CH618806A5 - Method and apparatus for the exchange of and removal of waste from suspended matter filter elements - Google Patents

Description

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PATENT CLAIMS, cylindrical, free ring spaces between them

1. A method for exchanging and disposing of filter layers (26, 27, 28) has that the ends of each filter in a housing which is sealed in a suspended matter layer in the two end faces of the filter elements forming elements for nuclear facilities, which will reduce the effort (30 to 34) U-shaped cross-section, for example the filter element needed to be accommodated by potting on a housing opening 5, that in the free annular space-attachable protective bag or hose from the men of the adjacent filter layers (26, 27 and 27, 28th ) the ring housing is pulled out and enclosed in this by welding off the protective cone-shaped conical means or hose made of easily compressible material, and wherein separating plates (35, 36) are arranged, and that the middle fil after removal of the used filter element a fresh layer (26) on its filter element lying downward in the direction of flow by means of a second one on the Housing opening to the end is closed by a base (29).

attachable protective bag or hose in the housing 7. Device according to claim 5, characterized in

inserted and sealingly connected to it, and that the ring-shaped filter layers (17, 18, 19) are conical in such a way that the used ones run in the protective bag or hose so that they have a V-shaped, closed filter element between them after reduction of its The volume is closed on one side by touching the filter layers, enclosed under pressure in a waste container, 15 alternating oppositely directed ring-like intermediate layers, characterized in that layers form as suspended matter filter spaces and that the contacting ends of the filter elements use filter cartridges of cylindrical shape and the free end of the outer filter layer into which a used filter cartridge is accommodated from its housing opening, which forms the end faces of the filter cartridge and serves to accommodate the filter cartridge according to moderate cross-section, for example by potting directly on the filter place of installation in a cross-section menu.

the waste container corresponding to the cartridge is lowered and 8. The device according to claim 5, characterized in that

it is compressed in the axial direction in such a way that on the circumference of the filter cartridge (37, 41) a ring-shaped, consecutive further used filter cartridge is lowered and compressed, for example in parallel axes, in the closed, zigzag-folded filter paper waste container Sheets or the, and that this waste container is arranged after filling with several 25 serpentine filter layers (42, 38), compressed filter cartridges for the final and that the outward-facing ring flange (24)

Transport is closed. end face facing the dust air side and is open,

2. The method according to claim 1, characterized in that the clean air side facing end face, preferably that the filter cartridges in the housing with their axes are closed by a removable bottom (39, 45).

right standing pressed up and received at the 9. 9. Device according to claim 5, characterized, exchange along these axes from the housing down that the clean air side facing the face of the Filterpa are lowered. trone (43) is open that one in the clean air end of the filter

3. The method according to claim 1, characterized in that the cartridge (43) insertable, dust-air side open, clean air-that in wall-mounted systems in a horizontal position upstream through a bottom (47) pre-filter cartridge (46) taken filter cartridges after pulling them out 35 is provided, and that the bottom (47) of the pre-filter cartridge in the wall of the receiving openings (46) forms an outwardly projecting ring flange (48), with axes standing vertically in each case below the receptacles by means of clamping elements (50) the waste container standing on the clean air side opening. surface of the filter cartridge (43) can be brought into sealing engagement

4. The device for performing the method is.

Claims 1 and 2, consisting of a dust air chamber 40 10. A device according to claims 5 to 9, characterized in that and a separate clean air chamber comprising air guide that the sealing system of the ring flange channel and one or more of the sealing Aufsches (24) the filter cartridge serving transverse wall of the filter cartridge serving with the air duct connection housing as a flange (58) of a connection housing connected to the dust air duct, characterized in that the air guide housing (53, 54, 66, 67) is connected to the filter cartridges (11,25,37,41,43,46,92) is formed in the 45 connecting piece (71).

