EP1765551A1 - Method and device for generating a jet of dry ice particles - Google Patents
Method and device for generating a jet of dry ice particlesInfo
- Publication number
- EP1765551A1 EP1765551A1 EP05706835A EP05706835A EP1765551A1 EP 1765551 A1 EP1765551 A1 EP 1765551A1 EP 05706835 A EP05706835 A EP 05706835A EP 05706835 A EP05706835 A EP 05706835A EP 1765551 A1 EP1765551 A1 EP 1765551A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ice particles
- dry ice
- cross
- jet
- space
- 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
Links
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
Definitions
- the invention relates to a process for producing a jet of dry ice particles, in which liquid carbon dioxide is depressurized in a flash chamber in order to form the dry ice particles, which are then introduced into a stream of a carrier gas, and a device for carrying out this process ,
- the device is part of a blasting system that serves to rid large surfaces, such as the inner surfaces of pipes or boilers in industrial plants from stuck encrustations.
- the liquid carbon dioxide is introduced from a supply line, which is formed for example by a capillary, in a relaxation space with a larger cross section, so that evaporates a part of the Kohlendi ⁇ oxide by the expansion, while another part of the carbon dioxide condenses due to the evaporative cooling to dry ice particles.
- the relaxation space opens, preferably laterally, into a jet line, through which the carrier gas, for example compressed air or nitrogen, flows.
- a nozzle preferably a Laval nozzle, is provided, so that the jet is accelerated to high speeds, preferably to supersonic speed.
- the relaxation space is formed by a pipe socket having an internal thread.
- This internal thread is to form disturbing edges, where the impact of the dry ice particles should form a crust of dry ice. Behind this is the theory that by crumbling of this crust larger dry ice particles arise.
- disturbing edges are mentioned, which are formed by internals such as an impeller or a screw inside the expansion chamber. It was previously assumed that the interfering edges should serve as impact body for the dry ice, but on the other hand, the removal should not prevent the dry ice particles and the gas from the expansion space, because otherwise the pressure in the expansion chamber would be too large and thus the relaxation and evaporation of liquid carbon dioxide would be hindered.
- the object of the invention is to further improve this known method and the device in order to achieve an even more efficient production of dry ice particles having a high cleaning effect.
- the relaxation space should have a certain minimum length. As a result of the cross-sectional constriction according to the invention, this minimum length can be reduced without sacrificing performance so that a more compact and more manageable design of the device is made possible.
- An apparatus for carrying out the method according to the invention is characterized in that a cross-sectional constriction is provided at the outlet of the expansion space.
- the cross-sectional constriction should preferably amount to at least 20% of the cross-sectional area of the expansion space.
- the cross-sectional constriction is achieved by approximately stromlinien ⁇ shaped structures that are well flowed around by the dry ice particles and do not form a significant impact surface for the dry ice particles.
- a displacement body in the shape of a cone, a sphere, a hemisphere or the like is provided on the center axis of the relaxation chamber, the pointed or rounded side of which is directed upstream.
- the outlet cross section of the expansion space is then formed by an annular gap between the wall of the expansion space and the displacement body.
- axial bores can be provided in the displacement body.
- the cross-sectional constriction is achieved by virtue of the fact that the expansion space at the outlet end tapers conically.
- These measures can also be combined by arranging a displacement body centrally in the tapered outlet area of the expansion space.
- the supply line for the flüssi ⁇ ge carbon dioxide and the relaxation space are arranged coaxially inside the Strahl ⁇ line, so that the narrowed outlet of the expansion chamber is located centrally in the steel pipe.
- the displacement body can in this case hineinra ⁇ gen in this chamber or in the beam line.
- FIG. 1 shows a longitudinal section through a device according to a first embodiment of the invention.
- FIG. 2 shows a detail from FIG. 1 on an enlarged scale
- Fig. 10 is a section along the line X-X in Figure 9;
- the device shown in Figure 1 has a jet nozzle 10, z.
- a jet nozzle 10 a convergent / divergent nozzle or Laval nozzle with which a beam of Il ⁇ gases to be generated, which has approximately sound velocity or supersonic speed and the solid dry ice particles are added as a blasting agent.
