LNG空温式气化器管束传热特性
Heat transfer performance of the fin tube bundle of LNG ambient air vaporizer

液化天然气（LNG）空温式气化器由翅片管管束组成，以节能环保的优势在LNG中小型气化站得到广泛应用。空温式气化器管束中的单根翅片管传热会受到相邻翅片管的影响，与大空间中的单根翅片管的传热过程存在差异，传统的传热设计中往往忽略管束中翅片管的传热差异，带来较大误差。针对空温式气化器管束传热特性展开研究，对涉及流固耦合传热问题的翅片管管束进行整场建模与求解，采用混合物模型和Lee模型求解管内LNG气化传热，得到了管束中不同位置翅片管的空气侧温度场分布及传热系数，建立了空气侧传热差异系数拟合公式，并用管束空气侧传热特性实验对拟合公式进行了验证。
LNG ambient air vaporizer (AAV) composed of fin tube bundle is widely used in small to medium gas stations due to its advantages in energy and economic savings. The heat transfer of the fin tube in the bundle is affected by the adjacent fin tube, which is different with the fin tube in the large space. The heat transfer difference of each fin tube in the bundle is generally neglected during the design process, which results in large error. The heat transfer performance of the fin tube bundle of AAV was investigated. The fluid solid coupled heat transfer of the fin tube bundle was numerically simulated integrally, and the mixture model and Lee model were used to solve the vaporization process of LNG. The heat transfer coefficients of the air side of the different fin tube in the bundle were obtained, and the formula of the heat transfer difference among the fin tube bundle was obtained based on the numerical results. A field test of the LNG ambient air vaporizer was carried out in a LNG gas terminal to validate the formula.