EP1913115B1 - Method and device for cleaning the door of a coke oven - Google Patents

Description

The invention relates to a method for coke oven door cleaning and a device suitable for this purpose.

By coke oven doors a gas-tight completion of the coke oven chamber should be guaranteed. Numerous sealing elements for coke oven doors have been developed for this purpose. The prerequisite for a gastight chamber closure, despite the high level of technical development of the sealing elements, is the careful maintenance of the sealing surfaces on the coke oven door and the door frame.

Both mechanical cleaning devices and cleaning with high-pressure water are known. In the mechanical cleaning brushes, scrapers, scratches and cutters are used. These cleaning devices have the disadvantage that they require a lot of time for the cleaning process and still have only a small cleaning effect, since the cleaning tools can be adapted only conditionally to the surfaces to be cleaned. In addition, there is a risk of damage to the sealing edges. After prolonged use of the mechanical cleaning devices, the sealing edges are worn out in any case. For the rest, the cleaning tools wear off and must be replaced regularly.

When cleaning with high-pressure water, the polluted wastewater is a problem.

From the DE 30 14 124 C2 a cooktop door cleaning apparatus is known which proposes both mechanical and high pressure fluid powered cleaning tools using water or steam to clean the coke oven door.

In this type of cleaning, it is disadvantageous that the cleaning is very complex and you both the disadvantages of mechanical cleaning and cleaning with high pressure water, d. H. has the accumulation of contaminated wastewater.

From the DE 101 61 659 C1 a coke oven door (DMT door) is known, the sealing strips have such a large spring travel that they can adapt to all occurring during the coking process deformations, so that at any time a complete seal is guaranteed. Also with this door, the contamination or cleaning state is of crucial importance for their sealing behavior and thus for the emissions.

The JP 60 23 83 86 A discloses a method and apparatus for cleaning the gas channel of a door plug of a coke oven door. The gas channel of the door plug is cleaned at the top with compressed air and at the bottom with high-pressure water.

The JP 52 00 58 04 A relates to a cleaning device for Fülllochdeckel and Fülllochrahmen of coke ovens by means of nozzles through which a liquid or gas flows. A cleaning of sealing edges of coke oven doors is not disclosed.

From the DD 34 918 A a method for cleaning sealing surfaces of coke ovens, in particular the door frame, doors, filling and leveling holes is known in which the coke breeze is thrown with compressed air on the cleaning surfaces.

The invention has for its object to provide a simple cleaning method and a device suitable for the DMT door available, which is also suitable for other Türabdichtungssysteme.

This object is achieved with regard to the method by the features of patent claim 1 and with respect to the device by the features of claim 14.

Further developments take place according to the features of the subclaims.

The invention is based on the basic idea that the coke oven door is still so warm immediately after opening the coke oven chamber that a temperature of about 130 ° C. to 200 ° C. is present in the region of the sealing edges and the membrane. As a result, the tar deposited on the inside surface of the membrane and in the area of the sealing edges is still so viscous that it can be removed relatively easily with the compressed air. The air, which hits the surface to be cleaned at an acute angle of <45 °, acts like a spatula or scraper. Caking is removed with little effort.

In the simplest case, the jet nozzle element consists of a single jet nozzle.

The spatula or scraper effect of the jet nozzle element and thus the cleaning effect can be further increased by the jet nozzle element of several

There are jet nozzles, which are arranged one behind the other and / or next to each other in the direction of movement.

According to one embodiment, the jet nozzle element consists of a jet nozzle pair with two jet nozzles arranged next to one another. In this case, one jet nozzle cleans the gas channel of the DMT door and the other jet nozzle cleans the inside surface of the membrane.

According to a further embodiment, the jet nozzle element consists of two jet nozzles arranged one behind the other. The first jet nozzle is oriented so that the air hits the surface to be cleaned at an acute angle. The second jet nozzle is aligned so that the air hits the surface to be cleaned at an obtuse angle (approximately 90 °) like a hammer blow. This creates a combination of scraper and hammer blow effect for door cleaning. A combination of hammering and scraper effect is also possible. In this case, place the two nozzles so far apart that the air from the jet nozzle impinges at an acute angle in front of the surface which is cleaned by the jet nozzle at an obtuse angle.

