WO2014191079A1

WO2014191079A1 - Method and device for reducing leaks on inlets and outlets of a wet quenching tower

Info

Publication number: WO2014191079A1
Application number: PCT/EP2014/001267
Authority: WO
Inventors: Thorsten CONRAD; Klaus Freimuth; Bodo Freimuth
Original assignee: Thyssenkrupp Industrial Solutions Ag
Priority date: 2013-05-27
Filing date: 2014-05-12
Publication date: 2014-12-04
Also published as: TW201506146A; DE102013105408A1

Abstract

The invention relates to a method for reducing leaks on inlets and outlets (8, 9) of a wet quenching tower during the quenching of hot coke. In front of the inlets and outlets (8, 9) an air flow is produced which is substantially parallel to the inlet/outlet (8, 9). The invention also relates to a wet quenching tower designed for carrying out said method.

Description

Method and device for reducing leaks at entrances and exits of a wet extinguishing tower

Description:

The invention relates to a method for reducing leaks at entrances and exits of a wet extinguishing tower in the deletion of hot coke and a set up for carrying out the method wet extinguishing tower. Such extinguishing towers are used for the wet quenching of hot coke. The coke discharged from the coke ovens is dropped into a fire truck. The fire truck goes from the coke oven battery in the extinguishing tower, where the hot coke is sprayed with water. As a result, the coke is cooled suddenly and thus avoid burning of the hot coke. This creates very large amounts of steam. These are also called extinguishing swaths. The sudden evaporation of extinguishing water also generates large quantities of dust and tears them upwards with the extinguishing swaths. Therefore, internals for the separation of particles from the quenching swaths are installed in the vent of the wet quench tower.

In DE 1 212 037 a seal of the quenching chamber is described against the ingress of outside air. To seal the fire truck is provided on its front sides with rectangular plates or boxes that fill in the extinguishing position, the entrance / exit of the wet extinguishing tower. Due to the temperature difference between the hot quenching and the cooler ambient air buoyancy in the quench tower is generated. The known seal prevents or reduces a subsequent flow of outside air into the quenching tower. This is intended to reduce the proportion of gas in the swaths, in order to improve the condensation of the water vapor content in the extinguishing swaths.

The emission protection installations in the extinguishing tower lead to a pressure loss in the vent of the extinguishing tower. This reduces the buoyancy. Therefore occurs in wet extinguishing towers repeatedly the problem that swaths escape during the deletion at the entrances of the extinguishing tower. Unfavorable wind conditions can also cause deletion from the driveways

CONFIRMATION COPY be pushed out. The extinguishing clouds leaving the entrances / exits are uncleaned and mixed with dirt particles. Persons and buildings are affected by the swaths leaving the entrances / exits.

To keep leaks at entrances and exits of a wet extinguishing tower as low as possible, usually the free cross section of the entrances and exits is adapted to the profile of the fire truck used. However, this may be limited by the fact that for the passage of the Löschwagens to the other side of the extinguishing tower a larger profile is to be kept clear because z. B. the extinguishing locomotive has a greater clearance profile in height or in width than the fire truck. Another reason may be the leadership of the tracks for the fire truck in the area of entry / exit, for example in a curve. The object of the invention is to reduce leaks at entrances and exits of a wet extinguishing tower. In doing so, the production should be influenced as little as possible. In particular, time-consuming operations should be avoided. The solution should also be implemented reliably and with the lowest possible investment costs. Finally, the lowest possible operating costs incurred when using the measures.

