DE1266267C2 - Method and device for removing oily deposits from the inner surfaces of container walls by washing the walls with a cleaning fluid - Google Patents

Description

GERMAN PATENT OFFICE German class: 6f-l PATENT LETTERING

Number: 1266 267

File number: J23423III / 6f

1 266 267 Filing date: March 26, 1963

Opening day: April 18, 1968
Issue date: November 28, 1968
The patent specification corresponds to the patent specification

The invention relates to a method and a device for removing oily deposits from the Inner surfaces of container walls by washing the walls with a cleaning liquid, wherein the mixture of cleaning liquid and oily deposits is drawn out of the container and placed in is separated again in a separation container.

In the known methods of this type, the dirty cleaning fluid is removed from the one to be cleaned Container pumped directly into the separation container. Since the liquid is in the one to be cleaned If the container is inconsistent, the result is an uneven flow through the separating container, whereby the separation process is impaired. If the cleaning liquid leaving the separation tank is used again immediately for further tank cleaning, the uneven inflow has an effect to the separating tank also has an unfavorable effect on tank cleaning.

The object of the invention is to avoid a fluctuating ao flow velocity in the separation container.

The invention consists in that the mixture before its entry into the separation container by a converting fluctuating flow velocity into a substantially constant velocity Expansion tank is passed, in which the greater part of the mixture is in an oily upper layer and an oily-aqueous intermediate layer separates, with coarser deposits than bottom sludge settle, while the finer separation of the oily-aqueous mixture into OI and cleaning fluid takes place in the separation tank.

The advantage of the invention is that the equalizing tank connected between the tank to be cleaned and the separating tank acts as a buffer from which, despite the fluctuating supply of the mixture from the tank to be cleaned, the mixture can be passed into the separating tank at a constant speed, so that a Trouble-free operation of the separation tank is guaranteed. A constant inflow of the cleaned cleaning liquid to the spray nozzle arrangement in the container to be cleaned is then also ensured. In addition, the expansion tank has the advantage that in it a rough separation of the mixture into an upper oil layer and an oily-aqueous intermediate layer takes place and bottom sludge settles, so that in the separating tank only a fine separation of the oily-aqueous mixture into oil and Cleaning fluid needs to take place. Furthermore, the expansion tank offers the advantage, method and device for removal
oily deposits from the internal surfaces
of container walls by washing
the walls with a cleaning liquid

Patented for:

International Groom Company G. mb H.,
2000 Hamburg 11, Vorsetzen 39

Named as inventor: Klaus Brockmüller, 2161 Wedel Claimed priority: Great Britain March 27, 1962 (11 689) - -

that in it the cleaning process supporting chemicals can be mixed with the water. Finally, the expansion tank offers the possibility of degassing the mixture and heating it. It can also serve as a reservoir for the recovered oil. The pump that does the mixture withdraws from the container to be cleaned, does not need in their performance on the absorption capacity of the separation tank to be limited, since the expansion tank to absorb excess quantities' able.

The cleaning of the container and the separation of the mixture can be carried out in a closed circuit take place in that the cleaning liquid removed from the mixture of cleaning liquid and oily deposits is separated, is returned for the purpose of further tank cleaning.

The cleaning liquid advantageously contains water in which one or more freely soluble electrolytes are included to the specific gravity of the aqueous phase according to the required separation to adjust.

When it comes to cleaning ship tanks, the cleaning fluid advantageously contains Lake water. It can also consist entirely of seawater.

The constituents of the mixture are advantageously separated or stratified in the presence of one surfactant.

