• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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  • 优先权
    • 专利摘要:
    ABSTRACT Method for treating fluids containing amounts of tramp oil comprising the steps of placing a treatment unit inside a volume of fluid to be treated, which treatment unitcomprises a UV radiation member capable of emitting UV radiation, radiating saidvolume of fluid with UV radiation, whereby said UV radiation is capable of creatingradicals in said fluid, which radicals react with said tramp oil for causing it to polymerise and coagulate, rendering it easily separated from the cutting fluid. (Pig. 2)
    公开号:SE1150658A1
    申请号:SE1150658
    申请日:2011-07-11
    公开日:2013-01-12
    发明作者:Eva Aalander
    申请人:Wallenius Water Ab；
    IPC主号:
    专利说明:

    METHOD AND DEVICE FOR TREATING FLUIDS TECHNICAL FIELDThe present invention relates to a method and device for treating fluids and in particular a device for treating cutting fluids.
    BACKGROUND OF THE INVENTION There are a number of methods and devices on the market that are capable oftreating, and in particular purifying, liquids. ln many instances, members capable ofgenerating UV radiation are used in the treatment process, and in particular UVradiation of certain wave-lengths that can create different reaction components suchas ozone, hydrogen peroxide, radicals, to mention a few. ln order to increase theperformance of the cleaning process, some treatment devices are arranged withcatalysts that are capable of creating e.g. photo-catalytic reactions for producing the treatment components.
    The above mentioned treatment methods have a good performance when treatingliquids that possess a good transmissibility, i.e. the radiation from the UV generatingmembers can spread in the volume to be treated. The more the liquid becomes filledwith particles and the like matter increasing the opacity of the liquid, the more difficult it becomes to reach all parts of the volume of liquid to be treated.
    One area where treatment and purification of liquid is important is machining wherecutting fluids or coolants are used. Cutting fluids often comprise an emulsion of oiland water, where the water makes them susceptible to bacteria and other micro-organisms, leading to odours, and also leading to breaking down of the function ofthe cutting fluid and clogging of equipment and piping handling the cutting fluid.Further the cutting fluids become increasingly loaded with foreign matter from the machining during use. ln order to solve the problem, a few attempts have been made to purify cutting fluidswith technologies involving no chemicals, where some are attempting the use of UV radiation. The applicant ofthe present invention has developed a method for treating cutting fluids involving no chemicals. lnstead the cutting fluid is treated with UVradiation members that radiate a volume of cutting fluid, wherein the UV radiation iscapable of creating radicals in the cutting fluid, where the radicals react with matter in the fluid, thereby treating it.
    A common type of contamination in cutting fluids is tramp oil, also known as sump oil,which is unwanted oil that has mixed with cutting fluid. lt originates as lubrication oilthat seeps out from the slideways and washes into the coolant mixture, as theprotective film with which a steel supplier coats bar stock to prevent rusting, or ashydraulic oil leaks. ln extreme cases it can be seen as a film or skin on the surface of the coolant or as floating drops of oil.
    The tramp oil has a tendency to promote the growth of bacteria and other micro-organisms in the cutting fluid, functioning as a nutrient. This is very unfavourable forthe cutting fluid and makes the micro organism control much more difficult. Also thehandling/removal of the oil entails additional equipment. Skimmers are sometimesused to separate the tramp oil from the coolant. These are typically slowly rotatingvertical discs that are partially submerged below the coolant level in the mainreservoir. As the disc rotates the tramp oil clings to each side of the disc to bescraped off by two wipers, before the disc passes back through the coolant. Thewipers are in the form a channel that then redirects the tramp oil to a container where it is collected for disposal.
    There is thus a need for a treatment method and device that can handle the above aspects of treatment of cutting fluids.
    BRIEF DESCRIPTION OF THE INVENTIONThe aim of the present invention is to provide a method and device for treatingcutting fluids where any oil residues such as tramp oil in coolants can be handled such that growth of bacteria and micro-organisms in the cutting fluid are prevented.
    This aim is obtained by a method according to the independent patent claims.
    Preferable embodiments form the subject of the dependent claims.
    According to a man aspect of the invention it is characterised in a method for treatingfluids containing amounts of tramp oil comprising the steps of placing a treatment unitinside a volume of fluid to be treated, which treatment unit comprises a UV radiationmember capable of emitting UV radiation, radiating said volume of fluid with UVradiation, whereby said UV radiation is capable of creating radicals in said fluid, which radicals react with said tramp oil for causing it to polymerise.
