WO2016193533A1 - Air filter for grease filtering - Google Patents

Air filter for grease filtering Download PDF

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Publication number
WO2016193533A1
WO2016193533A1 PCT/FI2016/050355 FI2016050355W WO2016193533A1 WO 2016193533 A1 WO2016193533 A1 WO 2016193533A1 FI 2016050355 W FI2016050355 W FI 2016050355W WO 2016193533 A1 WO2016193533 A1 WO 2016193533A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
mounting element
air
source
light
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/FI2016/050355
Other languages
French (fr)
Inventor
Seppo Vartiainen
Jyrki HÄMÄLÄINEN
Karna DAHAL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jeven Oy
Original Assignee
Jeven Oy
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 Jeven Oy filed Critical Jeven Oy
Priority to PL16802630.0T priority Critical patent/PL3303934T3/en
Priority to KR1020177034299A priority patent/KR102549299B1/en
Priority to EP16802630.0A priority patent/EP3303934B1/en
Priority to RU2017142082A priority patent/RU2709942C2/en
Priority to US15/577,566 priority patent/US11248805B2/en
Priority to CA2987679A priority patent/CA2987679C/en
Publication of WO2016193533A1 publication Critical patent/WO2016193533A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
    • B01D46/0031—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid with collecting, draining means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2042—Devices for removing cooking fumes structurally associated with a cooking range e.g. downdraft
    • F24C15/205—Devices for removing cooking fumes structurally associated with a cooking range e.g. downdraft with means for oxidation of cooking fumes
    • 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
    • A61L9/20—Ultraviolet radiation
    • A61L9/205—Ultraviolet radiation using a photocatalyst or photosensitiser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/14—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by rotating vanes, discs, drums or brushes
    • 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
    • B01D46/0052—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with filtering elements moving during filtering operation
    • B01D46/0056—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with filtering elements moving during filtering operation with rotational movement
    • 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
    • B01D46/80—Chemical processes for the removal of the retained particles, e.g. by burning
    • B01D46/82—Chemical processes for the removal of the retained particles, e.g. by burning with catalysts
    • 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
    • B01D53/8678—Removing components of undefined structure
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/063—Titanium; Oxides or hydroxides thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
    • B01J27/053—Sulfates
    • B01J27/055—Sulfates with alkali metals, copper, gold or silver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/39—Photocatalytic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0215—Coating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2035—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/104—Silver
    • 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
    • B01D2255/00—Catalysts
    • B01D2255/80—Type of catalytic reaction
    • B01D2255/802—Photocatalytic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0275—Other waste gases from food processing plants or kitchens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/06—Polluted air
    • 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
    • B01D2259/804—UV light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
    • F24F8/22—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using UV light