- the jet nozzle 10 is connected to a jet line 12, which in turn is connected to a pressure source (not shown) and flows through the carrier gas, for example compressed air with a pressure in the order of magnitude of IMPa and a throughput of, for example, 1 to 10 m 3 / min becomes.
- a pressure source not shown
- the carrier gas for example compressed air with a pressure in the order of magnitude of IMPa and a throughput of, for example, 1 to 10 m 3 / min becomes.
- liquid carbon dioxide is supplied from a non-shown high-pressure tank or cold tank.
- the supply line 14 is spielmik formed as a capillary or throttled ge by an adjustable aperture, so that the throughput of liquid carbon dioxide, for example, in the order of 0, 1 to 0.4 kg per cubic meter of carrier gas (Volu ⁇ men under atmospheric pressure) lies.
- the supply line 14 opens into a relaxation space 16 which is widened in cross-section and is formed by the interior of a nozzle 18 which opens obliquely into the jet line 12.
- These dry ice particles are transported into the jet line 12 by the simultaneously occurring gaseous carbon dioxide or sucked out of the expansion space 16 by the dynamic pressure of the carrier gas and are thus distributed in the carrier gas flow and finally through the jet nozzle 10 at high speed delivered a workpiece to be cleaned.
- the throughput of liquid carbon dioxide and the carrier gas throughput can be regulated.
- a cone-shaped displacement body 20 is arranged on the center axis of the connection piece 18, which is oriented coaxially to the connection piece 18 and its tip points towards the mouth of the nozzle Supply line 14 in the relaxation room 16 has.
- the mixture of gaseous and solid carbon dioxide flowing out of the expansion chamber 16, if appropriate also with certain proportions of liquid carbon dioxide, is thus displaced by the displacement body 20 and therefore exits only in a throttled manner into the jet line 12 the displacement body 20 forms a cross-sectional constriction with the walls of the nozzle 18.
- the residence time of the dry ice particles in the expansion chamber 16 saturated with cold, gaseous carbon dioxide is prolonged, so that the dry ice particles have time to grow by condensation.
- the cross-sectional constriction produces an uneven flow profile with flow velocity increasing from the expansion space 16 to the annular gap between the displacement body 20 and the wall of the nozzle 18.
- the cross-sectional constriction leads to a greater density with which the dry ice particles are suspended in the gaseous medium. All this promotes the growth of very solid dry ice particles, which then develop a high cleaning effect due to their size and hardness.
- the approximately streamlined shape of the conical combustion body 20 prevents the grown dry ice particles from being smashed again upon impact with the displacer 20.
- the displacement body 20 is shown enlarged.
- Axial bores 22 in the displacement body 20 make it possible to optimally adjust the flow profile of the medium flowing out of the expansion space 16.
- Radial lands 24 hold the displacer 20 centrally in the nozzle 18 and are shaped to provide virtually no baffles for the dry ice particles.
- FIGS. 6 and 7 show displacement bodies 30, 32 in the form of an ellipsoid or a spherical cap.
- the displacement bodies 26, 28, 30 and 32 are fastened analogously to the displacement body 20 in the connection piece 18 and can optionally also have axial bores.
- FIG. 8 shows a modified embodiment in which an ellipsoidally expanded chamber 34 is provided between the beam line 12 and the jet nozzle 10.
- the supply line 14 for liquid carbon dioxide ver ⁇ here runs coaxially in the jet line 12 upstream of the chamber 34 and opens into the expansion space 16, which is here at the upstream end of the chamber 34 and opens axially into this chamber.
- the outlet of the expansion space 36 is narrowed in cross section by the conical displacement body 20.
- this displacement body projects somewhat into the jet line 12 or into the chamber 34 and thus effects a good distribution of the dry ice particles in the widened chamber 34.
- FIGS. 9 and 10 show an embodiment of the device which resembles in its construction the device according to FIG.
- the cross-section constriction at the outlet of the expansion space 16 is not formed here by a centrally disposed displacement body, but by hump-like displacement bodies 36, which are arranged distributed in the downstream region of the stub 18 on its inner wall.
