Study On The Numerical Simulation, Optimization And Scale-Up Of Jet Reactor

Ejector is a mechanism which is used to transfer energy and mass through the turbulent dissipation. As a reactor, ejector can intensify mixing process, promote reaction process and improve the selectivity of reaction. Because of these merits, jet reactor is employed in all walks of industries. At present, the research on jet reactor at home and abroad mostly has focused on the characteristics of flow, but less work has been done on the reaction characteristics and scale-up laws. Understanding the flow field information of the jet reactor in details can help master the characteristics of jet reactor further and provide references for the optimization and scale-up of this equipment.At first, jet reactor was simulated with 3-D model in this paper with the help of computational fluid dynamics software CFX5. It offered much information about the inner flow field, pressure field and composition concentration field. The effects of configuration size on flow characteristics, resistance distribution and reaction behavior were analyzed in details. The configuration sizes include angle of diffuser section, the ratio of diameter between nozzle and mixing section, and also the position of nozzle. The results were as follows: (1) The smaller the angle of diffuser section is, the better mixing among flows in the equipment and the higher conversion rate in the same cross section can be achieved, but more kinetic energy will be consumed. (2) There is an optimum value for the ratio of diameter between nozzle and mixing section, namely 0.35. If the value is larger than 0.35, the conversion rate in the jet reactor will debase at the same cross section. While if the value is smaller than 0.35, it will consume more kinetic energy but can not improve conversion rate any more; (3) The further the distance between nozzle outlet and mixing section is, the faster the reaction proceed. The best reaction result can be obtained when the nozzle outlet shares the same plane with the center of suction inlet.Secondly, the scale-up effect of jet reactor was also studied in this paper, the...