According to a further embodiment, the jet nozzle element consists of a double jet nozzle pair. In this twin-jet nozzle pair, the two front jet nozzles are aligned so that the air hits the surface to be cleaned at an acute angle, while the two rear jet nozzles hit the surface to be cleaned at an obtuse angle.

In addition, the cleaning effect of the at least one jet nozzle element can be increased by applying pulsating compressed air. In this case, a pulsating air flow is generated by pulsator, the pulsation frequency can be adapted to the particular circumstances. A further improvement of the cleaning effect can also be achieved by a rotating air jet, thereby increasing the size of the surface to be cleaned. As a result, an advantageous, hammer-like effect is also achieved.

A combination of pulsating and rotating air jet is also possible.

The cleaning effect of the cleaning method according to the invention can also be increased by reducing the opening cross-sections of the jet nozzles and / or increasing the air pressure through a compressor.

In a preferred embodiment, a single jet nozzle element travels the entire inside surface of the membrane and the sealing edges, while the jet nozzle element is initially driven in the lower door area from the middle to the left and right corner. Subsequently, the entire circumference of the door is traversed and in the lower area, the jet nozzle element is again driven back and / or back.

According to a further embodiment, two jet nozzle elements each depart one half of the coke oven door seals.

In another embodiment, four jet nozzle elements, i. H. two used for vertical and two for horizontal cleaning of the coke oven door.

In order to minimize cooling of the surfaces to be cleaned, in a development of the invention, the nozzle element is moved along the sealing edges, counter to the direction of movement of the air, which impinges on the surface to be cleaned at an acute angle. As a result, a cooling of the still to be cleaned sealing surface is largely avoided.

The device according to the invention consists of a housing into which the coke oven door to be cleaned is driven or placed. In this housing, the at least one movable jet nozzle element is arranged. This housing is located on the printing press or the Koksüberleitmaschine. In this housing, the doors of each serving coke oven are cleaned. Due to the enclosure, the dirt accumulating during the cleaning of the coke oven door can not escape into the atmosphere. Rather, they are collected on the walls and finally on the floor in a drip pan and added to the feed coal batch by batch. For cleaning the inner surfaces of the housing further jet nozzle elements can be arranged. The sump can be covered with a small amount of coal, so that the cleaned tar particles do not cake on the tub; the emptying of the sump is carried out on the printing press such that the tar and coal particles are fed to the grading coal bunker located on the printing press. On the coke side, the drip pan is emptied into a collecting container. The contents of the collection container is then fed to the feed coal. Also for the printing press, the arrangement of a separate collection container is possible.

According to one embodiment of the invention, the door cleaning with the jet nozzle elements in existing mechanical door cleaning devices with brushes, scratches or scrapers can be retrofitted by e.g. the brushes are replaced by a jet nozzle element. This conversion has the advantage that existing cleaning facilities for the inventive method of door cleaning can be used.

With the door cleaning device according to the invention also all known from the prior art sealing systems can be cleaned, such. This is also beneficial for a phase of converting a coke oven plant to the DMT door, where temporary temporary use is made of various door sealing systems. When using double jet nozzle pairs in conventional door seal systems without gas channel, both the inside membrane surface between the door plug and sealing edge and the sealing edge itself are cleaned by the compressed air jet.

So that the warm, viscous tar is not cooled by the air jet, the compressed air is heated according to an embodiment of the invention.

The waste heat available on the coking plant is used to heat the compressed air. Depending on local conditions, the waste heat from the air-cooled push rod or from the exhaust air of air conditioners or from the heat of compression. In this case, the heat can be obtained either by direct suction of the warm air or by a targeted routing of the compressed air through areas that give due to the coking process increased radiant heat.

The compressed air heating can also be done by heating and isolation of a compressed air storage tank. This is possible because the amount of air required to clean a door is so low that the warm-up phase in the time between the door cleaning operations is sufficient to heat the air back to at least 80 ° C preferably> 130 ° C before.

