• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a device for producing expanded mineral granules with a heated processing channel (1) for the mineral granules fed into a conveying flow (13). In order to design a device of the type described at the outset in such a way that a continuous, qualitatively controllable manufacturing process is achieved, it is proposed that an inflow opening (4) is provided in the processing channel (1) to form a granulate-free laminar flow (5) running along the inside of the processing channel ,
    公开号:AT521346A4
    申请号:T50367/2018
    申请日:2018-05-02
    公开日:2020-01-15
    发明作者:
    申请人:Dipl Ing Johannes Pohl；
    IPC主号:
    专利说明:

    Summary
    The invention relates to a device for producing expanded mineral granules with a heated processing channel (1) for the mineral granules fed into a conveying flow (13). In order to design a device of the type described at the outset in such a way that a continuous, qualitatively controllable manufacturing process is achieved, it is proposed that an inflow opening (4) is provided in the processing channel (1) to form a granulate-free laminar flow (5) running along the inside of the processing channel ,
    (Fig. 1) / 13 (41935) KA
    The invention relates to a device for producing expanded mineral granules with a heated processing channel for the mineral granules fed into a conveying flow.
    Devices for expanding mineral material are known from the prior art, which have a heated processing channel for the mineral granulate (WO 2016/191788 A1). The mineral granules supplied are fed into a conveying flow, heated to a critical temperature along a conveying path in the processing channel and consequently expanded, after which the expanded granules are conveyed out of the processing channel by the conveying flow. However, it is disadvantageous that the heated material has a softened and adhesive surface and can therefore adhere to the inner wall of the processing channel. The consequence of this is that the manufacturing process must be interrupted regularly in order to be able to carry out maintenance and cleaning work on the inside of the processing channel, since otherwise the effective heating power of the device would be subject to permanent fluctuation due to the adhesive layer which forms and acts as an insulator. This effect is intensified by turbulence in the flow in the processing channel, such as that caused by internals, and can lead to a complete closure of the processing channel.
    The invention is therefore based on the object of designing a device of the type described at the outset in such a way that a continuous, qualitatively controllable production process is achieved.
    2.13
    The invention achieves the stated object in that an inflow opening is provided in the processing channel to form a granulate-free laminar flow running along the inner wall of the processing channel.
    These features enable a laminar flow to be applied to the inner wall of the processing channel when the process medium is introduced through the inflow opening. Because the laminar flow acts as a kind of air curtain, mixing between the granulate-free laminar flow and the granulate-conveying flow is largely avoided. This significantly reduces the adherence of expanded mineral granulate particles to the inner wall of the processing channel. The process medium which is introduced into the processing channel to form the laminar flow can basically have different gas compositions, with air being selected as the process medium in the simplest case. The inflow opening can be formed in a variety of ways. For example, it can be provided that a feed line guiding the process medium opens into the processing channel in such a way that the opening inflow opening axis runs parallel to the direction of the flow of the delivery, wherein in principle several inflow openings can also be provided. Particularly favorable flow conditions result, however, if a circumferential inflow opening is provided. Although the inflow opening basically represents a current-disrupting interruption of the processing channel, any flow turbulence can be reduced to a negligible level by the process medium entry according to the invention via the inflow opening. With regard to the flow directions of laminar and conveying flow, the device according to the invention can be operated both in countercurrent and in cocurrent processes. In the countercurrent process, the process medium is introduced into the processing channel counter to the direction of flow, which not only reduces the adherence of the extracted mineral granulate, but also keeps mineral granulate particles away from the inflow opening and thus reduces the risk of the inflow opening being closed. Particle sizes above 100 μm are particularly suitable, since the mineral granulate particles are conveyed in the countercurrent process essentially due to gravity.
    3/13 whereby a supporting medium can also be introduced into the flow. In the case of the direct current method, which is particularly suitable for particle sizes below ΙΟΟμιτι, the conveying flow is supported both in its conveying effect by the laminar flow running in the same direction, and also displaced the conveying flow radially inward by the laminar flow, so that adherence of mineral granules to the inner wall of the processing channel is also reduced here , Even if the cross-sectional geometry of the processing channel itself can be freely selected, there are favorable process conditions with a circularly selected channel cross-section.
