WO2022118205A1 - Machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like - Google Patents

Machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like Download PDF

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Publication number
WO2022118205A1
WO2022118205A1 PCT/IB2021/061162 IB2021061162W WO2022118205A1 WO 2022118205 A1 WO2022118205 A1 WO 2022118205A1 IB 2021061162 W IB2021061162 W IB 2021061162W WO 2022118205 A1 WO2022118205 A1 WO 2022118205A1
Authority
WO
WIPO (PCT)
Prior art keywords
filtration
machine
fact
sleeve
booth
Prior art date
Application number
PCT/IB2021/061162
Other languages
French (fr)
Inventor
Fabrizio FAEDO
Davide FERRI
Original Assignee
Progetto Energia S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Progetto Energia S.R.L. filed Critical Progetto Energia S.R.L.
Publication of WO2022118205A1 publication Critical patent/WO2022118205A1/en

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Classifications

    • 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
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • 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
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/04—Cleaning filters
    • 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
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/06—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material with means keeping the working surfaces flat
    • 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
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
    • B01D46/60—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel arranged concentrically or coaxially
    • 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
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

Definitions

  • the present invention relates to a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like.
  • impurities consist of particulate matter particles suspended in the air which must be separated from the same in order to purify it and, in particular, to make it compliant with the requirements of environmental and/or occupational safety regulations.
  • Air filtration machines are used, for example, in ceramic plants to trap ceramic dust and/or glaze residues suspended in the air, or in carpentry workshops to separate wood dust from the air itself.
  • sleeve filters are filtration devices with a tubular shape and made with special types of fabrics which can be crossed by air but not by particulate matter particles dispersed therein.
  • the filtering machines belonging to the above-mentioned type comprise a filtration booth inside which a plurality of vertically arranged sleeve filters is allocated.
  • the lower end of the sleeve filters is closed while the upper end of the same is open and is suspended from a supporting structure positioned at the top of the filtration booth and which separates the booth into a lower volume and an upper volume.
  • the filtration booth is provided with an inlet opening for the air to be filtered and an outlet opening for the filtered air, which are positioned at the lower and upper volume of the booth, respectively.
  • the air is pumped or sucked in so as to enter the lower volume, cross the outer surface of the sleeve filters and exit them through their upper ends, thus reaching the upper volume; the impurities are retained by the fabric of the sleeve filters, depositing at the outer surface of the same.
  • the known filtering machines are also provided with a cleaning assembly of the sleeve filters used to clean the outer surface of the filters themselves from the deposited impurities.
  • the cleaning assembly typically comprises blowing means which blow a pressurized gas, usually air, inside the sleeve filters and direct it in a downward direction, i.e., opposite to that of the air to be purified, so as to cross the sleeves from the upper volume to the lower volume.
  • blowing means which blow a pressurized gas, usually air, inside the sleeve filters and direct it in a downward direction, i.e., opposite to that of the air to be purified, so as to cross the sleeves from the upper volume to the lower volume.
  • This pressurized gas jet causes impurities to detach from the outer surface of the filters.
  • the impurities fall by gravity towards the bottom wall of the filtration chamber where they are subsequently removed.
  • the filtering machines comprise an anti-crushing cage inserted inside each sleeve filter and which supports the filter itself from the inside.
  • Patent document WO94/23824 describes a particular type of sleeve filters, commonly known as folded sleeve filters, which is a refinement of the conventional sleeve filters just described.
  • the folded sleeve filters have a larger filtering surface area than traditional sleeve filters, with the same overall volume of the filtration booth, since they comprise a tubular element made of a filtering fabric and folded internally on itself to define an outer sleeve and an inner sleeve.
  • the anti-crushing means with which the folded sleeve filters are provided comprise a first anti-crushing cage positioned inside the outer sleeve and a second anti-crushing cage positioned inside the inner sleeve.
  • the main aim of the present invention is to devise a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like, which makes it possible to simplify the construction process of the sleeve filters and, in particular, of the anti-crushing means, thus reducing their manufacturing costs.
  • Another object of the present invention is to devise a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like, which allows facilitating the cleaning phase of the sleeve filters by optimizing the obtainable level of cleanliness.
  • Another object of the present invention is to devise a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like, which allows the mentioned drawbacks of the prior art to be overcome within a simple, rational, easy and effective to use as well as affordable solution.
  • Figure 1 is an axonometric view of the machine according to the invention.
  • Figure 2 is an axonometric, cutaway and partially enlarged view of the machine according to the invention.
