WO2016048249A1 - Procédé et dispositif de production de fibres de laine minérale - Google Patents

Procédé et dispositif de production de fibres de laine minérale Download PDF

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Publication number
WO2016048249A1
WO2016048249A1 PCT/SI2014/000054 SI2014000054W WO2016048249A1 WO 2016048249 A1 WO2016048249 A1 WO 2016048249A1 SI 2014000054 W SI2014000054 W SI 2014000054W WO 2016048249 A1 WO2016048249 A1 WO 2016048249A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotating cylinder
air flow
mineral wool
producing
mineral
Prior art date
Application number
PCT/SI2014/000054
Other languages
English (en)
Inventor
Brane ŠIROK
Anton Platiša
Sašo DOLENC
Benjamin BIZJAN
Marko PETERNELJ
Original Assignee
Izoteh D.O.O.
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 Izoteh D.O.O. filed Critical Izoteh D.O.O.
Priority to PCT/SI2014/000054 priority Critical patent/WO2016048249A1/fr
Publication of WO2016048249A1 publication Critical patent/WO2016048249A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/04—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor
    • C03B37/05—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor by projecting molten glass on a rotating body having no radial orifices
    • C03B37/055—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor by projecting molten glass on a rotating body having no radial orifices by projecting onto and spinning off the outer surface of the rotating body

