SK140794A3 - Method of manufacture of melt and melting furnace for realization of this method - Google Patents

Abstract

In the process for the preparation of a melt for the production of mineral fibres, the raw material (6) to be melted is introduced in the form of a pile of loose material so that it forms an inclined pile surface (7). In order to form a melt zone, at least part of the pile surface (7) is subjected to the melting temperature in at least one combustion chamber (8). The melt flowing out in the region of the pile surface (7), forming a melt surface crust (7a), is collected in a collection chamber (11) on the base of the combustion chamber (8) and transported out to the outside for further processing. In order to provide a process by means of which the melt output can be significantly increased, it is proposed that the melt surface crust (7a) of the pile surface (7) is broken up in at least one region from the inside outward. <IMAGE>

Description

A process for producing a melt and a melting furnace for carrying out this process i!

FIELD OF THE INVENTION The present invention relates to a process for producing a melt for the production of fibers, wherein the raw material to be used for the production of fibers

I ^'1 scoops, so created is supplied as

The invention has non-fusion melts, an inclined surface area of the melting temperature surface, wherein at least a portion of this inclined surface is exposed to form a molten zone.

combustion chamber; and. the melt in the region of the surface formation of the bulk material flowing downstream of the surface crust on the melt is collected downwardly in the collection chamber at the bottom of the combustion chamber and is discharged;

out for further processing. The invention further relates to a melting furnace for carrying out this method.

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The prior art,

The method as well as the melting furnace for carrying out the above-described method are already known

MO 92/04286.

This is in addition to the solution and the waste material to be recycled and recycled to be recovered. Here, the metering takes place directly into the combustion chamber, in which there is a strong vortex of the gases, so that there is a risk that at least a part of the material reaches the walls and the vault of the combustion chamber.

SUMMARY OF THE INVENTION It is an object of the invention to provide such a method to increase melting performance.

therefore, it is to improve the known methods by which it is possible substantially

It is also an object of the invention to provide a suitable device for carrying out this method.

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SUMMARY OF THE INVENTION

This object is achieved by a method of producing a mineral fiber melt, wherein the raw material to be melted is fed as a bulk material so as to form an inclined surface, and at least a portion of the inclined surface is exposed to the melting temperature of the combustion space to form the molten zone. the melt in the region of the surface flow of the bulk material flowing down to form a surface crust on the melt is collected in the collection space at the bottom of the combustion chamber and discharged out for further processing according to the invention. it breaks from the inside in at least one part.

In this way, the advantage is that better and faster melting of the raw material to be melted is possible in the region of the surface crust of the melt, whereby the break-out or destruction of the surface crust is caused not only in a narrow narrow region but also in the wider surroundings. Thus, the process of melt draining.

melting considerably accelerates

Generally, it is sufficient to break out or break up the surface crust of the melt that is formed on the surface of the bulk material in only one, for example, the central region of the surface of the bulk material, to induce intense movement everywhere in the bulk material, especially its surface. In large melting furnaces with a correspondingly high raw material content, it is advantageous for the surface melt to be broken out in several adjacent and / or superimposed regions.

According to a particularly preferred embodiment of the process according to the invention, recycled material or waste material is fed to the inside of the surface melt surface.

In this way, a substantial advantage arises in that the waste or recyclable material is added to the melting zone j such that it cannot be trapped by the gas flow in the interior of the combustion chamber. Team i

there is a further advantageous side effect that a cushion or waste bed is formed on the inside of the melt or the broken surface of the melt.

Even the recyclable material, after which the raw material can easily slide and better reach the melting zone.

The melting furnace, based on the solution of WO 92/04286, with a feed device for the raw material to be melted, with a raw material storage space, so that the raw material forms an inclined surface ¹ , with at least one side combustion chamber equipped at least one burner such that a melting zone with a surface crust of the melt forms on the surface of the bulk material;

and with a collection space and a melt outlet flowing down in the region of the surface area of the bulk material according to the invention, which is based on the fact that

I ¹ ', provided at least one fixed hollow body, open at the ends, which opens at a distance from the inside of the surface crust of the melt, and that the hollow body is arranged a movable sliding element and by its end projecting from the hollow body extends to the surface melt bark.

