HK1144955B - Telescopic chute for charging coke ovens - Google Patents

Description

Telescopic charging cartridge for charging coke ovens

Technical Field

The invention relates to a telescopic charging chute for charging coke ovens, comprising a vertically oriented feed hopper and a lower telescopic chute part which is suspended by means of a plurality of pivoting elements on a vertically adjustable lifting device.

Background

Telescopic charging barrels having the described features are known, for example, from DE 19964274B 4.

In the operation of modern coking plants, the coal used is charged into the oven chambers of the coke ovens by means of charging cartridges on coal-charging trucks. The telescopic charging chute is formed in multiple parts and has sealing means in the boundary region and in the immersion region, which sealing means are intended to prevent the discharge of emissions during the charging process.

Telescopic charging barrels are also known which have a compensator made of steel or fabric (EP 1293552 a). The compensator enables an inclined position of the telescopic tube parts so that the telescopic tube axis matches the position of the charging opening of the oven cavity and also ensures the tightness of the charging telescopic tube.

In the operation of the telescopic charging chute, if the axis of the feed hopper and the axis of the charging opening into the furnace chamber are not aligned, an inclined position of the parts which are movable relative to one another results. The compensator is subjected to considerable loads here, in particular carbon deposits and high temperatures have to be taken into account. By pressing in the inclined position, considerable forces can act on the movable parts of the telescopic charging chute, which in extreme cases can cause deformation of their connecting regions. It must also be taken into account that the sealing ring and the sealing cone are rapidly distorted due to the high temperatures and that the alignment of the parts that can move relative to one another changes continuously during operation due to the distortion. In the case of a multi-part compensator-less telescopic charging shaft, seals are provided between the movable parts thereof, the oblique position of the parts also having an adverse effect on the sealing action. The life of the telescopic charging barrel is unsatisfactory. The telescopic charging barrel must be replaced and repaired after a short operating time.

Disclosure of Invention

Against this background, the object of the present invention is to provide a telescopic charging chute with which axis deviations between the axis of the charging hopper and the axis of the charging opening into the oven chamber of the coke oven can be compensated without the movable parts of the telescopic charging chute being subjected to excessive loads as a result.

According to the invention, this object is achieved by a telescopic charging chute as described below. According to the invention, the telescopic charging chute comprises a vertically oriented feed hopper and a lower telescopic section which is suspended by means of a plurality of first pivoting elements on a vertically adjustable lifting device, wherein a tubular insert is arranged between the feed hopper and the lower telescopic section, which insert is suspended movably on a plurality of second pivoting elements and surrounds the outlet cross section of the feed hopper with a free space allowing lateral compensating movements, the insert having an annular flange which is sealed on an annular surface of the feed hopper, the annular flange of the insert and the associated annular surface of the feed hopper extending substantially horizontally and the lower telescopic section surrounding the housing of the tubular insert; the device is characterized in that a first sealing element is arranged between the flange of the insert and the associated annular surface of the feed funnel, the lower part of the telescopic shaft is sealed against the tubular housing of the insert by means of a second sealing element, the first and second sealing elements are embodied as hoses or membranes, and the interior of the hose or the space enclosed by the membranes is connected to a pressure source. As the swinging member, a swinging lever, a chain, a rope, or the like can be used. The insert has an annular flange which is sealed on the annular surface of the feed hopper. Furthermore, the telescopic lower part surrounds the housing of the tubular insert.

When the telescopic lower part is lowered into a charging opening of the coke oven, which is not aligned with the axis of the charging hopper, the telescopic lower part is moved in the X-direction and the Y-direction according to the axis deviation while matching the actual position of the charging opening, but does not occupy an inclined position. This is ensured by the oscillating suspension of the telescopic lower part on the associated lifting device. The lower part of the telescopic cylinder is kept vertical and at right angles to the cover of the coke oven. At the same time, the telescopic lower part moves the likewise pivotably suspended insert, which is freely movable horizontally, in the X-direction and in the Y-direction. The insert is likewise held vertically and at right angles to the furnace lid during this lateral movement. The construction of the telescopic charging chute according to the invention makes it possible to avoid the inclined position of the telescopic chute components. During the lowering into the charging hole frame and during the adaptation to the actual position of the charging opening in the furnace cover, no internal contact pressure can occur between the components of the telescopic charging shaft, since all the components of the telescopic charging shaft, while maintaining the vertical orientation, are moved laterally by the pivoting suspension of both the lower telescopic shaft component and the insert. Furthermore, the insert constructed according to the invention allows a sufficiently large adjustment movement of the lower part of the telescopic shaft in the vertical direction. Unlike compensators, the vertical adjustment travel is not limited by structural constraints.

The telescopic lower part and the insert are each suspended on at least three pivoting elements, preferably pivoting levers. Preferably four or more swinging arms. The second pivot elements for suspending the insert are expediently connected to the upper end of the insert, preferably to the outer circumference of the flange. The annular flange of the insert and the associated annular surface of the feed hopper preferably extend substantially horizontally.