The method according to the invention is advantageously carried out with a device which is identified is by means of supplying a cleaning agent

MN a / umi

liquid to the location of the surfaces to be cleaned, In the heating unit 8 and the separating unit 9 to the Means for centrifuging the cleaning liquid surface, rising oil can through lines 16 against the surfaces, a reservoir to open and 17, valves 18 and 19 and a common would take the mixture of cleaning fluid and line 20 back into the expansion tank 1 oily deposits that are returned to the cleaning system, which acts as a reservoir for the incurred generation process, a separation container, which is used with recovered oil. Vent lines 21 the expansion tank is in connection and means and 22 allow the return for degassing the return of the cleaning fluid to recovered oil.

the location of the surfaces to be cleaned for the purpose of re-In the funnel-shaped bottom of the heating unit 8 brought slingshots against these surfaces, with the io and the separation unit 9 collecting sludge relative volumes of the expansion tank and the can be deducted through lines 23 and 24. Separation container are such that the flow Inside the tank to be cleaned 3 is a speed of the mixture of cleaning liquid centrifugal device 25 provided, the cleanliness and removed oily deposits in the supply liquid by a pump 26 via a lei separation tank kept essentially constant 15 are supplied to 27 and 29 from the separation unit 9 regardless of the flow velocity. A pressure gauge 31 is attached to the line 29 speed of the mixture in the expansion tank. and a thermometer 32 connected.

The separating container advantageously consists of a pump 26 output must be matched Cyclone separator which has two units, namely that the heating unit 8 and the separating unit 9 a separation unit and a heating unit. 20 should never be pumped empty. A vent line

In order to avoid unwanted solids in 33 and an overflow line 34, which in the equalizing den The equalizing tank and the separating tank are returned to the tank 1 on the feed line 27 long, means for removing coarse solids pump 26 are connected.

in the flow line between the tank, as shown in FIG. 2 it can be seen that the heating unit 8 is being washed and in front of the expansion tank End, which is separated from the essential parts in the separating container, and has to include inclusions, protrude,
The heating unit 8 and the separating unit 9 are also shown, which is also equipped as a reservoir for the heating coils. The heating steam is used by recovered oil. a line 35 and lines 36 and 37 in the EinEs can also be provided to units introduced and through with float valves oil, which separates in the upper part of the expansion tank 42 and 43 equipped discharge lines 40 and 41, and drain it into an oil reservoir to be discharged again.

lead into which the separated oil from the 35 If the device is put into operation, so Separation tank is passed. are first the separation container 8, 9 and the

To the tank rooms of tankers during the expansion tank 1 filled with sea water, which through To be able to clean empty travel, the device has a seawater tank 44 and a valve 45 in the advantageously installed on the ship. The compensation system is sucked in.

container can then be added chemicals to the seawater through a cargo tank or 40 should a coffer dam can be formed. to improve tank cleaning so

In the drawing, the subject matter of the invention is expediently placed in the expansion tank 1 for example and shown schematically. It shows through one to be provided in its upper part

Fig. 1 is a schematic representation of the opening introduced on board,
a ship usable device, 45 Is the filling of the separation container and the

F i g. 2 a schematic representation of the rub-in equalizing tank with seawater takes place, so that device according to FIG. 1, installed in a ship, valve 45 closed and the cycle begins. the

Fig. 3 is a schematic representation of a second from the separation container 9 through the pump 26 of the Embodiment of the device, centrifugal device 25 supplied cleaning nut

Fig. 4 shows the separating container according to Fig. 3. 50 fluid is pressed against the inner surfaces of the to be cleaned

In Fig. 1, an expansion tank 1 is thrown through one of the tanks 3, and that at the bottom of the Line 2 is connected to the tank 3 to be cleaned. Tanks accumulating mixture of cleaning fluid The mixture that collects at the bottom of the tank 3 and the removed oil deposits are removed by the from cleaning fluid and oily deposits pump 4 supplied to the expansion tank 1, in which the larger part of the mixture is sucked 55 out of the tank 3 by a pump 4 into an oil-containing one and conveyed through line 2 into the expansion tank upper layer 46 and an oily-aqueous intermediate layer. In the line 2 it is advantageous to separate between layer 47, with a finer deposit of leather Pump 4 and the tank 3 a stanchions (not shown) at the bottom of the expansion tank 1. Filter interposed, the coarser solids to The oily-watery layer is by means of the pump withholds. 60 13 withdrawn from the expansion tank and in