    According to another aspect of the invention, said UV radiation is capable of creating photo-ionization effects in the fluid.
    According to a further aspect of the invention, said treatment unit further comprises aquartz glass of high purity positioned between said UV radiation member and saidfluid to be treated.
    According to yet an aspect of the invention, it further comprises the step of creating a flow in said fluid to be treated.
    There are a number of advantages with the present invention. The tramp oil iseffectively removed by conventional separation after polymerization and coagulationachieved by the treatment unit. This effectively prevents any tramp oil from adversely affecting the liquid and preventing any growth of bacteria and other micro-organisms.
    Thus the method according to the present invention both treats the liquid as suchremoving any bacteria and other micro-organisms directly as well as removing and/or destroying any tramp oil, without using any addition of chemicals and the like.
    These and other aspects of and advantages with the present invention will becomeapparent from the following detailed description and from the accompanying drawings.
    BRIEF DESCRIPTION OF THE DRAWINGSln the following detailed description of the invention, reference will be made to the accompanying drawings, of which Fig. 1 is a schematic side view of a treatment unit used in the present invention,Fig. 2 is a schematic side view of an environment where the present inventionmay be utilized, and Fig. 3 is a schematic side view of another embodiment of the present invention.
    DETAILED DESCRIPTION OF THE INVENTION The present invention relates on the use of a treatment unit 10 comprises at leastone radiation source 16 capable of creating radiation energy in the liquid. Theradiation source is preferably capable of creating radiation in the UV region, due to the positive effects that UV radiation possess. ln order to create a good treatment environment and in order to maximize thetreatment efficiency of the UV radiation, different measures are provided. One suchmeasure for the treatment unit 10 is to position a transparent glass cover 18 or wallbetween the UV radiation source 16 and the fluid 14 to be treated. In order to createa desired photo-ionisation effect, which is very effective in treating the liquid, theglass cover 18 is made of very pure quartz glass. Preferred wavelengths are in theregion of 100 nm to 220 nm, with preferable peaks between 170-190 nm. Thesehighly energetic wavelengths are absorbed by water molecules, causing homolysis of the water molecules with the formation of hydrogen atoms and hydroxyl radicals.
    The process will create radicals having highly oxidizing effects, which are used forbreaking down and decomposing any organic or biological material in the fluid.According to one aspect of the invention, the treatment unit, or preferably severaltreatment units 10, are placed in an enclosure or reactor 20, having an inlet 22 andan outlet 24 for the liquid to be treated to flow through the enclosure. The treatmentunits 10 are then positioned such in the enclosure that preferably the total volume ofliquid is exposed to UV radiation in order that the photo-ionisation occurs throughout the volume. According to Fig. 2, the treatment reactor 20 can be placed in a normal loop for the liquid between a storage tank 12 and a cutting machine 30 such as alathe, a miller, and the like, either before 20 or after 20' the cutting machine. lt is alsofeasible to only have a separate loop with the reactor 20" connected to the tank 12where the liquid is circulated and treated in the reactor. Further, it might beadvantageous to position a filter 26, such as a band filter or the like, after thetreatment reactor 20, which is capable of removing any coagulated tramp oil after the treatment in the treatment reactor 20.
    As an alternative, one or several treatment units can be positioned directly in the tank12 containing fluid 14 to be treated, Fig. 3. The volume 12 could e.g. be acompartment which is common in a cutting machine, where cutting fluid is used during machining for cooling and lubricating the machining process.
    As an extra feature, also creation of radicals by photo-catalytic processes is veryeffective for treating fluids. Hereby catalytic material is placed in the vicinity of the UVradiation sources such that the material is radiated, Fig. 3. The presence of photo-catalytic material increases or creates decomposing radicals. The photo-catalyticmaterial could be placed on suitable carriers 32 such as metal plates, meshes oreven attached to the surface of the surrounding glass. Suitable photo-catalytic materials include noble metals, Ti02, Si02, just to mention some.
    When a number of such units are placed in the volume of liquid to be treated, athorough treatment effect is obtained throughout the volume, cleaning the fluid andremoving any organic material. Additional functions may include stirrers 34, and/orbaffles that create and control flows in the fluid to be treated, either in the reactor or in the tank containing the liquid.
