Patent Application
20120118721
The invention relates to a device for compensating deviations from a coaxial arrangement of components of a regulating organ, said regulating arrangement being comprised of a regulating organ, a crown pipe, and an immersion cup which serve for controlling the gas pressure of a coke oven chamber, with the regulating arrangement being comprised of an immersion cup with a water immersion that seals the gas space of a coke oven chamber versus the gas collecting main and/or plant units downstream, and wherein the height of the water level of the water immersion represents a regulating means to control the gas pressure, and wherein said regulating arrangement is furthermore comprised of an immersion pipe that configures a specially shaped crown pipe at its end submerging into the water of the immersion cup, and that is comprised of a regulating organ to regulate the water level. The invention ensures that there occur no deviations in the concentric configuration of the regulating arrangement and that the lock plug of the regulating organ always moves centrically and tightly sealing into the envisaged sealing seat of the lock plug of the immersion cup.
On operation of coke oven chambers, a coking gas is produced which in general streams into the free gas space above the coke cake and which is conducted from there to further processing stages. The coking gas is obtained at a certain pressure which depends on the temporal course of the coal carbonization process. In general, the temporal course of the gas output from a coke oven chamber during the carbonizing cycle takes a well predictable course. As this course is not constant but dependent on the momentary stage of the carbonizing process, pressure fluctuations occur in the coke oven chamber gas space during the carbonizing process.
However, efforts are pursued to keep the gas pressure in the free gas space above the coke oven chamber as constant as possible throughout the entire duration of coal carbonization. Some configurations also permit an increase in gas pressure towards the end of the carbonizing cycle. In particular, however, efforts are pursued to rate the gas pressure in the coke oven chamber always at such a level that no ambient air is sucked into the oven, which can be achieved by ensuring that a slightly positive pressure versus the exterior atmosphere is always maintained by way of a suitable regulation of the gas pressure in the entire coke oven chamber.
For this reason, there are regulating devices by means of which the pressure of a coke oven chamber can be kept constant or be controlled, too, during the entire carbonizing process. An exemplary configuration for this purpose provides for conducting the coking gas to be discharged from a coke oven chamber through a water volume configured as a water immersion so that the gas pressure in the coke oven chamber is regulated by the level of the water immersion and by its pressure. Located above the water immersion is the gas space of a so-called gas collecting main which represents a collecting tank for discharged coking gas and which is constantly filled with a sump amount of water through the water flowing over from the immersion cup. As the pressure in the coke oven chamber and the pressure in the gas collecting main can be separated from each other by way of this design, the suction from the gas collecting main can be improved, thus enabling a better processing of coke oven gas and achieving reductions in emissions on the whole.
An exemplary design and the method applied thereby is disclosed in EP 649455 B1. The gas space of a coke oven chamber is connected to an ascension pipe which terminates into an ascension pipe elbow configured as an immersion pipe, said elbow submerging into a cup-shaped lock seal. This cup-shaped lock seal which is also designated as an immersion cup is filled with water through a coal water line. The coal water line is regulated via a regulating valve which dependent on pressure conditions in the coke oven chamber maintains the water level in the immersion cup at a precisely definable level. As this device can be provided for each individual coke oven chamber, it is thus possible to regulate the gas pressure in each individual coke oven chamber and to control the output of coking gas over the entire coke oven battery or coke oven bank via the time or to keep it constant. At its submerging end, the immersion pipe is provided with a special shape to prevent that an edge running in parallel to the water level leads to an over-swinging of the pressure control and to a pulsation of the immersion seal.
An advanced development of this device is described in US 2004/0084293 A1. Here the immersion pipe terminates in an immersion cup having an outlet similar to a drain outlet. It can be sealed with a plug-like control valve that can be moved by a motion bar leading through the immersion pipe into the drain outlet. In this manner, the drain outlet can be sealed so that the so-called immersion bucket taking charge of the function of the immersion cup constantly has a precisely controllable height of the water level. The coke oven chamber is equipped with pressure measuring devices by way of which the height of the motion bar and thus the water level in the immersion cup are controlled. Since the quantitative output of coke oven gas takes a similar course over the time during a carbonizing cycle, it can be recorded by a process computer so that modifications to the temporal adjustment of the motion bar in the course of the subsequent carbonizing cycles are small.
This system has a disadvantage in that the ascension pipe and the motion bar contained therein including the lock plug of the drain outlet may change in position in the envisaged sealing seat during the operation of the system. For example, this is due to expansion processes or settlement processes in the coke oven chamber caused by fluctuations in temperature during operation. As a result hereof, the lock plug fails to seal tightly so that the water level in the immersion cup is no longer reliably controllable during operation. In particular, for example, the motion bar might be bent or the immersion cup might be dislocated laterally. This leads to a non-controlled change of the water level in the immersion cup and thus to a no longer controllable pressure in the coke oven chamber.
Now, therefore, it is the object to provide a device by means of which a reliably lockable control and regulation for the water level of an immersion cup is feasible. In particular, this means that the immersion pipe with the immersing end is not shifted versus the gas collecting main with the immersion cup.