Junction boxes with their axes are arranged vertically, that the junction box for each filter cartridge with a fastening of a protective bag or

hose (16) serving flange (15), lying in a horizontal plane, for exchanging the filter pack

The invention relates to a method and a device for exchanging and removing waste in a maintenance table (12) which can be raised and lowered and which seals a housing as a waste container before the use and removal of a filter cartridge Suspended suspended matter filter - a filter cartridge for dementia for nuclear facilities.

Upsetting device (82) connectable barrel (13) are provided. 55 In today's nuclear facilities

5. The device according to claim 4, characterized in that during operation considerable amounts of air from that the filter cartridge at least one axially directed ringför- radioactive admixtures and other harmful, from zigzag folded filter paper, existing suspended matter are cleaned to remove the atmosphere from the air to be cleaned in the transverse direction to keep these harmful substances free. This is done in the filter layer (19, 28), which contains the filter cartridge between the two end faces, the filter cartridge equipped with suspended matter filter elements, and that are, for example, in which the harmful suspended matter repels the dust air side Front, one to be separated outwards. A particular problem here is presented by the above transverse wall (9), which has a seal (44) and is contaminated with a necessary exchange of filter elements and its corresponding opening (10), without there being a risk of contamination for the system with the connection housing (6) bringable ring flange (24) it exchange staff and possessed for the environment. stands.

6. The device according to claim 5, characterized in that the previously used suspended matter filter elements for the filter cartridge (25) lie concentrically to one another. Such purposes generally consist of a zig-zag

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Zag folding of suitable paper-formed particle filter layer, which is accommodated in a rectangular or square rigid frame by means of sealing compound sealing. This filter element is inserted into a housing arranged in the ventilation duct, in which it is held with its peripheral edge by pressing elements in sealing contact on a sealing surface arranged in the housing, so that the air to be cleaned must inevitably pass the filter layer. The filter element is inserted from the side through an opening in the ventilation duct, which can be closed airtight by a door or a cover. The exchange of the contaminated filter elements takes place using the so-called protective bag technology. A so-called rim ring is arranged around the lateral opening of the channel wall which serves to introduce the filter element, on which a protective bag made of plastic is fastened. After the lid or the door is opened and after the tensioning elements are released over the protective bag, the filter element is drawn into the protective bag, the protective bag being welded on its free end, so that the contaminated filter element is sealed airtight in the bag; at the same time, the door opening is closed by the remainder of the protective bag on the rim, which is also welded off. When a new filter element is inserted, a new protective bag containing the filter element is applied to the rim, the welded-off bag residue from the previous filter element being overlapped and pulled into the new bag. The new filter element is now inserted into the housing through the door opening and the pressing device in turn is actuated via the protective bag, whereupon the door is closed by overlapping the rim ring and the bag located on it. When this contaminated filter element is removed, after opening the door and after releasing the pressing device, the filter element is drawn into the protective bag, which, as described above, is then separated and simultaneously welded away. In so-called wall installation systems, the suspended matter filter elements are accommodated in rows of installation frames that lie side by side and one above the other. According to the applicant's proposal according to the invention, the exchange of contaminated filter elements takes place by means of a protective tube, the end of one side of which is attached to the rim ring surrounding the receiving opening of the filter element, the tube being attached in the region of its center to the circumference of the frame of the filter element, while the other free end is slipped back over the frame of the filter element so that the air to be cleaned can pass through the filter element. When the filter element is replaced, the free end of the protective hose that is pulled back is pulled over the filter element and welded, whereupon the filter element is pulled out of the opening in the frame after the tensioning device has been released and the protective hose between the filter element and the frame opening is separated and welded off, so that the filter element is also is accommodated in a protective bag that is closed on both sides and the frame opening of the housing is closed by the remaining hose on the rim. The use of the protective hose and the protective bag is intended to protect the operating personnel and also the surroundings from contamination by suspended substances which are harmful to health. The filter elements enclosed in the protective bag or protective hose must be disposed of for waste disposal. For this purpose, special barrels or containers are available, in which the contaminated filter elements are received and which, in the closed state, are placed in a protected place until the activity has subsided. Afterwards, these volumes are reduced and then disposed of. The state of the art described above results from the following publications: DT-AS 2 215 194, DT-PS 686 003, DT-PS 536 397, DBGM 7 105 522, DBGM 7 217 374, DBGM 7 113 113 and DBGM 7 099 463 .