Definitions

  • the invention relates to an centrifugal device for producing mineral wool from fibers that are obtained from mineral melt by means of a centrifugal force, generated by one or more, usually four, cascading rotating cylinders and are pneumatically transported to an accumulation grid by an axial air flow generated by the blowing nozzles along the outer surfaces of the rotating cylinders.
  • Technical problem addressed is failure to achieve good and uniform intertwining of the mineral fibers, good and uniform wetting of the mineral fibers by the binder, and tearing of the primary layer once deposited on the accumulation grid. Further technical problem is tearing-off molten chunks of material from rotating cylinder causing loss of material and decreasing the productivity.
  • Said coaxial air flow directs the fibers being formed and wetted by the binder towards the accumulation grid that is positioned perpendicularly or at a certain angle to the direction of said air flow.
  • This coaxial flow is referred to (for purposes of this application) as main coaxial air-fiber flow.
  • Solid state, binder-wetted mineral fibers are deposited on the accumulation grid to form a primary layer of mineral wool.
  • This basic principle of producing mineral wool by means of an centrifugal device is described in patents WO-A1-93/13025, WO-A1-95/14135, WO-Al -96/ 16912 and WO 99/59929.
  • Main challenge of described mineral wool production method is to attain a good and uniform intertwining of the mineral fibers, a good and uniform wetting of the mineral fibers by the binder and to prevent the mineral fiber layer, once deposited on the accumulation grid, from tearing which is induced by extremes of the coaxial air flow velocity near the accumulation grid.
  • Patent WO-Al -93/13025 addresses uniformity of the mineral fibers deposit on the accumulation grid
  • Patent WO-A1-95/14135 deals with the mineral fiber wetting by the binder; however, the problem of the tearing of the layer of mineral fibers, deposited on the accumulation grid is not addressed.
  • Patent WO-Al - 96/16912 deals with the effect of the mineral melt viscosity on the mineral wool quality, solving it in terms of geometrical disposition and rotational speed of the rotating cylinders. It considers neither the problem of the mineral fiber wetting by the binder nor the problem of the mineral fiber layer tearing on the accumulation grid.
  • Patent WO 99/59929 deals with the problem of the intertwining of the mineral fibers and their wetting by the binder and the problem of further reducing tearing of the layer of mineral fibers deposited on the accumulation grid by directing part of axial flow of air against blow-in flow.
  • Method for producing mineral wool and device for carrying out this method solve above referenced technical problem by manipulating air flow around said rotating cylinder so air flows past backward facing edge of said rotating cylinder at an angle relative to axis of said rotating cylinder.
  • This can be achieved either by shaping the edge of the rotating cylinders by chamfering the edge of the rotating cylinder facing upstream direction of air flow, or by adding a radial fan to the rotating cylinder, namely to side of the rotating cylinder facing upstream direction of air flow (hereinafter referred to as back side or backward facing side or backward facing direction of said rotating cylinder),
  • back side or backward facing side or backward facing direction of said rotating cylinder Such a solution directs air flow coming from back side of the rotating cylinder in general direction of settling chamber (i.e.
  • Device for producing of mineral wool solves above referenced technical problem by shaping back side of at least one rotating cylinder (i.e. side which faces oncoming air flow, and is facing away from settling chamber) as a radial fan or attaching a radial fan to said back side of said rotating cylinder.
  • the present invention therefore represents a novel design of the rotating cylinders of the device for production of mineral wool.
  • Said invention solves the technical problem of producing superior quality mineral wool by said process, it being recognized that the characteristics ⁇ f "" the ⁇ mineral — wool -" depend- on — the " ⁇ geometrical ⁇ ” an " d — mechanical " characteristics of the mineral fibers, their mean length, their mutual intertwining and their wetting by the binder.
  • the quality of the mineral wool produced by said process proportionally depends on the homogeneity and on the isotropy of said parameters.
  • the objective of the invention is to design centrifugal device for production of mineral wool that will provide a better and more uniform wetting of the mineral fibers by the binder, a better and more uniform mutual intertwining of the mineral fibers, an increase in the mean ligament length and reduction of the tearing of the layer of mineral fibers already formed on the accumulation grid.
  • the design of said mineral wool production device must be robust, meaning that it allows said improvements in the quality of the produced mineral wool to be met for a wide range of operating parameters and that it is not sensitive to occurrences which could reduce its efficiency during prolonged periods of operation, e.g. the contamination by fibers and/or binder.
  • This method is comprised of the following steps:
  • manipulating of said air flow field can be achieved by directing incoming air flow induced by either rotation of said cylinders or by other means (in state of the art by, for example, adding axial centrifugal devices) over rotating cylinder chamfered edge facing the direction of oncoming flow.
  • Method for producing of mineral wool may be further improved if said air flow direction is such that magnitude of relative velocity between said air flow and said fibers forming off said rotating cylinders is as low as possible.
  • air flow is formed by either nozzles or some other axial centrifugal device known in state of the art, or by even inducing air flow through rotation of said rotating cylinder.
  • This air flow is directed by either chamfered backward facing edge of said rotating cylinder or by addition of radial fan to the backward facing side of said rotating cylinder, or by forming of said backward facing side of said rotating cylinder into blades resembling radian fan in such a way that flow no longer displays essentially axial flow field characteristics, but also some radial component thus resulting in air flow no longer flowing essentially parallel to rotating cylinder axis around said rotating wheel but at some angle relative to said rotating cylinder axis.
