화학공학소재연구정보센터
Korean Chemical Engineering Research, Vol.60, No.3, 371-376, August, 2022
LNG 냉열 기반 해수 담수화 공정의 설계 및 분석
Design and Analysis of Desalination Process using LNG Cold Energy
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초록
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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