WO2016085385A1 - Liquid treatment apparatus including an oversized lamp protecting sleeve - Google Patents
Liquid treatment apparatus including an oversized lamp protecting sleeve Download PDFInfo
- Publication number
- WO2016085385A1 WO2016085385A1 PCT/SE2015/051222 SE2015051222W WO2016085385A1 WO 2016085385 A1 WO2016085385 A1 WO 2016085385A1 SE 2015051222 W SE2015051222 W SE 2015051222W WO 2016085385 A1 WO2016085385 A1 WO 2016085385A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lamp
- liquid
- sleeve
- treatment
- treatment apparatus
- Prior art date
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 78
- 238000005086 pumping Methods 0.000 claims description 13
- 230000004931 aggregating effect Effects 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000003302 UV-light treatment Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
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
-
- 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
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
-
- 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
-
- 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
- C02F2201/3223—Single elongated lamp located on the central axis of a turbular reactor
-
- 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
- C02F2201/326—Lamp control systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
-
- 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
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
Definitions
- LIQUID TREATMENT APPARATUS INCLUDING AN OVERSIZED LAMP PROTECTING SLEEVE
- the present invention relates to a liquid treatment apparatus according to the preamble of the independent claim.
- UV light sources are used for treating liquids.
- the applicant of the present application has developed and is selling water treatment equipment having a water purifier comprising an elongated tubular treatment chamber with an inlet and an outlet.
- a light generally tubular quartz glass is arranged and inside the quartz glass a UV source, such as a lamp capable of generating wavelengths in the UV region.
- UV sources such as a lamp capable of generating wavelengths in the UV region.
- Low pressure UV lamps offer great efficiency and find particular application e.g. in the disinfection of water. Examples of different types of low pressure lamps include e.g. ozone-free mercury low pressure lamps, mercury ozone-generating low pressure lamps, and U-shaped lamps which supply high power in a compact design.
- the inner surface of the treatment chamber of the water treatment equipment may be covered with catalytic material, such as titanium dioxide, which catalysts promotes and increases the amount of treatment material.
- the treatment equipment also comprises a pumping device which pumps liquid from the tank into the treatment chambers.
- One type of treatment reactor developed by the applicant comprises a treatment chamber having oppositely arranged in- and outlets, where the UV light sources are arranged in elongated quartz glass tubes. These tubes are arranged perpendicular to the flow of liquid to be treated through the treatment chamber.
- US-5625194 relates to an apparatus for continuous cleaning of tubular lamp wells for UV- light producing lamps.
- US-7425272 relates to a system for cleaning protective sleeves in UV decontamination systems.
- the disclosed system for cleaning the outer surface of a quartz sleeve is based on the recognition that providing a honing material with a predetermined abrasiveness through the annulus at high velocity works to remove aggregated particles from the outer surface.
- the linear velocity of a slurry material passing through the annulus during a cleaning process is about 1 m/s, and in one particular example it is stated that the velocity is at least 0.5 m/s.
- GB-2070900, CN-202156942U, US-6162406, US-5124131 and US-5626768 relate to UV-radiation treatment systems and methods were a liquid is moved along a UV- radiation source.
- the liquid that is treated often comprises particles and other solid matter other than the organisms that are killed off by the treatment units. These particles, as well as other residue from the killed off organisms, have a tendency to stick on the interior surfaces of treatment units. These particles, and other residue, aggregated on the surface are generally denoted as fouling.
- UV light treatment more specifically UV-light in combination with heat, sometimes provokes chemical reactions resulting in depositions on the interior surfaces, e.g. at the outer surface of the quarts sleeve. These resulting depositions are generally denoted as scaling. Often scaling is more difficult to remove from the surface than fouling.
- cleaning is performed by injecting cleaning liquids into the treatment chamber, where the cleaning liquids are developed for removing the fouling or scaling on the surfaces.
- cleaning liquids are developed for removing the fouling or scaling on the surfaces.
- they are efficient for removing fouling/scaling and the like deposits on the surfaces of the treatment chambers, they require that the treatment units are closed down during a period of time, whereby thus no treatment of liquid may be performed.
- a liquid treatment apparatus configured for light treatment of a liquid flowing at a flow rate through at least one treatment chamber having a first end and a second end, wherein the treatment chamber is defined as a first elongated circumferential hollow cavity between an inner wall of a housing and an outer wall of a translucent sleeve arranged to protect and include a tube-shaped treatment lamp.
- the liquid treatment apparatus is applicable to any opaque liquids, such as non-purified water, cutting (working) liquid, liquids in the food industry, e.g. juice or the like.
