RU2673469C1 - Charge into the glass melting furnace loading device - Google Patents

Abstract

FIELD: furnace technological processes.SUBSTANCE: technical solution relates to the charge into the glass melting furnace loading devices. Charge into the glass melting furnace loading device contains a support frame with a heat-shielding screen, the charge receiving hopper, which two outputs are connected to the two screw feeders inputs, angled to each other. Device also contains associated with the eccentric mechanism and charge pusher system of levers, consisting of the water-cooled console, to which one end a convex shaped pushing gate is attached. In the charge pushing process the gate moves along the elliptical path, and contains the central rectangular section attached perpendicular to the console so, that when the console moves forward, its lower edge is located parallel to the glass melt surface, and contacts the charge heaps, pushing them along the loading pocket center, and also contains connected to the gate central section the left and right side sections, located at an angle of 70–80° to the console movement direction. Left and right side sections lower edges have trapezoidal shape and are made with a bevel, directed upwards at an angle of 40–60° to the glass melt surface. They are not in contact with the charge heaps with the console initial angular position during its forward movement. Console other end is made with the possibility of rotation around its longitudinal axis, is connected to the reversible rotational drive. With the charge pushing into the loading pocket, the pushing gate moves along the elliptical path. Ability of the console and pushing gate rotation clockwise and counterclockwise at 40–60° allows to separately use the gate central and two side sections during the charge pushing. With the console turning for 20–30° clockwise or counterclockwise from the initial angular position, the gate turns and enters the intermediate position so, that with the console movement forward with the charge heaps, the gate central and one of the side sections adjacent parts begin to contact, performing the charge partial pushing forward and sideways.EFFECT: technical result is the charge multidirectional front optimization and expansion while maintaining the glass melting furnace loading pocket sealing.1 cl, 9 dwg

Description

The technical solution relates to devices for loading the charge and battle into glass melting furnaces and can be used in the production of flat glass, glass containers and other glass products.

The charge and battle are loaded into glass melting furnaces by automatic loading devices of various designs. When choosing the type of loader and the method of loading the charge, one has to take into account many factors affecting the nature of the melting of the charge, the cooking performance, the quality of the glass and the life of the furnace. Due to the continuity of the cooking process, it is advisable to load the mixture into glass melting furnaces continuously or in small portions in order to avoid sharp fluctuations in temperature and glass melt level. In addition, it is necessary to optimally distribute the mixture along the “mirror” of the molten glass in the loading pocket and maximize the surface area of the loaded mixture in order to effectively transfer heat to it from the gas-flame space of the furnace.

In this case, the design of the charge loaders should correspond to the design of the furnace loading pockets and limit the intake of cold air into the furnace, minimize the loss of thermal radiation, and also reduce the amount of dust and nitrogen oxides emissions into the surrounding space. All this can be achieved only with the use of loaders, providing not only the optimal distribution of the charge in the zone of its loading, but also allowing reliable sealing of the entire assembly of the charge in the glass melting furnace.

Known vibrational or pusher charge loader, which is most often used when feeding a mixture of charge and battle in regenerative glass melting furnaces with a horseshoe-shaped flame direction [1]. The raw material mixture from this loader is fed to the surface of the glass melt using a vibrating feeder, and the subsequent pushing of the charge heaps deep into the loading pocket is carried out using a water-cooled pusher, the gate of which moves along an elliptical path in front of the edge of the conveyor tray of the vibratory feeder. The additional angular movement of this feeder, carried out together with the pusher, allows you to feed the mixture in several directions and optimally distribute it over a larger surface of the glass melt inside the loading pocket, which is especially important for furnaces with high productivity. To protect the loader mechanisms from thermal radiation coming from a glass melting furnace, a protective shield is provided in the loading device.

But along with the indicated advantages, the pusher loader has one significant drawback, which is associated with the rotation of its carrier frame and mechanisms during the multidirectional (fan) filling of the charge into the loading pocket. In this regard, it is impossible to perform reliable sealing of the pocket.

