EP2415559A2 - Eisreinigungsstrahlsystem und Verfahren - Google Patents

Eisreinigungsstrahlsystem und Verfahren Download PDF

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Publication number
EP2415559A2
EP2415559A2 EP11175687A EP11175687A EP2415559A2 EP 2415559 A2 EP2415559 A2 EP 2415559A2 EP 11175687 A EP11175687 A EP 11175687A EP 11175687 A EP11175687 A EP 11175687A EP 2415559 A2 EP2415559 A2 EP 2415559A2
Authority
EP
European Patent Office
Prior art keywords
slag
layer
ice
heat exchanger
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.)
Withdrawn
Application number
EP11175687A
Other languages
English (en)
French (fr)
Other versions
EP2415559A3 (de
Inventor
Tian Xuan Zhang
David Michael Chapin
Robert Warren Taylor
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.)
BHA Altair LLC
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP2415559A2 publication Critical patent/EP2415559A2/de
Publication of EP2415559A3 publication Critical patent/EP2415559A3/de
Withdrawn legal-status Critical Current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
    • B24C1/08—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 bums 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 bum 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 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. Generally described, 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. Likewise, 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 stag 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Incineration Of Waste (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP11175687.0A 2010-08-06 2011-07-28 Eisreinigungsstrahlsystem und Verfahren Withdrawn EP2415559A3 (de)

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 (2)

Publication Number Publication Date
EP2415559A2 true EP2415559A2 (de) 2012-02-08
EP2415559A3 EP2415559A3 (de) 2014-09-03

Family

ID=44651058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11175687.0A Withdrawn EP2415559A3 (de) 2010-08-06 2011-07-28 Eisreinigungsstrahlsystem und Verfahren

Country Status (3)

Country Link
US (1) US20120031350A1 (de)
EP (1) EP2415559A3 (de)
CN (1) CN102374550A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104785466A (zh) * 2015-05-05 2015-07-22 武汉鑫丞科技有限公司 一种智能化循环冷却水换热器自动在线清洗系统及方法
EP3076119A4 (de) * 2013-11-25 2017-09-06 Hong, Wonbang Komplexes reinigungssystem für wärmetauscher

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103277987B (zh) * 2013-05-24 2015-01-28 无锡华光锅炉股份有限公司 燃气轮机余热锅炉受热面模块的整体烘干工艺及工装结构
CN104713412A (zh) * 2013-12-13 2015-06-17 琳德股份公司 在线清洁方法
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
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
CN109262469A (zh) * 2018-10-30 2019-01-25 华侨大学 一种干冰射流抛光硬脆性材料的方法

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US5107764A (en) * 1990-02-13 1992-04-28 Baldwin Technology Corporation Method and apparatus for carbon dioxide cleaning of graphic arts equipment
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CA2232445A1 (en) * 1997-03-25 1998-09-25 Michael J. Strelbisky Removal of slag and/or steel build-up from lances
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
ITRM20010448A1 (it) * 2001-07-25 2003-01-25 Mario Martinez Procedimento per la pulizia dei tubi inteni del vapore e dell'acqua dei forni che bruciano carbone, immondizie e simili per la produzione di
CA2467316A1 (en) * 2004-05-14 2005-11-14 British Columbia Hydro And Power Authority Dry ice blasting cleaning apparatus
DE102004060884A1 (de) * 2004-12-17 2006-06-29 Clyde Bergemann Gmbh Verfahren und Vorrichtung zum Entfernen von Verbrennungsrückständen mit unterschiedlichen Reinigungsmedien
DE102007062449A1 (de) * 2007-09-04 2009-03-19 Bude, Friedrich, Dr.-Ing. Verfahren und Vorrichtung zur Reinigung von Heizflächen und/oder Überwachung von Betriebszuständen einer Wärmeanlage
US8696819B2 (en) * 2008-05-06 2014-04-15 Arlie Mitchell Boggs Methods for cleaning tubulars using solid carbon dioxide
US8313581B2 (en) * 2008-08-08 2012-11-20 Philip Bear Industrial cleaning system and methods related thereto

Non-Patent Citations (1)

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Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3076119A4 (de) * 2013-11-25 2017-09-06 Hong, Wonbang Komplexes reinigungssystem für wärmetauscher
CN104785466A (zh) * 2015-05-05 2015-07-22 武汉鑫丞科技有限公司 一种智能化循环冷却水换热器自动在线清洗系统及方法

Also Published As

Publication number Publication date
EP2415559A3 (de) 2014-09-03
US20120031350A1 (en) 2012-02-09
CN102374550A (zh) 2012-03-14

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