FR2533142A1 - FILTER BOX FOR PURIFYING GAS OR AIR CURRENTS - Google Patents

Abstract

A. FILTER HOUSING FOR GAS OR AIR CURRENT CLEANING. B. FILTERING HOUSING CHARACTERIZED IN THAT: - THE SUPPORT GRILLE 13 IS CLOSED ON ITS FRONT SIDE TURNED TOWARDS THE ENTRY CHAMBER 7 BY MEANS OF A COVERING PLATE 19 ON THE EDGE 20 OF WHICH IS STRONGLY TIGHTENED. ONE OF THE ENDS 21 OF THE FIBER BED OF THE LAYER OF FILTERING MATERIAL 15 WROUGHT UP ON THE SUPPORT GRID 13; -ON THE OTHER FRONT SIDE OF THE SUPPORT GRID 13 IS THE EXHAUST SIDE TO A HOLLOW BOX 11, THE INTERIOR SPACE OF WHICH CONNECTS THE INTERIOR 23 OF THE FILTERING PACKAGE 17 WITH THE OUTPUT CONNECTION 4; C. THE INVENTION CONCERNS FILTRATION OF CONTAMINATED AIR IN NUCLEAR INSTALLATIONS.

Description

iFilter box for the purification of gas currents

or air -

  The invention relates to a filter box

  for purifying gas or air streams, in particular

  to tie air to evacuate nuclear installations,

  containing radioactive substances, in the event of disturbances

  bations, characterized in that the box comprises two inlet connections

  and evacuation, placed on the walls of its fronts

  tales-; -between the entrance and exit rooms

  adjoined to these connections, it is placed on a building

  support support made of tubes, or on a support grid, in the box, a substantially annular filter package whose dimensions are smaller than those of the box, the passage of gases through the package

  filtering in the box is carried out radially, from the

  inwards, and the evacuation of the purified gas is done axially from the interior of the filter pack by one of its front openings which is connected with the outlet connection; the filtering layer of the filter pack consists of metal fiber sheets which are held radially on the outside and on the inside by

  shut-off screens which can be traversed by the current.

  Filter boxes are already known which have filtering elements which are made of fiberglass paper on chassas wood or steel and include sealing masses and organic insulating masses These filters are however deprived of heat resistance , poorly resistant to radiation, * 5 present and poor ability to accumulate

  and have low mechanical strength.

  The object of the invention is to provide a filter box comprising an interchangeable filter pad for filtering the atmosphere of

  in the event of serious disturbances in

  Nucelaria, in which the suspended solids filter, the preparatory filter and the separator are united into a single building element and which furthermore offers the lowest possible pressure drop for high separation power, and resistance

  raised against disruptive influences.

  To solve this problem the invention proposes a combination of features where: the support grid is closed on its front face facing the inlet chamber by means of a

  cover plate on the edge of which is strong-

  one of the ends of the layer of fibers of the layer of filter material wound on the support grid is tightened tightly; on the other end face of the support grid is placed the discharge side to a hollow box, the inner space connects the inside of the filter package with the outlet connector; on the circumference of the box recessed hermetically in the wall of the box, corresponding to the

  outlet and whose section corresponds

  In the form of the filter package, the other end of the layers of fibers of the filter material layer wound on the support grid is hermetically sealed. the cover plate is removably attached to the box; the wall placed hermetically on the box can be detached from this box to change the filter package, with the box, the filter package

  as well as the cover plate.

  Thanks to this embodiment, we realize

  a particulate filter in class 5

  It has the following advantageous properties: 1 The suspended matter filter the drop separator and the preparatory filter are closed

a unit.

  2 Heat resistance can go

up to about 55000.

  3 The filter is resistant to irradiation

only at high doses.

  4 A very low pressure drop with a high ability to accumulate materials is obtained. mechanical stability is high even

under the effect of disturbances.

  6 The filter is able to be cleaned, resists moisture with steam and water and is

  insensitive to corrosion and solvent vapors.

