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냉각수 열 교환기 망을 흐르는 냉각수 유량의 조절

Manipulation of Cooling Water Flow Rates in a Cooling Water Heat Exchangers Network

김진경 이경범¹ 이범석^†

Jin-Kyeong Kim Gyeongbeom Yi¹ Bomsock Lee^†

경희대학교 화학공학과, 449-701 용인시 기흥읍 서천리 1번지 ¹부경대학교 화학공학과, 608-739 부산시 남구 용당동 산 100

Department of Chemical Engineering, Kyunghee University, Seocheonli 1, Giheung-eup, Yongin 449-701, Korea ¹Department of Chemical Engineering, Pukyung University, San 100, Yongdang-dong, Nam-gu, Busan 608-739, Korea

bslee@khu.ac.kr

HWAHAK KONGHAK, April 2003, 41(2), 167-173(7), NONE

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Abstract

실제 화학공장 및 정유 공장에서 사용되는 냉각수 열 교환기들은 하나의 거대한 열 교환기 망에 연결되어 있으며 열 교환기에 공급되는 냉각수의 유량은 각각의 열 교환기 후미에 있는 밸브의 닫힘 정도에 의해서 조절된다. 모든 열 교환기는 하나의 망에 연결되어 냉각수를 공급받기 때문에, 하나의 열 교환기를 흐르는 냉각수의 유량을 조절하기 위하여 밸브를 조절할 경우, 열 교환기 망에 연결된 다른 모든 열 교환기로 흐르는 냉각수의 유량이 영향을 받게 된다. 본 연구에서는 열 교환기 망내의 모든 열 교환기에 흐르는 냉각수 유량을 동시에 고려하여 각 열 교환기에서의 냉각수 유량을 분석하고 원하는 유량으로 조절하는 최적화 방법을 개발하였다. 각 열 교환기에 요구되는 냉각수 요구 유량을 만족시키는 최적의 밸브 닫힘 정도를 결정하기 위하여 비선형 최적화 모델을 만들었으며, 모델의 최적화 해를 구하기 위하여 최적화 상용 프로그램인 GAMS/MINOS를 사용하였다.

In a large, complex cooling water heat exchangers network, cooling water flow rates are manipulated by adjusting the valves located at the rear of each heat exchanger. Since the heat exchangers are connected to a network, the manipulation of the cooling water flow rate in a heat exchanger by adjusting the valve results in the changes of the cooling water flow rates in the other heat exchangers. Therefore, the manipulation techniques of cooling water flow rates in a cooling water heat exchangers network are required in order to operate the cooling water networks efficiently. This paper presents the analysis and the manipulation method of the cooling water flow rates in all heat exchangers in a network simultaneously. A nonlinear programming(_x000D_ NLP) formulation is proposed to determine the optimal adjustment of the valves for the required flow rates of the cooling water in the heat exchangers. Solution of this formulation is obtained with a commercial NLP solver (GAMS/MINOS).

Keywords

GAMS/MINOS Optimization Heat Exchanger Network Cooling Water Flow Rates

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