  • Figure 3 is a cross-sectional view of the machine according to the invention.
  • Figure 4 is a cross-sectional view of a machine component according to the invention.
  • reference numeral 1 globally indicates a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like.
  • the machine 1 comprises at least one filtration booth 2 of at least one gaseous mixture to be filtered.
  • the filtration booth 2 is provided with at least one inlet port 3 of the gaseous mixture and with at least one outlet port 4 of the filtered gaseous mixture.
  • the filtration booth 2 comprises an upper wall 5 having a substantially horizontal extension and a plurality of side walls 6 arranged transversely to the upper wall 5.
  • the filtration booth 2 comprises a plate- shaped element 7 having a substantially horizontal extension and arranged in the proximity of the upper wall 5.
  • the plate- shaped element 7 defines inside the filtration booth 2 a lower volume 8, at which the inlet port 3 is defined, and an upper volume 9 at which the outlet port 4 is defined.
  • the gaseous mixture to be filtered is air in which a plurality of particulate matter particles is dispersed to be separated from the same by means of the machine 1.
  • the machine 1 comprises at least one filtration assembly 10 of the gaseous mixture associated with the filtration booth 2 and comprising at least one sleeve filtration device 11 accommodated inside the filtration booth 2, arranged vertically and comprising at least one outer sleeve 12 and at least one inner sleeve 13 positioned inside the outer sleeve 12.
  • the sleeves 12, 13 comprise respective lower portions 12a, 13a connected to each other and respective upper portions 12b, 13b.
  • the filtration assembly 10 comprises a plurality of filtration devices 11 arranged side by side along a plurality of rows 14.
  • the filtration devices 11 are made of a particular type of fabric which is crossable by air but not by the particulate matter particles dispersed therein.
  • each filtration device 11 comprises a sock-shaped element folded over itself to define the inner sleeve 13 and the outer sleeve 12.
  • the lower portions 12a, 13a, of the sleeves 12, 13, and the upper portions 13b of the inner sleeves 13 are closed while the upper portions 12b of the outer sleeves 12 are open.
  • the plate-shaped element 7 comprises a plurality of through holes, and each through hole is associated with the upper portion 12b of an outer sleeve 12.
  • the filtration devices 11 are held by the plate- shaped element 7 and extend inside the lower volume 8.
  • the upper portions 12b of the outer sleeves 12, which are open, are connected to the upper volume 9 in a fluid- operated manner.
  • the gaseous mixture to be filtered is pumped or sucked inside the lower volume 8 passing through the inlet port 3 and crosses the thickness of the sleeves 12, 13 by moving from the outside the filtration devices 11 towards the inside of the same.
  • the particulate matter particles dispersed in the gaseous mixture are retained by the fabric of the sleeves 12, 13 and are deposited on the outer surface of the filtration devices 11.
  • the filtered gaseous mixture comes out of the upper portions 12b of the outer sleeves 12 entering the upper volume 9 and exiting the filtration booth 2 through the outlet port 4.
  • the construction material of the sleeves 12, 13 does not have a high degree of stiffness and therefore the sleeves 12, 13 may be crushed when crossed by the gaseous mixture.
  • the filtration assembly 10 comprises holding means 15 of the filtration devices 11 adapted to limit the pressing of the sleeves 12, 13 when crossed by the gaseous mixture.
  • the holding means 15 comprise: at least one supporting structure 16 positioned on top of the filtration devices 11 ; and at least one holding element 17 of the inner sleeves 13 associated with the supporting structure 16 and with the upper portions 13b of the inner sleeves 13, the inner sleeves 13 remaining suspended from the holding element 17.
  • the supporting structure 16 comprises at least one tubular element 18 extending in a substantially horizontal manner and positioned on top of the plate- shaped element 7.
  • the supporting structure 16 comprises a plurality of tubular elements 18 arranged side by side on a surface substantially parallel to the plate-shaped element 7.
  • Each tubular element 18 is positioned at a row 14 of the filtration devices 11.
  • the holding means 15 comprise a plurality of holding elements 17, each holding element 17 being associated with a relevant inner sleeve 13 so as to connect the relevant upper portion 13b to a respective tubular element 18.
  • each holding element 17 comprises at least one tie rod element positioned substantially vertically between the upper portion 13b of the inner sleeve 13 and the supporting structure 16.
  • each tie rod element is associated with the upper portion 13b of an inner sleeve 13 and the upper end of each tie rod element is associated with a tubular element 18.
  • the holding means 15 comprise a plurality of supporting elements 19 of the outer sleeves 12 positioned inside the outer sleeves 12 and extending longitudinally thereto.
  • the supporting elements 19 constitute a cage element having a substantially cylindrical conformation and extending coaxially to the outer sleeve 12 with which it is associated.
  • the supporting element 19 holds the outer sleeve 12 from the inside, thus limiting the crushing thereof when crossed by the gaseous mixture.
  • the particulate matter particles retained by the sleeves 12, 13 form a layer of dirt on the outer surface of the sleeves 12, 13 which has to be removed in order to improve the filtering efficiency of the filtration assembly 10.
  • the machine 1 comprises at least one cleaning assembly 20 of the filtration assembly 10, the cleaning assembly 20 being associated with the filtration booth 2 and being adapted to remove the dirt deposited on at least one outer surface of the sleeves 12, 13.
