[논문]배열회수보일러 기수분리기의 응력해석 및 평가

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doi:10.14775/ksmpe.2018.17.4.023

배열회수보일러 기수분리기의 응력해석 및 평가
Stress Analysis and Evaluation of Steam Separator of Heat Recovery Steam Generator (HRSG) 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.17 no.4, 2018년, pp.23 - 31

Abstract ▼ AI-Helper

Stress of a steam separator, equipment of the high-pressure (HP) evaporator for a HRSG, was analyzed and evaluated according to ASME Boiler & Pressure Vessel Code Section VIII Division 2. First, from the analysis results of the piping system model of the HP evaporator, reaction forces of the riser tubes connected to the steam separator, i.e., nozzle loads, were derived. Next, a finite element model of the steam separator was constructed and analyzed for the design pressure and the nozzle loads. The results show that the maximum stress occurred at the bore of the riser nozzle. The primary membrane stresses at the shell and nozzle were found to be less than the allowable stress. Next, the steam separator was analyzed for the steady-state operating conditions of operating pressure, operating temperature, and nozzle loads. The maximum stress occurred at the bore of the riser nozzle. The primary plus secondary membrane plus bending stress at the shell and nozzle was found to be less than the allowable stress.

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문제 정의

The separated steam is directed to the superheater and the remaining saturated water is transferred to the suction side in the feedwater pump through the water collecting vessel, and this is recirculated as supplied water. This study aims to analyze the stress in the design condition and the steady-state operating conditions in the steam separator in the HP EVA of a Benson-type HRSG to evaluate its safety.

제안 방법

2. The analysis model of the steam separator was created and static structural analysis was conducted with regard to the design condition. The maximum stress occurred at the corner of the rise nozzle bore.
3. The static structural analysis was conducted with regard to the analysis model of the steam separator. The maximum stress occurred at the corner of the rise nozzle bore.
5, and static structural analysis was conducted with regard to the entire load (design pressure, design temperature, and dead weight) using ANSYS. The steam separator in the piping system analysis model was modeled with SHELL63, which was a four-node shell element, to consider the cylindrical shape as shown in Fig. 6, and the riser tubes were modeled with PIPE16, which was a two-node pipe element, to enable the extraction of the nozzle load at the riser tube cross-section.
A finite element model of the steam separator was made for this and a static structural analysis was conducted using ANSYS^[14]. This study evaluated whether the membrane stress and membrane plus bending stress at the shell and nozzle cross-section satisfied the acceptance criteria of the ASME code at the nozzle bore where the maximum stress was occured due to the stress concentration, which was determined from the analysis results.
Thus, it is necessary to verify the safety according to the technical standards when the steam separators were designed. This study evaluates the conformance to the design through stress analysis of the design conditions and steady-state condition in accordance with the ASME code regarding the steam separator. A finite element model of the steam separator was made for this and a static structural analysis was conducted using ANSYS^[14].
This study performed a structural analysis of the design and steady-state operating conditions with regard to the steam separator of the HP EVA in the HRSG and evaluated the design conformance in accordance with the ASME code, which was a technical standard. This study’s conclusions are summarized as follows:
This study targets a steam separator, which is one of the pressure vessels that make up a high-pressure (HP) evaporator (EVA) in a Benson-type HRSG^[4] . The HP EVA in the Benson-type HRSG consists of two evaporators: EVA1 and EVA2, as shown in the flowchart of Fig.

대상 데이터

The material of the cylindrical shell and steam outlet nozzle was SA335-P22, and that of the riser nozzle was SA182-F11 CL2. The design temperature, design pressure, operating temperature, and operating pressure of the steam separator were 423.

이론/모형

This study evaluates the conformance to the design through stress analysis of the design conditions and steady-state condition in accordance with the ASME code regarding the steam separator. A finite element model of the steam separator was made for this and a static structural analysis was conducted using ANSYS^[14]. This study evaluated whether the membrane stress and membrane plus bending stress at the shell and nozzle cross-section satisfied the acceptance criteria of the ASME code at the nozzle bore where the maximum stress was occured due to the stress concentration, which was determined from the analysis results.

