EP1528318B1 - Method of cleaning heat exchange surfaces in operating furnaces - Google Patents

Method of cleaning heat exchange surfaces in operating furnaces Download PDF

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Publication number
EP1528318B1
EP1528318B1 EP03292721A EP03292721A EP1528318B1 EP 1528318 B1 EP1528318 B1 EP 1528318B1 EP 03292721 A EP03292721 A EP 03292721A EP 03292721 A EP03292721 A EP 03292721A EP 1528318 B1 EP1528318 B1 EP 1528318B1
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EP
European Patent Office
Prior art keywords
particles
formulation
cleaning
jet
added
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Expired - Lifetime
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EP03292721A
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German (de)
French (fr)
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EP1528318A1 (en
Inventor
Henri Ballereau
Philippe Barre
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CTP ENVIRONNEMENT
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CTP ENVIRONNEMENT
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Application filed by CTP ENVIRONNEMENT filed Critical CTP ENVIRONNEMENT
Priority to EP03292721A priority Critical patent/EP1528318B1/en
Priority to DE60314147T priority patent/DE60314147T2/en
Priority to ES03292721T priority patent/ES2286394T3/en
Priority to AT03292721T priority patent/ATE363631T1/en
Priority to PCT/FR2004/002747 priority patent/WO2005045315A1/en
Publication of EP1528318A1 publication Critical patent/EP1528318A1/en
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Classifications

    • 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
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
    • F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
    • 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
    • F23J3/023—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the fireside of watertubes in boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • 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
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the invention relates to a method for cleaning the surfaces of ovens, particularly metal heat exchange surfaces on the fume side of industrial furnaces, such as petroleum refining and petrochemical furnaces, as well as industrial boilers.
  • Such furnaces often use heavy fuel oil as fuel for economic reasons. Since the combustion of heavy fuel oil is incomplete, deposits are formed on the heat exchange surfaces. These deposits consist in particular of heavy fractions of hydrocarbons, silica, heavy metals and stable components maintaining a solid state inside the oven, even at high temperature. Similar problems can also be seen with other liquid or gaseous fuels.
  • the particles remove the deposition by an oxidizing chemical effect and a mechanical effect due to the speed of the particles which only sublimate after coming into contact with the surfaces to be cleaned.
  • the invention therefore aims to propose a solution solving these problems, while being cheap and maintaining good efficiency to eliminate the deposit.
  • particles are used whose formulation consists mainly (more than 50% by weight) of carbamide.
  • Carbamide (urea) is inexpensive and is obtained without major difficulty in the form of solid beads.
  • carbamide is not an oxidant, it has been shown to be more effective at removing deposits than previously used products and overall less polluting.
  • the presence in greater quantity of the carbamide in the formulation makes it possible to obtain a melting temperature of the formulation which is sufficiently high so that the particles are not sublimated before coming into contact with the surfaces to be cleaned, but also sufficiently low for to neutralize the acidic compounds of the deposit, to weaken by chemical action the physical structure of the deposit, then to sublimate or vaporise entirely under the heat of the combustion gases.
  • carbamide according to the invention at least 95% of carbamide (by weight) is introduced into the formulation of the particles.
  • a magnesium salt advantageously magnesium carbonate or magnesium silicate, is added to the formulation of the particles.
  • the magnesium salt makes it possible to sequester the moisture and to avoid agglomeration of the particles and clogging of the device generating the jet of gas.
  • magnesium captures vanadium, which is often present in deposits and causes corrosion of heat exchange surfaces.
  • it allows slightly increase the melting temperature of the particles, which further improves the cleaning efficiency.
  • magnesium salt is added to the weight of the formulation of the particles.
  • the furnace is adjusted so that the temperature of said surfaces to be cleaned is greater than 250 ° C.
  • the formulation changes state by coming into contact with the surfaces to be cleaned, which makes it much more efficient to react with the components of the deposit.
  • the particles are advantageously sprayed in contact with the surfaces to be cleaned at a speed of at least 50 ms -1 .
  • the attached figure shows schematically a method of cleaning tubes 2 of a cylindrical kiln 1 of a petroleum refining unit.
  • the oven 1 is kept in operation, heated by a burner (not shown).
  • the tubes 2 extend inside the furnace between a first end 2a and a second end 2b. Hydrocarbons circulating in said tubes 2 are heated between these two ends by heat exchange with the combustion gases.
  • This rod 4 is passed an injection rod 4 through an opening 8 formed in the wall 10 of the oven. This rod projects solid particles 6 against one of the tubes.
  • This rod 4 is supplied with 4 compressed air at a pressure of about 5 to 10 bar and solid particles 6 by a device provided for this purpose.
  • the particles 6 are substantially spherical and have a size of between 1 and 5 millimeters, advantageously between 2 and 4 millimeters. They reach the tube 2 at a speed of at least 50m.s -1 , advantageously between 100m.s -1 and 200m.s -1 .
  • the formulation of the particles preferably contains about 98% carbamide - (NH 2 ) 2 CO - and about 2% magnesium carbonate, by weight.
  • the acid derivatives of the deposit are neutralized by the gases resulting from the decomposition of the formulation, which generates a release of sulfur oxide, nitrogen and water vapor.
  • the user then moves the injection rod, as illustrated by the arrow 12, between the first 2a and the second 2b end of the tube 2, to remove the deposit on the entire tube. If necessary, the cane is passed through other existing or specially created openings in the walls of the furnace and proceeds in a similar manner with the other tubes 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Treating Waste Gases (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