The door cleaning device according to the invention consists of a compressor, which is located on the respective machine, d. H. on the machine side on the press and on the coke side on the coke transfer machine. With this compressor, the air is brought to the required pressure. The compressed air is supplied to a compressed air reservoir. From there, it is conducted via fixed and flexible connection lines to the at least one jet nozzle element. Between the at least one jet nozzle element and the compressed air reservoir are solenoid valves, which are electrically controlled, whereby both the amount of air and the time of the air flow are predetermined accordingly. In the individual supply lines to the jet nozzle elements also pressure regulators are arranged with which the respective jet nozzle pressure can be regulated.

The control of the amount of air, the air pressure and in particular the predetermined with the individual nozzle elements cleaning paths can be made electronically by programming. The control can be carried out via the main PLC (programmable logic controller) of the oven operating machine or by a separate PLC.

The jet nozzle elements are guided over the surfaces to be cleaned at a distance of approx. 5 cm. By this distance, a sufficient tolerance is given, so that distortions of the door seals can be compensated and in contrast to mechanical cleaning devices at all points a good cleaning is guaranteed.

Figur 1

eine schematische Darstellung der Druckluftversorgung der Strahldüsenelemente

Figur 2

ein Strahldüsenelement mit einer Strahldüse mit spitzem Anströmwinkel

Figur 3

ein Strahldüsenelement mit zwei Strahldüsen mit spitzem Anströmwinkel

Figur 4

ein Strahldüsenelement mit zwei hintereinander angeordneten Strahldüsen mit einer Strahldüse mit stumpfem und einer Strahldüse mit spitzem Anströmwinkel

Figur 5

ein Strahldüsenelement als Doppelstrahldüsenpaarelement mit zwei nebeneinander angeordneten Strahldüsen mit stumpfem und davor angeordneten zwei Strahldüsen mit spitzem Anströmwinkel

Figur 6

eine schematische Darstellung des Ablaufes der einzelnen Reinigungsphasen bei dem Verfahren zur Koksofentürreinigung mit vier Doppelstrahldüsenpaaren und

Figur 7

eine nicht beanspruchte Ausführungsform mit einer stationären Anordnung der Strahldüsenelemente

Further details, features and advantages of the subject matter of the invention will become apparent from the subclaims and from the following description of the associated Drawing in which - exemplary - preferred embodiments of the inventive door cleaning devices are shown. On a detailed description and a drawing of cleaning the inside of the housing is omitted. The compilation of the necessary elements is obvious and obvious. In the drawing show:

FIG. 1

a schematic representation of the compressed air supply of the jet nozzle elements

FIG. 2

a jet nozzle element with a jet nozzle with an acute angle of attack

FIG. 3

a jet nozzle element with two jet nozzles with acute angle of attack

FIG. 4

a jet nozzle element with two nozzles arranged one behind the other with a jet nozzle with blunt and a jet nozzle with an acute angle of attack

FIG. 5

a jet nozzle element as a double jet nozzle pair element with two juxtaposed jet nozzles with blunt and arranged in front of two jet nozzles with acute angle of attack

FIG. 6

a schematic representation of the sequence of the individual cleaning phases in the process for Koksofentürreinigung with four double jet nozzle pairs and

FIG. 7

an unclaimed embodiment with a stationary arrangement of the jet nozzle elements

The FIG. 1 shows the compressed air supply of the jet nozzle elements. In a line 1, a compressor 2 is arranged, which compresses the compressed air and pumped into a compressed air tank 3. The compressed air tank 3 is provided with a compressed air tank heater 4. From the compressed air tank 3, the compressed air flows through lines 5 and 5 ', in which pressure regulator 6 and 6' and solenoid valves 7 and T are arranged, in jet nozzle elements 8 and 8 '.

