LNG空温式气化器管内气化传热与流型数值模拟
发布时间：2019-04-26 08:34
【摘要】：LNG空温式气化器是气化站内的核心设备,其管内气化传热特性对于设计与运行优化具有重要意义。以实际运行中的空温式气化器单根翅片管为原型,运用计算流体力学软件Fluent,采用VOF(Volume of Fluid)多相流模型及Lee冷凝相变模型,对LNG管内气化传热与流型进行了数值研究。结果表明:LNG在空温式气化器内气化的主要流型为泡状流、弹状流、搅拌状流及雾状流,且与Hewitt和Roberts流型图吻合较好;在LNG管内气化过程中,随着气相体积分数的增大,局部传热系数呈先增大后减小的趋势;管内局部传热系数随着壁面加热热流密度的增大而升高,LNG在空温式气化器内的气化传热以核态沸腾传热为主。
[Abstract]:The LNG air-temperature vaporizer is the core equipment in the gasification station, and its heat transfer characteristics in the tube gasification are of great significance for the design and operation optimization. Based on the single finned tube of air-temperature vaporizer in actual operation, the heat transfer and flow pattern of LNG tube gasification were numerically studied by using VOF (Volume of Fluid) multiphase flow model and Lee condensation phase transition model using computational fluid dynamics software Fluent,. The results show that the main flow patterns of LNG gasification in the air-temperature gasifier are bubble flow, slug flow, agitated flow and fog flow, which are in good agreement with Hewitt and Roberts flow patterns. In the gasification process of LNG tube, the local heat transfer coefficient increases first and then decreases with the increase of the volume fraction of gas phase. The local heat transfer coefficient of the tube increases with the increase of wall heating heat flux, and the gasification heat transfer of LNG in the air-temperature gasifier is dominated by nucleate boiling heat transfer.
【作者单位】： 哈尔滨工业大学市政环境工程学院;
【分类号】：TE96
本文编号：2465918
[Abstract]:The LNG air-temperature vaporizer is the core equipment in the gasification station, and its heat transfer characteristics in the tube gasification are of great significance for the design and operation optimization. Based on the single finned tube of air-temperature vaporizer in actual operation, the heat transfer and flow pattern of LNG tube gasification were numerically studied by using VOF (Volume of Fluid) multiphase flow model and Lee condensation phase transition model using computational fluid dynamics software Fluent,. The results show that the main flow patterns of LNG gasification in the air-temperature gasifier are bubble flow, slug flow, agitated flow and fog flow, which are in good agreement with Hewitt and Roberts flow patterns. In the gasification process of LNG tube, the local heat transfer coefficient increases first and then decreases with the increase of the volume fraction of gas phase. The local heat transfer coefficient of the tube increases with the increase of wall heating heat flux, and the gasification heat transfer of LNG in the air-temperature gasifier is dominated by nucleate boiling heat transfer.
【作者单位】： 哈尔滨工业大学市政环境工程学院;
【分类号】：TE96
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