EP2743332B1 - Device and method for regulating and controlling individual gas pressure of a coke oven chamber - Google Patents

Description

The invention relates to an apparatus and a method for controlling or controlling the individual gas pressure of individual ovens of a coke oven battery according to the preamble of the main claim. A device of the type mentioned is known from EP 0 649 455 known. The document discloses several embodiments, of which that of Figure 10 is commented.

In this embodiment, a vertical portion of the riser elbow protrudes from above into the template. At the lower end of this section, a water seal is provided which provides a seal to the dip tube, which is vertically arranged vertically below the riser elbow. Within the riser manifold trickle water is supplied, which is to cool the gas and is ultimately collected in the master sump. Above the water labyrinth seal, there are water nozzles to keep the water level high within the water labyrinth seal and effect the said seal.

The water labyrinth seal is open at the top, which can accumulate dirt, which can hinder the flow of water and worsen the rinsing effect of the water labyrinth seal.

The dip tube protrudes at the lower end at least partially into the template sump.

By raising and lowering the dip tube, the gas pressure should be regulated.

The immersion of the dip tube in the template is unfavorable, since in the template usually unevenly condensates and solids deposit and therefore it can come to different levels of water. Upon contact with the condensates, the dip tube becomes dirty. By uneven deposits in the template and the lifting movement of the device waves can be created on the water surface, which negatively affect the pressure control.

The water level in the template can only be determined theoretically, the actual water level is unknown and would have to be measured additionally. The extension of the riser elbow and the immersion tube underneath cause an undesirable height and an additional load, which is unacceptable in existing coke oven batteries.

The adjusting device for the dip tube can be arranged laterally, above or below, in this case, the template wall is penetrated, a separate seal is necessary.

The document also discloses differently designed lower end edges of the dip tube, which influence the gas outlet.

Finally, the citation also shows various embodiments of diving cups, which for example have drainage openings in the area of the bottom. These drain holes are unfavorable, since they tend to clog through the impurities present in the water. To restore the function, these immersion cups must be periodically cleaned, z. B. by rinsing, tilting the cup or tilting and the use of a cleaning mandrel.

The generic WO 94/01513 A1 discloses a method for controlling the gas pressure of a coke oven chamber, wherein a vertically movable pipe is arranged on a riser extension, which is sealed via a dive with respect to the riser elbow extension. The edge of this tube dives into a master sump, whereby a chamber pressure control is effected by different dipping of the tube.

From the DE 366 274 C is a safety diving device for templates in gas generators known, which connects to a riser via an elbow a dip tube, which is surrounded by another dip tube with some distance that extends with its lower edge below the liquid level of Absperrflüssigkeit. The latter dip tube can be raised and lowered within certain limits to adjust the dipping depending on the gasification time and the gasification process.

The invention has for its object to provide a pressure control device and a method to allow easy and reliable control or control of the gas pressure.

This is achieved with the features of the characterizing part of the main claim according to the invention. The control of the gas pressure via the different immersion of the dip tube in the immersion cup. This requires a low-noise control because the immersion cup is always filled to overflow with water and thus there is a constant water level.

In the invention, the sleeve disposed within the riser pipe serves two purposes. On the one hand, it is provided outside the riser elbow with the actuator for height-adjustable arrangement of the dip tube, on the other hand, it serves to feed the water seal or the water labyrinth seal that is present between the dip tube and the riser manifold. This allows a good seal between the riser and the dip tube over the entire height of the vertical position change.

Both the water supply to the sleeve, as well as the actuator are arranged outside of the riser pipe and are therefore not subject to the hot gases and the flammable, toxic, aggressive and polluting components contained therein. These include in particular the constituents of hydrogen, carbon monoxide, methane and hydrocarbons, as well as tar, benzene and naphthalene. Contamination is prevented by this arrangement, increases the reliability.

During operation of the device, the coke oven gas flows down through the riser pipe in the direction of the template. Since the lower edge of the slidable dip tube dips into the water in the dip cup, the coke oven gas must flow through this water to get into the template. Depending on the immersion depth of the immersion tube in the immersion cup, the path length of the gas changes through the water.

If the dip tube is immersed deeper, the path through the water is longer, so the coke oven gas must overcome a greater water pressure to flow through the immersion cup. There is a back pressure in the manifold and in the furnace until the pressure is sufficient to break the water barrier.

