DE1920214A1 - Process for cleaning the inner walls of a container system and device for carrying out the process - Google Patents

Description

Dld / with HGM Kanegafuoui Boseki Kabushiki Kaisha , To kyo (Ja pan)

Method of cleaning the inner walls of a Container system and device for carrying out the process

The invention relates to a method for cleaning the inner walls of a container system with a vertical container and a member for conveying a liquid from the container and a device for carrying out the method .

Container systems, welohe a vertical container, eim. · Feed pump for a j; iuid so \ tfie pipes and Connecting organs are included in many cases for the Preparation, mixing, execution of chemical reactions, storage and delivery of solutions, emulsions or suspensions used by various chemicals.

ä If such a container system is used one after the other for ^

If different liquids are to be used, the previously treated liquid must be completely removed from the inner walls of the system before the new liquid to be treated is introduced. This removal of the previous ^r M.ünsigkeit is necessary to inadvertent mixing of the two liquids. impede. Normally, such removal of the previous liquid is i by the A: EADERSHIP a Reinigungsf LUssigkeit, usually of Wassor carried out in the BebäLteranlage be cleaned whereby the inner surfaces of the plant. Although one of the-

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like cleaning process is common, are so far no effort has been made to carry out the operation in a more economical manner. If e.g. a foaming liquid such as a surfactant has been treated in the facility, so it is difficult to completely remove the residues within a short time without doing a. strong foam is formed. Even so, it is clear that good and quick cleaning is essential when performing all of the operations mentioned is important if this is to take place without interference. Automatic taxation - 'r'terae have also been developed recently, through which various industrial processes are controlled in a programmed manner. In such a case miisp the programmed cleaning process exactly within the scope of the Program can be executed.

The invention aims to provide a method and apparatus by which to complete Layers of liquids which adhere to the inner walls of such a container can be removed, cleaning should take place in the shortest possible time with the smallest amount of cleaning liquid.

The method according to the invention, by means of which this aim is achieved, is characterized in that a plurality of flows of a cleaning liquid is guided against a circumferential surface of an inner wall of the container at a point which is not lower than the upper edge of the Wall area to be cleaned, whereby the angle of the currents with respect to the W _n nd is less than 60 lot, and that the distance P in millimeters between a pair of adjacent currents through the formol. P = * vi___ is determined if O is the temporal flow rate of a dVr flows in liters per minute that the cleaning

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liquid ano your container forcibly with a volume velocity is removed, which corresponds to the supply of cleaning liquid that the cleaning liquid dumb the conveyor "is moving and that at the same time fresh cleaning fluid is introduced from a source into at least one sealing element of the conveying element, in such a way that that from it it gets into the conveying organ.

The device according to the invention is characterized by at least one spray tube, which is arranged in the container at a point that is higher than the upper edge of the Y / and area of the container to be cleaned, faces the entire area of the V / nnd and at least one ring line forms, v / o at aar? Spray tube is provided with a plurality of nozzles, which are designed in at least one row in the spray tube , facing the inner surface of the wall of the container and facing this at an angle of less than 60 °, with -be Adjacent nozzles have a distance ρ given by the formula ρ = "" TwyTT

is determined, where '■ * <. is a total volume velocity of the liquid, v; <\ lfh '· flows through a dune opening, expressed in liters per)'"inute:,dar'- i.-iii ''p" i. Bottom of the! container a j ■ delivery pump i 'for the ^ lufnsi ^ u ^ it is connected, whose A

temporal ördormenge '■' is not smaller than the amount rate of Zuf'uiir the cleaning liquid in the container <\ 'i ^r ~ V: is provided al · Pn-nne with rrinem cleaning member, the cleaning soft a seal in the space between f.ln'iT (iroh't.arerj WoM ^ and a housing serves the pump, wo- uu \. dfii-i JifvLni; - ';un;'; i: or, '; nn an organ for the supply of the ? ^Reiniguni> - ''".J-üf5iii" ¹ kfd.t of a 'iuelle dor -'lüssiglrf 11 hat seal ^{oriLrj: lt;} and then at least one ReinigungsoTvrn for a''öT'icT} _ (>: . tion of the pump is provided, wolohi.; - Ίρτ RexTii ;; uni; dor Dichtunren von s! view dor rorderleitunr, serves, v / oboi represents: jiniriiguriri'c '.'v'in oln organ for you ο supply <urr i? rini ;; uri-; i --—

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liquid from eir; -.τ contains cuelle on poetry.

