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WO2013032323A1 - Dispositif et procédé pour nettoyer des éléments d'installation industrielle - Google Patents

Dispositif et procédé pour nettoyer des éléments d'installation industrielle Download PDF

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Publication number
WO2013032323A1
WO2013032323A1 PCT/NL2012/050587 NL2012050587W WO2013032323A1 WO 2013032323 A1 WO2013032323 A1 WO 2013032323A1 NL 2012050587 W NL2012050587 W NL 2012050587W WO 2013032323 A1 WO2013032323 A1 WO 2013032323A1
Authority
WO
WIPO (PCT)
Prior art keywords
supply container
carbon dioxide
lance
solid carbon
heat source
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.)
Ceased
Application number
PCT/NL2012/050587
Other languages
English (en)
Inventor
Freddy Tom Wanschers
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.)
BWAdvise
Original Assignee
BWAdvise
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 BWAdvise filed Critical BWAdvise
Publication of WO2013032323A1 publication Critical patent/WO2013032323A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0007—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by explosions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G7/00—Cleaning by vibration or pressure waves
    • F28G7/005—Cleaning by vibration or pressure waves by explosions or detonations; by pressure waves generated by combustion processes

Definitions

  • the invention relates to a device for cleaning industrial installation components, in particular heat exchangers, distillation and washing columns and other types of vessel/conduit.
  • the invention also relates to a method for cleaning industrial installation components, in particular by making use of a device according to the invention.
  • the deposited layer impedes the heat transfer between the flue gas and the process medium for heating, this having an adverse effect on the efficiency of the thermal recuperation.
  • Diverse solutions are known in the prior art for removing the contamination layer from the wall of the industrial component with the purpose of maintaining the highest possible efficiency of the heat transfer. Use is usually made for this purpose of an explosive gas mixture or civil explosives which will be able to result in explosion at optionally increased temperature. The explosive waves generated by this explosion will result in dislodging of deposits, which are then removed.
  • An example of cleaning a heat exchanger by applying a reactive explosive gas mixture is described in NL 1016149.
  • a drawback of this technique is that the use of such explosives is relatively expensive and is generally bound by strict rules in respect of safety aspects.
  • An object of the invention is to provide an improved and safe inert device for cleaning industrial installation components such as a heat exchanger.
  • the invention provides for this purpose a device for cleaning industrial installation components, comprising: at least one explodable supply container for substantially solid carbon dioxide, at least one heat source for subliming carbon dioxide present in the supply container, and at least one activating element coupled to the heat source for activating the heat source.
  • the device according to the invention does not therefore make use of conventional explosives adapted to undergo an exothermic chemical reaction, but makes use of solid carbon dioxide which undergoes a sublimation process and transposes from the solid state to the gaseous state, this being accompanied by an instantaneous expansion in the volume of the carbon dioxide. Owing to this
  • the heat source must be so powerful that sufficient, preferably all carbon dioxide is sublimed so as to result in explosion of the supply container.
  • An additional advantage of applying carbon dioxide is that the sublimed gaseous carbon dioxide forms an inert gas and can therefore generally be applied without risk.
  • diverse industrial components can be cleaned, including heat exchangers, industrial boilers, silos, industrial filters, distillation and washing columns and conduits, hoppers, washers, spray absorbers, fans, pumps and so on.
  • the activating element can be operated manually, wherein it is generally advantageous from a safety viewpoint for the activating element to be positioned a distance from the heat source.
  • automatic operation of the activating element preferably in time and/or state- dependent manner.
  • the activating element can be formed by a switch forming part of an electronic circuit for enabling activation of the heat source.
  • the activating element will be coupled here to the (electrical) heating source by means of one or more power cables. It is also possible to envisage the activating element comprising a spark- generating element, using which the heat source can be ignited, wherein the heat source is then formed by a chemical heat source which generates heat as a result of a chemical reaction, in particular combustion.
  • the heat source being formed by an element for igniting which, following activation, will cause an exothermic reaction which generates sufficient heat to enable sublimation of the carbon dioxide present in the supply container.
  • Possible constituents of the element for igniting are potassium perchlorate, ammonium oxalate and salicylic acid.
  • the supply container preferably takes a substantially thermally insulating form in order to prevent as far as possible undesired premature sublimation of the solid carbon dioxide.
  • the supply container can for this purpose be at least partially enclosed by a thermally insulating casing.