Also known is the charge loader VIBROTUB (manufactured by ZIPPE, Germany), containing two tube vibratory feeders, each of which is equipped with an independent pusher of the raw material mixture [2]. The vibrating tube feeders in this loader are parallel to each other and do not change their angular position relative to the loading pocket during their operation, which allows the entire loader design to be fixedly mounted and to provide the necessary sealing of the glass melting furnace. Changing the performance of each of the vibrating feeders is carried out independently using frequency converters. It is also independently carried out and pushing individual piles of the charge into the pocket. Moreover, each pusher moves only in the horizontal plane when pushing the charge (for vibrating loaders of the fan type, the same movement of the pusher is carried out along an elliptical path). The reverse movement of the pusher with the gate is ensured by a linear servomechanism and a pneumatic drive of angular rotation of the pusher console, on which the gate is fixed. When the pusher console moves forward, it rotates along its longitudinal axis and the gate begins to contact the charge, pushing it through. And when the console moves back, it rotates to its original position, in which the gate rises and ceases to contact the loaded heaps of the charge, so as not to shift them back to the side of unloading from the vibrating feeder.

Such loading and similar pushing of the charge heaps with two pushers, which can work synchronously, in antiphase and asynchronously, allows the charge to be distributed in the loading pocket in only two directions (forward from the left side of the pocket and forward from the right side of the pocket). Considering that it is more expedient to distribute the charge over the mirror in three directions (fan), and in some cases, in one of three directions (center of the pocket, on the left and right sides of the pocket) it is necessary to pre-empt the charge, this loader has limited functionality to change the charge loading profile. This is due to the fact that the gates of both pushers are located perpendicular to the consoles of the pushers and when they move forward, the charge is also pushed forward only.

The closest technical solution to the claimed solution is a device for loading the charge into the EME-NEND glass melting furnace (a joint development of SORG and EME, Germany), comprising a fixed support frame, a receiving funnel, two screw feeders located at an angle to each other, a lever system associated with the eccentric mechanism and the pusher charge [3]. A water-cooled gate is attached to the pusher console located between the screw feeders, which pushes the charge along the “mirror” of the glass melt. In the process of pushing, the gate carries out reciprocating motion along an elliptical trajectory and when moving forward it lowers, in contact with the charge. And when you return to its original position, the gate rises and moves above the loaded heaps of the charge. Since the gate moves forward and back only in the vertical plane, and other loader mechanisms do not change their position relative to the loading pocket, it is easy to seal the charge filling unit in the furnace. This is also facilitated by the small size of the vertical slotted hole in the heat shield of the loader through which the charge pusher console passes.

Changing the preferred direction of feeding the charge into the loading pocket, carried out using this loader, is carried out due to the adjustable change in the number of loaded charge with screw feeders and its periodic pushing. But since the charge is pushed forward into the loading pocket by one slide, it is difficult to efficiently distribute the charge across the entire width of the loading pocket when using a rectangular slide mounted perpendicular to the pusher console. The rectangular shape of the gate in this design can be replaced by a convex (or arrow-shaped) shape, in which individual parts of the gate are attached at different angles to the pusher console. This makes it possible to further expand the loaded pile of the charge to the left and to the right when pushing them forward. But such a distribution of the charge, achieved by changing the shape of the gate, is fixed for a specific design of the gate and unregulated, which does not allow you to adjust the front load of the charge in the loading pocket using the control system using adaptive algorithms for feeding the raw material mixture into the glass melting furnace.

Thus, the known designs of the charge loaders either optimally distribute the charge on the surface of the molten glass in the loading pocket, the design of which remains leaky, or allow good sealing to be made, limiting the width of the differentiated loading front of the raw material mixture, and also limiting the possibility of automatic control of the loading profile.

