The trans-critical heat transfer characteristics of LNG in a submerged combustion vaporizer under different operating pressures
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The trans-critical heat transfer characteristics of LNG in a submerged combustion vaporizer under different operating pressures

机译：不同操作压力下浸没式燃烧蒸发器中LNG的跨界传热特性

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Highlights?The tube side heat transfer process in a submerged combustion vaporizer was studied.?The trans-critical vaporization characteristics of LNG were numerically analyzed.?Temperature response together with the heat flux along the tube were investigated.?The range and position of trans-critical region were affected by operating pressure.?The local heat transfer coefficient differed a lot under different operating pressures.AbstractIt has been reported that trans-critical LNG vaporization process always occurs on the tube-side of typical submerged combustion vaporizer (SCV). In-depth analysis of this complex physical process is crucial for the stable operation of efficient SCV. In the present paper, a three-dimensional CFD numerical model was developed to analyze the flow and heat transfer characteristics of trans-critical LNG in the horizontal tube. Based on the numerical simulation results, the velocity, temperature and heat flux along the tube length were obtained. The distributions of local heat transfer coefficients under different operating pressures were also analyzed. The calculated results displayed that the representative phenomenon of “flow acceleration” occurs inside the horizontal serpentine tube. Affected by the variation of the physical properties, the heat transfer coefficient under the lower operating pressure was higher around pseudo-critical region, but decreased lower in the later field. Totally, the higher operating pressure may bring faster temperature rising and lower energy expenditure to reach the similar outlet temperature.]]>
机译：<！[cdata [ 亮点 ？ 研究了浸没式燃烧蒸发器中的管侧传热过程。 ？ 跨临界汽化LNG的特征在数值上分析。 ？ 温度响应与管沿管的热通量一起进行。 < CE：标签>？ Trans-C的范围和位置归属区域受到操作压力的影响。 ？ 在不同的操作压力下局部传热系数不同。 抽象 据报道，始终是跨关键的LNG汽化过程发生在典型的浸没式燃烧蒸发器（SCV）的管侧。对该复杂物理过程的深度分析对于高效SCV的稳定运行至关重要。在本文中，开发了一种三维CFD数值模型以分析水平管中的跨界LNG的流量和传热特性。基于数值模拟结果，获得了沿管长度的速度，温度和热通量。还分析了不同操作压力下局部传热系数的分布。计算结果显示，“流动加速”的代表现象发生在水平蛇纹石管内。受物理性质的变化影响，在较低的工作压力下的传热系数围绕伪关键区域较高，但在后面的场中降低。完全，较高的工作压力可能会带来更快的温度上升和较低的能量消耗以达到类似的出口温度。 ]]>

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