The method involves generating a gas stream to be directed towards tubes (2) of a furnace (1), and producing solid particles (6) from a composition constituted of ninety five percent of urea. The solid particles are integrated with the gas stream and the particles are projected at a speed such that they disintegrate when they contact the tubes. The gas stream and the particles are moved along the tubes.

Description

L'invention concerne un procédé de nettoyage en marche des surfaces de fours, en particulier des surfaces métalliques d'échange thermique côté fumées de fours industriels, tels que des fours de raffinage pétrolier et de pétrochimie, ainsi que de chaudières industrielles.The invention relates to a method for cleaning the surfaces of ovens, particularly metal heat exchange surfaces on the fume side of industrial furnaces, such as petroleum refining and petrochemical furnaces, as well as industrial boilers.

De tels fours utilisent souvent le fioul lourd comme combustible pour des raisons économiques. Or, la combustion du fioul lourd étant incomplète, il se forme des dépôts sur les surfaces d'échanges thermiques. Ces dépôts sont notamment constitués de fractions lourdes d'hydrocarbures, de silice, de métaux lourds et de composants stables conservant un état solide à l'intérieur du four, même à haute température. Des problèmes similaires peuvent également être constatés avec d'autres combustibles liquides ou gazeux.Such furnaces often use heavy fuel oil as fuel for economic reasons. Since the combustion of heavy fuel oil is incomplete, deposits are formed on the heat exchange surfaces. These deposits consist in particular of heavy fractions of hydrocarbons, silica, heavy metals and stable components maintaining a solid state inside the oven, even at high temperature. Similar problems can also be seen with other liquid or gaseous fuels.

Ces dépôts réduisent considérablement les échanges thermiques entre les gaz de combustion et le fluide à chauffer, ce qui génère une perte de rendement du four.These deposits considerably reduce the heat exchange between the combustion gases and the fluid to be heated, which generates a loss of efficiency of the furnace.

On connaît déjà diverses techniques permettant de nettoyer les surfaces d'échanges thermiques du four, tout en maintenant le four en activité. En particulier, EP-A-0 410 867 divulgue de réaliser les étapes suivantes :

  • générer un jet de gaz que l'on dirige vers les surfaces à nettoyer,
  • intégrer des particules à l'état solide au jet de fluide, projeter les particules à une vitesse telle que les particules se désintègrent en venant au contact desdites surfaces à nettoyer,
  • déplacer le jet de fluide et de particules le long des surfaces à nettoyer.
Various techniques are already known for cleaning the heat exchange surfaces of the oven while maintaining the oven in operation. In particular, EP-A-0 410 867 discloses carrying out the following steps:
  • generating a jet of gas that is directed towards the surfaces to be cleaned,
  • integrating particles in the solid state with the jet of fluid, projecting the particles at a speed such that the particles disintegrate by coming into contact with said surfaces to be cleaned,
  • move the jet of fluid and particles along the surfaces to be cleaned.

