EP2306467A1 - Verfahren zum Auffangen von Material bei Trockeneisstrahlen - Google Patents

Verfahren zum Auffangen von Material bei Trockeneisstrahlen Download PDF

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Publication number
EP2306467A1
EP2306467A1 EP09012566A EP09012566A EP2306467A1 EP 2306467 A1 EP2306467 A1 EP 2306467A1 EP 09012566 A EP09012566 A EP 09012566A EP 09012566 A EP09012566 A EP 09012566A EP 2306467 A1 EP2306467 A1 EP 2306467A1
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EP
European Patent Office
Prior art keywords
hood
dry ice
sides
inner baffle
air
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.)
Granted
Application number
EP09012566A
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English (en)
French (fr)
Other versions
EP2306467B1 (de
Inventor
Tim Wigfall
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.)
Linde GmbH
Original Assignee
Linde GmbH
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Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Priority to AT09012566T priority Critical patent/ATE545136T1/de
Priority to EP09012566A priority patent/EP2306467B1/de
Publication of EP2306467A1 publication Critical patent/EP2306467A1/de
Application granted granted Critical
Publication of EP2306467B1 publication Critical patent/EP2306467B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
    • G21F9/005—Decontamination of the surface of objects by ablation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
    • 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
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/003—Removing abrasive powder out of the blasting machine