Further details of the invention emerge from the following description of some exemplary embodiments based on the accompanying drawing. Ss show:

Fig. 1 is a side view with partial section of an embodiment of the device according to the invention in a container system with a vertical container.

Pig. 2 is a sketch for explaining the principle of arenas device according to the invention,

V ¹ ig. 3 is a graph showing the relationship between the pressure of cleaning water sprayed against an inner wall of the vertical container, the width of a flow of the liquid formed on the surface of the wall by a jet of the liquid, and the angle between the jet of the Cleaning fluid and the inner surface,

^v 'ir · ;. 4 a diagram of the relationship between the rate of flow of the cleaning liquid through a nozzle, the width of the flow of the liquid on the wall and the distance between: the end of the nozzle and the Wnnd,

Fig. 5A is a plan view of an embodiment; part of the device in the case of a vertical container,

FIG. 5B is a side view with partial section of the device from FIG.

Figures 6 to 9 partial views with partial sections of others Versions of the device for a vertical container,

10 shows a partial section of a nozzle of the device,

11 is a front view with partial section of an embodiment

the inventive device with a feed pump for the liquid.

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Pig, 12 a section along the line A-A in Pig, 11, 13 is a view with partial section of an embodiment of the Invention "in a connecting flange of a pipeline and

Pig. 14 a view with a partial section of another version the device is called a connecting flange of a pipeline.

According to the representation in the Pig. 1, a vertical container 1 is provided with a spray tube 4 for a cleaning liquid and an outlet opening 5 . The spray tube 4 is located on the upper edge of the container 1 and is used to spray a cleaning liquid 3, for example water, which is sprayed from the tube 4 against an inner wall surface 3 of the container 1. The liquid "located in the container 1" is removed through the container 1 through the opening 5 and a line 7 by means of a feed pump 6. The spray tube 4 is provided with a plurality of nozzles 8 which are directed towards the V / end face .2. In order to achieve the best results when cleaning the wall surface 2 by the cleaning liquid 3, the following three conditions must be observed.

First, the liquid 3 sprayed against the wall surface 2 must not bounce back from the wall after touching the V / and. No liquid flowing along the V / and does not participate in the cleaning of the wall surface 2,

Second, the wall surface to be cleaned must be completely covered by a cohesive layer of the cleaning fluid which flows downward along the wall surface 2. Every point on the wall surface over which the liquid 3 does not flow remains uncleaned, so the "" I in "; incomplete and un ^ uroichcinde cleaning effect results.

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Thirdly, the liquid 3 which flows to the bottom of the container 1 must be removed therefrom immediately without stopping there. If the liquid remains at the bottom of the container 1, it can spread over its surface. Large amounts of, for example, foam "form, which are difficult to remove through the opening 5.

The following explains how these three conditions are met by the invention. First, the arrangement for fulfilling the first condition is shown using the! '' Ig. explained. It is assumed that 1 is the distance between the nozzles 8 and the wall 2 of the container, 2Ρί the inner diameter of the spray tube 2, 2r the inner diameter of the openings of the nozzles 8, 4j the angle between the wall 2 and the direction of the nozzle , Q is the flow rate of the cleaning liquid exiting through a single nozzle in liters per minute, W is the average width of a flow layer of bulkiness that is formed at the W ^f md, measured in millimeters and Pr the pressure of the cleaning liquid, in millimeters ι Ig of the liquid in the spray tube 4. In the implementation of the device, niob 1 moves in the range of 5 to 10 mm, 2R from 10 to 40 mm, 2r from 2 to 10 mm and 0 <, from -i0 bit; cJO. W.'uiser is used to clean the wall '.' Viche 2 de η Bonältoro 1. The relationship between o0 , Pr and W int obtained through experiments in the diagram in the -.- 'xy. :> darrest el Lt. As can be seen from FIG. 3 , the value of W increases with the increase in the value of Pr and with a decrease in the hawser the angle Lr * C. Aunnordem has shown itself-, then, when the value of 1 -'arufficiently smaller int a In the value of 2R, the greens of L ¹ R and .'r i'aut have no influence on the value of W.

