System for filtering an aerosol using a plurality of cyclone separators and filtering method

Abstract

A filtration system includes an inlet for receiving an aerosol and a separator (5) for separating a carrier gas from particles. The separator (5) comprises a plurality of cyclone separators (6) arranged in groups of cyclone separators (6) and positioned side-by-side in a ring. Each group of cyclone separators (6) has an inlet opening (7), a first cyclone separator (6a), a second cyclone separator (6b), and a conveying channel (8) connecting the inlet opening (7) to each of the first and second cyclone separators (6a, 6b) to deliver the aerosol. The first cyclone separator (6a) has an inlet opening into the conveying channel (8) that is lower than the inlet opening of the second cyclone separator (6b).

Description

technical field

[0001] The invention relates to a filtration system and a filtration method. State of the art

[0002] In many technical fields, it is common practice to inject oil to facilitate cutting, engraving, cooling, or surface treatment operations. The injected oil is often in the form of droplets that saturate the atmosphere surrounding the cutting, engraving, cooling, or surface treatment equipment. These oil-laden atmospheres are called oil mists.

[0003] It is particularly beneficial to recover oil for reuse and / or recycling, thereby maintaining a healthy atmosphere. Therefore, filtering the air laden with oil droplets is advantageous in order to separate the gaseous and liquid components. The oil mist is transferred to a filtration device configured to separate the carrier gas from the oil droplets.

[0004] It is known that filtration systems perform filtration by cyclone effect. Cyclone separation allows for the separation of the carrier gas and oil droplets without the use of one or more filters that become clogged and therefore require regular cleaning.

[0005] The separation efficiency depends on the centrifugal acceleration experienced by the droplets, the number of revolutions within the cyclone, their density, and their size. Therefore, it is advantageous to find a cyclone configuration that is best suited to the oil droplets.

[0006] Generally, filtration efficiency increases with higher velocities or a greater number of cyclones. Therefore, an optimum must be found between filtration efficiency and the compactness of the filtration system. US patent 2009 / 0139192 discloses a filtration system where several cyclone separators are arranged along an aerosol supply channel on either side of it. Such a configuration is not advantageous because it consumes a considerable amount of space. US patent 4,389,307 presents a very similar approach with the same drawbacks.

[0007] Document EP41224389 discloses a filtration system using multiple cyclone separators. The separators are fed from a single feed channel and are arranged one behind the other along the feed channel so that they are fed in parallel. The cross-section of the feed channel decreases each time a portion of the flow to be filtered is captured by a separator. Description of the invention

[0008] One object of the invention is to provide a filtration system which provides greater compactness without degrading its ability to efficiently separate particles and the gaseous medium of the aerosol.

[0009] These drawbacks are addressed by means of a filtration system which includes: an inlet intended to be connected to a supply unit configured to supply the aerosol; a separator configured to separate the carrier gas and the particles, the separator comprising a plurality of cyclone separators distributed in groups of cyclone separators, the groups of cyclone separators being arranged next to each other in the form of a ring around the inlet, each group of cyclone separators having an inlet opening, at least one first cyclone separator and one second cyclone separator and a delivery channel connecting the inlet opening to each of at least one first cyclone separator and one second cyclone separator to receive the aerosol from the inlet; in which each first cyclone-effect separator has a mouth inlet opening into the conveying channel which is lower than an inlet mouth (6') of each second separator by cyclone effect.

[0010] According to an advantageous aspect of the invention, the separator is fixed to a lower dome and an upper dome to form a sealed cavity, the lower dome defining the inlet.

[0011] Preferably, a distributor is arranged between the lower dome and the upper dome inside the separator, the distributor defining a plurality of pipes opposite the inlet openings in horizontal directions.

[0012] Advantageously, each pipe is curved to direct an aerosol flow from the inlet to the inlet openings of the separator, the curvature being observed along a longitudinal extension direction of the separators by cyclone effect.

[0013] Preferably, the distributor is mounted to rotate freely around a vertical axis of rotation passing through the inlet.

