KR20160059293A - Apparatus for absorbing thermal strain to prevent crack of hsrg casing - Google Patents
Apparatus for absorbing thermal strain to prevent crack of hsrg casing Download PDFInfo
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- KR20160059293A KR20160059293A KR1020140160998A KR20140160998A KR20160059293A KR 20160059293 A KR20160059293 A KR 20160059293A KR 1020140160998 A KR1020140160998 A KR 1020140160998A KR 20140160998 A KR20140160998 A KR 20140160998A KR 20160059293 A KR20160059293 A KR 20160059293A
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- casing
- heat sink
- present
- thermal
- heat recovery
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- 238000011084 recovery Methods 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 16
- 239000002918 waste heat Substances 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 238000010248 power generation Methods 0.000 description 9
- 239000003351 stiffener Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000008646 thermal stress Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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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
- F22B37/42—Applications, arrangements or dispositions of alarm or automatic safety devices
- F22B37/47—Applications, arrangements or dispositions of alarm or automatic safety devices responsive to abnormal temperature, e.g. actuated by fusible plugs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/022—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being wires or pins
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/005—Other auxiliary members within casings, e.g. internal filling means or sealing means
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- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
본 발명의 일실시예는 폐열회수보일러 케이싱의 균열 방지를 위한 열변형 흡수설비로서, 가스터빈 배가스 유출구를 통해 유입된 배가스에 의하여 표면 온도차가 발생하는 부위에 부착되는 열전도 패드와, 상기 열전도 패드의 상측에 마련되는 히트 싱크를 포함하며, 상기 히트 싱크의 표면에는 상측으로 돌출된 복수개의 핀이 마련되는 것을 특징으로 하는 열변형 흡수설비를 제공한다.One embodiment of the present invention is a thermal deformation absorption apparatus for preventing cracks in a waste heat recovery boiler casing, the system comprising: a thermal conductive pad attached to a site where a surface temperature difference is generated by an exhaust gas flowing through a gas turbine exhaust outlet; And a plurality of fins protruding upward are provided on a surface of the heat sink.
Description
본 발명은 폐열회수보일러 케이싱의 균열 방지를 위한 열변형 흡수설비에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat distortion absorbing apparatus for preventing cracks in a waste heat recovery boiler casing.
폐열회수보일러(HSRG: Heat Recovery Steam Generator)는 에너지의 효율적 사용을 위해 복합화력발전에 구비되는 장치이다. 복합화력발전은 둘 이상의 발전 사이클을 결합시켜 높은 열효율을 얻기 위한 발전 시스템으로서, 1차 발전 사이클인 가스터빈의 배열을 폐열회수보일러에서 증기로 전환하여 2차 발전 사이클인 증기터빈에서 회수하는 시스템이다.Heat Recovery Steam Generator (HSRG) is a device installed in a combined cycle power plant for efficient use of energy. Combined-Cycle Power Generation System is a system that combines two or more power generation cycles to obtain high thermal efficiency. The system converts the arrangement of gas turbines, the first generation cycle, from waste heat recovery boiler to steam, and recovers them from steam turbines in the secondary power generation cycle .
도 1은 복합화력발전 시스템의 계통도이며, 여기서 가스터빈 발전기(G.T. Generator), 가스터빈(Gas Turbine), 폐열회수보일러(HSRG), 및 증기터빈 발전기(S.T. Generator)의 배치를 확인할 수 있다.FIG. 1 is a schematic diagram of a combined-cycle power generation system in which the arrangement of a gas turbine generator (G.T. Generator), a gas turbine, a waste heat recovery boiler (HSRG), and a steam turbine generator (S.T. Generator) can be confirmed.
