EP2305425B1 - Dispositif de capture de matériau durant le sablage de glace sèche - Google Patents

Dispositif de capture de matériau durant le sablage de glace sèche Download PDF

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Publication number
EP2305425B1
EP2305425B1 EP20090012616 EP09012616A EP2305425B1 EP 2305425 B1 EP2305425 B1 EP 2305425B1 EP 20090012616 EP20090012616 EP 20090012616 EP 09012616 A EP09012616 A EP 09012616A EP 2305425 B1 EP2305425 B1 EP 2305425B1
Authority
EP
European Patent Office
Prior art keywords
outer shroud
dry ice
blasting
closed
gun
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.)
Not-in-force
Application number
EP20090012616
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German (de)
English (en)
Other versions
EP2305425A1 (fr
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 EP20090012616 priority Critical patent/EP2305425B1/fr
Publication of EP2305425A1 publication Critical patent/EP2305425A1/fr
Application granted granted Critical
Publication of EP2305425B1 publication Critical patent/EP2305425B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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 device and a method for capturing material during a dry ice blasting decontamination process.
  • CO 2 decontamination processes have attracted considerable attention.
  • the CO 2 decontamination process has advantages of cleanness, 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.
  • Disadvantages of the above processes are that particulate contaminants removed by the CO 2 decontamination medium are instantaneously diffused into the atmosphere by the blasting gas, and a freezing layer is formed on a surface of the contaminated subject because the temperature of the blasted CO 2 gas is very low, thus reducing decontamination efficiency of the contaminated subject.
  • the drawback of static solutions is that only relative small objects can be cleaned.
  • the drawbacks of the movable solutions are the impeded sight to the region of impact of the blasting jet and the handicap of having to carry the additional weight of the capture device and acssociated hoses, this is particularly detrimental when the operator already has to wear heavy protective clothing as in radioactive contaminated surroundings in nuclear plants or nuclear industry.
  • US 7,097,717 discloses a device with a shroud mounted directly onto the gun.
  • This device uses an air curtain flowing parallel to the blasting jet to prevent contaminated gas from diffusing into the atmosphere. Collection takes place in a collecting space nearby the gun and by special outside suction channels. The sucking gas stream near the jet leads to a widening of the jet and a decrease of the blasting performance of the jet.
  • the active air curtain needs an air supply with at least one additional hose, which is not very easy to handle in nuclear industry environments.
  • Document FR 2110527 discloses a method and a device for capturing of material during dry ice blasting.
  • the invention uses a sort of double shroud with an outer shroud, similar to the state of the art, and an inner shroud or baffle which protects the cleaning jet from being influenced by the exhaust extract stream. So the effect of the cleaning can be enhanced as more and faster ice particles impact and break or loosen the adhering contaminants from the cleaning surface.
  • the equipment is designed to be used when cleaning flat surfaces - in horizontal or vertical planes.
  • the equipment is designed to make use of the general air movements/turbulence and deflection that are generated by the cleaning process.
  • the extract system is portable and will be mounted onto the "stem" of the dry ice blasting gun. This arrangement gives the advantage of most efficient particulate capture due to maintained distance between the nozzle and the exhaust capture "duct", this has the effect of equalizing and maintaining exhaust entrainment velocities within the shroud.
  • One objective is to capture as much of the surface contamination material as possible which is liberated by the dry ice blasting process.
  • the exhaust gas and entrained particulates will be scrubbed using appropriate methods including cyclone and bag filter technologies as they are commonly known or used.
  • the system can be linked to a particulate filtration system (cyclone/hepafilter) to achieve the required particle size, capture or filtration profile.
  • Extract volumes will be determined by a combination of three factors: i) the volume of air that has to be removed to compensate for the air/carbon dioxide introduced by the cleaning process (so as to maintain a negative pressure within the shroud), ii) the amount of extract air required to form an effective "air curtain" seal between the shroud and the surface being cleaned iii) the amount of air to be introduced to create a suitable temperature in the exhaust gas to prevent cold temperatures arising that would cause damage to the extract/filtration equipment.
  • the equipment can feature safety interlocks between exhaust system and dry ice blasting equipment - to ensure the gun can only be used when the extract system is active.
  • the equipment includes the feature of a "sight" to enable the operator to judge the "sweep” of the blast and, therefore, enable effective cleaning of the entire surface.
