EP3822024A1 - Dispositif de traitement des surfaces avec de la neige carbonique et procédé de traitement des surfaces - Google Patents

Dispositif de traitement des surfaces avec de la neige carbonique et procédé de traitement des surfaces Download PDF

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Publication number
EP3822024A1
EP3822024A1 EP19209465.4A EP19209465A EP3822024A1 EP 3822024 A1 EP3822024 A1 EP 3822024A1 EP 19209465 A EP19209465 A EP 19209465A EP 3822024 A1 EP3822024 A1 EP 3822024A1
Authority
EP
European Patent Office
Prior art keywords
compressed air
dry ice
maximum
air source
source
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.)
Pending
Application number
EP19209465.4A
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German (de)
English (en)
Inventor
Robert Egger
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.)
Egger Powair Cleaning GmbH
Original Assignee
Egger Powair Cleaning GmbH
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 Egger Powair Cleaning GmbH filed Critical Egger Powair Cleaning GmbH
Priority to EP19209465.4A priority Critical patent/EP3822024A1/fr
Priority to PCT/EP2020/081751 priority patent/WO2021094364A1/fr
Publication of EP3822024A1 publication Critical patent/EP3822024A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B24C7/0053—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
    • B08B7/0092—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by cooling

Definitions

  • the invention relates to a device for dry ice treatment and in particular dry ice cleaning of surfaces and a corresponding method.
  • a dry ice blast is generated in each case, in which dry ice particles, such as dry ice pellets, are accelerated by means of compressed air to a speed of about 300 meters per second and shot at the surface to be cleaned, where they generate a punctual thermal shock.
  • the coating to be removed, in particular contaminants, on the surface to be cleaned contracts and the subsequent dry ice particles in connection with the kinetic energy contained therein causes the contamination to flake off.
  • the dry ice particles sublime immediately upon impact, leaving a dry surface.
  • Dry ice is made from liquid CO2.
  • liquid CO2 is expanded under controlled conditions. This physical process creates dry ice snow. This is pressed through an extruder plate into round, hard pellets, which have elongated grains with a diameter of 1.7 mm to 3.0 mm. Dry ice has a temperature of approx. -79 ° C.
  • Carbon dioxide is an odorless, non-flammable gas that is 1.5 times heavier than air.
  • the earth's atmosphere normally contains about 0.03% CO2.
  • CO2 is mainly a by-product of various chemical processes and is stored in tanks after extraction.
  • Dry ice blasting systems represent a modern alternative to conventional industrial cleaning methods. What is unique about the use of dry ice as a blasting agent is that dry ice particles change into gaseous form at the moment they hit the surface to be cleaned, i.e. sublime. This means that after treatment, the surface is left dry and clean, with no cleaning or abrasive residues. As it is a completely dry and electroless process, dry ice blasting can be used in areas where other processes are impossible. For example, electric motors and technical systems with electrical, pneumatic and hydraulic components can be cleaned without having to shut them down or dismantle them. In addition, dry ice blasting is suitable for a variety of other applications, such as cleaning machines, electrical installations, any surfaces and shapes.
  • the low temperature of the dry ice particles makes the surface brittle, leads to the formation of cracks and contributes to its detachment, since the bond between the surface and the surface below is reduced. This means that dry ice also gets under the surface - thermal effect.
  • Dry ice blasting can be seen as an alternative to high-pressure cleaning and other conventional blasting methods that use various blasting agents such as sand, water, glass or plastic granulate. It is ideal for removing glue, varnish, oil, grease, coal dust, soot, lubricants and bitumen.
  • a gas turbine comprises one or more compressor stages that compress the ambient air, a combustion chamber that burns fuel together with the compressed air, and one or more turbine stages to supply the compressors. The expanding combustion gases drive the turbine and result in a thrust for propulsion.
  • Jet engines usually have a turbofan, which is arranged upstream in front of the compressor stages and is much larger in diameter than the compressor stages.
  • the turbofan is also driven by the turbine stages and lets a considerable part of the air flowing through the engine as a whole flow past the compressor stages, the combustion chamber and the turbine stages as a so-called secondary air flow. This secondary air flow can significantly increase the efficiency of an engine and reduce the noise level.
  • the invention is based on the problem that when cleaning such jet engines or when cleaning corresponding gas turbine engines, care must be taken that the cleaning method used does not deposit any residues in the turbine to be cleaned.
  • the present invention is based on the object of specifying a device for dry ice treatment and, in particular, dry ice cleaning of surfaces, a broader application being possible while avoiding the disadvantages mentioned of the conventional dry ice blasting systems.
  • the invention is based on the object of specifying a device and a method for dry ice treatment and, in particular, dry ice cleaning of surfaces, with no residue whatsoever remaining after cleaning or treatment of the corresponding surface, so that the cleaning or treatment therapy can also be used for sensitive components, can be used in particular for components in clean room environments.
  • the object on which the invention is based is achieved by the subject matter of independent claim 1, with advantageous developments of the device according to the invention being specified in the corresponding dependent claims.
  • the object on which the invention is based is achieved by the subject matter of the independent patent claim 14.
  • the invention is based on the knowledge that the ambient air used to provide the compressed air required for the cleaning process contains foreign particles in the form of, for example, aerosols, pollen, insects, hydrocarbons from combustion-powered vehicles and from industry, as well as salts near the sea.
  • the ambient air with these particles is compressed as compressed air and used in the further dry ice treatment process.
  • the foreign substances contained in the ambient air are concentrated in the compressed air and applied with the dry ice particles to the surface to be treated / cleaned.
  • the foreign matter particles follow the path of the compressed air (compressed air) or the path of the dry ice particle-compressed air mixture and settle on the various surfaces / components in the area to be treated / cleaned.