  • the cleaning assembly 20 comprises insufflation means 21 of at least one cleaning fluid adapted to blow the cleaning fluid inside the filtration devices 11 through the upper portions 12b of the outer sleeves 12.
  • the cleaning fluid at least partly flows out of the outer surface of the sleeves 12, 13 and removes the dirt deposited thereon.
  • the cleaning fluid is compressed air which is blown inside the filtration devices 11 in a downward direction, i.e., in an opposite direction to the direction according to which the gaseous mixture moves inside the filtration devices 11.
  • the insufflation means 21 are fluidly connected to the supply means of the cleaning fluid which have not been shown in the figures for simplicity’s sake and which, for example, are of the type of a compressor.
  • the insufflation means 21 comprise: at least one collector device 22 adapted to collect the cleaning fluid conveyed by the supply means; a plurality of distribution pipes 23 connected to the collector device 22 in a fluid- operated manner and adapted to distribute the collected cleaning fluid of the collector device 22 inside the filtration devices 11 ; valve means 24 connected to the collector device 22 and to the distribution pipes 23 in a fluid- operated manner and adapted to allow/prevent the fluidic communication between the collector device 22 and the distribution pipes 23.
  • each distribution pipe 23 comprises an end portion connected to a respective tubular element 18.
  • each tubular element 18 comprises a plurality of insufflation holes 30 formed at each filtration device 11 and adapted to convey the cleaning fluid inside the filtration devices 11 themselves.
  • the valve means 24 comprise a plurality of valve elements.
  • Each valve element is associated with the collector device 22 and with a distribution pipe 23 and is selectively positionable in the open position or in the closed position to allow/prevent the passage of the cleaning fluid from the collector device 22 to the reference distribution pipe 23.
  • the insufflation means 21 comprise a plurality of conveying devices 25 of the flow of the cleaning fluid adapted to convey the cleaning fluid exiting the insufflation holes 30 towards the filtration devices 11.
  • each conveying device 25 is mounted on the top of an upper portion 12b of an outer sleeve 12 and conveys the cleaning fluid coming out of the overlying insufflation hole 30 towards the inside of the underlying filtration device 11.
  • each conveying device 25 is of the Venturi type.
  • the conveying devices 25 promote homogeneous distribution of the cleaning fluid over the inner surfaces of the filtration devices 11.
  • the cleaning fluid tends to lap the inner surface of each conveying device 25 and, after exiting the same, maintains approximately the same trajectory, thus distributing itself homogeneously over the inner surface of the filtration device 11.
  • the conveying device 25 is adapted to create a vacuum inside the filtration device 11 which promotes the inlet of the surrounding air, thus improving the level of cleanliness obtained.
  • the insufflation means 21 comprise at least one directional element 26 of the flow of the cleaning fluid at inlet to the filtration devices 11.
  • the directional element 26 is adapted to direct the cleaning fluid towards the inner surface of the filtration devices 11.
  • the insufflation means 21 comprise a plurality of directional elements 26.
  • each directional element 26 is associated with the upper portion 13b of an inner sleeve 13 and has substantially ogival conformation.
  • the directional element 26 thanks to its special ogival conformation, diverts the cleaning fluid so that it laps the inner surface of the filtration devices 11 in order to homogeneously remove the dirt deposited on the outer surface of the sleeves 12, 13.
  • the cleaning assembly 20 comprises shaking means 27 of the filtration devices 11 comprising at least one actuator device 28 associated with the insufflation means 21 and operable by the blowing of the cleaning fluid inside the filtration devices 11.
  • the actuator device 28 is associated with the holding element 17 and is adapted to move it in a vibrating mode when operated.
  • the shaking means 27 comprise a plurality of actuator devices 28, and each actuator device 28 is associated with a respective holding element 17.
  • each actuator device 28 comprises at least one inflatable element 28.
  • the inflatable element 28 is positioned between the holding element 17 and the supporting structure 16, and the cleaning fluid expands the inflatable element 28 when blown inside the filtration device 11.
  • each inflatable element 28 comprises at least one bellow.
  • each inflatable element 28 is positioned on top of a tubular element 18 and aligned with a filtration device 11.
  • Each tubular element 18 comprises a plurality of inflation holes 31 formed at the installation location of the inflation elements 28.
  • the cleaning fluid When the cleaning fluid is insufflated inside the tubular element 18, thanks to the opening of the relevant valve means 24, it partly escapes from the insufflation holes 30, entering inside the filtration devices 11, and partly from the inflation holes 31, by expanding the inflatable elements 28.
  • the inflatable element 28 when the inflatable element 28 is expanded, it moves the holding element 17 upwards by moving it in a vibrating mode and promoting the detachment of the dirt deposited on the outer surface of the filtration devices 11. It is readily apparent that the fact of providing for synergistic operation of the insufflation means 21 and of the shaking means 27 promotes the removal of dirt from the filtration devices 11 quickly and easily.
  • the machine 1 comprises collecting means of the removed dirt 33 from the filtration devices 11 positioned below the filtration devices 11 themselves.
  • the filtration booth 2 comprises below an access opening to the lower volume 8 and a valve device 29 associated with the access opening in a fluid- operated manner and openable/closable in order to allow/prevent access to the lower volume 8 from the outside.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Abstract