  • the problem described is solved by method of manipulating air flow which can be achieved either by chamfering back side of said rotating cylinder, or alternatively, by shaping back side of at least one of the rotating cylinders as a radial fan or by adding such radial fan to said back side of said rotating cylinder, said radial fan generating new radial air flow, directed outwards, and an axial air flow component, directed in the same direction as the main blow-in flow. Also, downstream of said blowing nozzles and upstream of said radial fan, a concentric, chamfered orifice plate is placed to optimally direct the air flow from said nozzles onto said radial fan.
  • the axial air flow from the blowing nozzles and the additional axial and radial flow components generated by said radial fan produce a coaxial, conically-shaped air flow with a significant tangential (swirl) component, looking in the absolute reference frame.
  • the air flow direction is such that the magnitude of relative velocity between said air flow and the fibers forming on said rotating cylinders is as low as possible.
  • the direction of said air flow is such that its absolute velocity makes a relatively shallow angle to the direction of local fiber orientation.
  • the swirl component of the blow-in air flow determines an aerodynamically more stable and spatially more uniformly distributed fiber layer in the phase of pneumatic transport by said air flow, also resulting in a better and more uniform intertwining of said fibers and a more uniform mineral wool primary layer deposit on the accumulation grid. Also, the swirling component of the blow-in air flow improves the dispersion of the binder and subsequent wetting of the fibers by the droplets of said binder.
  • Figure 1 is a side view of the centrifugal device for producing mineral wool with an accumulation grid and with air flows traced out.
  • Figure 2 is a front view of the rotating cylinders of the centrifugal device for producing mineral wool with blowing nozzles and radial fan blades shown with a schematic sketch of the course of the mineral melt.
  • Figure 3 shows a section taken along the A-A line of Figure 2, of a rotating cylinder with its back shaped so as to form a radial fan, with air flows traced out.
  • Figure 5 shows a concentric, chamfered orifice plate located between the blowing nozzles and the ventilator rotor.
  • FIG. 6 shows chamfered rotating cylinder showing also direction of air flow which is being manipulated by such arrangement.
  • a centrifugal device 1 for producing mineral wool 8 comprises one or more, typically four cascading rotating cylinders 3 that each produce centrifugal force, at least one blowing nozzle 6 that generate axial air flow 12 in the duct 9 upstream of the rotating cylinders 2, chamfered orifice plate 5 located between said blowing nozzles and said rotating cylinders and an accumulation grid 2.
  • the back of at least one of the rotating cylinders is shaped so as to form a radial fan 4 that produces an additional radial-axial air flow 13 with outwards radial flow component and an axial flow component in the main axial flow 12 direction.
  • This radial fan may be shaped as a ventilator rotor 4. Further, the body of said ventilator rotor 4 may be circular in form. Further, the body of said ventilator rotor 4 is thinner at the edge i.e., at the outer radius, thickening inwards i.e., towards the inner radius.
  • the invention thus relates also to centrifugal device 1 for producing mineral wool 8 from fibers 7 that are obtained from mineral melt 10 by means of a centrifugal force, generated by one or more, usually four, cascading rotating cylinders 3 and are pneumatically transported to an accumulation grid by the blow-in air flow 14 produced by the combination of axial flow 12 generated by the blowing nozzles along the outer surfaces of the rotating cylinders, and a radial-axial flow 13 generated by the ventilator rotor 4 of radial fan attached to the back side of at least one of the rotating cylinders 3. Additional effect on the air flow characteristics prior to entering the ventilator rotor 4 is provided by a concentric, chamfered orifice plate located slightly upstream of the rotor 4 blades 17.
  • the invention solves a technical problem of improving the mutual intertwining of the mineral fibers, improving the wetting of the mineral fibers by the binder, increasing the fiber length and preventing the primary layer of mineral fibers from tearing once deposited on the accumulation grid.
  • blades 17 which extend to a radius greater than the outer radius 15 of the body of said rotor 4.
  • the blade working faces are parallel to the rotation axis of the rotating cylinders 3 and have a given inclination between 0° and 45° to the radial direction, and bend slightly in the direction opposite to the direction of rotation 18 of the rotating cylinder 3 toward the outer radius 16.
  • Said part of said blades 17 may be uncovered or covered by a radial cover 27 attached to said blades.
  • the section of blades 17 outwards from said rotor 4 body outer radius 15 is shaped so as to allow the optimal passing of axial flow 12, which may include a spatial curving of said blade 17 cross section about the radial axis as the distance from the cylinder 3 rotation axis is increased.
  • a concentric, chamfered orifice plate 5 is positioned in the air duct 9 between the blowing nozzles 9 and the ventilator rotor 4 and may partially, or not at all overlap said rotor blades 17.
  • the inner diameter 21 of said orifice plate 5 is between 50% and 99% of the duct 6 inner diameter 20 and greater than the blade 17 outer diameter.
  • Said orifice plate 5 is chamfered at both inner edges with equal or different chamfer angles 23 and 24, respectively, each between 0° and 90° where angles 0° and 90° mean an un- chamfered orifice plate.
  • the chamfer of both inner edges of said orifice plate 5 starts at the orifice inner diameter 21 and ends at the orifice outer diameter 20.
  • Said orifice plate 5 may form a full circle or a partial circular section about the cylinder 3 rotation axis.
  • FIG. 1 shows the centrifugal device 1 for producing mineral wool 8 with a traveling accumulation grid 2.
  • the rotating cylinders 3 generate a centrifugal force which causes the mineral melt 10 to scatter into fibers.
  • the back of each cylinder 3 is shaped as a radial fan in the form of a ventilator rotor 4 that generates the additional radial air flow directed outwards and axial air flow directed in the same direction as the main blow-in flow from the blowing nozzles 6 placed in a circular duct 9 behind the adjacent rotating cylinder 3.
