WO2020121283A1 - Filtration device for the abatement of dust and/or particulate, for air sanitization and purification - Google Patents

Filtration device for the abatement of dust and/or particulate, for air sanitization and purification Download PDF

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Publication number
WO2020121283A1
WO2020121283A1 PCT/IB2019/060836 IB2019060836W WO2020121283A1 WO 2020121283 A1 WO2020121283 A1 WO 2020121283A1 IB 2019060836 W IB2019060836 W IB 2019060836W WO 2020121283 A1 WO2020121283 A1 WO 2020121283A1
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WO
WIPO (PCT)
Prior art keywords
filtration device
filtering
filter
box
shaped container
Prior art date
Application number
PCT/IB2019/060836
Other languages
French (fr)
Inventor
Giuseppe Ranieri
Gianni BARTOLINI
Marco ANGIOLONI
Original Assignee
Wiva Group S.P.A.
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 Wiva Group S.P.A. filed Critical Wiva Group S.P.A.
Priority to EP19836533.0A priority Critical patent/EP3894046A1/en
Publication of WO2020121283A1 publication Critical patent/WO2020121283A1/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
    • B01D46/24—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
    • B01D46/2418—Honeycomb filters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • 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
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames
    • B01D46/0009—Tray-like arrangements of filters in a vessel
    • 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
    • B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
    • 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
    • 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
    • B01D46/62—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 series
    • B01D46/64—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 series arranged concentrically or coaxially
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/88—Handling or mounting catalysts
    • B01D53/885—Devices in general for catalytic purification of waste gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/10—Apparatus features
    • A61L2209/14—Filtering means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/20—Method-related aspects
    • A61L2209/22—Treatment by sorption, e.g. absorption, adsorption, chemisorption, scrubbing, wet cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20707—Titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/91—Bacteria; Microorganisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/802—Visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2273/30—Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/65—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for the sterilisation of air
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides

Definitions

  • the invention relates to a filtration device for the abatement of dust and/or particulate, air sanitation and purification .
  • nanoparticles i.e. particles displaying one or more outer dimensions in the size range from 1 nm to 100 nm, are known.
  • coatings containing titanium dioxide (Ti0 2) nanoparticles are known to be excellent photocatalysts because they are capable of cleaning dirt and pathogens from the surfaces to which they are applied.
  • UV radiation ultraviolet
  • the arrangement of the light source orthogonally with respect to the air passage causes a considerable pressure drop and, therefore, a reduction in performance from an air exchange point of view, thereby reducing the overall flow rate of the system and thus, ultimately, reducing the number of times the same air passes through the filter.
  • the present invention thus aims at achieving the objects described above by means of a filtration device for the abatement of dust and/or particulate, air sanitization and purification, said device comprising at least one filtering cartridge provided with elements on the surface of which a photocatalyst is placed, which can be activated by visible light and further comprising organic or inorganic biocides, wherein said filtering cartridge is placed inside a box shaped container, said box-shaped container may be further associated with at least one light source configured to emit radiations in the visible spectrum and to irradiate and activate the aforesaid filtering cartridge.
  • nanomaterial chosen to coat the elements of the filtering cartridge is such that it can be activated by the visible light generated by the light source associated with the aforementioned filtration device.
  • the filtering elements of the filtering cartridge may be composed of different materials, e.g. ceramic, plastic, cardboard or others, and be made in different shapes, for example, but not exclusively, in form of honeycomb cells made of ceramic materials, spongy materials, lamellar materials, or materials made by 3D printing, etc.
  • the box-shaped container comprises a forced aeration assembly, configured to allow the air flow inside the filtration device.
  • An advantage of this embodiment is to allow, with an appropriate balance of speed impressed on the air, correct exposure of the air to the activated surface of the filter, in particular by causing appropriate turbulent movements.
  • the box-shaped container comprises a pre-filter adapted to cooperate with the aforesaid forced ventilation unit to pre-filter the air entering the box-shaped container, thereby avoiding the accumulation of dust and/or particulate on the filtering cartridge .
  • the coating comprises a photocatalyst which can be activated by visible light and further comprising organic or inorganic biocides.
  • the coating may also comprise titanium oxide (TiCy) .
  • the light source is made using LEDs.
