WO2011078771A1 - Plate heat exchanger comprising uv generating members - Google Patents

Plate heat exchanger comprising uv generating members Download PDF

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Publication number
WO2011078771A1
WO2011078771A1 PCT/SE2010/051423 SE2010051423W WO2011078771A1 WO 2011078771 A1 WO2011078771 A1 WO 2011078771A1 SE 2010051423 W SE2010051423 W SE 2010051423W WO 2011078771 A1 WO2011078771 A1 WO 2011078771A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
plate heat
plates
generating members
plate
Prior art date
Application number
PCT/SE2010/051423
Other languages
French (fr)
Inventor
Johan Duprez
Original Assignee
Wallenius Water Aktiebolag
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 Wallenius Water Aktiebolag filed Critical Wallenius Water Aktiebolag
Priority to EP10839892.6A priority Critical patent/EP2515950A4/en
Publication of WO2011078771A1 publication Critical patent/WO2011078771A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C02F1/325—Irradiation devices or lamp constructions
    • 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
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
    • A61L2/08—Radiation
    • A61L2/10—Ultra-violet radiation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/086—Heat exchange elements made from metals or metal alloys from titanium or titanium alloys
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C02F2103/023—Water in cooling circuits
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/322—Lamp arrangement
    • C02F2201/3225—Lamps immersed in an open channel, containing the liquid to be treated
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/20—Prevention of biofouling
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/10—Photocatalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • F28D9/005—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/20—Safety or protection arrangements; Arrangements for preventing malfunction for preventing development of microorganisms

Definitions

  • Plate heat exchanger comprising UV generating members
  • the present invention relates to a device for treatment of fluids and in particular a device that prevents the build-up of organic matter on surfaces of plate heat exchangers.
  • Heat exchangers are used in many applications and for many purposes where energy in one media is extracted in order to obtain and use the energy.
  • the applications are numerous and water is often used as one media that flows through a heat exchanger.
  • heat exchangers of a plate-type configuration are used, where a plurality of plates are stacked on each other, forming channels between the plates. The two media are then introduced in the channels, one media in every second channel. Due to the large heat transferring surfaces of the heat exchanger, the heat from one media is transferred to the other media.
  • biofilms Depending on type of application and type of media, it may contain organic matter that will deposit on the surfaces of the plate exchanger and also grow on the surfaces, especially if the conditions for this are good, creating growth of organisms, fungi, bacteria, viruses and the like, i.e. biofilms. These biofilms degrade heat transfer efficiency, increase pressure drop (and pumping power required) through exchanger tubes and plates by substantially reducing the transfer capability due to insulation effects as well as flow rates through these machines, and can lead to corrosion problems under the film.
  • the aim of the present invention is to remedy most drawbacks with the state of the art systems and to provide a system which definitely and totally removes any unwanted matter.
  • a plate heat comprising a number of plates stacked on top of each other, UV generating members arranged such that surfaces of said plates are radiated with UV light at the inlet of the plate heat exchanger.
  • at least the irradiated surfaces of said plates are arranged with material displaying photo-catalytic properties, whereby said UV light in combination with said catalytic surfaces create radicals, which radicals are effective in treating fluid through the heat exchanger as well as removing and preventing scale on said surfaces of the heat exchanger.
  • the surfaces of the plates are made of or covered with, titanium, which surfaces have been treated to form titanium dioxide.
  • UV generating members also are arranged at the outlet of the heat exchanger.
  • it further comprises a net made of or covered with a material displaying photo-catalytic properties and positioned in the vicinity of said UV generating members.
  • the advantages of the present invention are several.
  • the application of UV- light in the plate exchanger will promote the removal of any biofilm on the surfaces of the plate heat exchanger as well as prevent any build-up of biofilm.
  • the radicals are extremely powerful in destroying any matter in the water, whereby no biofilm can be built up in the heat exchanger. Also if a treatment member according to the invention is connected to a heat exchanger having biofilm on its surfaces, the radicals will effectively remove the biofilm.
  • the surfaces of the heat exchanger are display photo- catalytic properties, but plate exchangers may be made by other material that do not display any catalytic properties.
  • catalysts may be placed in the inlet and radiated, such as nets comprising titanium dioxide. Of course both catalytic surfaces and catalytic nets may be used.
  • Fig. 1 shows schematically the layout and function of a plate heat exchanger
  • Fig. 2 shows schematically a heat exchanger arranged with treatment means at an inlet of the heat exchanger.
  • the system according of the present invention shown schematically in the drawings is utilizing AOT, i.e. Advanced Oxidation Technology as a treatment function.
  • AOT i.e. Advanced Oxidation Technology
  • the AOT technology is based on UV-light and catalysts for creating radicals, which act to destroy and decompose many organisms and matter.
  • a plate heat exchanger 10 provided with a number of plates, between which channels run, Fig. 1.
  • the channels are arranged such that one fluid runs in every second channel and a second fluid in every second channel.
  • the plates of the heat exchanger 10 are made of or covered with titanium treated to create titanium dioxide.
  • the inlet 12 of the heat exchanger 10, through which the fluid to be treated is intended to run, is provided with UV generating members 14, Fig. 2, such as UV lamps, capable of emitting UV radiation.
  • a net 16 covered by or made of, titanium, and treated to create titanium dioxide, is also placed in the inlet.
  • the UV lamps 14 thus radiate the surfaces of the plate heat exchanger as well as the net 16, whereby a photo-catalytic reaction creates a large amount of radicals, which radicals effectively destroys any organisms and other matter in the liquid as well as removes any biofilm that may have been built up on the surfaces of the heat exchanger. Further use of the UV lamps will effectively prevent any build-up of biofilm on the surfaces. It is to be understood that the UV lamps may also be placed at the outlet of the plate heat exchanger for further treatment of the fluid. It is to be understood that the embodiment described above and shown in the drawings is to be regarded only as a non-limiting example of the invention and that it may be modified in many ways within the scope of the patent claims.

