EP1528318B1 - Verfahren zur Reinigung der Wärmeaustauschflächen im Betrieb befindlicher Öfen - Google Patents

Verfahren zur Reinigung der Wärmeaustauschflächen im Betrieb befindlicher Öfen 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
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.)
Expired - Lifetime
Application number
EP03292721A
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English (en)
French (fr)
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EP1528318A1 (de
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/de
Priority to AT03292721T priority patent/ATE363631T1/de
Priority to DE60314147T priority patent/DE60314147T2/de
Priority to ES03292721T priority patent/ES2286394T3/es
Priority to PCT/FR2004/002747 priority patent/WO2005045315A1/fr
Publication of EP1528318A1 publication Critical patent/EP1528318A1/de
Application granted granted Critical
Publication of EP1528318B1 publication Critical patent/EP1528318B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Claims (9)

  1. Verfahren zur Reinigung von Oberflächen (2) im Betrieb befindlicher Öfen (1), insbesondere von metallenen Wärmeaustauschflächen auf der Rauchseite von Industrieöfen sowie von Industriekesseln, bei dem die folgenden Schritte durchgeführt werden:
    - Erzeugen eines Gasstrahls, der auf die zu reinigenden Oberflächen gerichtet wird,
    - Einfügen von Partikeln (6) im Festzustand in den Gasstrahl und Aufspritzen der Partikel mit einer solchen Geschwindigkeit, dass die Partikel zerstört werden, wenn sie mit den genannten zu reinigenden Oberflächen in Kontakt kommen,
    - Bewegen des Gas- und Partikelstrahls über die zu reinigenden Oberflächen,
    wobei das Verfahren dadurch gekennzeichnet ist, dass Partikel verwendet werden, deren Formulierung mehrheitlich aus Carbamid besteht.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass mindestens 95% Carbamid in die Formulierung der Partikel eingebracht wird.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass der Formulierung der Partikel ein Magnesiumsalz hinzugefügt wird.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass der Formulierung der Partikel zwischen 0,5% und 5% Magnesiumsalz hinzugefügt wird.
  5. Verfahren nach Anspruch 3 oder Anspruch 4, dadurch gekennzeichnet, dass der Formulierung der Partikel Magnesiumcarbonat hinzugefügt wird.
  6. Verfahren nach Anspruch 3 oder Anspruch 4, dadurch gekennzeichnet, dass der Formulierung der Partikel Magnesiumsilikat hinzugefügt wird.
  7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ofen derart geregelt wird, dass die Temperatur der zu reinigen Oberflächen über 250°C beträgt.
  8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Geschwindigkeit, mit der die Partikel gegen die zu reinigenden Oberflächen gespritzt werden, mindestens 50 m.s-1 beträgt.
  9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei einer ein zu erwärmendes Fluid umschließenden Leitung, die sich im Inneren des Ofens zwischen einem ersten Ende (2a) und einem zweiten Ende (2b) erstreckt, der Fluidstrahl von dem ersten Ende zum zweiten Ende bewegt wird.
EP03292721A 2003-10-30 2003-10-30 Verfahren zur Reinigung der Wärmeaustauschflächen im Betrieb befindlicher Öfen Expired - Lifetime EP1528318B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP03292721A EP1528318B1 (de) 2003-10-30 2003-10-30 Verfahren zur Reinigung der Wärmeaustauschflächen im Betrieb befindlicher Öfen
AT03292721T ATE363631T1 (de) 2003-10-30 2003-10-30 Verfahren zur reinigung der wärmeaustauschflächen im betrieb befindlicher öfen
DE60314147T DE60314147T2 (de) 2003-10-30 2003-10-30 Verfahren zur Reinigung der Wärmeaustauschflächen im Betrieb befindlicher Öfen
ES03292721T ES2286394T3 (es) 2003-10-30 2003-10-30 Procedimiento de limpieza en marcha de las superficies de intercambio termico de hornos.
PCT/FR2004/002747 WO2005045315A1 (fr) 2003-10-30 2004-10-26 Procede de nettoyage en marche des surfaces d'echange thermique de fours

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03292721A EP1528318B1 (de) 2003-10-30 2003-10-30 Verfahren zur Reinigung der Wärmeaustauschflächen im Betrieb befindlicher Öfen

Publications (2)

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

Family

ID=34400590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03292721A Expired - Lifetime EP1528318B1 (de) 2003-10-30 2003-10-30 Verfahren zur Reinigung der Wärmeaustauschflächen im Betrieb befindlicher Öfen

Country Status (5)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005032818B4 (de) * 2005-07-12 2007-07-19 BRÜNDERMANN, Georg Verfahren zur Reinigung von Kraftwerkskesseln
JP5079465B2 (ja) * 2007-11-21 2012-11-21 新日鉄エンジニアリング株式会社 ショットクリーニング装置及びショットクリーニング装置のショット球回収方法
KR101748802B1 (ko) * 2016-10-18 2017-06-19 주식회사 지스코 수트 블로워 및 이를 이용한 튜브형 열 교환기의 세정 방법
CN110925958B (zh) * 2018-09-20 2021-07-27 青岛海尔智能技术研发有限公司 一种空调器及清洁控制方法
RU2707512C1 (ru) * 2019-07-11 2019-11-27 Общество с ограниченной ответственностью "ЛУКОЙЛ-Нижегородниинефтепроект" Средство для очистки поверхности теплообмена печей и котлов методом бластинга
CN110793051A (zh) * 2019-11-19 2020-02-14 云南永昌硅业股份有限公司 一种矿热炉上升烟道清理积灰的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL132465C (de) * 1967-11-24
FR2650384B1 (fr) * 1989-07-28 1994-07-22 Petroles Cie Techniques Procede de nettoyage de surfaces chaudes de fours, ainsi qu'une installation et des granules pour sa mise en oeuvre
US6186869B1 (en) * 1999-02-12 2001-02-13 Cetek Limited Cleaning using welding lances and blasting media

Also Published As

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

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