  • the filter cartridges comprise a plurality of plastic sheets coated with a nanomaterial coating.
  • the filter cartridges comprise at least one filtering cell - preferably a plurality of filtering cells - of the honeycomb- type arranged at an angle to the main direction of air flow propagation .
  • An advantage of this solution is that it allows obtaining a very high luminous radiance without worsening the pressure drop of the filter at the same time.
  • the filter cartridge is advantageously replaceable in all models of the invention.
  • the invention further comprises a lighting system which consists of at least one filtration device as described above and further comprises a box-shaped body, provided with air inlet and outlet openings and also housing an LED panel.
  • the filter according to the present description works by means of a photocatalyst which can be activated by visible light and further comprises organic or inorganic biocides.
  • the aforesaid filter therefore, needs visible light to be activated .
  • the visible light to activate the aforesaid filtration device is emitted by optimizing two fundamental factors:
  • the objective is not simply to attempt to illuminate with high-energy values, but is, firstly, to illuminate with the best possible uniformity and, above all, without disturbing or worsening other parameters, such as the passage of air through the filtering system.
  • the light source is placed on the side of the air passage so that there is no pressure drop.
  • the invention therefore, allows creating a light chamber which ensures a very high light homogeneity.
  • This effect can be achieved by using highly reflective and highly diffusing materials for the construction of the box shaped container of the filter.
  • the high degree of diffusion allows the light to diffuse in all directions and ensures maximum uniformity of illuminance of the filter.
  • the invention allows making a catalyst filter comprising light chambers which ensure the right amount of light and, above all, the correct uniform illumination of the catalyst filter with visible light, thereby significantly improving the current operating mode which provides a front position of the light and, consequently, implies low homogeneity and a reduction in the air flow effectiveness.
  • the absolute value of the irradiance can be increased in two manners :
  • An inclination from 30° to 50° ensures excellent uniformity and an excellent compromise of pressure drop.
  • the 45° inclination is the optimum inclination.
  • the desired uniformity of incident light can be achieved in the following manners:
  • a possible embodiment of the present invention provides that the LED sources placed on the side of the filter have a system of secondary lenses above the light sources themselves, adapted to illuminate the filter itself directly and uniformly.
  • FIG. 3 is an axonometric section view of a filtration device according to the present invention.
  • FIG. 4 is a chart which illustrates various examples of filtering efficiency
  • FIG. 5 is a view from the top of a first embodiment of the filtration device of the invention with a vertical filtering cell;
  • FIG. 6 is a section view taken along section line C-C of the device shown in figure 5;
  • figure 7 is a partial section, axonometric view of the device illustrated in figure 5;
  • figure 8 is an axonometric view of a filtering element of the device shown in figure 5;
  • FIG. 9 is a view from the top of a second embodiment of the filtration device according to the invention with an inclined filtering cell;
  • FIG. 10 is a section view taken along section line A-A of the device shown in figure 9;
  • - figure 11 is a partial section, axonometric view of the device illustrated in figure 9;
  • - figure 12 is an axonometric view of a filtering element of the device shown in figure 9;
  • FIG. 13 is a view from the top of a third embodiment of the filtration device according to the invention with filtering cell with plastic sheets;
  • FIG. 14 is a section view taken along section line D-D of the device shown in figure 13;
  • figure 15 is a partial section, axonometric view of the device illustrated in figure 13;
  • FIG. 16 is an axonometric view of the filtration device provided by the invention which illustrates the replaceability of the filtering cartridges for possible maintenance and cleaning;
  • figure 17 is a side view of the filtration device shown in figure 16;
  • FIG. 18 is a view from the bottom of the lighting system according to an embodiment of the invention.
  • FIG. 19 is a section view taken along section line A-A of the lighting system shown in figure 18;
  • FIG. 20 is a section view taken along section line C-C of the lighting system shown in figure 18;
  • figure 21 is a view from the bottom of the system shown in figure 18;
  • FIG 22 is a partial section, axonometric view taken along section B-B of the system shown in figure 18;
  • figure 23 is an axonometric view of the system shown in figure 18 in a closed configuration
  • FIG. 24 is an axonometric view of the system shown in figure 18 in open configuration to allow, for example, possible maintenance of the filtering system;
  • figure 25 is a view from the top of the lighting system in figure 18 in a closed configuration
  • figure 26 is a view from the top of the lighting system shown in figure 18 in an open configuration.