Abstract

The present invention relates to a plate heat exchanger comprising a number of plates (10) stacked on top of each other, UV generating members (14) arranged such that surfaces of said plates (10) are radiated with UV light at the inlet (12) of the plate heat exchanger.

Description

Plate heat exchanger comprising UV generating members
TECHNICAL AREA
The present invention relates to a device for treatment of fluids and in particular a device that prevents the build-up of organic matter on surfaces of plate heat exchangers.
BACKGROUND OF INVENTION
Heat exchangers are used in many applications and for many purposes where energy in one media is extracted in order to obtain and use the energy.
The applications are numerous and water is often used as one media that flows through a heat exchanger. Also, often heat exchangers of a plate-type configuration are used, where a plurality of plates are stacked on each other, forming channels between the plates. The two media are then introduced in the channels, one media in every second channel. Due to the large heat transferring surfaces of the heat exchanger, the heat from one media is transferred to the other media.
Depending on type of application and type of media, it may contain organic matter that will deposit on the surfaces of the plate exchanger and also grow on the surfaces, especially if the conditions for this are good, creating growth of organisms, fungi, bacteria, viruses and the like, i.e. biofilms. These biofilms degrade heat transfer efficiency, increase pressure drop (and pumping power required) through exchanger tubes and plates by substantially reducing the transfer capability due to insulation effects as well as flow rates through these machines, and can lead to corrosion problems under the film.
Several attempts have been made for removing the biofilm, mainly including
treatment with chemicals. However this is not very environmentally friendly and requires thus closed systems where the heat exchangers are flushed with a solvent. This treatment also requires a shut-down of the system during cleaning which negatively affects the production. Other attempts of removing the biofilm comprise the use of ozone that is injected into the system. It has been found that ozone both removes the film but also prevents film from being created on surfaces. Even though ozone is capable of destroying most microorganisms like algae and bacteria by rupturing their cell walls, a process to which microorganisms cannot develop immunity, some organisms require more powerful treatment or longer exposure times than what is really practical in many applications.
BRIEF DESCRIPTION OF INVENTION
The aim of the present invention is to remedy most drawbacks with the state of the art systems and to provide a system which definitely and totally removes any unwanted matter.
This aim is obtained by a system defined by the features of the independent patent claim.
Preferable embodiments of the invention form the subject of the dependent patent claims. According to a main aspect of the invention it is characterised by a plate heat comprising a number of plates stacked on top of each other, UV generating members arranged such that surfaces of said plates are radiated with UV light at the inlet of the plate heat exchanger. According to another aspect of the invention, at least the irradiated surfaces of said plates are arranged with material displaying photo-catalytic properties, whereby said UV light in combination with said catalytic surfaces create radicals, which radicals are effective in treating fluid through the heat exchanger as well as removing and preventing scale on said surfaces of the heat exchanger.
According yet another aspect of the invention, the surfaces of the plates are made of or covered with, titanium, which surfaces have been treated to form titanium dioxide. According to a further aspect of the invention, UV generating members also are arranged at the outlet of the heat exchanger.