In the FIG. 2 is a side view A, an interior view B and a top view C, the inventive method for coke oven door cleaning with a jet nozzle 10 shown schematically. With the jet nozzle 10 compressed air is blown onto a sealing strip 15 with a sealing blade 16 and on the inside surface of a membrane 17 which is fixed to a coke oven door plate 18 with a door stopper 19 at an acute angle. The beam path of the compressed air is shown by way of example with the beams 11, 12, 13 and 14. The jet 11 strikes the sealing edge 16 of the sealing strip 15. The jet 12 strikes the region where the sealing strip 15 is attached to the membrane 17. The jet 13 strikes the area between the membrane 17 and the door stopper 18. The jet 14 strikes the center of the inside surface of the membrane 17.

From the FIG. 2 shows that the total area between the sealing edge and the Koksofentürplatte is acted upon by the jet nozzle 10 with compressed air and in this way tar deposits are blown away and thus the coke oven door is cleaned.

The FIG. 3 shows a jet nozzle element 8 with two jet nozzles 20 and 20 ', which are directed at an acute angle of attack on the sealing strip 15 to be cleaned with sealing edge 16 (side view A). From the inside view B and the top view C shows that the coke oven door is equipped with a circumferential gas channel 21 with outer sealing strips 15 with sealing edges 16 and inner sealing strips 15 'with sealing edges 16'. The gas channel 21 is attached to the membrane 17 on the Koksofentürplatte 18. As indicated by the jets 11, 12, 13, 14 and 11 ", the jet nozzle 20 cleans the gas channel 21. The jets 11 ', 12', 13 'and 14' indicate that the inside surface of the jet through the jet nozzle 20 ' Membrane 17 is cleaned.

The FIG. 4 shows the cleaning of a coke oven door with a sealing strip 15 with sealing edge 16 and the diaphragm 17 with a blasting nozzle 25 with blunt and a jet nozzle 26 with acute angle of attack. The remaining reference numerals have the same meaning as in the preceding figures. For reasons of clarity, the illustration of the beam paths 11 ', 13' and 14 'of the jet nozzle 25 in the interior view B has been dispensed with.

In the FIG. 5 the cleaning of the DMT door is shown with a double jet nozzle pair element 30. The dual jet nozzle pair element consists of two jet nozzles 31 and 31 ', which are aligned so that the air at an acute angle to the surface to be cleaned and two jet nozzles 32 and 32 'whose jets strike the surface to be cleaned at an obtuse angle.

The remaining reference numerals have the same meaning as in the preceding figures. Again, in the interior view B on the representation of the beams 11 ', 13' and 14 'of the jet nozzles 32 and 32' 'largely omitted.

The FIG. 6 shows the sequence of the door cleaning method according to the invention with four double jet nozzle pairs. Two pairs of double jet nozzles are used for the vertical and two for the horizontal cleaning of the coke oven door. The timing of the cleaning of the four sections is controlled so that the contamination of the already cleaned sealing surface areas by other not completely cleaned areas or by detached impurities is largely avoided. In a first cleaning phase with the cleaning path RW 1, the upper door area is cleaned by an upper double-jet nozzle pair 35. In a second cleaning phase RW 2, the two lateral areas are cleaned starting from the top by pairs of double jet nozzles 36 and 36 'and parallel to the lower area of the surface to be cleaned by the double jet nozzle pair 37. In this case, a double jet nozzle pair 37 is starting from the middle to the left in the lower area and back to the right corner and back to the middle position. In a subsequent third cleaning phase RW 3, the lower area is again cleaned by moving the lower double-jet nozzle pair 37 back and forth to the corners. The cleaning phase RW 3 takes account of the fact that most of the impurities occur at the bottom of the coke oven door.