복합화력발전시스템은 첨두부하용으로 많이 이용되고 있으며, 운전방식으로는 일일기동정지(daily start and stop) 방식을 취하고 있어 내부 유동의 균일성이나 구조적인 측면에서 시스템에 부정적인 결과를 촉발시키고 있다. 특히 실제 사용환경을 조사하면 연중 200회 이상 기동 및 정지를 행하게 되는데, 이는 시스템의 운전환경이 가혹하다는 것을 보여주며, 이러한 기동정지의 반복에 따라 폐열회수보일러의 케이싱의 특정 부위에 열응력이 집중되어 균열이 가고 파손이 발생하게 된다.The combined-cycle power generation system is widely used for peak load, and the daily start and stop method is used as the operation method, which causes a negative result in the system in terms of the uniformity of the internal flow and the structural aspect. In particular, when the actual operating environment is investigated, it is seen that the operating environment of the system is harsh and that the operation and stop of the system are performed more than 200 times a year, and that thermal stress is concentrated on a specific portion of the casing of the waste heat recovery boiler So that cracks are generated and breakage occurs.
본 발명은 전술한 문제를 해결하기 위한 것으로, 복합화력발전시스템 등에 사용되는 폐열회수보일러의 케이싱에 있어서 열응력에 취약한 부위의 균열 및 파손을 방지할 수 있는 열변형 흡수 설비를 제공하는 것을 기술적 과제로 한다.Disclosure of the Invention The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a thermal deformation absorbing facility capable of preventing cracks and breakage of a region vulnerable to thermal stresses in a casing of a waste heat recovery boiler used for a combined- .
상기 과제를 달성하기 위하여, 본 발명의 일실시예는 폐열회수보일러 케이싱의 균열 방지를 위한 열변형 흡수설비로서, 가스터빈 배가스 유출구를 통해 유입된 배가스에 의하여 표면 온도차가 발생하는 부위에 부착되는 열전도 패드와, 상기 열전도 패드의 상측에 마련되는 히트 싱크를 포함하며, 상기 히트 싱크의 표면에는 상측으로 돌출된 복수개의 핀이 마련되는 것을 특징으로 하는 열변형 흡수설비를 제공한다.In order to achieve the above object, an embodiment of the present invention is a thermal deformation absorption apparatus for preventing cracks in a waste heat recovery boiler casing, the system comprising: a heat conduction unit that is installed on a site where a surface temperature difference is generated by an exhaust gas flowing through a gas turbine exhaust outlet, And a heat sink provided above the heat conductive pad, wherein a plurality of fins protruding upward is provided on a surface of the heat sink.
본 발명의 일실시예에 있어서, 상기 열전도 패드는 그래파이트로 이루어질 수 있다.In one embodiment of the present invention, the thermally conductive pad may be made of graphite.
상기에서 설명한 본 발명의 일실시예에 의하면, 복합화력발전시스템 등에 사용되는 폐열회수보일러의 케이싱에 있어서 열응력에 취약한 부위의 균열 및 파손을 방지할 수 있는 열변형 흡수 설비를 제공할 수 있게 된다.According to the embodiment of the present invention described above, it is possible to provide a thermal deformation absorption facility that can prevent cracks and breakage of a portion vulnerable to thermal stress in a casing of a waste heat recovery boiler used in a combined thermal power generation system or the like .
본 발명의 효과는 상기한 효과로 한정되는 것은 아니며, 본 발명의 상세한 설명 또는 특허청구범위에 기재된 발명의 구성으로부터 추론가능한 모든 효과를 포함하는 것으로 이해되어야 한다.It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.
도 1은 복합화력발전 시스템의 계통도이다.
도 2는 복합화력발전 시스템에 설치된 폐열회수보일러의 계통도이다.
도 3은 폐열회수보일러 케이싱 내부 온도변화 추이 및 설비 개요도이다.
도 4는 케이싱 구조물의 파손 유형을 나타낸 도면이다.
도 5 및 도 6은 폐열회수보일러의 구조적 취약부위에 부착되는 열변형 방지설비의 동작을 나타내는 모식도이다.
도 7은 실제 케이싱 내의 온도 측정 위치를 나타낸 개요도이다.
도 8은 본 발명의 일실시예에 따른 히트싱크의 사시이며, 도 9는 히트싱크에 부착되는 핀의 다양한 형상을 나타내는 개요도이다.