According to yet a further aspect of the invention, it further comprises a net made of or covered with a material displaying photo-catalytic properties and positioned in the vicinity of said UV generating members.
The advantages of the present invention are several. The application of UV- light in the plate exchanger will promote the removal of any biofilm on the surfaces of the plate heat exchanger as well as prevent any build-up of biofilm.
The application of material displaying catalytic properties in the heat exchanger and irradiating it with UV light will create a very strong oxidation effect in that large amounts of radicals are created.
The radicals are extremely powerful in destroying any matter in the water, whereby no biofilm can be built up in the heat exchanger. Also if a treatment member according to the invention is connected to a heat exchanger having biofilm on its surfaces, the radicals will effectively remove the biofilm.
It is of course preferable if the surfaces of the heat exchanger are display photo- catalytic properties, but plate exchangers may be made by other material that do not display any catalytic properties. Then catalysts may be placed in the inlet and radiated, such as nets comprising titanium dioxide. Of course both catalytic surfaces and catalytic nets may be used.
These and other aspects of, and advantages with, the present invention will become apparent from the following detailed description of the invention and from the accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
In the following detailed description of the invention, reference will be made to the accompanying drawings, of which Fig. 1 shows schematically the layout and function of a plate heat exchanger, and Fig. 2 shows schematically a heat exchanger arranged with treatment means at an inlet of the heat exchanger.
DETAILED DESCRIPTION OF THE INVENTION
The system according of the present invention shown schematically in the drawings is utilizing AOT, i.e. Advanced Oxidation Technology as a treatment function. The AOT technology is based on UV-light and catalysts for creating radicals, which act to destroy and decompose many organisms and matter.
According to the invention, it comprises a plate heat exchanger 10 provided with a number of plates, between which channels run, Fig. 1. The channels are arranged such that one fluid runs in every second channel and a second fluid in every second channel.
In order to have maximum efficiency in treating the fluid that runs in the channel, the plates of the heat exchanger 10 are made of or covered with titanium treated to create titanium dioxide. Further the inlet 12 of the heat exchanger 10, through which the fluid to be treated is intended to run, is provided with UV generating members 14, Fig. 2, such as UV lamps, capable of emitting UV radiation. A net 16 covered by or made of, titanium, and treated to create titanium dioxide, is also placed in the inlet.
The UV lamps 14 thus radiate the surfaces of the plate heat exchanger as well as the net 16, whereby a photo-catalytic reaction creates a large amount of radicals, which radicals effectively destroys any organisms and other matter in the liquid as well as removes any biofilm that may have been built up on the surfaces of the heat exchanger. Further use of the UV lamps will effectively prevent any build-up of biofilm on the surfaces. It is to be understood that the UV lamps may also be placed at the outlet of the plate heat exchanger for further treatment of the fluid. It is to be understood that the embodiment described above and shown in the drawings is to be regarded only as a non-limiting example of the invention and that it may be modified in many ways within the scope of the patent claims.