This object is achieved in that before entering and exiting a wet extinguishing tower for entry / exit substantially parallel air flow is generated. For this purpose, the wet extinguishing tower comprises means for generating an air flow in front of the entrance / exit, wherein the air flow to the entrance / exit is directed substantially parallel. The air flow prevents extinguishing swaths emerge at the entrance / exit and / or catches escaping extinguishing swaths directly at the entrance or exit of the wet extinguishing tower. In contrast to the prior art, the inflow of air into the quenching tower is not prevented, but escaping extinguishing swaths are intercepted. This can significantly reduce pollution, especially in the area around the coke quench tower. According to an advantageous embodiment of the method according to the invention, an air curtain is generated in front of the entrances and exits of the wet extinguishing tower. In this case, air is sucked in from the environment and blown out horizontally or vertically, producing an air curtain covering the entry / exit in height and width. The wet extinguishing tower has at least one air curtain generating device. This comprises at least one arranged on the side of the entrance / exit or above the entrance / exit device which sucks in air from the environment and blows out to produce the air curtain covering the entrance / exit in height and width. The air curtain separates differently conditioned air masses inside and outside the wet extinguishing tower by a barrier of flowing air, thus preventing their replacement. The barrier consists of a directed air flow, which circulates in the manner of an air roller between the discharge opening and the intake opening of the device. The device for generating the air curtain may have a fan and adjustable blades for aligning the exiting air flow. Alternatively, the unit may also be equipped with venturi nozzles that are operated with a propellant and suck air from the environment by the action of the propellant. Preferably, the air curtain generating device is arranged above the entry / exit opening. Thereby, an air roller with a vertical direction is generated. Additionally or alternatively, an air curtain generating device can be arranged on the left and / or right of the entry / exit. This creates a horizontally directed veil. Also, a combined Luftbeschleierung of vertical and one or two-sided horizontal veils can be used.

The inventive use of an air curtain generating device can effectively prevent the escape of extinguishing swaths through the entry and exit openings. In addition, the fire truck can move freely in and out, without the need for time-consuming closing operations for sealing the extinguishing chamber. As an alternative or in addition to an air curtain, a suction can be generated before the entrances / exits. The device for generating an air flow in this case comprises a suction device which is effective over the width of the entrance / exit and sucks out escaping vapor, spray and / or dust. Preferably, the suction device is arranged above the entry / exit opening.

The suction device preferably comprises at least one suction hood, which expediently extends above the entrance / exit over the entire width of the entry / exit opening. The extracted airflow can be adjusted by means of adjustable blinds, flaps and / or sliders to the local needs. By means of at least one fan or blower, the emerging extinguishing swaths are sucked off. Preferably, pipes and / or channels are connected to the suction hood, which lead the sucked steam swaths into the vent of the quenching tower. The Einblasstelle is chosen so that there is no disturbance of arranged in Löschturmschlot deposition. The injection into the extinguishing tower sluice preferably takes place in such a way that the upward flow of the extinguishing swaths in the extinguishing tower is assisted. The injection openings in the extinguishing tower are therefore positioned and aligned so that a flow in the buoyancy direction is enhanced. In a particularly favorable embodiment of the invention, the injection openings are nozzle-shaped, thereby producing an upward flow.

The flow velocity in the hood or pipes / channels is chosen so that entrained dust particles can not settle. The extracted and blown into the extinguishing tower steam swirls are cleaned via the arranged in Löschturmschlot deposition.

In a further variant of the invention, the opening of the entrances and exits during the deletion process is reduced by a closing movement of a one-piece or multi-part gate element. This combination of the generation of an air flow before the entrances / exits and a reduction of the free cross section of the entrances / exits during the deletion process proves to be particularly favorable and leads to an effective reduction of leaks. In addition, the operating costs are reduced, since the required air flow does not have to be as strong as in a fully open entrance / exit.

The free cross section of the entrance and exit can be covered by flexible elements that protrude into the entrance / exit. For example, flexible temperature-resistant louvers that hang from above into the entrance / exit are suitable. Also hangings and / or bristles that protrude into the entrance / exit, can reduce the free cross-section.

The use of adjustable blinds proves to be advantageous. These blinds are withdrawn before and during the entry of the Löschwagens so far that the necessary clearance gauge is available. If the fire truck is positioned in the extinguishing tower, the blinds are moved as close as possible to the boundary profile of the extinguishing agent. The entrances / exits can also be completely closed by the blinds.

According to a variant of the invention, the wet extinguishing tower on a device with vertically and / or horizontally adjustable, one-piece or multi-member closure elements. The closure element may be a plate. After entering the Löschwagens in the extinguishing tower, the plate is moved while the entry / exit completely or partially closed by the plate. In case of a partial closing, the entry / exit is narrowed down so much that a discharge of extinguishing swaths is reduced. In the open state, the plate is moved so far that the necessary clearance profile is released for the entry and exit of the Löschwagens.