- Figures 1 1 and 12 show embodiments in which the nozzle 18 at its end facing the supply line 14 has a larger cross section, downstream of which a conically tapering section 38 connects, here the outlet of the expansion chamber 16 and at the same time the cross-sectional constriction of this outlet forms.
- the displacement body 20 is additionally provided downstream of the conically tapered section 38.
- the length of the cylindric expansion space 16 should not be too small, in particular in the case of small-sized devices in which the inner diameter of the jet line 12 is smaller than approximately 15 mm, so that the expansion space has a sufficient volume.
- the diameter of the expansion space 16 is preferably greater than the diameter of the beam line 12.
- the cross-sectional constriction at the outlet of the expansion space is typically between 20 and 50% of the cross-sectional area in the interior of the expansion space 16.
- the exact extent of the cross-sectional constriction depends on the respective process parameters, in particular on the pressure and throughput of the carrier gas, the throughput liquid carbon dioxide, the temperature of the liquid carbon dioxide and the like. In general, a cross-sectional constriction of the order of 40% is appropriate.
- the diameter of the beam line 12 may vary, for example, between 8 and 32 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Carbon And Carbon Compounds (AREA)
- Cleaning In General (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202004011090 | 2004-07-13 | ||
DE102004051005A DE102004051005A1 (en) | 2004-07-13 | 2004-10-20 | Jet device for effective conversion of liquid carbon dioxide to dry snow or dry ice particles |
PCT/EP2005/000031 WO2006005377A1 (en) | 2004-07-13 | 2005-01-03 | Method and device for generating dry ice particles |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1765551A1 true EP1765551A1 (en) | 2007-03-28 |
EP1765551B1 EP1765551B1 (en) | 2008-11-26 |
Family
ID=34960593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05706835A Not-in-force EP1765551B1 (en) | 2004-07-13 | 2005-01-03 | Device for generating a jet of dry ice particles |
Country Status (6)
Country | Link |
---|---|
US (1) | US7708620B2 (en) |
EP (1) | EP1765551B1 (en) |
JP (1) | JP4580985B2 (en) |
AT (1) | ATE415243T1 (en) |
DE (2) | DE102004051005A1 (en) |
WO (1) | WO2006005377A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013001205A1 (en) | 2011-06-29 | 2013-01-03 | L'air Liquide,Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Nozzle for spraying dry ice, notably dry ice made from carbon dioxide |
WO2013038084A1 (en) | 2011-09-13 | 2013-03-21 | L'air Liquide,Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Device for spraying dry ice, particularly frozen carbon dioxide, and nozzle for said device |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5276672B2 (en) | 2007-12-10 | 2013-08-28 | ヴェルナー キップ イェンス | Dry ice spraying equipment |
US7753521B2 (en) | 2008-03-31 | 2010-07-13 | Johnson & Johnson Vision Care, Inc. | Lenses for the correction of presbyopia and methods of designing the lenses |
DE102008018933A1 (en) | 2008-04-04 | 2009-10-08 | Linde Aktiengesellschaft | Adjustable device and method for cleaning surfaces |
US20090307868A1 (en) * | 2008-06-12 | 2009-12-17 | Lee Tai-Cheung | Cleaning assembly for a surface of a roller |
DE102010060716A1 (en) | 2010-11-22 | 2012-05-24 | Jens-Werner Kipp | Method for cleaning exhaust gas filters for diesel motor of e.g. motor vehicle, involves accelerating blasting medium in jet nozzles so that medium strikes filter, where filter is arranged in front of suction openings during blasting |
EP2542327B1 (en) | 2010-04-03 | 2016-10-12 | KIPP, Jens-Werner | Method for cleaning filters |