In Colgendon there is a relationship? between W and vi / more detailed bunuhrieben. The value of W shows only a slight change if the angle oC is less than μ Is 4 ^l >, but does not increase suddenly if the value of oL 60 exceeds

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increases, for example, when the angle reaches 85. This is caused by the fact that the proportion of the Wandi ^"I:. U; he -abprallenden liquid is large when the size of the angle ^ L exceeds 60 ° Accordingly, reduces the Men.- · ρ <1, it Keinigungsflüssigkeit which along the wall surface β tr üint.

Eo follows from these explanations that the angle «^ must be less than 60. Even in cases where the wall surface is not vertical but inclined, the angle oC must be less than 60 '.

The end explains how the second condition can be met. If the individual r'lüssigkeitsströme, ^di'-: auc the individual nozzle exit, form independent currents which surface along the wall niedren 2 downward, ro it is necessary that the adjacent flows together at a point formed in this way vorl ¹ j κι en, which is not lower than the upper Ran'i of the wall surface to be cleaned. The currents must therefore "form a single layer of current, which covers the whole of the r '". Lni - pn'ie W-'nd! "Pool without interruption, so that a complete cleaning of the wall surface can be achieved.

in the ^! -'ig. 4 is a 7 receipt obtained by posting? Kv / isctr ^ n the sizes Q, W and L shown. It shows r.l'ih thereby :; · the size of W remains essentially constant, · Ίυ;: ί ·] v. ^! '' nn the values of 1 in the range of 17 to From mm verUndern and that the Big W with the enlargement of the word or- ·: · The 'ver ^/: Rossert It liat si ". h shown that the following relationship exists between '. and W:

Q ^ 0.0IbW. (l)

In order to connect the "neighboring flows of the liquid to (irzielon, the distance P dor on the Vfnnd running ■ Lüsnigiioii v.vtrömo with dor Grb'sse \ i in Γο 1 gomdrn ratio

'' If -nn rn'in μririjtmti 1, nuv.r der Viort von I ιό gtuvHh 1 tv / uj-'K ;, -laf.c?

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if it is sufficiently smaller than the value of 2R, the result is a distance ρ between adjacent nozzles which is necessary for the distance P has the following ratio:

If the relationships given by the formulas (2) and ("5) are substituted into the formula (1), -go results in the following relationship:

^{p =} ΟΤΟΪ6

From the relationship according to the formula (4) it follows that the Distance ρ between the nozzles as a function of the flow rate Q of the cleaning fluid can be determined.

P The entire second condition can thus be fulfilled in that the nozzles 8 on the spray tube 4 are given a distance ρ which is calculated on the basis of the fourth of the mass flow of the cleaning liquid Li using the above formula (4).

Finally, it should be explained how the third condition can be met.

It should be safe in connection with the "1 assumed that · the total amount of flow of the liquid in the ^i;., Has inserted e- · holder 1 through the nozzles 8 the value of i-'R and the amount of flow of from the container 1 through the

_k orifice 5 derived liquid has the value wd. The following relationship must then be fulfilled so that no liquid remains in the container:

Qs = (d (b)

Assuming that the delivery rate of the feed pump is 6 ίο, the following relationship must be met:

Cc = Ud (6)

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If the formula (5) is introduced into the formula (6), the following relationship results:

Qc = Qs (7)

The third condition is thus fully met if the The delivery rate of the pump 6 is not less than the flow rate the liquid that is introduced into the container 1. In Figures 5A to 10 are some embodiments of the inventive device shown in container systems with vertical containers.

