US20120031350A1 - Ice blast cleaning systems and methods - Google Patents
Ice blast cleaning systems and methods Download PDFInfo
- Publication number
- US20120031350A1 US20120031350A1 US12/851,572 US85157210A US2012031350A1 US 20120031350 A1 US20120031350 A1 US 20120031350A1 US 85157210 A US85157210 A US 85157210A US 2012031350 A1 US2012031350 A1 US 2012031350A1
- Authority
- US
- United States
- Prior art keywords
- slag
- layer
- ice
- boiler
- ice pellets
- 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.)
- Abandoned
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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
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
-
- 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 present application relates generally to ice blast cleaning systems and methods and more particularly relates to high pressure ice blast cleaning systems and methods to clean slag and the like from industrial boiler tubes via mechanical impact and thermal stress.
- industrial boilers operate by using a heat source to create steam from water or another type of a working fluid.
- the steam may be used to drive a turbine or another type of load.
- the heat source may be a combustor that burns a fuel-air mixture therein. Heat may be transferred to the working fluid from the combustor via a heat exchanger. Burning the fuel-air mixture, however, may generate residue on the surface of the combustor, the heat exchanger, and the like. Such deposits of soot, ash, slag, dust, and/or other types of residues on the heat exchanger surfaces may inhibit the efficient transfer of heat to the working fluid. This reduction in efficiency may be reflected by an increase in exhaust gas temperatures from the backend of the process as well as an increase in the fuel burn rate required to maintain steady steam production and energy output.
- Periodic removal of these deposits thus may help maintain the efficiency of such a boiler system.
- the complete removal of the deposits generally requires the boiler to be shutdown while the cleaning process is performed.
- Such cleaning processes thus may be relatively time consuming and costly at least in terms of boiler downtime.
- Pressurized steam, water jets, acoustic waves, abrasive ash, mechanical hammering, detonative combustion devices, and other types of cleaning processes have been used to remove these internal deposits.
- the use of pressurized steam and/or water may blow the accumulated ash off of the tube banks but generally will not eliminate a hard layer of slag.
- the abrasive particle methods may add more hard particles of materials into the boiler, which also may cause a blockage.
- Other types of cleaning processes may be known.
- the present application thus provides an ice blast cleaning method for a layer of slag on a surface.
- the ice blast cleaning method may include the steps of maintaining the surface with the layer of slag thereon at an elevated temperature, shooting a number of ice pellets at the layer of slag on the surface, and loosening the layer of slag on the surface via a mechanical impact of the ice pellets on the layer of slag and a thermal shock caused by a temperature differential between the ice pellets and the layer of slag.
- the present application further provides a heat exchanger system.
- the heat exchanger system may include a heat exchanger positioned within a combustion stream such that the combustion stream creates a layer of slag on the heat exchanger.
- the heat exchanger system further includes an ice blast system positioned about the heat exchanger. The ice blast system shoots a stream of ice pellets at the layer of slag so as to loosen the layer of slag via a mechanical impact of the stream of ice pellets on the layer of slag and a thermal shock caused by a temperature differential between the stream of ice pellets and the layer of slag.
- the present application further provides a boiler system.
- the boiler system may include a boiler with a number of boiler tubes therein.
- the boiler tubes may include a layer of slag thereon.
- the boiler system also may include an ice blast system positioned about the boiler. The ice blast system shoots a stream of ice pellets at the layer of slag so as to loosen the layer of slag via a mechanical impact of the stream of ice pellets on the layer of slag and a thermal shock caused by a temperature differential between the stream of ice pellets and the layer of slag.
- FIG. 1 is a schematic view of an ice blast cleaning system as may be described herein for use with a boiler system or other type of heat exchanger system and the like.
- FIG. 1 shows a heat exchanger system 10 such as a boiler 15 as may be known in the art.
- the boiler 15 may include a number of boiler tubes 20 or other types of heat exchanger surfaces positioned therein. Heat is transferred to a medium flowing within the boiler tubes 20 via a combustion stream 25 or other types of heat sources. As described above, the combustion stream 25 tends to build a layer of slag 30 onto the boiler tubes 20 or other types of internal surfaces 40 such as boiler chamber water walls 45 .
