CN217431301U - Filter element and filter device for separating oil vapour from a gas flow - Google Patents

Filter element and filter device for separating oil vapour from a gas flow Download PDF

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CN217431301U
CN217431301U CN202221358648.2U CN202221358648U CN217431301U CN 217431301 U CN217431301 U CN 217431301U CN 202221358648 U CN202221358648 U CN 202221358648U CN 217431301 U CN217431301 U CN 217431301U
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filter element
oil vapour
gas stream
separating oil
screen
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S·曼斯基
K·格里斯
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Atlas Copco Airpower NV
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0415—Beds in cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/104—Alumina
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/302—Dimensions
    • B01D2253/304—Linear dimensions, e.g. particle shape, diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Abstract

A filter element and filter arrangement for separating oil vapour from a gas stream, the filter element (9) comprising: a tubular outer screen (10) which is permeable to an air flow; and a tubular outer screen (13) which is permeable to the gas flow; the tubular outer screen and the tubular inner screen are on both ends contained in a first end cap (16) on the one hand and in a second end cap (17) on the other hand, such that an intermediate space (18) between the tubular outer screen (10) and the tubular inner screen (13) is sealed against gas flow over the first end cap (16) and the second end cap (17), the first end cap (16) and/or the second end cap (17) comprising openings (19) for placing the environment of the filter element (9) in fluid contact with an inner space (20) contained by the inner screen (13), characterized in that the intermediate space (18) is filled with a packed bed of oil vapour adsorbing particles (21), each having an effective particle diameter of 0.001mm to 1.5 mm.

Description

Filter element and filter device for separating oil vapour from a gas flow
Technical Field
The present invention relates to a filter element and a filter device for separating oil vapour from a gas stream.
As used herein, "oil vapor" refers to a carbonaceous component or group of carbonaceous components having a carbon number of 6 to 16.
More specifically, the present invention relates to a filter element comprising:
-a tubular outer screen permeable to the gas flow;
a tubular inner screen permeable to the gas flow in the inner space delimited by the inner surface of the outer screen,
the intermediate space between the outer and inner screens is filled with a packed bed of oil vapor adsorbing particles, almost all of which have an effective particle diameter of between 0.001mm and 1.5 mm.
As used herein, "effective particle diameter" refers to the diameter of a spherical particle having a volume corresponding to the volume of the oil vapor-adsorbing particle.
Background
Cylindrical filter elements for separating oil vapour from a gas stream are known in the prior art, which are completely filled with an oil vapour adsorption bed, the characteristic diameter of such cylindrical filter elements being smaller than the characteristic length of the cylindrical filter elements, and the gas stream flowing through the oil vapour adsorption bed in the axial direction of the cylindrical filter elements.
The oil vapor adsorbent bed typically comprises particles of an oil vapor adsorbent material, such as activated carbon. The shape of these particles may be regular, e.g. spherical or rod-like, or irregular. The characteristic size of such particles typically varies between 0.5mm and 5.0 mm.
The smaller the characteristic diameter of such a cylindrical filter element, the higher the flow rate of the gas stream through the oil vapor adsorption bed.
This flow rate results in a higher pressure drop across the oil vapor adsorption bed, typically between 50 mbar and 1000 mbar, and limits the adsorbent capacity of the oil vapor adsorption bed.
Therefore, to avoid such high pressure drop and adsorbent capacity limitations, the flow rate through the oil vapor adsorption bed must be limited to a value of typically 1.5 m/s.
Increasing the characteristic diameter of the filter element is generally not possible due to the space constraints imposed by the filter housing around the filter element.
It is also not possible to reduce the flow rate of the gas stream applied to a filter device having a filter element, since the flow rate is typically applied as a result of the gas stream flowing through the device upstream of the filter device.
Distributing the flow rate of the gas stream over additional filter elements connected in parallel in the filter device will imply additional costs for the filter elements and the piping and thus additional installation costs.
GB 1,096,989 describes a cylindrical adsorption unit for separating oil vapour from a gas stream, the unit consisting of an inner screen and an outer screen, the inner and outer screens being concentrically positioned relative to each other and contained between two end caps, the space between the inner screen, the outer screen and the end caps being filled with a porous adsorbent material (such as activated alumina or activated carbon).