Les particules éliminent le dépôt par un effet chimique oxydant et par un effet mécanique dû à la vitesse des particules qui ne se subliment qu'après être entrées en contact avec les surfaces à nettoyer.The particles remove the deposition by an oxidizing chemical effect and a mechanical effect due to the speed of the particles which only sublimate after coming into contact with the surfaces to be cleaned.

Toutefois, ce procédé pose de gros problèmes de sécurité pour l'approvisionnement en agent oxydant dans la mesure où le plus satisfaisant est constitué par du nitrate d'ammonium, lequel peut constituer avec d'autres produits un puissant explosif. Un procédé similaire qui utilise des particules solides de formaldéhyde d'urée est connu du document US 6 186 869 B.However, this process poses major safety problems for the supply of oxidizing agent to the extent that the most satisfactory is constituted by ammonium nitrate, which can constitute with other products a powerful explosive. A similar process which uses solid particles of urea formaldehyde is known from US 6 186 869 B.

L'invention vise par conséquent à proposer une solution résolvant ces problèmes, tout en étant bon marché et en conservant une bonne efficacité pour éliminer le dépôt.The invention therefore aims to propose a solution solving these problems, while being cheap and maintaining good efficiency to eliminate the deposit.

Pour ce faire, conformément à l'invention, on utilise des particules à dont la formulation est constituée majoritairement (plus de 50% en poids) de carbamide.To do this, according to the invention, particles are used whose formulation consists mainly (more than 50% by weight) of carbamide.

La carbamide (urée) est bon marché et s'obtient sans difficulté majeure sous forme de billes solides. En outre, bien que la carbamide ne soit pas un oxydant, elle s'est révélée plus efficace pour éliminer les dépôts que les produits précédemment utilisés et globalement moins polluante. Enfin, la présence en majeure quantité de la carbamide dans la formulation permet d'obtenir une température de fusion de la formulation suffisamment élevée pour que les particules ne soient pas sublimées avant d'entrer au contact des surfaces à nettoyer, mais également suffisamment basse pour neutraliser les composés acides du dépôt, pour fragiliser par action chimique la structure physique du dépôt, puis pour se sublimer ou se vaporiser entièrement sous la chaleur des gaz de combustion.Carbamide (urea) is inexpensive and is obtained without major difficulty in the form of solid beads. In addition, although carbamide is not an oxidant, it has been shown to be more effective at removing deposits than previously used products and overall less polluting. Finally, the presence in greater quantity of the carbamide in the formulation makes it possible to obtain a melting temperature of the formulation which is sufficiently high so that the particles are not sublimated before coming into contact with the surfaces to be cleaned, but also sufficiently low for to neutralize the acidic compounds of the deposit, to weaken by chemical action the physical structure of the deposit, then to sublimate or vaporise entirely under the heat of the combustion gases.

Compte tenu des avantages procurés par la carbamide, conformément à l'invention, on introduit au moins 95% de carbamide (en poids) dans la formulation des particules.In view of the advantages provided by the carbamide according to the invention, at least 95% of carbamide (by weight) is introduced into the formulation of the particles.

Seuls quelques additifs seront ainsi ajoutés en faible quantité pour une action ciblée.Only a few additives will be added in small quantities for a targeted action.

En particulier, conformément à l'invention, on ajoute un sel de magnésium, avantageusement du carbonate de magnésium ou du silicate de magnésium à la formulation des particules.In particular, according to the invention, a magnesium salt, advantageously magnesium carbonate or magnesium silicate, is added to the formulation of the particles.