Definitions

  • the application relates generally to an air filter for grease filtering.
  • Background Kitchen ventilation in restaurants and institutional kitchens has been enhanced by placing the intake opening of a ventilation duct above griddles and cooking surfaces and by fitting an air filter thereto. With the ventilation system in operation, the air to be removed from a kitchen is drawn across the filter into an air duct along which the filtered air flows by way of an exhaust opening out of the building.
  • What can be used in the intake opening is e.g. an air filter, including a perforated disc-shaped plate which is rotated by means of an electric motor. Some of the absorbed air flows through the rotating plate's perforations into an air duct while, by virtue of the rotation, some of the air flows along the plate's sur- face producing an airbed thereon. Some of the airborne particles make contact with rims of the rotating plate's perforations and some with the produced airbed with which the latter particles move away from the plate. The withdrawn particles are not able to bypass the plate into the air duct but migrate into a collector vessel of the air filter to be removed therefrom during maintenance.
  • a problem with available filters involves e.g.
  • the one objective of the invention is attained with an air filter of claim 1 , a filtering method of claim 9, and a filter system of claim 10.
  • the air filter which is intended for grease filtering, comprises a filter mounting element for installing the filter in connection with an intake opening of an air ventilation duct, at least one mechanical sepa- ration element for separating solid impurities from flowing air, and a UV source mounting element capable of being fitted with a UV source for generating UV light.
  • the UV light and a catalyst coating inside the filter are adapted to transform the physical state of grease flowing into the air duct along with the airflow.
  • the intake opening of an air duct refers e.g. to an air duct opening by which the indoor air is drawn into the air duct for removing the same from a building along the air duct.
  • the catalyst coating refers e.g. to the coating or treatment of an air filter structure or components to be mounted thereon, such that it develops a surface that functions as a catalyst e.g. in catalysis or photocatalysis.
  • the filtering method according to one embodiment, which intended for grease filtering, is carried out with an air filter.
  • the air filter comprises a filter mounting element for installing the filter in connection with an intake opening of an air ventilation duct, at least one mechanical separation element for separating solid impurities from flowing air, and a UV source mounting element capable of being fitted with a UV source for generating UV light.
  • the method comprises using UV light and a catalyst coating inside the filter for changing the physical state of grease flowing along with the airflow.
  • the filter system which is intended for grease filtering, comprises an air filter.
  • the air filter comprises a filter mounting ele- ment for installing the filter in connection with an intake opening of an air ventilation duct, at least one mechanical separation element for separating solid impurities from flowing air, and a UV source mounting element capable of be- ing fitted with a UV source for generating UV light.
  • the UV light and a catalyst coating inside the filter are adapted to change the physical state of grease flowing along with the airflow.
  • the system comprises a control element for controlling at least one air filter.
  • figs. 1 a-1 e show an air filter structure provided with a rotating perforated plate as seen from various directions and in cross-section
  • fig. 1 f shows a cross-section for an air filter fitted with fixed separators
  • fig. 2 shows functional units for a filter system. Detailed description of the figures
  • Figs. 1 a-1 d illustrate a first air filter 104 for filtering liquid and/or gaseous impurities, e.g. grease, as seen from various directions.
  • the filter 104 can be an installed fixture e.g. in a restaurant or institutional kitchen.
  • the filter 104 may comprise a housing 1 10, which can be manufactured e.g. from stainless or zinc-plated steel.
  • the housing 1 10 comprises a mounting element 1 12, e.g. an outlet collar, which enables installation of the filter 104 in connection with an intake opening 103 of an air ventilation duct 101 , e.g. at the end of an air duct or at the connection of a ventilation ceiling structure, in such a way that the filter 104 is concentric with the air ventilation duct 101 .
  • a mounting element 1 12 e.g. an outlet collar
  • the mounting element 1 12 can have a diameter (diameter d) to enable its fitting inside the ventilation duct 101 and it is capable of being braced and de- tachably secured to its position on an internal wall of the ventilation duct 101 .
  • the mounting element 1 12 can have its height h 0,25-1 x the length of the di- ameter d of the mounting element 1 12.
  • the housing 1 10 comprises a chamber portion 1 14 in attachment with the mounting element 1 12.
  • the chamber portion 1 14 can have a surface area in the direction of an airflow 103 which is at least equal to the surface area of the mounting element 1 12 in the direction of the airflow 103.