The gas stream flows through the perforations in the outer screen, through the porous adsorbent material in a radial manner relative to the adsorbent unit, and finally exits the porous adsorbent material and flows through the perforations in the inner screen.
The radial flow of the gas stream through the porous adsorbent material reduces the flow rate of the gas stream through the porous adsorbent material relative to an adsorbent unit having the same dimensions, wherein the gas stream must flow axially through the porous adsorbent material.
As a result, the pressure drop across the porous adsorbent material will be significantly lower than in the case of a large adsorbent unit in which the gas stream flows axially.
Unfortunately, the relevant adsorption units are characterized by a limited adsorption capacity, as described in GB 1,096,989, page 3, lines 49-51.
The adsorption unit described in GB 1,096,989 is generally only able to separate 90 to 95% of the oil vapour (on a molar basis) from the gas stream.
In order to avoid high pressure drops across the oil vapor adsorption bed through which the gas stream flows axially, woven or non-woven filter media impregnated with oil vapor adsorbing particles have been developed, for example as described in US 3,149,023 or GB 1,265,098.
The woven or nonwoven filter media is typically wrapped in a cylindrical shape to create a filter media through which the gas stream flows radially.
However, a disadvantage of such filter media is that the total amount of oil vapor adsorbing material, which is proportional to the amount of oil vapor that can be removed from the gas stream, is much smaller than an oil vapor adsorbing bed of the same size, since only a small portion of the filter media is occupied by the oil vapor adsorbing material.
In addition, the wrapped filter media impregnated with oil vapor adsorbent bed particles is susceptible to damage, such as cracking, when overloaded. Such damage can create a bypass of airflow around the still intact filter media, along which the airflow can exit the filter element without adequately separating the oil vapor.
GB 2,109,268 describes a filter element having a filter medium through which a gas stream flows radially, the filter medium consisting of a combination of an inner tubular bed of packed activated carbon particles, around which a pleated paper medium impregnated with activated carbon particles is wrapped.
However, the use of such a combination leads to a complex layered structure and thus to a complex installation of the filter medium in the filter element.
In this case, there is also a disadvantage that the folded paper medium impregnated with activated carbon particles is easily damaged when overloaded.
Disclosure of Invention
The present disclosure is directed to addressing at least one of the foregoing and/or other disadvantages.
To this end, the invention relates to a filter element for separating oil vapour from a gas stream,
the filter element includes:
-a tubular outer screen permeable to the gas flow; and
-a tubular inner screen permeable to the gas flow in the inner space delimited by the inner surface of the outer screen;
the tubular outer screen and the tubular inner screen are contained at both ends in a first end cap on the one hand and in a second end cap on the other hand, so that the intermediate space between the tubular outer screen and the tubular inner screen is sealed against the gas flow over the first end cap and the second end cap,
the first end cap and/or the second end cap comprise openings for bringing the environment of the filter element into fluid contact with the inner space comprised by the tubular inner screen, characterized in that the aforementioned intermediate space is filled with a packed bed of oil vapour adsorbing particles, substantially all of which each have an effective particle diameter of between 0.001mm and 1.5 mm.
In this context, "packed" means that the intermediate space is almost completely filled by the packed bed, so that there is no bypass in the intermediate space around the packed bed for the gas flow through the intermediate space.
Herein, "oil vapor adsorbing particles" may refer to both particles that adsorb oil vapor and particles that adsorb oil vapor.
In this context, the word "substantially all of the oil vapor adsorbing particles each" means that all of the oil vapor adsorbing particles are considered individually. In other words, nearly all of the oil vapor adsorbing particles each have a potentially different effective particle diameter between 0.001mm and 1.5 mm.
The advantage of such a filter element according to the invention is that the pressure drop across the filter element is lower and the adsorbent capacity is higher compared to known filter elements of the same size which are completely filled with oil vapour adsorbing particles and which are to be flowed through axially by the gas flow.
In this case, it is very surprising that the saturation time and thus the lifetime of the filter element according to the invention can also be higher than in known filter elements which are completely filled with oil vapour adsorbing particles.