The problem to be solved is the optimization and expansion of the multidirectional front of loading and pushing the charge while maintaining the sealing of the loading pocket of the glass melting furnace, as well as creating the possibility for automatic control of the charge loading profile.

The specified technical result is achieved by the fact that in the device for loading the charge into a glass melting furnace containing a support frame with a heat shield, a receiving funnel of the charge, two outputs of which are connected to the inputs of two screw feeders located at an angle to each other, a lever system associated with an eccentric a charge mechanism and pusher, consisting of a water-cooled console, to one end of which a convex pushing gate is attached, moving in the process of pushing the charge along an elliptical path and containing a central rectangular portion attached perpendicular to the console so that when the console moves forward, its lower edge is parallel to the surface of the glass and is in contact with the heaps of the charge, pushing them along the center of the loading pocket, and also containing left and right side sections connected to the central section gate and located at an angle of 70-80 ° to the direction of movement of the console, and the lower edges of the left and right side sections having a trapezoidal shape are made with chamfer, directed from their point of connection with the lower edge of the central portion of slide upwards at an angle 40-60 ° to the glass surface and not in contact with the piles of the charge in the initial angular position of the console, during its forward movement. In this case, the other end of the console, made with the possibility of its rotation around its longitudinal axis, is connected with a reversible drive of rotation so that when the console is rotated 40-60 ° clockwise from the initial angular position, the gate also rotates clockwise and its central portion is lifted from the surface of the loaded charge, ceasing to contact with it, and the right side portion of the trapezoidal shape is lowered and when the console moves forward it begins with its lower edge, the length of which is equal to the length of the lower edge and the central portion of the gate, push the pile of the charge forward and to the right, moving them from the center to the right side wall of the loading pocket. If the console rotates 40-60 ° counterclockwise from the initial angular position, the central portion of the gate also rotates counterclockwise and rises from the surface of the charge, ceasing to contact it when the console moves forward, and the left side portion of the trapezoidal shape drops and begins to the lower edge, the length of which is equal to the length of the lower edge of the central portion of the gate, push the pile of the charge forward and to the left, moving them from the center to the left side of the loading pocket. Moreover, when the console is rotated 20-30 ° clockwise from the initial angular position, the gate also rotates clockwise and stands in an intermediate position so that when the console moves forward, adjacent parts of the central and right side sections of the gate begin to contact, realizing partial pushing of the charge forward and to the right, and with a similar rotation of the console 20-30 ° counterclockwise from the initial angular position, the gate rotates counterclockwise and stands in another ezhutochnoe position where the console during forward movement with heaps of burden begin to contact the adjacent part of the central and left side portions of slide, carrying a partial charge pushing forward and to the left.

The difference between this technical solution and the prior art is the possibility of multidirectional rotation of the pusher console around its longitudinal axis with simultaneous reciprocating movement of the gate moving when the charge is pushed along an elliptical trajectory. Rotating the console in clockwise and counterclockwise directions allows you to rotate the gate in different directions and use different sections of the gate, oriented at different angles with respect to the pusher console. Moreover, the rotation of the gate and fixing it in at least three main and two intermediate positions can be carried out automatically in accordance with a predetermined charge loading algorithm, taking into account, for example, the distribution of the charge in the cooking zone and the direction of the flame in a regenerative glass melting furnace.

Another difference is the trapezoidal shape of the left and right side sections of the gate, located at an angle to the direction of movement of the console. Since the lower edges of these sections are made with a bevel directed from the place of their connection with the lower edge of the central portion of the gate upward at an angle of 40-60 ° to the surface of the glass melt, and do not come in contact with the heap piles at the initial angular position of the console during its forward movement, it becomes possible either exclude contact of the side sections of the gate with the charge, or provide this contact when changing the angle of rotation of the gate. All this together allows automatic adjustment of the charge distribution in the loading pocket to be carried out in the automatic control mode, ensuring uniform or preferential pushing of the charge in different directions.

