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EP0370762B1 - Méthode de nettoyage d'une turbine de génération de puissance installée dans une centrale nucléaire - Google Patents

Méthode de nettoyage d'une turbine de génération de puissance installée dans une centrale nucléaire Download PDF

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Publication number
EP0370762B1
EP0370762B1 EP89312068A EP89312068A EP0370762B1 EP 0370762 B1 EP0370762 B1 EP 0370762B1 EP 89312068 A EP89312068 A EP 89312068A EP 89312068 A EP89312068 A EP 89312068A EP 0370762 B1 EP0370762 B1 EP 0370762B1
Authority
EP
European Patent Office
Prior art keywords
particles
power generation
turbine
nuclear power
generation equipment
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
EP89312068A
Other languages
German (de)
English (en)
Other versions
EP0370762A1 (fr
Inventor
Yoshio Miyasaka
Masao Onizawa
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.)
Sanyo Trading Co Ltd
Fuji Kihan Co Ltd
Original Assignee
Sanyo Trading Co Ltd
Fuji Kihan Co Ltd
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 Sanyo Trading Co Ltd, Fuji Kihan Co Ltd filed Critical Sanyo Trading Co Ltd
Publication of EP0370762A1 publication Critical patent/EP0370762A1/fr
Application granted granted Critical
Publication of EP0370762B1 publication Critical patent/EP0370762B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/002—Cleaning of turbomachines

Definitions

  • This invention relates to a method of cleaning a power generation turbine of a nuclear power generation equipment, particularly a boiling water nuclear power generation equipment.
  • thermal energy generated as a result of nuclear fission is taken out from a reactor core by primary cooling water and converted in a steam plant into element energy.
  • primary cooling water is boiled by heat received from nuclear fuel, it rises along the core to be separated by a steam/water separator provided on core top into steam and water, and separated steam is supplied through a steam pipe to a direct power generation turbine. Consequently, it is necessary to clean the turbine each few years to remove material attached to it. This done to remove contaminants attached to the turbine and also to inspect damage thereto.
  • the cleaning was done by a dry blasting process, in which sintered alumina is used as a polishing agent and blown along with an air stream against the turbine surface.
  • a dry blasting process in which sintered alumina is used as a polishing agent and blown along with an air stream against the turbine surface.
  • FR-A-2 127 021 discloses a method of cleaning parts of a nuclear power generating plant by a blasting process which uses sintered alumina. This method therefore suffers from the disadvantage mentioned above.
  • GB-A-1 571 239 discloses the use of resin coated particles in a blasting technique but these particles are sand or slag which increase the indentation depth of a surface which is blasted and hence would cause wear.
  • An object of the invention is to provide a method of removing material attached to a power generation turbine of a nuclear power generation equipment, particularly of the boiling water type, without causing wear of the turbine surface, and without causing a problem of disposal after treatment.
  • a method of removing and disposing of material attached to the surface of a turbine including the step of blowing particles in a gas stream against the turbine surface, characterised in that:
  • a thermosetting resin is used, which is suitably a melamine resin.
  • the melamine resin may be of a single composition, or it may be a mixture of a melamine resin with a different thermosetting resin.
  • the melamine resin may slightly contain a urea resin When the content of a urea resin is high, however, the capacity of the particles to remove material is reduced, and also the ratio of breakage of particles at the time of removal of attached material is increased, thus increasing the amount of particles used.
  • the content of a urea resin in the particles is suitably no greater than 30% by weight.
  • the grain size of melamine resin particles is not particularly limited, but is suitably 20 to 120 meshes as prescribed by JIS R-6001-1973.
  • the particles may have any shape. Their hardness is not particularly limited, but is suitably 3 to 4 in Mohs scale.
  • the particles may be obtained by pulverizing solidified meramine resin masses, pellets, etc. with a pulverizer.
  • the particles may be blasted along with a gas stream by various blasting processes, but the dry blasting processes are best suited. Among the dry blasting processes are
  • compressed gas usually compressed air is used.
  • its pressure is set to 3 to 10 kg/cm2 in gauge pressure, and the speed of jet of compressed gas from the nozzle is 50 to 240 m/sec.
  • the amount of particles used for cleaning, pressure of compressed gas and speed of jet can be suitably selected in dependence on the characteristics of particles used and state of attachment of material to the turbine.
  • Particles after use for removal of attached material contain the removed material such that the particles and removed material form a non-homogeneous mixture.
  • a residue of melamine resin after incineration remains with the removed material as overall residue of incineration.
  • the exhaust gas discharged from the incinerator is discharged into atmosphere through a suitable discharge gas treatment equipment such as a filter.
  • the residue of melamine resin particles is several per cent at most of the quantity of resin particles before incineration.
  • the incinerator may be of various types, and it is suitable to use an electric furnace.
  • the residue of incineration containing attached material can be treated by a suitable process such as holding in a concrete.
  • thermosetting resin When particles comprising a thermoplastic resin are used, incineration of particles after use for cleaning in the incinerator causes melting of the thermoplastic resin in the incinerator and adhering the melted resin to the bottom of the incinerator. This means that the treatment of the residue after incineration is very difficult. Therefore, it is indispensable to use particles comprising a thermosetting resin.
  • the method according to the invention is applicable to a nuclear power generation equipment, particularly to a boiling water type nuclear power generation equipment.
  • the drawing is a schematic view showing a blast apparatus suited for carrying out the invention.
  • melamine resin particles with a grain size of 42 to 90 meshes material precipitated and attached to the surface of a power generation turbine of a boiling water type nuclear power generation equipment was removed. The removal was carried out using direct pressure type blaster 20. Particles 10 were charged into tank 22, and compressed air was forced from a compressed air source into tank 22 and transport pipe 26. The rate of supply of compressed air from the compressed air source was set to 1 Nm3/min., and the pressure to 5 kg/cm2 in gauge pressure. The rate of use of particles was 300 kg/hour. Particles discharged from a discharge port provided at the bottom of tank 22 were transported by compressed air along the transport pipe and discharged from nozzle 24.
  • the nozzle inner diameter was 5 mm
  • the speed of jet of compressed air from the nozzle was set to 150 m/sec.
  • the distance from the nozzle to the turbine surface was held at 200 to 800 mm.
  • Particles from the nozzle were blown against the turbine surface to remove material attached to the turbine surface.
  • the rate blowing with particles per 1 m2 of turbine surface was set to 40 to 60 kg. No wear was recognized on the turbine surface after removal of attached material. Neither material remaining attached to the turbine surface nor particles attached thereto were recognized.
  • Combustion residue of particles used for the removal was only about 2 % by weight of the particles before the combustion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning In General (AREA)