- slag we refer to slag, soot, ash, slug, dust, and/or any type of unwanted residue thereon.
- This layer of slag 30 may interfere with the efficiency of the overall boiler 15 .
- Other types of heat exchangers 10 or boiler 15 configurations also may be used herein.
- any surface 40 with a buildup of the layer of slag 30 or the like may be used herein.
- FIG. 1 further shows an ice blast cleaning system 100 as may be described herein that may be used with the heat exchanger 10 or the boiler 15 .
- the ice blast cleaning system 100 may shoot a stream of ice pellets 110 at the layer of slag 30 of the boiler tubes 20 or other type of surface 40 .
- the ice pellets 110 may be made out of any type of fluid such as water and the like.
- the ice pellets 110 also may be dry ice pellets.
- the ice pellets 110 may have any desired size, shape, temperature, velocity, and/or other characteristics and combinations thereof. Any number of the ice pellets 110 may be used herein.
- the ice blast cleaning system 100 may include an ice hopper 120 for making and/or storing the ice pellets 110 .
- the ice hopper 120 may be in communication with a mixer 130 or other type of staging device.
- the mixer 130 also may be in communication with a compressed air source 140 . Any type of compressed air source 140 or other type of pressurized medium may be used herein.
- any type of drive force may be used as a drive mechanism herein.
- the mixer 130 may forward a stream of the ice pellets 110 with the aid of the compressed air source 140 or other type of drive mechanism.
- the ice blast cleaning system also may use a tube 150 with a lance or a nozzle 160 .
- the tube 150 and the nozzle 160 may deliver the ice pellets 110 to the surface 40 of the desired target.
- the tube 150 may be of conventional design and may be flexible or stiff.
- the tube 150 and the nozzle 160 may be retractable and may be positioned in any desired location.
- the nozzle 160 may have one or multiple apertures thereon. Other types of delivery systems may be used herein.
- the ice blast cleaning system 100 as a whole may have any desired size, shape, or configuration. Specifically, any device for shooting ice pellets 110 at a sufficient rate, velocity, and/or other characteristics with respect to the boiler tubes 20 or other surface 40 may be used herein.
- the ice blast cleaning system 100 may be used while the boiler 15 is still in operation or at least still heated.
- the nozzle 160 or other type of delivery device of the ice blast cleaning system 100 may be positioned about the boiler tubes 20 or other surface 40 and blast the ice pellets 110 under pressure towards the layer of slag 30 .
- the combination of the impact of the ice pellets 110 and the thermal shock of the high temperature layer of the slag 30 combines to loosen and remove the layer of slag 30 thereon.
- the mechanical impact of the ice pellets 110 on the layer of slag 30 combines with the thermal shock caused by the temperature differential between the cold ice pellets 110 and the hot layer of slag 30 .
- Modifications may be made as to the size of the ice pellets 110 , the initial temperature of the ice pellets 110 , and other variables. Moreover, the initial velocity of the ice pellets 110 also may vary. Calculations based upon the size, temperature, and velocity of the ice pellets 110 may ensure the desired mechanical and thermal impact of the ice pellets 110 on the layer of slag 30 or otherwise. As described above, dry ice also may be used herein and has the advantage of a colder initial temperature. Other types of frozen mediums also may be used herein. Likewise, combinations of different types of ice pellets 110 also may be used herein.
- the ice blast cleaning system 100 thus provides the advantage of the steam, water, or abrasive cleaning systems and methods described above but without the associated detriments of each, i.e., thicker layers of slag 30 may be removed as compared to steam or water system but without the potential for blockage that may be caused by the use of abrasive particles.
- the combination of the high pressure impact of the ice pellets 110 along with the associated thermal shock to the high temperature layer of the slag 30 thus provide the improved cleaning methods and benefits herein without the downtime normally associated with such cleaning methods.