The FIG. 7 shows the coke oven door cleaning with a stationary arrangement of the jet nozzle elements. The jet nozzle elements are arranged in a housing 40 with a housing outer wall 41 and a housing inner wall 42. The gas channel boundaries 43 and 43 'of the DMT door are indicated by the dashed lines. In the housing, jet nozzles 45, 47 and 49 for cleaning the gas channel and jet nozzles 46, 48 and 50 for cleaning the inside surface of the membrane are arranged as double-jet nozzles, the jet nozzles 45 to 50 directed at an acute angle to the surfaces to be cleaned are. In this case, the double-jet nozzles are arranged at such a distance that the surfaces which are connected to the air of the jet nozzles 45 are applied to 50, slightly overlap with the surfaces which are exposed to the air of the adjacent jet nozzles 45 to 50, overlap. In this way, a cleaning of the entire sealing surface with the stationary jet nozzles 45 to 50 is ensured.

Like from the FIG. 7 As can be seen, the jet nozzles 45 and 46 are starting from the upper left corner of the housing 40, oriented to the right. Starting from the upper right corner of the housing 40, the jet nozzles 47 and 48 radiate downward. From the lower right corner of the housing 40, the jet nozzles 49 and 50 radiate to the left. This arrangement is maintained until just before the center 53 of the housing 40.

On the left side of the housing 40, the jet nozzles 47 and 48 radiate downward starting from the upper left corner. From the lower left corner of the housing, the jet nozzles 45 and 46 radiate to the right. This beam direction is maintained until just before the center 53 of the housing 40. In the upper left corner of the housing 40 additional jet nozzles 51 and 52 are arranged, which act on the surfaces which can not be reached by the jet nozzles 45, 46 and 47, 48.

The cleaning of the coke oven door is done in segments. In this case, a segment usually consists of 10 double-jet nozzles, consisting of the jet nozzles 45 and 46, 47 and 48 or 49 and 50. The jet nozzles have a distance of 11 cm. For coke oven doors of approx. 7.40 m height, such as those used at the coking plant Prosper of Deutsche Steinkohle AG, this means that the cleaning takes place successively in fifteen segments S1 to S15. In a first cleaning phase, the upper segment S1 is cleaned. In this case, by not shown solenoid valves, the compressed air is controlled so that in the upper segment S1 six double jet nozzles consisting of the jet nozzles 45 and 46 which clean the upper horizontal region of the sealing surfaces and the two upper double jet nozzles, consisting of the jet nozzles 47 and 48, the each radiate down and the jet nozzles 51 and 52 are pressurized with compressed air. The further cleaning of the door takes place in the segments S2 to S14, which each consist of five double-jet nozzles for each side, starting from the top to the bottom in the segment S15. There blow the two lower double jet nozzles with the jet nozzles 47, 48 down and the jet nozzles 45, 46 and 49, 50 respectively in the direction of the center 53 of the housing 40. Since accumulate due to the selected blowing directions in the lower segment S15, the impurities is extended the cleaning cycle in this segment. The cleaning time is fifteen seconds in segments S1 to S14 and thirty seconds in segment S15. This results in a total cleaning time of four minutes. Since the time from lifting to reinserting the coke oven doors is about 5 minutes, the cleaning process does not lead to a delay in the operation. In this type of cleaning a complete cleaning of the coke oven door with relatively low compressor capacity is possible. In addition, contamination of the already cleaned sealing surface areas during door cleaning by detached contaminants is largely avoided.

The basic idea of the invention that the coke oven door must be cleaned immediately after opening the coke oven chamber, because due to the temperature of the coke oven door tar deposited in the sealing edges is still so viscous that it can be relatively easily removed with compressed air, was by the following experiments demonstrated. First, the temperature profile of the tar was recorded in the gas channel of the DMT door during coking plant operation. The temperatures were determined both immediately after the opening process and after a cooling phase of about 5 minutes. To simulate the cooling of the coke oven door by the cleaning method according to the invention with compressed air, the corresponding areas of the coke oven door were subjected to compressed air during the cooling phase. The temperatures in the gas channel before the cooling phase were between 180 ° and 200 ° C and after the cooling phase between 140 ° and 160 ° C. The tar was always liquid. During the short cooling phase, however, it became more viscous the lower the temperature was.

