KR102650367B1 - Power plant steam temperature control valve that can maintain longevity by providing durability - Google Patents
Power plant steam temperature control valve that can maintain longevity by providing durability Download PDFInfo
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- KR102650367B1 KR102650367B1 KR1020230166722A KR20230166722A KR102650367B1 KR 102650367 B1 KR102650367 B1 KR 102650367B1 KR 1020230166722 A KR1020230166722 A KR 1020230166722A KR 20230166722 A KR20230166722 A KR 20230166722A KR 102650367 B1 KR102650367 B1 KR 102650367B1
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- temperature control
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- 239000002131 composite material Substances 0.000 claims abstract description 31
- 238000003466 welding Methods 0.000 claims abstract description 21
- 150000004767 nitrides Chemical class 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 229910001347 Stellite Inorganic materials 0.000 claims abstract description 8
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 229910000531 Co alloy Inorganic materials 0.000 claims abstract description 5
- 239000011651 chromium Substances 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 15
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 abstract description 14
- 239000010410 layer Substances 0.000 description 64
- 239000011247 coating layer Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 150000001868 cobalt Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/005—Particular materials for seats or closure elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0641—Nitrides
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- 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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
- F16K5/045—Particular coverings and materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
- F16K5/0457—Packings
- F16K5/0478—Packings on the plug
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Lift Valve (AREA)
Abstract
본 발명은 발전소 증기 온도조절밸브에 관한 것으로, 그 목적은, 5단 내지 8단의 유로 구성을 갖는 발전소 증기 온도 조절밸브의 밸브 트림의 밀봉부에 5개층 이상으로 이루어진 PVD 복합층을 형성하고, PVD 복합층의 위에 크롬나이트(CrN)층을 포함하도록 하여 고온 및 고압력의 알카리수 환경에 대해 밸브 수명을 연장시킬 수 있도록 하는 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브를 제공함에 있다. 이는 유체가 흐르는 통로를 개방하거나 폐쇄함으로써 유체의 흐름을 제어하되, 5단 내지 8단의 유로 구성을 가지는 플러그와, 상기 플러그가 접촉되어지는 시트링를 포함하는 발전소 증기 온도조절밸브에 있어서, 상기 플러그와 시트링이 접촉되어 형성되는 각각의 밀봉부는, 모재의 표면에 코발트 계열 합금 용접봉인 스텔라이트(Stellite)를 이용하여 표면경화용접을 실시하여 형성된 경화용접층과, 상기 경화용접층의 위에 형성된 질화층과, 상기 질화층 위에 형성하되, 복합성분으로 5개층 이상으로 이루어진 PVD 복합층과, 상기 PVD 복합층 위에 형성된 크롬나이트(CrN)층을 포함하는 것이다.The present invention relates to a power plant steam temperature control valve, and its purpose is to form a PVD composite layer consisting of five or more layers in the sealing part of the valve trim of a power plant steam temperature control valve having a 5-stage to 8-stage flow path configuration, By including a chromite (CrN) layer on the PVD composite layer, we provide a power plant steam temperature control valve that can maintain a long service life by providing durability to extend the life of the valve in a high temperature and high pressure alkaline water environment. This is a power plant steam temperature control valve that controls the flow of fluid by opening or closing the passage through which the fluid flows, and includes a plug having a 5-stage to 8-stage flow path configuration and a seat ring with which the plug is in contact, wherein the plug Each sealing portion formed by contacting the seat ring includes a hardened weld layer formed by surface hardening welding on the surface of the base material using Stellite, a cobalt-based alloy welding rod, and a nitride layer formed on the hardened weld layer. It includes a layer, a PVD composite layer formed on the nitride layer and composed of five or more layers of composite components, and a chromium nitride (CrN) layer formed on the PVD composite layer.
