WO2013122277A1 - 슬러지 저감 증기발생기 및 슬러지 저감 증기발생기 관판 제작방법 - Google Patents

슬러지 저감 증기발생기 및 슬러지 저감 증기발생기 관판 제작방법 Download PDF

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Publication number
WO2013122277A1
WO2013122277A1 PCT/KR2012/001332 KR2012001332W WO2013122277A1 WO 2013122277 A1 WO2013122277 A1 WO 2013122277A1 KR 2012001332 W KR2012001332 W KR 2012001332W WO 2013122277 A1 WO2013122277 A1 WO 2013122277A1
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WIPO (PCT)
Prior art keywords
steam generator
sludge
ceramic
heat transfer
tube
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PCT/KR2012/001332
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English (en)
French (fr)
Inventor
김한상
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한국수력원자력 주식회사
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Application filed by 한국수력원자력 주식회사 filed Critical 한국수력원자력 주식회사
Priority to JP2014557550A priority Critical patent/JP6162155B2/ja
Priority to EP12868602.9A priority patent/EP2816565B1/en
Priority to US14/378,932 priority patent/US20150362175A1/en
Priority to CN201280069885.XA priority patent/CN104137186B/zh
Publication of WO2013122277A1 publication Critical patent/WO2013122277A1/ko