Preferred embodiments of the solutions according to the invention are set forth in the subclaims.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be further elucidated with reference to the accompanying drawings, in which: FIG

FIG. 1 shows a vertical section through a melting furnace;

Fig. 2 shows a vertical section according to FIG. 1, but in another embodiment, and FIG. 3 cross-section m.

according to yet others

EXAMPLES I, and _t

In FIG. 1 shows a vertical section, for the sake of simplicity, by way of example of an embodiment of a melting furnace with an upper wall 2 or a vault, a side wall 3 and a bottom 4. It is evident that other, preferably vertical boundary walls are arranged parallel to the plane of the drawing. as in the left part of FIG. Here, too, boundary walls can be provided which enclose the interior space of the melting furnace 6 outwardly. Particularly when the amount of raw material is large enough and the combustion gases are completely removed by the raw material upwards, the walls in the left part of FIG. 1, as shown, deleted.

In the upper wall 2, a simplified representation i is shown

a metering device 5 by which the raw material 6 to be melted is metered into the melting furnace 6. The raw material 6 consists of conventional components such as rock, coke and additives. When there is sufficient space within the melting furnace 6 and when the feed of the raw material is carried out at only one location, for example by a cylindrical shaft of the dosing device 5, the raw material 6 forms a cone, more precisely truncated cone. the angle is dependent on the raw material being added 6. When dosing is performed at several adjacent locations perpendicular to the plane of the image or by a rectangular shaft perpendicular to the plane of the image, a more or less flat surface of the bulk material is formed perpendicular to the plane Figure. Next to the surface 7 of the bulk material 6 there is a combustion chamber 8 which is equipped with at least one, in the example shown, two burners

The arrangement and orientation of the burners 9, 10 are circumstances. Usually, gas or oil or other suitable burners 9, 10 are used so that a melting zone is formed on the surface 7 of the bulk raw material 6 which extends over the largest part of the surface 7. The rock melts and flows down into the collection area. from where it is discharged for further processing to produce mineral fibers.

'and iO. dependent on

A dashed line appears in the melting zone area

Even a certain type of surface melt 7a, the surface melt 7a extending to a certain depth ^{1 of the} surface area 7. In order to achieve better and faster slipping of the lump raw material 6, i.e. the rock I to melt, while promoting the melt flow down, is a modified device as described below.

The device is provided with a solid elongated hollow body 12 open at both ends, which according to FIG. The hollow body 1 terminates, as shown, at a distance from the inside of the surface crust 7a of the melt and at a distance from the surface 7. At its left end which extends from the 6, the hollow body 12 is mounted on a service platform, not shown in more detail, which is simply indicated by the fixed bearings 14, 15. In the hollow body 52, a movable sliding element is provided which protrudes from the hollow body 1 2 extends into the surface melt 7a, whereby the surface melt 7a breaks out or breaks up by forward and backward movement of the sliding element and repeated impacts. There is also a side effect, namely that the flue gases present in the combustion chamber 8 can more easily penetrate into the raw material so that, as is usual, they are discharged through the metering device 5 and the discharge pipe (not shown) connected thereto.

Preferably, the hollow body 12 is in the form of a tube having a closed casing in the area of the raw material 6. Next is.

As shown, the hollow sliding element body 2 is provided in the conveying area above the receptacle in which the raw material 6, formed as an upper-opened trough, is provided with respect to the feed device in the construction of the recycling plant.

13. The snake channel 13 is arranged to feed waste material 23. As a result, it is possible for the waste and / or recycling material to be conveyed by the conveyor screw 6 to the surface melt surface 7a where it is mixed with the other raw material 6.