• Ein ca. 50 cm langes Stück des Gaskanals mit Membrane wurde aus einer Original-Türdichtung herausgetrennt und mit Schraubzwingen horizontal auf eine Heizplatte montiert. Anschließend wurden der Gaskanal und die Membranoberfläche mit einer konstanten Teermenge aus dem Türbereich einer Kokereianlage beaufschlagt. Dieser Teer wurde mittels der Heizplatte auf ca. 135°C erwärmt. Zur Abreinigung des Teeres wurde sowohl eine Kompaktstrahldüse als auch eine Flachstrahldüse in einem vorgegebenen Abstand von 3 - 5 cm und einem Winkel von ca. 40° über den Bereich des Gaskanals und der Membrane verfahren. Dabei betrug der Luftdruck stets 10 bar. Durch Rückwägung des abgereinigten Segments (Gaskanal und Membranstück) wurde die Reinigungsleistung bestimmt. Die Ergebnisse sind in Tabelle 1 aufgeführt.

Tabelle 1: Reinigungsversuche mit Luftstrahldüsen und heißem Teer VersuchNr. Düsenart Abstand Düse-Gaskanal Anströmwinkel Teertemperatur Teermenge Reinigungsleistung vor Reinigung nach Reinigung (g) (%) (mm) (°) (°C) (g) (g) 1 kompakt 50 40 133 30 3 27 90 2 kompakt 50 40 131 30 3 27 90 3 flach 50 40 134 30 35 26,5 88 4 kompakt 30 40 133 30 2 28 93 5 kompakt 30 40 135 30 1,5 28,5 95 6 flach 30 40 135 30 4 26 87 7 kompakt 30 40 135 30 3 27 90 8 kompakt 30 40 134 30 2 28 93 9 kompakt 30 40 134 30 1,5 28,5 95 10 flach 30 40 133 30 4 26 87 After recording the temperature profile, experiments were carried out in the technical center as follows:

• An approximately 50 cm long piece of the gas channel with membrane was cut out of an original door seal and mounted horizontally on a heating plate with screw clamps. Subsequently, the gas channel and the membrane surface were charged with a constant amount of tar from the door area of a coking plant. This tar was heated to about 135 ° C by means of the hot plate. For cleaning of the tar, both a compact jet nozzle and a flat jet nozzle at a predetermined distance of 3 - 5 cm and an angle of about 40 ° over the region of the gas channel and the membrane method. The air pressure was always 10 bar. By weighing the cleaned segment (gas channel and membrane piece), the cleaning performance was determined. The results are shown in Table 1 .

<b> Table 1: Cleaning tests with air jet nozzles and hot tar </ b> VersuchNr. Nozzle Distance nozzle-gas channel angle of attack Teertemperatur amount of tar cleaning performance before cleaning after cleaning (G) (%) (mm) (°) (° C) (G) (G) 1 compact 50 40 133 30 3 27 90 2 compact 50 40 131 30 3 27 90 3 flat 50 40 134 30 35 26.5 88 4 compact 30 40 133 30 2 28 93 5 compact 30 40 135 30 1.5 28.5 95 6 flat 30 40 135 30 4 26 87 7 compact 30 40 135 30 3 27 90 8th compact 30 40 134 30 2 28 93 9 compact 30 40 134 30 1.5 28.5 95 10 flat 30 40 133 30 4 26 87

As Table 1 shows, cleaning performances of about 90 to 95% were generally achieved.

In a further series of experiments, the cleaning performance was determined with further cooled tar. For this, the tar was first heated to 135 ° C and cooled again to about 100 ° C, before the cleaning was carried out by means of compressed air. The results are shown in Table 2 . <b> Table 2: Cleaning tests with air jet nozzles and cooled tar </ b> Experiment No. Nozzle Distance nozzles - gas channel Anströlmwinkel Teertemperatur amount of tar cleaning performance before cleaning after cleaning (G) (%) (mm) (°) (° C) (G) (G) 1 compact 30 40 135/105 30 22 8th 27 2 compact 30 40 135/105 30 24 6 20 3 compact 30 40 134/100 30 25.5 4.5 15 4 compact 30 40 135/100 30 25 5 17 5 compact 15 40 133/90 30 28 2 7 6 compact 15 40 134/90 30 29 1 3 7 compact 15 40 135/100 30 28 2 7 8th compact 15 40 134/100 30 26 4 13 9 flat 30 40 135/100 30 25 5 17 10 flat 15 40 135/100 30 23 7 23

As can be seen from Table 2, significantly lower cleaning performance was achieved in the cooled and thus hardened tar. They are on the order of <30% cleaning performance.