- the lamp is arranged with regards to the sleeve such that a second elongated
- the circumferential hollow cavity is defined and the radial distance (e) between the outer wall surface of the lamp and the inner wall surface of the sleeve is at least about 4 mm, such as about 4-20 mm, thereby providing for a decrease of any fouling and/or scaling of the outer wall surface of the sleeve caused by light treatment.
- an oversized sleeve is provided herein having a larger diameter than conventional sleeves.
- an inner diameter of a sleeve (f) according to the present invention is at least about 36 mm, such as about 36-50 mm.
- a typical outer diameter of a lamp used in an apparatus provided herein is about 19-25 mm.
- the radial distance between the outer surface of the lamp and the inner surface of sleeve is normally about 2-3 mm.
- this radial distance is larger and at least about 5, 6, 7, 8, 9 or 10 mm, such as within the range of about 5-20 mm, 5-15 mm, 5-10 mm, 6-20 mm, 6-15 mm, 6-10 mm, 7- 20 mm, 7-15 mm, or 7-10 mm.
- the radial distance (e) need not be constant throughout the second elongated circumferential hollow cavity defined herein, but may vary slightly if the lamp is not in a centred position within the sleeve.
- the light intensity at the sleeve surface is decreased resulting in an environment which is less favourable for scaling and/or fouling.
- advantageous effects resulting in decreasing of the build-up rate of fouling and/or scaling at the sleeve surface may be obtained.
- the lamp is in some embodiments arranged with regards to the sleeve such that a second elongated circumferential hollow cavity is defined that is provided with an essentially constant radial distance (e), i.e. wherein the lamp is centred within the sleeve.
- the radial distance (e) is essentially constant throughout the second elongated circumferential hollow cavity.
- a liquid treatment apparatus may use higher fluid rate velocity to further decrease the build-up rate of fouling and/or scaling at the sleeve surface.
- Figure 1 is a schematic illustration of a liquid treatment apparatus according to the present invention further illustrating how the liquid flows from the tank through the apparatus and back to the tank after the treatment.
- Figure 2 is a schematic illustration of a liquid flow through a pumping device and treatment chamber/treatment equipment of the liquid treatment apparatus according to the present invention.
- Figure 3 is a cross-sectional view of a treatment chamber according to an embodiment of the present invention.
- Figure 4 is a perspective view of a liquid treatment apparatus according to an embodiment of the present invention.
- Figure 5 is a front view of a liquid treatment apparatus of an embodiment according to the present invention.
- Figure 6 is a schematic illustration of a liquid flow in a treatment chamber of a liquid treatment apparatus according to the invention.
- Figure 7 is a cross-sectional view schematically illustrating a treatment chamber according to the invention.
- Figure 8 is a cross-sectional view schematically illustrating a treatment chamber of a liquid treatment apparatus according to the invention.
- Figure 9 is a cross-sectional view of the upper parts of two treatment chambers of an embodiment according to the invention.
- Figure 10 is a cross-sectional view of the lower part of one treatment chamber of an embodiment according to the invention.
- the present invention relates to a liquid treatment apparatus 2 intended for treating a liquid 4, e.g. cutting liquid, with UV-light.
- the apparatus will now be described with references to figures 1-5.
- the apparatus is configured for light treatment of a liquid 4 flowing through at least one, preferably vertically arranged, treatment chamber 6 having an upper, or first, end 8 and a lower, or second, end 10. More specifically, the treatment equipment 9 is arranged to perform UV-light treatment of the liquid 4.
- the treatment chamber 6 is defined as a first elongated circumferential hollow cavity 13 between an inner wall 12 of a housing 14 and an outer wall 16 of a translucent sleeve 18 arranged to protect and include a lamp 20.
- the lamp 20 is a UV-lamp of a fluorescent tube type.
- the lamp 20 is also a low pressure lamp.
- the lamp has preferably an elongated shape in the form of a tube and having an essentially circular cross-section.
- the distance d between the inner wall 12 and the outer wall 16 is chosen, among other things, in dependence of different parameters of the liquid (e.g. the opacity) and is normally in the range of 2-10 mm.
- An exemplary length of the elongated treatment chamber is in the range of 150-200 cm.
- the liquid treatment apparatus also comprises a pumping device 3 configured to pump the liquid to be treated from a tank 25 via a tube, e.g. a flexible tube, into the at least one treatment chamber 6.
- the pumping device 3 has an inlet connection 22 (see figures 4 and 5) through which the liquid 4 is sucked from a tank 25 with liquid 4 to be treated and further to the treatment chamber 6.
- the pumping device 3 can also be arranged downstream of the treatment chamber 6.
- the liquid 4 flows, at a flow rate velocity, through the treatment chamber(s) 6 where it is subjected to UV-radiation.
- the treated liquid 4 is then returned to the tank 25 via another tube.