5 This known method of replacement and waste disposal has considerable disadvantages in several ways.

Since the rectangular or square filter elements are always replaced from the side, i.e. in a horizontal plane, a considerable amount of space is required in addition to the actual filter system, since a maintenance table must be available before the opening of the housing can be removed, on which the required handling of the filter element, for example welding into the protective bag or separation and the like, must be carried out. Another disadvantage is that the housing used to hold the filter element also requires considerable effort due to the fact that the associated devices for use are used to properly seal the rectangular or square filter element in the housing considerable pressures are required for sealing, so that the housing must have appropriate stability. A further decisive disadvantage is that the relatively thin protective bags or protective tubes made of plastic can easily tear through the angular corners of the frame of the known filter element in the event of careless or unprofessional handling, which poses a considerable risk, at least for the operating personnel. Another major disadvantage arises in the removal of the contaminated filter elements, 3o d. H. when they are taken into the waste barrels. Since the filter elements do not fit into the round waste barrels due to their angular shape, they have previously had to be reduced in size and volume by pressing so that they can be taken up in the waste barrels.

35 Since such a reduction in volume can only be achieved by breaking the rigid frame of the filter element, the protective bag must inevitably tear. For this reason, it was previously necessary to store the filter elements enclosed in the protective bags until the activity ceased and there was no longer a risk of contamination. Only after this storage period had elapsed was it possible to reduce the volume of the known filter elements by pressing so that they could be taken up in the round waste containers. The space required for the deposit 45, which must be equipped with special protective measures, is space-consuming and inevitably entails an increase in the risk of contamination. Finally, it should also be noted that the devices required for comminution or compression of the angular filter elements also require a certain amount of effort.

In contrast, the invention has for its object to provide a method and an apparatus which, with optimally small space requirements and with optimally low expenditure required, simple and safe replacement of the filter elements and their simple, safe and fast waste disposal in the shortest possible way at the filter location guaranteed without the risk of contamination of the operating personnel and the environment during the handling of the contaminated 60 filter elements.

This object is achieved by the method according to the invention, which is characterized in that filter cartridges of cylindrical shape are used as the suspended matter filter elements, that a used filter cartridge from its housing opening, which is used to hold the filter cartridge, directly down at the filter insert location into a cross section of the cartridge The waste container is lowered and compressed in the axial direction,

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that in succession further used filter cartridges are lowered into the waste container and compressed, and that the waste container is closed after filling with several compressed filter cartridges for final removal.

An optional feature of the method is that the filter cartridges are accommodated in the housing with their axes standing vertically and, when exchanged, are lowered out of the housing along these axes.

A further variant of the method consists in that, in the case of filter cartridges accommodated in a horizontal position in wall installation systems, these are transferred with their axes standing vertically into the waste container below the receiving opening after being pulled out of their receiving openings arranged in the wall.

The filter cartridge of cylindrical design, which has not previously been used for nuclear facilities and its design-related easy compressibility, enables the contaminated filter cartridge to be removed quickly and easily by lowering it vertically into a corresponding waste container without the risk of damage of the protective bag. The transfer of the contaminated filter cartridges takes place, as far as possible, in the vertical direction, i. H. below the filter housing, so that there is no increased space requirement. The protective bag cannot be damaged because the filter element has no sharp corners. It is also not necessary to deposit the filter cartridge so that the activity subsides, since the filter cartridge in the radiation-protected waste container can immediately be compressed as garbage that can be disposed of, without considerable expenditure being required, and without the risk that the protective bag will be present during the compression process torn. Due to the squeezing device clamped on the waste container, the contaminated filter cartridge, which is located in the waste container, can be compressed immediately at the location of the filter insert and the maintenance point, whereby further contaminated filter cartridges can be taken up and compressed in the waste container until they are completely free is filled so that it can be closed. Where the filter cartridges are accommodated in filter housings, they are arranged vertically so that they can be transferred to the waste container by simply lowering them in the vertical direction. In wall installation systems, where the filter cartridges are arranged in rows horizontally next to and on top of each other, they are transferred with their axes standing vertically into the waste container below the opening after being pulled out of their opening in the wall. Due to the practically complete utilization of the waste containers by a plurality of compressed cartridges accommodated in them, the space required for previous deposition is avoided and the number of waste containers required is reduced and, in addition, the previously complex pressing or comminution systems are superfluous.