  • Fig. 1 e shows the structure of the filter 104 from a cross-section E-E of fig. 1 d.
  • a mounting element 132 for a UV source 130 which is capable of being fitted with at least one UV source 130, e.g. a UV lamp, e.g. a UV led lamp or a UV fluorescent tube lamp, for generat- ing UV light.
  • a UV lamp e.g. a UV led lamp or a UV fluorescent tube lamp
  • the UV source 130 can be provided as a non-ozone producing US source, thus improving safety of the filter 104 by eliminating the ozone-related hazards to people.
  • the construction of the filter 104 is simplified by not needing complicated safety technology because of ozone.
  • the housing 1 10 further comprises a collar portion 1 16 in attachment with the chamber portion 1 14.
  • the truncated cone-shaped (annular) collar portion 1 16 can have the diameter of its bottom edge smaller than that of its top edge which lies against the chamber portion 1 14.
  • At least one mechanical separation element (separator, filter element) 120, e.g. a rotating perforated disc-shaped plate (separation plate), for separating impurities, e.g. dirt particles, from flowing air 103.
  • a motor 122 e.g. an electric motor, which is braced with supports 124 e.g. on the chamber portion 1 14.
  • the perforated plate 120 can be installed in the filter 104 by having the cham- ber portion 1 14 is between the perforated plate 120 and the mounting element 1 12.
  • the housing 1 10 comprises a protective dome portion 1 18 with a function of working as a collection tray for grease and dirt separated by the separation element 120 from the air 103.
  • the protective dome portion 1 18 comprises a discharge element 1 19 by means of which can be removed the grease and dirt accumulated on an internal surface 1 15 of the protective dome portion 1 18.
  • the filter 104 may further comprise coupling means, e.g. maintenance and safety switches, by means of which it can be connected to the power grid. It may further include a microswitch, which enables the UV source 130 and the separation element 120 to be switched off as the protective dome portion 1 18 is opened.
  • coupling means e.g. maintenance and safety switches, by means of which it can be connected to the power grid. It may further include a microswitch, which enables the UV source 130 and the separation element 120 to be switched off as the protective dome portion 1 18 is opened.
  • the filter 104 is energy efficient as the employed UV source 130 and motor 122 can have a joint power consumption of less than 100 W.
  • the coating can be present on the internal surface 1 15 of the chamber portion 1 14 and/or on the internal surface 1 13 of the mounting element 1 12.
  • the coating can be present on an internal surface of the collar portion 1 16.
  • the coated portion 1 12, 1 14 can be capable of being fitted with at least one surface panel, e.g. 1 -4 surface panels, covered at least partially with a coating.
  • the mounting element 132 can be fitted in connection with the coated portion 1 12, 1 14 in such a way that the UV source 130 is not further than e.g. 50 cm away from a coating present on the coated portion 1 12, 1 14 for maintaining the effective impact of UV light.
  • the mounting element 132 can be installed in connection with the perforated plate 120 which is covered at least partially with a coating.
  • the air 103 to be exhausted is drawn by way of an annular slit between the collar portion 1 16 and the protective dome portion 1 18 into an interior of the filter 104 where it comes across the rotating perforated plate 120.
  • Grease and dirt are separated from the airflow 103 and proceed along with a part of the air- flow 103 towards an outer rim of the perforated plate 120 and a gutter 1 17 present at a bottom edge of the collar portion 1 16. From the gutter 1 17, the separated impurities migrate into the protective dome 1 18 and can be purged therefrom by means of the discharge element 1 19.
  • the pre-scrubbed airflow 103 flows by way of apertures of the perforated plate 120 into the chamber portion 1 14 and/or into the mounting element 1 12, wherein, in a so-called post-scrubbing process, the UV light and the coating inside the filter 104 transform in photocatalysis the physical state of liquid and/or gaseous grease still flowing along with the airflow 103 towards the ventilation duct 101 by fragmenting the grease (fat molecules) into carbon dioxide, water, and a pulverized carbon compound, whereby these can be removed from the kitchen along the ventilation duct 101 with outgoing air.
  • the combination made up of the coating and UV light is effective in reducing odor nuisances.
  • the combination made up of the separation element 120 as well as the coating and UV light improves the grease-separating capability of the filter 104 with a minor pressure loss as the mechanical filtration takes place in just a single process with the rotating perforated plate 120.
  • the filter 104 works effectively also with changing airflows 103, since the separation is effected by rotation of the perforated plate 120, not by means of the rate of speed of the airflow 103 which is the case in filters operating on centrifugal and collision principle wherein the speed of the airflow 103 and the separating capability of the filter are interdependent.