  The invention will be better understood in

  of the description below and the attached drawings

  Embodiments of the invention, in which: FIG. 1 schematically shows a side elevational view of the section box;

  FIG. 2 is a section along AB of -

  Figure 1; Figure 3 is a section along CD of Figure 1;

  Figure 4 is a side view as-

  FIG. 1 of another embodiment of the packing

  the box or filter pack.

  FIG. 5 is a section along E-F of

Figure 4.

  The interior space 2 of the box 1 is traversed from the inlet connection 3 horizontally to the outlet connection 4 by the stream of gas 5 to be purified. The inlet connection 3 is embedded in the side wall 6 and go to the arrival room 7 which forms the part

  placed in front of the filter of the interior space 2.

  The opposite wall 8 of the casing 1 is

  It is fixed and sealed by means of the screws and the gasket 10. In this wall 8 is inserted hermetically a hollow box 11, the inner part 24 of which forms the flow chamber of the flow is connected to the outlet connection 4, via a piece of liaison 12

  also hollow On this hollow box 11 is adjusted laterally.

  on its opening, a support grid 13, which

  is about the oval shape of a compressed ring.

  The support grid 15 is fixed on the circumference of the

  caisson 11 iqui has about the same trans-

  and extends horizontally through the entire chamber 1 to the vicinity of the side wall 6 On its circumference 16 is wound, in rings, the filter material 45, outer sieves 18 and inner 14, formed by t 8 perforated or wire meshes providing here the radial maintenance necessary for the filtering material, which consists of strips of metal fibers in the form of strips, wound on the circumference 16 The sheets consist of a web of stainless steel fibers the diameters of the fibers are 4 and 2 μm. A multi-bed fiber fleece of 2 μm has been proven for the separation of particles of 0.1 μm Mn, this veil being provided with

  thicker fiber base and cover for easy

  Manipulation The actual filter pack 17 whose axis 27 is placed horizontally, and which is hollow and surrounds the inner space 23, thus consists of the parts 13 to 18, and is traversed radially from its circumference inwards For this purpose, the front face of the support grid 13 facing the inlet connection 3 is closed by a front plate 19, on the rotating edge 20 of which is tightly tight, on the circumference, one of the sides- The other end 22 of the fiber plies 15 is strongly tightened around the circumference of the casing 11, so that an oval filter package is obtained, one end face of which is closed by means of the plate 19. and the other end face of which the air to be discharged is directed by the box 11 through the connecting piece 12 to the

outlet fitting 4.

  A hook 25 is fixed on the plate 19,

  facing the inlet fitting 3 and is attached to the frame

  sis 26 connected to the box 1 We can also design instead

  of this construction, other possibilities of fixing.

  In this way, the filter package 17 is held by one of its ends, in the middle of the box The other end is maintained, as already described by the wall 8 of the box In this way, one can very simply pick up the filter package 17 of the frame 26 after having unscrewed the screws 9, pull it horizontally out of the box 1 and replace it with another On the bottom of the box 1 is a tank 28 carrying an exhaust connection 29

  where we can extract the liquid that might be

  separately on the filter package 17.

  In FIGS. 4 and 5, there is shown a box which contains a filter lining whose shape is a little different. The box 101 is here in principle the same as that designated by 1 of FIGS. 1 to 39. However, the filter material is not fixed on an annular grid construction, but on the contrary on

  the open lateral surface 115 of an intermediate casing

area 114.

  The interior space 102 of the box 101 is also traveled from the inlet connection 103 to the outlet connection 104, by the gas stream 105 to be purified. The inlet fitting 103 is placed on the side wall δ <4,107 and opens onto the inlet chamber 106 which forms a part of the interior space 102. The outlet connection 104, together with the parts 110 and 111 which are part of it, is fixed by screwing on the wall 108 opposite This connection is removable through the screws 109 and is sealed against the housing 101 The connection between the outlet connector 104 and the interior space 102 of the box is formed

  here by the conical piece of transition 110 laid directly-

  on this connection and the box 111 connected thereto, the wall of which is hermetically embedded in the removable wall 108 of the box 101. The elements described are

  hitherto similar to those of Figure 1.