The device used to carry out the method consists of an air duct having a dust air chamber and a separate clean air chamber and one or more connection housings connected to the air duct and serving to seal the filter cartridges and is characterized in that

that the filter cartridges are arranged in the connection housings with their axes standing vertically, that the connection housing for each filter cartridge has a closable opening in a horizontal plane, which is used to fasten a protective bag or hose, and which serves to replace the filter cartridge, and that a lifting table, which can be used to lift and lower a filter cartridge, can be lifted and lowered, and a waste container that can be connected to an upsetting device and is used as a waste container to hold filter cartridges. Another feature of the device is that the filter cartridge has at least one axially directed ring-shaped filter paper consisting of zigzag-folded filter paper, through which the air to be cleaned flows in the transverse direction, which is received between the two end faces of the filter cartridge, and that one, for example the end face lying on the dust air side, has an annular flange which projects outwards and has a seal and can be brought into abutment with a transverse wall of the connection housing having a corresponding opening.

Further features and modifications of the device result from the dependent claims.

For example, the accompanying drawings show embodiments of the device and it means:

Figure 1 is a schematic representation of an air duct with connection housing, filter cartridge, maintenance table and waste container in a schematic representation when the filter cartridge is in operation.

FIG. 2 representation according to FIG. 1 with the filter cartridge lowered into the waste container;

Fig. 3 Individual representation of the filter cartridge according to Fig. 1;

Fig. 4 representation of a filter cartridge in a modified form;

5 shows a filter cartridge in a further modification;

6 shows a filter cartridge in a further modified form;

7 shows a schematic representation of a filter cartridge according to FIG. 5 or 6 without a pre-filter cartridge inserted;

8 representation according to FIG. 7 with partially inserted filter cartridge;

9 representation according to FIG. 1 in a modified embodiment with cylindrical connection housings for each filter cartridge;

10 side view according to FIG. 9;

FIG. 11 representation according to FIG. 1 in a further modified embodiment, in which a box housing which accommodates all filter cartridges is provided;

FIG. 12 side view according to FIG. 11;

13 representation according to FIG. 11 of a filter cartridge lowered onto the waste container;

14 representation according to FIG. 13 of a filter cartridge accommodated in the waste container and a screw press placed on the waste container;

15 representation according to FIG. 1 in a further modified embodiment;

16 side view according to FIG. 15;

FIG. 17 representation according to FIG. 14 with the filter cartridge compressed;

18 individual representation of the screw press;

19 shows a schematic representation of a wall installation system;

20 shows the movable compression element before the input of a filter cartridge to be reduced in volume into the waste container on a conventional filter housing system;

FIG. 21 representation according to FIG. 20 with a first filter cartridge inserted into the waste container;

22 representation according to FIG. 21 before the volume reduction of the filter cartridge is carried out;

23 representation according to FIG. 22 with the filter cartridge reduced in volume;

FIG. 24 representation according to FIG. 23 with the compression ram extended from the waste container with a protective hose arranged between the compression ram and the waste container;

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25 representation according to FIG. 24 with the protective tube separated and welded at both ends;

FIG. 26 representation according to FIG. 25 with a second filter cartridge which is inserted into the waste container and is to be reduced in volume;

27 representation according to FIG. 26 before lowering the compression die into the waste container.