도 10은 Heat Sink 프로토타입 시공 개념도이다.1 is a schematic diagram of a combined-cycle thermal power generation system.
2 is a schematic diagram of a waste heat recovery boiler installed in a combined-cycle power generation system.
Fig. 3 is a schematic view of the internal temperature change of the waste heat recovery boiler casing and the equipment.
4 is a view showing a breakage type of the casing structure.
5 and 6 are schematic views showing the operation of a thermal deformation preventing apparatus attached to a structural weak portion of a waste heat recovery boiler.
7 is a schematic view showing a temperature measurement position in an actual casing.
FIG. 8 is a perspective view of a heat sink according to an embodiment of the present invention, and FIG. 9 is a schematic view showing various shapes of a pin attached to the heat sink.
10 is a conceptual view of a heat sink prototype construction.
이하에서는 첨부한 도면을 참조하여 본 발명을 설명하기로 한다. 그러나 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며, 따라서 여기에서 설명하는 실시예로 한정되는 것은 아니다. 그리고 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 유사한 부분에 대해서는 유사한 도면 부호를 붙였다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.
명세서 전체에서, 어떤 부분이 다른 부분과 "연결"되어 있다고 할 때, 이는 "직접적으로 연결"되어 있는 경우뿐 아니라, 그 중간에 다른 부재를 사이에 두고 "간접적으로 연결"되어 있는 경우도 포함한다. 또한 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 구비할 수 있다는 것을 의미한다.Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.
이하 첨부된 도면을 참고하여 본 발명의 실시예를 상세히 설명하기로 한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 2는 복합화력발전 시스템에 설치된 폐열회수보일러의 계통도이고, 도 3은 폐열회수보일러 케이싱 내부 온도변화 추이 및 설비 개요도이다.FIG. 2 is a system diagram of a waste heat recovery boiler installed in a combined-cycle thermal power generation system, and FIG. 3 is a schematic diagram of a temperature change and a facility overview of a waste heat recovery boiler casing.
도시된 바와 같이, 가스 유입구(Gas Inlet) 부분의 케이싱(Casing)은 내부 및 외부 보온재로 보호되어 있으며 전열관 입구부터 스택(Stack) 입구까지는 외부 보온재로만 보호되어 있다. 이로 인해 전열관 입구부위 케이싱의 표면온도차가 심하게 발생된다.As shown in the figure, the casing of the gas inlet portion is protected by the inner and outer heat insulating materials, and only the outer heat insulating material is protected from the inlet of the heat transfer tube to the inlet of the stack. As a result, the surface temperature difference of the casing at the entrance of the heat transfer pipe is severely generated.
한편, 전열관 입구부터는 배기가스와 전열관과의 열교환이 이루어져 배기가스 온도가 가스 유입구와 전열관 RH, SH 사이에서 급격히 떨어져 그 주위 케이싱의 표면온도차가 심하게 발생된다.On the other hand, since the heat exchange between the exhaust gas and the heat transfer pipe is performed from the inlet of the heat transfer pipe, the exhaust gas temperature abruptly falls between the gas inlet and the heat transfer pipes RH and SH, and the surface temperature difference of the surrounding casing is seriously generated.
또한 벅 스테이(Buck Stay) 및 스티프너(Stiffener)와 케이싱의 구속으로 인해 자유로운 열팽창 차이를 흡수하지 못하고, 케이싱과 스티프너의 두께 차이에 따른 열 팽창양이 상이하다(Casing 6t, Stiffener 12.7t).In addition, due to the constraint of buckstays and stiffeners and casing, the thermal expansion difference can not be absorbed freely, and the amount of thermal expansion due to the difference in thickness between the casing and the stiffener is different (Casing 6t, Stiffener 12.7t).
도 4는 케이싱 구조물의 파손 유형을 나타낸 도면이다.4 is a view showing a breakage type of the casing structure.
도시된 바와 같이, 구조적 취약부위에서는 맨홀주변 균열, 케이싱 균열, 스티프너 절손 등의 구조물 파손 사례가 발생한다.As shown, in the structurally fragile area, structural damage such as cracks in the perimeter of the manhole, cracks in the casing, and stiffener breakage occur.