후속연구

4. The stress analysis, safety evaluation method, and actual applied case study of the steam separator in the HP EVA according to the ASME code presented in this study are expected to be utilized in the design verification process for similar devices. The fatigue evaluation of the steam separator under the transient operating conditions, which was not discussed in this study, will be presented in a future study.
The stress analysis, safety evaluation method, and actual applied case study of the steam separator in the HP EVA according to the ASME code presented in this study are expected to be utilized in the design verification process for similar devices. The fatigue evaluation of the steam separator under the transient operating conditions, which was not discussed in this study, will be presented in a future study.

참고문헌 (15)

Eriksen, V. R., Heat Recovery Steam Generator Technology, Woodhead Publishing, 2017.
ASME Boiler and Pressure Vessel Code Section VIII Division 2: Alternate Rules, Rules for Construction of Pressure Vessels, American Society of Mechanical Engineers, 2010.
EN 13445-3:2009, Unfired Pressure Vessels - Part 3: Design, European Committee for Standardization, 2009.
Volpi, G., Penati, M. and Silva, G., "Heat Recovery Steam Generators for Large Combined Cycle Plants (250 MWe GT Output): Experiences with Different Design Options and Promising Improvements by Once-through Technology Development," Proc. of Power Gen Europe 2005, Milan, 28-30 June, 2005.
Chong, C. H. and Song, J. I., "Stress Behaviors of Superheater Tubes under Load Change Operation in HRSG," Journal of the Korean Solar Energy Society, Vol. 28, No. 6, pp. 33-39, 2008.
Kim, J. B., Hwang, S. H. and Chung, J. C., "The CFD Analysis for the Fatigue Life Evaluation of HRSG Bumper," Proc. of KSME Autumn Conference, pp. 1280-1285, 2015.
Shin. Y. J., Choi, C. H., Lee, S. G. and Kim, J. H., "Fatigue CAE Analysis of a Rebar Bending Machine Roller," Journal of the Korean Society of Manufacturing Process Engineers, Vol. 14, No. 2, pp. 75-80, 2015.
Cho, S. J., Park, Y. J., Han, J. W. and Lee, G. H., "Fatigue Life Prediction of the Carrier of Slewing Reducer for Tower Crane," Journal of the Korean Society of Manufacturing Process Engineers, Vol. 14, No. 3, pp. 131-140, 2015.

원문보기 상세보기
Chong, C. H., Kim, H. G., Choi, Y. J., Lee, C. S. and Ha, J. W., "Design Life Analysis for HRSG," Proc. of KSME Autumn Conference, pp. 55-60, 2004.
Lee, B. Y., "Evaluation of Stress and Fatigue of High-Pressure Drum for Heat Recovery Steam Generator According to European Code," Transaction of the Korean Society of Mechanical Engineers A, To be published, Vol. 42, No. 9, 2018.
Lee, B. Y., "Evaluation of Safety of Corrosion Fatigue of High Pressure Drum for Heat Recovery Steam Generator Using Transient Thermal Stress Analysis," Journal of the Korean Society of Precision Engineering, To be published, Vol. 35, No. 10, 2018.
Lee, B. Y., "Evaluation of Stress and Fatigue Life of Tube Bundle and Header for High-Pressure Evaporator of Heat Recovery Steam Generator," Trans. KSME A, Submitted, 2018.
Lee, B. Y., "Stress and Fatigue Evaluation of Distributor for Heat Recovery Steam Generator in Combined Cycle Power Plant," Journal of the Korea Academia-Industrial Cooperation Society, Accepted, 2018.
ANSYS, ANSYS User's Manual Version 11, ANSYS Inc., 2007.
ASME Boiler and Pressure Vessel Code Section II Part D: Materials Properties, American Society of Mechanical Engineers, 2010.

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배열회수보일러 기수분리기의 응력해석 및 평가
Stress Analysis and Evaluation of Steam Separator of Heat Recovery Steam Generator (HRSG) 원문보기

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배열회수보일러 기수분리기의 응력해석 및 평가 Stress Analysis and Evaluation of Steam Separator of Heat Recovery Steam Generator (HRSG) 원문보기

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배열회수보일러 기수분리기의 응력해석 및 평가
Stress Analysis and Evaluation of Steam Separator of Heat Recovery Steam Generator (HRSG) 원문보기

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