  • the filter 104 is easy to maintain, economically sensible, and has a long service life.
  • Fig. 1 f shows another air filter 104 in a cross-section, wherein the mechanical separation is carried out with fixed separation elements 120a, 120b as opposed to the air filter 104 of figs. 1 a-1 e.
  • the air filter 104 has its housing 1 10 comprising a mounting element 1 12, which enables an installation of the filter 104 in connection with an intake opening 103 of an air ventilation duct 101 .
  • the mounting element 1 12 can have a diameter to enable its fitting inside the ventilation duct 101 and capable of being braced and detachably secured to its position on an internal wall of the ventilation duct 101 .
  • the housing 1 10 further comprises a collar portion 1 16 attached to the mounting element 1 12.
  • the collar portion 1 16 has accommodated therein two separation elements 120a, 120b, e.g. fixed separators.
  • the housing 1 10 comprises a mounting element 132 for a UV source 130, which is installed on the side including the collar portion 1 16 and which is capable of being fitted with at least one UV source 130, which can be e.g. a non-ozone producing UV source, in such a way that it will lie on the side including the mounting element 1 12.
  • a UV source 130 which can be e.g. a non-ozone producing UV source, in such a way that it will lie on the side including the mounting element 1 12.
  • a coated portion 1 12 of the filter 104 is made up by the mounting element 1 12, having its internal surface at least partially covered with a catalyst coating which may comprise at least titanium dioxide and/or silver sulfate.
  • the mounting element 1 12 may be capable of being fitted with at least one removable surface panel, e.g. 1 -4 surface panels, covered at least partially with a coating.
  • the mounting element 132 can be installed in connection with the mounting element 1 12 in such a way that the installed UV source 130 shall not be further than e.g. 50 cm away from a coating present on an internal surface 1 13.
  • the filter 104 further comprises coupling means and a microswitch matching those in the filter 104 of figs. 1 a-1 e.
  • the air 103 to be exhausted is drawn through the separators 120a, 120b of the collar portion 1 16, wherein solid grease and dirt are filtered from the airflow 103.
  • the pre-purged airflow 103 flows into the mounting element 1 12, wherein, in a post-scrubbing process, the UV light and the coating transform - or the coating transforms - the physical state of liquid and/or gaseous grease flowing towards the ventilation duct 101 so as to enable its removal from the building along the ventilation duct 101 .
  • Fig. 2 shows functional units 204, 240, 242, 244, 246, 250, 254, 256, 258 for a filter system 200 intended for grease filtering.
  • the system 200 comprises at least one filter 204 presented in the preceding figures, e.g. 1 -10 filters 204.
  • system 200 comprises a control unit (monitoring unit) 240.
  • the control unit 240 may comprise a processor component 242, which com- prises at least one processor and by means of which instructions defined e.g. by a user or some application program are executed and data is processed.
  • the control unit 240 may further comprise a memory component 244, which comprises at least one memory and is intended for storing and maintaining e.g. instructions, application programs and operational data of the at least one filter 204.
  • the control unit 240 may further comprise a data transfer component 246, by means of which the control unit 240 transmits and/or receives information from each filter 204 over at least one wired and/or wireless communication link.
  • control unit 240 may comprise a connection for a power source component, e.g. for at least one battery functioning as the power source or for an external power source.
  • the control unit 240 may further comprise a user interface component 248, by means of/over which the user is able, if necessary, to enter information into the control unit 240 and/or to receive information therefrom.
  • the user interface component 248 may comprise at least one of the following: a keyboard, function keys, a led display, a touchpad, a touchscreen, and a microphone/speaker unit.
  • the memory unit 244 may comprise at least an application 256 controlling operation of the data transfer component 246, an application controlling operation of the power source component, an application 258 controlling operation of the user interface component 248, and an application 260 controlling operation of the at least one filter 204.
  • the application 260 when executed by the unit 240, controls operation of at least one filter 204, e.g. the operation of its motor 122 and/or its UV lamp 130. It comprises a motor control code and a UV lamp control code, by means of which it acquires, among other things, status information about operation of the motor 122 and the UV lamp 130, transmits acquired information to a building automation system, and presents acquired status information by means of the user interface component 248, e.g. a led display. Based on the presented status information, it is possible to focus and/or time the maintenance measures correctly.

