WO2015116005A1 - Appareil de fibrage et procédé de fibrage par fusion - Google Patents

Appareil de fibrage et procédé de fibrage par fusion Download PDF

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Publication number
WO2015116005A1
WO2015116005A1 PCT/SI2014/000004 SI2014000004W WO2015116005A1 WO 2015116005 A1 WO2015116005 A1 WO 2015116005A1 SI 2014000004 W SI2014000004 W SI 2014000004W WO 2015116005 A1 WO2015116005 A1 WO 2015116005A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotating wheel
melt
rotating
wheels
wheel
Prior art date
Application number
PCT/SI2014/000004
Other languages
English (en)
Inventor
Sašo DOLENC
Jurij DEMŠAR
Aljaž ULAGA
David ŠTREMFELJ
Francelj TRDIČ
Jure MARN
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/SI2014/000004 priority Critical patent/WO2015116005A1/fr
Publication of WO2015116005A1 publication Critical patent/WO2015116005A1/fr

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
    • 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
    • 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
    • C03B37/07—Controlling or regulating
    • 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
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • This invention addresses technical problem responding to change in characteristics of a melt cascade (for purposes of this invention this term describing melt in either droplets, or streams, or rivulets, or other type of flow cascading from furnace or like through melt vessel, and onto rotating wheel or plurality thereof, and between said rotating wheels) which is formed in production of mineral fiber (so called , mineral wool as known in state of the art being stone wool slag wool or other type of mineral wool).
  • This production comprises mainly of pouring of melt, preferably in form of a jet or a stream, said melt comprising material to be solidified into fiber, onto said rotating wheels(in state of the art also known as rotors) comprising of a first rotating wheel where melt is to be solidified (at least in part) in form of fibers which are blown off said, rotating wheel, remainder to be passed to the second rotating wheel and thrown back onto the first rotating wheel and to third rotating wheel and so forth (of course assuming that there are more than one rotating wheel).
  • a typical fiberizing apparatus in state of the art is described in EP 1409423.
  • fiberizing apparatus is customary connected to a collecting chamber for collecting mineral fiber, usually equipped with some sort of mechanism for collecting mineral fiber, preferably conveyer belt.
  • the mineral melt discharged from the melting furnace or similar device for heating up and melting raw materials used in mineral wool formation forms a nearly vertical melt stream as it is poured onto the spinning machine.
  • the melt stream is directed towards the mantle surface of the first wheel where it partly adheres to the surface, is drawn in motion and forms a melt film.
  • a part of the melt forms, with the aid of the centrifugal force, liquid ligaments that solidify to the mineral wool fibers while the remaining quantity of the melt is thrown out as a cascade of drops against the mantle surface of the adjacent second wheel in the series.
  • a part of the melt adheres to the second wheel surface sufficiently to be formed into fibers and the remainder is thrown onto the mantle surface of the third wheel of the spinner machine and so forth, until the last wheel where the remaining mass flow of the melt is assumed to be low enough to fiberize completely.
  • Binder may be applied on the formed mineral fibers, either during fiber formation or afterwards, in form of a droplet spray.
  • the mineral fibers formed on the wheels of the spinning machine are transported away from the point of origin on the melt film, initially in the radial direction due to the centrifugal force.
  • the fibers As the fibers enter the zone of the coaxial air flow generated by the spinning machine fan, i.e. the blow-in flow, they are drawn in predominantly axial motion and transported to the collecting chamber where the primary layer of the mineral wool is formed.
  • EP0567486 describes fiberizing apparatus for forming mineral wool and a process using that apparatus.
  • the apparatus comprises a set of at least three rotors mounted for rotation about respective horizontal axes. Melt is poured onto the top rotor and thrown onto subsequent rotors in turn with the result that fibres are thrown off.
  • the rotors all rotate to give an acceleration field of at least 50 km/s2, and are spacially arranged in respect to one another so that a line drawn from the axis of the first rotor to the axis of the second rotor makes an angle of 0-20° below the horizontal.
  • EP0567486 further describes several experiments related to various angles between rotating wheels.
  • PCT/SI2013/000055 presents steps of determining (a) trajectory of movement of melt stream, (b) melt concentration relative to surrounding air between the first and the second rotating wheels, and (c) movement vector, and further by regulating of movement of melt stream (i.e. drop mass), said regulation mostly achieved through variation in point of contact of melt and rotating wheel or plurality thereof.
  • This is achieved by determining three key parameters: (a) trajectory of movement of melt stream, (b) melt concentration relative to surrounding air between the first and the second rotating wheels, and (c) movement vector, and further by analyzing these three keys.