Preferably, the free cross-section of the entrance / exit during the deletion process is covered by a device having multi-element closure elements. The individual limbs are movably connected. In this case, a sectional door can be used to cover the free cross section of the extension / retraction. This consists of interconnected plates, which are also referred to as sections. The individual sections can be moved vertically to open or close. Alternatively or additionally, the sectional door of one or two sides can reduce the profile of the entrance / exit during the deletion process. Even with a partial reduction of the entrance / exit opening effectively escape of extinguishing swaths is reduced.

In a variant of the invention, the free cross section of the entrance / exit during the deletion process is covered by a roller shutter. The device comprises a so-called tank, which consists of articulated profiles. The tank is usually guided in laterally arranged rails and wound on startup on a shaft. The roller shutter can also consist of several, movably connected slats. The roller door is preferably arranged above the entrance / exit opening and thereby moves in the vertical direction. Alternatively or in addition to this, the roller shutter can narrow the profile of the entry / exit from one or two sides or completely close it.

In the following the invention will be explained with reference to a drawing showing only one embodiment. 1 shows a wet extinguishing tower with air curtain generating devices at entrances and exits of the wet extinguishing tower,

Fig. 2 is a wet extinguishing tower with suction on and

Exits of the wet extinguishing tower,

3a and 3b an entrance / exit opening of the wet extinguishing tower with a horizontally adjustable closure element for reducing the free cross section of the entrance / exit opening in a side sectional view and in a front view,

4a and 4b an inlet / outlet opening of the wet extinguishing tower with a vertically movable closure element for reducing the free cross section of the entrance / exit opening as a side sectional view and as a front view,

Fig. 5a and 5b an entrance / exit opening of the wet extinguishing tower with a

Roller shutter in a side sectional view and as a front view,

6a and 6b an entrance / exit opening with a sectional door as a front view and as a sectional view from above.

Fig. 1 shows a wet quench tower for the deletion of hot coke. A fire truck 1 is retracted into a quenching chamber 2. With a extinguishing spray 3, the coke in the fire truck 1 is sprayed with water. This creates extinguishing clouds that contain water vapor and dust particles. Above the quenching chamber 1, a vent 4 is placed, in which the extinguishing swaths rise upwards.

In the vent 4, a spraying device 5 is provided, with which the rising extinguishing swaths are additionally sprayed with extinguishing water. This spraying device 5 serves to further cool the extinguishing swaths and thus to achieve increased condensation. In the vent 4 emission control 6 are arranged. The emission control devices 6 include a plurality of fins 7. The wet extinguishing tower has an entrance 8 and an exit 9 for the fire truck 1 on. According to the invention, the extinguishing tower comprises an arrangement for intercepting the extinguishing swaths flowing into the inlet / outlet 8, 9. In the exemplary embodiment according to FIG. 1, the arrangement comprises air curtain generation devices 10. The air curtain generation devices 10 are arranged above the entrance 8 and the exit 9. They create a vertical downward flow of air. The air curtain generating device 10 draws air from the environment and blows it at a high speed parallel to the entrance 8 and the exit 9. The air curtain produced in this way prevents the escape of extinguishing swaths.

FIG. 2 shows a variant of the invention in which the arrangement for catching extinguishing swaths comprises suction devices 11. The suction devices 11 are arranged above the entrance 8 and the exit 9. The suction devices 11 comprise a hood, to which pipes or channels are connected, which lead the extracted extinguishing swaths into the vent 4 of the extinguishing tower. The pipes are connected below the emission protection 6 to the vent 4 of the extinguishing tower. The injection openings are designed so that the buoyancy flow in the vent 4 is amplified. These are used for blowing nozzles.

FIGS. 3a and 3b show an entry / exit 8, 9 with a device 15 for reducing the free cross section of the entry / exit. The device 15 has horizontally movable closure elements 12. As closure elements guided in the embodiment of rails plates are used.

FIGS. 4a and 4b show an entry / exit 8, 9 with a vertically adjustable closure element 12 'for reducing the free cross section of the entry / exit. In the exemplary embodiment, a plate guided laterally on rails is used as closure element 12 '. After entering the Löschwagens 1 in the quenching chamber 2, the closure element 12 'is moved down. In this case, the closure element 12 'either reduce the clearance of the Löschwagens or the entrance / exit 8, 9 completely close.

