Research On The Flow Field Homogenization At Entrance And The Shell Structure Optimization Of The Shutter Baffle Heat Exchanger

Heat exchanger is widely used in the production process of oil industry and chemical industry, etc. Improving heat exchanger fluid flow homogeneity, changing and optimizing the structure of heat exchanger are important way of saving energy and reducing consumption.In this paper, on the basis of numerical simulation, the entity model has been used to study the homogeneity of inlet fluid in the conventional heat exchanger with variable cross-section guide cylinder device, And the better fluid flow state based on the inlet cross-section of heat exchanger of the guide cylinder device under the different geometric parameters are determined to the structure parameters of the variable cross-section guide cylinder. Results show that, for inlet fluid flow on the heat exchanger, selecting reasonable structure parameters has good homogenization effect. At the same time, It could effectively reduce the pressure drop of heat exchanger shell.The variable cross-section guide cylinder has been loaded into the shutter baffles heat exchanger, the flow characteristic in the shell side of heat exchanger with guide cylinder device before and after has been studied by FLUENT. Comparison of the pressure drop on the shell side and homogeneity of the fluid on the inlet section of the shutter baffles heat exchanger before and after the installation of variable cross-section guide cylinder device. Through comparative analysis, it proved that the variable cross-section draft tube device has good flow properties for the shutter baffles heat exchanger, and it can significantly reduce the pressure drop of shell side.By adjusting the rod-baffle pitch, the angle and the width of baffling, and establishing the calculation model, the fluid flow properties and heat transfer characteristics on the shell of shutter baffles heat exchanger is found under the different structural parameters. And contrast to the conventional shutter baffles heat exchanger, the structure parameters of heat exchanger are obtained when the internal heat transfer state is optimized, which provide a reference for the further improvement structure of shell of the conventional shutter baffles heat exchanger. In order to prove the numerical simulation results and methods are correct which are used in the paper, and research on its flow characteristics of the fluid flow field, the experimental device base on the shutter baffles heat exchanger are manufactured. The results show that, under the same set of parameters and operating conditions, the numerical simulation results and experimental results of the heat exchanger are in good agreement.