Abstract
Description
- The present application relates generally to ice blast cleaning systems and methods and more particularly relates to high pressure ice blast cleaning systems and methods to clean slag and the like from industrial boiler tubes via mechanical impact and thermal stress.
- Generally described, industrial boilers operate by using a heat source to create steam from water or another type of a working fluid. The steam may be used to drive a turbine or another type of load. The heat source may be a combustor that burns a fuel-air mixture therein. Heat may be transferred to the working fluid from the combustor via a heat exchanger. Burning the fuel-air mixture, however, may generate residue on the surface of the combustor, the heat exchanger, and the like. Such deposits of soot, ash, slag, dust, and/or other types of residues on the heat exchanger surfaces may inhibit the efficient transfer of heat to the working fluid. This reduction in efficiency may be reflected by an increase in exhaust gas temperatures from the backend of the process as well as an increase in the fuel burn rate required to maintain steady steam production and energy output.
- Periodic removal of these deposits thus may help maintain the efficiency of such a boiler system. Typically, the complete removal of the deposits generally requires the boiler to be shutdown while the cleaning process is performed. Such cleaning processes thus may be relatively time consuming and costly at least in terms of boiler downtime.
- Pressurized steam, water jets, acoustic waves, abrasive ash, mechanical hammering, detonative combustion devices, and other types of cleaning processes have been used to remove these internal deposits. The use of pressurized steam and/or water may blow the accumulated ash off of the tube banks but generally will not eliminate a hard layer of slag. Moreover, the abrasive particle methods may add more hard particles of materials into the boiler, which also may cause a blockage. Other types of cleaning processes may be known.
- There is thus a desire for improved boiler cleaning system and methods that are able to operate quickly to remove internal slag deposits and the like so as to minimize overall downtime of the boiler and similar types of devices. Moreover, such cleaning systems and methods should not interfere with the overall operation and use of the boiler.
- The present application thus provides an ice blast cleaning method for a layer of slag on a surface. The ice blast cleaning method may include the steps of maintaining the surface with the layer of slag thereon at an elevated temperature, shooting a number of ice pellets at the layer of slag on the surface, and loosening the layer of slag on the surface via a mechanical impact of the ice pellets on the layer of slag and a thermal shock caused by a temperature differential between the ice pellets and the layer of slag.
- The present application further provides a heat exchanger system. The heat exchanger system may include a heat exchanger positioned within a combustion stream such that the combustion stream creates a layer of slag on the heat exchanger. The heat exchanger system further includes an ice blast system positioned about the heat exchanger. The ice blast system shoots a stream of ice pellets at the layer of slag so as to loosen the layer of slag via a mechanical impact of the stream of ice pellets on the layer of slag and a thermal shock caused by a temperature differential between the stream of ice pellets and the layer of slag.
- The present application further provides a boiler system. The boiler system may include a boiler with a number of boiler tubes therein. The boiler tubes may include a layer of slag thereon. The boiler system also may include an ice blast system positioned about the boiler. The ice blast system shoots a stream of ice pellets at the layer of slag so as to loosen the layer of slag via a mechanical impact of the stream of ice pellets on the layer of slag and a thermal shock caused by a temperature differential between the stream of ice pellets and the layer of slag.
- These and other features and improvements of the present application will become apparent to one of ordinary skill in the art upon review of the following detailed description when taken in conjunction with the several drawings and the appended claims.