Claims

PATENT CLAIMS
1. Plate heat exchanger comprising
- a number of plates stacked on top of each other,
- UV generating members arranged such that surfaces of said plates are radiated with UV light at the inlet of the plate heat exchanger.
2. Plate heat exchanger according to claim 1 , wherein at least the irradiated surfaces of said plates are arranged with material displaying photo-catalytic properties, whereby said UV light in combination with said catalytic surfaces create radicals, which radicals are effective in treating fluid through the heat exchanger as well as removing and preventing scale on said surfaces of the heat exchanger.
3. Plate heat exchanger according to clam 2, wherein the surfaces of the plates are made of or covered with, titanium, which surfaces have been treated to form titanium dioxide.
4. Plate heat exchanger according to clam 1 , wherein UV generating members also are arranged at the outlet of the heat exchanger.
5. Plate exchanger according to any of the preceding claims, wherein it further comprises a net made of or covered with a material displaying photo-catalytic properties and positioned in the vicinity of said UV generating members.
PCT/SE2010/051423 2009-12-21 2010-12-20 Plate heat exchanger comprising uv generating members WO2011078771A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10839892.6A EP2515950A4 (en) 2009-12-21 2010-12-20 Plate heat exchanger comprising uv generating members

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0950999A SE534513C2 (en) 2009-12-21 2009-12-21 Plate heat exchangers including UV-generating devices
SE0950999-3 2009-12-21

Publications (1)

Publication Number Publication Date
WO2011078771A1 true WO2011078771A1 (en) 2011-06-30

Family

ID=44196028

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2010/051423 WO2011078771A1 (en) 2009-12-21 2010-12-20 Plate heat exchanger comprising uv generating members

Country Status (3)

Country Link
EP (1) EP2515950A4 (en)
SE (1) SE534513C2 (en)
WO (1) WO2011078771A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016091732A1 (en) * 2014-12-12 2016-06-16 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
WO2016091982A1 (en) * 2014-12-12 2016-06-16 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
WO2016092083A1 (en) * 2014-12-12 2016-06-16 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
WO2017125543A1 (en) * 2016-01-20 2017-07-27 Koninklijke Philips N.V. A device having surfaces and an anti-biofouling system comprising at least one anti-biofouling light source for emitting rays of anti-biofouling light

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JPH10185228A (en) * 1996-12-24 1998-07-14 Diamond Electric Mfg Co Ltd Air conditioner with deodorizing and antibacterial function
JP2000234894A (en) * 1999-02-12 2000-08-29 Zexel Corp Air-conditioning unit
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US6978793B1 (en) * 2003-05-21 2005-12-27 Phex Llc Portable cleaning apparatus and method for single pass plate and frame heat exchangers
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016091732A1 (en) * 2014-12-12 2016-06-16 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
WO2016091982A1 (en) * 2014-12-12 2016-06-16 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
WO2016092083A1 (en) * 2014-12-12 2016-06-16 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
US10228199B2 (en) 2014-12-12 2019-03-12 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
EP3483547A1 (en) * 2014-12-12 2019-05-15 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
US10928143B2 (en) 2014-12-12 2021-02-23 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
US11471921B2 (en) 2014-12-12 2022-10-18 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
US11480399B2 (en) 2014-12-12 2022-10-25 Koninklijke Philips N.V. Cooling apparatus for cooling a fluid by means of surface water
WO2017125543A1 (en) * 2016-01-20 2017-07-27 Koninklijke Philips N.V. A device having surfaces and an anti-biofouling system comprising at least one anti-biofouling light source for emitting rays of anti-biofouling light
US10549831B2 (en) 2016-01-20 2020-02-04 Koninklijke Philips N.V. Device having surfaces and an anti-biofouling system comprising at least one anti-biofouling light source for emitting rays of anti-biofouling light
RU2732715C2 (en) * 2016-01-20 2020-09-22 Конинклейке Филипс Н.В. Device having surfaces and a biological fouling protection system comprising at least one source of antifouling light for emitting beams of anti-biofouling light

Also Published As

Publication number Publication date
EP2515950A4 (en) 2014-02-26
EP2515950A1 (en) 2012-10-31
SE534513C2 (en) 2011-09-13
SE0950999A1 (en) 2011-06-22

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