- the pumping device 3 is configured to flow said liquid 4 through the hollow cavity 13 at a velocity such that the velocity of the fluid 4 in relation to the outer surface of the sleeve 16 prevents fouling and/or scaling from aggregating on the outer surface of the sleeve 16.
- a recirculation assembly 42 is configured to recirculate the fluid through the hollow cavity 13.
- FIG 4 is a front view
- figure 5 is a perspective view of a liquid treatment apparatus 2 according to one embodiment of the present invention.
- the apparatus includes a mounting socket 38 on which the pumping device 3, an optional air trap vessel 5 and treatment equipment 9 are mounted.
- the treatment equipment 9 including treatment chambers 6, e.g. two or four, is mounted within a protective enclosure.
- a control panel 29 is provided at the front side of the enclosure, and also a safety disconnector 27.
- Inlet and outlet connectors 22, 35 are arranged for connection to tubes to the tank with the liquid to be treated.
- Electrical connectors are provided for electrical supply of the UV-lamps.
- the apparatus is controlled by a control unit 7, e.g. a dedicated processing device or a computer, via control instructions applied via the control panel 29.
- a liquid treatment apparatus 2 configured for light treatment of a liquid 4 flowing at a flow rate through at least one treatment chamber 6 having a first end 8 and a second end 10, the treatment chamber 6 is defined as a first elongated circumferential hollow cavity 13 between an inner wall 12 of a housing 14 and an outer wall 16 of a translucent sleeve 18 arranged to protect and include a tube- shaped treatment lamp 20.
- the lamp 20 is arranged with regard to the sleeve 18 such that a second elongated circumferential hollow cavity 15 is defined.
- the radial distance (e) between the outer wall surface of the lamp 20 and the inner wall surface 19 of the sleeve 18 is at least about 5, 6, 7, 8, 9 or 10 mm, such as about 5-20 mm, 6-20 mm, or 7-20 mm.
- the radial distance (e) between the outer wall surface of the lamp 20 and the inner wall surface 19 of the sleeve 18 is essentially constant throughout the second elongated circumferential hollow cavity 15 to provide for a uniform light intensity through the sleeve 18.
- the radial distance (e) is optimized with regard to preventing fouling and/or scaling of the outer wall surface 16 of the sleeve 18 by light treatment.
- An inner diameter (f) of the sleeve 18 is at least about 36 mm, such as about 36-50 mm.
- FIG 7 there is provided a horizontal cross-sectional schematic illustration of a treatment chamber 6 according to one embodiment of the invention.
- the lamp 20 is positioned within the treatment chamber 6 optionally by virtue of at least one positioning member 41 (see fig. 8) thereby providing the second elongated circumferential hollow cavity 15 within the sleeve 18.
- the radial distance (e) is defined between the outer surface of the lamp 20 and the inner surface 19 of the sleeve 18.
- the liquid treatment apparatus 2 comprises at least one positioning member 41, 51, 45 configured to position and/or centre the treatment lamp 20 within the sleeve 18.
- the apparatus may further comprise at least one positioning member 41, 51, 45 in connection to each respective end of said lamp 20.
- the positioning member 41, 51, 45 being configured to position and/or centre the treatment lamp 20 within the sleeve 18.
- the centring of the treatment lamp 20 is with regards to a longitudinal symmetry axis A of the sleeve 18.
- the at least one positioning member 41, 51 may be arranged on any suitable location(s) along the outer surface of the lamp, and/or in connection to the front end of the lamp 20 as schematically illustrated in figure 8 (positioning member 45).
- Positioning members 41, 51 are preferably arranged at an outer surface of the lamp 20 facing the inner surface of the sleeve 19, and are e.g.
- Positioning members 41, 51, 45 are further configured to provide respective damping elastic forces to the lamp, wherein positioning member 45 damps the lamp 20 with regard to a longitudinal symmetry axis A of the sleeve 18.
- Positioning members 41, 51, 45 is/are preferably made from an elastic rubber material.
- positioning members 41, 51 further improves protection of the lamp 20 during transportation in that the lamp 20 is held in position when the liquid treatment apparatus 2 is subjected to movements, e.g. during transportation, by damping movements in the radial direction.
- Positioning member 45 support positioning members 41, 51 in the positioning and/or centring of the lamp 20 within the sleeve by providing elastic forces to the lamp to hold it in position within the sleeve 18.
- a force generating member 44 may be positioned in close proximity to the first end of the lamp 20 applying a force directed downwards to the lamp to position and firmly hold the lamp 20 within the sleeve 18, i.e. in an axial direction of the lamp 20.
- the force generating member 44 may be a spring, such as a helical metal spring.
- An embodiment of the force generating member 44 is shown in figure 9 and 10.