  • This pollution leads, for example, to a change in the properties of the boundary layer air flow, for example of the compressor components in engines.
  • the pollution of a jet engine leads to a reduction in efficiency and thus to increased fuel consumption and increased pollution of the environment.
  • the invention relates in particular to a device for dry ice treatment and in particular for dry ice cleaning of surfaces, the device having a dry ice source for providing dry ice, in particular in the form of dry ice particles (granules or pellets), a mixing unit that is fluidly connected or connectable to the dry ice source and a with the mixing unit fluidly connected or connectable compressed air source for providing compressed air for the mixing unit.
  • the compressed air provided by the compressed air source and the dry ice provided by the dry ice source are used to generate a dry ice particle / compressed air mixture which can be applied to the surface to be treated for dry ice treatment and in particular for dry ice cleaning.
  • the compressed air source is assigned a conditioning unit for conditioning the compressed air provided to the mixing unit, in particular with regard to need or application on the size and concentration of solid particles still contained in the compressed air provided, with regard to the pressure dew point and / or the moisture content of the compressed air provided and / or with regard to a residual amount of oil aerosols and hydrocarbons that are still contained in the compressed air provided allowed to.
  • the second operating state of the conditioning device is selected in particular when the degree of purity is that to be provided by the compressed air source Compressed air must be particularly high in order to be able to effectively prevent foreign matter from getting into the area in which the dry ice technology is used during dry ice treatment.
  • the conditioning device has a filter device, the filter device having at least one pre-filter and at least one post-filter, wherein - depending on a selected operating state of the conditioning device - at least the at least one after-filter for compressed air processing is optionally or as required can be switched off.
  • the conditioning unit can optionally be operated in the above-mentioned cleanliness classes 01 to 03, it is possible to select the dry ice treatment of surfaces in areas where the corresponding cleanliness classes must be adhered to. In particular, no complex retrofitting or conversion of the device is necessary for this. Accordingly, the field of application of dry ice technology is even further enlarged in this further development.
  • the conditioning unit is designed to selectively set the pressure dew point of the compressed air provided by the compressed air source in order to prevent or at least reduce the penetration of moisture into the area where the dry ice technology is used.
  • the conditioning unit has at least one water separator that can optionally be switched on or off for compressed air preparation, at least one heat-regenerating absorption dryer that can be optionally switched on or off for compressed air preparation, at least one refrigeration dryer that can be switched on or off for compressed air preparation, and / or at least one membrane dryer, which can optionally be switched on or off for the preparation of compressed air, in particular with an integrated nanofilter.
  • the conditioning unit and / or compressed air source are / is designed to selectively set a purity of the compressed air provided by the compressed air source with regard to a total concentration of oil aerosols and hydrocarbons.
  • the compressed air source has an oil-lubricated, compressing compressor unit and an oil-free compressing compressor unit, depending on a selected purity of the compressed air to be provided by the compressed air source for compressing Intake air, either the oil-lubricated, compressing compressor unit or the oil-free compressing unit is controlled.
  • the conditioning unit prefferably has at least one coalescence filter that can be optionally switched on or off for compressed air preparation and / or at least one activated carbon filter that can be switched on or off for compressed air preparation to set a total oil concentration purity of the compressed air provided by the compressed air source.
  • the device has a control and / or regulating device for controlling and / or regulating the compressed air source and / or the conditioning unit assigned to the compressed air source in such a way that, with regard to the degree of purity, that of the compressed air source provided compressed air corresponds to a predetermined or determinable degree of purity.
  • the invention also relates to a method for treating surfaces, in particular for cleaning and / or refining surfaces, the previously discussed device according to the invention preferably being used for this purpose, and wherein the method includes the method step of providing dry ice, in particular in the form of dry ice particles, the method step of Providing compressed air, the method step of producing a dry ice particle / compressed air mixture from the provided dry ice and the provided compressed air, and the method step of applying the dry ice particle / compressed air mixture to the surface to be treated.
  • the compressed air provided for producing the dry ice particle-compressed air mixture is conditioned, specifically in particular as required or application-specific and in particular with regard to the size and concentration of solid particles still contained in the compressed air provided, with regard to the Pressure dew point and / or the moisture content of the compressed air provided and / or with regard to a residual amount of oil aerosols and hydrocarbons that may still be contained in the compressed air provided.
  • the schematically shown exemplary embodiment of the device 1 according to the invention has a dry ice source 2 for providing dry ice, in particular in the form of dry ice particles, a compressed air source 4 and a mixing unit 3, the mixing unit 3 being connected in terms of flow to the dry ice source 2 on the one hand and the compressed air source 4 on the other serves to generate a dry ice particle / compressed air mixture 14 from the dry ice provided by the dry ice source 2 and the compressed air provided by the compressed air source 4.
  • a conditioning unit 5 is also used, with which a dry ice particle / compressed air mixture 14 provided or to be provided by the mixing unit 3 can be adapted to application-specific conditions before the dry ice particle / compressed air mixture 14 is applied to the surface to be treated.
