استفاده از بازدهي و كارايي اكسرژي در تبيين عملكرد پمپ حرارتي جذبي

Analysis of Fluid Flow in Transfer Line Exchanger of Steam Cracking Furnace

The purpose of this research is numerical study of fluid flow and temperature distribution in the transfer line exchanger (TLE) of thermal cracking furnace. That is used for cool out flow of thermal cracking reactors. The advantages of using these exchangers in industries are the low cost of separation, production of high pressure steam and high heat recovery from the cracked gas. Numerical solution of heat transfer and fluid flow can be done when governing laws on these processes have been explained by differential equations. Complex flow can be modeled by numerical methods of computational fluid dynamics (CFD), such as finite volume, without using additional approximations. The advantages of using computational fluid dynamics include diagnosis of flow, rapid evaluation of novel process route, energy efficiency and low cost design. For simulation of fluid flow and heat transfer in the heat exchanger, FLUENT software and k-e mode! for turbulent model are used. By investigation of turbulent models, it is observed that application of turbulent models with orders higher than 2 are not proper for modeling of heat exchangers. Simulation results were presented for temperature, pressure and velocity contours, which results show good agreement in comparison with experimental data.