  • the rotor 4 has a typically radial rotor design at small radii and gradually transforms to an axial-like design at radii greater than the radius of the adjacent rotating cylinder 3.
  • a wide concentric orifice plate 5 with both sides chamfered at certain angles is located with the inner diameter 21 slightly smaller than the diameter 20 of the duct 9.
  • the blowing nozzles 6 along the edges of the rotating cylinders 3 produce an axial air flow 12, which is mixed with the radial-axial flow component 13 generated by the rotor 4, to form the blow-in flow 14 which conveys the mineral fibers 7 to the accumulation grid 2.
  • mineral wool 8 is formed.
  • the axial air flow 12 from the blowing nozzles 6 and the radial-axial air flow 13, generated by the ventilator rotor 4 also affect the definitive forming and solidification of the mineral fibers 7 from the mineral melt 10 and induce a better and more uniform mutual intertwining of the mineral fibers 7.
  • Figure 2 shows a front view of the four rotating cylinders 3 with radial fans 4 mounted on back sides (fan blades are only shown on the two rightmost cylinders), behind which the blowing nozzles 6 are situated. Between the cylinder radial fans 4 and blowing nozzles 6, the orifice plate 5 is installed.
  • the mineral melt 10 is directed onto the mantle of the first (i.e., topmost) rotating cylinder 3. On the mantle of the rotating cylinder 3 a thin mineral melt film 19 is formed, out of which fibers are generated by the centrifugal force.
  • part of the mineral melt 10 is scattered into fibers and blown off by the blow- in air flow 14 from the blowing nozzles 6, whereas the remaining part of the mineral melt 1 1 is accelerated by the first rotating cylinder 3 and flung onto the next rotating cylinder 3, where the process is repeated. This process is then repeated until the last rotating cylinder 3 is reached, where the last remaining portion of the mineral melt 10 is scattered into fibers.
  • the topmost rotating cylinder 3 rotates anti-clockwise, the next one rotates in the opposite direction, i.e. clockwise, and each of the following cylinders rotates in the opposite direction to its predecessor.
  • the direction of rotation of the rotating cylinders is denoted by the reference number 18.
  • Figure 3 shows a section, taken along line A-A of Figure 2, of a rotating cylinder 3 with its back shaped as a radial fan in the form of a ventilator rotor 4. Behind the edge of the rotating cylinder 3 and the chamfered orifice plate 5 there are blowing nozzles 6 that ⁇ gmeTate ⁇ the ⁇ axral ⁇ a ⁇
  • a coaxial, swirling blow- in air flow 14 Said orifice plate 5 can be placed behind the ventilator rotor 4, or it can partially overlap the rotor blades 17 in which case the ventilator rotor 4 outer diameter must be less than the inner diameter 21 of said orifice plate 5.
  • Rotor blades 17 may be uncovered or partly covered by a radial cover 27 so that said cover is attached to said blades and does not extend beyond the outer diameter 15 of the ventilator rotor 4 body.
  • the radial-axial air flow 13 is generated by the radial fan in the form of a ventilator rotor 4.
  • the blow-in flow 14 transports the mineral fibers 7, previously torn by the centrifugal force off the film 19 of mineral melt.
  • the swirling component of the blow-in air flow 14 determines a better dispersion of the binder, a better and more uniform wetting of the mineral fibers 7 by the binder, it affects the definitive forming and solidification of the mineral fibers 7 out of the mineral melt 10, and induces a better and more uniform mutual intertwining of the mineral fibers 7.
  • Direction of air flow can be observed, said air coming to backward facing (upstream facing) edge of said rotating wheel at an angle relative to axis of said rotating wheel and not (as in state of the art) generally parallel direction.
  • Figure 4 shows an embodiment of the radial fan in the form of a ventilator rotor 4.
  • the body of the ventilator rotor 4 is circular in form and thinner at the edge (i.e., at the outer radius 15), thickening inwards (i.e., toward the inner radius 16).
  • blades 17, the working faces of which are parallel to the rotation axis of the rotating cylinders 3 and have a given inclination between 0° and 45° to the radial direction.
  • the blades 17 bend slightly in the direction opposite to the direction of rotation 18 of the rotating cylinder 3.
  • the blades 17 extend beyond the outer radius 15 of the body of ventilator rotor 4 where they operate in a manner typical for axial radial fans. Said section of blades 17 which extends at the radius greater than the radial fan body outer radius 15 and lower than the duct inner radius 20 may be spatially curved around the radial axis to attain optimal aerodynamic efficiency of said ventilator rotor 4.
  • Figure 5 shows a concentric, chamfered orifice plate 5 located between the blowing nozzles and the ventilator rotor 4.
  • the outer diameter 20 of said orifice plate is equal to the ⁇ irm3 ⁇ 4ridiam " eter “ of " sardnduct
  • Orifice plate length is denoted by position 22 while positions 23 and 24 denote the first and the second chamfer angle.
  • Said orifice plate 5 is geometrically defined as a solid of revolution of the chamfered cross section 25 about the symmetry axis 26 for an angle of revolution greater than 0° and up to 360°, depending on the shaping of air duct 9. For said angle of revolution of 360°, the orifice plate forms a full circle as shown in Fig. 5 whereas for said angle of revolution of less than 360°, said orifice plate forms a partial circular section.
  • Figure 6 shows said rotating cylinder comprising backward facing chamfered edge i.e. chamfered edge facing upstream direction of air flow, said chamfered rotating cylinder in preferred embodiment comprising flow deflecting chamfer 28, inside part of the duct 29, flow deflecting chamfer angle 30, horizontal distance from end of the flow deflecting chamfer to the end of a duct 31 , back outside diameter of rotating cylinder 32, horizontal distance from back of the rotating cylinder to the start of the flow deflecting chamfer 33, inside diameter of outside part of a duct 34, outside diameter of inside part of a duct 35.
  • Figure shows streaklines of air flow which are no longer parallel as known in state of the art to surface of said rotating cylinder at backward facing edge of said rotating cylinder but rather coming at an angle relative to axis of said rotating cylinder.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