  • the equipment comes with a variety of interchangeable "sights” that reflect a variety of nozzle cleaning patterns, hence allowing the operator to gauge where he or she is cleaning for optimum accuracy and efficiency in operation.
  • the equipment will feature other safety interlocks including the operation of the filtration system - for example if the collection device is full, or filter is blocking/ "blinding". In the event that there is a problem with the function of the filtration system then the interlock system will prevent the dry ice blasting gun from being operated.
  • the invention includes an internal baffle arrangement - this has several benefits including:
  • the invention illustration Figure 1 shows how exhaust gas temperature can be very easily modified by the use of a supplemental air inlet which is regulated using a rotating collar in the suction adapter. By turning the collar the area of the supplemental inlet air orifice is varied, hence allowing more or less air of room temperature into the exhaust stream via this bypass flow allowing the desired exhaust temperature to be achieved.
  • variable orifice collar in the exhaust gas line is advantageous because it allows temperature control without disturbance to optimized extract/capture volumes/velocities within the shroud.
  • variable orifice collar will be adjusted to allow the inlet of additional air into the exhaust gas stream with the benefit of warming it and preventing cold damage to the exhaust pipework/fan etc.
  • Exhaust pipework is particularly susceptible to cold damage because the nature of the blast cleaning process means that it is constantly being moved and flexed. When cold, materials that are subject to constant physical stress are very prone to fracture and failure (and hence the potential for release of the contaminant material into the general environment).
  • the equipment has brushes and multidirectional rollers to allow free movement of the shroud across the work surface whilst maintaining a constant but small gap to reduce the likelihood of escape of air or dust between the wall and the shroud surface.
  • Brushes, especially on the outer shroud wall, enable the best possible seal between the exhaust shroud and work piece during movement of the cleaning equipment.
  • the air, the CO2 and the released contaminants can be sucked out by one or more suction adapters.
  • the suction adapter or adapters can be arranged wherever it seems appropriate. Preferred is a central suction adapter in the middle of the top wall of the outer shroud, preferably pivotable. So the maneuverability is enhanced and the device can easy be moved in any direction. The central position also homogenizes the exhaust gas flow inside the shroud and avoids "dead spaces".
  • the device can be of any shape, preferred are a round, oval or square shape of the outer shroud and/or of the inner baffle corresponding. Round or oval shapes have the advantages of very easy handling.
  • the equipment is constructed to allow the dry ice blasting gun to be adjusted forwards/backwards to enable the optimum distance between the nozzle and clean surface to be set.
  • FIG. 1 shows an embodiment of an inventive device on a surface 2 to be cleaned.
  • the device is built up by a outer shroud 4 with side walls 6 and a top wall 8.
  • An inner baffle/shroud 14 is rigidly fixed to the outer shroud 4 with a predetermined gap between the two (to allow the passage of the exhaust gas to the extract 12).
  • the "stem" of the spray or blasting gun 10 passes through a cental orifice in the top of the outer 4 and inner shroud 14.
  • the shroud assembly 4,14 is held in position on the stem of the gun by an adjustable clamp 19 which is designed to allow the gun stem/nozzle assembly to slide in/out - to enable the distance between the nozzle and the surface to be optimized and then fixed in place.
  • the outer shroud 4 has on its top a central adapter 12 to exhaust where the gases (air and CO 2 ) and particles released are transported to the exhaust.
  • a supplemental air inlet 18 is foreseen, which can be opened or closed by a rotating collar 16 for letting additional by pass air into the exhaust stream.
  • the inner baffle 14 shields the jet which is directed to the surface 2 in a very effective manner (and hence prevents it from being distorted and dry ice from being sucked directly by the vacuum into the exhaust stream).
  • Brushes 22 seal the shroud 4 against the surface 2 and prevent the escape of released contaminants to the atmosphere. Multidirectional rollers 21 keep the desired distance.
  • Figure 2 shows schematically the same embodiment from a top view.
  • the side walls 6 of the outer shroud 4 confine the device.
  • the inner baffle 14 has the same shape as the outer shroud 4 and is rigidly fixed to it.
  • the exit face of the jet gun 10 is rectangular.
  • a pair of sights 20 are fixed to allow the operator to align the blasting equipment to ensure that the "sweep" of clean is aligned with the area that has already been cleaned - hence improving the effectiveness and speed of cleaning.
  • the dotted lines show lines of sight.
  • the gun mounted shroud/shroud and inner baffle that form part of the invention may be rectangular in cross section - as per the illustration, or if advantageous, may be of other shapes/form (bell-like etc) for advantageous flow of the exhaust gases.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)

