Research On The Influence Of Scaling In Vacuum Heating Furnace Tube On Heat Exchange Efficiency

In the petroleum and petrochemical industry,heating furnace is a widely used,and in the gathering and transportation process of oil and gas,the heating furnace plays a pivotal role.Vacuum heating furnace has the advantages of low cost,high efficiency and high automation,and it is widely used in oil field.After years of development,vacuum heating furnace has been gradually improved both in the design and in the application.At the same time,the research of different parts of vacuum heating furnace has been carried out,and as a significant heat exchanger,the furnace tube is easy to scale in the process of operation,and the scale affects the overall heat transfer efficiency.In view of this,the scaled furnace tube is the research object and related numerical simulation work is carried out in this paper.The heat transfer media containing impurities usually result in the scaling of the furnace tube,which leads to the increase of heat resistance and heat transfer performance.In order to reasonably analyze the influence of the scaling in heating furnace tube on the mechanical properties of the furnace,this paper is based on the theory of heat transfer coupling and applies various finite element analysis software considering the comprehensive effects of heat-fluid-solid fields,and then makes the numerical simulation and analysis of vacuum heating furnace tube and its scale.The results show that the surface heat transfer coefficient and the furnace tube heat transfer performance decrease with the increase of the value of thickness,area and inlet velocity of the scale,however,when they reach a certain extent,the influence weaken gradually,and the material of tube can affect the total heat flux.The results of this study can be used to describe the mechanical properties of furnace tube and its scale,and it provides a scientific method for the reasonable use and heat exchange efficiency evaluation of vacuum heating furnace.In addition,this method can also be applied to other devices of petroleum and petrochemical industry.