[0014] It is advantageous to provide for the distributor to be a fan propelling the aerosol towards the inlet openings.

[0015] In a preferred embodiment, the first cyclone separator is closer to the inlet than the second cyclone separator in a vertical observation.

[0016] In a preferred configuration, the first cyclone separator is partially blocked by a first plug extending deeper than a second plug partially blocking the second cyclone separator, the first plug blocking an upper part of the inlet mouth to form a side wall of the conveying channel towards the second cyclone separator and prevent aerosol entry.

[0017] Advantageously, each group of cyclone separators is mounted removable from the other groups of cyclone separators.

[0018] In another preferred development, the cyclone separator groups are arranged in a circle around the inlet, with the cyclone separator groups being fixed to each other with a watertight connection.

[0019] It is further advantageous to provide that the cyclone separator groups define a male part and a female part, the male part of one of the cyclone separator groups inserting into the female part of another adjacent cyclone separator group to form the watertight connection.

[0020] The invention also relates to a filtration process that is efficient and simple to use.

[0021] This result is achieved by means of a filtration process for an aerosol containing particles and a gaseous medium, comprising the following steps: provide a filtration system according to any of the previous configurations; supply the filtration system with an aerosol; recover the particles at the outlet of the separators by cyclone effect. Description of the drawings

[0022] Other advantages and features will become clearer from the following description of particular embodiments and implementations of the invention, given by way of non-limiting examples and shown in the accompanying drawings, in which: There figure 1 schematically illustrates a top view of a filtration system according to a first embodiment; The figure 2 schematically illustrates a perspective view of the filtration system shown in the figure 1 ; There figure 3schematically illustrates a perspective view of the filtration system shown in the figure 1 with a fan-type distributor; The figure 4 schematically illustrates another perspective view of the filtration system shown in the figure 1 ; There figure 5 schematically illustrates a view of a group of cyclone separators; The figure 6 schematically illustrates a view of a group of cyclone separators with a vertical cross-section of the conveying channel and the tubes intended to form the cyclones; The figure 7 schematically illustrates a vertical cross-sectional view of a group of cyclone separators, the cross-section passing through the conveying channel and the tubes intended to form the cyclones. Detailed description

[0023] Filtration system 1 is a system for filtering an aerosol. An aerosol is formed by a collection of solid or liquid particles suspended in a gaseous medium. For example, filtration system 1 is a system for filtering an atmosphere laden with oil droplets. Filtration system 1 is configured to separate the carrier gas from the oil present in the atmosphere in the form of droplets. The carrier gas can be air. The carrier gas supports the oil droplets. Filtration system 1 is configured to facilitate the recovery of the particles, and more specifically, the oil.

[0024] The particles are discharged through a first outlet 2. The carrier gas is discharged through another outlet 3 and can also be partially discharged through the first outlet 2. Advantageously, the particles are discharged through a lower outlet while the carrier gas is discharged through an upper outlet to take advantage of the density difference between these two components. The lower outlet is at a lower altitude than the upper outlet.

[0025] The filtration system 1 has an inlet 4 for connection to a supply device configured to provide an aerosol to be treated, such as an atmosphere laden with oil droplets. The inlet 4 receives a mixture containing a carrier gas and particles, for example, droplets. If the aerosol is an oil mist, it can be supplied from equipment that uses oil and forms the oil spray. Alternatively, the aerosol is supplied from a reservoir receiving the atmosphere to be treated. The inlet 4 is connected to a separator 5 so that the separator 5 receives the aerosol. The separator 5 is configured to separate the carrier gas and the particles. The inlet 4 can be formed by a feed channel that connects the aerosol source to the filtration system 1, having a first end, or the filtration system 1 can be directly connected to the aerosol source.

[0026] The arrows illustrated at figures 4 And 7 These represent the flow directions of an oil mist within the filtration system 1, and more specifically, the direction of particle flow. The aerosol is set in motion to enter the filtration system 1 by means of a ventilation system, for example, a fan. Depending on the configuration, the ventilation system is located upstream, downstream, or within the filtration system 1 so that the aerosol enters the filtration system 1 at a certain velocity. Preferably, the ventilation system is part of the aerosol source.