An advantageous construction is achieved in that the conveyor screw 16 consists of a shaft 7 and a welded helical surface 18, which extends from the trough 13 to the surface crust 7a of the melt. The shaft 7 protrudes with its outer end, in FIG. 1 is connected to the drive 20, preferably by an electric motor, so that the shaft 7 and the helical surface 8 are rotatable about their axis. Their rotation speed is preferably controllable. The helical surface 48 preferably has an external diameter of about 275 mm. The conveyor screw 16 is shaped to fit the hollow body 12, that is, it has a shape such that when it is filled with material, no flue gas can exit the hollow body 12. Depending on the degree of filling of the conveyor screw 16, the waste or recyclable material t can be supplied

in an amount of 20 to 30 m ³ per hour. The hollow body 12 terminates inside the surface crust with a surface area of 7,600 mm, preferably about 500 mm, of the body f2 loaded and melted from the heat melt, respectively before distances of about 300 to 600 mm.

7a vo

In this way, the hollow is not exposed to any impermissibly high heat since the shaft 17 and the screws and the face 18 with their leading ends into the surface crust 7a and therefore are thermally loaded, are made of a durable material. Nevertheless, the transport screw 16 may occur.

For this reason, the conveyor screw 16 is preferably designed in the region of the accessible chute 13 so that an extension piece can always be inserted at this point.

The drive 20 of the shaft 17 and the conveyor 16 is supported by a bracket on the linear guide 21, i.e. the entire unit! . thus, the drive 20, the shaft 17 and the conveyor screw 16 can be moved in a reciprocating motion in the axial direction according to the arrow 22.

The stroke of this reciprocating movement is preferably adjustable continuously. It is about 300 mm in diameter. Also, the stroke frequency is preferably controllable and adaptable to the conditions.

I I,

The return stroke is preferably operable by means of a hydraulic device (not shown). By rotary movement and simultaneous stroke movement of the conveyor screw 16, it is achieved that, firstly, the waste or recycled material is transported to the rear wall of the melt surface crust 7a, and secondly the melt surface crust 7a, as already explained, breaks or breaks , so that the rock to be melted is better slipped. The feed device 23 for supplying waste and recycling material is ο

preferably provided with a dosing device (not shown).

As shown in FIG. 1, the hollow body 12 and the conveyor screw 16 are arranged substantially horizontally, although preferably about the middle of the surface area 7 of the bulk material 6.

In particular in large melting furnaces 7, several hollow bodies 12 can be arranged next to each other and / or one above the other, which are then preferably operated in alternation. For this purpose, either the conveyor worms 16 are alternately displaced or put into operation as explained above, it being understood that the hollow bodies 12 which are not in operation must be closed at the outer end, or another the possibility is that in each hollow body 12 one conveyor screw 16 is left and the drive 20 is always moved to the actuated conveyor screw 16, and is connected to the respective shaft 17, for example by means of quick couplers. When the raw material 6 has formed a cone, it is also possible to arrange a plurality of hollow bodies 12 radially with respect to the surface 7. For example, the drive would then be rotatable by means of a suitable pivot ring and attached to the respective shafts 17 with conveying worms 16.

In FIG. 2 shows another embodiment which is substantially identical to that of FIG. 1, so that the same reference numerals have been used for all identical or equally acting components. In this case, however, the raw material 6 is bounded from three sides, that is, the rear wall 24 and the two walls extending parallel to the axis of FIG. 2, so that, depending on the combustion chamber 8, the surface area of the bulk raw material 6 is only formed on one side.

In FIG. 3 shows yet another exemplary embodiment in which they were for the same or as in FIG. 1, the same embodiment has a hollow body 12 and a position, although preferably perpendicular to the surface 7, respectively. At 25, the volume of the raw material 6 in the like-acting components of the reference numeral. In this conveyor screw, the inclined surface melt surface 7a has decreased due to the inclined rear wall of the melting furnace.