  • the casing can take a double-walled form here, wherein an underpressure (vacuum) or an overpressure (for instance by means of a mixture of water and compressed air (water mist) and/or carbon dioxide) can be applied in the casing, which is optionally open at an outer end so that a continuous flow of the cooling medium is guaranteed.
  • an underpressure vacuum
  • an overpressure for instance by means of a mixture of water and compressed air (water mist) and/or carbon dioxide
  • the casing in hollow form being at least partially filled with an active or passive cooling medium.
  • cooling the supply container in other manner by applying a cooling medium.
  • the supply container takes a substantially closed form.
  • a desired instantaneous pressure increase in the supply container can in this way be forced as far as possible following sublimation of the carbon dioxide, which will enhance the explosive force and consequently the cleaning action of the device according to the invention. It is moreover possible in this way to prevent the carbon dioxide being prematurely heated by atmospheric heat, this further enhancing the reliability of the device.
  • the supply container In order to make the explosive force of the device as great as possible it is generally advantageous for the supply container to be substantially fully filled with solid carbon dioxide, or at least for the solid carbon dioxide to be closely confined in the supply container so that sublimation will immediately result in an instantaneous pressure increase in the supply container.
  • the shape and dimensioning of the supply container can be very diverse and generally depend on the specific application of the device according to the invention.
  • the supply container In order to be able to maintain sufficient distance from the explodable supply container it is usually advantageous for the supply container to be coupled to a - generally elongate - lance, truss and/or other type of carrier structure functioning as spacer.
  • the supply container By holding the lance or positioning it in other manner sufficient distance can be created between the explodable supply container and the person or control unit operating the device. If the device is operated manually, it is no longer necessary to have the device operated by specialist explosives engineers, this can also be done by less specialized individuals. It is advantageous here when the orientation between the supply container and the lance can be changed, whereby the reach of the device can be increased and locations of the industrial component which are relatively difficult to access can also be reached and cleaned.
  • the activating element is preferably at least partially received in the lance, this increasing the convenience of use of the device.
  • the device comprises a feed conduct connected to the supply container for providing the supply container with solid carbon dioxide.
  • the solid carbon dioxide will generally be available as grains, rods or other type of granulate (beads) which can optionally be arranged in the supply container via the feed conduit. Filling the supply container with solid carbon dioxide via the feed conduit will generally entail little risk.
  • the device will generally only cause initiation hazard following preferably substantially medium tight closure of the supply container, whereby the sublimed gaseous carbon dioxide cannot escape and pressure buildup takes place in the supply container. It is therefore generally advantageous for a closing valve or non-return valve to be arranged between the feed conduit and the supply container to enable the solid carbon dioxide to be confined in the supply container.
  • a lance it is usually advantageous for the feed conduit to be at least partially received in the (hollow) lance. If one or more power cables are guided through the hollow lance for mutual connection of the activating element and the (electrical) heat source, it is possible when a closing valve and/or hinge is applied in the lance for the electronic circuit to run (in contactless manner) via the closing valve and/or the hinge, whereby the electronic circuit will not in fact be interrupted.
  • An alternative method of filling the supply container can for instance be realized by providing the casing of the supply container with a feed opening (filling opening). This solution will however generally be less recommended since the feed opening in the casing of the supply container will result in a local weakening of the supply container, and this will usually detract from being able to realize the most homogenous possible explosion of the supply container.
  • the supply container is manufactured at least partially from plastic.
  • Plastic is relatively inexpensive and moreover an organic material which will combust or pyrolyze relatively easily in a hot space such as a boiler- house.
  • the temperature of the supply container is generally kept relatively low initially in order to be able to prevent premature initiation of the supply container, the plastic supply container will generally only combust or pyrolyze following explosion of the supply container.
  • the invention relates to a method for cleaning industrial installation components, particularly by making use of a device according to the invention, comprising of: A) positioning an explodable supply container provided with solid carbon dioxide close to an industrial installation component for cleaning, and B) causing sublimation of the carbon dioxide by means of heating the solid carbon dioxide, whereby the pressure in the supply container will increase such that the supply container will explode, wherein a shock wave will be generated by means of which the industrial installation component will be at least partially cleaned. It can be advantageous here to insulate and/or cool the supply container during step A) so as to be able to prevent as far as possible premature explosion of the supply container.