- the liquid treatment apparatus 2 comprises a pumping device 3 which may be configured to be controlled by a control unit 7 to pump the liquid 4 to be treated at a controllable flow rate, wherein the flow rate is determined e.g. in dependence of the radial distance (e).
- the pumping device 3 is configured to flow the liquid 4 through the first hollow cavity 13 at a velocity such that the velocity of the liquid 4 in relation to the outer surface 16 of the sleeve 18 prevents fouling and/or scaling from aggregating on the outer surface 16 of the sleeve 18.
- the apparatus 2 further comprises a recirculation assembly 42 configured to recirculate the liquid 4 through the first hollow cavity 13.
- the pumping device 3 of a liquid treatment apparatus 2 provided herein is configured to flow the liquid 4 at a velocity of at least about 3 meters per second (m/s) through the treatment chambers.
- Figures 9 and 10 provide an embodiment of the invention, further illustrating a possible arrangement of positioning members 41, 51, 45 configured to position and/or centre the lamp 20 within the sleeve 18.
- Figure 9 shows an upper part 8 of a treatment chamber 6, wherein the positioning member 41 is provided as an elastic rubber ring.
- Figure 10 shows a lower part 10 of the treatment chamber 6 wherein the positioning member 51 is provided as an elastic rubber ring.
- Positioning member 45 in figure 10 is configured to provide a front support for the lamp 20 within the sleeve 18 and is preferably made from a rubber material.
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- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
Abstract
A liquid treatment apparatus (2), configured for light treatment of a liquid (4) flowing at a flow rate through at least one treatment chamber (6) having a first end (8) and a second end (10), the treatment chamber (6) is defined as a first elongated circumferential hollow cavity (13) between an inner wall (12) of a housing (14) and an outer wall (16) of a translucent sleeve (18) arranged to protect and include a tube-shaped treatment lamp (20). The lamp (20) is arranged with regard to the sleeve (18) such that a second elongated circumferential hollow cavity (15) is defined. The radial distance (e) between the outer wall surface of the lamp (20) and the inner wall surface (19) of the sleeve (18) is at least about 4 mm, such as about 4-20 mm, wherein the radial distance (e) is optimized with regard to preventing fouling/scaling of the outer wall surface (16) of the sleeve (18) caused by the light treatment.
Description
LIQUID TREATMENT APPARATUS INCLUDING AN OVERSIZED LAMP PROTECTING SLEEVE
Technical field
The present invention relates to a liquid treatment apparatus according to the preamble of the independent claim.
Background
There are many applications where UV light sources are used for treating liquids. The applicant of the present application, Wallenius Water AB in Sweden, has developed and is selling water treatment equipment having a water purifier comprising an elongated tubular treatment chamber with an inlet and an outlet. In the center of the treatment chamber a light generally tubular quartz glass is arranged and inside the quartz glass a UV source, such as a lamp capable of generating wavelengths in the UV region. Low pressure UV lamps offer great efficiency and find particular application e.g. in the disinfection of water. Examples of different types of low pressure lamps include e.g. ozone-free mercury low pressure lamps, mercury ozone-generating low pressure lamps, and U-shaped lamps which supply high power in a compact design.
The inner surface of the treatment chamber of the water treatment equipment may be covered with catalytic material, such as titanium dioxide, which catalysts promotes and increases the amount of treatment material. The treatment equipment also comprises a pumping device which pumps liquid from the tank into the treatment chambers.
One type of treatment reactor developed by the applicant comprises a treatment chamber having oppositely arranged in- and outlets, where the UV light sources are arranged in elongated quartz glass tubes. These tubes are arranged perpendicular to the flow of liquid to be treated through the treatment chamber.
Similar arrangements are also described by others within the field as exemplified by the following.
US-5625194 relates to an apparatus for continuous cleaning of tubular lamp wells for UV- light producing lamps.
US-7425272 relates to a system for cleaning protective sleeves in UV decontamination systems. The disclosed system for cleaning the outer surface of a quartz sleeve is based on the recognition that providing a honing material with a predetermined abrasiveness through the annulus at high velocity works to remove aggregated particles from the outer surface. In US-7425272 the linear velocity of a slurry material passing through the annulus during a cleaning process is about 1 m/s, and in one particular example it is stated that the velocity is at least 0.5 m/s.
Also GB-2070900, CN-202156942U, US-6162406, US-5124131 and US-5626768 relate to UV-radiation treatment systems and methods were a liquid is moved along a UV- radiation source.
The liquid that is treated often comprises particles and other solid matter other than the organisms that are killed off by the treatment units. These particles, as well as other residue from the killed off organisms, have a tendency to stick on the interior surfaces of treatment units. These particles, and other residue, aggregated on the surface are generally denoted as fouling.