  • FIG. 1 shows a filtering device for the abatement of dust and/or particulate, air sanitization and purification, indicated by the reference numeral 10.
  • Said device 10 may be in dual configuration (figure 1) or single configuration (figure 2) or in other configurations adapted for the purposes of the present invention.
  • Figure 3 is a further axonometric section view of a filtration device according to the present invention.
  • the device 10 comprises at least one filter cartridge 20 (three filter cartridges are shown in figure 3) .
  • a nanomaterial coating is placed on the surface of each filter cartridge 20 and each filter cartridge 10 is placed inside a box-shaped container 30.
  • the boxed-shaped container 30 can be associated with a light source 40, e.g. as described below in greater detail with reference to the lighting system 100, in which the light source 40 is configured to emit radiation in the visible spectrum to irradiate the aforesaid filter cartridge 20.
  • the light source 40 is obtained by means of LEDs .
  • the internal light is diffused and directed evenly to the filter cartridges 20 to allow optimal photocatalysis by the filter .
  • the internal multi-reflections allow a highly homogeneous light distribution.
  • a light irradiance of 80W/m 2 may be a preferred value for TiCy activation.
  • 7W LEDs with a luminous flux output of about 8001m can be used for each filter to obtain such preferred value.
  • the box-shaped container 30 comprises a forced aeration assembly 50, configured to allow the air flow inside the filtration device itself.
  • the forced ventilation unit 50 may comprise a fan, the purpose of which is to allow, with an appropriate balance of speed impressed on the air, correct exposure of the air to the activated surface of the filter, in particular by causing appropriate turbulent movements.
  • the box-shaped container 30 comprises a pre filter 60 adapted to cooperate with the aforesaid forced ventilation unit 50 to pre-filter the air entering the box shaped container 30, thereby avoiding the accumulation of dust and/or particulate on the filter cartridge 20.
  • the pre-filter 60 is used to reduce the dust and particulate matter (PM) present in the environment and is therefore used to clean the air and prevent the accumulation of dust on the internal filters.
  • the pre-filter 60 at the inlet of the device generates turbulences to obtain a speed of about 2m/s for the flow of air through the filter with the nanomaterial coating.
  • the pre-filter 60 is removable and changeable and can be made of fabric or non-woven fabric.
  • pre-filter filtration efficiency examples are shown in Table 1 below, in which the filtration percentage values are related to the size of the filtered particles.
  • the coating comprises a photocatalyst which can be activated by visible light and further comprises organic or inorganic biocides.
  • the coating may also comprise titanium oxide (Ti02) .
  • Figure 4 shows a chart illustrating various examples of filtration efficiency.
  • the volume of the air filtration chamber is 1 m 3 .
  • the initial NO concentration was 110 ⁇ 10 ppbv total NO x , obtained by mixing NO from a nitrogen cylinder (Siad, lot 200625-S0621654) .
  • the analysis was performed by chemiluminescence (Thermo, model 42i ) .
  • Figure 5 is a view from the top of a first embodiment of the filtration device of the invention.
  • the filtering cartridges 20 comprise a plurality of honeycomb- type cells (see also figures 6 and 7) .
  • Figure 8 shows an axonometric view of a filtering element of the device in figure 5.
  • Figure 9 is a view from the top of a second embodiment of the filtration device of the invention.
  • the filtration device 10 comprises filtering cartridges 20 of honeycomb-type with a parallelogram-shaped section and the main faces, i.e. the ones struck by the air flow, inclined with respect to the introduction direction of the air flow into the filter (see also figures 10 and 11) .
  • the light source is placed on the bottom of the filtration device and, in that position, it allows having no pressure drops on the air flow passing through the filter.
  • Figure 12 shows an axonometric view of a filter element of the device in figure 9, while figure 13 shows a view from the top of a third embodiment of the filtration device of the invention .
  • the filtering cartridges 20 comprise a plurality of sheets of transparent plastic material treated with a nanomaterial coating, said sheets being placed in horizontal layers in a higher position than the aforesaid light source 40 (see also figures 14 and 15) .