  • the dry ice source 2 shown schematically can have a device 1 for generating solid CO2 particles, this device 1 comprising, for example, a snow chamber which has an inlet for CO2 and a compressor for compressing CO2 snow located in the snow chamber.
  • this device 1 comprising, for example, a snow chamber which has an inlet for CO2 and a compressor for compressing CO2 snow located in the snow chamber.
  • the snow chamber is closed on one side by a matrix provided with openings.
  • the dry ice source 2 of the device 1 according to the invention has a storage container for storing dry ice particles the size of rice grains, so-called CO2 pellets.
  • the CO2 pellets are produced by taking liquid carbon dioxide from an insulated tank, in which the carbon dioxide is usually stored at a pressure between 12 and 22 bar, and releasing it to atmospheric pressure via nozzles in a snow chamber. When the liquid carbon dioxide is released, a mixture of CO2 snow and cold CO2 gas is created. The gas phase is separated from the CO2 snow and the CO2 snow is compressed using a compressor. A piston compressor, for example, is used for this purpose. The resulting block of dry ice is then pressed through a die to generate solid strands of CO2, which are then cut into pellets about the size of a grain of rice using a suitable breaking tool.
  • the dry ice particles provided by the dry ice source 2 are metered into a compressed air flow provided by the compressed air source 4 in the mixing unit 3 and conveyed with this to a jet nozzle.
  • the compressed air flow has a pressure between 0.1 bar to 24 bar, while the dry ice particles (CO2 pellets) are present at atmospheric pressure.
  • a pressure lock is preferably used, which is shown in the schematic drawing according to FIG FIG. 2 is not shown.
  • the dry ice particle-compressed air mixture 14 generated in the mixing unit 3 of the device 1 according to the invention is applied to the surface 12 to be treated, the dry ice particles in the dry ice particle-compressed air mixture 14 are accelerated with the aid of the compressed air provided by the compressed air source 4, and the dry ice particle compressed air flow is - as in FIG. 1a indicated - directed at the surface 12 to be cleaned or treated.
  • the compressed air source 4 is assigned a conditioning unit 5, in particular to condition the compressed air provided to the mixing unit 3 as required or as required, in particular with regard to the size and concentration of solid particles still contained in the compressed air provided , with regard to the pressure dew point and / or the moisture content of the compressed air provided and / or with regard to a residual amount of oil aerosols and hydrocarbons that may still be contained in the compressed air provided.
  • the conditioning unit 5 In order to set the degree of preparation of the compressed air to be provided by the compressed air source 4, the conditioning unit 5 has a large number of different operating states that can in particular be selected via a manual input device.
  • the conditioning unit 5 has a filter device 7 with a pre-filter and a post-filter. Depending on a selected operating state of the conditioning unit 5, the at least one post-filter for the preparation of compressed air can be switched on or off.
  • the conditioning unit 5 of the device 1 according to the invention is also designed to optionally set the pressure dew point of the compressed air provided by the compressed air source 4.
  • the conditioning unit 5 has at least one refrigeration dryer that can optionally be switched on or off for the preparation of compressed air.
  • a refrigeration dryer instead of such a refrigeration dryer, however, it is also conceivable that a water separator, an absorption dryer and / or a membrane dryer can be used.
  • the already mentioned filter device 7 is designed accordingly.
  • the compressed air source 4 has an oil-lubricated, compressing compressor unit and an oil-free compressing compressor unit, with either the oil-lubricated, compressing compressor unit or, depending on a selected purity of the compressed air to be provided by the compressed air source 4 for compressing intake air the oil-free compressor unit is controlled.
  • the device 1 has a control and / or regulating device 16 for controlling and / or regulating the compressed air source 4 and / or the conditioning unit 5 assigned to the compressed air source 4 in such a way that, with regard to the degree of purity, that of the compressed air source 4 provided compressed air corresponds to a predetermined or determinable degree of purity.
  • the compressed air source 4 of the device 1 not only serves to supply a predetermined or determinable amount of compressed air to the mixing unit 3 per unit of time, the amount of compressed air supplied to the mixing unit 3 per unit of time being in particular an amount of dry ice particles supplied to the mixing unit 3 per unit of time but also to meter a predetermined or determinable amount of compressed air per unit of time as additional compressed air 8 to the dry ice particle-compressed air mixture 14 generated by the mixing unit 3.
  • This additional compressed air 8 is used in particular to vary the jet pressure and / or to set a speed of the dry ice particle / compressed air mixture 14.
  • the compressed air source 4 is also designed to supply shaping air 9 to a manual or automatic spray gun 6, which is used to apply the conditioned dry ice particle-compressed air mixture 14 to the surface 12 to be treated, in order, for example, to form a sheath flow which the Dry ice particle-compressed air mixture 14 envelops and acts parallelizing or focusing.
  • the method according to the invention is used to optimally clean or treat the surface 12 without Foreign matter hits the surface 12 with the compressed air.
  • the low temperature of the sublimated dry ice leads to the formation of cracks in the covering 13 on the surface 12 to be treated and thus to the detachment of the covering 13.
  • a sublimation area 15 is preferably selected in the immediate vicinity of the surface 12, so that it is cleaned due to the sublimation effect or due to the explosion effect when the dry ice particles are sublimated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
EP19209465.4A 2019-11-15 2019-11-15 Dispositif de traitement des surfaces avec de la neige carbonique et procédé de traitement des surfaces Pending EP3822024A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19209465.4A EP3822024A1 (fr) 2019-11-15 2019-11-15 Dispositif de traitement des surfaces avec de la neige carbonique et procédé de traitement des surfaces
PCT/EP2020/081751 WO2021094364A1 (fr) 2019-11-15 2020-11-11 Dispositif de traitement de surfaces à la glace sèche et procédé de traitement de surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19209465.4A EP3822024A1 (fr) 2019-11-15 2019-11-15 Dispositif de traitement des surfaces avec de la neige carbonique et procédé de traitement des surfaces