Description
본 발명은 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브에 관한 것으로, 더욱 상세하게는, 5단 내지 8단의 유로 구성을 갖는 발전소 증기 온도 조절밸브의 밸브 트림의 밀봉부에 5개층 이상으로 이루어진 PVD 복합층을 형성하고, PVD 복합층의 위에 크롬나이트(CrN)층을 포함하도록 하여 고온 및 고압력의 알카리수 환경에 대해 밸브 수명을 연장시킬 수 있도록 하는 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브에 관한 것이다.The present invention relates to a power plant steam temperature control valve capable of maintaining a long life by providing durability, and more specifically, to a power plant steam temperature control valve having a 5-stage to 8-stage flow path configuration, which has five or more layers in the sealing part of the valve trim. Power plant steam that can maintain a long service life by forming a PVD composite layer composed of and including a chromite (CrN) layer on top of the PVD composite layer to provide durability to extend the life of the valve in an alkaline water environment of high temperature and high pressure. It's about the temperature control valve.
일반적으로 증기 온도조절 밸브(Steam Temperature Control Valve)는, 밸브 출구 측의 증기 온도를 일정하게 유지하는 목적으로 사용되고, 특히, 발전소에 적용되는 증기 온도조절 밸브는 고압의 급수를 이용하여 분무(Spray)하게 된다.In general, the Steam Temperature Control Valve is used to maintain a constant steam temperature on the valve outlet side, and in particular, the steam temperature control valve applied to power plants uses high-pressure water to spray. I do it.
발전소 계통 중 고, 차압 증기 온도 조절밸브는, 터빈 바이패스(Turbine By-Pass)계통에 설치되어 발전소 저부하운전(Base Load Operation), 기동(Start), 정지(Stop) 등에 사용이 되며, 작동 횟수도 증가 되고 있고, 터빈 바이패스 계통 후단온도를 제어하기 위해 사용된다. The high and differential pressure steam temperature control valve in the power plant system is installed in the turbine by-pass system and is used for base load operation, start, and stop of the power plant. The number of times is increasing, and it is used to control the temperature at the downstream of the turbine bypass system.
또한, 증기 온도조절 밸브에 사용되는 급수는 보일러 급수펌프(Boiler Feed Pump)에서 공급되며 발전출력 500MW 기준 주급수 펌프에서 공급되는 압력은 309kg/㎠ 로 이때 급수온도는 170.8℃이며, 고순도의 급수 수질 조건에서 pH 8.5 ~ 9.0유지 된다.In addition, the feed water used in the steam temperature control valve is supplied from the boiler feed pump. Based on the power generation output of 500 MW, the pressure supplied from the main feed water pump is 309 kg/㎠, and the feed water temperature at this time is 170.8 ℃, and the water quality is high purity. Under these conditions, pH is maintained at 8.5 to 9.0.
또한, 온도조절 밸브에 공급되는 급수의 압력 조건은 입구측 309kg/㎠로 유입되여 밸브트림(Trim) 구조를 통하여 출구 압력은 45kg/㎠ ~160kg/㎠로 입,출구의 차압이 264kg/㎠~149kg/㎠에 달하는 고차압 운전이 요구 된다. 이때 최대 유속은 44m/sec에 도달한다.In addition, the pressure condition of the water supplied to the temperature control valve is 309kg/㎠ on the inlet side, and through the valve trim structure, the outlet pressure is 45kg/㎠ ~160kg/㎠, and the differential pressure between the inlet and outlet is 264kg/㎠~. High differential pressure operation of up to 149kg/㎠ is required. At this time, the maximum flow speed reaches 44m/sec.
즉, 증기 온도조절 밸브의 수질 조건이 온도와 압력를 가진 알카리수로 고차압에 의한 금속 부식에 영향을 미치는 것은 물론, 유량 제어와 차단을 하는 밀봉면(Plug & Seat)의 마모가 국부적으로 발생되고, 밀봉부의 마모가 심화되어 누설로 이어지면 계통 후단 온도 조절이 불가한 경우가 발생된다.In other words, the water quality conditions of the steam temperature control valve are alkaline water with temperature and pressure, which not only affects metal corrosion due to high differential pressure, but also causes local wear of the sealing surfaces (Plug & Seat) that control and block the flow rate, If the wear of the seal worsens and leads to leakage, temperature control at the downstream end of the system becomes impossible.