The machine (1) comprises: - a filtration booth (2) for filtering a gaseous mixture to be filtered, provided with an inlet port (3) of the gaseous mixture and with an outlet port (4) of the filtered gaseous mixture; - a filtration assembly (10) of the gaseous mixture associated with the filtration booth (2) and comprising: - a sleeve filtration device (11) accommodated inside the filtration booth (2), arranged vertically and comprising an outer sleeve (12) and an inner sleeve (13) positioned inside the outer sleeve (12), wherein the sleeves (12, 13) comprise respective lower portions (12a, 13a) connected to each other and respective upper portions (12b, 13b); - holding means (15) of the filtration device (11) adapted to limit the pressing of the sleeves (12, 13) when crossed by the gaseous mixture.

Description

MACHINE FOR THE FILTRATION OF GASEOUS MIXTURES, PARTICULARLY AIR IN INDUSTRIAL ENVIRONMENTS OR THE LIKE
Technical Field
The present invention relates to a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like.
Background Art
The use is well known of machines for filtering the air coming out of particular production processes in order to retain any impurities contained therein and generated by the production processes themselves.
Usually, impurities consist of particulate matter particles suspended in the air which must be separated from the same in order to purify it and, in particular, to make it compliant with the requirements of environmental and/or occupational safety regulations.
Air filtration machines are used, for example, in ceramic plants to trap ceramic dust and/or glaze residues suspended in the air, or in carpentry workshops to separate wood dust from the air itself.
Various types of air filtering machines are known and, in the present disclosure, reference is made to machines provided with special filtration devices commonly known as sleeve filters.
Precisely, sleeve filters are filtration devices with a tubular shape and made with special types of fabrics which can be crossed by air but not by particulate matter particles dispersed therein.
Usually, the filtering machines belonging to the above-mentioned type comprise a filtration booth inside which a plurality of vertically arranged sleeve filters is allocated.
In detail, the lower end of the sleeve filters is closed while the upper end of the same is open and is suspended from a supporting structure positioned at the top of the filtration booth and which separates the booth into a lower volume and an upper volume.
The filtration booth is provided with an inlet opening for the air to be filtered and an outlet opening for the filtered air, which are positioned at the lower and upper volume of the booth, respectively.
The air is pumped or sucked in so as to enter the lower volume, cross the outer surface of the sleeve filters and exit them through their upper ends, thus reaching the upper volume; the impurities are retained by the fabric of the sleeve filters, depositing at the outer surface of the same.
The known filtering machines are also provided with a cleaning assembly of the sleeve filters used to clean the outer surface of the filters themselves from the deposited impurities.
The cleaning assembly typically comprises blowing means which blow a pressurized gas, usually air, inside the sleeve filters and direct it in a downward direction, i.e., opposite to that of the air to be purified, so as to cross the sleeves from the upper volume to the lower volume.
This pressurized gas jet causes impurities to detach from the outer surface of the filters.
The impurities fall by gravity towards the bottom wall of the filtration chamber where they are subsequently removed.
The above-mentioned filtering machines do have some drawbacks, among which the fact that the sleeve filters can partly collapse on themselves when hit by the flow of air to be filtered, since the material with which they are made is not particularly rigid and, therefore, can be crushed by the flow of air to be filtered.
To overcome, at least partly, this drawback, the filtering machines comprise an anti-crushing cage inserted inside each sleeve filter and which supports the filter itself from the inside.
However, the use of the above-mentioned anti-crushing cages is not without drawbacks, since their construction and their insertion inside the sleeve filters is not easy and quick.
Patent document WO94/23824 describes a particular type of sleeve filters, commonly known as folded sleeve filters, which is a refinement of the conventional sleeve filters just described.
Specifically, the folded sleeve filters have a larger filtering surface area than traditional sleeve filters, with the same overall volume of the filtration booth, since they comprise a tubular element made of a filtering fabric and folded internally on itself to define an outer sleeve and an inner sleeve.
The anti-crushing means with which the folded sleeve filters are provided comprise a first anti-crushing cage positioned inside the outer sleeve and a second anti-crushing cage positioned inside the inner sleeve.