    According to a certain aspect the above mentioned treatment device produceshydroxyl radicals that are formed in the treatment process, which hydroxyl radicalsattack organic molecules by radical addition to the organic compound (unsaturated oraromatic) that contain a rr bond (1), by hydrogen abstraction of a saturated aliphatic compound (2), and by electron transfer in the formation of ions of a higher valance (s). ~ _ _ . . Y*- x* x Both hydrogen abstraction and radical addition produce reactive organic radicals.The organic radicals undergo subsequent oxidation forming carboxylic acids and hydro-peroxides.
    At oxidation of Iubricating oils the oxygenated by-products, such as carboxylic acidsand hydro-peroxides, are known to combine to form larger molecular species. Whena number of such molecules combine, the process is called polymerization, it resultsin the formation of large molecules of high molecular weight. Allowed to progress, polymerization continues to such an extent that a sticky sludge of high viscosity is formed. ln hydraulic systems this material is problematic causing clogging and fouling.
    However, in coolant systems with applied treatment according to the invention, theoxidation polymerization of tramp oil allows for separation of the unwanted tramp oil as coagulated sludge e.g. in a filtration system. lt is thus easy to collect and remove the coagulated tramp oil from the surface of thetreatment vessel or storage tank 12. This collection and removal may be performedby a number of different methods and devices. One is for example to use a scraperor the like member 36, Fig. 2, that is moved along the surface of the liquid, whichscraper removes any polymerized and coagulated oil due to the treatment. Anotherexample is shown in Fig. 3, where a conventional belt skimmer 38 is used, having anendless belt arranged vertical in the tank where the upwards moving part of the belt brings the coagulated oil with it from the surface of the liquid. lt is to be understood that the embodiments described above and shown in thedrawings only are to be regarded as non-limiting examples ofthe invention and that it may be modified in many ways within the scope ofthe patent claims.
    权利要求:
    Claims (1)
    [1] 1. Method for treating fluids containing amounts of tramp oil comprising the stepsof - placing a treatment unit inside a volume of fluid to be treated, whichtreatment unit comprises a UV radiation member capable of emitting UVradiation, - radiating said volume of fluid with UV radiation, whereby said UV radiation iscapable of creating radicals in said fluid, which radicals react with said trampoil for causing it to polymerise and coagulate, rendering it easily separated from the cutting fluid. _ Method according to claim 1, wherein said UV radiation is capable of creating photo-ionization effects in the fluid. Method according to claim 2, wherein said treatment unit further comprises aquartz glass of high purity positioned between said UV radiation member andsaid fluid to be treated. _ Method according to any of the preceding claims, further comprising the step of creating a flow in said fluid to be treated. Device for performing the steps of any of the claims 1 to 6. Device according to claim 5, wherein it further comprises a collection mechanism for collecting said polymerised tramp oil.
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    同族专利:
    公开号 | 公开日
    SE536849C2|2014-09-30|
    EP2546200A1|2013-01-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB356926A|1930-08-27|1931-09-17|Abraham Martin Herbsman|Improvements in and relating to the separation of the constituent phases of disperse systems|
    SE8001635L|1979-03-05|1980-09-06|Franz Bohnensieker|PROCEDURE FOR STERILIZING HEAVY SHOES AND DEVICE FOR PERFORMING THE PROCEDURE|
    DE4230798A1|1992-09-15|1994-03-17|Markus Roesch|Treatment appts. for machining coolant - includes multistage filter and UV irradiation unit|
    US5997812A|1996-06-20|1999-12-07|Coolant Treatment Systems, L.L.C.|Methods and apparatus for the application of combined fields to disinfect fluids|
    US6083387A|1996-06-20|2000-07-04|Burnham Technologies Ltd.|Apparatus for the disinfection of fluids|
    US6201355B1|1999-11-08|2001-03-13|Triton Thalassic Technologies, Inc.|Lamp for generating high power ultraviolet radiation|
    US20080257829A1|2007-04-23|2008-10-23|Bill Rippetoe|Method and apparatus for separating particles from liquids|
    EP2248538B1|2009-05-09|2016-03-16|Christian Kaushal|Method and device for UV processing liquids|
    法律状态:
    2020-03-03| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150658A|SE536849C2|2011-07-11|2011-07-11|Method for treating liquids containing leakage oil|SE1150658A| SE536849C2|2011-07-11|2011-07-11|Method for treating liquids containing leakage oil|
    EP12175559A| EP2546200A1|2011-07-11|2012-07-09|Method and device for treating fluids|
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