  • figure 1 shows a cross-section of a device according to the invention
  • figures 2a-2d show successive method steps for cleaning a heat exchanger using the device according to figure 1 ,
  • figure 3 shows a detailed cross-section of the supply container of the device according to figures 1 and 2
  • figure 4 shows a perspective, partially cut-away view of a boiler in which a part of a device according to the invention is arranged
  • FIG. 5 shows a cross-section of the boiler of figure 4.
  • Figure 1 shows a cross-section of a device 1 according to the invention.
  • Device 1 comprises an explodable plastic supply container 2 (shown schematically), which supply container 2 is partially filled with solid carbon dioxide 3 arranged as beads in supply container 2.
  • Supply container 2 takes a substantially closed form here.
  • the supply container 2 is optionally provided with a double casing 4 which will have an insulating effect, this subject to the application and prevailing process conditions such as temperature and pressure.
  • the carbon dioxide 3 can optionally be cooled here by means of a cooling medium.
  • a heating element (heat source) 5 which is connected via a conduit 6 to an activating element 7 which can be connected releasably to another part of device 1. After activation of heating element 5
  • Supply container 2 is connected via an (optional) hinge 8 to a lance 9 functioning as a handle, whereby an operative can maintain sufficient distance from the explodable supply container 2. Also received in lance 9 is a feed conduit 10 to enable filling of supply container 2 with solid carbon dioxide. Also received in hinge 8 is a closing valve (not shown) to enable feed conduit 10 to be closed off from supply container 2.
  • Figures 2a-2d show successive method steps for cleaning a heat exchanger 11 using device 1 according to figure 1.
  • Figure 2a shows that supply container 2 and lance 9 enclose a mutual angle of 180°. In practice the supply container 2 will be pivotable relative to lance 9 within a range between 0° and 180°. As shown, supply container 2 is inserted fully, and the lance 9 partially, by a person (or installation/robot) 12 into heat exchanger 1 1 , after which supply container 2 is positioned close to a contaminated part of heat exchanger 11. Lance 9 is held fast here by a carrier structure 13 in which activating element 7 is received.
  • FIG 3 shows a detailed cross-section of supply container 2 of device 1 according to figures 1 and 2.
  • Supply container 2 comprises a casing 4 in which the rod-like heating element 5 (heat generator) is centrally positioned.
  • Space 15 between casing 4 and supply container 2 is at least partially filled with solid carbon dioxide 3 and can - optionally - be further filled with water which can be carried via a closable conduit 16 into space 15. Filling with water generally results in an improved instantaneous pressure increase in supply container 2, and therefore explosion of supply container 2.
  • heating element 5 is formed by an ignitable substance comprising for instance potassium perchlorate, ammonium oxalate, salicylic acid and castor oil.
  • Casing 4 can optionally be provided with one or more weakened portions in order to be able to impart some direction to the explosion.
  • Activating element 7 connects to an end surface of heating element 5 and provides for an electrical ignition of heating element 5, wherein the mass of lance 9 is used as neutral element.
  • Supply container 2 further comprises coupling means 17 for coupling supply container 2 to counter-coupling means forming part of lance 9.
  • a pivotable connection can optionally be realized here.
  • the area surrounding the carbon dioxide 3 can be cooled and/or insulated. Use can for instance be made here of a double-walled casing. In this exemplary embodiment cooling is however realized by creating a water mist 19 around supply container 2 via lance 9 and via a spray nozzle 18 connecting to lance 9.
  • FIG 4 shows a perspective, partially cut-away view of a boiler 22 in which a part of a device 23 according to the invention is arranged.
  • Boiler 22 is provided with a plurality of heat-exchanging pipes 24 for efficient use of heat produced in boiler 22.
  • Device 23 is arranged in boiler 22 via a hatch 25 arranged in boiler 22.
  • Device 23 is held in position here by means of a carrier structure 26.
  • Device 23 comprises an explodable plastic supply container 27, which supply container 27 is partially filled with solid carbon dioxide 28 arranged as beads in supply container 27.
  • Supply container 27 initially takes a substantially closed form here.
  • a heating element (heat source) 29 which is connected via a power cable 30 to an activating element (not shown) situated in the shown embodiment in carrier structure 26.
  • Power cable 30 is enclosed by a hollow, substantially rigid lance 31 to enable accurate positioning of supply container 27 between pipes 24 (see figure 5). Following manual and/or automatic activation of the activating element the heating element 29 will be switched on, whereby the solid carbon dioxide 28 in the supply container will sublime, whereby pressure buildup takes place. When the pressure buildup is sufficiently high, the supply container will explode (burst apart), wherein a shock wave is released which is so powerful that contaminants deposited in boiler 22, in particular on pipes 24, will be dislodged from walls of boiler 22, in particular from pipes 24, whereby a rapid, effective and controlled cleaning of boiler 22 can be realized.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning In General (AREA)