[0027] The separator 5 is equipped with a plurality of cyclone separators 6, which are divided into groups of cyclone separators 6. The groups of cyclone separators 6 are arranged side by side in the form of a ring, preferably a circular ring. The groups of cyclone separators 6 are preferably fed in parallel from the inlet 4. Each group of cyclone separators 6 has an inlet opening 7, at least one first cyclone separator 6a and one second cyclone separator 6b, and a routing channel 8 connecting the inlet opening 7 to each of at least one first cyclone separator 6a and one second cyclone separator 6b.

[0028] Preferably, the inlet 4 is connected to the plurality of cyclone separator groups 6 by means of a plurality of pipes 9. Each pipe 9 is associated with a cyclone separator group 6 to ensure the transfer of the aerosol from the inlet 4. Each pipe 9 connects at least one inlet opening 7 of a cyclone separator group 6 associated with the feed inlet 4. Preferably, there are as many pipes 9 as there are inlet openings 7.

[0029] It is possible to define a cutting plane that passes through all the cyclone separators and allows observation of the annular shape defined by the multiple cyclone separators. In operation, this cutting plane is preferably a horizontal plane. The normal to the cutting plane is then a vertical direction.

[0030] Aerosol is supplied through inlet 4, and the flow has a component perpendicular to the plane, preferably in the vertical direction, which is significant. Preferably, the flow is vertical or nearly vertical. Inlet 4 and / or the ducts 9 transform a flow with a predominantly vertical component into several flows with a predominantly horizontal component. It is advantageous for the transformation of a vertical flow into a horizontal flow to take place along a curved wall. The curvature is particularly advantageous when the distributor is mounted to rotate about an axis perpendicular to the cutting plane.

[0031] Particularly advantageously, when viewed from the normal to the plane, the pipes 9 are curved, preferably with the lateral walls delimiting the pipes 9 in the form of circular arcs with a constant or progressively increasing radius from one end to the opposite end, so that the aerosol flow originating from the inlet 4 and moving predominantly in a vertical direction flows in the pipe 9 in a horizontal direction over a relatively large distance to ensure that the flow is stable when it enters the separator by cyclone effect 6. It is advantageous for the cross-section of each pipe 9 to increase as one moves away from the inlet 4 so as to have an aerosol flow that is better suited to the configuration of the conveying channel 8.

[0032] When the pipes 9 are fixed, it is advantageous for the number of pipes to be an integer number of times the number of inlet openings 7.

[0033] The cyclone separators 6 are arranged around the inlet 4. The pipes 9 extend from the inlet 4 to the inlet openings 7 of the groups of cyclone separators 6. The cyclone separators 6 and the pipes 9 are crossed by a plane which is a horizontal plane, that is to say a plane perpendicular to the longitudinal direction of the cyclone separators 6 and which represents the mean axis of movement of the particles in the cyclone separators 6.

[0034] A cyclone separator 6 has an inlet 6' receiving the mixture to be separated and preferably two separate outlets. Each cyclone separator 6 has a first outlet 2 for recovering aerosol particles, preferably oil, and a second outlet 3 for recovering the carrier gas free of oil or with an oil content lower than the oil content entering through the inlet 6'. The cyclone separator 6 uses the effect of gravity to separate the particles and the carrier gas.

[0035] The inlet 6' of each cyclone separator 6 opens into the conveying channel 8, so that each cyclone separator 6 receives a fraction of the flow of the atmosphere to be treated. The cyclone separators 6 receive the same, or substantially the same, atmosphere to be treated at their inlet 6'.