  The casing 111 which substantially forms, in FIGS. 1 to 3, the axial extension of the grating

  oval support, however, is placed on the circumference

  a hollow, disc-shaped sub-chamber 114, the interior space 116 of which forms the chamber

  after the filtering material

  mediator 114 is open on its side surfaces 113, inner stop sieves 112 being placed in the openings On these sieves is placed the filter material itself, that is to say here too, steel fiber webs stainless steel of the type already mentioned, which exceed the edge 118 of the intermediate box 114 and which

  are strongly tightened at this point.

  filter material 115 and as a result of the

  The filter bag 117 is formed by the outer filter screens 119, which are clamped, by means of the stirrup 120, against each other, or against the intermediate box 114. 121, crosswise, which ensure

  the filter package 117 radially inwardly.

  The entire filter package 117 is here suspended in a manner similar to that shown in Figures 1 and 2, with a hook 122 on a portion 123 of the box 101 and can be easily unhooked to change the filter material or l together, and be removed,

after removing the screws 109.

s 533142

Claims (2)

REVENDI CATIONS) Filter box for the purification of gas or air currents, in particular of the air to be discharged from nuclear installations, containing radioactive substances, in the event of disturbances, characterized in that: the box has inlet and outlet connections, placed on the walls of its fronts; between the inlet and outlet chambers adjoined to these connections, it is placed, on a support construction made of tubes, or on a support grid, in the box, a substantially annular filter package whose dimensions are smaller than to those of the caisson; the passage of the gases through the filter pack in the box is carried out radially, from the outside to the inside, and the evacuation of the purified gas is done axially from the inside of the filter package by a its front openings which is in connection with the outlet fitting; the filtering layer of the filtering package consists of metal fiber sheets which are held radially on the outside and inside by stop screens which can be traversed by the filtering box stream, characterized in that: the support grid (13) is closed on its end face facing the inlet chamber (7) by means of a cover plate (19) on the edge (20) of which is tightly clamped one of the ends (21) of the web of fibers of the layer of filter material (15) wound on the support grid (13); on the other end face of the support grid (13) is placed the evacuation side towards a hollow box (11), whose inner space connects the inside (23) of the filter pack (17) with the outlet fitting (4); on the circumference of the box (11) hermetically embedded in the wall (8) of the box, corresponding to the outlet fitting (4) and whose section corresponds substantially to the shape of the filter package (17), is tightly tightened the other end (22) webs of fibers of the filter material layer (15) wound on the support grid (13); the cover plate (19) is removably attached to the box (1); the wall (8) placed hermetically on the box (1) can be detached from this box (1), to change the filter pack (17), with the box (11), the filter pack (17) and the plate covering (19).   2) filter box for purifying gas or air streams according to claim 1 l characterized in that: the box has on the walls of its end faces inlet and outlet connections which are put there; -   between the inlet and outlet chambers adjoined to these connections, it is inserted into the caisson on a support construction, a filtering package whose dimensions are smaller than those of the caisson, the filtering layer of the filtering package consists of layers of fibers Metals which are held outdoors and indoors by means of current-permeable sieves; filter box characterized by the combination of the following features: the filter pack (117) is constituted by a hollow, disk-shaped intermediate box (114) whose side surfaces (113) are open and whose circumference is connected to a chest (111) whose interior space is open to the interior space (116) 53 T 3142   intermediate box (114); the box (111) is connected to the outlet fitting (104) and hermetically passes through the wall (108) to which it is attached; on the open side surfaces (113) are placed stop sieves (112); the layers of fibers (115) are placed on these arresting or holding sieves (112), these sheets being tightly tightened on the circumference of the lateral surfaces (113) of the intermediate box (114); the intermediate casing (114) is hooked, removable, in the filter casing (101), the wall (108) placed hermetically on the filter casing (101) can be detached from this casing (101) to change-the filter pack ( 117) with the intermediate box (114), the box (111) and the filter package (117).