A separating container which pushes the heating unit 8 out of a heating unit 8. After heating, it is made up of a separating unit 9, is transferred by a line from this through the line 12 to the separating 10 with the lower part of the equalizing tank 9. The circuit is closed, container 1 is connected. A pump 13 in the line when the cleaning 10 occurring in the separating tank 9 draws the mixture via a suction foot 11 from the 65 liquid through the pump 26 of the discharge device-equalizing tank 1 and initially pushes it back into the device 25,
the heating unit 8, from which the heated mixture reaches the separating unit 9 via the line 12 if the cleaning process requires more water. that should, as is available in the cycle, so

1

it is possible to pump additional water into the expansion tank 1. Excess cleaning fluid can be withdrawn via line 48 after opening valve 49. Via line 48 the expansion tank and the separation tank can also be emptied into the sea.

In the embodiment according to FIG. 3, the mixture of cleaning liquid and oily deposits from the bottom of the tank 51 to be cleaned by the pump 52 via a line 78 and a Filter 53 is supplied to the expansion tank 50. The filter 53 can also be arranged in front of the pump 52 being. From the lower part of the expansion tank 50, the liquid is transferred via the line 70 into the Separating container 54 withdrawn. If the separation tank is higher than the expansion tank, it becomes a pump provided in line 70. This pump must not have any turbulence or emulsification if possible of the oil and water. A reservoir 55 is provided for the recovered oil, des- ao sen lower end connected to the upper end of the expansion tank 50 by a line 84, 85 is. The upper part of the separating container 54 is also connected to the supply line via a valve-controlled line 87 85 connected to the lower end of the reservoir 55.

The ejector device 57 in the tank 51 to be cleaned becomes the recovered cleaning liquid is supplied via a pump 58 which is connected to the separation container 54 via a line 61. An emptying line 64 is also connected to the line 61 via a valve 63. Because the pump 58 for the centrifuging of the cleaning liquid from the centrifugal device 57 against the inner wall des TanksSl must generate the required pressure, a further pump should be connected upstream here when the distance between the pump 58 and the separation tank 54 is large.

The lower part of the oil reservoir 55 is through a line 65 and a valve 66 with the suction side of the Pump 52 connected, while on the delivery side of this pump 52 still via a valve 67 an emptying line 68 is connected. The pressure side of the pump 52 is also connected via a valve 69 of the connecting line 70 between the expansion tank 50 and the separation tank 54. Bilge water can also be fed into this connecting line 70 via a valve 71.

A valve is used to connect the line 62, 74, 77 connecting the pump 58 to the centrifugal device 57 73 is connected to a container 72 through which chemicals are introduced into the cleaning water can, if these should not be entered in the expansion tank 50.

When the device is put into operation, seawater is first fed into the pump 58 via a valve 75 the system is sucked and via a valve-controlled branch line 76 from the pressure line of the pump 58 pressed into the line 78, which connects the pump 52 to the expansion tank 55. The lake water consequently passes through the filter 53 into the expansion tank 50. The expansion tank is about three quarters filled with sea water.

The nature of the oily deposits in the tank 51 being cleaned makes the use heated Seawater required, a heating coil is provided in the expansion tank 50, which the Warming of the lake water to around 90 ° C enables

267

light. If chemicals are to be added to the seawater, there are 50 in the compensation tank for this purpose Openings for the introduction of the same are provided. To obtain a thorough solution and / or dispersion of the To achieve chemicals in the seawater, the contents of the surge tank 50 are pumped 58 with the valves 59, 79, 76 and 80 open, through the separating tank 54 back into the expansion tank 50 pumped over.