한편, 발전소에 적용되는 밸브트림에 내구성을 향상시키도록 하는 선행기술이 본 출원인의 선등록된 등록특허 10-2100280호의 "발전소 가혹조건에서 밸브트림의 기밀 내구성 향상을 위한 제조방법 및 이를 적용한 밸브트림"에 개시되어 있다.Meanwhile, prior art to improve the durability of valve trims applied to power plants is the applicant's pre-registered patent No. 10-2100280, titled “Manufacturing method for improving airtight durability of valve trims in harsh power plant conditions and valve trims using the same.” "It is disclosed in
선행특허를 살펴보면, 유체가 흐르는 통로를 개방하거나 폐쇄함으로써 유체의 흐름을 제어하는 플러그와, 상기 플러그가 접촉되어지는 시트링를 포함하며, 상기 플러그와 시트링이 접촉되어 형성되는 각각의 밀봉부는, 모재의 표면에 코발트 계열 합금 용접봉인 스텔라이트(Stellite)를 이용하여 표면경화용접을 실시하여 형성된 경화용접층과, 상기 경화용접층의 위에 형성된 질화층과, 상기 질화층의 위에 형 PVD 코팅층으로 구성되어진 것이다.Looking at the prior patent, it includes a plug that controls the flow of fluid by opening or closing a passage through which the fluid flows, and a seat ring with which the plug comes into contact, and each sealing portion formed by contacting the plug and the seat ring includes a base material. It consists of a hardened weld layer formed by surface hardening welding using Stellite, a cobalt-based alloy welding rod, a nitride layer formed on the hardened weld layer, and a PVD coating layer on the nitride layer. will be.
그러나, 종래의 밸브트림은, 고경도 및 내마모성이 우수한 PVD 코팅층이 코팅층수(Coating Layer)가 적어 증기 온도조절 밸브의 가혹한 조건에서 수명 유지가 어려운 문제점 있다.However, the conventional valve trim has a problem in that the PVD coating layer, which has high hardness and excellent wear resistance, has a small number of coating layers, making it difficult to maintain the service life under the harsh conditions of the steam temperature control valve.
또한, 종래의 밸브트림을 증기 온도 조절밸브에 적용하기 위해서는 알카리 수 환경에 화학 안정성이 높지 못한 문제점 있다.In addition, in order to apply the conventional valve trim to the steam temperature control valve, there is a problem in that the chemical stability is not high in an alkaline water environment.
본 발명은 상기 종래기술의 문제점을 해결하기 위한 것으로, 본 발명의 목적은, 5단 내지 8단의 유로 구성을 갖는 발전소 증기 온도 조절밸브의 밸브 트림의 밀봉부에 5개층 이상으로 이루어진 PVD 복합층을 형성하고, PVD 복합층의 위에 크롬나이트(CrN)층을 포함하도록 하여 고온 및 고압력의 알카리수 환경에 대해 밸브 수명을 연장시킬 수 있도록 하는 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브를 제공함에 있다.The present invention is to solve the problems of the prior art, and the purpose of the present invention is to provide a PVD composite layer consisting of five or more layers in the sealing part of the valve trim of a power plant steam temperature control valve having a 5- to 8-stage flow path configuration. Provides a power plant steam temperature control valve that can maintain a long lifespan by forming a chromiumite (CrN) layer on the PVD composite layer to provide durability to extend the life of the valve in a high temperature and high pressure alkaline water environment. It is in
본 발명을 달성하기 위한 기술적 사상으로 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브는, 유체가 흐르는 통로를 개방하거나 폐쇄함으로써 유체의 흐름을 제어하되, 5단 내지 8단의 유로 구성을 가지는 플러그와, 상기 플러그가 접촉되어지는 시트링를 포함하는 발전소 증기 온도조절밸브에 있어서, 상기 플러그와 시트링이 접촉되어 형성되는 각각의 밀봉부는, 모재의 표면에 코발트 계열 합금 용접봉인 스텔라이트(Stellite)를 이용하여 표면경화용접을 실시하여 형성된 경화용접층과, 상기 경화용접층의 위에 형성된 질화층과, 상기 질화층 위에 형성하되, 복합성분으로 5개층 이상으로 이루어진 PVD 복합층과, 상기 PVD 복합층 위에 형성된 크롬나이트(CrN)층을 포함하는 것이다.As a technical idea for achieving the present invention, a power plant steam temperature control valve capable of maintaining a long life by providing durability controls the flow of fluid by opening or closing the passage through which the fluid flows, and has a flow path configuration of 5 to 8 stages. In a power plant steam temperature control valve including a plug and a seat ring with which the plug is in contact, each sealing portion formed by contact between the plug and the seat ring is made of Stellite, a cobalt-based alloy welding rod, on the surface of the base material. A hardened welded layer formed by surface hardening welding using a hardened welded layer, a nitride layer formed on the hardened welded layer, a PVD composite layer formed on the nitrided layer and composed of five or more layers of composite components, and the PVD composite layer. It includes a chromite (CrN) layer formed on top.