It is easy to appreciate that the construction and the insertion of the anticrushing cages inside the folded sleeve filters is an even more complex operation than it is for the traditional filters.
This results in particularly high manufacturing costs, which makes the use of this type of filter inconvenient and limits its spreading on the market.
Additionally, the cleaning of folded sleeve filters is not always quick and easy to carry out and often does not achieve the desired level of cleanliness.
In this regard, it is necessary to point out that the particular conformation of the folded sleeve filters does not allow for the homogeneous distribution of the pressurized flow of air on the inner surface of the sleeve filter, thus causing a non-homogeneous removal of the impurities deposited externally which, sometimes, can jeopardize the abatement yield of the sleeve filters.
Description of the Invention
The main aim of the present invention is to devise a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like, which makes it possible to simplify the construction process of the sleeve filters and, in particular, of the anti-crushing means, thus reducing their manufacturing costs.
Another object of the present invention is to devise a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like, which allows facilitating the cleaning phase of the sleeve filters by optimizing the obtainable level of cleanliness.
Another object of the present invention is to devise a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like, which allows the mentioned drawbacks of the prior art to be overcome within a simple, rational, easy and effective to use as well as affordable solution.
The aforementioned objects are achieved by the machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like, having the characteristics of claim 1.
Brief Description of the Drawings
Other characteristics and advantages of the present invention will become more apparent from the description of a preferred, but not exclusive, embodiment of a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like, illustrated by way of an indicative, yet non-limiting example, in the accompanying tables of drawings wherein:
Figure 1 is an axonometric view of the machine according to the invention;
Figure 2 is an axonometric, cutaway and partially enlarged view of the machine according to the invention;
Figure 3 is a cross-sectional view of the machine according to the invention;
Figure 4 is a cross-sectional view of a machine component according to the invention.
Embodiments of the Invention
With particular reference to such figures, reference numeral 1 globally indicates a machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like.
The machine 1 comprises at least one filtration booth 2 of at least one gaseous mixture to be filtered.
The filtration booth 2 is provided with at least one inlet port 3 of the gaseous mixture and with at least one outlet port 4 of the filtered gaseous mixture.
The filtration booth 2 comprises an upper wall 5 having a substantially horizontal extension and a plurality of side walls 6 arranged transversely to the upper wall 5.
Internally, the filtration booth 2 comprises a plate- shaped element 7 having a substantially horizontal extension and arranged in the proximity of the upper wall 5.
The plate- shaped element 7 defines inside the filtration booth 2 a lower volume 8, at which the inlet port 3 is defined, and an upper volume 9 at which the outlet port 4 is defined.
Preferably, the gaseous mixture to be filtered is air in which a plurality of particulate matter particles is dispersed to be separated from the same by means of the machine 1.
Particularly, the machine 1 comprises at least one filtration assembly 10 of the gaseous mixture associated with the filtration booth 2 and comprising at least one sleeve filtration device 11 accommodated inside the filtration booth 2, arranged vertically and comprising at least one outer sleeve 12 and at least one inner sleeve 13 positioned inside the outer sleeve 12.
The sleeves 12, 13 comprise respective lower portions 12a, 13a connected to each other and respective upper portions 12b, 13b.
In the particular embodiment shown in the figures, the filtration assembly 10 comprises a plurality of filtration devices 11 arranged side by side along a plurality of rows 14.
The filtration devices 11 are made of a particular type of fabric which is crossable by air but not by the particulate matter particles dispersed therein.
Preferably, each filtration device 11 comprises a sock-shaped element folded over itself to define the inner sleeve 13 and the outer sleeve 12.
Particularly, the lower portions 12a, 13a, of the sleeves 12, 13, and the upper portions 13b of the inner sleeves 13 are closed while the upper portions 12b of the outer sleeves 12 are open.
Advantageously, the plate-shaped element 7 comprises a plurality of through holes, and each through hole is associated with the upper portion 12b of an outer sleeve 12.
In this way, the filtration devices 11 are held by the plate- shaped element 7 and extend inside the lower volume 8.
The upper portions 12b of the outer sleeves 12, which are open, are connected to the upper volume 9 in a fluid- operated manner.