UV light treatment, more specifically UV-light in combination with heat, sometimes provokes chemical reactions resulting in depositions on the interior surfaces, e.g. at the outer surface of the quarts sleeve. These resulting depositions are generally denoted as scaling. Often scaling is more difficult to remove from the surface than fouling.
Furthermore, uneven and lumped deposits of fouling and/or scaling on the interior surfaces of the devices that are even more difficult to remove are a commonly occurring problem.
This means that in order to have an optimum efficiency of the treatment device the interior has to be cleaned regularly. According to one solution in the prior art, cleaning is performed by injecting cleaning liquids into the treatment chamber, where the cleaning
liquids are developed for removing the fouling or scaling on the surfaces. However, even if they are efficient for removing fouling/scaling and the like deposits on the surfaces of the treatment chambers, they require that the treatment units are closed down during a period of time, whereby thus no treatment of liquid may be performed.
Hence, there is still a need in the art for improved liquid treatment apparatuses which are less prone to suffer from problems associated with scaling and/or fouling building up on the interiors of the apparatus during liquid treatment. Summary of the invention
The above-mentioned object is achieved, or at least mitigated, by the present invention according to the independent claim. Preferred embodiments are set forth in the dependent claims. Hence, there is provided herein a liquid treatment apparatus, configured for light treatment of a liquid flowing at a flow rate through at least one treatment chamber having a first end and a second end, wherein the treatment chamber is defined as a first elongated circumferential hollow cavity between an inner wall of a housing and an outer wall of a translucent sleeve arranged to protect and include a tube-shaped treatment lamp. The liquid treatment apparatus is applicable to any opaque liquids, such as non-purified water, cutting (working) liquid, liquids in the food industry, e.g. juice or the like.
The lamp is arranged with regards to the sleeve such that a second elongated
circumferential hollow cavity is defined and the radial distance (e) between the outer wall surface of the lamp and the inner wall surface of the sleeve is at least about 4 mm, such as about 4-20 mm, thereby providing for a decrease of any fouling and/or scaling of the outer wall surface of the sleeve caused by light treatment.
Hence, to overcome or at least mitigate some of the problems with similar arrangements in the art, an oversized sleeve is provided herein having a larger diameter than conventional sleeves. Accordingly, an inner diameter of a sleeve (f) according to the present invention
is at least about 36 mm, such as about 36-50 mm. In this respect, a typical outer diameter of a lamp used in an apparatus provided herein is about 19-25 mm.
Furthermore, in the prior art the radial distance between the outer surface of the lamp and the inner surface of sleeve is normally about 2-3 mm. However, according to the present invention, this radial distance is larger and at least about 5, 6, 7, 8, 9 or 10 mm, such as within the range of about 5-20 mm, 5-15 mm, 5-10 mm, 6-20 mm, 6-15 mm, 6-10 mm, 7- 20 mm, 7-15 mm, or 7-10 mm. In this respect, it should be noted that the radial distance (e) need not be constant throughout the second elongated circumferential hollow cavity defined herein, but may vary slightly if the lamp is not in a centred position within the sleeve.
Due to the increased sleeve surface area, the light intensity at the sleeve surface is decreased resulting in an environment which is less favourable for scaling and/or fouling. Hence, by arranging the lamp at an optimal distance from the outer surface of the sleeve, advantageous effects resulting in decreasing of the build-up rate of fouling and/or scaling at the sleeve surface may be obtained.
Furthermore, the lamp is in some embodiments arranged with regards to the sleeve such that a second elongated circumferential hollow cavity is defined that is provided with an essentially constant radial distance (e), i.e. wherein the lamp is centred within the sleeve. In such an embodiment, the radial distance (e) is essentially constant throughout the second elongated circumferential hollow cavity. As a result of the uniform light intensity provided through the centring of the lamp within the sleeve, any remaining fouling and/or scaling products will be more evenly distributed on the outer sleeve surface making them less difficult to remove therefrom.
In addition, a liquid treatment apparatus provided herein may use higher fluid rate velocity to further decrease the build-up rate of fouling and/or scaling at the sleeve surface.
Naturally, in order to achieve the required treatment effect, recirculation of the liquid is thereby required. Furthermore, it is preferred to use recirculation due to the lower light
intensity at the location for liquid treatment of an apparatus provided herein.
Short description of the appended drawings
Figure 1 is a schematic illustration of a liquid treatment apparatus according to the present invention further illustrating how the liquid flows from the tank through the apparatus and back to the tank after the treatment.
Figure 2 is a schematic illustration of a liquid flow through a pumping device and treatment chamber/treatment equipment of the liquid treatment apparatus according to the present invention.
Figure 3 is a cross-sectional view of a treatment chamber according to an embodiment of the present invention,
Figure 4 is a perspective view of a liquid treatment apparatus according to an embodiment of the present invention.