Definitions

  • the invention relates to a method and a device for capturing material that has been liberated during a dry ice cleaning decontamination process.
  • CO 2 decontamination processes have attracted considerable attention.
  • the CO 2 decontamination process has advantages of cleanliness, rapid decontamination speed, and not producing secondary wastes, thus it is frequently applied to various fields such as atomic piles, semiconductor fabrication, and optical and medical equipment.
  • CO 2 gas at a very low temperature passes through an orifice of a nozzle under conditions in which liquid phase and vapor phase coexist (pressure of 800 psi) to be dropped to 80 psi in pressure, a portion of high-pressure CO 2 gas (about 45 %) is converted into solid granules like snow. These granules consist of crystal particles of sub-micron units, and are blasted onto a subject which is to be decontaminated. This is a CO 2 snow-blasting decontamination process.
  • a CO 2 decontamination medium CO 2 snow or CO 2 pellets
  • a CO 2 decontamination medium CO 2 snow or CO 2 pellets
  • dry ice shall include powder, snow, particles, pellets of all sizes and shapes.
  • the drawback of the existing static solutions is that only relative small objects can be cleaned.
  • the drawbacks of the movable solutions are the impeded sight of the region of impact of the blasting jet and the handicap of bearing and moving the weight of the gun mounted collection device and associated extract hoses - this is particularly detrimental when the operator already has to wear heavy protective clothing for example in radioactive contaminated surroundings in nuclear plants or the nuclear industry.
  • the invention has particular relevance to decontamination procedures to be carried out in the nuclear industry but is also relevant to any application where the material that is liberated by cleaning is required to be captured.
  • the object can be accomplished by a method of one of the claims 1 - 3 or by a device of one of the claims 4 - 12.
  • the core idea of the invention is a moveable hood with suction adapters to the exhaust, which can be positioned on a part of the surface which has to be cleaned.
  • the hood is open on its top and allows independent movement of the blasting gun. The operator has only to hold and move the blasting gun and no further equipment and is able to see the area being cleaned during the operation. After a first area of the surface is cleaned, the hood is then moved to the next area and the cleaning is resumed.
  • the capture process makes use of the general air movements/turbulence/deflections generated by the cleaning process.
  • the extract system can be independently mounted and therefore exerts no additional physical load or strain on the blast gun operator. An area can be cleaned and then the extract manifod/hood moved to clean the next areas in a chessboard type fashion - adjoining square by square.
  • the invention also incorporates adjustable internal baffles which enable the control and distribution of air movement/velocities at the top and bottom of the device.
  • the system (adapters, hoses) can be linked to a particulate filtration system (such as a cyclone or hepafilter) to achieve the required particle size/capture/filtration profile.
  • a particulate filtration system such as a cyclone or hepafilter
  • the gas can be scrubbed using appropriate methods including cyclone and bag filter technologies.
  • the equipment is designed to be used when cleaning flat surfaces - in horizontal or vertical planes.
  • the equipment has been designed to be used as part of the general area nuclear decontamination process for buildings. It is designed to be portable and suitable for use by operators wearing nuclear environment PPE.
  • the static extract system offers the advantage of adding no additional weight to the dry ice blasting gun and, therefore, much less physical exertion for the operator.
  • the equipment can be configured to ensure that a negative pressure is maintained in the general working environment - and hence avoid the escape of contaminant material into the surrounding environment.
  • the system can include a "fail safe" pressure monitored link between the gun and the extract system - to protect against the creation of positive pressure within the general working environment, which could be a potential for contamination of surrounding areas.
  • the system will be configured such that the dry ice blasting equipment cannot be operated unless safety interlock signals are first satisfied - to confirm the function of the local extract and capture system.
  • the face velocities of the air curtain and the local capture source can be adjusted by means of both the extracted air volume and the internal baffle clearances within the capture hood.
  • the equipment will feature safety interlocks between exhaust systems and dry ice blasting equipment to ensure the gun can only be used when the extract system is active.
  • the design of the extract hood allows the operator of the blasting equipment to see the area whilst it is being cleaned - enabling him to judge the effectiveness and coverage of the blast cleaning operation.
  • the equipment will feature other interlocks including the performance of the filtration system (e.g. collection device full, filter “blinding” etc).
  • the air curtain can be created actively by an air supply blowing in air in designated directions or passively by a baffle within the hood that induces an air curtain by directing the flow of the sucked air in a desired way.
  • the air curtain is produced by air directed essentially perpendicular to the direction of the jet.
  • the internal baffle creates air movement which radiates from the outside to the center of the hood and is created nearby the top of the hood. This air movement creates a "curtain" which allows external air into the hood but confines the gases and particles within the hood so that they are entrained and removed by the exhaust system, hence avoiding the release of potentially contaminating materials.
  • the device is made out of an outer hood of an inner baffle which are arranged in such a way that a gap is created near the surface allowing the ablated material to be sucked into the hollow between the outer hood and the inner baffle.