또한, 상기 PVD 복합층의 복합성분은, 주 성분으로 Ti,Al,Cr,N,Si를 적용하도록 하는 것이다.In addition, the composite components of the PVD composite layer include Ti, Al, Cr, N, and Si as the main components.
또한, 상기 크롬나이트(CrN)층은, 크롬과 질화물의 혼합물로 구성되어 고압력 및 고온의 알카리수 환경에서 높은 화학 안전성을 가지며, 고온에서도 안전한 것이다.In addition, the chromium nitride (CrN) layer is composed of a mixture of chromium and nitride, so it has high chemical safety in a high-pressure and high-temperature alkaline water environment and is safe even at high temperatures.
또한, 상기 크롬나이트(CrN)층의 증착 두께는 0.1㎛ ~3.0㎛ 범위로 이루어진 것이다.In addition, the deposition thickness of the chromite (CrN) layer is in the range of 0.1㎛ to 3.0㎛.
본 발명을 달성하기 위한 기술적 사상으로 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브는, 5단 내지 8단의 유로 구성을 갖는 발전소 증기 온도 조절밸브의 밸브 트림의 밀봉부에 5개층 이상으로 이루어진 PVD 복합층을 형성하고, PVD 복합층의 위에 크롬나이트(CrN)층을 포함하도록 하여 고온 및 고압력의 알카리수 환경에 대해 밸브 수명을 연장시킬 수 있다.As a technical idea for achieving the present invention, a power plant steam temperature control valve capable of maintaining a long life by imparting durability according to the present invention is installed on the sealing part of the valve trim of the power plant steam temperature control valve having a 5-stage to 8-stage flow path configuration. By forming a PVD composite layer consisting of five or more layers and including a chromite (CrN) layer on top of the PVD composite layer, the life of the valve can be extended in an alkaline water environment of high temperature and high pressure.
도 1은 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브의 유로가 폐쇄된 상태의 단면도.
도 2는 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브의 유로가 개방된 상태의 단면도.
도 3은 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브의 밀봉부를 상세히 나타낸 단면도.Figure 1 is a cross-sectional view of the flow path of a power plant steam temperature control valve capable of maintaining a long life by providing durability according to the present invention in a closed state.
Figure 2 is a cross-sectional view of the flow path of a power plant steam temperature control valve that can maintain a long life by providing durability according to the present invention in an open state.
Figure 3 is a cross-sectional view showing in detail the sealing portion of a steam temperature control valve in a power plant capable of maintaining a long lifespan by imparting durability according to the present invention.
본 발명의 이점 및 특징, 그리고 그것들을 달성하는 방법은 첨부되는 도면과 함께 상세하게 후술 되어 있는 실시예들을 참조하면 명확해질 것이다. 그러나 본 발명은 이하에서 개시되는 실시예들에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 것이며, 단지 본 실시예들은 본 발명의 개시가 완전하도록 하며, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이며, 본 발명은 청구항의 기재에 의해 정의된다.The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the invention is defined by the claims.