La carbamide étant hygroscopique, le sel de magnésium permet de séquestrer l'humidité et d'éviter l'agglomération des particules et l'obturation du dispositif générant le jet de gaz. De plus, le magnésium capte le vanadium qui est souvent présent dans les dépôts et qui provoque la corrosion des surfaces d'échange thermique. En outre, il permet d'augmenter légèrement la température de fusion des particules, ce qui améliore encore l'efficacité du nettoyage.Since the carbamide is hygroscopic, the magnesium salt makes it possible to sequester the moisture and to avoid agglomeration of the particles and clogging of the device generating the jet of gas. In addition, magnesium captures vanadium, which is often present in deposits and causes corrosion of heat exchange surfaces. In addition, it allows slightly increase the melting temperature of the particles, which further improves the cleaning efficiency.

Avantageusement, on ajoute entre 0,5% et 5% de sel de magnésium au poids de la formulation des particules.Advantageously, between 0.5% and 5% of magnesium salt is added to the weight of the formulation of the particles.

Cette proportion permet d'obtenir une efficacité satisfaisante tout en ne générant qu'une quantité minimale de résidus solides. En effet, une partie du sel de magnésium n'est pas vaporisé et tombe sur la sole du four avec une partie des dépôts détachés des surfaces nettoyées.This proportion makes it possible to obtain satisfactory efficiency while generating only a minimal amount of solid residues. Indeed, a portion of the magnesium salt is not vaporized and falls on the oven floor with some of the deposits detached from the cleaned surfaces.

Conformément à une autre caractéristique avantageuse de l'invention pour obtenir une bonne efficacité de la formulation, on règle le four de sorte que la température desdites surfaces à nettoyer soit supérieure à 250°C.According to another advantageous characteristic of the invention for obtaining a good effectiveness of the formulation, the furnace is adjusted so that the temperature of said surfaces to be cleaned is greater than 250 ° C.

Ainsi, la formulation, et en particulier la carbamide, change d'état en entrant au contact des surfaces à nettoyer, ce qui la rend beaucoup plus performante pour réagir avec les composants du dépôt.Thus, the formulation, and in particular the carbamide, changes state by coming into contact with the surfaces to be cleaned, which makes it much more efficient to react with the components of the deposit.

En outre, avantageusement on projette les particules au contact des surfaces à nettoyer à une vitesse d'au moins 50 m.s-1.In addition, the particles are advantageously sprayed in contact with the surfaces to be cleaned at a speed of at least 50 ms -1 .

On obtient ainsi une désintégration satisfaisante des particules solides de la formulation, ce qui améliore encore son efficacité et assure un nettoyage encore meilleur desdites surfaces par effet mécanique et chimique.This gives a satisfactory disintegration of the solid particles of the formulation, which further improves its efficiency and ensures an even better cleaning of said surfaces by mechanical and chemical effect.

La figure jointe représente schématiquement un procédé de nettoyage de tubes 2 d'un four cylindrique 1 d'une unité de raffinage pétrolier.The attached figure shows schematically a method of cleaning tubes 2 of a cylindrical kiln 1 of a petroleum refining unit.

Le four 1 est maintenu en fonctionnement, chauffé par un brûleur (non représenté). Les tubes 2 s'étendent à l'intérieur du four entre une première extrémité 2a et une deuxième extrémité 2b. Des hydrocarbures circulant dans lesdites tubes 2 sont chauffés entre ces deux extrémités par échange de chaleur avec les gaz de combustion.The oven 1 is kept in operation, heated by a burner (not shown). The tubes 2 extend inside the furnace between a first end 2a and a second end 2b. Hydrocarbons circulating in said tubes 2 are heated between these two ends by heat exchange with the combustion gases.

La présence d'un dépôt sur l'extérieur des tubes 2 isole thermiquement le fluide à réchauffer (ici les hydrocarbures) des gaz de combustion, ce qui nécessite d'augmenter la puissance délivrée par le brûleur pour maintenir le même échange thermique.The presence of a deposit on the outside of the tubes 2 thermally isolates the fluid to be heated (here hydrocarbons) combustion, which requires increasing the power delivered by the burner to maintain the same heat exchange.