도 5 및 도 6은 폐열회수보일러의 구조적 취약부위에 부착되는 열변형 방지설비의 동작을 나타내는 모식도이다.5 and 6 are schematic views showing the operation of a thermal deformation preventing apparatus attached to a structural weak portion of a waste heat recovery boiler.
본 발명은 폐열회수보일러 케이싱의 균열 방지를 위한 열변형 흡수설비로서, 가스터빈 배가스 유출구를 통해 유입된 배가스에 의하여 표면 온도차가 발생하는 부위에 부착되는 열전도 패드와(Thermal Interface Pad), 이 열전도 패드의 상측에 마련되는 히트 싱크(Heat Sink)를 포함한다.The present invention relates to a thermal deformation absorption device for preventing cracks in a waste heat recovery boiler casing, which comprises a thermal interface pad (Thermal Interface Pad) attached to a portion where a surface temperature difference is generated by an exhaust gas flowing through a gas turbine exhaust gas outlet, And a heat sink provided on the upper side of the heat sink.
히트 싱크의 표면에는 상측으로 돌출된 복수개의 핀이 마련된다.A plurality of pins protruding upward is provided on the surface of the heat sink.
이러한 열변형 흡수설비는 케이싱에 마련된 스티프너(보강재)에 설치될 수 있으며, 이의 설치에 의해 열분산이 이루어지게 된다.Such a thermal deformation absorption apparatus can be installed in a stiffener (a stiffener) provided in a casing, and heat dissipation can be achieved by the installation.
열전도 패드는 그래파이트(Graphite)로 이루어지며, 히트 싱크는 SS400 등의 강재로 이루어질 수 있다.The heat conducting pad is made of graphite, and the heat sink can be made of steel such as SS400.
이러한 열변형 흡수설비를 설치하기 전에는 케이싱 온도가 약 400도, 스티프너 온도가 약 310도로서, 그 차이가 90도에 달하였으나, 열변형 흡수설비를 설치한 후에는 케이싱 온도가 350도, 스티프너 온도가 약 330~340도로서, 그 차이가 약 20~30도로 현저히 감소하게 되었다(도 6 참조). 참고로, 도 7은 실제 케이싱 내의 온도 측정 위치를 나타낸 개요도이다. 다양한 영역에서 온도를 측정한 결과, RH 및 SH 영역에서 최대 100도에 가까운 온도편차가 발생함을 알 수 있었다.The temperature of the casing was about 400 ° C. and the temperature of the stiffener was about 310 ° C., and the difference reached 90 ° C. However, after the installation of the thermal deformation absorber, the casing temperature was 350 ° C. and the stiffener temperature Was about 330 to 340 degrees, and the difference was remarkably decreased by about 20 to 30 degrees (see FIG. 6). 7 is a schematic view showing a temperature measurement position in an actual casing. As a result of measuring the temperature in various regions, it was found that a temperature deviation close to 100 degrees occurs in the RH and SH regions.
이러한 온도편차가 큰 부위에 히트싱크를 부착함으로써, 대부분의 영역에서 열응력이 감소하게 되며, 특히 영역별로 최대 44%까지 열응력이 감소하게 됨을 알 수 있었다.By attaching the heat sink to a region with a large temperature deviation, the thermal stress is reduced in most regions, and the thermal stress is reduced by up to 44% in each region.
도 8은 본 발명의 일실시예에 따른 히트싱크의 사시이며, 도 9는 히트싱크에 부착되는 핀의 다양한 형상을 나타내는 개요도이다.FIG. 8 is a perspective view of a heat sink according to an embodiment of the present invention, and FIG. 9 is a schematic view showing various shapes of a pin attached to the heat sink.
