• 제목/요약/키워드: Heat recovery system

검색결과 457건 처리시간 0.026초

120MW급 열병합 복합발전시스템의 열역학적 효율 특성 (The thermodynamic efficiency characteristics of combined cogeneration system of 120MW)

  • 최명진;김홍주;김병헌
    • 한국산학기술학회논문지
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    • 제18권6호
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    • pp.29-36
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    • 2017
  • 본 논문은 열병합 복합발전이란 하나의 프로세스에서 전기 또는 기계 동력과 열에너지의 두 형태를 생산하는 것이다. 가스터빈 열병합 발전 시스템의 각 구성부의 성능을 변수로 전체 시스템의 연료 소모와 각 구성부의 열과 전기의 성능을 표현하여야 한다. 전체시스템은 상부 시스템인 가스터빈 2대와 하부시스템인 열회수 증기발생기(HRSG) 2대, 증기터빈 1대, 지역난방열교환기 2대로 구성되어 있다. 가스터빈 열병합 복합발전시스템에서 가동시간 기준 10,000시간 후 성능시험을 각종 시험장치 설치 및 ASME PTC 46에 준한 성능시험으로 실시하였고, 발전소 전체의 종합출력과 효율에 대한 성능을 분석하였다. 이러한 성능시험 실시자료를 기초로 시험성능을 비교하여 성능변화 값을 확인하였다. 이 논문에서 가스터빈, 열회수 증기발생기, 증기터빈의 열역학적 시스템 해석을 통하여 이론적 결과 값을 산출하였다. 비교 대상은 전체 시스템의 생산열량과 대기로 배출되는 열량을 이론값과 실험값을 비교하였고, 전기출력 및 열 출력에 대한 효율을 이론값과 실제 값을 비교하였다. 가스터빈 열병합 복합발전소 성능 특성에 대한 시험결과를 열역학적 효율 특성과 비교하였으며, 0.3%의 오차를 보였다.

열교환기망과 열시스템과의 최적 합성에 관한 연구 (A study on the optimal integration of heat exchanger network and heat system)

  • 안재성;이재효;김덕호
    • 설비공학논문집
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    • 제11권6호
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    • pp.799-807
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    • 1999
  • Exergy analysis is widely used in energy system analysis for more efficient energy use. Pinch technology has focused on chemical plants, such as pure heat exchanger networks. In this study, the objective is to seek more effective means with integrating above two methods. In order to demonstrate effective result and to prove possibility for pinch analysis, the steam turbine is adopted to make heat recovery in the heat exchanger network. Three cases are introduced using the integration of exergy and pinch analysis. The standard steam turbine utility is the base case, and adding the heat pump to this system is the second case. The third case is the system with the heat pump and minimum utilities. The results show that the output power of steam turbine in the case(2) and case(3) are increased up to 42% and 46%, respectively, compared with that of base case.

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밀폐형 2상 열사이폰의 열전달 특성에 관한 실험적 연구 (An Experimental Study on the Heat Transfer Characteristics of Two-phase closed Thermosyphon)

  • 조기현;백이;정형길
    • 한국산업융합학회 논문집
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    • 제5권3호
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    • pp.165-171
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    • 2002
  • The thermosyphon has been used as a heat transmission device in the heat recovery of low level energy and cooling for heat generating equipments. Many studies on the working fluids and wicks have been reported to improve the heat transfer efficiency of the thermosyphon. A low temperature heat pipe with acetone is chosen in the present study to compare the heat transfer characteristics due to pouring amount of working fluid, magnitude of power supplied and tilt angles. The thermosyphon made ⵁ$15.88{\times}0.8t{\times}600mm$ of copper, evaporation section 200mm, insulation section 25mm, condensation 375mm. Heat transfer rate of the thermosyphon increase as magnitude of power supplied increase and observe dry out phenomenon at 5~10% of pouring amount of working fluid. So thermosyphon at the 150kJ/s judged to need 12% or more. Heat transfer rate of the thermosyphon have nothing to do with tilt angles. Dry out phenomenon of the thermo syphon makes it possible that a low temperature thermosyphon may be used to control temperature and heat transfer of a system when the critical quantity of a working fluid is supplied in the thermosyphon.

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관류형 열회수 증기발생기와 증기터빈 시스템의 성능해석 (Performance Analysis of Once-through HRSG and Steam Turbine System)

  • 양진식;김동섭;노승탁
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 추계학술대회논문집B
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    • pp.872-877
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    • 2001
  • This study analyzed the design performance of the bottoming system of combined cycle power plants adopting a single-pressure once-through heat recovery steam generator with reheat. A computer program was constructed and parametric analyses were carried out to present the criteria for determining the reheat pressure and the location of the starring point of the reheater in the HRSG. The performance of the bottoming system was presented for the range from high subcritical to supercritical pressures. It was founded that the power of the bottoming system can be as high as that of the present triple-pressure bottoming system even with a higher exhaust gas temperature. A requirement for this high performance is a proper arrangement of the reheater.

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열회수를 고려한 소형 증기분사 가스터빈 시스템 해석 (Analysis of a small steam injected gas turbine system with heat recovery)

  • 김동섭;조문기;고상근;노승탁
    • 대한기계학회논문집B
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    • 제21권8호
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    • pp.996-1008
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    • 1997
  • This paper describes a methodology and results for the analysis of a small steam injected gas turbine cogeneration system. A performance analysis program for the gas turbine engine is utilized with modifications required for the model of steam injection and the heat recovery steam generator (HRSG). The object of simulation is a simple cycle gas turbine engine under development which adopts a centrifugal compressor. The analysis is based on the off-design operation of the gas turbine and the compressor performance map is utilized. Analyses are carried out with the injection ratio as the main parameter. The effect of steam injection on the power and efficiency of gas turbine and cogeneration capacity is investigated. Also presented is the variation in the main operating parameters inside the HRSG. Remarkable reduction in NOx generation by steam injection is confirmed. In addition, it is observed that for the 100% power operation the temperature of the cooled first nozzle blade decreases by 100.deg. C at full steam injection, which seems to have a favorable effect on the engine life time.