In the embodiment according to FIGS. 5A and 5B, the cleaning liquid is supplied to a spray tube 13 from a main line Ll is supplied through connecting lines 12 which connect the main line 11 to the spray tube 13 in the radial direction. The spray tube L3 is ring-shaped in the upper opening of the container 1 and contains a plurality of nozzles 14, which the inner wall surface 2 of the container 1 are facing. The nozzles 14 are formed on the spray tube 13 in a line at given equal intervals and serve the formation of jets of liquid that hit the wall surface 2 are gerioMet.

Another version of the device int in the l'ig. G shown, in which the main line 11. with a Pair of spray tubes 13a and 13b arranged one above the other connected, with the B'lünBigkelt at the same time through to the Tubes 1.3a and 1.3b arranged nozzles 14 is sprayed.

In such an arrangement the effective horizontal Removal of adjacent nozzles 14, which alternate in the tubes 13a and 13b are arranged, shown in the drawing. The distance ρ is the distance from neighboring Nozzles that are in such a relationship that the liquid emerging from the dunes is adjacent Currents on the wall forms shallow.

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In the embodiment according to FIG. 7, the main line 11 ″ is connected to a screw-shaped spray tube 15. The distance ρ is also shown in the drawing
shown and defined in the manner mentioned. Dos -screw-shaped spray tube 15 is coaxial with the container 1.

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In the embodiment according to FIG. 8, the main line 11 is connected to a spray tube 16 with a special cross section. The cross section of the spray tube 16 includes a pair of parallel sides and a pair of arcs which define the parallel Connect sides. One of the parallel sides, the side 19, faces the wall surface 2 and runs parallel to it. the Side 19 is provided with a plurality of nozzles 14 which are arranged in side 19 in two rows. The distance ρ is in of the figure and is defined in the manner already mentioned.

In the embodiment according to FIG. 9, there is a spray tube 17

formed with the same shape of cross section as the a

Spray tube 16 of the previous embodiment. However, since the wall surface 2 of the container 1 is inclined as shown in the figure, the side 20 is provided with the same inclination as the wall surface 2. The spray tube 17 is provided with a plurality of nozzles 14 which are arranged in three rows. The distance ρ is indicated in the drawing in the same way as before. The geometric arrangement of the nozzles 14 on the spray tube 17 is not limited to two or three rows. The distance ρ is given by the actual horizontal spacing of a pair of vertical lines which pass through a pair of adjacent nozzles, even nozzles that may be in different spray tubes. λ

As far as the shape of the nozzles is concerned, this is the case Relationship no particular restriction. A nozzle can either be formed by an opening in the VJand of the spray tube, or a protruding nozzle body 18 can be attached in the spray tube as shown in FIG. Of the The mentioned angle of the liquid jet can be adjusted by a corresponding choice of the shape and the inner diameter of the nozzle will.

In the system according to the invention, the cleaning liquid, which reaches the bottom of the container 1, forcibly from the container 1 through the pipe 7 with the aid of the feed pump 6 funded. During this promotion will also be carried out at the same time

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the inner walls of the pump and the pipe by the flowing cleaning liquid cleaned.

The rotatable shaft of the pump is connected to an external drive source connected, whereby the point at which the shaft is led out of the pump to the outside, with suitable sealing ' is provided. In addition, the connection points of the The pump with the delivery line or with the tank is generally sealed at the connecting flanges by seals. It it is known that there are difficulties when the liquid is to be removed, which in the seals on such Has penetrated. If, for example, a colored liquid was first treated in the system and then another liquid

Pness is treated in the system, it has often been shown that that the second liquid is contaminated by the first, namely by the liquid which got into the seals of the connection points has penetrated.