The principle of operation of the device for loading the mixture into a glass furnace is illustrated by drawings, in FIG. 1 which shows a side view of the device; in FIG. 2 is a top view of the device; in FIG. 3 - pushing gate; in FIG. 4 - the initial position of the pushing gate; in FIG. 5-forward movement of the pusher (gate console in the initial angular position); in FIG. 6 - movement of the pusher forward (the gate console is rotated clockwise 40-60 ° from the initial angular position); in FIG. 7 - movement of the pusher forward (the gate console is rotated counterclockwise by 40-60 ° from the initial angular position); in FIG. 8 - forward movement of the pusher (the gate console is turned clockwise by 20-30 ° from the initial angular position); in FIG. 9 - forward movement of the pusher (the gate console is turned counterclockwise by 20-30 ° from the initial angular position). The initial angular position of the console is the position at which the lower edge of the central portion of the gate is parallel to the surface of the glass.

A device for loading a charge (Fig. 1, 2) into a glass melting furnace comprises: a support frame 1 with a heat shield 2; receiving funnel 3 of the charge, the two outputs of which are connected to the inputs of two screw feeders 4, 5, located at an angle to each other; leverage 6 associated with the eccentric mechanism 7; the pusher of the charge 8, consisting of a water-cooled console 9, to one end of which is attached a pushing gate 10 of a convex shape; the bearing assembly 11 of the rotation of the console; reversible rotation drive 12, connected to the console using a chain drive 13. The loading charge 14 is pushed in the loading pocket 15 of the glass melting furnace.

The push gate 10 (Fig. 3) contains: a central rectangular portion 16 attached perpendicular to the console 9 so that its lower edge is parallel to the surface of the glass melt; the left (relative to the direction of pushing the charge) lateral section 17 of a trapezoidal shape, located at an angle of 70-80 ° to the direction of movement of the console, with its lower edge pointing upward at an angle of 40-60 ° to the surface of the glass melt (at the initial angular position of the console); the right (relative to the direction of pushing the charge) section 18 is trapezoidal, also located at an angle of 70-80 ° to the direction of movement of the console, with its lower edge pointing upward at an angle of 40-60 ° to the surface of the glass melt (at the initial angular position of the console).

The angle of 70-80 ° of the location of the left and right side sections 17, 18 of the gate 10 with respect to the direction of movement of the console (this is the direction of loading of the charge) is selected so that the end edges of these sections when pushing the charge move perpendicular to the side walls of the loading pocket, which, in turn, adjacent to the side walls of the furnace at an angle of 70-80 °.

The raising of the lower edges of the left and right side sections 16, 17 upward at an angle of 40-60 ° to the surface of the glass melt (at the initial angular position of the console) is selected based on the height of the loaded pile of charge. If a small cumulus loading of the charge with heights of not more than 70 mm is carried out, then an angle of 40 ° is selected, and if the loaded heaps have a height of more than 70 mm, it is more expedient to make the angle of elevation of the lower edges of the side sections of the gate more abrupt so as not to shift the heaps of the mixture with these sections when pushing the charge in the central area.

The same length of the lower edges of the central and two lateral sections of the gate allows the formation of multidirectional flows of the charge in the loading pocket, having the same width.

The device operates as follows. Due to the fact that the frame 1 of the device for loading the charge into the glass melting furnace is stationary during operation, the heat shield 2 is adjacent to the loading pocket 15, providing reliable insulation of the furnace in this place from the intake of cold air, heat loss, and also from dust emissions and nitrogen oxides. The mixture from the intermediate hopper (not shown) enters the receiving funnel 3, the two outputs of which are connected to the inputs of the screw feeders 4, 5, located at an angle to each other. The performance of these feeders is regulated by separate frequency converters, which allows you to set variable material feed speeds for each mechanism and provides small heaps when loading. A mutual arrangement of feeders additionally creates the possibility of changing the direction of the predominant charge of the charge. However, without multidirectional pushing of the charge, changing the direction of supply of the raw material mixture in the loading pocket is inefficient. Therefore, in the design of this device, a pusher 8 of the charge 14 is used, consisting of a water-cooled console 9 and a gate 10 attached to it.