It is common to all exemplary embodiments that, with the screws 16, the stones fall again into the front threads, they are then rotated together with the conveying or part of the raw material 6 of the conveying screw 16 by pushing them forward into the melting zone. additional break-out or break-up of the surface crust 7a of the melt occurs.

further movement of the raw material 6, in the area of the raw material 6 by the projections and described

In this regard, the hollow body 12 may be provided with external ribs or other fixed bearings 14 and 15 so as to allow a stroke movement, for example by means of a similarly performed stroke hollow body 12, so that hydraulic devices or movements, shocks or vibrational movements

The hydraulic body 12, the interfaces of the surface struts may be advantageous, the devices which are connected to the hollow to be formed as described above for the stroke movement of the conveyor screw 16 of the surface crust 7a of the melt by the inner end 19 of the conveyor screw 16. by the stroke movement of the hollow body 12, that is to say the end of the hollow body 12, facing and of the melt, during their strokes also up to this surface crust 7a of the melt. Then, when said end of the hollow body 12 is made of a heat-resistant material, preferably a cemented carbide. In order to cause movement in the raw material 6, the hollow body 12 is provided with external ribs or protrusions in the area of the raw material 6.

An alternative embodiment of the melting furnace illustrated in FIG. 1, the raw material dosing device 5 is such that the raw material 6 between two 7 arranged in the same way as in FIG. 1 is formed by the fact that 6 is formed by vertical walls spaced apart from each other to form the roof ridge of the melting furnace and parallel to the two inclined surfaces 7 of the bulk material 6. In practice, the right portion of the melting furnace 1 of FIG. 1, a mirror space symmetrically to the left around a vertical median plane is formed, so that a combustion space 8 is formed on both sides of the surfaces 7 thus formed. The hollow bodies 12 and the sliding elements, which are the conveyor screws 16 of the shaft 17. the helical surfaces 18 and the inner ends 19 are then offset and arranged such that only their inner end comes close to the melt surface crust 7a and, as already mentioned, one combustion surface space 8 is arranged on each side of the inclined surface.

area 7 is

The arrangement of the hollow bodies 12 and the conveyor screws 16 can then be realized in practice as shown in FIG. 3, i.e. obliquely from the bottom through the bottom of the melting furnace 1. Depending on the spatial conditions, the arrangement of the hollow bodies 12 and the conveyor screws 16 can also be made vertically from the bottom through the bottom of the melting furnace 7. It will be appreciated that in this two-sided or symmetrical arrangement of the two combustion spaces 8, the central wall corresponding to the rear wall 24 of FIG. 2, or an inclined wall corresponding to the inclined rear wall 25 of FIG. 3. In another embodiment of the comb or cone of the bulk raw material 6, several circumferential points of the bulk raw combustion chamber 8 may also be provided at suitable and always lateral to the surfaces 7 of the material 6.

Claims (24)