In Figures 11 and 12 is an embodiment of the invention Device shown, which is used to clean the seal of the feed pump. When executing according to the Figures 11 and 12, a housing 21 of the pump is provided with an opening 22 which is used to receive a shaft 2 3 of the pump. the Shaft 2 3 extends through opening 2 2 and is connected to a rotor 24. There is a projection 25 around the opening 22 formed on a side wall 27 of the housing 21, on which

W an internally threaded cap 26 is screwed on. One end of the cap 2G is provided with an opening for the shaft 2 3 to pass through. A seal 28, an annular body 29 and a further seal 30 are arranged within the cap 26 as shown in the drawing. The seal 28 touches the side wall of the housing 21 and serves to seal the space between the shaft 23 and the opening 22 of the housing 21. The seal 30 is arranged at the other end of the cap 26 and serves to seal the space between the shaft 23 and the opening of the cap 26. The annular body 29 is provided with an inner cavity which forms a first annular chamber 31 through which the shaft 23

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is carried out. The annular body 29 is also with a plurality of openings 35 which are formed in its outer wall. The cap 26 is also with a provided inner cavity, which a second annular chamber 33 on the outer circumference of the annular body 29 corresponding the representation in the drawing. In the outer wall of the cap 26 an opening is formed which connects to a line connected.

In the following, the cleaning of the seals of the system is explained with reference to the described embodiment.

The water supplied through the line 34 passes through the second annular chamber 33 and the openings 35 into the first annular chamber 31. The water then penetrates into the gap between the shaft 2 3 and the seal 28 and through the Gap in the interior of the pump 6. During this flow, the water removes all residues of the previously treated liquids from the poetry. Although when the pump rotates a small amount of the contaminated liquid enters the first annular Chamber 31 passes through the seal 28, this liquid can be carried through the cleaning water already in the first ring-shaped Chamber 31 can be diluted. There is therefore no further contamination of the seal 30. When the pump is in operation If a small amount of water is continuously supplied, the seal 28 can be kept continuously in a clean state.

It has also proven extremely difficult to completely clean the seals that are between Flanges are located, which are arranged in the pipeline for the promotion of the liquid to be treated. In this context Figures 13 and 14 show embodiments of a device for cleaning the seals of the flange connections mentioned.

As shown in FIG. 13, tubes 41 and 42 are provided with a pair of interacting flanges 43 and 44 which are connected to one another by bolts 46 and nuts 47. Between the flanges 4 3 and 44 is located a seal 45. The surface of the flange 4 3 facing the flange 44 is provided with an annular groove 48 which the

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Surrounds the pipe. The annular groove 48 forms an annular one Chamber between the facing flanges 43 and 44. This annular chamber 48 is connected to the inner cavity of the pipeline, since between the inner edges of the .flange and the tubes 41 and 42 have a gap, as shown in the drawing. On one side is the annular chamber 48 is provided with an opening 49 to which a pipe 50 is connected.

In this embodiment, the cleaning water is introduced through the conduit 50 into the annular chamber 48 and penetrates through the gap into the inner cavity of the pipeline. In this way _k the gap can be cleaned well by the cleaning water.

The contaminated water entering chamber 48 can be diluted by the water in chamber 48 and does not cause any further contamination of the seal 45. If a small amount of water is continuously introduced into the annular chamber 48, so a contamination of the chamber 48 can be prevented at all.

In FIG. 14, one is modified compared to FIG. 13 Execution shown. In this embodiment, not only the flange 43 but also the flange 44 is annular Provided groove, namely with a groove 51 which corresponds to the groove 48 of the flange 3 3. Between the grooves 48 and 51 is a seal 45 is arranged with a plurality of openings 52 which serve to connect the two grooves 48 and 51. the Seal 45 serves to seal the space between the flanges 43 and 44 and the tubes 41 and 42.

The cleaning water supplied through the line 50 enters the groove 51 through the groove 48 and the openings 52, such as this is indicated in the drawing by an arrow. The seal 45 is replaced by what is in the grooves 48 and 51 Water purified.

By using the inventive method and the device can operate the system effectively in an extremely short time using a minimal amount of the cleaning fluid be cleaned when chemical liquids of different kinds are to be treated in a given order «. the

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Application of the invention is particularly in the case of automatically acting chemical plants advantageous.