For the filter element according to the invention, the adsorption capacity of the filter element is also higher than for known filter elements of the same size, which will be radially flowed through by the gas flow and provided with a woven or non-woven wrapped filter medium impregnated with oil vapour adsorbing particles.
In this case, it is very surprising that the pressure drop across the filter element according to the invention can also be lower than in known filter elements which are radially flowed through by the gas stream and which are provided with a woven or non-woven wrapped filter medium impregnated with oil vapour adsorbing particles.
The packed bed of oil vapor-adsorbing particles is also less prone to rupture than filter elements having woven or non-woven wrapped filter media impregnated with oil vapor-adsorbing particles.
Preferably, substantially all of the oil vapour adsorbing particles each have an effective particle diameter of at least 0.01mm, preferably at least 0.1 mm.
Preferably, substantially all of the oil vapour adsorbing particles each have an effective particle diameter of at most 1.0mm, preferably at most 0.5 mm.
Preferably, more than 90% of the above particles each have an effective particle diameter between 0.1mm and 0.5 mm.
Preferably, the above-mentioned particles have an average effective particle diameter of between 0.15mm and 0.45 mm.
Preferably, the above-mentioned particles have a size of at least 800m 2 A/g, preferably at least 900m 2 In g, more preferably 1000m 2 Surface weight ratio of/g.
The greater the surface-to-weight ratio of the oil vapor adsorbing particles, the higher the adsorption capacity of the filter element.
Preferably, the above-mentioned granules have a mass of at least 400kg/m 3 Preferably at least 500kg/m 3 More preferably at least 600kg/m 3 Even more preferably at least 700kg/m 3 The bulk density of (2).
The greater the packing density of the oil vapor adsorbing particles, the higher the adsorption capacity of the filter element.
In a preferred embodiment of the filter element according to the invention, the particles comprise a carbonaceous porous material of natural or synthetic origin.
The carbonaceous porous material provides good bond strength with the separated oil vapor.
The carbonaceous porous material preferably comprises activated carbon.
Activated carbon can be obtained at low cost relative to other oil vapor adsorbing materials.
In another preferred embodiment of the filter element according to the invention, the tubular outer screen and/or the tubular inner screen comprise:
-a sintered polymer, preferably polypropylene, having pores configured such that the above-mentioned particles cannot pass through the pores; and/or
-a perforated metal, preferably stainless steel, having perforations configured such that the above-mentioned particles cannot pass through the perforations.
In a further preferred embodiment of the filter element according to the invention, the tubular outer screen and/or the tubular inner screen comprise an expanded material, which is laminated with a structured material, the holes in the structured material being configured such that the above-mentioned particles cannot pass through the holes.
Herein, "intumescent material" refers to a sheet-shaped material that is cut and stretched in such a way that it forms a grid with a regular pattern of perforations.
An advantage of sintered polymer and/or perforated metal or expanded material is that this makes the tubular outer screen and/or the tubular inner screen more rigid than the only nonwoven material typically used for tubular outer screens and/or tubular inner screens in existing filter elements.
This conventionally used nonwoven material will show some expansion over time and a significant deformation under the weight of the packed bed, as a result of which the volume of the intermediate space between the inner and outer tubular screens increases. As a result, over time, the intermediate space is no longer completely filled by the packed bed and a bypass can form in the intermediate space around the packed bed between the tubular inner screen and the tubular outer screen. Oil vapor can be carried by the gas stream via this bypass without being adsorbed into the packed bed.
Furthermore, such conventionally used nonwoven materials are more susceptible to damage, such as cracking, than sintered polymers and/or perforated metals or expanded materials (such as the materials of the present invention).
The structured material is preferably made of glass fibers.
Alternatively, the structured material is preferably a woven or non-woven polymeric media, preferably a polypropylene media.
In another preferred embodiment of the filter element according to the invention, the tubular inner screen and the tubular outer screen are axisymmetric and concentrically arranged with respect to each other.
In this case, the perpendicular distance between the inner surface of the tubular outer screen and the outer surface of the tubular inner screen is preferably at least 5.0mm, preferably at least 10.0mm, more preferably at least 20.0mm, even more preferably at least 30.0mm, still more preferably 40.0mm, and most preferably at least 50.0 mm.