In this way, the gaseous mixture to be filtered is pumped or sucked inside the lower volume 8 passing through the inlet port 3 and crosses the thickness of the sleeves 12, 13 by moving from the outside the filtration devices 11 towards the inside of the same.
At the same time, the particulate matter particles dispersed in the gaseous mixture are retained by the fabric of the sleeves 12, 13 and are deposited on the outer surface of the filtration devices 11.
Subsequently, the filtered gaseous mixture comes out of the upper portions 12b of the outer sleeves 12 entering the upper volume 9 and exiting the filtration booth 2 through the outlet port 4.
The construction material of the sleeves 12, 13 does not have a high degree of stiffness and therefore the sleeves 12, 13 may be crushed when crossed by the gaseous mixture.
In this regard, the filtration assembly 10 comprises holding means 15 of the filtration devices 11 adapted to limit the pressing of the sleeves 12, 13 when crossed by the gaseous mixture.
According to the invention, the holding means 15 comprise: at least one supporting structure 16 positioned on top of the filtration devices 11 ; and at least one holding element 17 of the inner sleeves 13 associated with the supporting structure 16 and with the upper portions 13b of the inner sleeves 13, the inner sleeves 13 remaining suspended from the holding element 17.
In the particular embodiment shown in the figures, the supporting structure 16 comprises at least one tubular element 18 extending in a substantially horizontal manner and positioned on top of the plate- shaped element 7.
In detail, the supporting structure 16 comprises a plurality of tubular elements 18 arranged side by side on a surface substantially parallel to the plate-shaped element 7.
Each tubular element 18 is positioned at a row 14 of the filtration devices 11.
Preferably, the holding means 15 comprise a plurality of holding elements 17, each holding element 17 being associated with a relevant inner sleeve 13 so as to connect the relevant upper portion 13b to a respective tubular element 18.
Conveniently, each holding element 17 comprises at least one tie rod element positioned substantially vertically between the upper portion 13b of the inner sleeve 13 and the supporting structure 16.
Particularly, the lower end of each tie rod element is associated with the upper portion 13b of an inner sleeve 13 and the upper end of each tie rod element is associated with a tubular element 18. Advantageously, the holding means 15 comprise a plurality of supporting elements 19 of the outer sleeves 12 positioned inside the outer sleeves 12 and extending longitudinally thereto.
In the particular embodiment shown in the figures, the supporting elements 19 constitute a cage element having a substantially cylindrical conformation and extending coaxially to the outer sleeve 12 with which it is associated.
The supporting element 19 holds the outer sleeve 12 from the inside, thus limiting the crushing thereof when crossed by the gaseous mixture.
The particulate matter particles retained by the sleeves 12, 13 form a layer of dirt on the outer surface of the sleeves 12, 13 which has to be removed in order to improve the filtering efficiency of the filtration assembly 10.
Advantageously, the machine 1 comprises at least one cleaning assembly 20 of the filtration assembly 10, the cleaning assembly 20 being associated with the filtration booth 2 and being adapted to remove the dirt deposited on at least one outer surface of the sleeves 12, 13.
The cleaning assembly 20 comprises insufflation means 21 of at least one cleaning fluid adapted to blow the cleaning fluid inside the filtration devices 11 through the upper portions 12b of the outer sleeves 12.
The cleaning fluid at least partly flows out of the outer surface of the sleeves 12, 13 and removes the dirt deposited thereon.
Preferably, the cleaning fluid is compressed air which is blown inside the filtration devices 11 in a downward direction, i.e., in an opposite direction to the direction according to which the gaseous mixture moves inside the filtration devices 11.
The insufflation means 21 are fluidly connected to the supply means of the cleaning fluid which have not been shown in the figures for simplicity’s sake and which, for example, are of the type of a compressor.
The insufflation means 21 comprise: at least one collector device 22 adapted to collect the cleaning fluid conveyed by the supply means; a plurality of distribution pipes 23 connected to the collector device 22 in a fluid- operated manner and adapted to distribute the collected cleaning fluid of the collector device 22 inside the filtration devices 11 ; valve means 24 connected to the collector device 22 and to the distribution pipes 23 in a fluid- operated manner and adapted to allow/prevent the fluidic communication between the collector device 22 and the distribution pipes 23.
In the particular embodiment shown in the figures, each distribution pipe 23 comprises an end portion connected to a respective tubular element 18.