L'invention concerne un procédé de production de laine minérale résolvant un problème technique de difficulté à atteindre : un feutrage bon et uniforme des fibres minérales ; une humidification bonne et uniforme des fibres minérales par le liant ; un déchirement de la couche primaire une fois déposée sur la grille d'accumulation ; ainsi qu'un arrachage des fragments fondus de matériaux d'un cylindre rotatif provoquant une perte de matière et une diminution de la productivité, par une manipulation d'un flux d'air autour dudit cylindre rotatif de sorte que l'air s'écoule au-delà d'un bord orienté vers l'arrière dudit cylindre rotatif selon un angle par rapport à l'axe dudit cylindre rotatif. Ceci peut être réalisé soit par façonnage du bord des cylindres rotatifs en chanfreinant le bord du cylindre rotatif faisant face à la direction amont du flux d'air, soit par ajout d'un ventilateur radial au cylindre rotatif, c'est-à-dire au côté du cylindre rotatif orienté vers la direction amont du flux d'air.
PCT/SI2014/000054 2014-09-25 2014-09-25 Procédé et dispositif de production de fibres de laine minérale WO2016048249A1 (fr)

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PCT/SI2014/000054 WO2016048249A1 (fr) 2014-09-25 2014-09-25 Procédé et dispositif de production de fibres de laine minérale

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PCT/SI2014/000054 WO2016048249A1 (fr) 2014-09-25 2014-09-25 Procédé et dispositif de production de fibres de laine minérale

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019199236A1 (fr) 2018-04-11 2019-10-17 Izoteh D.O.O. Appareil de défibrage comprenant des roues tournantes et procédé de défibrage par fusion

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990015032A1 (fr) * 1989-06-07 1990-12-13 Oy Partek Ab Unite de roue a filer de transformation en fibres d'une coulee minerale au moyen de forces centrifuges
US5116397A (en) * 1987-04-06 1992-05-26 Oy Partek Ab Fibrillation device for the manufacture of mineral wool
US5131935A (en) * 1990-01-16 1992-07-21 Isover Saint-Gobain Method and apparatus for fibring mineral wool by free centrifugation
WO1993013025A1 (fr) 1992-01-02 1993-07-08 Paroc Oy Ab Procede et appareil de formation de la bande principale d'une natte de fibres minerales
WO1995014135A1 (fr) 1993-11-08 1995-05-26 Rockwool International A/S Procede de production d'un tissu non tisse de fibres minerales, installation de production d'un tissu non tisse de fibres minerales, et produit a base de fibres minerales
WO1996016912A1 (fr) 1994-12-01 1996-06-06 Rockwool International A/S Fabrication de produits a base de fibres vitreuses
WO1999059929A1 (fr) 1998-05-20 1999-11-25 Termo, D.D., Industrija Termicnih Izolačij, Škofja Loka Dispositif de production de laine de roche equipe de cylindres rotatifs ayant une partie avant formee

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5116397A (en) * 1987-04-06 1992-05-26 Oy Partek Ab Fibrillation device for the manufacture of mineral wool
WO1990015032A1 (fr) * 1989-06-07 1990-12-13 Oy Partek Ab Unite de roue a filer de transformation en fibres d'une coulee minerale au moyen de forces centrifuges
US5131935A (en) * 1990-01-16 1992-07-21 Isover Saint-Gobain Method and apparatus for fibring mineral wool by free centrifugation
WO1993013025A1 (fr) 1992-01-02 1993-07-08 Paroc Oy Ab Procede et appareil de formation de la bande principale d'une natte de fibres minerales
WO1995014135A1 (fr) 1993-11-08 1995-05-26 Rockwool International A/S Procede de production d'un tissu non tisse de fibres minerales, installation de production d'un tissu non tisse de fibres minerales, et produit a base de fibres minerales
WO1996016912A1 (fr) 1994-12-01 1996-06-06 Rockwool International A/S Fabrication de produits a base de fibres vitreuses
WO1999059929A1 (fr) 1998-05-20 1999-11-25 Termo, D.D., Industrija Termicnih Izolačij, Škofja Loka Dispositif de production de laine de roche equipe de cylindres rotatifs ayant une partie avant formee

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019199236A1 (fr) 2018-04-11 2019-10-17 Izoteh D.O.O. Appareil de défibrage comprenant des roues tournantes et procédé de défibrage par fusion

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