falling in liquid form (drops or liquid streams) to the surface of the bath of molten vitrifiable material.
- the vertical duct plays a triple role: - supply of raw material, - evacuation of fumes, - heat exchanger by allowing the heating of the raw material in the duct by fumes.
- the duct is vertical insofar as the direction of transport of the raw material which it contains comprises a vertical component, or even is essentially vertical, the gravity sufficient for this raw material to descend into the duct under the effect of its own weight.
- the conduit can therefore be inclined as soon as the material it contains can descend on its own under the effect of gravity.
- the so-called vertical conduit is a conduit capable of conveying the raw material with a vertical component downward under the effect of gravity.
- fragments of mineral wool designates all residues resulting from the production of mineral wool, including mineral materials solidified in the form of grains or infibers, or recovered in the form of solid flights, or bundles of fibers recovered (by washes) on the various receiving or conveyor surfaces, as well as cut mineral wool felt.
- This waste can also come from deconstruction. It is therefore waste well known to those skilled in the art and which it is proposed to recycle in the context of the present invention without the need to transform them beforehand into briquettes.
- the fragments of mineral wool generally include rock wool or glass wool and a sizing to bind the fibers of the wool. This sizing can be mineral but is generally organic.
- the sizing composition included in the fragments of mineral wool is generally present in an amount of 0.1 to 10% by weight and more particularly in an amount of 0.5 to 7% by weight of dry sizing material relative to the weight total of dry wool fragments.
- the organic matter in the size burns in the oven.
- Mineral wool generally includes (excluding sizing):
- AI2O3 0 to 30% by weight
- rock wool also called “black glass” by the skilled person
- the main components of rock wool are generally (excluding sizing):
- AI2O3 10 to 22% by weight
- Iron oxide 3 to 15% by weight.
- the main components of a glass wool are generally (excluding sizing):
- AI2O3 0 to 8% by weight
- Iron oxide 0 to 3% by weight
- the fragments of mineral wool are a raw material.
- the furnace is also supplied with raw material separate from the fragments of mineral wool.
- It can be powder, granules, balls, agglomerates, pebbles, stones, rocks, the forms of all these elements being considered as "granular".
- These granular shapes can be regular because they are shaped, or irregular because they come directly from quarries or from manufacturing processes which do not lead to a regular shape.
- agglomerates, granules or balls can be produced by compacting powders by a hoop compactor or a drum granulator, generally also thanks to the presence of a binder.
- the raw material is introduced either through the vertical conduit above the bath of vitrifiable material in fusion (high particle size), or under the surface of the bath of vitrifiable material in fusion (small particle size).
- the volatile raw material is preferably introduced under the surface of the bath of molten vitrifiable material, and the non-volatile raw material through the upper side of the vertical duct.
- the volatility considered is that vis-à-vis combustion fumes. Fragments of mineral wool and raw material powder are volatile and therefore introduced under the surface of the bath of molten vitrifiable material.
- the raw material introduced into the vertical duct is preferably such that at least 80% or even at least 90% of its mass consists of grains of size greater than 30 mm, generally of size between 40 and 500 mm.
- This raw material is generally free from fragments of mineral wool. Briquettes produced by compacting fragments of mineral wool are not considered here as fragments of mineral wool.
- the raw material comprising fragments of mineral wool introduced under the surface of the molten vitrifiable material may comprise raw material distinct from the fragments of mineral wool, at least 80% or even at least 90% or even 100% of the mass of this material first distinct being made up of grains of size less than 30 mm.
- the size of a grain is the distance between its two most distant points.
- the raw material comprises different compounds necessary for the preparation of the desired composition of vitrifiable material. It generally comprises silica and at least one carrier of alkaline earth and / or alkali such as calcium carbonate, magnesium carbonate, sodium carbonate.
- the raw material comprising the fragments of mineral wool is introduced under the surface of the vitrifiable materials in fusion, for example by at least one worm, in particular such as that described in WO2013132184.
- the system for supplying the raw material to the furnace below the surface of the molten vitrifiable materials generally comprises at least one worm.
- the raw material comprising the fragments of mineral wool can also be introduced beneath the surface of the vitrifiable materials in fusion using a piston system pushing it into the furnace.
- the furnace comprises a vertical duct leading from the raw material down to the surface of the vitrifiable materials in fusion.
- This raw material is introduced into this conduit through its upper side.
- the combustion gases coming from under this support means pass through it and pass upwards, across and against the flow of the raw material in the conduit. These gases heat this raw material until it melts and the molten raw material descends, passes through the support means downwards and joins the vitrifiable material in fusion in the furnace, falling in the liquid state to the surface of the material bath. vitrifiable.
- the combustion fumes are discharged through the conduit against the current of the raw material it contains.
- the support means is permeable to the molten raw material passing through it going down and permeable to combustion gases passing through it going up.
- the mass of raw material introduced under the surface of the molten vitrifiable material represents 5 to 70% of the sum of the masses of all the raw materials introduced into the device.