From these experiments it could be concluded that the still hot, liquid tar, which adheres to the door seals shortly after the opening process during the coking operation, can be easily cleaned with compressed air, which meets at an acute angle to the surfaces to be cleaned. Small, uncleaned tar residues in the gas channel do not affect the sealing effect of the DMT door. It is expected that a complex basic cleaning z. B. by sandblasting only after a longer period of about 18 months should be required. In the method according to the invention for coke oven door cleaning, the disadvantages of the door cleaning method according to the prior art occur The technology, such as damage and wear on the sealing surfaces by scratches, or the processing and handling of wastewater as in cleaning with water jet nozzles not on.

Embodiment:

The device according to the invention for door cleaning consists of four double jet nozzle elements, which are designed as double jet nozzle pairs, wherein in each case a jet nozzle in the blunt and a jet nozzle is directed at an acute angle to the surfaces to be cleaned. Two pairs of twin jet nozzles are used for the horizontal and two twin jet pairs for the vertical door areas. The door is placed immediately after opening the coke oven chamber in the housed cleaning device, so that on the one hand a rapid cooling of the surfaces to be cleaned and on the other pollution of the machine area is avoided by the detached during cleaning tar and coke particles. The enclosure is connected in the upper area to a fume hood, which is connected to the existing extraction system, so that the contaminated compressed air does not escape into the atmosphere. In the lower area is a drip pan in which the separated tar particles are collected. The timing of the cleaning of the four sections is controlled so that the contamination of the already cleaned sealing surface areas by other not yet completely cleaned areas or removed contaminants is largely avoided.

In a first cleaning phase, the upper door area is cleaned by the upper double jet nozzle pair. In a second cleaning phase, the two lateral areas are cleaned starting from the top and parallel to the lower area of the surface to be cleaned. The double jet nozzle pair is driven from the middle to the left and right corner at the bottom and returned to the middle position. In a subsequent third cleaning phase, the lower area is again cleaned by reciprocating the lower twin jet nozzle pair from the left to the right corner, starting from the center.

In order to optimize the cleaning of the tar and coke-contaminated areas of the door seals, the air is compressed by means of a compressor to a sufficient pre-pressure and then mixed with inserts in the jet nozzles in pulsation and rotated. These measures ensure that the compressed air jets can clean all areas of both the gas channel and the inner membrane surface.

Since it was determined on the basis of the preceding experiments that optimum cleaning takes place at temperatures above 130 ° C., the compressed compressed air in the pressure vessel is preheated to about 130 ° C. by means of jacket heating and insulation. The heating is designed so that in the period between the individual Koksausdruckvorgängen the amount of air in the pressure vessel is reheated.

By heating the interior walls of the enclosure, the separated tar is kept liquid so that it can drain and be absorbed by the drip pan attached to the floor.

With the cleaning device according to the invention, the door was reliably cleaned so well that a complete sealing of the coke oven chamber was ensured by the DMT door at any time during the coking process. Emissions due to leaking coke oven doors could not be observed.

LIST OF REFERENCE NUMBERS

1

management

2

compressor

3

Air receiver

4

Pressure Container heater

5

management

5 '

management

6

pressure regulator

6 '

pressure regulator

7

magnetic valve

7 '

magnetic valve

8th

Nozzle element

8th'

Nozzle element

10

jet

11

beam

11 '

beam

11 "

beam

12

beam

12 '

beam

12 "

beam

13

beam

13 '

beam

14

beam

14 '

beam

15

sealing strip

15 '

sealing strip

16

seal edge

16 '

seal edge

17

membrane

18

Koksofentürplatte

19

door plug

20

jet

20 '

jet

21

gas channel

25

jet

26

jet

30

Double nozzle pair member

31

jet

31 '

jet

32

jet

32 '

jet

35

Double nozzle pair

36

Double nozzle pair

36 '