A first seal, which is preferably designed as a hose or a membrane, is expediently arranged between the flange of the insert and the associated annular surface of the feed funnel. The interior of the sealed hose or the space enclosed by the membrane is connected to a pressure source. During the working movement of the telescopic charging chute, the sealing element is relieved, so that the annular flange is freely movable without any pressure against the associated annular surface of the charging hopper. After the telescopic charging chute has been lowered onto the charging opening in the furnace lid and has reached its end position, the sealing element is activated, i.e. it is charged with compressed air or another pressure medium. By applying pressure, the sealing element bulges outward and presses against the associated surfaces of the feed funnel and the insert, thereby ensuring an optimum seal during the filling process.

Preferably, the telescopic lower part is also sealed with respect to the tubular housing of the insert by means of a second seal, wherein the second seal can likewise be embodied as a hose or a membrane, which can be pressurized by a pressure source. The seal is relieved during the downward or upward movement of the lower part of the telescopic shaft. For the filling process, the seal is acted upon with compressed air or a pressure medium and reliably seals the gap between the lower part of the telescopic shaft and the outside of the insert.

The first and second seals are configured to be heat resistant and to be easily removably mounted. According to a preferred embodiment of the invention, the first and second seals are arranged in chambers, the chamber walls of which can be designed such that the seals are protected against excessive temperatures and excessive dust loads. The temperature load of the sealing element arranged between the lower telescopic tube part and the insert can also be reduced in that the housing of the insert enclosed by the lower telescopic tube part is provided with a heat-insulating structure at least over a length corresponding to the vertical adjustment travel of the lower telescopic tube part. The housing of the insert is preferably designed as a thermally insulating double-walled component having a cylindrical outer shell and an inner shell which tapers conically towards the upper end.

The telescopic lower part has, in a manner known per se, a cylindrical section and a discharge cone connected on the underside. According to the invention, a sealing element is arranged at the free end of the discharge cone for sealing against the charging-hole frame of the coke oven. A sealing device is also provided at the upper end of the cylindrical section for abutting against the housing of the insert.

Drawings

The invention is explained below with the aid of the drawing, which shows only one exemplary embodiment. Fig. 1 to 3 each show a longitudinal section through a telescopic charging chute according to the invention in different operating positions.

Detailed Description

The telescopic charging shaft shown in the figures is attached to a discharge device 1 on the underside of a not shown coal charging car and serves to transfer the used coal from the discharge device 1 into the furnace chamber of the coke oven without emission. The telescopic charging chute comprises, in its basic structure, a feed hopper 2 connected to the discharge device 1, a telescopic lower part 3 and a tubular insert 4 arranged between the feed hopper 2 and the telescopic lower part 3. The telescopic lower part 3 is suspended by means of a plurality of pivoting elements 5, preferably pivoting levers, on a vertically adjustable lifting device 6 and can be lowered by means of an adjusting movement of the lifting device 6 onto a charging-hole frame 7 in the cover of the coke oven. A charging hole frame 7 forms an opening in the furnace lid.

The tubular insert 4 of the telescopic charging chute is likewise suspended movably on a plurality of pivoting elements 5', for example pivoting levers, and surrounds the outlet cross section 8 of the feed hopper 2 with a free space allowing lateral compensating movements. The insert 4 has an annular flange 9 which is sealed against an annular surface 10 of the feed hopper. The annular flange 9 and the associated annular surface 10 of the feed hopper extend substantially horizontally. The respective pivoting element 5' for the suspension insert 4 is attached to the upper end of the insert, in this embodiment to the outer periphery of the flange 9. The pivotally suspended telescopic lower part 3 encloses the housing of the tubular insert 4 and is likewise sealed with respect to this housing.

The mode of operation of the telescopic charging barrel becomes apparent from a comparative observation of fig. 1 to 3. Fig. 1 shows the telescopic charging chute in a raised rest position. To load the oven cavity, the telescopic cylinder lower part 3 is lowered to the position shown in fig. 2. In the operating state shown in fig. 2, the filling opening in the furnace cover is aligned with the axis 11 of the feed hopper 2, while fig. 3 shows the operating state when a lateral deviation a in the X-direction and/or the Y-direction exists between the axis 11 of the feed hopper and the filling opening. As is apparent from a comparative observation of fig. 2 and 3, all movable parts 3, 4 of the telescopic charging chute are also oriented vertically when there is a lateral deviation a in the X-direction and/or Y-direction between the axis 11 of the charging hopper and the axis of the charging port. When the telescopic lower part 3 is lowered into the charging hole frame 7, the telescopic lower part 3 moves according to the deviation a in the X-direction and/or the Y-direction while matching the actual position of the charging hole frame 7, without occupying an inclined position. This is reliably prevented by the active suspension on the respective pivoting element 5. The telescopic lower part 3 is held vertically and at right angles to the furnace lid. At the same time, the telescopic lower part 3 moves the likewise pivotably suspended and horizontally freely movable insert 4 laterally in the X or Y direction. The insert 4, due to its pendulum suspension, remains also vertical during this lateral movement and at right angles to the furnace lid. The arrangement according to the invention reliably avoids an inclined position of the telescopic tube members 3, 4 and prevents jamming in the charging telescopic tube during lowering into the charging-port frame and during lateral adaptation to the actual position of the charging-port frame 7.