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

Abstract

The application relates according to one embodiment to an air filter (104) for grease filtering. The filter comprises a filter mounting element (112) for installing the filter in connection with an intake opening (102) of an air ventilation duct (101), at least one mechanical separation element (120) for separating solid impurities from flowing air (103), and a UV source mounting element (132) capable of being fitted with a UV source (130) for generating UV light. The UV light and a catalyst coating present inside the filter are adapted to transform the physical state of grease flowing into the ventilation duct along with the airflow.

Description

AIR FILTER FOR GREASE FILTERING Technical field
The application relates generally to an air filter for grease filtering. Background Kitchen ventilation in restaurants and institutional kitchens has been enhanced by placing the intake opening of a ventilation duct above griddles and cooking surfaces and by fitting an air filter thereto. With the ventilation system in operation, the air to be removed from a kitchen is drawn across the filter into an air duct along which the filtered air flows by way of an exhaust opening out of the building.
What can be used in the intake opening is e.g. an air filter, including a perforated disc-shaped plate which is rotated by means of an electric motor. Some of the absorbed air flows through the rotating plate's perforations into an air duct while, by virtue of the rotation, some of the air flows along the plate's sur- face producing an airbed thereon. Some of the airborne particles make contact with rims of the rotating plate's perforations and some with the produced airbed with which the latter particles move away from the plate. The withdrawn particles are not able to bypass the plate into the air duct but migrate into a collector vessel of the air filter to be removed therefrom during maintenance. A problem with available filters involves e.g. small grease particles originating from the flying fat and gaseous grease which the rotating plate is not able to eliminate completely. The grease that has penetrated through perforations of the plate accumulates on elements of the filter and in the air duct, causing a fire hazard and an increased filter and air duct cleaning demand. In addition, some of the grease migrates through the air duct along with exhaust air to the surroundings of a building, causing together with other contaminants an odor nuisance.
In addition, the grease migrated through an air duct fouls the building and its surroundings. Summary
It is one objective of the invention to overcome problems of the available air filters and to provide a simple, safe and easy-to-maintain air filter which is effective in removing liquid and/or gaseous impurities. The one objective of the invention is attained with an air filter of claim 1 , a filtering method of claim 9, and a filter system of claim 10.
The air filter according to one embodiment, which is intended for grease filtering, comprises a filter mounting element for installing the filter in connection with an intake opening of an air ventilation duct, at least one mechanical sepa- ration element for separating solid impurities from flowing air, and a UV source mounting element capable of being fitted with a UV source for generating UV light. The UV light and a catalyst coating inside the filter are adapted to transform the physical state of grease flowing into the air duct along with the airflow.
The intake opening of an air duct refers e.g. to an air duct opening by which the indoor air is drawn into the air duct for removing the same from a building along the air duct.
The catalyst coating refers e.g. to the coating or treatment of an air filter structure or components to be mounted thereon, such that it develops a surface that functions as a catalyst e.g. in catalysis or photocatalysis. The filtering method according to one embodiment, which intended for grease filtering, is carried out with an air filter. The air filter comprises a filter mounting element for installing the filter in connection with an intake opening of an air ventilation duct, at least one mechanical separation element for separating solid impurities from flowing air, and a UV source mounting element capable of being fitted with a UV source for generating UV light. The method comprises using UV light and a catalyst coating inside the filter for changing the physical state of grease flowing along with the airflow.
The filter system according to one embodiment, which is intended for grease filtering, comprises an air filter. The air filter comprises a filter mounting ele- ment for installing the filter in connection with an intake opening of an air ventilation duct, at least one mechanical separation element for separating solid impurities from flowing air, and a UV source mounting element capable of be- ing fitted with a UV source for generating UV light. The UV light and a catalyst coating inside the filter are adapted to change the physical state of grease flowing along with the airflow. In addition, the system comprises a control element for controlling at least one air filter. Other embodiments are presented in the dependent claims.
Brief description of the figures
It is in the detailed description of the figures that embodiments of the invention are recounted more precisely with reference to the accompanying figures, in which figs. 1 a-1 e show an air filter structure provided with a rotating perforated plate as seen from various directions and in cross-section, fig. 1 f shows a cross-section for an air filter fitted with fixed separators, and
fig. 2 shows functional units for a filter system. Detailed description of the figures
Figs. 1 a-1 d illustrate a first air filter 104 for filtering liquid and/or gaseous impurities, e.g. grease, as seen from various directions. The filter 104 can be an installed fixture e.g. in a restaurant or institutional kitchen.
The filter 104 may comprise a housing 1 10, which can be manufactured e.g. from stainless or zinc-plated steel.