한편, 본 명세서에서 사용된 용어는 실시예들을 설명하기 위한 것이며 본 발명을 제한하고자 하는 것은 아니다. 본 명세서에서, 단수형은 문구에서 특별히 언급하지 않는 한 복수형도 포함한다. 명세서에서 사용되는 "포함한다(comprises)" 및/또는 "포함하는(comprising)"은 언급된 구성소자, 단계, 동작 및/또는 소자에 하나 이상의 다른 구성소자, 단계, 동작 및/또는 소자의 존재 또는 추가함을 배제하지 않는다. 이하, 첨부된 도면을 참조하여 본 발명의 실시예를 상세히 설명하기로 한다.Meanwhile, the terms used in this specification are for describing embodiments and are not intended to limit the present invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” and/or “comprising” refers to the presence of one or more other elements, steps, operations and/or elements in the mentioned elements, steps, operations and/or elements. or addition is not excluded. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.
도 1은 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브의 유로가 폐쇄된 상태의 단면도이고, 도 2는 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브의 유로가 개방된 상태의 단면도이며, 도 3은 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브의 밀봉부를 상세히 나타낸 단면도이다.Figure 1 is a cross-sectional view of the flow path of a power plant steam temperature control valve capable of maintaining a long life by imparting durability according to the present invention in a closed state, and Figure 2 is a diagram of a power plant steam temperature control valve capable of maintaining a long life by imparting durability according to the present invention. It is a cross-sectional view with the flow path open, and Figure 3 is a cross-sectional view showing in detail the sealing part of the steam temperature control valve of a power plant that can maintain a long life by providing durability according to the present invention.
도 1 내지 도 3을 참고하면, 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브(100)는 유체가 흐르는 통로를 개방하거나 폐쇄함으로써 유체의 흐름을 제어하되, 5단 내지 8단의 유로 구성을 가지는 플러그(110)와, 상기 플러그(110)가 접촉되어지는 시트링(120)을 포함한다.Referring to Figures 1 to 3, the power plant steam
상기 플러그(110)와 시트링(120)이 접촉되어 형성되는 각각의 밀봉부(130)는, 경화용접층(131), 질화층(132), PVD 복합층(133) 및 크롬나이트(CrN)층(134)을 포함한다.Each sealing
상기 경화용접층(131)은, 모재의 표면에 코발트 계열 합금 용접봉인 스텔라이트(Stellite)를 이용하여 표면경화용접을 실시하여 형성된 것이다.The
상기 경화용접층(131)에 사용되는 용접봉은 코발트 계열중 내마모성,내열성,내식성 및 적정 경도를 얻을 수 있는 Stellite를 사용하며, Stellite는 코발트(Co)를 주성분으로하여 크롬(Cr),텅스텐(W)등을 첨가한 합금강이며, 경도가 높고, 내마모성과 아울러 내식성, 내열성이 우수하며, 특히 고온에서도 경도가 그다지 떨어지지 않은 장점을 가지고 있다.The welding rod used in the
상기 경화용접층(131)의 융착두께는 1.6mm ~ 6.4mm, 경도는 HRc 38 ~ 49로 이루어지며, 융착두께가 1.6mm 이하 시 융착층이 모재와 희석으로 인해 코팅층의 경도가 저하되고, 6.4mm 이상 시 제조경비가 많이 들며 발전소 설비 사용수명기준인 40년을 기준으로 경화용접층(310)의 마모도 계산을 하면 6.4mm의 두께까지가 최대 경화용접층(131)으로 볼 수 있다.The fusion thickness of the
상기 질화층(132)은, 상기 경화용접층(131) 위에 형성된 것이다.The
