EP3390908A1 - Procédé de nettoyage de surfaces de transfert de chaleur d'une salle des machines - Google Patents

Procédé de nettoyage de surfaces de transfert de chaleur d'une salle des machines

Info

Publication number
EP3390908A1
EP3390908A1 EP16874973.7A EP16874973A EP3390908A1 EP 3390908 A1 EP3390908 A1 EP 3390908A1 EP 16874973 A EP16874973 A EP 16874973A EP 3390908 A1 EP3390908 A1 EP 3390908A1
Authority
EP
European Patent Office
Prior art keywords
slag
particles
cleaned
blasting
metal
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.)
Granted
Application number
EP16874973.7A
Other languages
German (de)
English (en)
Other versions
EP3390908B1 (fr
EP3390908A4 (fr
Inventor
Hannu LAITOMAA
Juuso LAITOMAA
Janne LAITOMAA
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.)
Clean Steel International Oy
Original Assignee
Clean Steel Pori Oy
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=59055950&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP3390908(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Clean Steel Pori Oy filed Critical Clean Steel Pori Oy
Priority to PL16874973T priority Critical patent/PL3390908T3/pl
Publication of EP3390908A1 publication Critical patent/EP3390908A1/fr
Publication of EP3390908A4 publication Critical patent/EP3390908A4/fr
Application granted granted Critical
Publication of EP3390908B1 publication Critical patent/EP3390908B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • 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
    • F28G1/12—Fluid-propelled scrapers, bullets, or like solid bodies
    • 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
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler

Definitions

  • the present invention relates to a method according to the preamble of claim 1 of cleaning the heat-transfer surface which is in connection to the masonry structure of a combustion boiler.
  • the surface is cleaned by blasting solid particles onto it.
  • the present invention also relates to the use according to Claim 15.
  • the heat-transfer surfaces of power plants are typically cleaned by using sandblasting.
  • sand typically screened sand
  • water is used to bind the fines, in order to prevent dusting caused by the sand particles.
  • This wet blasting method has proven to be problematic in several respects.
  • the masonries absorb moisture.
  • the heating phase of the startup stage is extended because the masonries must be "dried". In such cases, it is quite possible that the masonries will fail.
  • various alternatives are described for using sand in the blasting.
  • Such materials include steel grains and steel sand, copper slag, glass beads, metal pellets, dry ice, corundum and even ground coconut shells and corn grains.
  • CN Patent Application Publication No. 102313288 describes a solution in which heat- transfer surfaces are cleaned using smooth-surface particles.
  • the particles described in the publication are metal or non-metal particles or composite particles having a density of 2-8 g/cm 3 .
  • DE Patent Application Publication No. 19723389 describes cleaning of the inner part of the boiler plants where the combustion gases are by using spherical steel particles.
  • JP Patent Application Publication No. 2002098323 describes the use of granulated slag grains to remove, by using blast cleaning, the metal residues which are adhered to the exhaust pipe of an electric furnace.
  • the metal is generated when melting, in an electric furnace, the burning residues which are generated from burning of municipal waste.
  • alkali metal carbonates provide efficient cleaning of surfaces, without formation of dust or damaging the surfaces.
  • Suitable materials mentioned in the publication are in particular natural carbonates, such as calcium carbonate and dolomite. These may be used, for example, to remove paint, foodstuff and drug residues from the inner
  • the heat-transfer surface of the combustion boiler is cleaned by blasting onto it, in water-free conditions, metal slag particles having a particle size of approximately 0.3-3.0 mm, and by using a blasting pressure of 8-12 bar.
  • the present invention also comprises the use of metal slag particles for cleaning of the heat-transfer surface which is in connection to a masonry structure, by using blasting treatment.
  • the method according to the present invention is mainly characterised by what is stated in the preamble of Claim 1.
  • the use according to the present invention is characterised by what is stated in Claim 15.
  • the copper and nickel slag particles are particularly well suited for the cleaning of steel heat-transfer surfaces, because the nickel and copper slag do not comprise significant amounts of ferrite compounds. This, in turn, means that when cleaning steel surfaces with nickel or copper slag, no corrosion problems appear, which is not the case when blasting with metal slags that comprise ferrite compounds, or when blasting with for example steel particles that also comprise ferrite compounds.
  • heat-transfer surfaces of a power plant in dry conditions, are cleaned using a fine fraction of a waste product generated in a metallurgical process.
  • the surface to be cleaned comprises sulphur or silicate-bearing compounds which are generated when burning wood or fossil fuels or mixtures thereof, and possibly ash, coke or slag which comprise organic compounds (such as tar-like compounds).
  • deposits and similar dirt layers which are generated during the combustion process are removed from the metal surfaces without substantially damaging these.
  • the operation is carried out in essentially "water-free
  • the surface to be cleaned is a heat-transfer surface.
  • the method can also be used to clean other surfaces of a power plant boiler structure, which surfaces comprise impurities, including ash, coke and/or slag deposits which are generated from the combustion.
  • the structure to be cleaned is part of a power boiler, such as a heat boiler, or part of a recovery boiler, such as a kiln for reburning lime sludge or a soda recovery unit.
  • a power boiler such as a heat boiler
  • a recovery boiler such as a kiln for reburning lime sludge or a soda recovery unit.
  • the heat-transfer surface may be a metal surface, typically it is a steel surface.
  • the steel may be, for example, a ferritic or an austenitic steel alloy which meets ASTM standards A213 or A213M, respectively. It is also possible to use other types of metal alloys.
  • the surfaces may be of a material other than metal, for example a ceramic.
  • Examples of surfaces to be cleaned are, in particular, the heat-transfer surface which forms part of a heat boiler, such as the eco- and the superheater packages of grate-fired boilers or fluidised bed boilers.
  • the surface to be cleaned especially a metal surface, typically a steel surface, forms at least part of a superheater or at least part of an Economizer or a Luvo unit.
  • the surface to be cleaned is in the vicinity of the masonry or at least partly on top of it.
  • the distance to the nearest masonry i.e. the masonry surface, is at maximum approximately 250 cm, usually at maximum approximately 150 cm, especially at maximum approximately 100 cm, for example at maximum 50 cm.
  • the masonry surface may be in direct contact with the surface to be cleaned.
  • metal slag means the by-product which is generated in the production or cleaning of the metal in question, i.e. in general "material", which typically is primarily silicate- based.
  • the silicate material is, for example, iron silicate, and it comprises, besides the main component, also for example metals which are derived from the metal raw material, and alkaline earth metals, and their compounds, such as oxides, sulphates, sulphides and silicates.
  • metal slag is used which is essentially free of ferritic compounds.
  • metal slag is used, such as nickel or copper slag, the particles of which are non-spherical shaped.
  • the weight of the slag used comprises at least 90 % iron silicate (Fe 2 Si0 4 ) and 1-5 % magnetite (Fe 3 0 4 ).
  • it may comprise Al, Ca, Mg and Cr-oxides and - silicates (approximately 0.5-5 %), and minor amounts, typically less than 1 %, in particular less than 0.5 % of, for example, one or more of the following metals: Ni, Cu, Pb, Sn, Sb, Bi, and Cd.
  • nickel slag is used. This is a waste product which is generated in association with the recovering of nickel.
  • the material used in the blasting is copper slag (copper grit).
  • the particle material of the metal slag used must have, besides a particle size which is suitable for the blasting, also a sufficient hardness and weight. Typically, the hardness of the metal slag particles must be greater than
  • the hardness can be over 8° on the Mohs scale, but usually a hardness of approximately 8° ( ⁇ 0.5°) is sufficient to carry out the cleaning.
  • the particles must have a suitable shape.
  • the value of the bulk density of the particles is in particular greater than 45 %, for example greater than approximately 50 %, or greater than 60 % of the specific gravity of the particles.
  • the bulk density is greater than 1.8 g/cm 3 , especially 1.85 g/cm 3 or greater.
  • the particle size of the slag is within a pre-selected range.
  • the particle size of the metal slag used (that is, the "grain size”) is approximately 0.3-3 mm. This means that the maximum dimension of at least 80 %, especially at least 90 %, usually at least 95 % of the particles is within the range in question.
  • the present particles may be individual particles or agglomerates (granules) which are formed of several particles.
  • the average particle size of the nickel slag is within the range of 0.3-2.5 mm, for example 0.5-2.2 mm. Typically, this means that the maximum dimension of least 90 % of the particles, most suitably at least approximately 95 % (by weight) is within the said range.
  • typically at least 90 %, especially at least 95 %, (by weight) of the copper slag particles have a particle size within the range of 0.4-2.8 mm, for example 0.425-2.5 mm (largest dimension).
  • the particle size typically means the screened particle size (that is, grain-size).
  • the blast nozzle used can be either small or large.
  • the nozzle diameter may be, for example, 0.5-25 mm, usually approximately 1-15 mm, typically approximately 12 mm. These nozzle sizes are particularly suitable for the application described above, in which the metal slag particles have a narrow distribution of particle size.
  • the blasting is carried out by using a blasting pressure of 8-12 bar. More preferably, the pressure used is 9-11 bar. At this pressure, an efficient cleaning of the dirt layers is achieved and, at the same time, damage to the surface is avoided.
  • the consumption of air varies with the nozzle size, but is generally approximately 50-2500 1/min, most suitably approximately 70-1500 1/min, for example approximately 150-1000 1/min.
  • the blasting can be carried out by using a nozzle which is straight, curved or bent at 45 degrees.
  • the shape of the nozzle is selected according to the object to be cleaned.
  • the surface does not corrode as easily as after treatment in which sand is used.
  • the surface is not prone to become dirty.
  • nickel slag forms a chromium oxide compound on the metal surface, which compound protects the metal from corrosion, and which, on the other hand, also slows down the adhesion of new dirt to the metal surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cleaning In General (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