1 shows an air duct 2 of rectangular cross section, which is received on a stand 1 and is separated by an intermediate plate 5 into an upper dust air chamber 3 and a lower clean air chamber 4. A connection housing 6 is attached to the side of the air duct, which is connected to the dust air chamber 3 via the opening 7 and to the clean air chamber 4 via the opening 8. Below the opening 7, a transverse wall 9 is arranged in the connection housing 6, which has an opening 10 (FIG. 2), which serves for the sealing reception of a filter cartridge 11. As shown in FIG. 1, a height-adjustable maintenance table 12 is arranged below the connection housing 6, while a radiation-proof waste container or a waste barrel 13 is located next to it. The connection housing 6 has on its underside a socket 14 which carries a flange 15 which lies in a horizontal plane and serves to receive a protective bag 16 made of plastic. If a filter cartridge 11 is inserted into the connection housing 6, it is placed in a protective bag 16 on the maintenance table 12, and the end of the protective bag is fastened to the rim ring 15. Then the maintenance table 12 is moved from its retracted position into the raised position shown in broken lines, whereupon the filter cartridge 11 is brought into sealing contact with the transverse wall 9 of the connection housing 6 by clamping elements, whereupon the maintenance table 12 is lowered again and the opening formed by the flange ring 15 is closed by a lid.

If the contaminated filter cartridges 11 are to be replaced, they are, as also described below, lowered down into the waste container or into the waste barrels 13, whereupon the protective bag 16 surrounding the filter cartridges 11 is separated and welded off, and the filter cartridges 11 are compressed in the waste container 13 .

The filter cartridge according to FIG. 1 is shown in detail in FIG. 3. It consists of three ring-shaped filter layers 17, 18, 19 of filter paper folded in a zigzag shape, which are formed into conical ring layers, the ring-shaped filter layer 17 forming the inner, ring-shaped layer 18 the middle and ring-shaped layer 19 forming the outer filter layer. The filter layers 17 to 19 are conical in such a way that two adjacent filter layers 17, 18 and 18, 19 touch at one end, so that V-shaped free annular spaces of opposite conicity arise. The lower converging end of the middle filter layer 17 is received by casting in a plate 20 U-shaped cross section; the upper converging ends of the filter layers 17 and 18 are received in a corresponding ring 22 U-shaped cross section by potting, while the lower converging ends of the filter layers 18 and 19 are received in a corresponding ring 21 U-shaped cross section by potting. The upper free ends of the filter layer 19 are also received in a corresponding ring 23 of U-shaped cross section, which has an outwardly directed sealing flange 24.

The function of the filter cartridge 25 according to FIG. 4 corresponds to that according to FIG. 3, with the difference that the three filter layers 26, 27, 28 are cylindrical and are arranged coaxially to one another. The lower end of the middle filter layer 26 is closed by a bottom 29, while the lower edges of the filter layers 27 and 28 in ent618806

speaking rings 30.31 U-shaped cross section are added by potting. The upper edges of the filter layers 26, 27, 28 are also accommodated in corresponding rings 32, 33, 34 in a U-shaped cross section by potting, an outwardly directed sealing flange 24 being arranged on the ring 34. Arranged between the filter layers 26, 27 and 27, 28 are two annular conical separating plates 35, 36, through which the annular interspaces existing between the filter layers 26, 27 and 27, 28 are divided.

5 shows, in a further modification, a filter cartridge 37 which, on its circumference, carries an annular, closed filter layer 38, which is made of filter paper and is made of zigzag folds and runs in serpentine lines. The lower end of the filter cartridge 37 is closed by a bottom 39, while the upper end is open, and the edge of the filter layer 38 is received by potting in a ring 40 U-shaped cross section, which has the sealing flange 24 on its outside. The filter cartridge 41 according to FIG. 6 corresponds to that according to FIG. 5 with the difference that the filter layer 42 is formed from axially parallel, abutting circular arches made of filter paper folded in a zigzag shape.