- the mass of fragments of mineral wool generally represents 50 to 100% of the sum of the mass of raw material introduced under the surface of the batch of vitrifiable material.
- the feed system beneath the surface of the vitrifiable materials in fusion is capable of introducing into the furnace a raw material comprising 50 to 100% of fragments of mineral wool by mass.
- the raw material introduced under the surface of the molten vitrifiable material has a different chemical composition from that introduced by the upper side of the conduit.
- the means for supporting the solid raw material in the duct may comprise a grid on which a bed of balls rests directly. These refractory balls also play a role of grid and slow down the descent of raw material in the conduit.
- These refractory balls can be of the oxide type. They generally comprise at least 25% by weight of alumina, more generally 25 to 90% by weight of alumina. Generally the refractory balls have a size between 5 and 30 cm. The size of a refractory ball means the distance between its 2 most distant points. These refractory balls are sufficiently refractory to be essentially infusible in the stream of combustion fumes.
- refractory balls containing alumina can nevertheless play a role in enriching the molten vitrifiable material with alumina. So preferably bullets refractories comprising alumina rest on the grid, the solid raw material in the duct resting on these balls.
- the grid may include metal tubes through which cooling water passes.
- the metal of these tubes is sufficiently resistant to the medium in question. It can be made of steel.
- the furnace can also be provided with at least one overhead burner, the flame of which is emitted above the surface of the vitrifiable materials in fusion and under the means for supporting the solid raw material in the duct, in particular a grid of the means of support.
- an overhead burner passes through a side wall or the roof of the oven.
- the invention also relates to a process for the preparation of molten vitrifiable material comprising the melting of vitrifiable material by the device according to the invention, of the raw material comprising fragments of mineral wool being introduced into the furnace below the surface of the vitrifiable material in melting, of the raw material being introduced into the vertical duct, descending into the duct and being heated there by the combustion fumes until fusion and flow in the surface of the molten vitrifiable material, the submerged burner operating by combustion of gas fuel and an oxidizer preferably comprising at least 80% by volume of oxygen.
- the oxidizer supplying the submerged burner is gaseous. It preferably comprises at least 80% by volume of oxygen. It can be oxygen-enriched air or pure oxygen.
- the fuel supplied to the submerged burner is gaseous and is generally natural gas.
- the combustion in the furnace is sufficiently energetic for the fumes to be hot enough to melt the raw material above the means for supporting the solid raw material in the duct.
- the use of an oxidizer rich in oxygen makes it possible to minimize the production of NOx and also to minimize the volume of combustion gas produced compared to combustion in air.
- the vitrifiable material can be heated in the oven to a temperature higher than 1400 ° C, or even higher than 1450 ° C, or even higher than 1500 ° C, even even higher than 1550 ° C and generally lower than 1600 ° C.
- the vitrifiable material can be heated in the oven to a temperature between 1400 and 1600 ° C.
- the tank of the oven is advantageously made of metal cooled by a stream of water, a system called by a person skilled in the art "water jacket".
- the submerged burner is advantageously also made of metal cooled by a stream of water.
- the oven is advantageously equipped with one or more submerged burners.
- a submerged burner used in the context of the present invention can be of cylindrical shape as shown in FIG. 5 of WO9935099. It can also be of linear shape as taught by WO2013117851, shape particularly adapted to the present invention.
- the device according to the invention is intended for the preparation of a molten vitrifiable material, generally of the oxide type, generally comprising at least 30% by mass of silica, such as a glass or a silicate such as an alkali silicate and / or alkaline earth.
- the vitrifiable material thus prepared may have one of the compositions given above for mineral wool, in particular glass or rock (the term “rock” here designating a type of composition and not an appearance).
- the batch material comprises 30 to 75% by weight of S1O2 and 5 to 40% by weight of (CaO + MgO).
- the vitrifiable material can in particular be used for the manufacture of fibers or mineral wool.
- the device according to the invention can be followed by a fiberizing member for the manufacture of fibers or mineral wool.
- FIG. 1 represents an example of a device according to the invention seen in side section.
- This device comprises an oven 1 provided with submerged burners 2 mounted in the hearth. These submerged burners are supplied by a fuel gas supply system 3 and by oxidant. The submerged burners provide flames in the mass 4 of the bath of molten vitrifiable materials.
- a system of the worm 5 type makes it possible to supply the furnace with fragments of mineral wool and, where appropriate, with raw material distinct from the wool and of small particle size under the surface 6 of the vitrifiable materials in fusion.
- a vertical duct 7 above the surface of the molten vitrifiable material 4 makes it possible to supply the tank 8 of the furnace with raw material 9 of large particle size.
- the raw material 9 is introduced through the upper end of the conduit 7 and is retained above the surface 6 of the vitrifiable material in fusion by a support means comprising a grid 10 and balls 11 rich in alumina resting on the grid.
- the combustion fumes generated by the burners and under the grate pass through the grate and the balls and go up in the duct 7 acting as a chimney, through the raw material 9.