  • a passive air curtain is made with the advantage that the operator needs no inlet or supply for pressurized air to produce the curtain.
  • the inner baffle is adjustable at will against the outer hood. This enables the gap between the inner baffle and the top of the outer hood to be varied, with the result of control of face/extraction velocities at the air curtain and local capture point.
  • the rollers will maintain a small but constant gap between the hood and the wall surface whilst the brushes will form a seal of this gap to reduce the likelihood of escape of air or dust between the device and the wall or surface which has to be cleaned.
  • the device can be of any shape, preferred are a round, oval or square shape of the outer hood and/or of the corresponding inner baffle. Round or oval shapes have the advantages of ease of handling.
  • the square form has the advantage that a rectangular confined region is cleaned and in a second step the next (adjacent) region which will be cleaned has also an square form. Therefore an entire area can be cleaned - in a chess board type pattern, field by field.
  • the suction adapter or adapters can be arranged wherever it seems appropriate.
  • they are arranged in the sides of the outer hood at a designed height, this optimizes the extract distribution within the hood and ensures that the baffle provides shielding to the cleaning jet - so as to minimize any distortion effects on it by the extracted air.
  • the surface can be cleaned step by step by positioning the device in a first location, cleaning the space which can be reached through the opening in the top of the hood and then transferring the device to an adjacent position where upon cleaning is then resumed.
  • This simple relocation is easy if a floor or another horizontal plain has to be cleaned.
  • a stand is used which allows the device to be positioned in new places step by step by relocating it to the neighboring site, and the next, and so on.
  • Another simple adaptation is by the use of rails and slides, so one that areas in one direction can be cleaned very efficiently.
  • For relocating in the other direction - preferably perpendicular to - wheels and brakes or another stand system with rail can be used.
  • the relocation of the cleaning hood can be made step by step or continuously. It can be made by hand (manually) or be automated using a motor.
  • the solution with a stand is especially designed for the use on vertical surfaces like walls.
  • Figure 1 shows a plan view of a device according to the invention for cleaning the surface 2.
  • the device consists of an hood 4 which is in this embodiment is of rectangular shape.
  • the hood has four suction adaptors 12 with suction hoses 14 leading to an exhaust manifold.
  • the hood 4 shows a rectangular opening on its top, through which we can look to the area of the surface 2 which can now be cleaned - confined by the chain dotted line.
  • the opening is of such an amplitude or dimension, that a blasting gun 10 for cleaning can be put in and moved in all directions, i.e. from left to the right and - in the image plain - from top to bottom.
  • Eight inclined lateral suction channels or funnels improve the flow of the waste gas to the adaptors 12.
  • FIG 2 shows the same embodiment in a sectional view.
  • the hood 4 is made out of side walls 6, which contain the suction adapters 12 which lead to suction hoses 14 and to the exhaust.
  • On the top of the hood there is a top wall 8 with the rectangular opening shown in Figure 1 .
  • the gun or nozzle 10 can be put and moved from the left to the right and from forward to backward to clean the surface 2.
  • it has the same shape as the hood 4, in this embodiment a rectangular shape.
  • the baffle 5 is arranged in such a height or distance from the surface 2, that air can be sucked out in two ways.
  • the first pathway is along the surface 2 and the second pathway is between the top wall 8 and the top of the baffle 5, whereby this stream of air generates a passive air curtain preventing the emission of gas and particles or released contaminants.
  • Brushes 22 seal the gap between the hood 6 and the surface 2.
  • Multidirectional rollers 23 maintain a small but constant gap between the hood 6 and the surface 2 .
  • FIG 3 shows a sketch of a second embodiment with an active air curtain.
  • the active air curtain is produced by outlet nozzles in the top region of the hood 4 which are supplied by the hose the pressurized air hoses 16 with pressurized air.
  • the air curtain on the top of the hood is preventing all material, which is released from the surface 2 to come in contact with the outer atmosphere.
  • Figure 4 shows a wall 20 which has to be cleaned.
  • a stand 18 is provided which allows the operator to position the hood at different (indexed) heights to define adjacent extracted areas where cleaning is to be performed.
  • the area that is about to be cleaned is located on the left side at the top.
  • the hood can be moved downward one field in a chess board type pattern to move the device to the next local extract area below. In this way, one vertical column of areas can be cleaned.
  • the mobile stand has indexed settings and can be placed static. It is also possible to use wheels for moving it horizontally along the wall/surface to the next column of areas to be cleaned.
  • Relocation of the hood can be done manually or by motor and step by step or continuously (with a speed appropriate for the operator to clean the whole surface).
  • the second embodiment with automated movement of the extract hood across the surface to be cleaned offers significant advantage, both in terms of operational efficiency/rate of clean, and also reduced manual handling/physical stress on the operator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Cleaning In General (AREA)
EP09012566A 2009-10-05 2009-10-05 Verfahren zum Auffangen von Material bei Trockeneisstrahlen Not-in-force EP2306467B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT09012566T ATE545136T1 (de) 2009-10-05 2009-10-05 Verfahren zum auffangen von material bei trockeneisstrahlen
EP09012566A EP2306467B1 (de) 2009-10-05 2009-10-05 Verfahren zum Auffangen von Material bei Trockeneisstrahlen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09012566A EP2306467B1 (de) 2009-10-05 2009-10-05 Verfahren zum Auffangen von Material bei Trockeneisstrahlen