Conveniently, each tubular element 18 comprises a plurality of insufflation holes 30 formed at each filtration device 11 and adapted to convey the cleaning fluid inside the filtration devices 11 themselves.
The valve means 24 comprise a plurality of valve elements.
Each valve element is associated with the collector device 22 and with a distribution pipe 23 and is selectively positionable in the open position or in the closed position to allow/prevent the passage of the cleaning fluid from the collector device 22 to the reference distribution pipe 23.
In this way, it is possible to simultaneously clean all the filtration devices 11 or to selectively clean the filtration devices 11 belonging to a particular row 14. Advantageously, the insufflation means 21 comprise a plurality of conveying devices 25 of the flow of the cleaning fluid adapted to convey the cleaning fluid exiting the insufflation holes 30 towards the filtration devices 11.
In the particular embodiment shown in the figures, each conveying device 25 is mounted on the top of an upper portion 12b of an outer sleeve 12 and conveys the cleaning fluid coming out of the overlying insufflation hole 30 towards the inside of the underlying filtration device 11.
In the particular embodiment shown in the figures, each conveying device 25 is of the Venturi type.
The conveying devices 25 promote homogeneous distribution of the cleaning fluid over the inner surfaces of the filtration devices 11.
In fact, thanks to the particular property of the fluids to follow the contour of a nearby surface, the cleaning fluid tends to lap the inner surface of each conveying device 25 and, after exiting the same, maintains approximately the same trajectory, thus distributing itself homogeneously over the inner surface of the filtration device 11.
Furthermore, the conveying device 25 is adapted to create a vacuum inside the filtration device 11 which promotes the inlet of the surrounding air, thus improving the level of cleanliness obtained.
Conveniently, the insufflation means 21 comprise at least one directional element 26 of the flow of the cleaning fluid at inlet to the filtration devices 11. The directional element 26 is adapted to direct the cleaning fluid towards the inner surface of the filtration devices 11.
In the particular embodiment shown in the figures, the insufflation means 21 comprise a plurality of directional elements 26.
Particularly, each directional element 26 is associated with the upper portion 13b of an inner sleeve 13 and has substantially ogival conformation.
The directional element 26, thanks to its special ogival conformation, diverts the cleaning fluid so that it laps the inner surface of the filtration devices 11 in order to homogeneously remove the dirt deposited on the outer surface of the sleeves 12, 13.
Advantageously, the cleaning assembly 20 comprises shaking means 27 of the filtration devices 11 comprising at least one actuator device 28 associated with the insufflation means 21 and operable by the blowing of the cleaning fluid inside the filtration devices 11.
The actuator device 28 is associated with the holding element 17 and is adapted to move it in a vibrating mode when operated.
The shaking means 27 comprise a plurality of actuator devices 28, and each actuator device 28 is associated with a respective holding element 17.
Preferably, each actuator device 28 comprises at least one inflatable element 28. The inflatable element 28 is positioned between the holding element 17 and the supporting structure 16, and the cleaning fluid expands the inflatable element 28 when blown inside the filtration device 11.
Conveniently, each inflatable element 28 comprises at least one bellow.
In the particular embodiment shown in the figures, each inflatable element 28 is positioned on top of a tubular element 18 and aligned with a filtration device 11. Each tubular element 18 comprises a plurality of inflation holes 31 formed at the installation location of the inflation elements 28.
When the cleaning fluid is insufflated inside the tubular element 18, thanks to the opening of the relevant valve means 24, it partly escapes from the insufflation holes 30, entering inside the filtration devices 11, and partly from the inflation holes 31, by expanding the inflatable elements 28.
In this way, when the inflatable element 28 is expanded, it moves the holding element 17 upwards by moving it in a vibrating mode and promoting the detachment of the dirt deposited on the outer surface of the filtration devices 11. It is readily apparent that the fact of providing for synergistic operation of the insufflation means 21 and of the shaking means 27 promotes the removal of dirt from the filtration devices 11 quickly and easily.
Conveniently, the machine 1 comprises collecting means of the removed dirt 33 from the filtration devices 11 positioned below the filtration devices 11 themselves. Particularly, the filtration booth 2 comprises below an access opening to the lower volume 8 and a valve device 29 associated with the access opening in a fluid- operated manner and openable/closable in order to allow/prevent access to the lower volume 8 from the outside.

