DE102015000930A1 - Apparatus and method for cleaning contaminated coke fire water - Google Patents

Abstract

The present invention relates to a device for cleaning contaminated coke-drying water, comprising a collecting container (2) for receiving contaminated coke-drying water and a cleaning device (4) for separating particles from the coke-drying water, wherein the cleaning device (4) contains filter means (4.1) for cake filtration ,

Description

Technical area

The present invention relates to a device for the purification of coke fire water according to the preamble of claim 1. Furthermore, the present invention relates to a method for the purification of coke fire water according to the preamble of claim. 9

Technical background

In conventional coking plants, spent coke fire water used during a wet-extinguishing operation (contaminated with coke solid particles) is supplied to a settling tank through a fire extinguishing trough having a corresponding free fall. In sedimentation tanks, the sedimentable solid particles settle on the ground after a residence time. The solid particles deposited on the bottom are discharged by so-called coke brewers, which deposit the collected solid particles on a coke saline plateau for further dewatering. The thus cleaned or clarified coke fire water then passes through for further purification through coke filter boxes in a clean water tank, from which it is pumped for reuse as extinguishing water to the extinguishing tower of a coking plant. This process for the purification of coke extinguishing water reaches its limits insofar as that with larger quantities of extinguishing water required for the fire water basin (defined by length and width) Absetzfläche (and thus the corresponding volume) grows accordingly - provided that to achieve the same clearing effect of used Löschwassers the residence time in the fire water tank remains unchanged - and such an increase in volume due to local conditions is often not feasible.

Furthermore, from the DE 10 2011 118 937 A1 and the DE 10 2004 003 492 A1 Already known methods and apparatus for the purification of coke-fire water, wherein the used, contaminated coke-drying water is freed by means of a hydrodynamic cleaning device, using a hydrocyclone from the coke solid particles.

Summary of the invention

The invention is therefore based on the object to provide an alternative device or an alternative method for cleaning used, contaminated coke extinguishing water. In particular, a device or a method is to be specified, whereby an efficient and effective cleaning of used coke fire water is made possible with the simplest possible technical means.

This object is achieved by a device having the features of patent claim 1 and a method having the features according to patent claim 9.

According to the invention, the used and contaminated coke extinguishing water to be received in a collecting container of the device and then cleaned by a cleaning device for separating the coke solid particles, the cleaning of the contaminated Kokslöschwassers here by the use of (in other technical fields in itself) known filter devices for Cake filtration takes place, and the extinguishing water is freed by filtration of the entrained in the extinguishing water Koksfeststoffpartikeln. Cake filtration in the sense of the invention is understood as meaning a filtration in which a filter medium (such as a filter screen and / or a filter cloth or the like) of a filtration device is provided with a so-called filter cake and the filter cake applied to the filter medium during filtration itself as a filter medium or part of the filter medium (newly formed from filter medium of the filter device and cake filter) (for example referred to as hybrid filter medium).

Disc filters (disk filters), drum filters (drum filters) or disk filters are considered as preferred filter devices, whereby a filter device designed as a disk filter (pan filter) is particularly preferably used. Filtering devices of this type are offered for example by the company BOKELA GmbH.

Advantageously, a conveying means is arranged between collecting basin and cleaning device in order to convey the contaminated, used coke-drying water from the collecting container into the cleaning device. This, suitable for liquids such as contaminated coke fire water, conveying means is advantageously designed as a pump. Alternatively, however, the conveying means may also be designed in the form of a screw conveyor, bucket conveyor or the like. In another embodiment, the device can also be carried out without a conveying means if sufficient space is provided between the collecting basin and the cleaning device and the coking extinguishing water can be supplied to the cleaning device on the basis of an existing height difference.