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    • 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
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/107—Protection of water tubes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F14/00—Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes
    • C23F14/02—Inhibiting incrustation in apparatus for heating liquids for physical or chemical purposes by chemical means
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K5/00—Plants characterised by use of means for storing steam in an alkali to increase steam pressure, e.g. of Honigmann or Koenemann type
    • F01K5/02—Plants characterised by use of means for storing steam in an alkali to increase steam pressure, e.g. of Honigmann or Koenemann type used in regenerative installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/023—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes, for nuclear reactors as far as they are not classified, according to a specified heating fluid, in another group
    • F22B1/025—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes, for nuclear reactors as far as they are not classified, according to a specified heating fluid, in another group with vertical U shaped tubes carried on a horizontal tube sheet
    • 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
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/205—Supporting and spacing arrangements for tubes of a tube bundle
    • 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
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators
    • 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
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/54—De-sludging or blow-down devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/16—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants comprising means for separating liquid and steam
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/004—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using protective electric currents, voltages, cathodes, anodes, electric short-circuits
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the present invention relates to a sludge reduction steam generator and a sludge reduction steam generator tube plate manufacturing method for effectively removing sludge deposits in a steam generator of a pressurized water reactor according to the present invention.
  • Pressurized water reactor nuclear power plant transfers heat generated from nuclear fuel to steam generator to heat feed water supplied from secondary side and converts it into steam, and uses steam to produce electricity by performing mechanical work in turbine.
  • This iron corrosion product is hematite (Fe2O3) and magnetite (Fe3O4) of 95.8% and other metal oxides, this iron corrosion product promotes the corrosion of the steam generator tube.
  • the iron corrosion product deposited on the heat transfer pipe support plate (tube plate) causes the oscillation of the water level of the steam generator by obstructing the flow path of the cooling water, and thus causes the output reduction operation or uninterruption of the nuclear power plant.
  • the present invention is to solve the above-mentioned problems of the prior art, the sludge reduction steam generator and sludge reduction steam to significantly improve the efficiency of removing the steam product corrosion product of the steam generator by preventing the iron corrosion products deposited on the tube plate.
  • An object of the present invention is to provide a method for producing a generator tube sheet.
  • the heat transfer pipe (2) is installed in a plurality of U-shaped so that the heat exchange heating water flows inside the pressure vessel; and the heat transfer pipe (2) is coupled through At least one tube plate (3) for supporting the heat transfer tube (2), wherein the tube plate (3) is a coating layer coated with a ceramic of the same material within a certain range of iron corrosion products and surface electrical polarity (zeta-porous) It is characterized by including 30.
  • the heat transfer pipe (2) is installed in a plurality of U-shaped so that the heat-exchanging heating water flows inside the pressure vessel; the production of the tube plate (3) for supporting
  • the coating process of forming a coating layer 30 by coating with a ceramic of the same material within a certain range of iron corrosion product and surface electrical polarity (zeta potential) on the surface of the tube plate 3 is completed; Characterized in that it comprises.
  • the coating process is characterized in that the coating on the surface of the tube plate 3 supporting the heat transfer tube 2 of the steam generator 1 by chemical vapor deposition (CVD) or plasma deposition.
  • CVD chemical vapor deposition
  • plasma deposition the coating on the surface of the tube plate 3 supporting the heat transfer tube 2 of the steam generator 1 by chemical vapor deposition (CVD) or plasma deposition.
  • the ceramic is characterized in that any one of titanium ceramic (TiO 2) or zirconium ceramic (ZrO 2).
  • the titanium ceramic (TiO 2) or zirconium ceramic (ZrO 2) coating layer 30 coated on the upper heat transfer tube support plate (tube plate) of the steam generator is composed of Fe 2 O 3 and Fe 3 O 4, which are the main components of the steam generator secondary sludge. It provides an effect of preventing deposition and increasing the surface inductance so that it can be easily removed by the steam generator blowdown system.
  • the present invention is effective in the removal of the steam generator sludge to reduce the clogging of the steam generator flow path, reducing the fouling phenomenon of the steam generator heat pipe, thereby providing an effect of increasing the thermal efficiency.
  • the present invention also provides the effect of reducing heat pipe damage in the heat pipe support plate (tube plate) by sludge.
  • the present invention provides an effect of increasing the life of the steam generator tube by preventing the corrosion of the steam generator tube and the tube sheet.
  • FIG. 1 is a cross-sectional view of a steam generator 1 according to an embodiment of the present invention
  • FIG. 2 is a plan view of the heat transfer tube support plate (tube plate) 3 cut along the line I-I of FIG.
  • FIG. 3 is a schematic cross-sectional view of the tube plate 3 showing the ceramic coating layer 30.
  • FIG. 1 is a cross-sectional view of a steam generator 1 according to an embodiment of the present invention
  • Figure 2 is a plan view of the heat transfer tube support plate (tube plate) 3 cut along the line II of Figure 1
  • Figure 3 is a ceramic coating layer
  • 30 is a schematic cross-sectional view of the tube plate 3 showing (30).
  • the steam generator 1 is a heat transfer tube (2) is installed in a plurality of U-shaped so that the heat exchange heating water flows inside the pressure vessel; and the heat transfer tube (2) is coupled through the At least one tube plate (3) for supporting the heat transfer tube (2), including, the tube plate 3 is made of a ceramic of the same material in the iron corrosion product and the surface electrical polarity (zeta potential) within a certain range as shown in FIG. A coated coating layer 30 is provided.
  • the pressure vessel is moved through a plurality of inlets (4) and the heat transfer pipe (2) into which the heated water flows and removes the plurality of outlets (5) and sediments (6) from which the cooled water is discharged after heat exchange.
  • a plurality of outlets 7 are formed for this purpose.
  • the ceramic may be either titanium ceramic (TiO 2) or zirconium ceramic (ZrO 2).
  • the ceramic coating layer 30 is a material in which TiO 2 or ZrO 2 is present in a stable state in a steam generator secondary environment at a high temperature and a high pH environment.
  • the heat transfer tube 2 of the steam generator 1 may be formed by chemical vapor deposition (CVD) or plasma deposition. ) Is coated on the surface of the tube plate (3) to support the ceramic plate layer (30).
  • the secondary side of the steam generator 1 is operated in high temperature, high pressure and high pH environment. Therefore, the operating range of the electrochemical potential (ECP) varies from positive tens of mV to negative 500mV.
  • ECP electrochemical potential
  • the zeta potential of Fe 2 O 3 and Fe 3 O 4 at the operating temperature and pH of the general steam generator 1 is about -4 mV, and at the same temperature / pH, TiO 2 or ZrO 2 has similar potentials with the same configuration.
  • the ceramic coating layer 30 of the above configuration is a material that can withstand the ECP fluctuation range and temperature change in the steam generator 1 for a long time, and has the same polarity as the magnetite in which the zeta potential exists in a colloidal state in the system water. .
  • the ceramic coating layer 30 composed of TiO 2 or ZrO 2 causes the precipitate containing Fe 2 O 3 and Fe 3 O 4 and electrical repulsion, thereby reducing the frictional force with the surface of the coating layer 30, thereby increasing the surface fluidity of the deposit which is a foreign substance of iron. It is induced to be easily removed through the outlet 7 of the steam generator (1). Accordingly, the removal efficiency of the corrosion products of the steam generator extraction system is also significantly improved.