The housing 1 10 comprises a mounting element 1 12, e.g. an outlet collar, which enables installation of the filter 104 in connection with an intake opening 103 of an air ventilation duct 101 , e.g. at the end of an air duct or at the connection of a ventilation ceiling structure, in such a way that the filter 104 is concentric with the air ventilation duct 101 .
The mounting element 1 12 can have a diameter (diameter d) to enable its fitting inside the ventilation duct 101 and it is capable of being braced and de- tachably secured to its position on an internal wall of the ventilation duct 101 .
The mounting element 1 12 can have its height h 0,25-1 x the length of the di- ameter d of the mounting element 1 12. In addition, the housing 1 10 comprises a chamber portion 1 14 in attachment with the mounting element 1 12.
The chamber portion 1 14 can have a surface area in the direction of an airflow 103 which is at least equal to the surface area of the mounting element 1 12 in the direction of the airflow 103.
Fig. 1 e shows the structure of the filter 104 from a cross-section E-E of fig. 1 d.
Inside the chamber portion 1 14 is fitted a mounting element 132 for a UV source 130, which is capable of being fitted with at least one UV source 130, e.g. a UV lamp, e.g. a UV led lamp or a UV fluorescent tube lamp, for generat- ing UV light.
The UV source 130 can be provided as a non-ozone producing US source, thus improving safety of the filter 104 by eliminating the ozone-related hazards to people.
Further, by virtue of the non-ozone producing UV source 130, the construction of the filter 104 is simplified by not needing complicated safety technology because of ozone.
The housing 1 10 further comprises a collar portion 1 16 in attachment with the chamber portion 1 14. The truncated cone-shaped (annular) collar portion 1 16 can have the diameter of its bottom edge smaller than that of its top edge which lies against the chamber portion 1 14.
In the collar portion 1 16 is accommodated at least one mechanical separation element (separator, filter element) 120, e.g. a rotating perforated disc-shaped plate (separation plate), for separating impurities, e.g. dirt particles, from flowing air 103. Responsible for rotating the perforated plate 120 is a motor 122, e.g. an electric motor, which is braced with supports 124 e.g. on the chamber portion 1 14.
In fig. 1 d, showing the filter 104 from above, the perforated plate 120 and its motor 122 have not been presented.
The perforated plate 120 can be installed in the filter 104 by having the cham- ber portion 1 14 is between the perforated plate 120 and the mounting element 1 12. In addition, the housing 1 10 comprises a protective dome portion 1 18 with a function of working as a collection tray for grease and dirt separated by the separation element 120 from the air 103.
The protective dome portion 1 18 comprises a discharge element 1 19 by means of which can be removed the grease and dirt accumulated on an internal surface 1 15 of the protective dome portion 1 18.
The filter 104 may further comprise coupling means, e.g. maintenance and safety switches, by means of which it can be connected to the power grid. It may further include a microswitch, which enables the UV source 130 and the separation element 120 to be switched off as the protective dome portion 1 18 is opened.
The filter 104 is energy efficient as the employed UV source 130 and motor 122 can have a joint power consumption of less than 100 W.
Inside the filter 104 can be a coated portion 1 12, 1 14, having its surface 1 13, 1 15 at least partially covered with a catalyst coating which may comprise at least titanium dioxide (TiO2) and/or silver sulfate (Ag2SO4).
The coating can be present on the internal surface 1 15 of the chamber portion 1 14 and/or on the internal surface 1 13 of the mounting element 1 12.
Alternatively, or in addition to at least one of the foregoing elements 1 14, 1 12, the coating can be present on an internal surface of the collar portion 1 16.
Alternatively, or in addition to the foregoing, the coated portion 1 12, 1 14 can be capable of being fitted with at least one surface panel, e.g. 1 -4 surface panels, covered at least partially with a coating.
The mounting element 132 can be fitted in connection with the coated portion 1 12, 1 14 in such a way that the UV source 130 is not further than e.g. 50 cm away from a coating present on the coated portion 1 12, 1 14 for maintaining the effective impact of UV light.
In addition, the mounting element 132 can be installed in connection with the perforated plate 120 which is covered at least partially with a coating. The air 103 to be exhausted is drawn by way of an annular slit between the collar portion 1 16 and the protective dome portion 1 18 into an interior of the filter 104 where it comes across the rotating perforated plate 120. Grease and dirt are separated from the airflow 103 and proceed along with a part of the air- flow 103 towards an outer rim of the perforated plate 120 and a gutter 1 17 present at a bottom edge of the collar portion 1 16. From the gutter 1 17, the separated impurities migrate into the protective dome 1 18 and can be purged therefrom by means of the discharge element 1 19.
The pre-scrubbed airflow 103 flows by way of apertures of the perforated plate 120 into the chamber portion 1 14 and/or into the mounting element 1 12, wherein, in a so-called post-scrubbing process, the UV light and the coating inside the filter 104 transform in photocatalysis the physical state of liquid and/or gaseous grease still flowing along with the airflow 103 towards the ventilation duct 101 by fragmenting the grease (fat molecules) into carbon dioxide, water, and a pulverized carbon compound, whereby these can be removed from the kitchen along the ventilation duct 101 with outgoing air.
It is possible to carry out post-scrubbing without UV light, since the coating transforms in catalysis the physical state of fat even without UV light.