    In order to further reduce the adherence of expanded mineral granulate particles to the inner wall of the processing channel, it is proposed that the cross section of the processing channel widens in the area of the inflow opening in the inflow direction of the laminar flow. As a result, the inflow opening no longer has to protrude radially into the region of the delivery flow in the processing channel, but can, for example, open into the region in the region outside the channel section preceding in the direction of delivery into the processing channel. Thus, the risk of flow turbulence due to a channel wall unevenness protruding into the delivery flow can be further reduced, which favors the formation of the laminar flow and further reduces the adherence of expanded mineral granulate particles. In addition, due to the arrangement of the inflow openings in a region radially outside of the flow of the conveying flow and the air curtain which thereby acts better, a closure of the inflow openings by mineral granules adhering there is avoided, which in particular further improves the process conditions in the countercurrent process because the laminar flow increases the processing channel volume resulting from the cross-sectional expansion fills.
    In order nevertheless to be able to easily carry out any necessary cleaning or maintenance work on the device according to the invention, it can be provided that the processing channel is arranged interchangeably in an oven shaft. As a result of these measures, the processing channel can be cleaned
    4/13 removed from the furnace shaft and then reinserted or replaced if damaged or after reaching the service life. In addition, this enables a modular structure of the device, so that operation can be carried out either in the countercurrent process or in the cocurrent process, by means of only minor conversion work on the device itself.
    Particularly favorable structural conditions and process conditions result when the processing duct comprises two duct sections with a different cross-section, the duct section with a smaller cross-section projecting into the duct section with a larger cross-section, forming the inflow opening. The channel sections can each be aligned coaxially with respect to their longitudinal axis and parallel to the direction of flow, whereby the channel section with a smaller cross-section can be enclosed by the channel section with a larger cross-section such that an inflow opening that completely surrounds the projecting area of the smaller channel section without additional trains the necessary construction measures. As a result, the laminar flow can apply to the inner wall of the processing channel in a circumferential and essentially uninterrupted manner. In addition, an inlet channel running parallel to the flow direction can be formed for the process medium flowing into the processing channel, depending on how far the channel section with a smaller cross section projects into the channel section with a larger cross section. This further promotes the formation of the laminar flow.
    In order to further reduce adherence of the mineral granulate by the laminar flow lying against the inner wall of the processing channel, the process medium of the laminar flow can have a viscosity which differs from the process medium of the conveying flow. Because the laminar flow and the conveying flow have a different viscosity, boundary layer turbulence between the laminar flow and the conveying flow is reduced, as a result of which the expansion of the air curtain which is formed is extended in the longitudinal direction of the channel with the same inflow parameters. The viscosity can be over Pro
    5/13 process parameters such as temperature or flow rate of the process media of laminar or conveying flow can be set.
    The viscosity of the process medium of the laminar flow can also be set in a favorable manner if heating elements for the processing channel are arranged in a supply area for the laminar flow surrounding the processing channel. As a result of these measures, the process medium forming the laminar flow is led through the feed area before it is led into the processing channel via the inflow opening. Depending on the selected inflow speed of the process medium into the supply area, the heat input into the process medium via the heating elements and consequently its viscosity can be adjusted. A particular advantage is that the heating elements only have to provide a temperature profile required for the isenthalpic expansion process of the mineral granulate, and thus the process medium for the laminar flow does not require a separate heating device or a separate temperature profile in order to adjust the viscosity of the process medium.
    The subject matter of the invention is shown in the drawing, for example. Show it
    1 shows a schematic section of a device according to the invention with material insertion at the top and material discharge at the foot during DC operation,
    Fig. 2 is a representation corresponding to Fig. 1 of a device according to the invention with foot-side material entry and head-side material discharge in counterflow operation.