  • light sources can be placed above and below the filtering elements, so as to have a high luminous radiance on the individual transparent planes.
  • FIGS 16 and 17 are views of the filter device of the invention showing the replaceability of filter cartridges 20.
  • said filtering cartridges 20 are adapted to engage with appropriate seats 25.
  • Figure 18 shows a view from the bottom of the lighting system 100 according to an embodiment of the invention.
  • the lighting system 100 comprises at least one filtration device 10 as described above and further comprises a box-shaped body 120, provided with an LED lighting apparatus 130 and has air inlet (according to arrow FI) and outlet (according to arrow F2) openings .
  • Figures 19 and 20 show that a plurality of filtration devices 10 are comprised in the box-shaped body 120 of the lighting system 100.
  • Figure 22 also shows a power supply unit 140 for the lighting system 100.
  • the LED lighting apparatus 130 can be rotated by means of hinges 135, to allow the lighting system itself and the filter cartridges to be accessed.
  • Figure 25 is a view from the top of the lighting system 100 in which a honeycomb panel 150 is visible.

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Geometry (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Catalysts (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to a filtration device (10) for the abatement of dust and/or particulate, for air sanitization and purification, said device (10) comprising at least one filtering cartridge (20) provided with elements on the surface of which a coating is placed, comprising a photocatalyst which can be activated by visible light and further comprising organic or inorganic biocides, wherein said filtering cartridge (10) is placed inside a box-shaped container (30), said container (30) may be further associated with at least one light source (40) configured to emit radiations in the visible spectrum and to irradiate the aforesaid filtering cartridge (20).

Description

FILTRATION DEVICE FOR THE ABATEMENT OF DUST AND/OR PARTICULATE , FOR AIR SANITIZATION AND PURIFICATION
FIELD OF THE INVENTION
The invention relates to a filtration device for the abatement of dust and/or particulate, air sanitation and purification .
PRIOR ART
Several surface coatings made using nanoparticles, i.e. particles displaying one or more outer dimensions in the size range from 1 nm to 100 nm, are known.
For example, coatings containing titanium dioxide (Ti02) nanoparticles are known to be excellent photocatalysts because they are capable of cleaning dirt and pathogens from the surfaces to which they are applied.
However, the Ti02-based products currently on the market work using ultraviolet (UV) radiation to activate the photocatalysis process.
Devices are also known which require the use of lighting sources placed in front of a filtering element. This leads to high irradiance values but is regretfully accompanied by very low uniformity values.
Furthermore, the arrangement of the light source orthogonally with respect to the air passage causes a considerable pressure drop and, therefore, a reduction in performance from an air exchange point of view, thereby reducing the overall flow rate of the system and thus, ultimately, reducing the number of times the same air passes through the filter.
There are also solutions on the market in which LED lighting sources are placed in front of a ceramic honeycomb- type cell filter. However, again, in this case, the mutual arrangement of light sources and filter is not optimal, because very low percentages of surface area of the filtering surfaces are illuminated.
Further disadvantages of this known solution are the need to use high power fans due to the high pressure losses, which will produce a considerable noise level.
It is an object of the present invention to provide a filtration device which uses the coating of a photocatalyst which can be activated by visible light and which further comprises organic or inorganic biocides, on different substrates .
It is a further object of the present invention to provide a lighting system which offers filtering properties of the ambient air in which the system is installed.
BRIEF DESCRIPTION OF THE INVENTION
The present invention thus aims at achieving the objects described above by means of a filtration device for the abatement of dust and/or particulate, air sanitization and purification, said device comprising at least one filtering cartridge provided with elements on the surface of which a photocatalyst is placed, which can be activated by visible light and further comprising organic or inorganic biocides, wherein said filtering cartridge is placed inside a box shaped container, said box-shaped container may be further associated with at least one light source configured to emit radiations in the visible spectrum and to irradiate and activate the aforesaid filtering cartridge.
An advantage of such an embodiment is that the nanomaterial chosen to coat the elements of the filtering cartridge is such that it can be activated by the visible light generated by the light source associated with the aforementioned filtration device.