FIG. 7 shows a fine filter cartridge 43, which is provided on the underside with a removable base 45, while its upper edge is received in a ring 40 in a U-shaped cross section by potting, which carries a sealing flange 24 on which a seal 44 is arranged . 8, the bottom 45 is removed from the filter cartridge 43, and a pre-filter cartridge 46 is inserted into the resulting opening, which is open at its upper end and closed at its lower end by the bottom 47, which is in a protruding ring flange 48 continues on which a seal 49 is arranged. In the inserted state, the pre-filter cartridge 46 is locked to the fine filter cartridge 43 by the clamping brackets 50 arranged on the flange 48, which overlap a bead 51 of the fine filter cartridge 43 in the locked position and thus connect the two filter cartridges 43, 46 in a sealed manner.

9 and 10 show an embodiment of the device according to the invention; In this embodiment, a separate cylindrical connection housing 52 is provided for each filter cartridge 43 or 43, 46. The connection housings are accommodated on stands 64, so that the connection housings 52 are located above the bottom surface.

A dust-air duct 53 and a clean-air duct 54 are arranged side by side above the connection housings 52. The upper side of the connection housing 52 is designed as a connecting piece 56, which is connected to the clean air duct 54, so that the interior of the connection housing 52 is connected to the clean air duct 54. The dust air duct 53 has a socket 57, which, while penetrating a wall of the socket 56, is connected to a sealing flange 58 located horizontally in the connection housing 52, which carries a known test groove frame 59 on its lower surface, which can be charged with compressed air through a test tube 60. In the wall of the connection housing 52, obliquely upward pressure screws 55 are provided, which engage under the flange arranged on the top of the filter cartridge 43 and press its upper side into sealing engagement with the test groove frame 59. The pressure screws 55 can be actuated from the outside, so that the filter cartridge 43 can be pressed onto the sealing flange 58 from the outside after being introduced into the connection housing 52 by the pressure screws 55. On the underside, the connection housing 52 has a horizontal bend 62 to which the flange ring 15 is attached. The underside of the connection housing 52 is equipped with a closure cover 61, which can be locked to the connection housing 52 by resilient tensioning brackets 63. The protective bag 16 is received on the rim. If in the

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If a filter cartridge consisting of a fine filter cartridge 43 and a pre-filter cartridge 46 is arranged, the pre-filter cartridge 46 can be replaced alone if a replacement is required. For this purpose, the lock 50, 51 of the prefilter cartridge 46 is released, so that it can be pulled down over the protective bag 16 after the closure cover 61 has been removed. If the fine filter cartridge 43 needs to be replaced, the cover 61 is first opened, the pressure screws 55 are then screwed out so far that the ring flange of the filter cartridge 43 can be guided past them downwards. After a board 65 is placed on the waste container 13, the filter cartridge 43 with the protective bag 16 is placed on the board 65, the protective bag 16 is then welded off, so that the filter cartridge 43 is completely enclosed in part of the protective bag 16, while the rest of the protective bag closes the rim ring 15. The board 65 is then removed so that the filter cartridge 43 can be lowered into the waste container 13. The channels 53 and 54, as shown in FIG. 10, are arranged in opposite directions to one another. They lie separately next to one another and connect the connection housing 56.

FIGS. 11 and 12 show a modified embodiment of the device, the function itself being the same as in FIGS. 9 and 10. The filter cartridges 43 are accommodated in a common connection housing 72 which is formed as a box and which is on stands 64 above the ground is held so that the filter cartridges 43 can be inserted into the connection housing 72 from below and removed from it for the purpose of exchange. A duct is arranged above the connection housing 72 and forms a dust air duct 66 with the inlet opening 69 and a clean air duct 67 with the outlet opening 70 through an inclined separating plate 68. On the separating plate 68, the clean air duct 67 is connected by connecting pieces 71 which carry the sealing flanges 58, on which the filter cartridge is held in contact. As shown in FIG. 12, stop strips 73 serving as guides are fastened between the individual filter cartridges 43, on which a threaded spindle 74 is arranged, which penetrates the connection housing 72 downwards and can be actuated by means of a crank 75. On the underside, the connection housing 72 has a right-angled edge 75 for receiving the flange ring 15, which is held in the closed position by the closure cover 61 by means of the clamping bracket 63 designed as hinged screws. The threaded spindles 74 engage on triangular clamping pieces which, when the threaded spindle 74 rotates in one direction, engage under the sealing flange of the filter cartridge 43 and hold them in sealing contact with the sealing flange 58 of the connecting piece 71; with opposite rotation, the clamping pieces 77 are relaxed and folded away to the side so that the filter cartridges 43 are exposed and can be lowered into the waste container 13 in the manner described above via the protective bag 16.