Pour détacher ce dépôt, on fait passer une canne d'injection 4 à travers une ouverture 8 ménagée dans la paroi 10 du four. Cette canne projette des particules solides 6 contre l'un des tubes. Cette canne 4 est alimentée 4 en air comprimé à une pression d'environ 5 à 10 bar et en particules solides 6 par un appareil prévu à cet effet.To detach this deposit, is passed an injection rod 4 through an opening 8 formed in the wall 10 of the oven. This rod projects solid particles 6 against one of the tubes. This rod 4 is supplied with 4 compressed air at a pressure of about 5 to 10 bar and solid particles 6 by a device provided for this purpose.

Les particules 6 sont sensiblement sphériques et ont une dimension comprise entre 1 et 5 millimètres, avantageusement entre 2 et 4 millimètres. Elles atteignent le tube 2 à une vitesse d'au moins 50m.s-1, avantageusement entre 100m.s-1 et 200m.s-1. La formulation des particules contient de préférence environ 98% de carbamide - (NH2)2CO - et environ 2% de carbonate de magnésium, en poids. En entrant en contact avec le tube 2 dont la température est d'au moins 250°C, les particules 6 détachent une partie du dépôt, toute la carbamide contenue dans les particules se vaporise et seule une très faible quantité de résidus solides tombe sur la sole du four.The particles 6 are substantially spherical and have a size of between 1 and 5 millimeters, advantageously between 2 and 4 millimeters. They reach the tube 2 at a speed of at least 50m.s -1 , advantageously between 100m.s -1 and 200m.s -1 . The formulation of the particles preferably contains about 98% carbamide - (NH 2 ) 2 CO - and about 2% magnesium carbonate, by weight. By coming into contact with the tube 2 whose temperature is at least 250 ° C., the particles 6 detach part of the deposit, all the carbamide contained in the particles vaporizes and only a very small amount of solid residues falls on the oven sole.

Les dérivés acides du dépôt sont neutralisés par les gaz issus de la décomposition de la formulation, ce qui génère un dégagement d'oxyde de soufre, d'azote et de vapeur d'eau. L'utilisateur déplace alors la canne d'injection, tel qu'illustré par la flèche 12, entre la première 2a et la deuxième 2b extrémité du tube 2, afin de retirer le dépôt sur l'ensemble du tube. Au besoin, il fait passer la canne par d'autres ouvertures existantes ou spécialement créées dans les parois du four et il procède de manière analogue avec les autres tubes 2.The acid derivatives of the deposit are neutralized by the gases resulting from the decomposition of the formulation, which generates a release of sulfur oxide, nitrogen and water vapor. The user then moves the injection rod, as illustrated by the arrow 12, between the first 2a and the second 2b end of the tube 2, to remove the deposit on the entire tube. If necessary, the cane is passed through other existing or specially created openings in the walls of the furnace and proceeds in a similar manner with the other tubes 2.

Claims (9)