Publications (2)

Publication Number Publication Date
EP2306467A1 true EP2306467A1 (de) 2011-04-06
EP2306467B1 EP2306467B1 (de) 2012-02-08

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EP09012566A Not-in-force EP2306467B1 (de) 2009-10-05 2009-10-05 Verfahren zum Auffangen von Material bei Trockeneisstrahlen

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EP (1) EP2306467B1 (de)
AT (1) ATE545136T1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016048192A1 (en) * 2014-09-25 2016-03-31 "Lascom" Limited Liability Company Dust and gas ejection valve
WO2017081730A1 (ja) * 2015-11-09 2017-05-18 日産自動車株式会社 表面処理装置および表面処理方法
CN108735325A (zh) * 2018-04-25 2018-11-02 中国核电工程有限公司 一种可移动式去除环境辐射污染的装置
WO2021259424A1 (de) * 2020-06-22 2021-12-30 Mycon Gmbh Verfahren zum kühlen und/oder zum trennen von verklebten bauteilen und/oder entfernen von kleberückständen von oberflächen sowie strahlvorrichtung hierfür
WO2022167386A1 (en) * 2021-02-04 2022-08-11 Soletanche Freyssinet S.A.S. Apparatus for contained decontamination

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145643A (en) * 1983-09-01 1985-04-03 Ishikawajima Harima Heavy Ind Method and apparatus for cleaning by abrasive blasting
EP0234365A1 (de) * 1986-02-21 1987-09-02 Balduf Verfahrenstechnik GmbH Einrichtung zur abrasiven Oberflächenbehandlung
FR2625700A1 (fr) * 1988-01-07 1989-07-13 Carboxyque Francaise Procede et installation pour le nettoyage de pieces par vibro-abrasion a l'aide d'abrasif sublimable
US5123207A (en) 1990-10-30 1992-06-23 Tti Engineering Inc. Mobile co2 blasting decontamination system
US5613509A (en) * 1991-12-24 1997-03-25 Maxwell Laboratories, Inc. Method and apparatus for removing contaminants and coatings from a substrate using pulsed radiant energy and liquid carbon dioxide
DE19926084A1 (de) 1999-06-08 2000-12-21 Fraunhofer Ges Forschung Absaugvorrichtung und Vorrichtung enthaltend eine Absaugvorrichtung
DE20308788U1 (de) 2003-06-04 2003-08-28 Univ Hannover Oberflächenbearbeitungsvorrichtung
US7097717B2 (en) 2001-11-23 2006-08-29 Korea Atomic Energy Research Institute Method and device for collecting particulate contaminants during CO2 blasting decontamination
US20080034522A1 (en) 2006-08-08 2008-02-14 Dale Gipson Vacuum dust collector brush assembly

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145643A (en) * 1983-09-01 1985-04-03 Ishikawajima Harima Heavy Ind Method and apparatus for cleaning by abrasive blasting
EP0234365A1 (de) * 1986-02-21 1987-09-02 Balduf Verfahrenstechnik GmbH Einrichtung zur abrasiven Oberflächenbehandlung
FR2625700A1 (fr) * 1988-01-07 1989-07-13 Carboxyque Francaise Procede et installation pour le nettoyage de pieces par vibro-abrasion a l'aide d'abrasif sublimable
US5123207A (en) 1990-10-30 1992-06-23 Tti Engineering Inc. Mobile co2 blasting decontamination system
US5613509A (en) * 1991-12-24 1997-03-25 Maxwell Laboratories, Inc. Method and apparatus for removing contaminants and coatings from a substrate using pulsed radiant energy and liquid carbon dioxide
DE19926084A1 (de) 1999-06-08 2000-12-21 Fraunhofer Ges Forschung Absaugvorrichtung und Vorrichtung enthaltend eine Absaugvorrichtung
US7097717B2 (en) 2001-11-23 2006-08-29 Korea Atomic Energy Research Institute Method and device for collecting particulate contaminants during CO2 blasting decontamination
DE20308788U1 (de) 2003-06-04 2003-08-28 Univ Hannover Oberflächenbearbeitungsvorrichtung
US20080034522A1 (en) 2006-08-08 2008-02-14 Dale Gipson Vacuum dust collector brush assembly

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016048192A1 (en) * 2014-09-25 2016-03-31 "Lascom" Limited Liability Company Dust and gas ejection valve
CN106714976A (zh) * 2014-09-25 2017-05-24 拉斯科姆有限公司 灰尘气体喷射阀
US20170232461A1 (en) * 2014-09-25 2017-08-17 "Lascom" Limited Liability Company Dust and gas ejection valve
WO2017081730A1 (ja) * 2015-11-09 2017-05-18 日産自動車株式会社 表面処理装置および表面処理方法
CN108735325A (zh) * 2018-04-25 2018-11-02 中国核电工程有限公司 一种可移动式去除环境辐射污染的装置
WO2021259424A1 (de) * 2020-06-22 2021-12-30 Mycon Gmbh Verfahren zum kühlen und/oder zum trennen von verklebten bauteilen und/oder entfernen von kleberückständen von oberflächen sowie strahlvorrichtung hierfür
WO2022167386A1 (en) * 2021-02-04 2022-08-11 Soletanche Freyssinet S.A.S. Apparatus for contained decontamination

Also Published As

Publication number Publication date
ATE545136T1 (de) 2012-02-15
EP2306467B1 (de) 2012-02-08

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