13 and 14 show the process of replacing a filter cartridge 43 in the device according to FIGS. 11 and 12. To replace a contaminated filter cartridge 43, the cover 79 is removed from the connection housing 72 and placed on the waste container 13. The closure cover 79 has a disk 80 protruding from its inner surface, which forms a circumferential annular gap 81 with the edge of the closure cover 79. If the filter cartridge 43 with the protective bag 16 is placed on the disk 80 of the sealing cover 79, the protective bag 16 is separated at the point 78 by welding, so that the filter cartridge 43 is enclosed in the protective bag 16, while the rim 15 is covered by the protective bag residue 16a is closed. After welding, the cover 79 is removed from the waste container 13, and the filter cartridge 43 is lowered into the waste container 13. A screw press 82 is then placed on the waste container 13, which has a threaded spindle 83 equipped with a crank, which carries a pressure plate 87 at its lower free end. The screw press 82 has arms 84, at the ends of which pivotable claws 85 are fastened, which overlap the upper edge of the waste container 13, so that the filter cartridge 43 can be compressed by actuating the threaded spindle 83, as shown in FIG. 17 Screw press can also be provided with a motor 86.

15 and 16 show a further modification of the filter system. The dust air duct 53 and the clean air duct 54 are arranged side by side, as in FIG. 9. Below the ducts 53, 54 there is a box-shaped connection housing 90, which is divided into two chambers by a central partition plate 91 which does not reach all the way to the floor. On the underside of the chambers 53 and 54, tubular connecting pieces 88 are fastened which, like the connecting pieces 71 in FIGS. 11 to 13, carry the sealing flanges for the filter cartridges, which are not shown here. The sockets 88 of the dust air duct 53 receive pre-filter cartridges 92, while the sockets 88 of the clean air duct 54 receive fine filter cartridges 43. In bearings 93 arranged on the bottom of the connection housing 90, tensioning screws 94 are arranged, which can be actuated from the top of the connection housing 90 by handles 95 in order to press the filter cartridges 92, 43 onto the sealing flanges of the connecting pieces 88. The air to be cleaned flows from the dust air duct 53 from the inside to the outside through the pre-filter cartridge 92 in accordance with the arrow directions shown, then enters the clean air duct below the separating plate 91 from the outside through the fine filter cartridge 43. The bottom of the connection housing 90 is provided in the usual way with rim rings 15, which are overlapped by sealing caps 61, which are held in sealing contact with the bottom of the connection housing 90 by tensioning elements 96. The pre-filter cartridges 92 and the fine filter cartridges 43 are exchanged separately in the usual manner using a protective bag 16. The connection housing 90 is accommodated on stands 64 above the bottom, so that the filter cartridges 92, 43 can be transferred to the waste container 13.

FIG. 19 shows a wall installation system in which frames 97 are provided in an intermediate wall of a room in rows next to and above one another, which have openings 15, not shown, for receiving the filter cartridges 37, 41, 43 in a horizontal position. The sealing flanges of the filter cartridges are held in sealing contact with the opening of the frame 97 by means of clamping elements 98. For the purpose of exchanging the filter cartridges, protective tubes 16 are used, in which the filter cartridges are sealed on both sides by welding using the maintenance table 12, from which they are then lowered into the waste container 13, in which they are compressed in the manner described above by a screw press 82 .