The possibly existing slots in the dip tube represent a direct connection from the interior of the dip tube to the template, so that the gas can flow without the detour through the water in the template. As the dip tube continues to submerge, the free slot area above the water surface is reduced. This also creates a back pressure, which causes an increase in pressure in the furnace and in the manifold.

In practice, a part of the coke oven gas flows through the free slot cross-sectional area and a part through the water, in the case of a small gas flow only through the water.

The adjustment of the dip tube is so large that it can be completely pulled out of the dip cup. This results in addition to the possibly existing slot area, an annular gap between the lower edge of the dip tube and the water surface through which the coke oven gas can flow through.

The immersion tube is immersed more or less deep in the immersion cup during normal operation until the back pressure corresponds to the desired furnace pressure. Deep immersion causes an increase in pressure in the furnace, less deep immersion causes a pressure drop.

When hanging the oven, the coke should be forced out of the oven, opening the oven doors. As a result of these large openings, so much air (oxygen!) Would be sucked into the furnace and into the receiver and thus into the gas cleaning system, so that an ignitable mixture can form. To prevent this, the connection between the oven and the template must be closed.

To achieve this, the dip tube is immersed in the immersion cup so far that neither the back pressure from the oven, nor the suction from the template sufficient to break the water trap in the dip cup. Previously, a riser lid is opened, so that the coke oven gas still flowing out, ignites and burns.

After the oven has been pressed, that is empty, it has to be filled with coal for the next cooking process (attaching the oven). This is usually done by arranged in the furnace ceiling filling holes or by inserting a coal cake through the oven door. Upon contact of the coal with the hot furnace walls, large quantities of a so-called filling gas are produced and dust is still being whirled up.

This filling gas and the dust must be extracted so that they do not get into the environment (emission protection). In order to allow the unhindered transition into the template, the pressure regulating device is opened as far as possible. For this, the dipping cup is swung away. The water flows out of the cup and the weggeschwenkte cup thus releases the full cross section of the dip tube.

The riser pipe usually has a substantially vertical section in the region of the template. This allows a calm inflow of the gas for presentation. In addition, the vertical portion of the riser elbow allows easy passage of the sleeve through the manifold. In the penetration point, a simple water seal can be provided, the overflow again reaches the interior of the riser and finally the template is supplied.

Furthermore, it is advantageous if a positioning device for the immersion cup is mounted within the sleeve. This positioning is thereby shielded from the hot gases and is not subject to the already mentioned danger of contamination by the gas, or contained suspended matter. The drive for the positioning can also be arranged outside of the riser, which in turn the reliability increases and does not make it necessary in contrast to the prior art to guide the operating device through the template wall.

It is also advantageous to form the positioning device as a tube and to provide at the upper end with a water supply. The water is used to cool the linkage and to feed the water of the immersion cup, which is preferably located below the dip tube. Especially in the vicinity of the water labyrinth seal of the dip tube, an outlet opening for the water can be provided, from which the water flows on the inside of the sleeve down and is usually collected in the dip cup.

After the dip tube usually protrudes into the dip cup, the water level within the dip cup remains constant at the level of the overflow edge. The water supply takes place primarily by at least one sprinkler nozzle, which is located for example within the riser elbow. In addition, however, water is added via the water seal of the sleeve. This water also serves to maintain the constant water level within the immersion cup.

Due to the permanent inflow of water, the immersion cup is always filled to the brim. As a result, a constant and defined water level is achieved, which allows in contrast to the prior art, a precise and rapid control of the gas pressure.

Due to the constant overflow of water over the edge of the immersion cup, soiling is permanently rinsed out. While in the prior art, the immersion cup has some narrow drainage holes that can clog and clog the water in the invention over the entire edge of the immersion cup over, so that blockages are not to be feared.

The gas outlet takes place with horizontal completion of the dip tube evenly over the entire circumference. However, it is possible to slit the dip tube at its lower end, or to provide it with other regular or irregular termination elements to achieve a smooth gas outlet.

In order to pivot the immersion cup, it is advantageous to fix them on one side over at least one bearing point and to pivot about this bearing point with the help of the positioning. For this purpose, it is advantageous if the positioning device is pivotally connected at its lower end with the immersion cup. A chain or a rope are possible as a connection.

Another embodiment of the invention may consist in that the device for regulating or controlling the individual gas pressure of individual ovens of a coke oven battery is not assigned to the template, but to the riser manifold. It has a sleeve which is connected at the bottom via at least one line to the water seal and above has a water supply for feeding the water labyrinth seal outside the riser elbow. The vertical portion of the riser, or its extension may be adapted to the diameter of the device, for example, be wider than the riser itself.