In particular, the filtering elements of the filtering cartridge may be composed of different materials, e.g. ceramic, plastic, cardboard or others, and be made in different shapes, for example, but not exclusively, in form of honeycomb cells made of ceramic materials, spongy materials, lamellar materials, or materials made by 3D printing, etc.
According to an embodiment of the invention, the box-shaped container comprises a forced aeration assembly, configured to allow the air flow inside the filtration device.
An advantage of this embodiment is to allow, with an appropriate balance of speed impressed on the air, correct exposure of the air to the activated surface of the filter, in particular by causing appropriate turbulent movements.
According to an embodiment of the invention, the box-shaped container comprises a pre-filter adapted to cooperate with the aforesaid forced ventilation unit to pre-filter the air entering the box-shaped container, thereby avoiding the accumulation of dust and/or particulate on the filtering cartridge .
According to an embodiment of the invention, the coating comprises a photocatalyst which can be activated by visible light and further comprising organic or inorganic biocides.
The coating may also comprise titanium oxide (TiCy) .
According to a further embodiment of the invention, the light source is made using LEDs.
According to an embodiment of the invention, the filter cartridges comprise a plurality of plastic sheets coated with a nanomaterial coating.
According to a further embodiment of the invention, the filter cartridges comprise at least one filtering cell - preferably a plurality of filtering cells - of the honeycomb- type arranged at an angle to the main direction of air flow propagation .
An advantage of this solution is that it allows obtaining a very high luminous radiance without worsening the pressure drop of the filter at the same time.
Moreover, the filter cartridge is advantageously replaceable in all models of the invention.
The invention further comprises a lighting system which consists of at least one filtration device as described above and further comprises a box-shaped body, provided with air inlet and outlet openings and also housing an LED panel.
The filter according to the present description works by means of a photocatalyst which can be activated by visible light and further comprises organic or inorganic biocides. The aforesaid filter, therefore, needs visible light to be activated .
According to the invention, the visible light to activate the aforesaid filtration device is emitted by optimizing two fundamental factors:
- the irradiance (the radiant flux incident on the surface) , so that the absolute value of the energy which reaches the surface is maximized;
- uniformity.
The objective is not simply to attempt to illuminate with high-energy values, but is, firstly, to illuminate with the best possible uniformity and, above all, without disturbing or worsening other parameters, such as the passage of air through the filtering system.
According to the present invention, the light source is placed on the side of the air passage so that there is no pressure drop.
The invention, therefore, allows creating a light chamber which ensures a very high light homogeneity.
This effect can be achieved by using highly reflective and highly diffusing materials for the construction of the box shaped container of the filter.
Materials with a diffusion coefficient close to 100% and with reflection coefficients close to 100% allow increasing the effectiveness of the device, ensuring excellent performance .
The high degree of diffusion allows the light to diffuse in all directions and ensures maximum uniformity of illuminance of the filter.
Basically, the invention allows making a catalyst filter comprising light chambers which ensure the right amount of light and, above all, the correct uniform illumination of the catalyst filter with visible light, thereby significantly improving the current operating mode which provides a front position of the light and, consequently, implies low homogeneity and a reduction in the air flow effectiveness.
The absolute value of the irradiance can be increased in two manners :
- by increasing the light power;
- by suitably tilting the filters inside the box-shaped housing, so that the light source is positioned perpendicularly to the filter itself.
An inclination from 30° to 50° ensures excellent uniformity and an excellent compromise of pressure drop. The 45° inclination is the optimum inclination.
The desired uniformity of incident light can be achieved in the following manners:
- by positioning the light source not in a front position, with respect to the filter and to the main direction of the air flow but in a side position, so as not to interfere with said air flow;
- by making light chambers in order to manage the light by means of internal multi-reflections which allow a high luminous homogeneity;
- by using secondary lenses, placed above the LED light sources, to direct the light evenly over the filter. Therefore, a possible embodiment of the present invention provides that the LED sources placed on the side of the filter have a system of secondary lenses above the light sources themselves, adapted to illuminate the filter itself directly and uniformly.
Further features of the invention can be inferred from the dependent claims.