Figure 5 is a front view of a liquid treatment apparatus of an embodiment according to the present invention.
Figure 6 is a schematic illustration of a liquid flow in a treatment chamber of a liquid treatment apparatus according to the invention.
Figure 7 is a cross-sectional view schematically illustrating a treatment chamber according to the invention.
Figure 8 is a cross-sectional view schematically illustrating a treatment chamber of a liquid treatment apparatus according to the invention.
Figure 9 is a cross-sectional view of the upper parts of two treatment chambers of an embodiment according to the invention.
Figure 10 is a cross-sectional view of the lower part of one treatment chamber of an embodiment according to the invention.
Detailed description
The present invention will now be described with references to the appended figures.
Throughout the figures the same, or equivalent, items will have the same reference signs.
Generally, the present invention relates to a liquid treatment apparatus 2 intended for treating a liquid 4, e.g. cutting liquid, with UV-light. The apparatus will now be described with references to figures 1-5. The apparatus is configured for light treatment of a liquid 4 flowing through at least one, preferably vertically arranged, treatment chamber 6 having an upper, or first, end 8 and a lower, or second, end 10. More specifically, the treatment equipment 9 is arranged to perform UV-light treatment of the liquid 4. The treatment chamber 6 is defined as a first elongated circumferential hollow cavity 13 between an inner wall 12 of a housing 14 and an outer wall 16 of a translucent sleeve 18 arranged to protect and include a lamp 20.
Preferably, the lamp 20 is a UV-lamp of a fluorescent tube type. Preferably, the lamp 20 is also a low pressure lamp. The lamp has preferably an elongated shape in the form of a tube and having an essentially circular cross-section. The distance d between the inner wall 12 and the outer wall 16 is chosen, among other things, in dependence of different parameters of the liquid (e.g. the opacity) and is normally in the range of 2-10 mm. An exemplary length of the elongated treatment chamber is in the range of 150-200 cm.
The liquid treatment apparatus also comprises a pumping device 3 configured to pump the liquid to be treated from a tank 25 via a tube, e.g. a flexible tube, into the at least one treatment chamber 6. The pumping device 3 has an inlet connection 22 (see figures 4 and 5) through which the liquid 4 is sucked from a tank 25 with liquid 4 to be treated and further to the treatment chamber 6. The pumping device 3 can also be arranged downstream of the treatment chamber 6. The liquid 4 flows, at a flow rate velocity, through the treatment chamber(s) 6 where it is subjected to UV-radiation. The treated liquid 4 is then returned to the tank 25 via another tube. Preferably, the pumping device 3 is configured to flow said liquid 4 through the hollow cavity 13 at a velocity such that the velocity of the fluid 4 in relation to the outer surface of the sleeve 16 prevents fouling and/or scaling from aggregating on the outer surface of the sleeve 16. A recirculation assembly 42 is configured to recirculate the fluid through the hollow cavity 13.
Figure 4 is a front view, and figure 5 is a perspective view of a liquid treatment apparatus 2 according to one embodiment of the present invention. The apparatus includes a
mounting socket 38 on which the pumping device 3, an optional air trap vessel 5 and treatment equipment 9 are mounted. The treatment equipment 9 including treatment chambers 6, e.g. two or four, is mounted within a protective enclosure. A control panel 29 is provided at the front side of the enclosure, and also a safety disconnector 27. Inlet and outlet connectors 22, 35 are arranged for connection to tubes to the tank with the liquid to be treated. Electrical connectors are provided for electrical supply of the UV-lamps. The apparatus is controlled by a control unit 7, e.g. a dedicated processing device or a computer, via control instructions applied via the control panel 29. With references to in particular figures 6-10, the present invention, and various embodiments, will now be described in detail.
In one aspect, there is provided a liquid treatment apparatus 2 (see figure 6), configured for light treatment of a liquid 4 flowing at a flow rate through at least one treatment chamber 6 having a first end 8 and a second end 10, the treatment chamber 6 is defined as a first elongated circumferential hollow cavity 13 between an inner wall 12 of a housing 14 and an outer wall 16 of a translucent sleeve 18 arranged to protect and include a tube- shaped treatment lamp 20. The lamp 20 is arranged with regard to the sleeve 18 such that a second elongated circumferential hollow cavity 15 is defined. The radial distance (e) between the outer wall surface of the lamp 20 and the inner wall surface 19 of the sleeve 18 is at least about 5, 6, 7, 8, 9 or 10 mm, such as about 5-20 mm, 6-20 mm, or 7-20 mm. In some embodiments, the radial distance (e) between the outer wall surface of the lamp 20 and the inner wall surface 19 of the sleeve 18 is essentially constant throughout the second elongated circumferential hollow cavity 15 to provide for a uniform light intensity through the sleeve 18. The radial distance (e) is optimized with regard to preventing fouling and/or scaling of the outer wall surface 16 of the sleeve 18 by light treatment.