Advantageously, the collecting container with Absetzverhinderungsmitteln, such as a stirrer or the like, equipped so that settling of the coke solid particles is effectively prevented in the collecting container - finally, the Coke solid particles are not removed by settling but by cake filtration from the coke fire water. In an alternative development (without anti-settling agent) of the invention or as additional equipment (with additional anti-settling agents) for this purpose, the collecting container is provided with discharge means, such as a screw conveyor or the like, in order to remove the coke solids particles intentionally or unintentionally deposited in the collecting container from the collecting container , This is to ensure that any existing pump to promote the polluted Kokslöschwassers always only a liquid mixture below a certain Koksfeststoffpartikelgehalts is supplied for promotion, whereby clogging of the pump and increased wear of the pump should be prevented.

The filter means used in the filter device can also be formed or developed as a vacuum filter or pressure filter, which can accelerate the cleaning process in a particular case once again or can increase the degree of dryness of the coke solid particles filtered out coke.

In one embodiment of the invention, the device according to the invention for the purification of contaminated coke dry water is part of a coking plant, wherein the collecting container is formed by a Löschturmtasse a quenching tower of the coking plant.

The method according to the invention for purifying coke-fire water is characterized in that, after feeding coke-extinguishing water into a cleaning device during a coke-quenching process (wet-quenching of coke using coke-extinguishing water), the coke-extinguishing water is cleaned by cake filtration. Advantageously, the cleaning of the coke liquor is carried out using a filter medium designed as a disk filter or drum filter or disk filter. Advantageously, the coke-drying water to be filtered by filtration, before it is fed to the device for cleaning, is mixed with a filter aid for initiating a so-called flocculation process. The flocculant enlarges (flocculates) smaller suspended particles in the firefighting water and promotes cake filtration. Particularly preferably, during the cleaning process, at least temporarily, the used coke fire-extinguishing water collected in the collecting container and intended for cleaning is kept in motion by means of anti-settling means, so that settling of the coke solid particles is effectively prevented. Alternatively or in addition to the process step of "keeping in motion" the used coke liquorizer, the collecting container can be kept clean by discharging optionally deposited coke solid particles (eg by means of a screw conveyor) and it can be prevented that the optionally present pump has a liquid mixture with one high proportion of coke solids particles is supplied.

Brief description of the drawings

In the following the invention will be explained in more detail with reference to drawings. In detail show:

1 the inventive device for the purification of coke-fire water according to a first embodiment in a schematic representation,

2 the cleaning device of the device according to the invention in a preferred embodiment in a schematic representation,

3 the inventive device for cleaning coke fire water according to a second embodiment in a schematic representation.

Description of the Preferred Embodiments

1 shows the device according to the invention for the purification of contaminated (used) coke fire water in a highly schematic representation. The device comprises a collecting container 2 for receiving contaminated coke-drying water, which is the collecting container 2 from the extinguishing tower of a coking plant (not shown, position A) is fed, and a cleaning device 4 for removing the coke solids particles present in used, contaminated coke fire water. Furthermore, in the illustrated embodiment, the device comprises a conveying means designed as a pump 6 for the promotion of the collection container 2 Collected used coke discharger into the cleaning device 4 , The collection container 2 is with a designed as a stirrer Absetzverhinderungsmittel 2.1 and with a discharge means designed as a screw conveyor 2.2 equipped, which is to be avoided by the agitator settling of the coke solid particles and wherein on the screw conveyor possibly existing settled Koksfeststoffpartikel (Koksgruß) from the collecting container 2 can be removed.

The in the container 2 Collected coke fire water is pumped by the pump 6 the cleaning device 4 fed, in which it by means of filters 4.1 is purified from the coke solids particles. The over the filter means 4.1 Filtered coke solid particles or the filtered Koksgruß be / is transported via conveyors for further processing (position B), while the purified coke extinguishing water via appropriate pumps or the like also his other Used as fresh coke fire water in the process (position C).