Direct contact with the charge in the process of pushing it is carried out using the gate 10, which, when the console moves forward, plunges its lower edges into the pile of the charge, pushing them, and returns to its original position above the feed material. The mode of such a reciprocating movement of the gate moving along an elliptical trajectory, as well as its stroke length, speed and immersion depth, are controlled by a lever system 6 and an eccentric mechanism 7 equipped with an appropriate electric drive (not shown).

The change in the direction of pushing the charge in the loading pocket is provided due to the special shape of the pushing gate and the possibility of additional rotation of the console around its longitudinal axis. The rotation of the console 9, which is attached to the system of levers 6 with the help of the bearing assembly 11, is carried out by a reversible rotary drive 12 connected to the console using a chain gear 13. This gear, when the reversible drive 12 is in operation, transmits rotation from the drive to the console, allowing it to rotate around its longitudinal axis (in Fig. 1, 2, this axis is indicated by a dash-dot line).

The predetermined angle of rotation of the console around its longitudinal axis with a controlled change in the position of the gate 10 and its individual sections 16, 17, 18 relative to the surface of the glass melt is controlled by a measuring system of rotation drive, for example, a follow-up electro-pneumatic drive manufactured by KAMOTSTSI can be used. Such a drive has significant torque and high precision positioning of the angular position of the drive shaft.

In the initial position, the gate 10 (Fig. 4) is raised above the surface of the charge and is close to the discharge holes of the screw feeders 4, 5. And its central section 16 is in the initial angular position, in which the lower edge of this section of the gate is parallel to the surface of the glass and does not contact with heaps of the charge 14. When the console 9 of the charge pusher moves forward (Fig. 5), the gate 10 moving along an elliptical path starts to lower and push the charge forward (deep into the loading pocket). Since the gate 10 is in the initial angular position, only the central portion 16 of the gate contacts the charge, pushing the heaps of the charge forward and in the center of the loading pocket. At the end of the gate’s forward stroke, it rises and returns above the charge to its initial position, after which the cycle of pushing the charge is repeated in the same way.

To push the heaps of the charge along the right (relative to the loading direction) side wall of the loading pocket 15, the gate 10 is rotated clockwise (if you look at the gate from the side of its fastening to the console 9) at an angle of 40-60 ° so that the right side section 18, the gate is lowered and, as the console moves forward, begins to contact the heaps of the charge, pushing them forward and to the right (Fig. 6) along the right side wall of the loading pocket. The central portion 16 and the left side portion 17 of the gate at this time are not in contact with the charge. In this case, the rotation of the gate is performed when it moves backwards, when it is raised above the charge.

To push the heaps of the charge along the left side wall of the loading pocket, the gates must be turned counterclockwise by an angle of 40-60 ° relative to the initial angular position. If, after pushing the heaps of the charge along the right side wall of the loading pocket, you must immediately switch to pushing the heaps of the charge along the left side wall of the loading pocket, then the gate must be rotated by 80-120 °. During this rotation, the left side section of the gate 17 is lowered (Fig. 7) and when the console moves forward, it begins to contact the heaps of the charge, pushing them forward and to the left along the left side wall of the loading pocket. The central portion 16 and the right side portion 18 of the gate at this time are not in contact with the charge.

By performing a similar rotation of the gate clockwise by 20-30 ° (Fig. 8), you can set the intermediate position of the central section 16 and the right section 18. In this intermediate position, when the console moves forward, approximately half of the central section and adjacent to it contact half of the right side section 18. The charge is partially pushed forward in the center of the loading pocket and forward and to the right along the right side of the loading pocket.