The greater the vertical distance, the more oil vapor adsorbing material the filter element contains and, therefore, the longer the saturation time of the filter element will be.
The invention also relates to a filter device for separating oil vapour from an air flow, which is characterized in that the filter device is provided with a filter element according to the invention.
It goes without saying that such a filter device has the same advantages as the above-described embodiment of the filter element according to the invention.
Drawings
In order to better illustrate the features of the present invention, preferred embodiments of a filter element for separating oil vapour from a gas flow and a filter device provided with such a filter element according to the present invention are described herein, as an example without any limiting features, with reference to the accompanying drawings, in which:
fig. 1 is a cross-sectional view of a filter device provided with a filter element according to the invention.
Detailed Description
Fig. 1 shows a filter device 1 for separating oil vapour from a gas stream according to the invention.
The gas flow may be, for example, a compressed air flow, although the invention is not limited thereto.
The filter device 1 comprises a filter housing 2 consisting of a lid 3 and a tank 4, which can be mounted on top of each other to form the filter housing 2.
In the example shown, the can 4 is screwed into the cap 3, both the cap 3 and the can 4 being provided with cooperating threads 5.
Alternatively or additionally, it is not impossible for the can 4 to be attached in the lid 3 by a bayonet mounting and/or some other means.
The lid 3 is equipped with an inlet 6 for gas to be cleaned and an outlet 7 for cleaned gas. Typically, the filter device 1 with its cover 3 is installed in a machine pipe, such as a compressor installation. For this purpose, the cover 3 at the inlet 6 and the outlet 7 may be provided with flanges suitable for this purpose.
Furthermore, the cover 3 may be provided with a vent 8. Such vents 8 provide an audible alarm signal whenever the canister 4 is removed from the lid 3 while the interior of the filter housing 2 is still under pressure. Thus, the tank 4 can be completely unscrewed or detached from the cover 3 in a safe manner, i.e. only when the internal pressure in the filter housing 2 has been completely drained and has reached the same value as the pressure value in the external environment of the filter housing 2.
In the filter housing 2, more specifically in the tank 4, a filter element 9 is fitted.
The filter element 9 includes:
a tubular outer screen 10 which is permeable to gas flow, the outer screen 10 having a first outer screen end 11 and a second outer screen end 12 different from said first outer screen end 11;
a tubular inner screen 13 permeable to gas flow in an interior space defined by the inner surface of the outer screen 10, the inner screen 13 having a first inner screen end 14 and a second inner screen end 15 different from the first inner screen end 14;
a first end cap 16, a first outer screen end 11 and a first inner screen end 14 are accommodated in the first end cap 16 in such a way that they are sealed by the first end cap 16, and a second end cap 17, a second outer screen end 12 and a second inner screen end 15 are accommodated in the second end cap 17 in such a way that they are sealed by the second end cap 17, such that an intermediate space 18 between the outer screen 10 and the inner screen 13 is sealed against an air flow over the first end cap 16 and the second end cap 17, the second end cap 17 comprising an opening 19 configured such that an inner space 20 comprised by the inner screen 13 and the first end cap 16 is placed in fluid contact with the environment of the filter element 9 along said opening 19.
It is not excluded within the scope of the invention that the first end cap 16 is also provided with an opening 19 or that only the end cap 16 is provided with an opening.
The intermediate space 18 is filled with a packed bed of oil vapour adsorbing particles, almost all of the oil vapour adsorbing particles 21 each having an effective particle diameter between 0.001mm and 1.5 mm.
Preferably, more than 90% of the particles 21 each have an effective particle diameter between 0.1mm and 0.5 mm.
Preferably, the particles 21 have an average effective particle diameter of between 0.15mm and 0.45 mm.
Furthermore, the particles 21 preferably have a size of at least 800m 2 Surface weight ratio of/g.
The granules 21 preferably have a mass of at least 400kg/m 3 The bulk density of (2).
Preferably, but not necessarily according to the invention, the aforementioned particles 21 comprise a carbonaceous porous material of natural or synthetic origin, preferably activated carbon.
The outer screen 10 and/or the inner screen 13 comprise:
sintered polymer, preferably polypropylene, having pores small enough not to allow the particles 21 to pass through; and/or
Perforated metal, preferably stainless steel, with perforations small enough to not allow the particles 21 to pass through.
