基于流路设计的斜隔板引流喷射换热器研究

Heat Exchanger with Inclined Plate and High-Pressure Spray Based on Flow Field Design

为提高原油加热等壳程蒸汽冷凝换热工况的换热效果,本文基于流路设计提出了一种斜隔板层间引流喷射型换热器,并采用数值模拟方法进行分析.分别探究了斜隔板倾角、进口流速、层间引流喷射、换热单元层数对换热性能的影响,获得了换热器综合性能(JF因子)与倾斜角、进口流速的经验关联式.结果表明:壳程斜隔板结构能够提高换热器的JF因子,且倾斜角和进口流速的适当增大有利于换热器性能的提高;多段引流喷射能利用进料气引流上一层的乏汽,提高上层乏汽热品位;斜隔板引流喷射结构放大效应小,有利于工业生产.

In this study,a heat exchanger with inclined plate and high-pressure spray is proposed based on flow field design to improve the beat transfer performance of steam condensation in shell side in such conditions as heating the crude oil.The heat transfer process within the heat exchanger was simulated by applying computational fluid dynamics(CFD)technique.The effect of inclination angle,inlet velocity,high-pressure spray,and number of layers on the heat transfer performance was tested,respectively.Empirical equations that reveal the function relationship between the heat transfer performance(JF factor)and inclination angle as well as inlet velocity were obtained.Results show that the inclined plate can enhance the heat transfer performance,which improves with the increasing of inclination angle degree and inlet velocity.The high-pressure spray can drain the dead stream from the upper layer and increase its quality.The new structure shows little scale effect,which is conducive to industrial production.