Publications (1)

Publication Number Publication Date
EP3822024A1 true EP3822024A1 (fr) 2021-05-19

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EP19209465.4A Pending EP3822024A1 (fr) 2019-11-15 2019-11-15 Dispositif de traitement des surfaces avec de la neige carbonique et procédé de traitement des surfaces

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EP (1) EP3822024A1 (fr)
WO (1) WO2021094364A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005018952U1 (de) * 2005-12-02 2007-04-12 Kim Bettina Trockeneis-Strahlanlage
DE102010064406A1 (de) * 2010-12-30 2012-07-05 ipal Gesellschaft für Patentverwertung Berlin mbH Vorrichtung und Verfahren zum Partikelstrahlen mittels gefrorener Gaspartikel
WO2015079409A1 (fr) * 2013-11-27 2015-06-04 Atlas Copco Airpower N.V. Filtre à coalescence
US9446500B2 (en) * 2012-09-25 2016-09-20 G.D.O. Inc. Underwater abrasive entrainment waterjet cutting method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005018952U1 (de) * 2005-12-02 2007-04-12 Kim Bettina Trockeneis-Strahlanlage
DE102010064406A1 (de) * 2010-12-30 2012-07-05 ipal Gesellschaft für Patentverwertung Berlin mbH Vorrichtung und Verfahren zum Partikelstrahlen mittels gefrorener Gaspartikel
US9446500B2 (en) * 2012-09-25 2016-09-20 G.D.O. Inc. Underwater abrasive entrainment waterjet cutting method
WO2015079409A1 (fr) * 2013-11-27 2015-06-04 Atlas Copco Airpower N.V. Filtre à coalescence

Also Published As

Publication number Publication date
WO2021094364A1 (fr) 2021-05-20

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