WO2015155449A1

WO2015155449A1 - Filtering device

Info

Publication number: WO2015155449A1
Application number: PCT/FR2015/050876
Authority: WO
Inventors: Daniel Teboul; Emrah ALTUGLU
Original assignee: Daniel Teboul; Altuglu Emrah
Priority date: 2014-04-07
Filing date: 2015-04-03
Publication date: 2015-10-15
Also published as: FR3019474A1; EP3129151A1; FR3019474B1; EP3129151B1

Abstract

A device for purifying a particle-laden gaseous medium, comprising: an electrostatic filtering chamber (11) having a passage for the particle-laden gaseous medium; suction means (12) for extracting the gaseous medium freed of the particles of same from the chamber, characterised in that the chamber comprises a plurality of emitting structures (23, 23', 23'') arranged in the passage, one after another, between the inlet and the outlet of the chamber, and, to either side of said emitting structures, collecting structures (22) designed to trap the particles contained in the gaseous medium, each emitting structure being in the form of a plate designed to force the gaseous medium to flow adjacent to the collecting structures and comprising, at the periphery of same, tips (26, 26'') directed towards the collecting structures.

Description

FILTRATION DEVICE

The present invention relates to a device for purifying a gaseous medium loaded with particles of all kinds, such as dust particles, organic particles in suspension in the exhaust gases of all kinds, and in particular diesel engines,. ..

It is more particularly intended to be used in an industrial facility, an establishment (hospital, restaurant, ...) or a residential building (house, apartment), especially in the form of a mobile device.

The applicant has already proposed this type of device for treating a gaseous medium loaded with particles, but intended more particularly for the exhaust gas of an internal combustion engine (see in particular the patent application WO 01/19525).

This treatment device comprises a corona electrofilter comprising a cylindrical longitudinal envelope in which extends a longitudinal passage for the gases to be treated, an emissive structure extending longitudinally in the center of the passage and a collector structure extending longitudinally. between the passage and the envelope and comprising a plurality of cavities forming trapping housings of the particles contained in the gaseous medium, the emissive structure comprising a plurality of serrated plates arranged transversely to the longitudinal direction and forming points directed towards the collecting structure . These serrated plates are all carried by a rod connected to a circuit providing a stabilized high voltage.

The present invention aims to provide a device of this type, better suited to the uses mentioned above, while remaining effective, and leading further to other advantages.

It proposes, for this purpose, a device for purifying a gaseous medium loaded with particles, comprising: an electrostatic filtration chamber having a passage for the gaseous medium charged with particles, extending between an inlet of this medium in the chamber and an outlet of the latter;

suction means fluidly connected to this outlet for extracting from the chamber the gaseous medium freed of its particles,

characterized in that the electrostatic filtration chamber comprises a plurality of emissive structures arranged in the passage, one after the other between the inlet and the outlet of the chamber, and on either side of the these emissive structures, collector structures designed to trap the particles contained in the gaseous medium loaded with particles, each emissive structure being in the form of a plate designed to force the gaseous medium loaded with particles to flow in the vicinity of the structures collectors and having, at its periphery, points directed towards the collecting structures.

With these provisions, the present invention provides a purification device optimized in terms of efficiency as well as the aforementioned uses.

It is indeed possible in particular to orient each of the emissive structures or electrodes as desired, in particular to obtain, for example, effects of ozone production or not, to play with the flow of the gaseous medium in the filtration chamber. or even to individually wear each of the electrodes at a different voltage.

More generally, these arrangements also make it possible to produce a device that is easy to manufacture and also to maintain, which, in addition, can be produced, as needed, in the form of a compact structure.

In accordance with special provisions, which may, where appropriate, be combined with one another:

at least one of the emissive structures is steerably mounted in the electrostatic filtration chamber;

each plate is in the form of a blade that can be twisted;

- Each plate has, on either side of a central deflection surface, indentations forming between them said tips; - The tips are arranged staggered along two opposite edges of each plate;

the edges of the plates provided with the tips extend to the vicinity of the collecting structures, leaving only a space avoiding the formation of arcs, in a position in which the plates extend perpendicularly to the collector structures, parallel between them ;

each plate comprises a rod projecting on each of two opposite mounting edges, for mounting the plate on a support;

the support is in the form of a frame provided, for the reception of each rod, with a passage opening thereof;

each emitting structure is carried at high voltage, preferably at a voltage of the order of 10 kV;

each collecting structure comprises, for the trapping of the particles, a metal knit and / or a succession of drawn metal plates;

each collecting structure is raised to high voltage, preferably at a voltage of the order of 5 kV;

the emissive structures are aligned, following an alignment parallel to the collector structures;

each collecting structure has a rectangular parallelepiped shape;

each collecting structure comprises a collector plate mounted on a frame and having at least one connecting element to a circuit providing a high voltage, electrically isolated from the frame.