  • Fiberizing apparatus and method of melt fiberization solve above referenced technical problem of responding to change in characteristics of a melt cascade (for purposes of this invention this term describing melt in either droplets, or streams, or rivulets, or other type of flow cascading from furnace or like through melt vessel, and onto rotating wheel or plurality thereof, and between said rotating wheels) by responding to changes in product output, or, analysis of (a) trajectory of movement of melt stream, (b) melt concentration relative to surrounding air between the first and the second rotating wheels, and (c) movement vector by changing geometrical setup of the rotating wheels in rotating wheel setup according to this invention, or some other indication of effectiveness of fiberizing process. It should be mentioned, from the onset, that this invention relates to any number of rotating wheels, from single, to any number.
  • An apparatus comprised of rotating wheels for melt fiberization (fiber production) comprises number of regulating parameters once amount of melt has been selected. These regulating parameters comprise point of impact of a melt onto the first rotating wheel and position of each rotating wheel relative to each other.
  • the first rotating wheel according to this invention is therefore a wheel onto which melt impinges once introduced into the centrifuge. Additional parameter is size of each rotating wheel. Yet another parameter is angle of attack (angle of impingement) onto the rotating wheel.
  • each such apparatus can be measured.
  • stone wool or rock wool, or mineral wool, or somesuch
  • the properties of its fibers are not uniform.
  • the input material is not uniform.
  • Reason for such approach is in fact that for insulating properties, the properties of fiber can vary for quite a degree without affecting insulation properties - fiber (as well known) serves single most important purpose: to trap air.
  • the solution to this problem offered by this invention is creation of a centrifuge where each of the rotating wheels can be independently positioned. This can be achieved in number of ways, from position screws, to hydraulic position devices, to arc position devices or ex-center position devices swinging said rotating wheel about particular position etc. etc.
  • subject of this invention is fiberizing apparatus comprising at least two rotating wheels for forming mineral melt into fibers characterized in that it further comprises positioning means for independent positioning of at least one of said rotating wheels about pre-set position, or at least one replacement rotating wheel for replacing at least rotating wheel with that of different diameter, or both positioning means and at least one replacement rotating wheel, as well as feedback means for adjusting position of at least one of said rotating wheels in such a way to maximize effectiveness of fiber production of said fiberizing apparatus.
  • Positioning of each of said rotating wheels can take place either during operation of said centrifuge, or during maintenance periods or some other periods during which said rotating wheels do not move, and based on data acquired during operation. Positioning is dependent on type of positioning device, and is achieved, for example, by turning and securing positioning screws, or extending or retracting hydraulic positioning means, or swinging said rotating wheel about center of rotation or turning ex-center positioning device or similar.
  • Another possibility is to change size (diameter) of at least one rotating wheel. By changing the diameter one can change the perimeter velocity resulting in different force acting on the melt. This directly influences fiber formation.
  • Feedback means refer to means for detecting effectiveness of an operation. These means my include, inter alia, weighing device attached to said fiberizing apparatus for measuring weight of input material and weighing device attached to said fiberizing apparatus for measuring weight of output material, or device capable of analysis of (a) trajectory of movement of melt stream, (b) melt concentration relative to surrounding air between the first and the second rotating wheels, and (c) movement vector of melt stream.
  • each rotating wheel is expressed as a vector.
  • the Cartesian coordinate system is positioned in a centre of the first rotating wheel in such a way that "y" direction is essentially collinear with melt trajectory before contact with the first wheel, and in direction contrary to melt flow, and "x" direction perpendicular to "y” direction in clockwise fashion.
  • optimizing parameter is weighted combination of two sub-parameters surface area of quadrilateral with vertices in centers of rotating wheels, preferably x2(yl-y3)-y2(xl-x3), and sum of square of distances between each rotating wheel center without the first rotating wheel center, and the firs rotating wheel center, preferably Xl*xl+x2*x2+x3*x3+yl *yl+y2*y2+y3*y3
  • Weighting can be simple, for example, averaging as:
  • this parameter can be slightly reformulated to allow for easier manipulation, i.e.
  • This change of fiber production should be measured over some predetermined period of time, and time averaged. Changes of position of the wheels resulting in changed fiber production should be repeated until such time that the average fiber production is maximum over some preset period of time which is significantly (preferably 10 times longer) than predetermined period of time necessary for averaging fiber production.
  • the invention according to this embodiment is therefore fiberizing apparatus comprised of four rotating wheels wherein the coordinates of the second rotating wheel are (xl, yl), of the third rotating wheel are (x2, y2), and of the fourth rotating wheel are (x3, y3), and fiber production is monitored in relation to parameter calculated as weighted combination of area between centers of rotating wheels, preferably x2(yl-y3)-y2(xl- x3), and square of absolute value of sum of square of absolute values of all three distances between coordinate of center of each wheel except the first wheel, and the center of the first wheel, preferably xl*xl+x2*x2+x3*x3+yl *yl+y2*y2+y3*y3, such combination preferably calculated as 0,5* (x2(yl-y3)-y2(xl-x3)) + Xl *xl+x2*x2+x3*x3+yl *yl+y2*y2+y3*y3, such combination even more preferably