BRIEF DESCRIPTION OF THE FIGURES
Further features and advantages of the invention will be more apparent in light of the following detailed description, with the aid of the accompanying drawings, in which:
- figures 1 and 2 show two different variant embodiments of the filtration device of the invention;
- figure 3 is an axonometric section view of a filtration device according to the present invention;
- figure 4 is a chart which illustrates various examples of filtering efficiency;
- figure 5 is a view from the top of a first embodiment of the filtration device of the invention with a vertical filtering cell;
- figure 6 is a section view taken along section line C-C of the device shown in figure 5;
- figure 7 is a partial section, axonometric view of the device illustrated in figure 5;
- figure 8 is an axonometric view of a filtering element of the device shown in figure 5;
- figure 9 is a view from the top of a second embodiment of the filtration device according to the invention with an inclined filtering cell;
- figure 10 is a section view taken along section line A-A of the device shown in figure 9;
- figure 11 is a partial section, axonometric view of the device illustrated in figure 9; - figure 12 is an axonometric view of a filtering element of the device shown in figure 9;
- figure 13 is a view from the top of a third embodiment of the filtration device according to the invention with filtering cell with plastic sheets;
- figure 14 is a section view taken along section line D-D of the device shown in figure 13;
- figure 15 is a partial section, axonometric view of the device illustrated in figure 13;
- figure 16 is an axonometric view of the filtration device provided by the invention which illustrates the replaceability of the filtering cartridges for possible maintenance and cleaning;
- figure 17 is a side view of the filtration device shown in figure 16;
- figure 18 is a view from the bottom of the lighting system according to an embodiment of the invention;
- figure 19 is a section view taken along section line A-A of the lighting system shown in figure 18;
- figure 20 is a section view taken along section line C-C of the lighting system shown in figure 18;
- figure 21 is a view from the bottom of the system shown in figure 18;
- figure 22 is a partial section, axonometric view taken along section B-B of the system shown in figure 18;
- figure 23 is an axonometric view of the system shown in figure 18 in a closed configuration;
- figure 24 is an axonometric view of the system shown in figure 18 in open configuration to allow, for example, possible maintenance of the filtering system;
- figure 25 is a view from the top of the lighting system in figure 18 in a closed configuration, and
- figure 26 is a view from the top of the lighting system shown in figure 18 in an open configuration.
The component parts of the apparatus according to the present description are shown in the drawings, where appropriate, with conventional symbols, showing only those specific details which are relevant to understanding the embodiments of the present invention, so as not to highlight details which will be immediately apparent, to those skilled in the art with reference to the description given herein. DETAILED DESCRIPTION OF SOME EMBODIMENTS OF THE PRESENT INVENTION
The invention will now be described with initial reference to figures 1 and 2, which show a filtering device for the abatement of dust and/or particulate, air sanitization and purification, indicated by the reference numeral 10.
Said device 10 may be in dual configuration (figure 1) or single configuration (figure 2) or in other configurations adapted for the purposes of the present invention.
Figure 3 is a further axonometric section view of a filtration device according to the present invention.
It shows that the device 10 comprises at least one filter cartridge 20 (three filter cartridges are shown in figure 3) .
A nanomaterial coating is placed on the surface of each filter cartridge 20 and each filter cartridge 10 is placed inside a box-shaped container 30.
The boxed-shaped container 30 can be associated with a light source 40, e.g. as described below in greater detail with reference to the lighting system 100, in which the light source 40 is configured to emit radiation in the visible spectrum to irradiate the aforesaid filter cartridge 20.
In particular, the light source 40 is obtained by means of LEDs .
The internal light is diffused and directed evenly to the filter cartridges 20 to allow optimal photocatalysis by the filter .
The use of highly diffusive materials allows maintaining a high degree of effectiveness following internal multi reflections .
The internal multi-reflections allow a highly homogeneous light distribution.
A light irradiance of 80W/m2 may be a preferred value for TiCy activation. For example, 7W LEDs with a luminous flux output of about 8001m can be used for each filter to obtain such preferred value.
In the filtration device 10, the box-shaped container 30 comprises a forced aeration assembly 50, configured to allow the air flow inside the filtration device itself.
The forced ventilation unit 50 may comprise a fan, the purpose of which is to allow, with an appropriate balance of speed impressed on the air, correct exposure of the air to the activated surface of the filter, in particular by causing appropriate turbulent movements.
