Simulation Study On Flow Characteristics In Cyclone Separator With Guide Tube

Cyclone separators use airflow to rotate particles to meet the purpose of gas-solid separation due to centrifugal force and wall collisions.Because of their simple structure,stable performance,and high separation efficiency,they are widely used in petrochemical industries.Researches by scholars have shown that the regulation of the flow field in the ash bucket is beneficial to achieve the goal of "high efficiency and low resistance" of the cyclone separator with ash bucket structure.In this paper,a ash hopper cyclone with a guide tube structure is designed to use the existing pressure difference to guide the ash hopper into the ash hopper to achieve the blasting effect of the hopper.The numerical simulation method is used to study the main work content and conclusions are as follows :The flow field in the standard Stairmand cyclone was analyzed in detail by numerical simulation method,and compared with the experimental results,the feasibility of the numerical simulation method and the accuracy of the model were verified.Based on the standard Stairmand cyclone separator,two types of diversion pipes are designed.The distribution and separation performance of the internal flow field are numerically calculated.The result obtained is,when the inlet air velocity is 16.1m/s,the cyclone with diversion tube can strengthen the stability of the flow field distribution in the ash bucket,reduce the occurrence of secondary vortexes,and improve the separation efficiency of particles smaller than 5?m in size.The highest rate is 7%.In addition,the working pressure drop of the H-E type cyclone separator is about 15% lower than that of the standard Stairmand type cyclone separator.It shows that the cyclone with diversion tube can effectively improve the ability of the cyclone to separate and collect small particles,and achieve the purpose of "high efficiency and low resistance".The parameters of flow field distribution,pressure drop and separation efficiency of the cyclone separator with guide tube under different diameters of the flow tube were compared,and the particle concentration distribution in the separator space was analyzed.The results show that when the diameter of the diversion tube is 30 mm,the separation performance of the cyclone with the diversion tube is the best.On the basis of the above research,a double-tube cyclone separator was designed and numerically calculated,and the calculation results were compared with the standard Stairmand cyclone separator.The results show that the double-tube cyclone separator improves the symmetry of the static pressure distribution in the ash bucket,weakens the secondary vortex effect,and reduces the working pressure drop by about 17%.It shows that the double-tube cyclone separator can combine the advantages of two types of cyclone with diversion tubes,and the ability to separate small particles is enhanced.