At the beginning of the tank cleaning, the valve 76 in the branch line is closed and the cleaning liquid withdrawn from the separation container 54 and pumped to the centrifugal device 57. The on The mixture from the bottom of the tank 51 to be cleaned is fed into the expansion tank by the pump 52 promoted, and it begins with open valves 81, 82, 80, 59, 79 and 83 the cycle of Liquid through the expansion tank 50, the separation tank 54 and the tank 51 to be cleaned. The pump 52 expediently has an approximately 30 to 50% higher output than the pump 58.

In the expansion tank 50, the greater part of the mixture separates into an oil-containing upper part Layer and an aqueous intermediate layer. If the oil layer reaches the overflow 84 in the upper part of the Expansion tank 50, it flows into the oil reservoir 55. This also happens especially when the pump 52 suddenly delivers an increased amount of mixture into the expansion tank. In the expansion tank 50 rising gases are discharged via a vent line 86.

Liquid flows out of the expansion tank 50 into the separation tank 54 through the line 70, which is largely free of oil, deposits and gases.

The separating tank 54, like the equalizing tank 50, has heating coils in its upper part provided in order to keep the oil in a pumpable condition if necessary.

While the oil accumulating in the separating tank 54 is transferred to the reservoir via the automatic oil drain 87 55 flows in, the cleaning water freed from the oil is fed to the pump 58. Also the reservoir 55 can be provided with heating coils for heating the oil. The oil reservoir and the connection line from the separation container to the pump 58 are advantageous provided with vent lines 88 and 89.

Any water that collects on the bottom in the reservoir 55 can from time to time be pumped through the pump 52 withdrawn and pumped back into the expansion tank 50.

If the expansion tank 50 fails, for example because it has to be cleaned, that can Water from the oil reservoir 55 and / or the separating tank 54 and / or the overflow 84 of the compensation tank 50 accumulates, can be returned by means of the pump 52 through the separating container 54, from which the cleaning water, which has been freed from the oil, is pumped overboard when it is not needed can be. The cleaning water that is no longer required can also be used after the cleaning process has ended can be discharged from the separation container 54 through the line 64 overboard.

If the oil reservoir 55 is full, then, as described, water can be drawn off from its lower part and fed back into the expansion tank 50 by the pump 52. But is the expansion tank 50 is already full, the pump 58 is shut down.

Claims (13)