Furthermore, the box-shaped container 30 comprises a pre filter 60 adapted to cooperate with the aforesaid forced ventilation unit 50 to pre-filter the air entering the box shaped container 30, thereby avoiding the accumulation of dust and/or particulate on the filter cartridge 20.
Therefore, the pre-filter 60 is used to reduce the dust and particulate matter (PM) present in the environment and is therefore used to clean the air and prevent the accumulation of dust on the internal filters.
The pre-filter 60 at the inlet of the device generates turbulences to obtain a speed of about 2m/s for the flow of air through the filter with the nanomaterial coating. The pre-filter 60 is removable and changeable and can be made of fabric or non-woven fabric.
Examples of pre-filter filtration efficiency are shown in Table 1 below, in which the filtration percentage values are related to the size of the filtered particles.
TABLE 1
Figure imgf000013_0001
As for filter cartridge 20, the coating comprises a photocatalyst which can be activated by visible light and further comprises organic or inorganic biocides.
The coating may also comprise titanium oxide (Ti02) .
Figure 4 shows a chart illustrating various examples of filtration efficiency.
The volume of the air filtration chamber is 1 m3.
The initial NO concentration was 110 ± 10 ppbv total NOx, obtained by mixing NO from a nitrogen cylinder (Siad, lot 200625-S0621654) .
The analysis was performed by chemiluminescence (Thermo, model 42i ) .
Figure 5 is a view from the top of a first embodiment of the filtration device of the invention.
In such an embodiment of the filtration device 10, the filtering cartridges 20 comprise a plurality of honeycomb- type cells (see also figures 6 and 7) .
Figure 8 shows an axonometric view of a filtering element of the device in figure 5.
Figure 9 is a view from the top of a second embodiment of the filtration device of the invention.
In such an embodiment, the filtration device 10 comprises filtering cartridges 20 of honeycomb-type with a parallelogram-shaped section and the main faces, i.e. the ones struck by the air flow, inclined with respect to the introduction direction of the air flow into the filter (see also figures 10 and 11) .
The light source is placed on the bottom of the filtration device and, in that position, it allows having no pressure drops on the air flow passing through the filter.
In this manner, it is possible to increase the irradiance value on the filter surface.
Figure 12 shows an axonometric view of a filter element of the device in figure 9, while figure 13 shows a view from the top of a third embodiment of the filtration device of the invention .
In this embodiment, the filtering cartridges 20 comprise a plurality of sheets of transparent plastic material treated with a nanomaterial coating, said sheets being placed in horizontal layers in a higher position than the aforesaid light source 40 (see also figures 14 and 15) .
In this case, light sources can be placed above and below the filtering elements, so as to have a high luminous radiance on the individual transparent planes.
Figures 16 and 17 are views of the filter device of the invention showing the replaceability of filter cartridges 20. In this case, said filtering cartridges 20 are adapted to engage with appropriate seats 25.
Figure 18 shows a view from the bottom of the lighting system 100 according to an embodiment of the invention.
With reference also to figures 19 and 20, the lighting system 100 comprises at least one filtration device 10 as described above and further comprises a box-shaped body 120, provided with an LED lighting apparatus 130 and has air inlet (according to arrow FI) and outlet (according to arrow F2) openings .
Figures 19 and 20 show that a plurality of filtration devices 10 are comprised in the box-shaped body 120 of the lighting system 100.
Figure 22 also shows a power supply unit 140 for the lighting system 100.
With reference to figure 24, in the lighting system 100, the LED lighting apparatus 130 can be rotated by means of hinges 135, to allow the lighting system itself and the filter cartridges to be accessed.
Figure 25 is a view from the top of the lighting system 100 in which a honeycomb panel 150 is visible.
Obviously, changes and improvements may be made to the invention as described without because of this departing from the scope of the invention, as claimed below.

Claims

1. A filtration device (10) for the abatement of dust and/or particulate, for air sanitization and purification, said device (10) comprising at least one filtering cartridge (20) provided with elements on the surface of which a nanomaterial coating is arranged, wherein said filtering cartridge (20) is placed inside a box-shaped container (30) provided with two openings and adapted to promote the transit of an air flow therein, through said two openings, said box shaped container (30) being further associated with at least one light source (40) configured to emit radiations in the visible spectrum and adapted to irradiate the aforesaid filtering cartridge (20) characterized in that said at least one light source (40) is arranged laterally with respect to the main direction of the air flow, in a position that does not interfere with said air flow.