Claims (3)

  1. Procédé d'élimination et de décharge de la matière adhérant à la surface d'une turbine, ce procédé consistant à souffler des particules dans un courant de gaz contre la surface de la turbine, caractérisé en ce que:
    a) lesdites particules sont constituées de résine mélamine thermodurcissable ou d'un mélange d'une résine mélamine avec une résine thermodurcissable différente et sont soufflées contre la turbine d'un générateur d'énergie nucléaire pour éliminer la matière contaminée,
    b) une fois que les particules ont été utilisées pour éliminer ladite matière contaminée, lesdites particules et ladite matière sont incinérées conjointement dans un four, le gaz d'échappement de l'incinération étant déchargé dans l'atmosphère par l'intermédiaire d'un équipement de traitement de gaz, et
    c) le résidu de l'incinération est stocké dans du béton.
  2. Procédé selon la revendication 1, dans lequel le calibre desdites particules se situe dans la gamme de 20 à 120 mesh.
  3. Procédé selon la revendication 1 ou 2, dans lequel l'équipement générateur d'énergie nucléaire est un équipement générateur d'énergie nucléaire du type à eau bouillante.
EP89312068A 1988-11-22 1989-11-21 Méthode de nettoyage d'une turbine de génération de puissance installée dans une centrale nucléaire Expired - Lifetime EP0370762B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP293474/88 1988-11-22
JP63293474A JPH0761612B2 (ja) 1988-11-22 1988-11-22 沸騰水型原子力発電設備の発電用タービンの洗浄方法

Publications (2)

Publication Number Publication Date
EP0370762A1 EP0370762A1 (fr) 1990-05-30
EP0370762B1 true EP0370762B1 (fr) 1993-04-07

Family

ID=17795213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89312068A Expired - Lifetime EP0370762B1 (fr) 1988-11-22 1989-11-21 Méthode de nettoyage d'une turbine de génération de puissance installée dans une centrale nucléaire

Country Status (3)

Country Link
EP (1) EP0370762B1 (fr)
JP (1) JPH0761612B2 (fr)
DE (1) DE68905907T2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0451383A1 (fr) * 1990-04-10 1991-10-16 Sanyo Trading Co., Ltd. Procédé de nettoyage de moules
JP2007309831A (ja) * 2006-05-19 2007-11-29 Ihi Corp 廃ブラスト材の処理方法
JP5723942B2 (ja) * 2013-09-18 2015-05-27 株式会社不二機販 粉末状金属材料の表面処理方法
DE102015209994A1 (de) * 2015-05-29 2016-12-15 Lufthansa Technik Ag Verfahren und Vorrichtung zur Reinigung eines Strahltriebwerks
CN106194282B (zh) * 2016-08-30 2017-10-13 安徽金禾实业股份有限公司 一种三聚氰胺尿洗塔蒸汽回收发电方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57198916A (en) * 1981-06-01 1982-12-06 Nippon Atom Ind Group Co Ltd Incinerating and volume decreasing equipment for waste sludge

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1173263A (en) * 1968-04-30 1969-12-03 Chrysler Corp Method of Cleaning a Gas Turbine Engine
DE2107479C3 (de) * 1971-02-17 1974-01-03 Siemens Ag, 1000 Berlin U. 8000 Muenchen Verfahren zur Dekontaminierung der Oberflächen von Kernreaktorbauteilen
GB1571239A (en) * 1977-08-18 1980-07-09 Nojimagumi Co Ltd Abrasive materials and a method of producing such materials
JPS60237400A (ja) * 1983-12-24 1985-11-26 大同特殊鋼株式会社 除染方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57198916A (en) * 1981-06-01 1982-12-06 Nippon Atom Ind Group Co Ltd Incinerating and volume decreasing equipment for waste sludge

Also Published As

Publication number Publication date
JPH0761612B2 (ja) 1995-07-05
DE68905907T2 (de) 1993-11-11
JPH02145259A (ja) 1990-06-04
EP0370762A1 (fr) 1990-05-30
DE68905907D1 (de) 1993-05-13

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