Similarly, a partial pushing of the charge in the center and on the left of the loading pocket is performed, which is performed when the gate rotates counterclockwise by 20-30 ° (Fig. 9).

Thus, the possibility of additional rotation of the gate during its movement along an elliptical trajectory creates the conditions for a wider (fan) distribution of the charge over the glass mass mirror in the loading pocket. This is facilitated not only by turning the gate clockwise and counterclockwise, but also by the trapezoidal shape of the side portions of the gate having a convex design. The location in the initial state of the lower edges of the side portions of the gate at an angle of 40-60 ° relative to the surface of the molten glass allows, if possible, turn the gate either to use these areas when pushing the charge, or not to use them. Moreover, turning the gate in one direction or another and changing the direction of pushing the charge along the front of its load can be carried out automatically in accordance with a given control algorithm.

Information sources

1. Efremenkov VV The technology of loading the mixture into glass melting furnaces // Technology of glass. Reference materials. / Ed. P.D. Sarkisova. Moscow. 2012.S. 391-404;

М. Innovation in batch charging // Glass Worldwide (Russian language supplement). 2015. May/June. P. 55.2.

M. Innovation in batch charging // Glass Worldwide (Russian language supplement). 2015. May / June. P. 55.

3. Pat. RF for the invention 2547865, IPC С03В 3/00. Method and device for loading glass melting furnaces / V. Erich; publ. 04/10/2015 // Bull. 2015. No.10.

Claims (1)

A device for loading a charge into a glass melting furnace containing a support frame with a heat shield, a receiving hopper of the charge, two outputs of which are connected to the inputs of two screw feeders located at an angle to each other, a lever system associated with an eccentric mechanism and a plunger of the charge, consisting of a water-cooled a console, to one end of which a convex push-up gate is attached, moving in the process of pushing the mixture along an elliptical path and containing a central rectangular section, perpendicular to the console so that when the console moves forward, its lower edge is parallel to the surface of the glass melt and in contact with the heaps of the charge, pushing them along the center of the loading pocket, and also containing left and right side sections connected to the central section of the gate and located at an angle 70-80 ° to the direction of movement of the console, characterized in that the lower edges of the left and right lateral sections having a trapezoidal shape are made with a bevel directed from the junction I have them with the lower edge of the central portion of the gate upwards at an angle of 40-60 ° to the surface of the glass melt, and do not come in contact with the pile of the charge at the initial angular position of the console while it is moving forward, while the other end of the console, made with the possibility of its rotation around its longitudinal axis, connected to the reversing rotation drive so that when the console is rotated 40-60 ° clockwise from the initial angular position, the gate also rotates clockwise and its central portion rises from the surface of the load ichts, ceasing to contact with it, and the right side section of the trapezoidal shape drops and when the console moves forward, begins with its lower edge, the length of which is equal to the length of the lower edge of the central section of the gate, push the pile of the charge forward and to the right, moving them from the center to the right side wall of the loading pocket, if the console rotates 40-60 ° counterclockwise from the initial angular position, the central portion of the gate also rotates counterclockwise and rises from the surface of the charge , ceasing to contact with it when the console moves forward, and the left side section of the trapezoidal shape drops and begins with its lower edge, the length of which is equal to the length of the lower edge of the central section of the gate, push the pile of the charge forward and to the left, moving them from the center to the left side of the loading pocket moreover, when the console is rotated 20-30 ° clockwise from the initial angular position, the gate also rotates clockwise and stands in an intermediate position so that when the console moves forward ed with the heap of the charge begin to contact the adjacent parts of the central and right side sections of the gate, partially pushing the charge forward and to the right, and with a similar rotation of the console 20-30 ° counterclockwise from the initial angular position, the gate turns counterclockwise and stands in another intermediate the position at which, while the console is moving forward, adjacent sections of the central and left lateral portions of the gate begin to contact the heap piles, partially pushing the mixture forward and to the left.

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