The combination made up of the coating and UV light is effective in reducing odor nuisances.
In addition, the combination made up of the separation element 120 as well as the coating and UV light improves the grease-separating capability of the filter 104 with a minor pressure loss as the mechanical filtration takes place in just a single process with the rotating perforated plate 120. Moreover, the filter 104 works effectively also with changing airflows 103, since the separation is effected by rotation of the perforated plate 120, not by means of the rate of speed of the airflow 103 which is the case in filters operating on centrifugal and collision principle wherein the speed of the airflow 103 and the separating capability of the filter are interdependent. Furthermore, the filter 104 is easy to maintain, economically sensible, and has a long service life. Fig. 1 f shows another air filter 104 in a cross-section, wherein the mechanical separation is carried out with fixed separation elements 120a, 120b as opposed to the air filter 104 of figs. 1 a-1 e.
The air filter 104 has its housing 1 10 comprising a mounting element 1 12, which enables an installation of the filter 104 in connection with an intake opening 103 of an air ventilation duct 101 . The mounting element 1 12 can have a diameter to enable its fitting inside the ventilation duct 101 and capable of being braced and detachably secured to its position on an internal wall of the ventilation duct 101 . The housing 1 10 further comprises a collar portion 1 16 attached to the mounting element 1 12. The collar portion 1 16 has accommodated therein two separation elements 120a, 120b, e.g. fixed separators.
In addition, the housing 1 10 comprises a mounting element 132 for a UV source 130, which is installed on the side including the collar portion 1 16 and which is capable of being fitted with at least one UV source 130, which can be e.g. a non-ozone producing UV source, in such a way that it will lie on the side including the mounting element 1 12.
A coated portion 1 12 of the filter 104 is made up by the mounting element 1 12, having its internal surface at least partially covered with a catalyst coating which may comprise at least titanium dioxide and/or silver sulfate.
Alternatively, or in addition to the foregoing, the mounting element 1 12 may be capable of being fitted with at least one removable surface panel, e.g. 1 -4 surface panels, covered at least partially with a coating.
The mounting element 132 can be installed in connection with the mounting element 1 12 in such a way that the installed UV source 130 shall not be further than e.g. 50 cm away from a coating present on an internal surface 1 13.
The filter 104 further comprises coupling means and a microswitch matching those in the filter 104 of figs. 1 a-1 e.
The air 103 to be exhausted is drawn through the separators 120a, 120b of the collar portion 1 16, wherein solid grease and dirt are filtered from the airflow 103. The pre-purged airflow 103 flows into the mounting element 1 12, wherein, in a post-scrubbing process, the UV light and the coating transform - or the coating transforms - the physical state of liquid and/or gaseous grease flowing towards the ventilation duct 101 so as to enable its removal from the building along the ventilation duct 101 .
Fig. 2 shows functional units 204, 240, 242, 244, 246, 250, 254, 256, 258 for a filter system 200 intended for grease filtering.
The system 200 comprises at least one filter 204 presented in the preceding figures, e.g. 1 -10 filters 204.
In addition, the system 200 comprises a control unit (monitoring unit) 240.
The control unit 240 may comprise a processor component 242, which com- prises at least one processor and by means of which instructions defined e.g. by a user or some application program are executed and data is processed.
The control unit 240 may further comprise a memory component 244, which comprises at least one memory and is intended for storing and maintaining e.g. instructions, application programs and operational data of the at least one filter 204.
The control unit 240 may further comprise a data transfer component 246, by means of which the control unit 240 transmits and/or receives information from each filter 204 over at least one wired and/or wireless communication link.
In addition, the control unit 240 may comprise a connection for a power source component, e.g. for at least one battery functioning as the power source or for an external power source.
The control unit 240 may further comprise a user interface component 248, by means of/over which the user is able, if necessary, to enter information into the control unit 240 and/or to receive information therefrom. The user interface component 248 may comprise at least one of the following: a keyboard, function keys, a led display, a touchpad, a touchscreen, and a microphone/speaker unit.
The memory unit 244 may comprise at least an application 256 controlling operation of the data transfer component 246, an application controlling operation of the power source component, an application 258 controlling operation of the user interface component 248, and an application 260 controlling operation of the at least one filter 204.
The application 260, when executed by the unit 240, controls operation of at least one filter 204, e.g. the operation of its motor 122 and/or its UV lamp 130. It comprises a motor control code and a UV lamp control code, by means of which it acquires, among other things, status information about operation of the motor 122 and the UV lamp 130, transmits acquired information to a building automation system, and presents acquired status information by means of the user interface component 248, e.g. a led display. Based on the presented status information, it is possible to focus and/or time the maintenance measures correctly.
Described above are just a few embodiments of the invention. The principle according to the invention can be varied within the scope of protection defined by the claims, regarding e.g. implementation details as well as fields of use.