Alternatively or additionally, the outer screen 10 and/or the inner screen 13 comprise an expanded material laminated with a structured material, the pores in the structured material being so small that the particles 21 cannot pass through.
The structured material is preferably made of fiberglass or a woven or non-woven polymeric media, preferably a polypropylene media.
In this case, the inner screen 13 and the outer screen 10 are axisymmetric and concentrically arranged with respect to each other.
In this case, the vertical distance between the inner surface of the outer screen 10 and the outer surface of the inner screen 13 is preferably at least 5.0 mm.
A filter device 1 with a filter element 9 for separating oil vapour from a gas flow having an oil vapour concentration of at least 0.25mg oil vapour/m 3 Gas, preferably at least 0.30mg oil vapour/m 3 Gas, more preferably at least 0.35mg oil vapour/m 3 Gas, even more preferably at least 0.40mg oil vapour/m 3 Gas, still more preferably at least 0.45mg oil vapor/m 3 A gas.
Furthermore, the filter device 1 with the filter element 9 serves for separating oil vapour from a gas stream to at most 0.010mg oil vapour/m 3 Gas, preferably at most 0.005mg oil vapour/m 3 Gas, more preferably at most 0.003mg oil vapour/m 3 Oil vapor concentration of the gas.
Comparative example:
various known filter devices having a filter medium for separating oil vapor in a conventional compressor installation, upstream of the filter device for separating oil vapor, the compressor installation having:
-an oil-injected compressor for compressing gas;
-a cooling dryer for separating water vapour from the compressed gas; and
-a coalescing filter for separating oil aerosol having a carbon number greater than 16.
In this case, the inlet concentration of oil vapor in the gas entering the filter device for separating oil vapor is maintained at 0.5mg oil vapor/m 3 Concentration of gas.
The pressure and temperature of the gas entering the filter device were 7 bar and 0 to 35 c, respectively.
The pressure drop across the filter device, the initial breakthrough concentration of the oil vapor, and the time required to achieve 50% breakthrough in the relevant filter media are listed in table 1 for the various filter media known.
In this case, the "initial breakthrough concentration" refers to the concentration of oil vapor initially present in the gas exiting the filter medium that is still unsaturated.
The lower the initial breakthrough concentration, the higher the initial performance of the filter device.
In this case, "50% breakthrough" means that the oil vapor concentration present in the gas exiting the filter medium is 50% of the inlet concentration of the oil vapor.
As is clear from the data in table 1, in the wrapped filter media impregnated with oil vapor adsorbing particles, the pressure drop across the filter device is lower relative to filter media designed as a fully packed bed.
In addition, wrapped filter media is generally found to have a lower initial breakthrough concentration, and in some cases a longer time to 50% breakthrough, than filter media designed as a fully packed bed.
It can thus be concluded that filter devices with wrapped filter media generally have a higher level of performance in terms of pressure drop and initial breakthrough concentration, and in some cases even longer saturation times and thus longer lifetimes, than filter devices with filter media designed as fully packed beds.
Figure DEST_PATH_GDA0003714241120000101
Figure DEST_PATH_GDA0003714241120000111
TABLE 1
Example (c):
a filter device having a filter element according to the present invention was tested under the same conditions as the above comparative example.
The filter element comprises two concentric cylindrical screens made of sintered polypropylene, the intermediate space between said screens being filled with a packed bed of activated carbon particles.
The active carbon particles have an effective particle diameter of between 0.001mm and 1.5mm, more than 90% of the active carbon particles have an effective particle diameter of between 0.1mm and 0.315mm, and the active carbon particles have an average effective particle diameter of 0.21 mm.
The activated carbon particles had a particle size of 735kg/m 3 (iii) bulk density of 1050m 2 Surface weight ratio of/g.
According to the utility model, the pressure drop of the two sides of the filter device is only 75mbar, and the initial penetration concentration is lower than 0.003mg/m 3 And the time required to achieve 50% penetration exceeds 100 hours.
It can thus be concluded that the filter device according to the invention is generally comparable to the filter device described above as a comparative example
-having a higher performance level, i.e. a lower initial penetration concentration, relative to the initial penetration concentration; and
have a longer saturation time and therefore a longer lifetime.