By arranging the device within the riser, or the extension just mentioned, it is possible to make the control and the control of the gas pressure regardless of the shape of the template. This provides the advantage that the control according to the invention can also be used with small templates, in which the device would otherwise not find enough space.

The invention is also realized by a method, which is characterized in that a dip cup located below the dip tube is constantly filled with water, so that the water overflows over an overflow edge and forms a constant water level, with respect to the lower end of the dip tube for controlling and controlling the gas pressure is set.

Figur 1

einen Vertikalschnitt durch eine erste Ausführungsform einer erfindungsgemäßen Vorrichtung mit angehobenem Tauchrohr;

Figur 2

einen Teilvertikalschnitt durch die Vorrichtung von Figur 1 mit abgesenktem Tauchrohr und Angabe der Wasserführung innerhalb einer Hülse;

Figur 3

einen Teilvertikalschnitt durch die Vorrichtung von Figur 1 mit Angabe der Wasserführung innerhalb einer Positioniereinrichtung;

Figur 4

einen Teilvertikalschnitt durch den oberen Teil der Vorrichtung von Figur 1 mit Darstellung einer Wasserdichtung;

Figur 5

einen Teilvertikalschnitt durch den unteren Teil der Vorrichtung von Figur 1 mit einer nach unten geschwenkten Tauchtasse, und

Figur 6

einen Teilvertikalschnitt durch eine weitere Ausführungsform der erfindungsgemäßen Vorrichtung, bei welcher die Druckregelvorrichtung nicht innerhalb der Vorlage angeordnet ist, sondern innerhalb des Steigrohrkrümmers.

The invention will be described below with reference to a drawing. It shows

FIG. 1

a vertical section through a first embodiment of a device according to the invention with raised dip tube;

FIG. 2

a partial vertical section through the device of FIG. 1 with lowered immersion tube and indication of the water flow within a sleeve;

FIG. 3

a partial vertical section through the device of FIG. 1 indicating the water flow within a positioning device;

FIG. 4

a partial vertical section through the upper part of the device of FIG. 1 with representation of a water seal;

FIG. 5

a partial vertical section through the lower part of the device of FIG. 1 with a dipping cup tilted down, and

FIG. 6

a partial vertical section through a further embodiment of the device according to the invention, in which the pressure control device is not disposed within the template, but within the riser elbow.

The FIG. 1 shows the vertical section through a pressure control device 15 according to the invention with a coke oven 1, which is guided during operation of coke oven gas 2 within a riser pipe 3 vertically upwards. The riser has at the top of an inspection and cleaning flap, below which an obliquely downwardly directed Steigrohrkrümmer 4 connects. Within the manifold, at least one sprinkler nozzle 5 is arranged, through which water can be introduced into the manifold for cooling the coke oven gas. The riser pipe 4 opens with its vertical section 6 in the template 7, which has a horizontal end plate 8 above.

At the lower end of the riser pipe a water labyrinth seal 9 is arranged, which comprises a coaxial with the riser pipe extending ring 10 which is connected at the top by a horizontal leg 11 with the vertical portion 6. The manifold 4, or the vertical portion 6 forms together with the ring 10 a downwardly open circular space into which a dip tube 12 projects, which surrounds the lower portion of the riser pipe coaxially. To complete the water labyrinth seal, the dip tube 12 has a ring 13, which in turn is arranged coaxially to the dip tube and is secured at its lower end via a horizontal leg 14 on the dip tube. The ring 13 forms together with the dip tube 12 an upwardly open circular space which is filled for the operation of the device 15 shown with water to achieve a water immersion, which allows the dip tube to move vertically during operation of the device and at the same time To ensure sealing.

Within the vertical portion 6 of the riser pipe 4, a double-walled sleeve 16 is arranged, which is flow-connected at least via a connecting channel 17 with the circular labyrinth space between the dip tube 12 and the ring 13. The double-walled sleeve 16 thus ends at the bottom in the area of the water labyrinth seal 9. Its upper end is located outside and above the vertical section 6 of the riser elbow and is sealed against the riser pipe by means of a water seal 18. Outside the riser, the sleeve 16 is connected to an actuator 19, by means of which the sleeve 16 and the dip tube 12 are displaceable in the vertical direction. In the region of the upper end, the sleeve 16 still has a water supply 20, which serves the interior of the double-walled sleeve but also via the connecting channels 17, the water labyrinth seal 9 with water fill and reach the previously mentioned height-adjustable gas seal the dip tube opposite the riser manifold.