Abstract

본 발명의 가압경수로의 증기발생기 내부에서 슬러지의 침전물을 효과적으로 제거할 수 있도록 하는 슬러지 저감 증기발생기 및 슬러지 저감 증기발생기 관판 제작방법에 관한 것으로, 상기 슬러지 저감 증기발생기는, 압력용기의 내부에 열교환 가열수가 흐르도록 U자형으로 다수가 설치되는 전열관(2);과, 상기 전열관(2)이 관통하여 결합되어 상기 전열관(2)을 지지하는 하나 이상의 관판(3);을 포함하며, 상기 관판(3)은 철 부식생성물과 표면전기적 극성(제타포펜셜)이 일정 범위 내에서 동일한 재질의 세라믹으로 코팅된 코팅층(30)을 구비하여, 침전물과 전기적 반발력을 유발시켜 침전물을 관판면으로부터 반발시키는 것에 의해 침전물의 관판면에의 침적 부착을 방지하고, 표면 마찰력을 감소시켜 이 관판면에 침전된 침전물의 제거를 용이하게 하는 효과를 제공한다.

Description

슬러지 저감 증기발생기 및 슬러지 저감 증기발생기 관판 제작방법
본 발명의 가압경수로의 증기발생기 내부에서 슬러지의 침전물을 효과적으로 제거할 수 있도록 하는 슬러지 저감 증기발생기 및 슬러지 저감 증기발생기 관판 제작방법에 관한 것이다.
가압경수로 원자력발전소는 핵연료에서 발생된 열을 증기발생기에 전달하여 2차측에서 공급된 급수를 가열하여 증기로 변환하고, 이 증기를 이용하여 터빈에서 기계적 일을 수행하여 전기를 생산한다.
증기발생기 2차측에서는 계통구조물의 부식생성물을 함유하는 대유량의 급수가 상변화를 일으켜 증기로 변환되는데, 이때 유량의 속도가 낮아져 급수에 포함된 철 부식생성물이 증기발생기 2차측 하부에 침전된다.
이 철 부식 생성물은 헤마타이트(Fe2O3)와 마그네타이트(Fe3O4)가 95.8%이고 이외 기타 금속산화물로 이루어지는데, 이러한 철 부식 생성물에 의해 증기 발생기 전열관의 부식이 촉진된다. 특히 전열관 지지판(관판)에 침적된 철 부식생성물은 냉각수의 유로를 방해하여 증기발생기의 수위의 급변동(Oscillation)을 유발하고, 이에 따라 원전의 출력 감소 운전이나 불시정지의 원인이 된다.
이러한 침전물인 철 부식 생성물은 매년 수백 kg이 증기발생기 하부에 침적된다. 이에 따라 증기발생기 하부에 침적된 부식생성물을 제거하기 위하여 증기발생기 취출수계통(Blow-down System)을 운영하여 매계획예방정비 시 제거 작업을 수행하여 제거하고 있으나, 철 산화물이 증기 발생기 바닥에 고착되는 성질이 있어 취출수계통으로 제거가 용이하지 않은 문제점을 가진다.
또한, 최근에는 분산제라는 약품을 써서 철 부식생성물이 증기발생기 하부에 침적되는 것을 줄이는 방안이 효과적으로 적용되고 있으나, 분산제를 사용하는데 고비용이 수반되고 수질오염의 부작용이 수반되는 문제점이 발생한다.
따라서, 본 발명은 상술한 종래기술의 문제점을 해결하기 위한 것으로서, 철 부식 생성물이 관판에 침적 부착되지 않도록 함으로써 증기발생기의 취출수계통 부식생성물 제거효율을 현저히 향상시키는 슬러지 저감 증기발생기 및 슬러지 저감 증기발생기 관판 제작방법을 제공하는 것을 목적으로 한다.
상술한 목적을 달성하기 위한 본 발명의 슬러지 저감 증기발생기는, 압력용기의 내부에 열교환 가열수가 흐르도록 U자형으로 다수가 설치되는 전열관(2);과, 상기 전열관(2)이 관통하여 결합되어 상기 전열관(2)을 지지하는 하나 이상의 관판(3);을 포함하며, 상기 관판(3)은 철 부식생성물과 표면전기적 극성(제타포펜셜)이 일정 범위 내에서 동일한 재질의 세라믹으로 코팅된 코팅층(30)을 구비하는 것을 특징으로 한다.
상술한 목적을 달성하기 위한 본 발명의 슬러지 저감 증기발생기 관판 제작방법은, 압력용기의 내부에 열교환 가열수가 흐르도록 U자형으로 다수가 설치되는 전열관(2);을 지지하는 관판(3)의 제작방법에 있어서, 성형이 완료된 상기 관판(3)의 표면에 철 부식생성물과 표면전기적 극성(제타포펜셜)이 일정 범위 내에서 동일한 재질의 세라믹으로 코팅하여 코팅층(30)을 형성하는 코팅과정;을 포함하여 이루어지는 것을 특징으로 한다.