The invention solves this task by providing for a device comprised of an immersion cup fastened by holders to the top of the gas collecting main and being deflectable so that the immersion cup can be spatially moved, while at the same time place-keeping elements preventing a dislocation of the immersion cup versus the immersion pipe are fastened to the inner side of the immersion cup or to the outer side of the immersion pipe. In this manner, the sealing cup is spatially flexible versus the gas collecting main and thus versus the coke oven chamber in case of expansion or settlement processes, whereas the immersion cup is spatially fixed versus the immersion pipe.
The movable holders can be formed, for example, by wire ropes or chain links, whereas the place-keeping elements are formed by metal sheets or bolts fastened either to the inner sides of the immersion cup or to the outer sides of the immersion pipe. The submerging end of the immersion pipe can be designated as a crown pipe, because it is provided with a shape that prevents pulsation as gas streams into the immersion cup.
Claimed in particular is a device for controlling and regulating the gas pressure of a coke oven chamber, said device comprised of
The device is so configured that the immersion cup is fastened at its upper end with ropes or bars or comparable devices by way of which these are fastened to the top of the gas collecting main or to the immersion pipe. These devices are holding bars which in their extension contain a deflectable or expandable chain piece or wire rope piece. The immersion cup is fastened to at least three of these devices in order to ensure safe retention of the immersion cup in the gas collecting main. Typically these are three devices, but it may also be four or five devices. It is possible to provide any arbitrary number of these holding devices to fasten the immersion cup in the gas collecting main.
This design is intended to prevent that the immersion cup is pulled along whilst actuating the regulating organ, because the lock plug of the regulating organ might get stuck at the sealing seat of the immersion cup due to tar deposits originating from coke oven gas condensates. For this reason, the place-keeping elements in general are only deflectable in horizontal direction. Therefore, it is also feasible to provide hold-down elements that restrict the free mobility of the immersion cup in vertical direction. For example, hold-down elements may be screw unions in the suspension of the immersion cup at the top of the gas collecting main which restrict the mobility of the suspension of the immersion cup.
At their outer rims, the immersion pipe and, more particularly, the crown pipe are equipped with guiding elements. These guiding elements may be bolts projecting from the outer side of the ascension pipe or crown pipe. For example, these elements may be adjustable in their size or length relative to the crown pipe. Thereby, the distance between crown pipe and immersion cup can be maintained at a precisely defined measure.
However, the guiding elements may also be fastened to the inner side of the immersion cup. For example, the inner rim of the immersion cup may be provided with elements that ensure a precisely defined distance between crown pipe and immersion cup during the entire coal carbonization process. These, too, may be adjustable in their size or length relative to the immersion cup.
Finally, it is possible to fasten the guiding elements on both sides, i.e. both on the outer side of the crown pipe and on the inner side of the immersion cup. Consequently, these elements project in pairs both from the inner side of the immersion cup and from the outer side of the crown pipe. Here, too, it is possible that at least one of the bolts is adjustable in its size or spatial extension in relation to the immersion cup or crown pipe.
The guiding elements may be metal sheets, for example. These may have a planar shape. However, the guiding elements may also be bolts or pipe section, for example.
The regulating organ may also be of any arbitrary configuration. Preferably it is a motion bar which a lock plug is fastened to at its lower end. Integrated into the motion bar is a control element for the water flow by means of which the water level in the immersion cup can be controlled and regulated, for example depending on the control signals received from a process computer.
In particular, it is possible to use a regulating organ which for example is described in EP 1390440 B1, wherein an immersion pipe is utilized that is connected to the free gas space of a coke oven chamber and which terminates in the immersion cup, said immersion cup having an overflow as well as a lockable drain, and wherein the immersion pipe is configured with a terminal section, the free gas outlet cross-section of which is dependent on the liquid level in the immersion cup. The liquid level is regulated by a discharge pipe for water, the end of which at one side protrudes into the immersion pipe, and which is comprised of shell-side inflow apertures for the inflow of water, and wherein a slide gate open at both sides is arranged within the discharge pipe, said slide gate locking the inflow apertures of the discharge pipe according to its position in longitudinal direction and forming a vertically adjustable overflow for the water streaming into the discharge pipe, and wherein the end of the discharge pipe on the inflow side is surrounded by a siphon pipe which seals the discharge pipe at the top and forms an annular channel terminating beneath the immersion pipe into the immersion cup to allow for the inflow of water.
The invention bears the advantage in that it ensures a flexible arrangement of the immersion cup in a gas collecting main which is flexible versus expansion and settlement processes, for example due to temperature impacts, and which nevertheless ensures a constant distance between immersion cup and crown pipe.
The inventive device is elucidated by way of five drawings, with these drawings just representing exemplary embodiments for the design of the inventive device.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2009 023 222.2 | May 2009 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2010/002578 | 4/27/2010 | WO | 00 | 1/26/2012 |