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Claims (7)

19202H A_n_s_ £ _r_ü_c_h_e I IJ Process for cleaning the inner walls of a container system with a vertical container and an organ for conveying a liquid from the container, characterized in that ■ a plurality of flows of a cleaning liquid against a Circumferential surface of an inner wall of the container guided at one point which is not lower than the upper edge of the wall area to be cleaned, the angle of the currents relative to the wall being less than 60, and the distance P in millimeters between a pair of neighboring flows is determined by the formula P = -τ- ^ r--, if Q is the amount of flow over time U 3 U J D one of the flows in liters per minute is that of the cleaning fluid is forcibly removed from the container at a rate that the cleaning liquid through the Conveyor element is moved and that at the same time fresh cleaning liquid from a source in at least one sealing element of the Funding organ is introduced in such a way that it arrives therefrom in the conveyor organ. 2. Device for carrying out the method according to claim 1, characterized by at least one spray tube (13,15,16, 17), which is arranged in the container (1) at a point that is higher than the upper edge of the wall area to be cleaned (2) of the The container is facing the entire circumference of the wall and forms at least one ring line, the spray tube 'with a A plurality of nozzles (8) is provided, which are formed in at least one row in the spray tube, the inner surface of the wall (2) of the Container (1) are facing and are directed towards this at an angle (° <) of less than 60, with between adjacent Nozzles there is a distance ρ, which is determined by the formula ρ -, where Q is a rate of flow of the. Liquid that flows through a nozzle opening, expressed in liters per minute, is that with the bottom of the container a feed pump (6) for the liquid in connection, the temporal delivery rate is not less than the rate Q of the - 16 - 009837/0087 Feeding the cleaning liquid into the container so that the pump (6) is provided with a cleaning element (31, 3U) which is used to clean a seal (29) in the space between a rotatable shaft (23) and a housing (21) of the pump , wherein the cleaning element contains an element for the supply of the cleaning liquid from a source of the liquid to the seal, and that at least one cleaning element is provided for a delivery line of the pump, which is responsible for cleaning the seals (4-5) of flanges (43, H ¹ +) serves the conveying line, the cleaning element (48,51) containing an element (50) for the supply of the cleaning liquid from a source of the seal · ' 3. Device according to claim 2, characterized in that that the organ for cleaning the feed pump (6) contains an annular body (29) and a cap (26), the annular Body (29) encloses the shaft (23) of the pump (6), the ring-shaped one Body has an inner cavity which is formed by an annular hat (31), and the annular body (29) is provided with at least one opening (35), which the annular Hat (31) with the outer surface of the annular body (29) connects, and that the cap (26) is provided with an annular groove (33) formed in its inner surface, a outer circumferential surface of the cap with at least one line (34) is provided for the cleaning fluid, which is attached to the annular Groove (33) of the cap (26) is connected, one end of the cap with an opening for the passage of the shaft (23) is provided, and the cap (26) the annular body (29) and a pair of seals (28,30) encloses which between the annular body (29) and the groove in the cap (26) are arranged and delimit a second annular space which the ring-shaped body (29) encloses. 4. Apparatus according to claim 3, characterized in that that the cleaning element for the delivery line (41,42) contains at least one annular groove (48,51) in one of the facing Faces of a pair of flanges (43,44) is formed and the interconnected tubes (41,42) encloses, wherein at least a line (50) for the cleaning liquid to the annular 0 0 9 3 8 ^'7/7 8 7 OG 19202H Groove (48,51) is connected, and the annular groove is a chamber forms, which surrounds the tubes (41,42) » 5. Apparatus according to claim 2, characterized in that that the spray tube (15) is helical, wherein its axis of the helical line coincides with the vertical axis of the container (1) (Fig, 7). 6. Apparatus according to claim 2, characterized in that that the spray tube (13,13a, 13b, 16,17) is at least partially ring-shaped is formed, wherein its axis of the ring shape coincides with the vertical axis of the container (1). 7. Apparatus according to claim 4-, characterized by ^ that the cleaning member has two annular grooves (48,51) formed in both facing surfaces of the pair of flanges (43,44) are formed. - 18 - 009837/0087 Blank page