US8268743B2 (en) * | 2011-05-04 | 2012-09-18 | Steag Energy Services Gmbh | Pluggage removal method for SCR catalysts and systems |
CN102580940A (en) * | 2012-02-15 | 2012-07-18 | 上海鸣华化工科技有限公司 | Uniformly and stably jetted liquid carbon dioxide cleaning spray gun |
CN102527660A (en) * | 2012-02-15 | 2012-07-04 | 上海鸣华化工科技有限公司 | Cleaning method using uniformly and stably jet cleaning agent formed by separately using liquid carbon dioxide or mixing liquid carbon dioxide and compressed gas |
US8900372B2 (en) * | 2012-11-07 | 2014-12-02 | Trc Services, Inc. | Cryogenic cleaning methods for reclaiming and reprocessing oilfield tools |
US20170072536A1 (en) * | 2015-09-16 | 2017-03-16 | Michael Seago | Injection Capable Blasting Equipment |
CN115151379A (en) | 2019-12-31 | 2022-10-04 | 冷喷有限责任公司 | Method and apparatus for enhanced jet flow |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4253610A (en) * | 1979-09-10 | 1981-03-03 | Larkin Joe M | Abrasive blast nozzle |
US5125979A (en) * | 1990-07-02 | 1992-06-30 | Xerox Corporation | Carbon dioxide snow agglomeration and acceleration |
DE4112890A1 (en) * | 1991-04-19 | 1992-10-22 | Abony Szuecs Eva | METHOD AND DEVICE FOR CLEANING SURFACES, ESPECIALLY SENSITIVE SURFACES |
JP2557383Y2 (en) * | 1991-12-06 | 1997-12-10 | 大陽東洋酸素株式会社 | Dry ice blast injection gun |
US5779523A (en) * | 1994-03-01 | 1998-07-14 | Job Industies, Ltd. | Apparatus for and method for accelerating fluidized particulate matter |
US5975996A (en) * | 1996-07-18 | 1999-11-02 | The Penn State Research Foundation | Abrasive blast cleaning nozzle |
EP1035947B1 (en) * | 1997-12-05 | 2002-01-16 | KIPP, Jens-Werner | Blasting method for cleaning pipes |
JP3509738B2 (en) * | 2000-11-14 | 2004-03-22 | 株式会社アイテック | Dry ice injection device |
DE10126100A1 (en) * | 2001-05-29 | 2002-12-05 | Linde Ag | Production of a coating or a molded part comprises injecting powdered particles in a gas stream only in the divergent section of a Laval nozzle, and applying the particles at a specified speed |
US6659844B2 (en) * | 2001-05-29 | 2003-12-09 | General Electric Company | Pliant coating stripping |
ES2260691T3 (en) * | 2002-09-20 | 2006-11-01 | Jens-Werner Kipp | CLEANING PROCEDURE AND DEVICE BY PROJECTION. |
JP2005111575A (en) * | 2003-10-03 | 2005-04-28 | Hitachi Industries Co Ltd | Co2 snow jetting device and co2 snow jetting method |
-
2004
- 2004-10-20 DE DE102004051005A patent/DE102004051005A1/en not_active Withdrawn
-
2005
- 2005-01-03 WO PCT/EP2005/000031 patent/WO2006005377A1/en not_active Application Discontinuation
- 2005-01-03 AT AT05706835T patent/ATE415243T1/en active
- 2005-01-03 US US11/571,622 patent/US7708620B2/en not_active Expired - Fee Related
- 2005-01-03 EP EP05706835A patent/EP1765551B1/en not_active Not-in-force
- 2005-01-03 JP JP2007520678A patent/JP4580985B2/en not_active Expired - Fee Related
- 2005-01-03 DE DE502005006080T patent/DE502005006080D1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2006005377A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013001205A1 (en) | 2011-06-29 | 2013-01-03 | L'air Liquide,Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Nozzle for spraying dry ice, notably dry ice made from carbon dioxide |
WO2013038084A1 (en) | 2011-09-13 | 2013-03-21 | L'air Liquide,Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Device for spraying dry ice, particularly frozen carbon dioxide, and nozzle for said device |
Also Published As
Publication number | Publication date |
---|---|
DE102004051005A1 (en) | 2006-02-02 |
JP4580985B2 (en) | 2010-11-17 |
ATE415243T1 (en) | 2008-12-15 |
DE502005006080D1 (en) | 2009-01-08 |
US7708620B2 (en) | 2010-05-04 |
US20080287040A1 (en) | 2008-11-20 |
JP2008505772A (en) | 2008-02-28 |
EP1765551B1 (en) | 2008-11-26 |
WO2006005377A1 (en) | 2006-01-19 |
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