[0036] A cyclone separator 6 is a separator having an inlet 6' that engages in a cone or a structure substantially cone-shaped. In the illustrated embodiment, the upper part of the cyclone separator 6 has a circular cross-section, while the lower part has a conical, or more specifically frustoconical, cross-section. The lower end of the cyclone separator 6 is open to form the outlet 2 for oil extraction. The upper part of the cyclone separator 6 is preferably covered by a plug 10, which defines a through-hole. This through-hole forms the second outlet 3 for the carrier gas, which has a low oil content.

[0037] To increase the efficiency of the separation between the carrier gas and particles, particularly oil, it is beneficial to have a cyclone separator 6 with a small diameter. The smaller the diameter, the greater the centrifugal effect for a given velocity of the atmosphere being treated as it passes through the inlet 4. Therefore, reducing the cross-section of the conical section is advantageous in order to increase the gas flow velocity and thus improve oil separation.

[0038] However, the smaller the diameter of the cyclone separator 6, the smaller the volume of gas processed. Therefore, it is advantageous to feed several cyclone separators 6 connected in parallel to increase the amount of carrier gas processed over a given time. Increasing the number of cyclone separators 6 increases the overall size of the filtration system 1.

[0039] In order to process a large volume of aerosol in a small space, it is advantageous to have several groups of cyclone separators which are fed in parallel from the inlet 4 for example by means of the multiple pipes 9 which receive the aerosol from the outlet of the inlet 4 and to have cyclone separators 6 fed by a conveying channel 8 where the conditions of movement of the aerosol are better controlled.

[0040] Advantageously, the first cyclone separator 6a and the second cyclone separator 6b have inlet openings 6' arranged in two different planes and separated by a separating plane AA. The separating plane AA is the plane that separates all the first cyclone separators 6a and all the second cyclone separators 6b. The separating plane AA is horizontal or nearly horizontal.

[0041] Preferably, the first cyclone separator 6a has an inlet mouth 6' which is arranged in a plane lower than the inlet mouth 6' of the second cyclone separator 6b. Il is advantageous that the multiple cyclone separators 6 of the cyclone separator group 6 have an inlet mouth 6' higher than the previous inlet mouth 6' as one moves away from the inlet opening 7.

[0042] To limit the vertical displacement components of the aerosol, it is advantageous for the delivery channel 8 to divide into as many channels as there are cyclone separators 6 in the group of cyclone separators 6. It is also advantageous for each channel to terminate by opening into its associated cyclone separator, i.e., it should not extend beyond the inlet 6'. figure 6Figure 6 illustrates a group of cyclone separators containing two cyclone separators. The channel opening into the first cyclone separator 6a does not open into the second cyclone separator 6b, and vice versa, to prevent mixing of the flows between the two cyclone separators. This limits the vertical components of the flows within the cyclone separators and thus improves filtration. The channels are preferably sealed off from each other.

[0043] In the particular embodiment illustrated, the plug 10 has a first plug that partially closes the upper end of the first cyclone separator 6a to define the cross-section of the second outlet 3. The plug 10 is advantageously used to block a portion of the inlet opening 6' defined by the lateral wall that delimits the first cyclone separator 6a. The portion not blocked by the plug 10 forms the active part of the inlet opening 6', which is advantageously located in a different plane from the inlet opening 6' of the second cyclone separator 6b.

[0044] It is also advantageous for the plug 10 to define a separation wall that separates the aerosol flow destined for the first cyclone separator 6a from the aerosol flow destined for the second cyclone separator 6b. The separation wall extends primarily or exclusively in horizontal directions. Alternatively, a separate separation wall, distinct from the plug 10, is installed to separate the flow destined for the first cyclone separator 6a from the flow destined for the second cyclone separator 6b. The wall can be in the form of a washer, i.e., an annular piece to allow the passage of the aerosol flow into the first cyclone separator 6a. This configuration makes it possible to block an aerosol flow destined for the second separator 6b that has a significant vertical component when the flow is at the inlet of the first cyclone separator 6a.The central portion of the annular piece allows the oil-free gas flow to exit. The first cyclone separator 6a has an inlet 6' with a height identical or substantially identical to the height of the inlet 6' of the second cyclone separator 6b. The height is measured along the longitudinal direction of the cyclone separators 6.

