Numerical analysis of LNG vaporizer heat transfer characteristic in LNG fuel ship
摘要
Abstract: The heat transfer characteristics of LNG(Liquefied Natural Gas) vaporizer on the ship was per-formed by numerical simulation to get the optimum NG(Natural Gas) generating condition. The gly-col-water was used for heating in LNG vaporizer, and the cooling water of main engine was used as heating souse for glycol-water. This cooling water temperature increases again after recirculating from the main engine, and then it can be used to heat the glycol-water. The numerical analysis results has good agreement with the experimental results by liquid nitrogen for validation. So CFD technique was used to simulate the heat transfer characteristics of LNG vaporizer on the ship. The numerical results show that the operation condition of LNG vaporizer shows NG temperature of 6℃ in the outlet of LNG vaporizer, and the mass flow rates of LNG and glycol-water were showed 0.111 kg/s and 1.805 kg/s, respectively. Keywords: LNG, CFD, Vaporizer, Heat transfer, Phase change. 서 론 액화 천연가스는 깨끗한 에너지 자원 중 하나이다. 타 연료에 비해 열효율이 높고 냉난방은 물론 자동차, 유리, 전자, 섬유 및 금속처리 산업 등에 다양하게 이용되는 연료이다. 천연가스는 한번에 많은 양을 운송하기 위해 대기압에서 111K로 냉각시켜 부피가 1/600