Other objects, features and advantages of the present invention will become apparent from the description which follows, made with reference to the appended drawings, in which:

FIG. 1 is a schematic perspective view of a device for purifying a gaseous medium charged with particles, according to the present invention;

FIG. 2 is an exploded view, on a different scale, of the main elements of the device of FIG. 1; FIG. 3 is a plan view, schematic and on a different scale, of an emissive structure of this device;

FIG. 4 is a schematic perspective view of an emissive structure support according to another embodiment of the present invention; and

- Figure 5 is a schematic plan view of an emissive structure according to another embodiment of the invention.

The device for purifying a particle-laden gaseous medium which is the subject of the embodiment of FIGS. 1 to 3 is an independent device, which can be mounted on rollers. It has a global configuration of rectangular parallelepiped.

For the sake of highlighting its characteristic elements, this purification device has been shown very schematically in these figures.

The assembly of its various component parts has in particular not been shown in detail, as well known to those skilled in the art.

This purification device 10 generally comprises an electrostatic filtration chamber 11 and suction means 12 downstream of this electrostatic filtration chamber, in order to extract the gaseous medium freed from its particles from the chamber.

In practice, this electrostatic filtration chamber 1 1 is here interposed between an inlet compartment 13 through which the gaseous medium loaded with particles enters the device and more particularly into the electrostatic filtration chamber January 1 and an output compartment 14, in favor of which are housed the suction means 12 and through which the gaseous medium freed of its particles is released into the surrounding environment.

According to the rectangle parallelepiped configuration of the purification device 10, the inlet compartment 13 comprises a frame 15 carried by a bottom 16 and formed of four walls assembled at right angles, one of which, 17, is perforated to allow the gaseous medium to enter the device, here from below the electrostatic filtration chamber 1 1. In the case of the present embodiment, the gaseous medium charged with particles thus enters the purification device 10, in a direction substantially perpendicular to that of flow in the filtration chamber 11.

Before entering this electrostatic filtration chamber, it passes through, here, a prefilter 18 for retaining large particles. This is, for example, a metal knit filter or stretched metal.

At the opposite end of the purification device 10, the outlet compartment 14 of the gaseous medium freed of its particles comprises a box 19 in the form of a rectangular parallelepiped, whose upper wall 20 is perforated to pass this gaseous medium free of its particles. .

The suction means 12, which are here in the form of a fan, are mounted in this box 19, at the face thereof opposite the perforated wall 20.

The gaseous medium thus flows horizontally into the inlet box 15 and then vertically to the outlet of the purification device 10.

As can be seen in Figures 1 and 2, the suction means 12 are arranged directly at the outlet of the electrostatic filtration chamber 1 1 and are in fluid communication therewith to suck the gaseous medium.

This electrostatic filtration chamber 1 1 comprises, here, two supports 21 of emissive structures arranged in the passage formed by the electrostatic filtration chamber January 1 between an inlet therein (after the prefilter 18) and an outlet thereof (just before the suction means 12).

On either side of these emissive structure supports 21 are arranged collecting structures 22 designed to trap the particles contained in the gaseous medium loaded with particles.

Each support 21 of emissive structures comprises, more specifically, a plurality of emissive structures 23 arranged in the passage, one after the other, between the inlet and the outlet of the electrostatic filtration chamber 1 January. Each emissive structure 23 is in the form of a plate, preferably a plate, here five in number by support 21, designed to force the gaseous medium loaded with particles to flow in the vicinity of the collector structures 22.

Each blade 23 also has, at its periphery, points directed towards the collecting structures 22.

It is more particularly, as can be seen more clearly in FIG. 3, a blade 23 having, on either side of a central deflection surface 24, notches 25 forming between them said tips 26.

This is, here, rounded indentations cut into a stainless steel plate so that the tips of the two opposite edges of the blade 23 provided with these points 26 are arranged in staggered rows.

Each support 21 comprises two U-shaped sections 27 assembled, parallel to each other and back-to-back, by four spacers 28 welded, each, to a corner of the U-profile 27. It should be noted in this connection that the fourth spacer 28 is not visible in the figures.