또한, 상기 질화층(132)의 두께는 30 ~ 40㎛이고, 경도는 Hv 750 ~950 로 이루어진 것이다.In addition, the thickness of the
상기 PVD 복합층(133)은, 상기 질화층(132) 위에 형성하되, 복합성분으로 5개층 이상으로 이루어진 것이다.The PVD
또한, 상기 PVD 복합층(133)의 복합성분은, 주 성분으로 Ti,Al,Cr,N,Si를 적용하도록 하는 것이다.In addition, the composite components of the PVD
상기 크롬나이트(CrN)층(134)은 상기 PVD 복합층(133)의 위에 형성된 것이다.The chromite (CrN)
또한, 상기 크롬나이트(CrN)층(134)은, 크롬과 질화물의 혼합물로 구성되어 고압력 및 고온의 알카리수 환경에서 높은 화학 안전성을 가지며, 고온에서도 안전한 것이다.In addition, the chromium nitride (CrN)
또한, 상기 크롬나이트(CrN)층(134)의 증착 두께는 0.1㎛ ~3.0㎛ 범위로 이루어진 것이다.In addition, the deposition thickness of the chromite (CrN)
이와 같이 구성된 본 발명에 따른 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브(100)는, 5단 내지 8단의 유로 구성을 가지는 플러그(110)와, 상기 플러그(110)가 접촉되어지는 시트링(120)을 열처리하게 되고, 이때 모재는 11Cr ~ 20Cr 스테인레스강으로 열처리는 담금질(Qunching) 및 뜨임(Tempering)을 하여 경도는 HRc 22 ~ 35를 얻는다.The power plant steam
또한, 열처리 한 모재의 표면은 1차 황삭가공하여 표면을 정리하게 된다.In addition, the surface of the heat-treated base material is cleaned by first roughing.
또한, 황삭가공으로 표면이 정리된 밀봉부에 경화육성 용접을 하게 되고, 용접 후에 응력제거를 하기 위해 열처리를 실시하고, 열처리 온도는 760 ~ 800℃에서 유지시간(Holding Time)은 30분이상 유지하고, 노냉하는 것이다.In addition, hardening welding is performed on the sealing part whose surface has been prepared through rough machining, and heat treatment is performed to relieve stress after welding. The heat treatment temperature is maintained at 760 ~ 800℃ and the holding time is maintained for more than 30 minutes. And it's a no-brainer.
상기 용접봉은 코발트계열중 내마모성,내열성,내식성 및 적정 경도를 얻을 수있는 Stellite를 사용한다.The welding rod uses Stellite, which has wear resistance, heat resistance, corrosion resistance, and appropriate hardness among the cobalt series.
또한, 용접 후 열처리단계 후에 밀봉부(130)를 정삭 및 연마하고, 경화용접층(131) 위에 질화층(132)을 형성하며, 상기 질화층(132) 형성단계에서 진공질화처리는 NH3+N2+Co2+RX 가스화 상태에서 온도는 380~550℃로 가열하고, 유지시간(Holding Time)은 10 ~ 36시간 유지하도록 하는 것이다.In addition, after the post-welding heat treatment step, the sealing
또한, 상기 질화층(132)이 형성된 밀봉부(130)를 버핑 및 세정하고, 질화층(132) 위에 PVD 복합층(133)을 형성한다.Additionally, the sealing
상기 PVD 복합층(133)은 5개층 이상으로 주 성분으로 Ti,Al,Cr,N,Si를 적용하여 코팅처리하게 된다.The PVD
또한, 상기 PVD 복합층(133)의 위에 크롬나이트(CrN)층을 증착 두께는 0.1㎛ ~3.0㎛ 범위로 코팅하여 고온, 고압의 알카리수 환경에서 높은 화학안전성을 가지게 된다..In addition, a chromium nite (CrN) layer is coated on the PVD
본 발명은 첨부된 도면에 도시된 일 실시예를 참고로 설명한 것이나, 당해 기술 분야의 통상의 지식을 가진 자들에게는 다양한 변형 및 다른 실시예가 가능하다는 점이 이해될 것이다.The present invention has been described with reference to an embodiment shown in the accompanying drawings, but it will be understood by those skilled in the art that various modifications and other embodiments are possible.