FIGS. 20 to 27 show a particularly advantageous embodiment of a device serving to reduce the volume of the filter cartridges loaded with dust. It consists of a frame 99 with a floor 107 which can be moved on wheels 108 and which carries the portable waste container 13. On the side facing away from the filter housing shown in dashed lines, the frame carries a gallows-shaped arm 100, which carries on its free, vertically downward leg 109 a compression die 87, which can be raised and lowered and is located above the waste container 13, so that it is in the latter can be lowered in order to reduce the volume of a filter cartridge accommodated in the waste container 13. As shown in Fig. 20, is on the top

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of the compression die 87, a suspended matter filter cartridge 102 is arranged, which is connected via a bore 103 to the underside of the compression die 87. 22, the suspended matter filter cartridge 102 is arranged on the leg 109 of the arm 100, and is likewise connected to its underside via the linkage of the compression die 87. As shown in FIG. 24, on the side of the bottom 107 facing the filter housing, an arm 110 directed upward is fastened, which carries an horizontal operating table 104 which is directed outwards relative to the frame 99. The operating table 104 is provided with suitable openings, and a hood 106 is attached to its underside, at the end of which there is a paraffin oil mist generator 105.

The operation of the frame 99 is as follows: If a filter cartridge loaded with dust is to be removed from the filter housing, the frame 99 is moved up to the filter housing, and the filter cartridge removed from the housing via a plastic protective bag 16 is placed on the operating table, as Fig. 20 shows. 21, the protective bag 16 is then separated in a known manner and, at the same time, welded off at both ends, so that the filter cartridge is enclosed in the protective bag residue 16b and can be placed in the waste container 13 while the filter cartridge is being opened in the filter housing through the remaining bag 16a is closed. If the filter cartridge is located in the waste container 13, one end of a plastic protective tube 101 is fastened into the rim groove of the rim of the waste container, as shown in FIG. 22, while the other end is sealingly inserted into a rim groove located on the circumference of the compression stamp 87. 23, the compression die 87 is lowered into the lower position shown there, in which it reduces the volume of the filter cartridge to the desired extent. Since the remainder of the bag 16b can be damaged or burst during the volume reduction of the filter cartridge, the protective hose 101 prevents contaminated air from escaping from the waste container 13 into the ambient atmosphere. When the compression die is lowered from the position shown in FIG. 22 into the position shown in FIG. 23, the compression die in the protective tube 101 and

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Waste container 13 displaced air discharged via the suspended matter filter cartridge 102, so that the discharged air is freed of impurities. After the volume of the first filter cartridge is reduced, the compression die 87 is raised from the position shown in FIG. 23 to the position shown in FIG. 24. 25, the protective tube 101 is cut off and welded at both ends, so that there is a tube residue 101a located on the stamp and a larger tube residue 101b attached to the edge of the waste container. In this way it is ensured that before a second contaminated filter cartridge is inserted into the waste container 13, it remains sealed off from the outside atmosphere. 25, the second filter cartridge corresponding to FIGS. 20 and 21 is then introduced into the waste container, wherein it is taken up by the remaining tube 101b, as shown in FIG. 26.

27, a second protective tube 101 is applied to the compression die 87 and the edge of the waste container 13, after which the remaining tube 101a of the first tube 101 is drawn off into the interior of the second tube 101. The compression die 87 is then lowered in the same way as shown in FIGS. 22 and 23, the volume of the second contaminated filter cartridge lying on the first filter cartridge also being reduced. The compression die 87 is then raised to the position shown in FIG. 24, so that a third contaminated filter cartridge according to FIGS. 25 and 26 can be inserted into the waste container 13 and its volume reduced again according to FIG. 27.

If a new filter cartridge is to be inserted into the filter housing instead of the contaminated filter cartridge, this filter cartridge is placed on the operating table 104, for example according to FIG. 24, as shown in FIG. 25. The paraffin oil mist generator 105 is then actuated so that the paraffin mist generated by it enters the filter cartridge via the hood 106 and through the openings in the operating table 104. In this way, it can be reliably checked at the place of use of the filter cartridge whether the filter cartridge to be used still has the required tightness.

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11 sheets of drawings