Claims

1) Machine (1) for the filtration of gaseous mixtures, particularly air in industrial environments or the like, comprising: at least one filtration booth (2) for filtering at least one gaseous mixture to be filtered, said filtration booth (2) being provided with at least one inlet port (3) of said gaseous mixture and with at least one outlet port (4) of said filtered gaseous mixture; at least one filtration assembly (10) of said gaseous mixture associated with said filtration booth (2) and comprising: at least one sleeve filtration device (11) accommodated inside said filtration booth (2), arranged vertically and comprising at least one outer sleeve (12) and at least one inner sleeve (13) positioned inside said outer sleeve (12), wherein said sleeves (12, 13) comprise respective lower portions (12a, 13a) connected to each other and respective upper portions (12b, 13b); holding means (15) of said filtration device (11) adapted to limit the pressing of said sleeves (12, 13) when crossed by said gaseous mixture; characterized by the fact that said holding means (15) comprise: at least one supporting structure (16) positioned on top of said filtration device (11); and at least one holding element (17) of said inner sleeve (13) associated with said supporting structure (16) and with said upper portion (13b) of the inner sleeve (13), said inner sleeve (13) remaining suspended from said holding element (17).
2) Machine (1) according to claim 1, characterized by the fact that said holding element (17) comprises at least one tie rod element positioned substantially vertically between said upper portion (13b) of the inner sleeve (13) and said supporting structure (16).
3) Machine (1) according to one or more of the preceding claims, characterized by the fact that it comprises at least one cleaning assembly (20) of said filtration assembly (10), said cleaning assembly (20) being associated with said filtration booth (2) and being adapted to remove the dirt deposited on at least one outer surface of the sleeves (12, 13).
4) Machine (1) according to one or more of the preceding claims, characterized by the fact that said cleaning assembly (20) comprises insufflation means (21) of at least one cleaning fluid adapted to blow said cleaning fluid inside said filtration device (11) through said upper portion (12b) of said outer sleeve (12), said cleaning fluid at least partly flowing out of said outer surface of the sleeves (12, 13) and removing the dirt deposited thereon.
5) Machine (1) according to one or more of the preceding claims, characterized by the fact that said cleaning assembly (20) comprises shaking means (27) of said filtration device (11) comprising at least one actuator device (28) associated with said insufflation means (21) and operable by blowing said cleaning fluid inside said filtration device (11), said actuator device (28) being associated with said holding element (17) and being adapted to move it in a vibrating mode when operated.
6) Machine (1) according to one or more of the preceding claims, characterized by the fact that said actuator device (28) comprises at least one inflatable element (28), said inflatable element (28) being positioned between said holding element (17) and said supporting structure (16) and said cleaning fluid expanding said inflatable element (28) when blown inside said filtration device (11).
7) Machine (1) according to one or more of the preceding claims, characterized by the fact that said inflatable element (28) comprises at least one bellow.
8) Machine (1) according to one or more of the preceding claims, characterized by the fact that said insufflation means (21) comprise at least one directional element (26) of the flow of said cleaning fluid at inlet to said filtration device (11), said directional element (26) being adapted to direct said cleaning fluid towards the inner surface of said filtration device (11).
9) Machine (1) according to one or more of the preceding claims, characterized by the fact that said directional element (26) is associated with said upper portion (13b) of the inner sleeve (13) and has a substantially ogival conformation. 10) Machine (1) according to one or more of the preceding claims, characterized by the fact that said holding means (15) comprise at least one supporting element (19) of said outer sleeve (12) positioned inside said outer sleeve (12) and extending longitudinally thereto.
PCT/IB2021/061162 2020-12-02 2021-12-01 Machine for the filtration of gaseous mixtures, particularly air in industrial environments or the like WO2022118205A1 (en)

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Application Number Priority Date Filing Date Title
IT102020000029492A IT202000029492A1 (en) 2020-12-02 2020-12-02 MACHINE FOR FILTERING GAS MIXTURES, IN PARTICULAR AIR IN INDUSTRIAL OR SIMILAR ENVIRONMENTS
IT102020000029492 2020-12-02

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2014298A (en) * 1932-09-01 1935-09-10 Claude B Schneible Dust arrester
FR873744A (en) * 1941-03-04 1942-07-17 Sncase Improvements to filters with filtering walls for gasifiers
WO1994023824A1 (en) * 1993-04-21 1994-10-27 Huettlin Herbert Gas dusting filter cartridge
EP2047896A2 (en) * 2007-10-09 2009-04-15 Schuko H. Schulte-Südhoff GmbH Hose filter, supporting cage for same and hose filter assembly
CN101564626A (en) * 2008-04-21 2009-10-28 杨东明 Built-in cone type filter bag
KR101232252B1 (en) * 2012-09-19 2013-02-12 주식회사 마이크로원 Cone bag filter for dust collection facility

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2014298A (en) * 1932-09-01 1935-09-10 Claude B Schneible Dust arrester
FR873744A (en) * 1941-03-04 1942-07-17 Sncase Improvements to filters with filtering walls for gasifiers
WO1994023824A1 (en) * 1993-04-21 1994-10-27 Huettlin Herbert Gas dusting filter cartridge
EP2047896A2 (en) * 2007-10-09 2009-04-15 Schuko H. Schulte-Südhoff GmbH Hose filter, supporting cage for same and hose filter assembly
CN101564626A (en) * 2008-04-21 2009-10-28 杨东明 Built-in cone type filter bag
KR101232252B1 (en) * 2012-09-19 2013-02-12 주식회사 마이크로원 Cone bag filter for dust collection facility

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