상기 코팅과정은, 화학기상증착법(CVD)이나 플라즈마 증착법에 의해 증기발생기(1)의 전열관(2)을 지지하는 관판(3) 면에 코팅되는 것을 특징으로 한다.
상기 세라믹은 티타늄세라믹(TiO2)이나 지르코니움세라믹(ZrO2) 중 어느 하나인 것을 특징으로 한다.
상술한 구성을 가지는 본 발명은 증기발생기 하부 전열관지지판(관판) 상부에 코팅된 티타늄세라믹(TiO2)이나 지르코니움세라믹(ZrO2) 코팅층(30)이 증기발생기 2차측 슬러지의 주성분인 Fe2O3와 Fe3O4의 침적을 막고, 표면 유도성을 증가시켜 증기발생기 취출수계통(Blowdown)으로 용이하게 제거시킬 수 있도록 하는 효과를 제공한다.
또한, 본 발명은 증기발생기 슬러지의 효과적인 제거로 증기발생기 유로막힘 현상이 감소되고, 증기발생기 전열관의 파울링 현상을 감소시키며, 이로 인해 열효율을 증가시키는 효과를 제공한다.
또한, 본 발명은 슬러지에 의한 전열관지지판(관판)에서의 전열관 손상을 감소시키는 효과를 제공한다.
또한, 본 발명은 증기발생기 튜브와 튜브시트의 틈새부식을 방지하여 증기발생기 전열관의 수명을 증가시키는 효과를 제공한다.
도 1은 본 발명의 실시예에 따른 증기발생기(1)의 단면도,
도 2는 도 1의 I-I선을 따라 절단하여 바라본 전열관지지판(관판)(3)의 평면도,
도 3은 세라믹 코팅층(30)을 나타내는 관판(3)의 개략적인 단면도이다.
이하, 첨부 도면을 참조하여 본 발명의 더욱 상세히 설명한다.
도 1은 본 발명의 실시예에 따른 증기발생기(1)의 단면도이고, 도 2는 도 1의 I-I선을 따라 절단하여 바라본 전열관지지판(관판)(3)의 평면도이고, 도 3은 세라믹 코팅층(30)을 나타내는 관판(3)의 개략적인 단면도이다.
도 1 및 도 2와 같이, 상기 증기발생기(1)는 압력용기의 내부에 열교환 가열수가 흐르도록 U자형으로 다수가 설치되는 전열관(2);과, 상기 전열관(2)이 관통하여 결합되어 상기 전열관(2)을 지지하는 하나 이상의 관판(3);을 포함하며, 상기 관판(3)은 도 3과 같이 철 부식생성물과 표면전기적 극성(제타포펜셜)이 일정 범위 내에서 동일한 재질의 세라믹으로 코팅된 코팅층(30)을 구비한다.
상기 압력용기에는 가열된 물이 유입되는 다수의 주입구(4)와 전열관(2)을 통해 이동하며 열교환을 수행한 후 냉각된 물이 배출되는 다수의 배출구(5) 및 침전물(6)의 제거를 위한 다수의 취출구(7)가 형성된다.
상기 세라믹은 티타늄세라믹(TiO2)이나 지르코니움세라믹(ZrO2) 중 어느 하나일 수 있다.
상기 세라믹 코팅층(30)은 TiO2나 ZrO2를 증기발생기 2차측 환경이 고온, 고 pH 환경에서 안정상으로 존재하는 물질로 화학기상증착법(CVD)이나 플라즈마 증착법에 의해 증기발생기(1)의 전열관(2)을 지지하는 관판(3) 면에 코팅되어 세라믹 코팅층(30)으로 형성된다.
증기발생기(1)의 2차측은 고온과 고압 및 고pH 환경에서 운전된다. 따라서 전기화확적 부식전위(ECP, Electrochemical Potential)의 운전범위가 (+) 수십 mV에서부터 (-) 500mV까지 다양하게 변화하게 된다. 일반적인 증기발생기(1)의 운전온도 및 pH에서 Fe2O3와 Fe3O4의 제타포텐셜은 약 -4mV이고 동 온도/pH 조건에서 TiO2나 ZrO2도 동일한 구성과 유사한 포텐셜을 갖는다.
상기 구성의 세라믹 코팅층(30)은 이러한 증기발생기(1) 내부의 ECP 변동 범위와 온도변화에 장시간 견딜 수 있는 재질이며, 제타포텐셜이 계통 수 내에서 콜로이드 상태로 존재하는 마그네타이트와 같은 극성을 갖게 된다.
이에 따라 TiO2나 ZrO2로 구성된 세라믹 코팅층(30)이 Fe2O3와 Fe3O4를 포함하는 침전물과 전기적 반발력을 유발하게 되어 코팅층(30)의 표면과의 마찰력이 감소되어 철성분 이물질인 침전물의 표면 유동도를 증가시켜 증기발생기(1)의 취출구(7)를 통해 용이하게 제거되도록 유도된다. 이에 따라 증기발생기 취출계통의 부식생성물 제거 효율 또한 현저히 향상된다.