[0045] To improve filtration quality, it is advantageous for the aerosol streams to have the smallest possible vertical component as they pass through the inlet openings 6' and throughout their path in the conveying channel 8. It is also advantageous for the aerosol streams to arrive at the highest possible velocity. The pipes 9 are preferably part of a distributor 11 that divides the incident aerosol stream passing through the inlet 4 into a plurality of streams destined for the plurality of cyclone separator groups 6. The pipes 9 allow for better direction of the aerosol streams.

[0046] To limit the vertical component, it is particularly advantageous to form channels 9 whose upper wall is parallel to the separation plane AA between the inlet openings 6' of the first and second cyclone separators and / or parallel to the upper wall of the conveying channel 8. It is also advantageous for the lower wall of the channels 9 to be parallel to the lower wall of the conveying channel 8, preferably coplanar. Throughout the aerosol's path along the channel 9, it is channeled to arrive opposite the inlet opening 7 and, more specifically, opposite the portion of the conveying channel 8 intended to feed the first cyclone separator 6a. The distributor 11 advantageously includes a containment plate 12 that is parallel or even coplanar with the upper face of the conveying channels 8.This configuration is particularly advantageous when the pipes are mobile and rotate, forming a fan that projects the aerosol.

[0047] It is possible that the distributor 11 defines two sets of pipes 9 which are separated by the containment plate 12. The first set of pipes 9 is opposite the first inlet ports 6' in horizontal directions, and the second set of pipes 9 is opposite the second inlet ports 6' in horizontal directions. The containment plate 12 is coplanar with the separation plane AA, close to the separation plane AA, or slightly higher than the separation plane AA.

[0048] It is particularly advantageous that the distributor 11 be spaced away from the separator 5. The separator 5 is annular in shape and the distributor 11 is positioned in the center of the ring and at a certain distance so as to allow a separation of the aerosol flow exiting the distributor 11 before passing through the inlet opening 7.

[0049] This embodiment is even more advantageous when the inner shape of the ring is substantially complementary to the outer shape of the distributor 11. Advantageously, the distributor 11 is circular, and the inner shape of the ring is also circular and slightly larger. In this case, it is preferable for the distributor 11 to be mounted to move relative to the separator 5. The distributor 11 rotates about a vertical axis of rotation that passes through the inlet 4. The rotation of the distributor 11 pushes the aerosol into the inlet openings 7 of the separator groups by cyclone effect 6.

[0050] In a preferred and illustrated mode of implementation figures 1 to 4 The separator 5 is annular in shape around the distributor 11. It is advantageous to fix the separator 5 to a lower dome 13 and to form a sealed connection between the separator 5 and the lower dome 13 in order to efficiently direct the aerosol flow towards the inlet openings 7. It is also advantageous to connect the separator 5 to an upper dome (not shown) in order to form a sealed receptacle around the distributor 11 so as to force the aerosol flow to escape through the inlet openings 7 to be filtered by the cyclone separators 6.

[0051] Each group of cyclone separators 6 has two nearest neighbors, a right group and a left group. Each group of cyclone separators 6 is attached to its two nearest neighbors to form a ring-shaped separator 5. For example, the attachment is achieved by screwing, clipping, inserting a rod, gluing, or any other suitable means.

[0052] In the illustrated configurations, each group of cyclone separators 6 defines a first mounting hole 14 and a second mounting hole 15. A screw, nut, or rod can be inserted into the first mounting hole 14 and the second mounting hole 15 to secure two adjacent groups of cyclone separators 6. It is advantageous for each group of cyclone separators 6 to also define a third mounting hole 16 for securing the group of cyclone separators 6 to the lower dome, for example, for the passage of a screw, nut, or rod. The third mounting hole 16 can be replaced by a male element that fits into a female element of the lower dome 13.

[0053] It is advantageous that each group of cyclone separators 6 be a single unit possibly closed by a plug 10 in order to facilitate the assembly and repairs of the separator 5 by replacing only the defective cyclone separator 6.