Cette invention concerne un procédé de nettoyage d'une surface de transfert de chaleur qui est reliée à une structure de maçonnerie d'une chaudière à combustion. Dans ledit procédé, la surface est nettoyée par projection de particules solides sur celle-ci. Selon l'invention, la projection est effectué à une pression de 8 à 12 bars, dans des conditions essentiellement sans eau, au moyen de particules de scories métalliques présentant une taille des particules d'environ 0,3 à 3,0 mm. En particulier, des scories de nickel ou de cuivre sont utilisées, auquel cas, dans des conditions sèches, il est possible d'éliminer la saleté des surfaces métalliques d'objets difficiles à nettoyer, sans endommager la surface. En même temps, il est possible d'éviter les effets nocifs de l'eau qui s'écoule de la surface à nettoyer sur les structures qui sont en contact avec la surface ou à proximité de la surface.
EP16874973.7A 2015-12-18 2016-12-19 Procédé de nettoyage de surfaces de transfert de chaleur d'une salle des machines Active EP3390908B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16874973T PL3390908T3 (pl) 2015-12-18 2016-12-19 Sposób oczyszczania powierzchni wymiany ciepła w elektrowni

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20155970A FI128181B (fi) 2015-12-18 2015-12-18 Menetelmä polttokattilan lämmönsiirtopintojen puhdistamiseksi
PCT/FI2016/050897 WO2017103345A1 (fr) 2015-12-18 2016-12-19 Procédé de nettoyage de surfaces de transfert de chaleur d'une salle des machines

Publications (3)

Publication Number Publication Date
EP3390908A1 true EP3390908A1 (fr) 2018-10-24
EP3390908A4 EP3390908A4 (fr) 2019-06-26
EP3390908B1 EP3390908B1 (fr) 2021-08-18

Family

ID=59055950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16874973.7A Active EP3390908B1 (fr) 2015-12-18 2016-12-19 Procédé de nettoyage de surfaces de transfert de chaleur d'une salle des machines

Country Status (8)

Country Link
EP (1) EP3390908B1 (fr)
BR (1) BR112018012229B1 (fr)
DK (1) DK3390908T3 (fr)
ES (1) ES2898784T3 (fr)
FI (1) FI128181B (fr)
PL (1) PL3390908T3 (fr)
PT (1) PT3390908T (fr)
WO (1) WO2017103345A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20175844A1 (en) 2017-09-22 2019-03-23 Clean Steel Int Oy A method and apparatus for cleaning the inside of a boiler and a boiler comprising such a device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482872A1 (fr) * 1980-05-20 1981-11-27 Gagneraud Francis Production de granules spheroidaux ou billes a partir de matieres minerales en fusion
US4666083A (en) * 1985-11-21 1987-05-19 Fluidyne Corporation Process and apparatus for generating particulate containing fluid jets
WO1994008755A1 (fr) * 1992-10-08 1994-04-28 Julius Stephen Csabai Utilisation d'hematite speculaire comme materiau d'impact
DE19723389A1 (de) * 1997-06-04 1998-12-10 Anton Dipl Ing Thes Verfahren und Strahlgut zur Kesselreinigung
EP2113339A1 (fr) * 2008-04-30 2009-11-04 Omya Development AG Carbone de terre alcaline contenant un minéral pour le nettoyage de surface

Also Published As

Publication number Publication date
DK3390908T3 (da) 2021-11-22
BR112018012229B1 (pt) 2022-08-16
WO2017103345A1 (fr) 2017-06-22
PL3390908T3 (pl) 2022-01-31
FI20155970A (fi) 2017-06-19
BR112018012229A2 (pt) 2018-11-27
PT3390908T (pt) 2021-11-19
EP3390908B1 (fr) 2021-08-18
EP3390908A4 (fr) 2019-06-26
FI128181B (fi) 2019-11-29
ES2898784T3 (es) 2022-03-08

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