Claims (5)

  1. 압력용기의 내부에 열교환 가열수가 흐르도록 U자형으로 다수가 설치되는 전열관(2);과, 상기 전열관(2)이 관통하여 결합되어 상기 전열관(2)을 지지하는 하나 이상의 관판(3);을 포함하며,
    상기 관판(3)은 철 부식생성물과 표면전기적 극성(제타포펜셜)이 일정 범위 내에서 동일한 재질의 세라믹으로 코팅된 코팅층(30)을 구비하는 것을 특징으로 하는 슬러지 저감 증기발생기.
  2. 청구항 1에 있어서,
    상기 세라믹은 티타늄세라믹(TiO2)이나 지르코니움세라믹(ZrO2) 중 어느 하나인 것을 특징으로 슬러지 저감 증기발생기.
  3. 압력용기의 내부에 열교환 가열수가 흐르도록 U자형으로 다수가 설치되는 전열관(2);을 지지하는 관판(3)의 제작방법에 있어서,
    성형이 완료된 상기 관판(3)의 표면에 철 부식생성물과 표면전기적 극성(제타포펜셜)이 일정 범위 내에서 동일한 재질의 세라믹으로 코팅하여 코팅층(30)을 형성하는 코팅과정;을 포함하여 이루어지는 것을 특징으로 하는 슬러지 저감 증기발생기 관판 제작 방법.
  4. 청구항 3에 있어서, 상기 코팅과정은,
    화학기상증착법(CVD)이나 플라즈마 증착법에 의해 증기발생기(1)의 전열관(2)을 지지하는 관판(3) 면에 코팅되는 것을 특징으로 하는 슬러지 저감 증기발생기 관판 제작 방법.
  5. 청구항 3에 있어서, 상기 세라믹은,
    티타늄세라믹(TiO2)이나 지르코니움세라믹(ZrO2) 중 어느 하나인 것을 특징으로 하는 슬러지 저감 증기발생기 관판 제작 방법.
PCT/KR2012/001332 2012-02-15 2012-02-22 슬러지 저감 증기발생기 및 슬러지 저감 증기발생기 관판 제작방법 WO2013122277A1 (ko)

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