In most cases, the pressure drop across the filter device according to the invention is also lower than the pressure drop across the filter device described above as a comparative example.
It should be noted here in particular that the filter device according to the invention has a higher performance level in terms of pressure drop, initial breakthrough concentration, saturation time/life than the comparative example of a filter device with filter media designed as a fully packed bed.
The invention is in no way limited to the embodiments described as examples and shown in the drawings, but the filter device according to the invention can be realized in all shapes and sizes without exceeding the scope of the invention as defined in the claims.

Claims (31)

1. A filter element for separating oil vapor from a gas stream,
the filter element (9) comprises:
-a tubular outer screen (10) permeable to the gas flow; and
-a tubular inner screen (13) permeable to the gas flow in an inner space delimited by the inner surface of the tubular outer screen (10);
both ends of the tubular outer screen (10) and the tubular inner screen (13) are contained in a first end cap (16) on the one hand and a second end cap (17) on the other hand, such that an intermediate space (18) between the tubular outer screen (10) and the tubular inner screen (13) is sealed against gas flow over the first end cap (16) and the second end cap (17), the first end cap (16) and/or the second end cap (17) comprising openings (19) for placing the environment of the filter element (9) in fluid contact with an inner space (20) contained by the tubular inner screen (13),
characterized in that the above-mentioned intermediate space (18) is filled with a packed bed of oil vapour adsorbing particles (21), almost all of the oil vapour adsorbing particles (21) each having an effective particle diameter between 0.001mm and 1.5 mm.
2. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that almost all oil vapour adsorbing particles (21) each have an effective particle diameter of at least 0.01 mm.
3. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that almost all oil vapour adsorbing particles (21) each have an effective particle diameter of at least 0.1 mm.
4. A filter element for separating oil vapour from a gas stream according to claim 1 or 2 or 3, characterised in that almost all oil vapour adsorbing particles (21) each have an effective particle diameter of at most 1.0 mm.
5. A filter element for separating oil vapour from a gas stream according to claim 1 or 2 or 3, characterised in that almost all oil vapour adsorbing particles (21) each have an effective particle diameter of at most 0.5 mm.
6. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that more than 90% of the above-mentioned oil vapour adsorbing particles (21) each have an effective particle diameter between 0.1mm and 0.5 mm.
7. A filter element for separating oil vapour from a gas stream according to claim 1 or 6, characterised in that the oil vapour adsorbing particles (21) have an average effective particle diameter of between 0.15mm and 0.45 mm.
8. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the surface weight ratio of the oil vapour adsorbing particles (21) is at least 800m 2 /g。
9. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the surface weight ratio of the oil vapour adsorbing particles (21) is at least 900m 2 /g。
10. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the surface weight ratio of the oil vapour adsorbing particles (21) is at least 1000m 2 /g。
11. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the bulk density of the oil vapour adsorbing particles (21) is at least 400kg/m 3 。
12. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the bulk density of the oil vapour adsorbing particles (21) is at least 500kg/m 3 。
13. A filter element for separating oil vapor from a gas stream as set forth in claim 1 wherein said oil vapor adsorbent particles(21) Has a bulk density of at least 600kg/m 3 。
14. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the bulk density of the oil vapour adsorbing particles (21) is at least 700kg/m 3 。
15. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the oil vapour adsorbing particles (21) comprise a carbonaceous porous material of natural or synthetic origin.
16. The filter element for separating oil vapor from a gas stream of claim 15, wherein the carbonaceous porous material comprises activated carbon.
17. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the tubular outer screen (10) and/or the tubular inner screen (13) comprises:
-a sintered polymer having pores configured in such a way that the above-mentioned oil vapour adsorbing particles (21) cannot pass through said pores; and/or
-perforated metal having perforations arranged in such a way that the above-mentioned oil vapour adsorbing particles (21) cannot pass through the perforations.
18. A filter element for separating oil vapor from a gas stream as recited in claim 17, wherein the sintered polymer is sintered polypropylene.
19. A filter element for separating oil vapor from a gas stream as recited in claim 17, wherein the perforated metal is perforated stainless steel.
20. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the tubular outer screen (10) and/or the tubular inner screen (13) comprises an expanded material laminated with a structured material, the holes in the structured material being arranged in such a way that the aforementioned oil vapour adsorbing particles (21) cannot pass through the holes in the structured material.
21. The filter element for separating oil vapor from a gas stream of claim 20, wherein the structured material is made of fiberglass.
22. A filter element for separating oil vapor from a gas stream as recited in claim 20, wherein the structured material is a woven or non-woven polymeric media.
23. A filter element for separating oil vapor from a gas stream as recited in claim 22, wherein the woven or nonwoven polymeric media is a polypropylene media.
24. A filter element for separating oil vapour from a gas stream according to claim 1, characterised in that the tubular inner screen (13) and the tubular outer screen (10) are axisymmetric and concentrically arranged with respect to each other.
25. A filter element for separating oil vapour from a gas stream according to claim 24, characterised in that the vertical distance between the inner surface of the tubular outer screen (10) and the outer surface of the tubular inner screen (13) is at least 5.0 mm.
26. A filter element for separating oil vapour from a gas stream according to claim 24, characterised in that the vertical distance between the inner surface of the tubular outer screen (10) and the outer surface of the tubular inner screen (13) is at least 10.0 mm.
27. A filter element for separating oil vapour from a gas stream according to claim 24, characterised in that the vertical distance between the inner surface of the tubular outer screen (10) and the outer surface of the tubular inner screen (13) is at least 20.0 mm.
28. A filter element for separating oil vapour from a gas stream according to claim 24, characterised in that the vertical distance between the inner surface of the tubular outer screen (10) and the outer surface of the tubular inner screen (13) is at least 30.0 mm.
29. A filter element for separating oil vapour from a gas stream according to claim 24, characterised in that the vertical distance between the inner surface of the tubular outer screen (10) and the outer surface of the tubular inner screen (13) is at least 40.0 mm.
30. A filter element for separating oil vapour from a gas stream according to claim 24, characterised in that the vertical distance between the inner surface of the tubular outer screen (10) and the outer surface of the tubular inner screen (13) is at least 50.0 mm.
31. A filter device for separating oil vapour from a gas flow, characterised in that the filter device (1) is provided with a filter element (9) according to any one of the preceding claims 1 to 30.
CN202221358648.2U 2021-06-01 2022-06-01 Filter element and filter device for separating oil vapour from a gas flow Active CN217431301U (en)

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BEBE2021/5438 2021-06-01
BE20215438A BE1029447B1 (en) 2021-06-01 2021-06-01 FILTER ELEMENT FOR SEPARATING OIL VAPOR FROM A GAS FLOW AND METHOD FOR MANUFACTURING SUCH FILTER ELEMENT

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BE (1) BE1029447B1 (en)
DE (1) DE202022103046U1 (en)
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US3149023A (en) 1961-07-19 1964-09-15 C H Dexter & Sons Inc Carbon-filled sheet and method for its manufacture
GB1096989A (en) 1966-12-02 1967-12-29 Mc Graw Edison Co Fluid separator
BE759622A (en) 1969-12-01 1971-06-01 Dow Corning COPOLYMER SEQUENCES OF SILOXANES, VULCANIZABLE AT ROOM TEMPERATURE, CONTAINING POLYDIORGANOSILOXANE SEQUENCES OF DIFFERENT LENGTHS
GB2109268B (en) 1981-11-16 1984-10-03 Process Scient Innovations Gas purifiers
EP0159697A3 (en) * 1984-04-27 1987-01-14 Pall Corporation Gas mask canister
US5139543A (en) * 1991-02-22 1992-08-18 Sowinski Richard F Method for filtering benz-a-anthracene from a gas stream
PL3903906T3 (en) * 2012-07-11 2024-01-03 Mann+Hummel Gmbh Method for cleaning air
DE102013021071A1 (en) * 2013-12-18 2015-06-18 Mann + Hummel Gmbh Filter medium, filter element and filter assembly

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BE1029447A1 (en) 2023-01-03
IE20220092U1 (en) 2022-12-07
IES87358Y1 (en) 2023-01-04
DE202022103046U1 (en) 2022-06-29
TR2022008594U5 (en) 2022-08-22
JP3238625U (en) 2022-08-05

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