    A device according to the invention has a processing channel 1. The processing channel 1 is arranged in a furnace shaft 3 comprising a heat insulation jacket 2. In the processing channel, an inflow opening 4 according to the invention is provided to form a granulate-free laminar flow 5 running along the inside of the processing channel.
    13.6
    The mineral granulate, which can be based, for example, on expandable volcanic glass, is introduced via a feed device 6, which in the embodiment of FIG. 1 is assigned to a head part 7 adjoining the processing channel 1. The mineral granulate, on the other hand, is discharged via an extraction area 9 assigned to a foot part 8, wherein the extraction can be supported by the supply of additional cooling air 10.
    The laminar flow 5 is fed to the processing channel 1 via feed openings provided in the furnace shaft 3, the head part 7 also having a draw-off area 12 for the laminar flow 5 running upwards along the inner wall of the processing channel. The laminar flow 5 forms a kind of air curtain that does not mix with the granulate-conveying flow 13 and thus largely prevents the softened granulate from adhering to the inner wall of the processing channel. The laminar flow 5 can also be preheated, so that an additional chimney effect is created which further promotes the ascent and application of the laminar flow 5 to the processing channel inner wall.
    The embodiment of a device according to the invention shown in FIG. 1 is particularly suitable for particle sizes over 100 μm, especially since in this case the granulate particles are conveyed through the processing channel 1 due to gravity. The laminar flow 5 and the granulate-conveying flow 13 run in the processing channel 1 in opposite flow directions. The residence time of the particles in the processing channel 1 can be set, for example, via the inflow speed of the laminar flow 5 or an additionally provided suction in the extraction area 12.
    The embodiment shown in Fig. 2 is particularly suitable for particle sizes below ΙΟΟμιτι. The laminar flow 5 and the granulate-conveying flow 8 have the same flow direction in the processing channel 1. In this embodiment, the granulate particles are fed in via a feed device 6 assigned to the base part 8 by means of blown-in process air 14 as the process medium
    7/13 introduced processing channel 1. The dwell time of the particles in the processing channel 1 can in turn be adjusted via the inflow speed of the laminar flow 5, the inflow speed of the process air 14 or via an extraction device provided in an extraction area 12 assigned to the head part 7. In addition, additional cooling air 15 can be introduced into the head part 7.
    Particularly favorable structural conditions result if the cross section of the processing channel 1 widens in the inflow direction 2 in the inflow direction of the laminar flow 5, in particular if the processing channel 1 comprises two channel sections 16 and 17 with a different cross section, the channel section 16 having a smaller cross section protrudes into the channel section 17 with a larger cross section, forming the inflow opening 4. The channel sections 16 and 17 can each have a circular cross section and can be aligned coaxially with respect to their longitudinal axis, the channel section 16 being partially pushed into the channel section 17. The cross-sectional geometry of the processing channel 1 or the channel sections 16 and 17 can be freely selected per se, with particularly favorable process conditions occurring with a circular cross-section. According to one embodiment, it can also be provided that the processing channel 1 or the channel sections 16 and 17 are formed by a suitable, heat-resistant film.
    It can also be provided that the laminar flow 5 discharged via the extraction area 12 is fed to a heat exchanger, for example for heat recovery, so that the process heat can in turn be released to a newly supplied process air 18 forming the laminar flow 5.
    The processing channel 1 can be arranged interchangeably in the furnace shaft 3, so that, for example, the channel sections 16 and 17 can be removed individually or together from the furnace shaft 3 in order to simplify any necessary maintenance work, or else the processing channel 1 or
    8/13 to be able to replace the duct sections 16 and 17. Likewise, the head part 7 and the foot part 8 can each be interchangeably attached to the processing channel 1 and / or the furnace shaft 3, so that a modular construction of the device is made possible, which can be adapted depending on the application. As a result, it is possible to switch, for example, between a countercurrent process according to FIG. 1 and a direct current process according to FIG. 2 or between a process with particle sizes over 100 μm and under ΙΟΟμιτι by only minor conversion work or by simply exchanging the head part 7 with the foot part 8
    The device can have a feed area 19 for the laminar flow 5 surrounding the processing channel 1. In the feed area 19, heating elements 20 for the processing channel 1 can be arranged, which then simultaneously serve to heat the laminar flow 5. The heat input into the laminar flow can be set, for example, via the inflow speed of the process air 18 forming the laminar flow 5 into the feed area 19.