  • the subject of this invention is also method of melt fiberization taking advantage of fiberizing apparatus according to this invention, and comprising the steps of: a. determining efficiency of melt fiberization;
  • d. perform one of the steps consisting of the following group: i. if decrease of efficiency was detected, returning to previous position of at least one rotating wheel, or previous size of replaced rotating wheel, or
  • Method for optimization for any given rotating wheel can be constructed comprising the following steps:
  • Essentially local maximum means that local maximum is reached within predetermined tolerance, usually 2% based on mass flow of mineral fiber exiting the collecting chamber.
  • angle of attack angle of impingement
  • Deflected portion of the melt from wheel 2 will be directed toward area between the wheels 1 and 2, or back to the wheel 1 determined by position of wheel 2. Same applies to wheel 3, etc. depending on number of the wheels.
  • the ratio between portion of the melt sticking to the rim of the rotating wheel 2 (and other wheels), and deflected portion is important as:
  • overburdened rotating wheel means that the concentration (quantity of the melt on the wheel) is too large - meaning that shear, between air and melt cannot entrain whole surface of the film resulting in larger amounts of melt torn from the film resulting in non-formation of fibers and increase of shot under the centrifuge. At the same time not enough melt is transported to the rest of the wheels again resulting in lower productivity;
  • Fig. 1 shows four rotating wheel setup comprising the first rotating wheel (1), the second rotating wheel (2), the third rotating wheel (3), the fourth rotating wheel (4), melt container (5), melt (6) cascading through said wheels, position of the first rotating wheel (xO, yO), position of the second rotating wheel (xl, yl), position of the third rotating wheel (x2, y2), position of the fourth rotating wheel (x3, y3).
  • Fig. 2 shows example of two rotating wheel changing position in four rotating wheel setup (changed position in dashed lines) comprising the first rotating wheel (1), the second rotating wheel (2), the third rotating wheel (3), the fourth rotating wheel (4), melt container (5), melt (6) cascading through said wheels, position of the first rotating wheel (xO, yO), position of the second rotating wheel (xl, yl), position of the third rotating wheel (x2, y2), position of the third rotating wheel ( ⁇ 2', y2') after changing position, position of the fourth rotating wheel (x3, y3), position of the fourth rotating wheel ( ⁇ 3', y3') after changing position.
  • Fig. 3 shows four rotating wheel setup including schematics of collecting chamber comprising the first rotating wheel (1), the second rotating wheel (2), the third rotating wheel (3), the fourth rotating wheel (4), melt container (5), melt (6) cascading through said wheels, mineral fibers (7), direction of mineral fiber exiting collecting chamber (8), scale for weighing mineral fiber exiting collecting chamber (9), conveyer belt (10), camera (11).
  • Fig. 4 shows approximate effects of rotating wheel position change (changed position in dashed lines) on melt cascading through the centrifuge comprising the first rotating wheel (1), the second rotating wheel (2), the third rotating wheel (3), the fourth rotating wheel (4), melt container (5), melt (6) cascading through said wheels.
  • Fig. 5 shows four rotating wheel setup in which all four rotating wheels were increased in size (denoted with dashed lines), comprising the first rotating wheel (1), the second rotating wheel (2), the third rotating wheel (3), the fourth rotating wheel (4), melt container (5), melt (6) cascading through said wheels, position of the first rotating wheel ( ⁇ , yO), position of the second rotating wheel (xl, yl), position of the third rotating wheel (x2, y2), position of the fourth rotating wheel (x3, y3).
  • all four rotating wheels namely the first rotating wheel (1), the second rotating wheel (2), the third rotating wheel (3), the fourth rotating wheel (4) are in their initial positions: position of the first rotating wheel (xO, yO), position of the second rotating wheel (xl, yl), position of the third rotating wheel (x2, y2), position of the fourth rotating wheel (x3, y3).
  • the fiberized melt in forms of mineral fibers (7) collects in the collecting chamber and is transported out of the collecting chamber by means of conveyer belt (10). On the top, there is a weighing station comprising scale for weighing mineral fiber exiting collecting chamber (9). These data are of course translated into mass flow data using basic physical properties, or used in its original form. Similar process is performed at the input side, either continuously, or in batch alternative depending on the type of process used to feed the furnace for melting mineral. Data from continuous measuring are transmitted to processor evaluating effectiveness of a process.
  • This effectiveness is in preferred embodiment performed by either comparing mass flow of mineral fibers exiting the collecting chamber as a result of data obtained by scale for weighing mineral fiber exiting collecting chamber (9) relative do mass flow of material fed into the furnace and/or method as described in PCT/SI2013/000055 using camera (1 1) comprising analysis of (a) trajectory of movement of melt stream, (b) melt concentration relative to surrounding air between the first and the second rotating wheels, and (c) movement vector.
  • the position of rotating wheels are then changed.
  • the first rotating wheel (1) does not change its position.
  • the optimization process in this, preferred, embodiment is started by the second wheel (2) moving in -x direction for predetermined amount, preferably 2 mm.
  • the third wheel (3) is moved for predetermined amount in -x direction, preferably 2 mm.
  • the fourth wheel (4) is 4 000004

