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Received January 19, 2022
Accepted February 9, 2022
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LNG 냉열 기반 해수 담수화 공정의 설계 및 분석
Design and Analysis of Desalination Process using LNG Cold Energy
숙명여자대학교 화공생명공학부, 04310 서울특별시 용산구 청파로 47길 100
Department of Chemical & Biological Engineering, Sookmyung Women’s University, Seoul, 04310, Korea
ktpark@sm.ac.kr
Korean Chemical Engineering Research, August 2022, 60(3), 371-376(6), 10.9713/kcer.2022.60.3.371 Epub 18 July 2022
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Abstract
액화 천연 가스는 도시가스로 공급되기 위해 기화의 과정을 거치는데 이 때 약 800 kJ/kg의 냉열이 발생한다. 현재 이 에너지는 모두 바다로 버려지고 있어 에너지 재순환 관점에서 보면 아주 심각한 에너지 낭비를 초래하고 있다. 본 연구에서는 이 점에 착안하여 버려지는 액화 천연 가스의 냉열을 활용할 수 있는 해수담수공정을 제안하고 이 공정을 최적화하여 고유 전력 소비와 경제성에 대해 분석하였다. 그 결과 제안된 공정의 에너지 소모량은 -5.2 kWh/m3, 담수 생산 단가는 0.148 USD/m3으로 계산되어 현재까지 개발된 어떤 공정보다도 우수함을 확인하였다.
Liquefied natural gas undergoes a process of vaporization to be supplied as city gas, which generates about 800 kJ/kg of cold energy. Currently, all of this cold energy is being dumped into the sea, resulting in a very serious energy waste from the point of view of energy recycling. In this study, a seawater desalination process that can utilize the wasted cold energy was proposed, and this process was optimized to analyze the specific power consumption and economic feasibility. As a result, the specific energy consumption of the proposed process was calculated as -5.2kWh/ m3, and the production cost of the pure water was 0.148 USD/m3, confirming that it is superior to any other process developed so far.
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Ligaray M, Kim N, Park S, Park JS, Park J, Kim Y, Cho KH, Chem. Eng. J., 395, 125082 (2020)
Park K, Kim DY, Jang YH, Kim M, Yang DR, Hong S, Water Res., 171, 115426 (2020)
Moharram NA, Bayoumi S, Hanafy AA, El-Maghlany WM, Case Stud. Therm. Eng., 23, 100807 (2021)
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He T, Nair SK, Babu P, Linga P, Karimi IA, Appl. Energy, 222, 13 (2018)
Chong ZR, He T, Babu P, Zheng J, Linga P, Desalination, 463, 69 (2019)
Koo J, Oh SR, Choi YU, Jung JH, Park K, Energies, 12, 1933 (2019)
Park K, Won W, J. Natural Gas Sci. Eng., 34, 958 (2016)
Remeljej C, Hoadley A, Energy, 31, 2005 (2006)
Akbari N, Appl. Therm. Eng., 140, 442 (2018)
Wade NM, Desalination, 136, 3 (2001)
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Wang Q, J. Membr. Sci., 14, 439 (2019)
Karagiannis IC, Soldatos PG, Desalination, 223, 448 (2008)