switches and water and / or oil is drawn off at the bottom of the oil reservoir by a pump and pumped into the expansion tank 50. From there the liquid is passed into the separating container 54, from which the cleaning liquid freed from the oil is drained overboard. If, however, the oil reservoir 55 is filled with anhydrous oil, the cleaning process is interrupted and the oil is drawn off by means of the pump 52 and filled into a further reservoir or into barrels. If oil is to be removed from bilge water, it is expediently pumped into the separating container 54 via the open valve 71 using a piston pump. The water freed from the oil is then pumped overboard through the discharge line 64 with the valve 63 open. If the expansion tank 50 is to be cleaned, then by means of the pump 58 with the valve 75 open, seawater is fed to a centrifugal device 57 which is introduced into the expansion tank and with the aid of which the expansion tank is cleaned. The mixture at the bottom of the expansion tank flows through the opened valve 80 and the line 70 into the separating tank 54, is freed of the oil therein and then drained overboard via the opened valve 63 and the discharge line as 64. The separation container 54 is a cyclone separator as shown in FIG. 4. It has an outer pre-separation chamber 90 and an inner separation chamber 91. Both chambers are equipped with heating coils 92 and 93, into which steam is introduced at 94 and 95 and exits at 96 and 97. The mixture withdrawn from the expansion tank is introduced via the inlet connection 98 and freed of deposits in the pre-separation chamber 90, with simultaneous heating by the heating coils 92. At 99, a ventilation pipe is connected. The heated mixture, which has been freed from deposits, flows from the pre-separation chamber 90 into the inner separation chamber 91, in which plates 107 are arranged. Drops of oil collect on the underside of these plates and finally rise up from the outer edge of the plates. From there, the oil is removed through an outlet opening 100. The separation container is advantageously controlled automatically. For this purpose, a socket is provided at 101, which enables the connection of an electronic control. The oil can also be drawn off by hand. Test taps 102 and 103 make it possible to determine the depth of the oil layer, so that the cleaning liquid freed from the oil leaves the inner separating chamber 91 through an outlet opening 104 and flows through the pump 58 as shown in FIG. 3 to. A thermal insulation 105 protects against heat losses, and a drain opening 106 enables the separation container to be completely emptied. Patent claims: 1. Method of removing oily deposits from the interior surfaces of container walls by washing the walls with a cleaning liquid, the mixture consisting of Cleaning fluid and oily deposits withdrawn from the container and placed in a separation container is separated again, characterized in that the mixture before its entry into the separation container (8, 9) by a a fluctuating flow rate into a substantially constant rate converting expansion tank (1) is passed, in which the greater part of the mixture separates into an oily upper layer (46) and an oily aqueous intermediate layer (47), with coarser deposits settle as bottom sludge, while the finer separation of the oily-aqueous mixture into oil and cleaning fluid takes place in the separation container (Fig. 1). 2. The method according to claim 1, characterized in that the cleaning liquid, the is separated from the mixture of cleaning liquid and removed oily deposits, is returned for the purpose of further tank cleaning. 3. The method according to claim 1 or 2, characterized in that the cleaning liquid Contains water, in which one or more freely soluble electrolytes are contained to the specific Adjust the weight of the aqueous phase according to the required separation. 4. The method according to claim 3, characterized in that the cleaning liquid is sea water contains. 5. The method according to any one of the preceding claims, characterized in that the Separation or layering occurs in the presence of a surfactant. 6. Device for performing the method according to one or more of the preceding Claims, characterized by means (26, 29) for supplying a cleaning liquid the location (3) of the surfaces to be cleaned, means (25) for centrifuging the cleaning liquid against the surfaces, an expansion tank (1) for receiving the mixture of cleaning fluid and removed oily deposits that occur during the cleaning process Separation tank (8, 9) which is connected to the expansion tank and means (27) for the return of the cleaning liquid to the location of the surfaces to be cleaned for the purpose of repeated Hurling against these surfaces, with the relative volumes of the expansion tank and the separation tank are such that the flow rate of the mixture of cleaning liquid and removed oily deposits in the separation tank can be kept substantially constant regardless of the Flow rate of the mixture in the expansion tank. 7. Device according to claim 6, characterized in that the separating container consists of one Cyclone separator exists. 8. Device according to claim 7, characterized in that the cyclone separator has two Has units, namely a separation unit (9) and a heating unit (8). 9. Device according to claim 6, 7 and 8, characterized in that means (53) for removing coarse solids in the flow line between the tank (51) being washed, and the expansion tank (50) are provided (Fig. 3). 10. Device according to claims 6 to 9, characterized in that means (16 to 20) for removing oil. that in the separation tank (8, 9) is separated, and are provided for introducing this oil into the expansion tank (1), which also serves as a reservoir for the recovered oil (Fig. 1). 11. Device according to claims 6 to 9, characterized in that means (84, 85) are provided are to remove oil that separates in the upper part of the expansion tank (50) and to conduct it into an oil reservoir (55) into which the separated oil from the separation container is also fed (54) is directed (Fig. 3). 12. Device according to claims 6 to 11, characterized in that it is on a ship installed. 13. Device according to claim 12, characterized in that the expansion tank through a cargo tank or a koiferdanun is formed. Considered publications:
Belgian Patent No. 564959;
British Patent No. 350850. 1 sheet of drawings 109 539/48 *. U O Bundeidruckerel Berlin 809 636/2233