[0054] It is preferable that each group of cyclone separators 6 be fixed to the lower dome 13. The lower dome 13 may have a circular or substantially circular external shape. The lower dome 13 may also define an opening, preferably a central opening, for the formation of the inlet 4. Multiple groups of cyclone separators 6 are fixed to the lower dome 13 to form a watertight connection. Multiple groups of cyclone separators 6 are fixed to the upper dome to form a watertight connection.

[0055] The cyclone separator groups 6 are preferentially attached to their two nearest neighbors to provide greater structural stability. It is advantageous for each cyclone separator group 6 to have a male part 17 and a female part 18. The male part 17 of one cyclone separator group 6 is designed to be inserted into a female part 18 of an adjacent cyclone separator group 6. Inserting the male part 17 into the female part 18 ensures the seal of the separator 5.

[0056] This embodiment is particularly advantageous because it allows for the installation of a rotating, mobile distributor inside the separator 5, enabling the delivery of an aerosol with a high velocity while remaining compact and easy to manufacture. The multiple cyclone separators 6 are arranged around the distributor 11.

[0057] Preferably, the separator 5 is formed by a plurality of groups of cyclone separators 6 which are arranged removablely relative to each other. Each group of cyclone separators 6 can be detached from the others to replace a defective cyclone separator 6.

[0058] It is particularly advantageous that the groups of cyclone effect separators 6 be identical.

[0059] Preferably, the first cyclone separator 6a is positioned closer to the outlet of the feed channel 4 than the second cyclone separator 6b. This arrangement allows the first cyclone separator 6a to be fed before the second cyclone separator 6b, while maintaining good compactness and without compromising aerosol flow. This configuration is preferable to cyclone separators 6, all of which are equidistant from the inlet 4.

[0060] Advantageously, each group of cyclone separators 6 is provided with a conveying channel 8 that is straight or slightly curved. The radius of curvature of the conveying channel 8 is at least 50% greater than the radius of curvature of the pipes 9. Preferably, the radius of curvature is at least twice as large.

[0061] In the embodiment illustrated in figures 1, 2 And 3The radius of curvature of pipe 9 is opposite to the radius of curvature of the conveying channel 8. The assembly formed by pipe 9 and conveying channel 8 defines an inflection point. It is particularly advantageous for the inflection point to be located within the component that forms the cyclone separator group 6. Modifying the dimensions of the cyclone separators to accommodate an aerosol with different characteristics allows for adjustment of the position and configuration of the inflection point.

[0062] Preferably, the component forming the cyclone separator group 6 has an internal wall that defines the inlet opening 7. The internal wall is curved to follow the curvature of the pipe 9. This allows the aerosol flow to enter the cyclone separator group 6 with a lower pressure drop. The higher the velocity of the aerosol entering the separators, the more effective the cyclone separators 6 are at separating the carrier gas and the particles.

[0063] To achieve overall compactness, it is particularly advantageous to connect the filtration system directly to the outlet of a fan. For example, the filtration system can be attached to the impeller of a fan that delivers the aerosol. The filtration system is permanently mounted to the fan, allowing it to be in close proximity to the aerosol source. The aerosol is delivered at a high velocity, enabling efficient filtration. The fan can be a component of a machining center that sprays oil onto a workpiece; in other words, the fan is rotated by a motor in the machining center. Alternatively, the motor can be separate from the machining center, allowing the filtration system to be coupled to different machines. The machining center can also be replaced by another machine that produces aerosol.The oil is recovered using the filtration system for reuse. figure 3 illustrates a fan positioned in the center of the separator.

[0064] Even more favorably, the fan is installed between the lower dome 13 and the upper dome inside the separator 5 to supply the separator 5 with aerosol and reduce pressure losses.

[0065] In a particularly advantageous embodiment, the cyclone separator group 6 is formed as a single piece with a cap 10. The cyclone separator group 6 is made of polymer material and is preferably injection molded. The polymer piece defines the conveying channel 8 as well as the cyclone separators 6. It is therefore particularly economical to form a high-performance cyclone separator group 6 for separating air and oil from an oil mist.