엔진 배기열 회수 증발기 설계를 위한 유기랭킨사이클 분석 (Analysis of organic rankine cycle for designing evaporator of engine exhaust heat recovery system)

  • 고제현;최병철;박권하
    • Journal of Advanced Marine Engineering and Technology
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    • 제37권5호
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    • pp.446-452
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    • 2013
  • 탄소저감 기술과 함께 에너지 효율 향상에 대한 관심이 증가하고 있다. 엔진에서 대기로 방출되는 배기에너지는 전체에너지의 30%가 넘는 많은 양이며 배기열을 회수하기 위한 많은 연구가 진행되고 있다. 본 연구에서는 선행연구를 통하여 제시한 디젤엔진에서의 최적 열 회수 조건에 대한 랭킨사이클을 분석하였다. 그 결과 질량유량비와 압력비가 각각 0.6, 0.7 일 때 엑서지 효율과 출력은 0.53, 1.43 kW을 나타내었다.

주거용 건물의 지하수 이용 지열 히트펌프 시스템의 난방성능 특성에 관한 연구 (Research on the heating performance of SCW heat pump system for residential house)

  • 김주화;김주영;홍원화;안창환
    • 한국주거학회:학술대회논문집
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    • 한국주거학회 2008년도 춘계학술발표대회 논문집
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    • pp.431-435
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    • 2008
  • Geothermal heat pump system using standing column wells as their ground heat exchanger can be used as a highly efficient source of heating and cooling in massive buildings. But there is no case of a small scale residential house. So this study estimated heating coefficient of performance(COP) of geothermal heat pump system using standing column well type which is excellent in heat recovery in the residential house. As a result of analysis, The COP of heat pump is over average 6 and is excellent. And in consequence of making a comparative study according to the bleeding, the cop is higher in the case of bleeding. Therefore, bleeding affects the performance of the system. This study has shown performance result that stands on actual data. Therefore, this study provides ground data that needs when a low capacity of system designs for a residence with confidence elevation.

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소규모 산업 폐열회수용 열전발전시스템의 출력 특성에 관한 실험적 연구 (Experimental Study of Power Generation Performance of Small-Scale Thermoelectric System)

  • 정재훈;김우철;이진호;유태우
    • 대한기계학회논문집B
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    • 제34권4호
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    • pp.383-390
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    • 2010
  • 본 연구에서는 폐열 회수를 위한 열전 발전 시스템을 구성하였다. 열전 모듈은 스테인레스 스틸덕트 내부에 부착되고, 뜨거운 공기를 불어넣는 장치가 덕트의 입구에 마주한 형태를 취하였다. 이 때 고온부의 온도가 균일한 상태에서 낼 수 있는 최대 파워를 구해내었다. 결과적으로 모듈에 가해지는 최적화된 압력이 있었다. 또한 열전 발전의 성능을 열전 모듈의 저온부의 열 싱크에 의하여 결정되었다. 자연대류 형식의 열 싱크에서 낼 수 있는 파워가 5배 가량 차이가 났다.

물분사 폐열회수 보일러의 효용성에 대한 실험적 검증 (Experimental Validation on Performance of Waste-heat-recovery Boiler with Water Injection)

  • 신재훈;박태준;조현석;유준상;문석수;이창언
    • 한국분무공학회지
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    • 제28권1호
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    • pp.43-48
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    • 2023
  • The waste-heat-recovery boiler with water spray (HR-B/WS) applies the heat exchange between the inlet air and exhaust gas with the water spray into the inlet air. The evaporation of water in the inlet air promotes heat recovery from the exhaust gas so that thermal efficiency can be improved by the enhanced condensing effect. The NOx emission can also be reduced by lowering the flame temperature due to the dilution effect of the water. In this study, the validity of this concept is examined by the practical boiler test performed with a 24 kW condensing boiler under the full load condition according to the water injection amount. The theoretical amount of water injection is calculated under the assumption of full evaporation of the sprayed water, which is calculated as 50 g/min. Since the injected water cannot evaporate fully in the actual system, the maximum water spray amount is set as 100 g/min. The results showed that the water injection can increase the thermal efficiency up to 95.59% and reduce NOx and CO emissions simultaneously to 8.9 ppm and 35 ppm at 0% of O2. Although the heat energy loss increased due to the unevaporated water, the increase in water injection amount caused higher thermal efficiency due to the increased amount of the evaporated water.

다공형 유로를 적용한 전열교환기 소자의 성능향상에 관한 연구 (A Study on Improvement of Performance for Perforated Type Total HEX Element)

  • 곽경민;배철호;김지용;주의성
    • 설비공학논문집
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    • 제19권7호
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    • pp.529-536
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    • 2007
  • The perforated type element for a heat recovery ventilation system has been studied to improve the performance. Four holes of diameter of 6mm are punched out for each flow channel to break the boundary layer development and increase the turbulence. KS cooling and heating conditions and test procedures are applied for study. The efficiencies are compared to those of the typical element with smooth surface. For cooling operations, the temperature, latent and enthalpy efficiencies increase 2.5%, 18% and 8%, respectively. For heating operations, the temperature, latent and enthalpy efficiencies increase 3%, 5% and 3.2%, respectively.