As the water is fed into the water labyrinth seal from below and flows upwards, solids are prevented from penetrating into the water labyrinth seal from above. In addition, the constant flow of water also cleans the interior of the seal, impurities are flushed out.

Within the template 7 and below the dip tube 12 is a dip cup 21, which can be pivoted on one side via a bearing assembly 22. The bearing assembly 22 is located at the lower end of a suspension 23, e.g. is attached within the template to the end plate 8.

The immersion cup 21 is wider than the dip tube 12 and may be formed as an upwardly open truncated cone. It has lateral walls 24, e.g. are arranged at an angle of 70 ° obliquely to the horizontally extending bottom 25. The immersion cup serves to receive water which, for example, passes through the nozzle 5, the water supply 20 and the water supply 29. The immersion cup is therefore always filled to the brim with water during operation. Since water is constantly flowing, the water flows over the edge into the original, as indicated by the arrow 26. The sloping walls prevent turbulence in the gas outlet.

Due to the permanent overflow of the water over the overflow edge of the immersion cup, any floatable contaminants that may be contained in it are constantly flushed out. In the prior art, these contaminants remained within the cup, whereupon there is a need to periodically tilt and empty the cup.

To the dipping cup 21 in the in FIG. 1 To keep shown horizontal position, but also to tilt the same for emptying, serves a positioning device 27 which is disposed within the double-walled sleeve 16 and projects beyond the same. Outside the sleeve, it is connected to an actuator 28. The positioning device 27 is formed as a hollow tube and has at its upper end via a water supply 29, is guided by the water down.

By at least one water outlet opening 30, the water from the positioning and off in the interior of the sleeve 16 occur. The water then flows down into the dipping cup 21.

The positioning device 27 is pivotally provided at its lower end with a connector 31 which is also hinged to the bottom 25 of the dip cup. The connector can also be designed as a rope or chain.

The positioning device 27 is opposite the double-walled sleeve 16 by a e.g. sealed at the upper end of the sleeve stuffing seal 32 sealed. The actual sealing is done by the water. The stuffing gasket prevents the water from escaping from the top of the sleeve when a higher water pressure is set. It allows flexible sealing of the movable rod.

The device 15 shown serves to regulate or control the gas pressure of the coke oven 1. From such an oven, gases 2 exit at temperatures of approximately 800 ° Celsius. The escaping from the coke gas is cooled within the riser manifold 4 to about 80 ° Celsius. For cooling, the introduced water, but brings components of the gas, especially the tar for condensing. This results in deposits that are to be minimized in the inventive device in its harmful effect. In particular, the functionality of the controls of the device below should not be affected.

In the apparatus according to the invention, the coke oven gas 2 is guided via the riser pipe 4 down into the vertical section 6 thereof. Through the sprinkler nozzle 5, the gas is wetted and cooled, it then passes vertically downwards and is introduced into the immersion tube 21 within the dip tube 12. The dip tube ends within the water area of the immersion cup and below the water level.

In order to achieve a gentle gas discharge from the dip tube, it is conceivable to make the lower edge of the dip tube uneven, e.g. Use of slots, saw teeth, shaft elements etc.

The gas emerging from the dip tube passes through the water of the dip cup and over the edge of the dip tube in the template and is then removed. By a different immersion height of the dip tube the desired pressure control takes place.

The FIG. 2 shows the projecting into the dip cup 21 lower end of the dip tube 12, which is located below the water level of the immersion cup 21.

This figure also shows the introduction of the water via the water supply 20 into the double-walled sleeve 16 and the forwarding of the water from the bottom closed sleeve over the Connecting channel 17 in the water labyrinth seal 9. At the upper end of the dip tube 12, or the ring 13 over the double-walled sleeve 16 introduced water overflows and enters the immersion cup 21, as indicated by the arrow 33. As a result, solids are flushed out of the water labyrinth seal.

Within the riser elbow 6, the pressure p1, which is greater than the pressure p2 present in the original, prevails.

The FIG. 3 shows the introduction of water via the water supply 29 in the interior of the positioning device 27. The water exits through the opening 30 from the tube of the positioning device 27 and enters the interior of the double-walled sleeve 16. The water flows at the lower end of the sleeve 16 in turn the dipping cup 21.