An inner diameter (f) of the sleeve 18 is at least about 36 mm, such as about 36-50 mm. In figure 7 there is provided a horizontal cross-sectional schematic illustration of a treatment chamber 6 according to one embodiment of the invention. The lamp 20 is positioned within the treatment chamber 6 optionally by virtue of at least one positioning
member 41 (see fig. 8) thereby providing the second elongated circumferential hollow cavity 15 within the sleeve 18. The radial distance (e) is defined between the outer surface of the lamp 20 and the inner surface 19 of the sleeve 18. Another embodiment of the apparatus is provided in figure 8. The liquid treatment apparatus 2 comprises at least one positioning member 41, 51, 45 configured to position and/or centre the treatment lamp 20 within the sleeve 18. The apparatus may further comprise at least one positioning member 41, 51, 45 in connection to each respective end of said lamp 20. The positioning member 41, 51, 45 being configured to position and/or centre the treatment lamp 20 within the sleeve 18. The centring of the treatment lamp 20 is with regards to a longitudinal symmetry axis A of the sleeve 18. It is to be understood that the at least one positioning member 41, 51 may be arranged on any suitable location(s) along the outer surface of the lamp, and/or in connection to the front end of the lamp 20 as schematically illustrated in figure 8 (positioning member 45). Positioning members 41, 51 are preferably arranged at an outer surface of the lamp 20 facing the inner surface of the sleeve 19, and are e.g. ring-shaped and made from an elastic rubber material. Positioning members 41, 51, 45 are further configured to provide respective damping elastic forces to the lamp, wherein positioning member 45 damps the lamp 20 with regard to a longitudinal symmetry axis A of the sleeve 18. Positioning members 41, 51, 45 is/are preferably made from an elastic rubber material.
Accordingly, positioning members 41, 51 further improves protection of the lamp 20 during transportation in that the lamp 20 is held in position when the liquid treatment apparatus 2 is subjected to movements, e.g. during transportation, by damping movements in the radial direction. Positioning member 45 support positioning members 41, 51 in the positioning and/or centring of the lamp 20 within the sleeve by providing elastic forces to the lamp to hold it in position within the sleeve 18.
As further illustrated in figure 8, a force generating member 44 may be positioned in close proximity to the first end of the lamp 20 applying a force directed downwards to the lamp to position and firmly hold the lamp 20 within the sleeve 18, i.e. in an axial direction of
the lamp 20. The force generating member 44 may be a spring, such as a helical metal spring. An embodiment of the force generating member 44 is shown in figure 9 and 10.
As shown in figure 6, the liquid treatment apparatus 2 comprises a pumping device 3 which may be configured to be controlled by a control unit 7 to pump the liquid 4 to be treated at a controllable flow rate, wherein the flow rate is determined e.g. in dependence of the radial distance (e).
In some aspects, the pumping device 3 is configured to flow the liquid 4 through the first hollow cavity 13 at a velocity such that the velocity of the liquid 4 in relation to the outer surface 16 of the sleeve 18 prevents fouling and/or scaling from aggregating on the outer surface 16 of the sleeve 18. Preferably, the apparatus 2 further comprises a recirculation assembly 42 configured to recirculate the liquid 4 through the first hollow cavity 13. The pumping device 3 of a liquid treatment apparatus 2 provided herein is configured to flow the liquid 4 at a velocity of at least about 3 meters per second (m/s) through the treatment chambers.
It should be noted that in the cross-sectional views shown in figures 9-10 only parts and details relevant for the present invention are designated.
Figures 9 and 10 provide an embodiment of the invention, further illustrating a possible arrangement of positioning members 41, 51, 45 configured to position and/or centre the lamp 20 within the sleeve 18. Figure 9 shows an upper part 8 of a treatment chamber 6, wherein the positioning member 41 is provided as an elastic rubber ring. Figure 10 shows a lower part 10 of the treatment chamber 6 wherein the positioning member 51 is provided as an elastic rubber ring. Positioning member 45 in figure 10 is configured to provide a front support for the lamp 20 within the sleeve 18 and is preferably made from a rubber material.
The present invention is not limited to the above-described preferred embodiments.
Various alternatives, modifications and equivalents may be used. Therefore, the above embodiments should not be taken as limiting the scope of the invention, which is defined by the appending claims.