- This raw material is thus heated by these fumes and gradually melted.
- the melted raw material 12 flows through the support means (grid + balls) of the solid raw material in the conduit and falls into the mass 4 of vitrifiable materials in fusion.
- the combustion fumes 13 having passed through the raw material in the duct 7 are discharged through the upper end of the duct 7.
- the molten vitrifiable material can be discharged through an orifice 14 in a wall of the tank 8 of the oven.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Glass Compositions (AREA)
- Glass Melting And Manufacturing (AREA)
- Furnace Details (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1858984A FR3086740B1 (fr) | 2018-09-28 | 2018-09-28 | Four a bruleur immerge |
| PCT/FR2019/052251 WO2020065211A1 (fr) | 2018-09-28 | 2019-09-25 | Four a bruleur immerge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3856688A1 true EP3856688A1 (fr) | 2021-08-04 |
Family
ID=65685531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19795262.5A Withdrawn EP3856688A1 (fr) | 2018-09-28 | 2019-09-25 | Four a bruleur immerge |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20210395127A1 (fr) |
| EP (1) | EP3856688A1 (fr) |
| FR (1) | FR3086740B1 (fr) |
| MX (1) | MX2021003201A (fr) |
| WO (1) | WO2020065211A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK4097055T3 (da) * | 2020-01-30 | 2025-03-31 | Rockwool As | Fremgangsmåde til fremstilling af syntetiske glasfibre |
| FR3116815B1 (fr) * | 2020-11-30 | 2023-04-28 | Saint Gobain Isover | Procede de traitement de dechets verriers |
| US12084378B2 (en) * | 2021-04-16 | 2024-09-10 | Owens-Brockway Glass Container Inc. | Feeder tank for a glass melter |
| EP4442654A1 (fr) * | 2023-04-06 | 2024-10-09 | Ankerpoort N.V. | Procédés de recyclage de calcin et de fibre de verre |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3294505A (en) | 1963-12-27 | 1966-12-27 | United States Gypsum Co | Process of producing glass in a cupola |
| ZA72390B (en) * | 1971-02-01 | 1972-09-27 | Hayes Shell Cast Ltd | Metal-melting furnaces |
| US3925024A (en) * | 1971-09-10 | 1975-12-09 | Borden Inc | Grid burner system |
| DE2611458C2 (de) * | 1976-03-18 | 1977-12-29 | Klöckner-Werke AG, 4100 Duisburg | Verfahren und Vorrichtung zur Herstellung von Gußeisen |
| US4140480A (en) * | 1977-07-18 | 1979-02-20 | Modern Equipment Company | Hot cupola gas burner |
| YU46333B (sh) * | 1987-04-30 | 1993-05-28 | Oy Partek Ab | Talilna pec |
| US4877449A (en) * | 1987-07-22 | 1989-10-31 | Institute Of Gas Technology | Vertical shaft melting furnace and method of melting |
| DE4339675C1 (de) * | 1993-11-22 | 1995-05-04 | Messer Griesheim Gmbh | Verfahren und Vorrichtung zum Einschmelzen von festen Verbrennungsrückständen |
| CZ297579B6 (cs) | 1998-01-09 | 2007-02-07 | Saint-Gobain Vitrage | Zpusob a zarízení pro tavení a cerení zeskelnovatelných materiálu |
| US6221123B1 (en) * | 1998-01-22 | 2001-04-24 | Donsco Incorporated | Process and apparatus for melting metal |
| US20110062013A1 (en) * | 2007-02-27 | 2011-03-17 | Plasco Energy Group Inc. | Multi-Zone Carbon Conversion System with Plasma Melting |
| DE102008014044B4 (de) | 2008-03-13 | 2013-04-04 | Grenzebach Bsh Gmbh | Verfahren zur Herstellung von silikatischen Schmelzen |
| FR2986605B1 (fr) | 2012-02-08 | 2018-11-16 | Saint-Gobain Isover | Bruleur immerge a injecteurs multiples |
| FR2987617B1 (fr) * | 2012-03-05 | 2017-03-24 | Saint Gobain Isover | Enfourneuse avec tete amovible pour enfournement immerge |
-
2018
- 2018-09-28 FR FR1858984A patent/FR3086740B1/fr active Active
-
2019
- 2019-09-25 WO PCT/FR2019/052251 patent/WO2020065211A1/fr not_active Ceased
- 2019-09-25 MX MX2021003201A patent/MX2021003201A/es unknown
- 2019-09-25 EP EP19795262.5A patent/EP3856688A1/fr not_active Withdrawn
- 2019-09-25 US US17/279,329 patent/US20210395127A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020065211A1 (fr) | 2020-04-02 |
| FR3086740A1 (fr) | 2020-04-03 |
| US20210395127A1 (en) | 2021-12-23 |
| FR3086740B1 (fr) | 2021-01-01 |
| MX2021003201A (es) | 2021-05-27 |
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