FIGS. 5a / 5b and 6a / 6b relate to devices with multi-element closure elements 13, 14 for reducing the cross section of the entrances / exits during the deletion process. 5a and 5b show an entry / exit 8, 9 for a fire truck 1 to a wet extinguishing tower with a roller shutter 13. In the exemplary embodiment, the roller shutter 13 is located above the entrance / exit 8, 9. If the fire truck 1 is positioned in the extinguishing tower, the roller shutter 13 is moved as close as possible to the boundary profile of the extinguishing agent 1. Optionally, the entry / exit 8, 9 of the wet extinguishing tower can be completely closed.

6a and 6b show an arrangement for intercepting extinguishing swaths, which has a sectional door 14 which can partially or completely close the entry / exit 8, 9 to the extinguishing tower. The sectional door 14 comprises a plurality of plates movably connected to each other. In the exemplary embodiment, multi-section door leaves of the sectional door 14 are moved from two sides into the opening of the entrance / exit 8, 9.

The embodiments described above can be combined with each other. It is advantageous, entrances and exits 8, 9 of a wet extinguishing tower, which are equipped according to the embodiment in Fig. 1 with an air curtain generating device 10 or a suction device 11 according to the embodiment of Fig. 2, in addition to one-piece or multi-member closure elements 12th to provide 15 to reduce the free cross section of the entrances / exits 8, 9 during the deletion process. The combination of the generation of an air flow in front of the entrances / exits 8, 9 and a reduction of the free cross section of the entrances / exits 8, 9 during the extinguishing process proves to be particularly favorable and leads to an effective reduction of leaks. In addition, operating costs can be reduced because the required air flow does not have to be as strong as with a fully open entry / exit.

Claims

claims:

1. A method for reducing leakage at entrances and exits (8, 9) of a wet extinguishing tower in the deletion of hot coke, dadu rc hge ke nn ze zen et that before the entrances and exits (8, 9) one to Ein - / exit substantially parallel air flow is generated.

2. The method according to claim 1, characterized in that air sucked from the environment and is blown horizontally or vertically to produce a the ingress / egress (8, 9) in the height and width covering air curtain.

3. The method according to claim 1 or 2, characterized in that a suction before the entrances and exits (8, 9) is generated.

4. The method according to claim 3, characterized in that extracted mixture is passed into a vent (4) of the wet extinguishing tower.

5. The method according to any one of claims 1 to 4, characterized in that the free cross section of the entrances and exits (8, 9) is reduced during the deletion process.

6. The method according to claim 5, characterized in that the opening of the entrances and exits (8, 9) by a closing movement of a one-piece or multi-part gate element (12, 12 ', 13, 14) is reduced.

7. The method according to claim 6, characterized in that a roller shutter (13) or a sectional door (14) is used.

8. Wet extinguishing tower for extinguishing hot coke with at least one entrance / exit (8, 9) for a fire truck (1), indicating that the wet extinguishing tower comprises means (10, 11) for Generating an air flow in front of the entrance / exit (8, 9), wherein the air flow to the entrance / exit (8, 9) is directed substantially parallel.

9. wet extinguishing tower according to claim 8, characterized in that the means (10) for generating an air flow at least one on the side of the entrance / exit (8, 9) or above the entrance / exit (8, 9) arranged device , which draws in air from the environment and blows out to produce an air curtain covering the entrance / exit (8, 9) in height and width.

10. wet extinguishing tower according to claim 8 or 9, characterized in that the means (11) for generating an air flow having a suction device, which is effective over the width of the entrance / exit (8, 9) and exiting vapor, spray and / or Dust sucks.

11. wet extinguishing tower according to claim 10, characterized in that the suction device (11) comprises at least one hood, lead from the pipes and / or channels in the vent (4) of the wet extinguishing tower.

12. wet extinguishing tower according to one of claims 8 to 11, characterized in that the wet extinguishing tower has a device (15) for reducing the free cross section of the entrance / exit (8, 9).

13. wet extinguishing tower according to claim 12, characterized in that the device (15) multi-member closure elements (13, 14).

14. wet extinguishing tower according to claim 12 or 13, characterized in that the device as a sectional door (14) or roller shutter (13) is formed.