  1. A method of cleaning surfaces (2) of furnaces (1) in operation, in particular the flue gas side of metal heat-exchange surfaces in industrial furnaces, and also in industrial boilers, which method comprises the following steps:
    · generating a jet of gas that is directed towards the surfaces to be cleaned;
    · integrating particles (6) in the solid state in the jet of gas and projecting the particles at a speed such that the particles disintegrate on coming into contact with said surfaces for cleaning; and
    · moving the jet of gas and particles along the surfaces to be cleaned;
    said method being characterized in that the particles used have a formulation that is constituted by a majority of carbamide.
  2. A method according to claim 1, characterized in that at least 95% of carbamide is introduced into the formulation of the particles.
  3. A method according to claim 1 or claim 2, characterized in that a magnesium salt is added to the formulation of the particles.
  4. A method according to claim 3, characterized in that 0.5% to 5% of magnesium salt is added to the formulation of the particles.
  5. A method according to claim 3 or claim 4, characterized in that magnesium carbonate is added to the formulation of the particles.
  6. A method according to claim 3 or claim 4, characterized in that magnesium silicate is added to the formulation of the particles.
  7. A method according to any preceding claim, characterized in that the furnace is adjusted so that the temperature of the surfaces for cleaning is higher than 250°C.
  8. A method according to any preceding claim, characterized in that the particles are projected into contact with the surfaces for cleaning at a speed of at least 50 m.s-1
  9. A method according to any preceding claim, characterized in that for a duct containing a fluid to be heated and extending inside the furnace between a first end (2a) and a second end (2b), the fluid jet is moved from the first end to the second end.
EP03292721A 2003-10-30 2003-10-30 Method of cleaning heat exchange surfaces in operating furnaces Expired - Lifetime EP1528318B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP03292721A EP1528318B1 (en) 2003-10-30 2003-10-30 Method of cleaning heat exchange surfaces in operating furnaces
DE60314147T DE60314147T2 (en) 2003-10-30 2003-10-30 Process for cleaning the heat exchange surfaces of operating furnaces
ES03292721T ES2286394T3 (en) 2003-10-30 2003-10-30 CLEANING PROCEDURE ON THE OVEN THERMAL EXCHANGE SURFACES.
AT03292721T ATE363631T1 (en) 2003-10-30 2003-10-30 METHOD FOR CLEANING THE HEAT EXCHANGE SURFACES OF OVENS IN OPERATION
PCT/FR2004/002747 WO2005045315A1 (en) 2003-10-30 2004-10-26 Method of cleaning the heat exchange surfaces of an operating furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03292721A EP1528318B1 (en) 2003-10-30 2003-10-30 Method of cleaning heat exchange surfaces in operating furnaces

Publications (2)

Publication Number Publication Date
EP1528318A1 EP1528318A1 (en) 2005-05-04
EP1528318B1 true EP1528318B1 (en) 2007-05-30

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ID=34400590

Family Applications (1)

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EP03292721A Expired - Lifetime EP1528318B1 (en) 2003-10-30 2003-10-30 Method of cleaning heat exchange surfaces in operating furnaces

Country Status (5)

Country Link
EP (1) EP1528318B1 (en)
AT (1) ATE363631T1 (en)
DE (1) DE60314147T2 (en)
ES (1) ES2286394T3 (en)
WO (1) WO2005045315A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005032818B4 (en) * 2005-07-12 2007-07-19 BRÜNDERMANN, Georg Process for cleaning power plant boilers
JP5079465B2 (en) * 2007-11-21 2012-11-21 新日鉄エンジニアリング株式会社 Shot cleaning device and shot ball collecting method of shot cleaning device
KR101748802B1 (en) * 2016-10-18 2017-06-19 주식회사 지스코 Soot blower and method for cleaning tubular heat exchanger using thereof
CN110925958B (en) * 2018-09-20 2021-07-27 青岛海尔智能技术研发有限公司 Air conditioner and cleaning control method
RU2707512C1 (en) * 2019-07-11 2019-11-27 Общество с ограниченной ответственностью "ЛУКОЙЛ-Нижегородниинефтепроект" Apparatus for cleaning furnace and boilers heat exchange surfaces by blasting method
CN110793051A (en) * 2019-11-19 2020-02-14 云南永昌硅业股份有限公司 Method for cleaning deposited ash in ascending flue of submerged arc furnace

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL132465C (en) * 1967-11-24
FR2650384B1 (en) * 1989-07-28 1994-07-22 Petroles Cie Techniques PROCESS FOR CLEANING HOT OVEN SURFACES, AS WELL AS A PLANT AND GRANULES FOR IMPLEMENTING SAME
US6186869B1 (en) * 1999-02-12 2001-02-13 Cetek Limited Cleaning using welding lances and blasting media

Also Published As

Publication number Publication date
WO2005045315A1 (en) 2005-05-19
DE60314147T2 (en) 2008-01-24
EP1528318A1 (en) 2005-05-04
ATE363631T1 (en) 2007-06-15
ES2286394T3 (en) 2007-12-01
DE60314147D1 (en) 2007-07-12

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