    9/13
    patent attorneys
    Dipl.-Ing. Helmut Hübscher
    Dipl.-Ing. Gerd pretty
    Dipl.-Ing. Karl Winfried Hellmich
    Spittelwiese 4, 4020 Linz (41935) KA
    权利要求:
    Claims (6)
    [1]
    claims
    1. Device for producing expanded mineral granules with a heated processing channel (1) for the mineral granules given up to a conveying flow (13), characterized in that in the processing channel (1) an inflow opening (4) for forming a granulate-free laminar flow running along the inner wall of the processing channel ( 5) is provided.
    [2]
    2. Device according to claim 1, characterized in that the cross section of the processing channel (1) in the region of the inflow opening (4) widens in the inflow direction of the laminar flow (5).
    [3]
    3. Device according to claim 1 or 2, characterized in that the processing channel (1) is interchangeably arranged in an oven shaft (3).
    [4]
    4. Device according to one of claims 1 to 3, characterized in that the processing channel (1) comprises two channel sections (16), (17) with a different cross-section, the channel section (16) with a smaller cross-section, forming the inflow opening (4th ) protrudes into the channel section (17) with a larger cross section.
    [5]
    5. Device according to one of claims 1 to 4, characterized in that the process medium of the laminar flow (5) has a different viscosity from the process medium of the conveying flow (13).
    10/13
    [6]
    6. Device according to one of claims 1 to 5, characterized in that heating elements (20) for the processing channel (1) are arranged in a feed area (19) surrounding the processing channel (1) for the laminar flow (5).
    11/13

    12/13

    13/13
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    同族专利:
    公开号 | 公开日
    US20210396471A1|2021-12-23|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2431884A|1943-08-31|1947-12-02|Neuschotz Robert|Method of expanding pearlite|
    FR2268227A1|1974-04-22|1975-11-14|Alary Maurice|Flame stabiliser for central heating burner - has conical air inlet meshes forming laminar air flow|
    US4512736A|1981-12-23|1985-04-23|Deutsche Perlite Gmbh|Apparatus for the expansion of mineral matter, especially perlite and vermiculite|
    WO1992006051A1|1990-10-02|1992-04-16|Proizvodstvennoe Obiedinenie 'kovdorsljuda'|Method and device for swelling granular material|
    WO2013053635A1|2011-10-10|2013-04-18|Binder + Co Ag|Method for the closed-cell expansion of mineral material|
    WO2016191788A1|2015-06-03|2016-12-08|Binder + Co Ag|Method and device for producing an expanded granulate|
    FR1420639A|1963-11-23|1965-12-10|Portland Cementfabrik Germania|Process for the manufacture of a swollen product based on clay and siliceous materials|
    US4347155A|1976-12-27|1982-08-31|Manville Service Corporation|Energy efficient perlite expansion process|
    US20070275335A1|2006-05-25|2007-11-29|Giang Biscan|Furnace for heating particles|
    EP2708517B1|2012-09-13|2017-06-28|Binder + Co Aktiengesellschaft|Method for the preparation of foamed glass|WO2022037796A1|2020-08-21|2022-02-24|Binder + Co Ag|Device for producing expanded granulated material|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50367/2018A|AT521346B1|2018-05-02|2018-05-02|Device for producing expanded mineral granules|ATA50367/2018A| AT521346B1|2018-05-02|2018-05-02|Device for producing expanded mineral granules|
    EP19724333.0A| EP3788015A1|2018-05-02|2019-04-29|Device for producing expanded mineral granulated material|
    PCT/AT2019/050016| WO2019210338A1|2018-05-02|2019-04-29|Device for producing expanded mineral granulated material|
    US17/052,288| US20210396471A1|2018-05-02|2019-04-29|Device for producing expanded mineral granulated material|
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