The FIG. 4 shows the function of the water seal 18. Water enters in the direction of arrow 35 through the water supply 34 into the interior of the housing and closes the sleeve 16 by means of the water sliding against the riser manifold 4, from. Advantageously, the arrangement of the sleeve and the housing outside of the manifold, as this low temperatures and a lower height can be achieved.

The FIG. 5 shows the emptying of the dipping cup 21. When tilting the immersion cup by means of the actuator 28, not only the water is released, but also all the suspended matter and impurities contained therein.

The FIG. 6 shows a variant of the invention, in which the pressure control device is not arranged in the template 7, but in the riser pipe 4, which may be extended and expanded for this purpose, for example. The same parts are provided with the same reference numbers.

While in the embodiment described above, the control device protrudes into the template, it now ends within the riser, or its extension 38 of the vertical portion 6. The extension is wider than the vertical portion 6 and is located between the riser 4 and the template. 7 and rejuvenates z. The extension 38 has at its upper end via a closure plate 39, by means of which it is attached to the vertical portion 6. At her the suspension 23 of the dipping cup 21 is arranged. At the bottom it has a rejuvenation 37, which also creates the connection to the template 7.

The extension 38 is designed so wide that it can accommodate the pressure control device. However, the basic structure of this embodiment corresponds to that of the previous one described. Only the arrangement within the riser manifold makes the difference.

The advantage of this variant is that existing coke ovens can be retrofitted more easily because the template does not need to be changed. In particular, if the size is too small, it is advisable to leave the same unchanged and e.g. to provide the riser elbow with an extended extension, within which then finds the control device place.

In the invention, the water labyrinth seal can also be supplemented or replaced by a simple water seal or other seal.

Claims (12)

1. Device for regulating or controlling the individual gas pressure of individual ovens (1) of a coke oven battery, in which a rising-pipe bend (4) has its lower end associated with an immersion pipe via a water seal (9), said immersion pipe (12) being supported such that it is vertically adjustable by means of an actuator (19)
   characterized in that
   the immersion pipe (12) is, for causing a change in pressure, immersible to different depths into an immersion cup (21) located preferably below the immersion pipe (21),
   the rising-pipe bend (4) has arranged therein a sleeve (16) which serves to position the immersion pipe (12) and the lower end of which is connected via at least one conduit (17) to the water seal (9), and that a water supply (20) for feeding the water labyrinth seal (9), and the actuator (19) are provided at the top, outside the rising-pipe bend.
2. The device according to claim 1,
   characterized in that
   the water seal (9) is a water labyrinth seal..
3. The device according to claim 1 or 2,
   characterized in that
   the rising-pipe bend (4) projects from above into a collecting main (7).
4. The device according to any one of the preceding claims,
   characterized in that
   the immersion cup (21) has an overflow edge (36) and is filled up to said edge when the device is in operation.
5. The device according to at least one of the preceding claims,
   characterized in that
   the sleeve (16) has arranged therein a positioning means (27) of the immersion cup (21).
6. The device according to claim 5,
   characterized in that
   the positioning means (27) is provided with an actuator (28) at the upper end thereof.
7. The device according to claim 5 or 6,
   characterized in that
   the positioning means (27) is implemented as a tube and has at the upper end thereof a water supply (29).
8. The device according to one of the claims 5 to 7,
   characterized in that
   the positioning means (27) has at least one water discharge opening (30).
9. The device according to any one of the preceding claims 5 to 8,
   characterized in that
   the lower end of the positioning means (27) is articulated on the immersion cup (21) by means of a connection piece (31).
10. The device according to any one of the claims 5 to 9,
    characterized in that
    the positioning means (27) is sealed off from the sleeve (16) in a vertically variable manner.
11. The device according to one of the preceding claims,
    characterized in that
    the sleeve (16) is sealed off from the rising-pipe bend (4) in a vertically variable manner.
12. A method of regulating or controlling the individual gas pressure of individual ovens (1) of a coke oven battery, according to which the lower end of a rising-pipe bend (4) has sealingly arranged thereon an immersion pipe (12) which, for regulating or controlling the gas pressure, is changed in position such that the lower end of the immersion pipe (12) is immersed in water,
    characterized in that
    an immersion cup (21) located below the immersion pipe (12) is continuously filled with water so that the water flows over an overflow edge (36) and establishes a constant water level with respect to which the lower end of the immersion pipe (12) is adjusted so as to regulate or control the gas pressure.

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