[0066] The filtration of an oil mist and more generally of an aerosol is carried out by injecting the mist at the inlet of the filtration system 1. The oil mist stream is divided into a plurality of elementary streams by means of the pipes 9 which each feed a group of cyclone separators 6. Each group of cyclone separators 6 has its aerosol stream divided in order to feed each of the cyclone separators 6 which performs the filtration to extract the oil which exits through a dedicated outlet.

[0067] Although the implementation examples describe the separation of an oil mist, the separation system can be used to separate particles from an aerosol, the aerosol being able to contain particles in solid state and / or particles in liquid state.

Claims

1. A filtration system (1) for an aerosol containing a carrier gas and particles, comprising: - an inlet (4) for connection to a supply device configured to supply the aerosol; - a separator (5) configured to separate the carrier gas and the particles, the separator (5) comprising a plurality of cyclone separators (6) distributed in groups of cyclone separators (6), the groups of cyclone separators (6) being arranged side by side, each group of cyclone separators (6) having an inlet opening (7), at least one first cyclone separator (6a) and one second cyclone separator (6b), and a conveying channel (8) connecting the inlet opening (7) to each of the at least one first cyclone separator (6a) and one second cyclone separator (6b) for receiving the aerosol from the inlet ( 4); in which each first cyclone separator (6a) has an inlet opening (6') opening into the conveying channel (8) which is lower than an inlet opening (6') of each second cyclone separator (6b); characterized in that the groups of cyclone effect separators (6) are arranged next to each other in the form of a ring around the inlet (4).

2. Filtration system (1) according to claim 1 in which the separator (5) is fixed to a lower dome (13) and to an upper dome to form a sealed cavity, the lower dome (13) defining the inlet (4).

3. Filtration system (1) according to claim 2 in which a distributor (11) is disposed between the lower dome (13) and the upper dome inside the separator (5), the distributor (11) defining a plurality of channels (9) opposite the inlet openings (7) in horizontal directions.

4. Filtration system (1) according to claim 3 in which each channel (9) is curved to direct an aerosol flow from the inlet (4) to the inlet openings (7) of the separator (5), the curvature being observed in a direction perpendicular to a cutting plane which passes through all the cyclone separators (6).

5. Filtration system (1) according to any one of claims 3 and 4 in which the distributor (11) is mounted movable in rotation about a vertical axis of rotation passing through the inlet (4).

6. Filtration system (1) according to claim 5 in which the distributor (11) is a fan propelling the aerosol towards the inlet openings (7).

7. Filtration system (1) according to any one of claims 1 to 6 wherein the first cyclone separator (6a) is closer to the inlet (4) than the second cyclone separator (6b) in a vertical observation.

8. Filtration system (1) according to any one of claims 1 to 7 wherein the first cyclone separator (6a) is partially blocked by a first plug extending deeper than a second plug partially blocking the second cyclone separator (6b), the first plug blocking an upper part of the inlet mouth (6') to form a side wall of the conveying channel (8) towards the second cyclone separator (6b) and prevent the entry of aerosol.

9. Filtration system (1) according to any one of the preceding claims wherein each group of cyclone separators (6) is mounted removably from the other groups of cyclone separators (6).

10. Filtration system (1) according to claim 9 when it depends on claim 2 in which the cyclone separator groups (6) are arranged in the form of a circle around the inlet (4), the cyclone separator groups (6) being fixed to each other with a tight connection.

11. Filtration system (1) according to any one of claims 9 and 10 wherein the cyclone separator groups (6) define a male part and a female part, the male part of one of the cyclone separator groups (6) inserting into the female part of another adjacent cyclone separator group (6) to form the leak-proof connection.

12. Filtration process comprising the following steps: - providing a filtration system (1) according to any one of the preceding claims; - supplying the filtration system (1) with an aerosol; - recovering particles at the outlet of the separators by cyclone effect (6).

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