Claims

Claims
1 . An air filter (104, 204) for grease filtering, said filter comprising
a filter mounting element (1 12) for installing the filter in connection with an intake opening (102) of an air ventilation duct (101 ),
at least one mechanical separation element (120, 1 20a, 120b) for separating solid impurities from flowing air (103), and
a UV source mounting element (132) capable of being fitted with a UV source (130) for generating UV light,
characterized in that
the UV light and a catalyst coating present inside the filter are adapted to transform the physical state of grease flowing into the ventilation duct along with the airflow.
2. A filter according to claim 1 , wherein the filter houses a coated portion (1 12, 1 14), which has its surface at least partially covered with a coating and/or which can be fitted with at least one removable surface panel covered with a coating.
3. A filter according to either of the preceding claims, wherein the UV source mounting element is installed in connection with the coated portion, and the coated portion is a chamber portion (1 14) and/or an internal surface (1 13) of the filter mounting element.
4. A filter according to any of the preceding claims, wherein the coating comprises at least titanium dioxide or silver sulfate.
5. A filter according to any of the preceding claims, wherein the UV source mounting element is installed in connection with at least one separation ele- ment and the at least one separation element is coated at least partially with a coating.
6. A filter according to any of the preceding claims, wherein the separation plate is a perforated plate (120), which is adapted to be rotatable and which is fitted to the filter in such a way that the chamber portion lies between the per- forated plate and the filter mounting element.
7. A filter according to any of the preceding claims, wherein the installed UV source generates non-ozone producing UV light.
8. A filter according to any of the preceding claims, wherein the chamber portion has a surface area in the direction of an airflow which is at least equal to the surface area of the filter mounting element in the direction of the airflow and/or the filter mounting element has a height (h) which is 0,25 x the length of a diameter (d) of the filter mounting element.
9. A filtering method for grease filtering with an air filter (104, 204) according to any of claims 1 -8, said filter comprising
a filter mounting element (1 12) for installing the filter in connection with an intake opening (102) of an air ventilation duct (101 ),
at least one mechanical separation element (120, 1 20a, 120b) for separating solid impurities from flowing air (103), and
a UV source mounting element (132) capable of being fitted with a UV source (130) for generating UV light,
said method comprising
using the UV light and a catalyst coating present inside the filter are adapted to transform the physical state of grease flowing along with the airflow.
10. A filter system (200) for grease filtering, said system comprising
at least one air filter (104, 204) according to any of claims 1 -8, which comprises
a filter mounting element (1 12) for installing the filter in connection with an intake opening (102) of an air ventilation duct (101 ),
at least one mechanical separation element (120, 1 20a, 120b) for separating solid impurities from flowing air (103), and
a UV source mounting element (132) capable of being fitted with a UV source (130) for generating UV light, said UV light and a catalyst coating present inside the filter being adapted to transform the physical state of grease flowing along with the airflow, and
a control unit (240) for controlling the at least one air filter.
PCT/FI2016/050355 2015-05-29 2016-05-25 Air filter for grease filtering Ceased WO2016193533A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
PL16802630.0T PL3303934T3 (en) 2015-05-29 2016-05-25 Air filter for grease filtering and method using an air filter
KR1020177034299A KR102549299B1 (en) 2015-05-29 2016-05-25 Air filter for retaining filtration
EP16802630.0A EP3303934B1 (en) 2015-05-29 2016-05-25 Air filter for grease filtering and method using an air filter
RU2017142082A RU2709942C2 (en) 2015-05-29 2016-05-25 Air filter for filtration of fatty substances
US15/577,566 US11248805B2 (en) 2015-05-29 2016-05-25 Air filter for grease filtering
CA2987679A CA2987679C (en) 2015-05-29 2016-05-25 Air filter for grease filtering

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20155414 2015-05-29
FI20155414A FI129453B (en) 2015-05-29 2015-05-29 Air filter for grease filtration

Publications (1)

Publication Number Publication Date
WO2016193533A1 true WO2016193533A1 (en) 2016-12-08

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PCT/FI2016/050355 Ceased WO2016193533A1 (en) 2015-05-29 2016-05-25 Air filter for grease filtering

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US (1) US11248805B2 (en)
EP (1) EP3303934B1 (en)
KR (1) KR102549299B1 (en)
FI (1) FI129453B (en)
PL (1) PL3303934T3 (en)
RU (1) RU2709942C2 (en)
WO (1) WO2016193533A1 (en)

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CN108167893A (en) * 2017-12-27 2018-06-15 宁波航天吉麦克环保科技有限公司 A kind of entirety petticoat pipe and its control method
CN108870494A (en) * 2018-08-10 2018-11-23 周石共 A kind of cooking fume cleaner
CN108954446A (en) * 2018-08-10 2018-12-07 周石共 A kind of purification method of kitchen fume
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Also Published As

Publication number Publication date
RU2017142082A3 (en) 2019-07-24
KR102549299B1 (en) 2023-06-28
US20180163973A1 (en) 2018-06-14
RU2709942C2 (en) 2019-12-23
RU2017142082A (en) 2019-07-01
EP3303934A4 (en) 2019-03-06
PL3303934T3 (en) 2022-10-31
FI20155414A7 (en) 2016-11-30
KR20180010201A (en) 2018-01-30
EP3303934A1 (en) 2018-04-11
FI129453B (en) 2022-02-28
EP3303934B1 (en) 2022-06-22
US11248805B2 (en) 2022-02-15
CA2987679A1 (en) 2016-12-08

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