-
FIG. 1 is a schematic view of an ice blast cleaning system as may be described herein for use with a boiler system or other type of heat exchanger system and the like. - Referring now to the drawings, in which like numbers refer to like elements throughout the view,
FIG. 1 shows aheat exchanger system 10 such as aboiler 15 as may be known in the art. Theboiler 15 may include a number ofboiler tubes 20 or other types of heat exchanger surfaces positioned therein. Heat is transferred to a medium flowing within theboiler tubes 20 via acombustion stream 25 or other types of heat sources. As described above, thecombustion stream 25 tends to build a layer ofslag 30 onto theboiler tubes 20 or other types ofinternal surfaces 40 such as boilerchamber water walls 45. By the term “slag”, we refer to slag, soot, ash, slug, dust, and/or any type of unwanted residue thereon. This layer ofslag 30 may interfere with the efficiency of theoverall boiler 15. Other types ofheat exchangers 10 orboiler 15 configurations also may be used herein. Generally described, anysurface 40 with a buildup of the layer ofslag 30 or the like may be used herein. -
FIG. 1 further shows an iceblast cleaning system 100 as may be described herein that may be used with theheat exchanger 10 or theboiler 15. Generally described, the iceblast cleaning system 100 may shoot a stream ofice pellets 110 at the layer ofslag 30 of theboiler tubes 20 or other type ofsurface 40. Theice pellets 110 may be made out of any type of fluid such as water and the like. Theice pellets 110 also may be dry ice pellets. Theice pellets 110 may have any desired size, shape, temperature, velocity, and/or other characteristics and combinations thereof. Any number of theice pellets 110 may be used herein. - The ice
blast cleaning system 100 may include anice hopper 120 for making and/or storing theice pellets 110. In turn, theice hopper 120 may be in communication with amixer 130 or other type of staging device. Themixer 130 also may be in communication with acompressed air source 140. Any type ofcompressed air source 140 or other type of pressurized medium may be used herein. Likewise, any type of drive force may be used as a drive mechanism herein. Themixer 130 may forward a stream of theice pellets 110 with the aid of thecompressed air source 140 or other type of drive mechanism. - The ice blast cleaning system also may use a
tube 150 with a lance or anozzle 160. Thetube 150 and thenozzle 160 may deliver theice pellets 110 to thesurface 40 of the desired target. Thetube 150 may be of conventional design and may be flexible or stiff. Thetube 150 and thenozzle 160 may be retractable and may be positioned in any desired location. Thenozzle 160 may have one or multiple apertures thereon. Other types of delivery systems may be used herein. - The ice
blast cleaning system 100 as a whole may have any desired size, shape, or configuration. Specifically, any device for shootingice pellets 110 at a sufficient rate, velocity, and/or other characteristics with respect to theboiler tubes 20 orother surface 40 may be used herein. - In use, the ice
blast cleaning system 100 may be used while theboiler 15 is still in operation or at least still heated. Thenozzle 160 or other type of delivery device of the iceblast cleaning system 100 may be positioned about theboiler tubes 20 orother surface 40 and blast theice pellets 110 under pressure towards the layer ofslag 30. The combination of the impact of theice pellets 110 and the thermal shock of the high temperature layer of theslag 30 combines to loosen and remove the layer ofslag 30 thereon. Specifically, the mechanical impact of theice pellets 110 on the layer ofslag 30 combines with the thermal shock caused by the temperature differential between thecold ice pellets 110 and the hot layer ofslag 30. - Modifications may be made as to the size of the
ice pellets 110, the initial temperature of theice pellets 110, and other variables. Moreover, the initial velocity of theice pellets 110 also may vary. Calculations based upon the size, temperature, and velocity of theice pellets 110 may ensure the desired mechanical and thermal impact of theice pellets 110 on the layer ofslag 30 or otherwise. As described above, dry ice also may be used herein and has the advantage of a colder initial temperature. Other types of frozen mediums also may be used herein. Likewise, combinations of different types ofice pellets 110 also may be used herein. - The ice
blast cleaning system 100 thus provides the advantage of the steam, water, or abrasive cleaning systems and methods described above but without the associated detriments of each, i.e., thicker layers ofslag 30 may be removed as compared to steam or water system but without the potential for blockage that may be caused by the use of abrasive particles. The combination of the high pressure impact of theice pellets 110 along with the associated thermal shock to the high temperature layer of theslag 30 thus provide the improved cleaning methods and benefits herein without the downtime normally associated with such cleaning methods. - It should be apparent that the foregoing relates only to certain embodiments of the present application and that numerous changes and modifications may be made herein by one of ordinary skill in the art without departing from the general spirit and scope of the invention as defined by the following claims and the equivalents thereof.