PATENT CLAIMS Method for producing a mineral fiber melt, wherein the raw material (6) to be melted is fed as a bulk material so as to form an inclined surface (7), and wherein at least a portion of said inclined surface (7) is exposing the molten zone to the melting temperature of the combustion chamber (S), and the melt in the region of the bulk surface flow (7) flowing down, forming a surface melt (7a), collects in the collection chamber (11) at the bottom of the combustion chamber (3); is conveyed out for further processing, characterized in that the surface melt surface (7a) of the surface area (7) of the bulk material breaks out from the inside in at least one area i. Method according to claim 1, characterized in that the surface peeling is carried out in a plurality of juxtaposed and / or areas i. the melt (7a.) being superimposed 3. The method according to claim 1, characterized in that material is fed to the melt. according to claim 1 or 2, characterized by the inner side of the surface bark (7a) of recyclable material or waste material respectively Melting furnace according to one of claims 1 to 3, with carrying out the method according to one metering device (5) of the raw material (6) to be melted, with a raw material storage space (6) so that the raw material (6) forms an inclined surface. estor means an area (7), (8), which at least one burner (9, with at least 10), so that a melting zone is formed on the surface (7) of the bulk material, with the surface crust (7a) of the melt, and a collecting space (11) and a melt outlet flowing downwards in the area of the surface (7) of the bulk material. the raw material area (6). At least one fixed hollow body (12) is provided, open at the ends which spaced from the inside of the surface melt surface (7a) and that a movable sliding element (16, 17) is provided in the hollow body (12). 18, an ISO which, with its end (19) projecting from the hollow body (12), extends into the surface crust (7a) of the melt. The melting furnace according to claim 4, characterized in that the hollow body (12) is formed as a pipe having a jacket in the region of the raw material (6) and that the sliding element is formed by a conveyor screw (16). Melting furnace according to claim 5, characterized in that the tube (12) is formed as an open channel (13) in the region of the outside of the raw material storage space (6) and that a feed device (13) is arranged above the channel (13). 23) for the supply of waste and / or recycling material. Melting furnace according to claim 5 or 6, characterized by a shaft (17) and which decomposes the melt. that the conveyor screw (16) consists of a welded helical surface (18), from the trough (13) to the surface crust (7a) of claim 7, characterized by its outer end projecting from the drive (20), in particular The melting furnace according to claim 1, characterized in that the shaft (17) of the tube (12) is with an electric motor, so that the shaft (17) and the screw face (18) are rotatable about their axis. Melting furnace according to claim 8, characterized in that the mountain range (20) is supported on a linear guide (21) so that the drive unit (20), the shaft (17) and the screw (16, 18) is reciprocating in the axial direction. direction. 10. The melting furnace of claim 1, wherein the furnace is changeable. the stroke (22) of the reversing movement is continuous Melting furnace according to claim 10, characterized in that the stroke (22) is approximately 300 mm in diameter. Melting furnace according to one of Claims 9 to 11, characterized in that. that can be operated by hydraulic equipment. reciprocating movement ill Melting furnace according to one of Claims 5 to 12, characterized in that the conveyor screw (16) is shaped to fit the pipe (12) and the power is sized such that approximately 20 to 30 m ³ is fed depending on the filling level. hour of waste or recycling material. Melting furnace according to one of Claims 7 to 13, characterized in that the external diameter is about 275 mm. the helical surface (18) has Melting furnace according to one of Claims 5 to 14, characterized in that the tube (12) terminates inside the melt surface (7a) of about 300 to 600 mm, preferably about 500 mm. Melting furnace according to one of Claims 7 to 15, characterized in that the shaft (17) and the helical surface (18) are made of a heat-resistant material. I '(4 ^Å LGL · 17th melting furnace značuj úCa a part formed in the inner end (19) below I'a at characterized ob1ast and is 1oz one of claims 6 to 16, you and the screw conveyor (16) is a trough (13 ), so that the wear extension piece can also be worn. The melting screw (16) is a furnace according to any one of claims 5 to 15, characterized in that the tube (12) is arranged substantially horizontally. 17, transport costs 19. The melting screw (16) to the surface crust of the furnace is (7a) according to one and in that the desired melts are arranged. A pipe (12) and a conveying incline, preferably perpendicular The melting markers arranged next to the bulk material furnace according to one of the claims 1 to 4, wherein the pipes and the cone face each other and / or above radial to the surface claims 5 to 19. 21. The melting furnace is characterized in that the tube is arranged at approximately the bulk material (7). according to claim 18, in (12) and conveying means in the middle of the height y of the screw, the surface screw (16) being the surfaces Melting furnace according to one of Claims 5 to 21, characterized in that the tube (12) is displaceably arranged in the longitudinal direction and is operable by a stroke-out device. The melting furnace according to claim 22, characterized in that the end of the tube (12) at the surface melt crust (7a) is formed of a heat-resistant material, in particular of cemented carbide. A melting furnace according to claim 22 or 23, characterized in that the tube (12) is provided with external ribs or projections in the region of the raw material (6). Melting furnace according to one of Claims 4 to 24, characterized in that the raw material dosing device (5) is designed in such a way that the raw material (6) is arranged between two vertical and spaced apart walls of the melting furnace (1). ) forms a roof ridge with two sloping surfaces, and that the hollow body (12) and the sliding elements (16, 17, 1S, 19) are offset and arranged so that only their inner ends lie in the surface crust (7a) of the melt and that a combustion chamber (8) is provided on the side of each inclined surface. Melting furnace according to one of Claims 4 to 24, characterized in that a plurality of combustion chambers are arranged to the side of the surfaces of the bulk material.