独立C型液舱因其蒸发率低，成为LNG双燃料船型燃料舱较优的选择。船舶在航行的过程中会吸收一定的热量，可能会引起罐体压力超出，从而影响航行安全，并造成LNG浪费以及温室气体的排放。为模拟船舶营运中LNG燃料罐内部压力变化，建立了LNG燃料罐压力模拟计算模型，并引入气相导热系数以考虑LNG自由液面的热输入量。经验证该模型的计算结果较为合理，进一步利用该模型分析了罐内压力的影响因素。结果表明：燃料罐内LNG自由液面处的热传递不容忽视；气相导热系数与罐内LNG液体的装载量以及燃料罐的尺寸相关，随着燃料罐直径的增加，气相导热系数将逐渐减小。研究结果可为独立C型LNG燃料罐初期压力模拟计算提供借鉴。
Independent LNG Type-C tank has become a better choice for LNG dual-fuel ship because of its low evaporation rate. However the Type-C tank will absorb heat and the pressure may be exceeded during the ship navigation, which may affect navigation safety and cause LNG waste as well as greenhouse gas emissions. In order to simulate the pressure changes inside the LNG fuel tanks during ship operation, a pressure simulation calculation model was established, and the gas-phase thermal conductivity coefficient was introduced to take into account the heat through the free surface of LNG. The calculation results of the model are proved to be reasonable, and the influencing factors of the pressure simulation are further analyzed by the model. The results show that the heat flux through free surface is not negligible; the gas-phase thermal conductivity is related to the loading of LNG liquid in the tank and the size of the fuel tank, and decreases with the increase of the fuel tank diameter. The results of the study can provide a reference for the initial pressure simulation calculation of independent LNG Type-C fuel tank.
2025,47(24): 67-71 收稿日期：2025-3-12
DOI：10.3404/j.issn.1672-7649.2025.24.011
分类号：U664.1；U677.6
作者简介：周旭(1977-),男,高级工程师,研究方向为船舶总体设计
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