Claims (20)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/851,572 US20120031350A1 (en) | 2010-08-06 | 2010-08-06 | Ice blast cleaning systems and methods |
EP11175687.0A EP2415559A3 (en) | 2010-08-06 | 2011-07-28 | Ice blast cleaning systems and methods |
CN2011102302534A CN102374550A (en) | 2010-08-06 | 2011-08-05 | Ice blast cleaning systems and methods |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/851,572 US20120031350A1 (en) | 2010-08-06 | 2010-08-06 | Ice blast cleaning systems and methods |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120031350A1 true US20120031350A1 (en) | 2012-02-09 |
Family
ID=44651058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/851,572 Abandoned US20120031350A1 (en) | 2010-08-06 | 2010-08-06 | Ice blast cleaning systems and methods |
Country Status (3)
Country | Link |
---|---|
US (1) | US20120031350A1 (en) |
EP (1) | EP2415559A3 (en) |
CN (1) | CN102374550A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160341499A1 (en) * | 2015-05-19 | 2016-11-24 | Uop Llc | Process for online cleaning of mto reactor effluent cooler |
US20170022460A1 (en) * | 2015-07-26 | 2017-01-26 | Talmor Suchard | On line chemical cleaning of air coolers |
WO2019118206A1 (en) * | 2017-12-11 | 2019-06-20 | Precision Iceblast Corporation | Deep cleaning alignment equipment |
USD876189S1 (en) | 2017-12-11 | 2020-02-25 | Precision Iceblast Corporation | Deep cleaning alignment tool |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103277987B (en) * | 2013-05-24 | 2015-01-28 | 无锡华光锅炉股份有限公司 | Overall drying technology and tool structure of waste heat boiler heating surface module of gas turbine |
KR101387024B1 (en) * | 2013-11-25 | 2014-04-21 | 한모기술주식회사 | The combined cleaning system for hear exchanger |
CN104713412A (en) * | 2013-12-13 | 2015-06-17 | 琳德股份公司 | On-line cleaning method |
CN104785466B (en) * | 2015-05-05 | 2017-10-27 | 武汉鑫丞科技有限公司 | A kind of intelligent circulating cooling water- to-water heat exchanger automatic on-line purging system and method |
CN109262469A (en) * | 2018-10-30 | 2019-01-25 | 华侨大学 | A kind of method of dry ice Jet Polishing hard brittle material |
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US3778938A (en) * | 1971-02-17 | 1973-12-18 | Siemens Ag | Method for decontamination of surfaces of nuclear reactor components |
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US5517950A (en) * | 1993-05-26 | 1996-05-21 | Kendrick; William E. | System for slag removal and the like |
US6174225B1 (en) * | 1997-11-13 | 2001-01-16 | Waste Minimization And Containment Inc. | Dry ice pellet surface removal apparatus and method |
US6536220B2 (en) * | 2001-05-11 | 2003-03-25 | Universal Ice Blast, Inc. | Method and apparatus for pressure-driven ice blasting |
US6585569B2 (en) * | 2000-12-28 | 2003-07-01 | General Electric Company | Method of cleaning gas turbine compressors using crushed, solid material capable of sublimating |
US7033249B2 (en) * | 2004-05-14 | 2006-04-25 | British Columbia Hydro And Power Authority | Dry ice blasting cleaning apparatus |
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US20090277473A1 (en) * | 2008-05-06 | 2009-11-12 | Arlie Mitchell Boggs | Methods for cleaning tubulars using solid carbon dioxide |
US7767027B2 (en) * | 2004-12-17 | 2010-08-03 | Clyde Bergemann Gmbh | Method and apparatus for removing combustion residues using different cleaning media |
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TW218852B (en) * | 1992-12-23 | 1994-01-11 | D Fraresso William | Apparatus for real time ice supply to ice blasting system |
CA2232445A1 (en) * | 1997-03-25 | 1998-09-25 | Michael J. Strelbisky | Removal of slag and/or steel build-up from lances |
