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발전소 씨스템의 에너지와 엑서지 수지식의 분석 및 yEXERGY프로그램 개발
Analysis of Energy and Exergy Balances of Power Plant Systems and the Development of yEXERGY Program
HWAHAK KONGHAK, April 1999, 37(2), 171-177(7), NONE
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Abstract
일반적인 발전소 씨스템의 공정으로 이용되는 증기-압축 싸이클의 효율을 열역학 제1법칙을 이용한 에너지 수지와 열역학 제2법칙을 이용한 엑서지 수지로 구한 후 그 결과를 서로 비교 · 분석하였다 엑서지를 이용하면 각 단위공정 내부의 비가역성에 의한 손실량을 알 수 있으며 손실량이 가장 많은 공정의 조작변수를 수정하여 전체 효율을 향상시킬 수 있다. 분석결과 에너지 수지로 분석하였을 경우 씨스템과 외계간의 에너지 변화량이 가장 많은, 즉 에너지 손실이 가장 많은 단위공정은 응축기였고, 엑서지 수지식으로 분석하였을 경우 고압 급수 가열기와 초급수 가열기의 합인 가열기의 엑서지 손실량이 가장 많았다. 이로부터 실제적인 공정 중의 에너지 손실을 줄이기 위해서는 가열기 공정을 변화시켜야함을 알 수 있었고, 위의 결과를 바탕으로 엑서지를 이용하여 발전소 씨스템을 분석할 수 있는 사용자 편리 프로그램인 yEXERGY를 개발하였다.
Abstract- This study focuses on the exergy and energy analysis of the general power plant system containing vapor-_x000D_
compressor cycles. As the result of the exergy analysis, the amount of irreversibility of the interior of each subsystem is computed and the efficiency of the total system is improved by optimizing manipulated variables of subsystems which include the most dominant exergy loss. The energy analysis based on the first law of thermodynamics shows that the condenser is the most dominant part of the energy loss. On the other hand, the exergy analysis based on the second law of thermodynamics shows that the boiler is optimized for reducing the energy loss in practice and improving the efficiency of the total power plant system. yEXERGY, a user friendly program, is also developed for the analysis of the general power plant system.
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Sussman MV, "Availability(Exergy) Analysis," Mulliken House, MA, 13 (1980)
de Nervers N, Chemtech, 12, 303 (1982)
Morgan MJ, Sciubba E, J. Eng. Gas Turbines Power, 116, 285 (1994)
Joo HS, Choi CK, Kim H, HWAHAK KONGHAK, 30(5), 537 (1992)
Smith JM, van Ness HC, "Introduction to Chemical Engineering Thermodynamics," 4th ed., McGraw-Hill, Singapore, 135 (1987)
Bidini G, Stecco SS, J. Eng. Gas Turbines Power, 113(Jan.), 145 (1991)
Reid RC, Prausnitz JM, Poling BE, "The Properties of Gases and Liquids," 4th ed.,McGraw-Hill, New York, 46 (1988)
Perz E, J. Eng. Gas Turbines Power, 113(April), 185 (1991)
Wi JH, Choi CK, Joo HS, Cho Y, Kim H, HWAHAK KONGHAK, 30(4), 406 (1992)
Ko D, Moon I, HWAHAK KONGHAK, 35(3), 338 (1997)
Hwang D, Oh M, Moon I, HWAHAK KONGHAK, 36(2), 151 (1998)