100: 발전소 증기 온도조절밸브
110: 플러그
120: 시트링
130: 밀봉부
131: 경화용접층
132: 질화층
133: PVD 복합층
134: 크롬나이트(CrN)층100: Power plant steam temperature control valve
110: plug
120: seat ring
130: sealing part
131: Hardened welding layer
132: Nitride layer
133: PVD composite layer
134: Chromite (CrN) layer
Claims (4)
상기 플러그가 접촉되어지는 시트링를 포함하는 발전소 증기 온도조절밸브에 있어서,
상기 플러그와 시트링이 접촉되어 형성되는 각각의 밀봉부는,
모재의 표면에 코발트 계열 합금 용접봉인 스텔라이트(Stellite)를 이용하여 표면경화용접을 실시하여 형성된 경화용접층과,
상기 경화용접층의 위에 형성된 질화층과,
상기 질화층 위에 형성하되, 복합성분으로 5개층 이상으로 이루어진 PVD 복합층과,
상기 PVD 복합층 위에 형성된 크롬나이트(CrN)층을 포함하는 것을 특징으로 하는 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브.
A plug that controls the flow of fluid by opening or closing a passage through which the fluid flows, and has a flow path configuration of 5 to 8 stages,
In the power plant steam temperature control valve including a seat ring with which the plug is in contact,
Each seal formed by contact between the plug and the seat ring,
A hardened weld layer formed by surface hardening welding on the surface of the base material using Stellite, a cobalt-based alloy welding rod, and
A nitride layer formed on the hardened weld layer,
A PVD composite layer formed on the nitride layer and composed of five or more layers of composite components,
A power plant steam temperature control valve capable of maintaining a high lifespan by imparting durability, comprising a chromite (CrN) layer formed on the PVD composite layer.
상기 PVD 복합층의 복합성분은, 주 성분으로 Ti,Al,Cr,N,Si를 적용하도록 하는 것을 특징으로 하는 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브.
According to paragraph 1,
The composite component of the PVD composite layer is a power plant steam temperature control valve capable of maintaining a long life by providing durability, characterized in that Ti, Al, Cr, N, and Si are used as main components.
상기 크롬나이트(CrN)층은, 크롬과 질화물의 혼합물로 구성되어 고압력 및 고온의 알카리수 환경에서 높은 화학 안전성을 가지며, 고온에서도 안전한 것을 특징으로 하는 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브.
According to paragraph 1,
The chrome nite (CrN) layer is composed of a mixture of chromium and nitride and has high chemical safety in a high-pressure and high-temperature alkaline water environment. It is a power plant steam temperature control valve that can maintain a long life by providing durability and being safe even at high temperatures. .
상기 크롬나이트(CrN)층의 증착 두께는 0.1㎛ ~3.0㎛ 범위로 이루어진 것을 특징으로 하는 내구성 부여로 고수명 유지가 가능한 발전소 증기 온도조절밸브.
According to paragraph 1,
A power plant steam temperature control valve capable of maintaining a long lifespan by imparting durability, characterized in that the deposition thickness of the chromite (CrN) layer is in the range of 0.1㎛ ~ 3.0㎛.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150143846A (en) * | 2013-10-02 | 2015-12-23 | 이글 고오교 가부시키가이샤 | Check valve |
| KR102100280B1 (en) | 2019-12-10 | 2020-04-13 | 김충호 | A method for manufacturing of valve trim for improving performance Using harsh conditions of Electric Power Plant and valve trim thereof |
| KR102625010B1 (en) * | 2023-07-19 | 2024-01-15 | 김충호 | Valve trim of cryogenic valves having a high-durability film of austenitic stainless steel surface in cryogenic fluids and surface hardening methods thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150143846A (en) * | 2013-10-02 | 2015-12-23 | 이글 고오교 가부시키가이샤 | Check valve |
| KR102100280B1 (en) | 2019-12-10 | 2020-04-13 | 김충호 | A method for manufacturing of valve trim for improving performance Using harsh conditions of Electric Power Plant and valve trim thereof |
| KR102625010B1 (en) * | 2023-07-19 | 2024-01-15 | 김충호 | Valve trim of cryogenic valves having a high-durability film of austenitic stainless steel surface in cryogenic fluids and surface hardening methods thereof |
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