Each blade 23 comprises, for its mounting on this support 21, a rod 29 welded on each of two opposite mounting edges 30 which extend generally perpendicular to the edges of the blades 23 provided with the tips 26.

The U-shaped sections 27 are provided, for the reception of the rods 29, passage openings 31 of these rods.

The holding in position on the support 21 of each of the blades is obtained, in the case of the present embodiment, by means of the interposition of an insulator 32 nested, by complementarity of shapes (of square section), in an opening 31 and receiving, itself, a rod 29 of the blade 23.

Each rod 29 is, for this purpose, threaded and engaged in a central cylindrical hole of the insulator 32 and fixed by a nut (not visible in the figures and housed in a through hole 36 of square section preceding this cylindrical hole in the isolator and ending before this last hole by a bearing surface for the nut), so that each blade is mounted with possibility of angular orientation in the electrostatic filtration chamber 1 1.

It should be noted here that in other embodiments, the insulator may also be protected by means of a bell and a counter-bell or deflectors, in the manner of that described in the application for patent cited above (WO 01/19525). This allows in particular to avoid electric bridges.

Each blade 23 forming an emitting structure is here brought to a cathode voltage of the order of 10 kV by a circuit providing a high voltage 33, housed in a control box 34 mounted, in the context of the present embodiment, in the box 19.

For the trapping of the particles, each collecting structure 22 comprises, in the context of the present embodiment, a metal knit in the form of a plate carried here, at an anode voltage of the order of 5 kV, being connected to a circuit 35 providing a high voltage, which is also housed in the control box 34.

For their high voltage supply, the collector plates 22 can be mounted in a frame via rods passing through openings in this frame and interposed insulators, in a manner similar to that provided for the blades 23. on their support 21. Therefore, this has not been shown in the figures, for the sake of simplification.

However, it will be noted that the connection to the circuit 35 can be obtained for example with a leaf spring secured to the upper box 19 and in contact with a rod of the plate 22. The implementation of one or more of these blades can also allow to maintain the plate in position within the device and its establishment and withdrawal thereof.

In the case of the central collector plates 22, the retention in place is ensured by their arrangement between the two supports 21 (their introduction and removal is obtained by simple sliding).

Such arrangements are not shown, for the sake of simplicity, in Figures 1 to 3, but can be easily implemented by those skilled in the art from the above explanations. The purification device according to the present invention, as described in particular with reference to FIGS. 1 to 3, thus proves to be particularly flexible, in particular by mounting the blades 23 on the supports 21, one independently of the other ( and electrically isolated from each other on their support). This makes it possible, in particular, to orient each of the blades as desired, in particular to produce ozone having a germicidal effect on microorganisms of the virus and bacteria type. This ozone production can be obtained by orienting the blades 23 perpendicularly to the collector plates 22, while a different orientation of the perpendicular (the tips are moved away from the collector structures 22) will stop or decrease this production of ozone.

Of course, the blades 23 are always oriented so as to form a non-zero angle with the plane of the collector plates 22 which extend parallel to each other, the blades 23 themselves being aligned in a parallel alignment to these same plans.

Note also that the edges of the blades 23 provided with the tips 26, extend to the vicinity of the collector plates 22, leaving only a space avoiding the formation of arches in a position in which the blades 23 ' extend perpendicularly to these collector plates 22 is, in practice, a space of the order of one millimeter for 1000V voltage applied to the corresponding blade 23.

In addition, negative ions produced by the ionization occurring in the electrostatic filtration chamber are also interesting in terms of the therapeutic effects they can generate.

It will also be noted that the possibility of orienting the blades 23 makes it possible to play with the speed of the gaseous flow flowing in the electrostatic filtration chamber 11.

A door 37 is, moreover, provided for insulating the side collector plates 22 from the surrounding medium, while being able to access it to remove them from the purification device 10 for cleaning.

This device is also easy to manufacture, for example from a cut and, where appropriate, a folding of stainless steel plates. Moreover, such a device can also be easily implemented in existing systems.

In a reverse configuration (it would be enough to turn the fan and move the prefilter 18), the air to be treated could be sucked up and be rejected from the bottom of the device. Such a configuration would advantageously be used in ventilation ducts.

It can be added that the device can operate vertically, as shown in Figures 1 to 3, or horizontally.

According to another possibility (see FIG. 4), it is conceivable, for example, to use two rows of emissive structures 23 ', here plates, extending side by side, preferably parallel to one another, in the passage, with a staggered arrangement of one row relative to the other. A single support 21 'is also provided in the context of this embodiment for carrying these emissive structures 23'.

