再沸器单根换热管外围壳程流场沸腾传热的数值模拟  

Numerical Simulation of Flow Field Boiling Heat Transfer in the Shell Side of Single Heat Exchanger Tube of Reboiler

作　　者：刘长海[1] 杨博 张莹光 LIU Chang-hai;YANG Bo;ZHANG Ying-guang(College of Mechanical Science and Engineering,Northeast Petroleum University;Plastics Plant,PetroChina Daqing Petrochemical Company)

机构地区：[1]东北石油大学机械科学与工程学院 [2]中国石油大庆石化公司塑料厂

出　　处：《化工机械》2020年第2期187-191,235,共6页Chemical Engineering & Machinery

摘　　要：以再沸器中的换热管为研究对象,建立单根换热管外部壳程流体的三维有限元模型,采用描述沸腾的RPI模型对再沸器中单根换热管外部壳程流场的沸腾传热进行计算,得到不同边界条件对体积含气率与沸腾传热系数的影响。计算结果表明:气体体积含气率沿换热管中心轴线的流动方向逐渐增大;出口截面体积含气率与入口速度成负相关,与入口温度和热通量成正相关;沸腾传热系数与热通量、入口速度和入口温度成正相关。Through taking the heat transfer tube in the reboiler as the object of study,a three-dimensional finite element model was established for the outer shell fluid in a single heat transfer tube and the RPI model which describes the boiling status was used to calculate the boiling heat transfer of the outer shell flow field of the reboiler’s single heat exchange tube so as to obtain the effect of different boundary conditions on the volumetric gas content and boiling heat transfer coefficient.The calculation results showed that,the gas volume fraction increases gradually along the flow direction of the central axis of the heat exchange tube.The volume gas content of the outlet section is negatively correlated with the inlet velocity and positively correlated with the inlet temperature and heat flux,and the boiling heat transfer coefficient is positively correlated with heat flux,inlet velocity and inlet temperature.

关 键 词：再沸器 换热管 沸腾传热 体积含气率 传热系数 

分 类 号：TQ051.65[化学工程]