Claims (7)

  1. Dispositif de capture de matériau au cours d'un processus de décontamination par sablage de glace sèche, comportant
    - un pistolet de sablage de glace sèche (10)
    - une enveloppe extérieure (4) ouverte vers la surface de nettoyage (2), fermée sur les côtés et ayant une ouverture en haut pour le pistolet de sablage (10) et un ou plusieurs adaptateurs d'aspiration(12)
    - une chicane intérieure (14) fixée rigidement à l'enveloppe extérieure (4) et montée sur la tige du pistolet pulvérisateur (10), ouverte vers la surface de nettoyage (2), fermée sur les côtés et fermée en haut, créant un espace près de la surface (2) pour permettre au matériau enlevé d'être aspiré à l'intérieur du creux entre l'enveloppe extérieure (4) et la chicane intérieure (14) et
    - une entrée d'air supplémentaire (18) sur l'enveloppe extérieure (4) pour laisser entrer de l'air de dérivation supplémentaire dans le flux d'échappement.
  2. Dispositif selon la revendication 1, caractérisé par des brosses (22) et/ou des rouleaux multidirectionnels (23) pour balayer en travers de la surface avec un dégagement prédéfini, et pour sceller le fond de l'enveloppe extérieure (4) à la surface (2).
  3. Dispositif selon la revendication 1 ou la revendication 2, caractérisé par un adaptateur d'aspirationcentral (12) dans le milieu de la paroi supérieure (8) de l'enveloppe extérieure (4), de préférence pivotant.
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par une forme ronde, ovale ou carrée de l'enveloppe extérieure (4) et/ou de la chicane intérieure (14).
  5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par un collier rotatif d'orifice variable (16) dans l'adaptateur d'aspiration(12).
  6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par un pistolet rétractable (10) pour fixer la distance correcte entre la buse et la surface de travail (2) en vue d'un effet de nettoyage optimal.
  7. Procédé de capture de matériau au cours d'un processus de décontamination par sablage de glace sèche utilisant une enveloppe extérieure (4) avec un ou plusieurs adaptateurs d'aspiration(12), caractérisé par l'utilisation d'une chicane intérieure (14) fermée sur les côtés et fermée en haut, la protection du jet de glace sèche pour empêcher qu'il soit dévié et l'encouragement de l'entraînement et de la capture des gaz de sablage et des matériaux particulaires libérés et l'utilisation d'une entrée d'air supplémentaire (18) sur l'enveloppe extérieure (4) pour laisser entrer de l'air de dérivation supplémentaire dans le flux d'échappement.
EP20090012616 2009-10-05 2009-10-05 Dispositif de capture de matériau durant le sablage de glace sèche Not-in-force EP2305425B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090012616 EP2305425B1 (fr) 2009-10-05 2009-10-05 Dispositif de capture de matériau durant le sablage de glace sèche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090012616 EP2305425B1 (fr) 2009-10-05 2009-10-05 Dispositif de capture de matériau durant le sablage de glace sèche

Publications (2)

Publication Number Publication Date
EP2305425A1 EP2305425A1 (fr) 2011-04-06
EP2305425B1 true EP2305425B1 (fr) 2012-11-21

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EP20090012616 Not-in-force EP2305425B1 (fr) 2009-10-05 2009-10-05 Dispositif de capture de matériau durant le sablage de glace sèche

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102335879A (zh) * 2011-09-30 2012-02-01 电子科技大学 一种干冰微粒喷射清洗装置及使用方法
US20130263890A1 (en) * 2012-03-20 2013-10-10 Mid-American Gunite, Inc. Cleaning of radioactive contamination using dry ice
CN105682856A (zh) 2013-10-22 2016-06-15 东曹Smd有限公司 经优化的纹理化表面及优化的方法
CN106714976A (zh) * 2014-09-25 2017-05-24 拉斯科姆有限公司 灰尘气体喷射阀
CN106425875B (zh) * 2016-11-08 2019-06-21 浙江工业大学 一种类人工关节件湍流加工过程中磨粒流的升温方法
US10719020B2 (en) * 2018-06-29 2020-07-21 Taiwan Semiconductor Manufacturing Co., Ltd. Droplet generator and method of servicing extreme ultraviolet radiation source apparatus
EP3984697A1 (fr) * 2020-10-15 2022-04-20 Linde GmbH Dispositif et procédé de nettoyage de surfaces au moyen de particules de co2
GB202101569D0 (en) * 2021-02-04 2021-03-24 Soletanche Freyssinet Sas Apparatus for contained decontamination
US20230366126A1 (en) * 2022-05-10 2023-11-16 Gerald Henrici Apparatus and method of orifice inspection and carbon dioxide cleaning thereof

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2110527A5 (fr) * 1970-10-09 1972-06-02 Bertoncini Gaston
US4095378A (en) * 1975-12-18 1978-06-20 Uragami Fukashi Device capable of suction-adhering to a wall surface and moving therealong
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
EP0569708B1 (fr) * 1992-04-15 2003-10-15 Air Products And Chemicals, Inc. Appareil de nettoyage de surfaces solides par aerosol cryogénique
US5695389A (en) * 1996-01-11 1997-12-09 Inventive Machine Corporation Blasting device with oscillating nozzle
DE19802308C2 (de) * 1998-01-22 2001-05-31 Horst Laug Absaugvorrichtung für Sandstrahl- und Flüssigkeitsdruckdüsen
DE19926084B4 (de) 1999-06-08 2005-11-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Absaugvorrichtung und Vorrichtung enthaltend eine Absaugvorrichtung
KR100436540B1 (ko) 2001-11-23 2004-06-19 한국수력원자력 주식회사 Ｃｏ₂ 분사제염 발생 오염입자 포집방법 및 장치
DE20308788U1 (de) 2003-06-04 2003-08-28 Univ Hannover Oberflächenbearbeitungsvorrichtung
JP2007327149A (ja) * 2006-06-07 2007-12-20 Kogo Nakagawa 毛玉取り器

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