ITRM20010448A1 (en) * | 2001-07-25 | 2003-01-25 | Mario Martinez | PROCEDURE FOR THE CLEANING OF INTENSE STEAM AND WATER PIPES OF OVENS THAT BURN CHARCOAL, GARBAGE AND SIMILAR FOR THE PRODUCTION OF |
US8313581B2 (en) * | 2008-08-08 | 2012-11-20 | Philip Bear | Industrial cleaning system and methods related thereto |
-
2010
- 2010-08-06 US US12/851,572 patent/US20120031350A1/en not_active Abandoned
-
2011
- 2011-07-28 EP EP11175687.0A patent/EP2415559A3/en not_active Withdrawn
- 2011-08-05 CN CN2011102302534A patent/CN102374550A/en active Pending
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US3778938A (en) * | 1971-02-17 | 1973-12-18 | Siemens Ag | Method for decontamination of surfaces of nuclear reactor components |
US5107764A (en) * | 1990-02-13 | 1992-04-28 | Baldwin Technology Corporation | Method and apparatus for carbon dioxide cleaning of graphic arts equipment |
US5517950A (en) * | 1993-05-26 | 1996-05-21 | Kendrick; William E. | System for slag removal and the like |
US6174225B1 (en) * | 1997-11-13 | 2001-01-16 | Waste Minimization And Containment Inc. | Dry ice pellet surface removal apparatus and method |
US6585569B2 (en) * | 2000-12-28 | 2003-07-01 | General Electric Company | Method of cleaning gas turbine compressors using crushed, solid material capable of sublimating |
US6536220B2 (en) * | 2001-05-11 | 2003-03-25 | Universal Ice Blast, Inc. | Method and apparatus for pressure-driven ice blasting |
US7033249B2 (en) * | 2004-05-14 | 2006-04-25 | British Columbia Hydro And Power Authority | Dry ice blasting cleaning apparatus |
US7767027B2 (en) * | 2004-12-17 | 2010-08-03 | Clyde Bergemann Gmbh | Method and apparatus for removing combustion residues using different cleaning media |
WO2009030680A2 (en) * | 2007-09-04 | 2009-03-12 | Clyde Bergemann Gmbh | Device for cleaning a boiler of a combustor, and method for the operation thereof |
US20090277473A1 (en) * | 2008-05-06 | 2009-11-12 | Arlie Mitchell Boggs | Methods for cleaning tubulars using solid carbon dioxide |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160341499A1 (en) * | 2015-05-19 | 2016-11-24 | Uop Llc | Process for online cleaning of mto reactor effluent cooler |
US20170022460A1 (en) * | 2015-07-26 | 2017-01-26 | Talmor Suchard | On line chemical cleaning of air coolers |
US20180223226A1 (en) * | 2015-07-26 | 2018-08-09 | SENTRO Technologies USA, LLC | On line chemical cleaning of air coolers |
US10787631B2 (en) * | 2015-07-26 | 2020-09-29 | SENTRO Technologies USA, LLC | On line chemical cleaning of air coolers |
WO2019118206A1 (en) * | 2017-12-11 | 2019-06-20 | Precision Iceblast Corporation | Deep cleaning alignment equipment |
USD876189S1 (en) | 2017-12-11 | 2020-02-25 | Precision Iceblast Corporation | Deep cleaning alignment tool |
US11313632B2 (en) | 2017-12-11 | 2022-04-26 | Precision Iceblast Corporation | Deep cleaning alignment equipment |
Also Published As
Publication number | Publication date |
---|---|
EP2415559A2 (en) | 2012-02-08 |
EP2415559A3 (en) | 2014-09-03 |
CN102374550A (en) | 2012-03-14 |
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Owner name: GENERAL ELECTRIC COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZHANG, TIAN XUAN;CHAPIN, DAVID MICHAEL;TAYLOR, ROBERT WARREN;SIGNING DATES FROM 20100719 TO 20100805;REEL/FRAME:024798/0856 |
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Owner name: BHA ALTAIR, LLC, TENNESSEE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GENERAL ELECTRIC COMPANY;BHA GROUP, INC.;ALTAIR FILTER TECHNOLOGY LIMITED;REEL/FRAME:031911/0797 Effective date: 20131216 |
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