Double nozzle pair

37

Double nozzle pair

40

casing

41

Housing outer wall

42

Housing inner wall

43

Gas channel limits

43 '

Gas channel limits

45

jet

46

jet

47

jet

48

jet

49

jet

50

jet

51

jet

52

jet

53

center

A

sideview

B

inside view

C

Top view

RW 1

cleaning phase

RW 2

cleaning phase

RW 3

cleaning phase

S1

segment

S2

segment

S3

segment

S4

segment

S5

segment

S6

segment

S7

segment

S8

segment

S9

segment

S10

segment

S11

segment

S12

segment

S13

segment

S14

segment

S15

segment

Claims (19)

1. A method for cleaning a coke oven door which has sealing edges, and membranes fastened to the coke oven door plate, in which cleaning tools with jet nozzles, which tools are supplied with high-pressure flow medium, are moved back and forth in the region between the sealing edges and the coke oven door plate such that the inside surface of the membranes and the sealing edges are cleaned, characterised in that the coke oven door is cleaned immediately after the coke oven chamber has been opened, in that at least one jet nozzle element which is supplied with compressed air is moved along the sealing edges, which as a result of the immediate treatment are at a temperature of 130°C to 200°C, and the jet nozzles are oriented such that the air strikes the surface to be cleaned at an acute angle of < 45° and is moved across all the surfaces to be cleaned.
2. A method according to Claim 1, characterised in that two jet nozzle elements are moved over one half in each case of the surfaces to be cleaned.
3. A method according to Claim 1, characterised in that four jet nozzle elements are moved across the surfaces to be cleaned, with two jet nozzle elements being used for cleaning the vertical surface portions and two jet nozzle elements for cleaning the horizontal surface portions.
4. A method according to Claims 1 to 3, characterised in that the coke oven door is moved, immediately after the coke oven chamber has been opened, into a housing in which the jet nozzle elements are arranged.
5. A method according to Claims 1 to 4, characterised in that the air is compressed with a compressor.
6. A method according to Claims 1 to 5, characterised in that the air is heated.
7. A method according to Claims 1 to 6, characterised in that the control of the quantity of air is effected by solenoid valves, that of the air pressure by pressure regulators and that of the cleaning paths by drives, electronically by programming.
8. A method according to Claims 1 to 7, characterised in that the compressed air during the cleaning operation is extracted from the housing by an extraction device and the tar cleaned off is collected in a collecting tank.
9. A method according to Claims 1 to 8, characterised in that the housing is heated.
10. A method according to Claims 1 to 9, characterised in that the jet nozzle elements are heated.
11. A method according to Claims 1 to 10, characterised in that the compressed air is caused to pulsate.
12. A method according to Claims 1 to 11, characterised in that the compressed air is caused to rotate by the jet nozzle element.
13. A method according to Claims 1 to 12, characterised in that the compressed air is caused both to pulsate and to rotate.
14. A device for carrying out the method according to Claim 1, characterised in that the at least one jet nozzle element is arranged in a housing (40) and is connected to a compressor (2), to a compressed-air reservoir (3) via a line (5), to a pressure regulator (6) and a solenoid valve (7), this housing being located on the pusher machine or the coke transfer machine.
15. A device according to Claim 14, characterised in that the at least one jet nozzle element consists of a jet nozzle (10).
16. A device according to Claim 15, characterised in that the at least one jet nozzle element consists of a twin jet nozzle (20), (20').
17. A device according to Claim 14, characterised in that the at least one jet nozzle element consists of a pair (35), (36) of twin jet nozzles.
18. A device according to Claims 14 to 17, characterised in that an extractor hood and a collecting tank are arranged on the housing (40) for the jet nozzle elements.
19. A device according to Claims 14 to 18, characterised in that jet nozzle elements are provided for cleaning the inner housing surfaces of the housing (40).

Images