According to yet another embodiment of the emissive structures

23 ", shown in FIG. 5, the tips 26" do not protrude from the periphery of each of the plates, but are formed inside the corresponding plate, by means of a longitudinal cut made in it at neighborhood of each of its longitudinal edges.

It is more specifically, on each side of the plate, a cut forming two rows of rounded indentations 25 ", facing each other and forming between them the points 26" directed towards the collector structures.

Each cutout is further formed so that the tips 26 "of the two rows are staggered.

Of course, the present invention is not limited to the embodiments chosen and shown, but encompasses any variant within the scope of the skilled person.

In particular, the device according to the invention could comprise a UV radiation lamp arranged upstream of the inlet of the electrostatic filtration chamber January 1 (for example in the box 15) to attract and kill insects, such as mosquitoes. At the opposite end, a finishing filter, for example based on activated charcoal, metal knit or stretched metal, can also be implemented between the electrostatic filtration chamber 1 1 and the suction means 12.

Each collector structure may further comprise one or a succession of metal plates drawn in place of the metal knit or be made from an alternation of metal knit and stretched metal plates.

Other voltages can also be envisaged for the emitting and collecting structures. In particular, it may be envisaged to wear, in a succession of stretched metal plates forming a collector structure, one plate out of two at a voltage of the order of 5 kV and to put the next to ground. Generally, the voltages are chosen to be between 10 and 50 kV.

Depending on the voltage that is decided to apply to the emissive and collector structures, the circuit providing a high voltage will of course provide a positive or negative high voltage.

Another possibility could be to wear one out of two emissive structures at a positive high voltage and the other at a negative high voltage, while the collector structures would be grounded or a positive high voltage.

It will be noted, moreover, that a frame, made from profiles, such as angles, can come to complete the device, for example for its mounting on wheels or the introduction of the central collector plates on rails in the form of U to facilitate their sliding.

Even more than two emissive structure supports can furthermore be envisaged.

In addition, each blade may, to increase turbulence in the suction flow, be twisted.

Claims

1. Device for purifying a gaseous medium charged with particles, comprising:

an electrostatic filtration chamber (1 1) having a passage for the gaseous medium charged with particles, extending between an inlet of this medium in the chamber and an outlet thereof;

suction means (12) fluidly connected to this outlet for extracting from the chamber the gaseous medium freed of its particles,

characterized in that the electrostatic filtration chamber comprises a plurality of emitting structures (23; 23 '; 23 ") arranged in the passageway, one after the other between the inlet and the outlet of the chamber, and, on either side of these emissive structures, collector structures (22) designed to trap the particles contained in the gaseous medium charged with particles, each emissive structure being in the form of a plate designed to force the medium gas charged with particles to flow in the vicinity of the collector structures and having, at its periphery, spikes (26; 26 ") directed towards the collector structures.

2. Device according to claim 1, wherein at least one of the emissive structures is steerably mounted in the electrostatic filtration chamber.

3. Device according to claim 1 or 2, wherein each plate is in the form of a blade that can be twisted.

4. Device according to any one of claims 1 to 3, wherein each plate has, on both sides of a surface central deflection, indentations forming between them said tips.

The device of claim 4, wherein the tips are staggered along two opposite edges of each plate.

6. Device according to claim 4 or 5, wherein the edges of the plates provided with the tips extend to the vicinity of the collector structures, leaving only a space avoiding the formation of arcs, in a position in which the plates extend perpendicular to the collector structures, parallel to each other.

7. Device according to any one of claims 1 to 6, wherein each plate comprises a rod (29) projecting on each of two opposite mounting edges, for mounting the plate on a support.

8. Device according to claim 7, wherein the support is in the form of a frame provided, for the reception of each rod, a passage opening thereof.

9. Device according to any one of claims 1 to 8, wherein each emitting structure is raised to high voltage, preferably at a voltage of the order of 10 kV.

10. Device according to any one of claims 1 to 9, wherein each collecting structure comprises, for the trapping of the particles, a metal knit and / or a succession of drawn metal plates.

1 1. Device according to any one of claims 1 to 10, wherein each collecting structure is carried at high voltage, preferably at a voltage of the order of 5 kV.

12. Device according to any one of claims 1 to 1 1, wherein the emissive structures are aligned in an alignment parallel to the collector structures.

13. Device according to any one of claims 1 to 12, wherein each collecting structure has a rectangular parallelepiped shape.