Claims
1. A liquid treatment apparatus (2), configured for light treatment of a liquid (4) flowing at a flow rate through at least one treatment chamber (6) having a first end (8) and a second end (10), the treatment chamber (6) is defined as a first elongated circumferential hollow cavity (13) between an inner wall (12) of a housing (14) and an outer wall (16) of a translucent sleeve (18) arranged to protect and include a tube-shaped treatment lamp (20),
c h a r a c t e r i z e d i n that the lamp (20) is arranged with regard to the sleeve (18) such that a second elongated circumferential hollow cavity (15) is defined, and wherein the radial distance (e) between the outer wall surface of the lamp (20) and the inner wall surface (19) of the sleeve (18) is at least about 5, 6, 7, 8, 9 or 10 mm, such as about 5-20 mm, 6-20 mm, or 7-20 mm.
2. A liquid treatment apparatus (2) according to claim 1, wherein an inner diameter of the sleeve (18) is at least about 36 mm.
3. The liquid treatment apparatus (2), according to any of claims 1-2, wherein the radial distance (e) between the outer wall surface of the lamp (20) and the inner wall surface (19) of the sleeve (18) is essentially constant throughout the second elongated circumferential hollow cavity (15).
4. The liquid treatment apparatus (2) according to any of claims 1-3, wherein said apparatus (2) comprises at least one positioning member (41, 51, 45) configured to position and/or centre said treatment lamp (20) within said sleeve (18), wherein the centring of the treatment lamp (20) is with regards to a longitudinal symmetry axis A of the sleeve (18).
5. The liquid treatment apparatus (2) according to claim 4, wherein said apparatus comprises at least one positioning member (41, 51, 45) in connection to each respective end of said lamp (20), said positioning member (41, 51, 45) being configured to position and/or centre said treatment lamp (20) within said sleeve (18), wherein the
centring of the treatment lamp (20) is with regards to a longitudinal symmetry axis A of the sleeve (18).
6. The liquid treatment apparatus (2) according to claim 4 or 5, wherein said positioning member (41, 51, 45) provides a damping elastic force to the lamp (20).
7. The liquid treatment apparatus (2) according to any of claims 1-6, wherein said apparatus (2) comprises a pumping device (3) configured to be controlled by a control unit (7) to pump said liquid (4) to be treated at a controllable flow rate, wherein said flow rate is determined in dependence of said radial distance (e).
8. The liquid treatment apparatus (2) according to any of claims 1-7, wherein said pumping device (3) is configured to flow said liquid (4) through the first hollow cavity (13) at a velocity such that the velocity of the liquid (4) in relation to the outer surface (16) prevents fouling and/or scaling from aggregating on the outer surface (16) of the sleeve (18), and wherein said apparatus (2) further comprises a recirculation assembly (42) configured to recirculate said liquid (4) through said first hollow cavity (13).
9. The liquid treatment apparatus (2) according to any of claims 7-8, wherein said pumping device (3) is configured to flow the liquid (4) at a velocity of at least about 3 meters per second (m/s).
10. The liquid treatment apparatus (2) according to any of claims 1-9, wherein said at least one treatment chamber (6) is vertically oriented.
11. The liquid treatment apparatus (2) according to any of claims 1-10, wherein said lamp (20) has an elongated shape in the form of a tube and having an essentially circular cross-section.
12. The liquid treatment apparatus (2) according to any of claims 1-11, wherein said treatment lamp (20) is a UV-lamp of a fluorescent tube type, preferably a low pressure UV lamp.
13. The liquid treatment apparatus (2) according to any of claims 1-12, wherein said treatment lamp (20) is a low pressure lamp.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE112015005371.9T DE112015005371T5 (en) | 2014-11-27 | 2015-11-16 | Oversized lamp protection sleeve containing liquid treatment device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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SE1451440-0 | 2014-11-27 | ||
SE1451440 | 2014-11-27 |
Publications (1)
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WO2016085385A1 true WO2016085385A1 (en) | 2016-06-02 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/SE2015/051222 WO2016085385A1 (en) | 2014-11-27 | 2015-11-16 | Liquid treatment apparatus including an oversized lamp protecting sleeve |
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DE (1) | DE112015005371T5 (en) |
WO (1) | WO2016085385A1 (en) |
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WO2018050894A1 (en) * | 2016-09-16 | 2018-03-22 | Plastic Omnium Advanced Innovation And Research | System and method for injecting an aqueous solution on-board a vehicle |
WO2018050895A1 (en) * | 2016-09-16 | 2018-03-22 | Plastic Omnium Advanced Innovation And Research | Demineralized water tank on board of a vehicle |
WO2018202825A1 (en) * | 2017-05-04 | 2018-11-08 | Plastic Omnium Advanced Innovation And Research | System and method for injecting an aqueous solution on-board a vehicle |
CN110461773A (en) * | 2017-02-17 | 2019-11-15 | 华轮水务创新有限公司 | liquid treatment system |
US11952293B2 (en) | 2019-03-07 | 2024-04-09 | International Water-Guard Industries Inc. | Apparatus for disinfecting a fluid |
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