Abstract

L'invention porte sur un dispositif et sur un procédé pour nettoyer des éléments d'installation industrielle, dans lesquels un récipient d'alimentation en produits explosifs (2) rempli de dioxyde de carbone solide (3) comprend une source de chaleur (5) pour sublimer le dioxyde de carbone et un élément d'activation (7) pour activer la source de chaleur.
PCT/NL2012/050587 2011-08-29 2012-08-28 Dispositif et procédé pour nettoyer des éléments d'installation industrielle Ceased WO2013032323A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2007314A NL2007314C2 (nl) 2011-08-29 2011-08-29 Inrichting en werkwijze voor het reinigen van industriele installatiecomponenten.
NL2007314 2011-08-29

Publications (1)

Publication Number Publication Date
WO2013032323A1 true WO2013032323A1 (fr) 2013-03-07

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Application Number Title Priority Date Filing Date
PCT/NL2012/050587 Ceased WO2013032323A1 (fr) 2011-08-29 2012-08-28 Dispositif et procédé pour nettoyer des éléments d'installation industrielle

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Country Link
NL (1) NL2007314C2 (fr)
WO (1) WO2013032323A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104456589A (zh) * 2014-10-22 2015-03-25 江苏太湖锅炉股份有限公司 立式余热锅炉激波吹灰器的布置结构
FR3028027A1 (fr) * 2014-11-04 2016-05-06 Explotek Dispositif de maintien et de mise a feu d'une matiere explosive d'une chaine pyrotechnique
WO2020249869A1 (fr) * 2019-06-12 2020-12-17 Lassila & Tikanoja Oyj Dispositif et procédé de nettoyage avec une matière explosive
WO2021160940A1 (fr) * 2020-02-16 2021-08-19 Konetuuli Oy Dispositif de décrassage en ligne
TWI803494B (zh) * 2017-05-24 2023-06-01 瑞士商班與克寧有限公司 用來清潔容器和設施之內部的裝置及方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB260440A (fr) *
GB332196A (en) * 1929-04-11 1930-07-11 David Hodge Improvements in blasting cartridges
GB339983A (en) * 1929-09-14 1930-12-15 David Hodge Improvements in and relating to blasting cartridges
GB500938A (en) * 1937-10-05 1939-02-17 Cardox Great Britain Ltd Method of cleaning out slag or cinder pockets of open hearth combustion furnaces
US2839435A (en) * 1955-04-05 1958-06-17 Union Carbide Corp Method of reactor product removal by explosive means
WO1997025520A1 (fr) * 1996-01-13 1997-07-17 Cardox International Limited Appareil de maintien d'un dispositif de desagregation de materiaux
NL1016149C1 (nl) 1997-01-17 2000-10-19 Northamerican Ind Services Inrichting, systeem en werkwijze voor het tijdens de werking explosief ontslakken.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB260440A (fr) *
GB332196A (en) * 1929-04-11 1930-07-11 David Hodge Improvements in blasting cartridges
GB339983A (en) * 1929-09-14 1930-12-15 David Hodge Improvements in and relating to blasting cartridges
GB500938A (en) * 1937-10-05 1939-02-17 Cardox Great Britain Ltd Method of cleaning out slag or cinder pockets of open hearth combustion furnaces
US2839435A (en) * 1955-04-05 1958-06-17 Union Carbide Corp Method of reactor product removal by explosive means
WO1997025520A1 (fr) * 1996-01-13 1997-07-17 Cardox International Limited Appareil de maintien d'un dispositif de desagregation de materiaux
NL1016149C1 (nl) 1997-01-17 2000-10-19 Northamerican Ind Services Inrichting, systeem en werkwijze voor het tijdens de werking explosief ontslakken.
EP1216391A1 (fr) * 1997-01-17 2002-06-26 NorthAmerican Industrial Services, Inc. (NAIS) Dispositif, systeme, et procede de decrassage a explosif ne necessitant pas l'arret de l'installation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104456589A (zh) * 2014-10-22 2015-03-25 江苏太湖锅炉股份有限公司 立式余热锅炉激波吹灰器的布置结构
FR3028027A1 (fr) * 2014-11-04 2016-05-06 Explotek Dispositif de maintien et de mise a feu d'une matiere explosive d'une chaine pyrotechnique
TWI803494B (zh) * 2017-05-24 2023-06-01 瑞士商班與克寧有限公司 用來清潔容器和設施之內部的裝置及方法
WO2020249869A1 (fr) * 2019-06-12 2020-12-17 Lassila & Tikanoja Oyj Dispositif et procédé de nettoyage avec une matière explosive
EP3983143A4 (fr) * 2019-06-12 2023-06-28 L&T Teollisuuspalvelut Oy Dispositif et procédé de nettoyage avec une matière explosive
WO2021160940A1 (fr) * 2020-02-16 2021-08-19 Konetuuli Oy Dispositif de décrassage en ligne

Also Published As

Publication number Publication date
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