히트싱크에 설치되는 핀은 열 발산에 있어 중요한 구조적 요소이며, 그 형상(두께와 높이 등), 위치, 및 개수 등의 변수는 가동 조건 등에 따라 최적 설계를 통해 도출해 낸다. 도 9와 같이, 일직선 상에 배치된 핀, 엇갈린 위치에 2열로 배치된 핀, 4열로 배치된 핀, 8열로 배치된 핀 등이 히트싱크에 마련될 수 있다.The pins installed in the heat sink are important structural elements for heat dissipation. The shape (thickness and height, etc.), position, and number of variables are derived through optimal design according to operating conditions and so on. As shown in Fig. 9, the heat sink may be provided with fins arranged in a straight line, fins arranged in two rows in a staggered position, fins arranged in four rows, and fins arranged in eight rows.
도 10은 Heat Sink 프로토타입 시공 개념도이다. 최적설계를 통해 도출된 히트싱크를 포함한 열흡수 설비를 케이싱의 스티프너에 설치하게 된다.10 is a conceptual view of a heat sink prototype construction. The heat absorbing device including the heat sink derived from the optimum design is installed in the stiffener of the casing.
전술한 본 발명의 설명은 예시를 위한 것이며, 본 발명이 속하는 기술분야의 통상의 지식을 가진 자는 본 발명의 기술적 사상이나 필수적인 특징을 변경하지 않고서 다른 구체적인 형태로 쉽게 변형이 가능하다는 것을 이해할 수 있을 것이다. 그러므로 이상에서 기술한 실시예들은 모든 면에서 예시적인 것이며 한정적이 아닌 것으로 이해해야만 한다. 예를 들어, 단일형으로 설명되어 있는 각 구성 요소는 분산되어 실시될 수도 있으며, 마찬가지로 분산된 것으로 설명되어 있는 구성 요소들도 결합된 형태로 실시될 수 있다.It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.
본 발명의 범위는 후술하는 특허청구범위에 의하여 나타내어지며, 특허청구범위의 의미 및 범위 그리고 그 균등 개념으로부터 도출되는 모든 변경 또는 변형된 형태가 본 발명의 범위에 포함되는 것으로 해석되어야 한다.The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.
Claims (2)
가스터빈 배가스 유출구를 통해 유입된 배가스에 의하여 표면 온도차가 발생하는 부위에 부착되는 열전도 패드와,
상기 열전도 패드의 상측에 마련되는 히트 싱크를 포함하며,
상기 히트 싱크의 표면에는 상측으로 돌출된 복수개의 핀이 마련되는 것을 특징으로 하는 열변형 흡수설비.
Waste Heat Recovery As a thermal deformation absorber for preventing cracking of a boiler casing,
A heat conduction pad attached to a portion where a surface temperature difference is generated by the exhaust gas flowing through the gas turbine exhaust outlet,
And a heat sink provided above the thermally conductive pad,
Wherein a plurality of fins protruding upward is provided on a surface of the heat sink.
상기 열전도 패드는 그래파이트로 이루어진 것을 특징으로 하는 열변형 흡수설비.
The method according to claim 1,
Wherein the thermal conductive pad is made of graphite.
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| KR1020140160998A KR20160059293A (en) | 2014-11-18 | 2014-11-18 | Apparatus for absorbing thermal strain to prevent crack of hsrg casing |
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| KR1020140160998A KR20160059293A (en) | 2014-11-18 | 2014-11-18 | Apparatus for absorbing thermal strain to prevent crack of hsrg casing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160104496A (en) * | 2015-02-26 | 2016-09-05 | 주식회사 한종이엔지 | Apparatus for absorbing thermal strain to prevent crack of hsrg casing |
| CN120720581A (en) * | 2025-08-26 | 2025-09-30 | 福建圣农发展股份有限公司 | A high-efficiency natural gas boiler |
-
2014
- 2014-11-18 KR KR1020140160998A patent/KR20160059293A/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160104496A (en) * | 2015-02-26 | 2016-09-05 | 주식회사 한종이엔지 | Apparatus for absorbing thermal strain to prevent crack of hsrg casing |
| CN120720581A (en) * | 2025-08-26 | 2025-09-30 | 福建圣农发展股份有限公司 | A high-efficiency natural gas boiler |
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