In 2 is the cleaning device 4 or a filter agent 4.1 the cleaning device 4 shown in a schematic way. The filter medium 4.1 is designed as a plate filter. The plate filter is of conventional design and has a filter medium driven by a motor M filter plate 4.11 on. The filter plate 4.11 is usually covered with a filter cloth. Functionally, the disk filter can be assigned different filter segments or partitions, among which the filter disk 4.11 turns away at a predetermined speed. The filter plate 4.11 is using the pump 6 via a piping system 4.12 fed in a first filter segment, the contaminated extinguishing water. With each coke extinguishing process, the plate filter is fed with such a large amount of contaminated coke extinguishing water, so that after a short time (from the Koksgruß the extinguishing water of a single extinguishing) a filter or Koksgrußkuchen predetermined thickness on the filter plate 4.11 established. In practice, about 10 coke quenching processes will be carried out within one hour (ie an extinguishing process approximately every six minutes). In a second filter segment, the supplied contaminated extinguishing water is filtered and discharged the purified coke-drying water, while in other filter segments, the filtered, remaining on the filter plate coke solids particles (coke cake) dried and by means of transport 4.13 be transported away. For this example, a discharge bridge can be used, which in a presettable height above the filter plate 4.11 and removes material of the forming coke cake above the preset thickness (of, for example, 25-70 mm).

In the manner described above, a Koksgrußkuchen desired thickness is built up after a short time, even when first or re-start without built Koksgrußkuchen, so that after a short time the desired cake filtration occurs.

In 3 the device according to the invention for the purification of coke fire water contaminated by a wet extinguishing process of coke is shown as a constituent component in a coking plant. Here is the collection container 2 formed by the extinguishing cup of a quenching tower of a coking plant. The water obtained from the wet-erase process is fed either directly or via a fire truck the extinguishing tower cup and a fire extinguishing channel or a piping system 4.12 , due to an existing gap between extinguishing tower cup and cleaning device 4 , the cleaning device 4 fed. For the further description with regard to the cleaning device is at this point to the description 2 directed.

LIST OF REFERENCE NUMBERS

2

receptacle

2.1

antisettling

2.2

discharging means

4

cleaning device

4.1

filter means

4.11

filter plates

4.12

Piping

4.13

Mode of Transport

6

funding

M

engine

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011118937 A1 [0003]
• DE 102004003492 A1 [0003]

Claims (10)

Device for cleaning contaminated coke-drying water, comprising - a collecting container ( 2 ) for receiving contaminated coke-drying water, and - a cleaning device ( 4 ) for the separation of particles from the coke-extinguishing water, characterized in that - the cleaning device ( 4 ) Filter means ( 4.1 ) for cake filtration. Device according to claim 1, characterized by - conveying means ( 6 ), in particular designed as a pump, for conveying the extinguishing water from the collecting container ( 2 ) into the cleaning device ( 4 ). Device according to one or more of claims 1 or 2, characterized in that - the collecting container ( 2 ) Antisettling agent ( 2.1 ), in particular comprises a stirrer. Device according to one or more of the preceding claims, characterized in that the collecting container ( 2 ) Discharge means ( 2.2 ) for discharging settled solid particles, in particular having a screw conveyor. Device according to one or more of the preceding claims, characterized in that the filter means ( 4.1 ) are designed as a disc filter or drum filter or plate filter. Device according to one or more of the preceding claims, characterized in that the filter means ( 4.1 ) are designed as a vacuum filter or pressure filter. Device according to one or more of the preceding claims, characterized in that the filter means ( 4.1 ) are formed as disk or disk filter, wherein the filter surface is divided into at least three different circle segments, wherein a filter segment, the filtering of the extinguishing water, a filter segment, the drying of the filtered solid material and a filter segment, the removal of the filtered and dried solid material done. Coke plant comprising a device for the purification of coke-extinguishing water according to one or more of the preceding claims 1-7, characterized in that the collecting container ( 2 ) is formed by a quench tower cup of a quench tower. A method of purifying coke fire water comprising the following steps: - supplying coke fire water collected during a coke quenching process to a scrubber ( 4 ), and - cleaning the coke liquor by means of cake filtration. Method according to the preceding claim 9, characterized in that - during the cleaning process, at least temporarily, in the collecting container ( 2 ) and used for cleaning used coke fire water is kept in motion.

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