A plurality of seals 12 are arranged between the movable parts 3, 4 of the telescopic charging shaft. A first seal 12 is located between the flange 9 of the insert and the associated annular face 10 of the feed hopper. Furthermore, the telescopic lower part 3 is sealed with respect to the tubular housing of the insert 4 by means of a seal 12'. The seals 12, 12' are designed as hoses or membranes, the interior of the hose or the space enclosed by the membrane being connected to a pressure source, not shown. The seals 12, 12' are activated by the loading pressure of compressed air or other pressure medium and bulge outward, where they eliminate the gap between the surfaces to be sealed. This state is shown in fig. 2 and 3. If the telescopic charging chute is to be moved in or out, the seals 12, 12' are deactivated, i.e. depressurized. This state is shown in fig. 1. Fig. 1 shows that the sealing elements 12, 12' do not abut against the respective surfaces to be sealed, so that the telescopic tube parts 3, 4 can move completely freely relative to one another when they perform their working movement, so that it is neither possible to generate internal tensile and compressive forces nor is the sealing elements subject to wear as a result of the movement of the individual parts.

The seals 12, 12' are arranged in cavities which not only ensure an orderly positioning of the individual seals, but also protect the individual seals from excessive dust loads or high temperatures.

The housing of the insert part 4 is designed as a thermally insulating double-walled component with a cylindrical outer housing 13 and an inner housing 14 which tapers conically towards the upper end. Due to the thermal insulation of the double-walled component, the temperature load on the seal 12' of the telescopic lower part 3 is greatly reduced.

The telescopic lower part 3 has a cylindrical section and a discharge cone connected on the underside. A sealing element 15 is arranged at the free end of the discharge cone for sealing against the frame of the charging hole. On the upper end of the cylindrical section, a sealing device is present, which comprises the described seal 12, for abutting against the housing of the insert 4.

The telescopic charging chute according to the invention is distinguished by high operational reliability due to its design and can compensate for large positional deviations between the axis 11 of the charging hopper 2 and the charging opening in the cover of the coke oven. In the device according to the invention, maintenance and cleaning work can be limited to a minimum.

Claims (6)

1. A telescopic charging chute for charging coke ovens comprises a vertically oriented feed hopper (2) and a lower section (3) of the chute, the telescopic lower part is suspended on an adjustable lifting device (6) by means of a plurality of first pivoting elements (5), wherein a tubular plug-in (4) is arranged between the feeding hopper (2) and the telescopic cylinder lower part (3), the insert (4) is movably suspended on a plurality of second pivoting elements (5') and surrounds the outlet cross section (8) of the feed hopper (2) with a free space allowing lateral compensating movements, the insert (4) having an annular flange (9), the flange is sealed on an annular surface (10) of the feed hopper (2), the annular flange (9) of the insert (4) and the associated annular surface (10) of the feed hopper (2) extend substantially horizontally and the telescopic lower part (3) surrounds the housing of the tubular insert (4); characterized in that a first sealing element (12) is arranged between the flange (9) of the insert and the associated annular surface (10) of the feed funnel, the telescoping cylinder lower part (3) is sealed against the tubular housing of the insert (4) by means of a second sealing element (12 '), the first and second sealing elements (12, 12') are designed as hoses or membranes, and the interior of the hoses or the space enclosed by the membranes is connected to a pressure source.

2. Telescopic charging shaft according to claim 1, characterised in that second oscillating elements (5') for suspending the insert (4) are attached to the upper end of the insert.

3. Telescopic charging shaft according to claim 1, characterised in that said first and second sealing means (12, 12') are arranged in the cavity.

4. Telescopic charging shaft according to claim 1, wherein the housing of the insert (4) enclosed by the lower telescopic part (3) is cylindrical and provided with a heat-insulating structure at least over a length corresponding to the vertical adjustment travel of the lower telescopic part (3).

5. Telescopic charging shaft according to claim 4, characterised in that the housing of the insert (4) is designed as a thermally insulating double-walled component with a cylindrical outer shell (13) and an inner shell (14) which widens conically towards the upper end.

6. Charging telescope according to claim 1, characterized in that the telescope lower part (3) has a cylindrical section and a discharge cone connected on the underside, wherein a sealing element (15) is provided at the free end of the discharge cone for sealing against the charging hole frame of the coke oven, and a sealing device is provided at the upper end of the cylindrical section for abutting against the housing of the insert (4).