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

Abstract

L'invention concerne un appareil et un procédé de fibrage qui résolvent un problème technique susmentionné de réponse à un changement de caractéristiques d'une cascade de matière fondue (aux fins de cette invention, ce terme décrit de la matière fondue en gouttelettes, en flux ou en ruisselet, ou un autre type d'écoulement tombant en cascade d'un four ou analogue, par l'intermédiaire d'un récipient de matière fondue, sur une ou plusieurs roues en rotation, et entre lesdites roues en rotation) par réponse à des changements dans une sortie de produit, ou analyse (a) de la trajectoire de mouvement du flux de matière fondue, (b) de la concentration de la matière fondue par rapport à l'air ambiant entre les première et deuxième roues en rotation, et (c) du vecteur de mouvement par changement de l'agencement géométrique des roues en rotation dans un agencement de roues en rotation selon cette invention, ou une certaine autre indication d'efficacité du processus de fibrage.
PCT/SI2014/000004 2014-01-31 2014-01-31 Appareil de fibrage et procédé de fibrage par fusion WO2015116005A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SI2014/000004 WO2015116005A1 (fr) 2014-01-31 2014-01-31 Appareil de fibrage et procédé de fibrage par fusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SI2014/000004 WO2015116005A1 (fr) 2014-01-31 2014-01-31 Appareil de fibrage et procédé de fibrage par fusion

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WO2015116005A1 true WO2015116005A1 (fr) 2015-08-06

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622341A1 (fr) * 1993-04-29 1994-11-02 Isover Saint-Gobain Procédé et dispositif pour la détermination de la position d'un jet de matière en fusion
WO2004000742A2 (fr) * 2002-06-24 2003-12-31 Rockwool International A/S Procede et appareil destines a fabriquer de la laine minerale

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622341A1 (fr) * 1993-04-29 1994-11-02 Isover Saint-Gobain Procédé et dispositif pour la détermination de la position d'un jet de matière en fusion
WO2004000742A2 (fr) * 2002-06-24 2003-12-31 Rockwool International A/S Procede et appareil destines a fabriquer de la laine minerale

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