2. A filtration device (10) according to claim 1, wherein the box-shaped container (30) comprises a forced aeration assembly (50), configured to increase the air flow inside the filtration device (10) .
3. A filtration device (10) according to one or more of claims 1 to 2, wherein the box-shaped container (30) comprises a pre-filter (60) adapted to cooperate with the aforesaid forced aeration assembly (50) adapted to pre-filter the incoming air into the box-shaped container (30), thus avoiding the accumulation of dust and/or particulate on the filtering cartridge (20) .
4. A filtration device (10) according to one or more of claims 1 to 3, wherein the nanomaterial coating comprises a photocatalyst which can be activated by visible light and further comprising organic or inorganic biocides.
5. A filtration device (10) according to one or more of claims 1 to 4, wherein the light source (40) consists of LEDs .
6. A filtration device (10) according to one or more of claims 1 to 5, wherein the filtering cartridges (20) comprise at least one honeycomb-type filtering cell.
7. A filtration device (10) according to one or more of claims 1 to 6, wherein the filtering cartridges (20) comprise a plurality of honeycomb-type filtering cells.
8. A filtration device (10) according to one or more of claims 1 to 7, wherein the filtering cartridges (20) are arranged in an inclined manner with respect to the main direction of the air flow propagation.
9. A filtration device (10) according to one or more of claims 1 to 5, wherein the filtering cartridges (20) comprise a plurality of sheets made of transparent plastic material treated with a nanomaterial coating, said sheets being placed according to horizontal layers in an upper and lower position with respect to the aforesaid light sources (40) .
10. A filtration device (10) according to one or more of claims 1 to 9, wherein said filtering cartridge (20) is replaceable .
11. A lighting system (100) comprising at least one filtration device (10) according to the preceding claims, characterized in that it comprises a box-shaped body (120), provided with a LED lighting apparatus (130) and provided with air inlet and outlet openings.
12. A lighting system (100) according to claim 11, wherein the LED lighting apparatus (130) can be rotated to allow the lighting system itself and the filter cartridges (20) to be accessed .
PCT/IB2019/060836 2018-12-14 2019-12-16 Filtration device for the abatement of dust and/or particulate, for air sanitization and purification WO2020121283A1 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
FR3122095A1 (en) * 2021-04-22 2022-10-28 Philippe Roux AIR TREATMENT AND PURIFICATION DEVICE BY PHOTOCATALYSIS

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WO2006100303A2 (en) * 2005-03-23 2006-09-28 Eco Armonia S.R.L. Lighting means and method for obtaining lighting means
EP2000208A2 (en) * 2006-03-30 2008-12-10 OSAKA Titanium Technologies Co., Ltd. Visible light response-type titanium oxide photocatalyst, method for manufacturing the visible light response-type titanium oxide photocatalyst, and use of the visible light response-type titanium oxide photocatalyst
WO2014003446A1 (en) * 2012-06-29 2014-01-03 Seoul Opto Device Co., Ltd. Apparatus for cleaning fluid
US20160097311A1 (en) * 2014-10-06 2016-04-07 Carlos Eduardo COELHO FERREIRA Filter

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Publication number Priority date Publication date Assignee Title
WO2006100303A2 (en) * 2005-03-23 2006-09-28 Eco Armonia S.R.L. Lighting means and method for obtaining lighting means
EP2000208A2 (en) * 2006-03-30 2008-12-10 OSAKA Titanium Technologies Co., Ltd. Visible light response-type titanium oxide photocatalyst, method for manufacturing the visible light response-type titanium oxide photocatalyst, and use of the visible light response-type titanium oxide photocatalyst
WO2014003446A1 (en) * 2012-06-29 2014-01-03 Seoul Opto Device Co., Ltd. Apparatus for cleaning fluid
US20160097311A1 (en) * 2014-10-06 2016-04-07 Carlos Eduardo COELHO FERREIRA Filter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3122095A1 (en) * 2021-04-22 2022-10-28 Philippe Roux AIR TREATMENT AND PURIFICATION DEVICE BY PHOTOCATALYSIS

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