Development And Theoretical Research On Double-inlet Cyclone Absorber

With the enhancement of people's awareness of environmental protection,the requirements for ecological environment quality are getting higher and higher.A large amount of exhaust gas is often generated in chemical production,and it needs purification treatment to meet environmental standards.The traditional wet washing equipment has low mass transfer rate and high purification cost,which can no longer meet the current higher environmental protection standards.In order to improve the purification effect of waste gas,a new double-inlet cyclone absorber was developed.Based on the analysis of the characteristics of flow field and droplet dynamics,the design theory of cyclone absorber and the calculation method of mass transfer rate are presented.The main work,results and conclusions of this paper are as follows:(1)The double-inlet cyclone absorber adopts the upper and lower tangential air intake pipes and the gas-liquid collision mixing technology,which greatly reduces the particle size of the droplets.Thereby improving the contact time and contact area of the gas-liquid two phases and improving the absorption efficiency.(2)The effects of the exhaust pipe insertion depth,exhaust pipe diameter and cone height on the swirl state were simulated.The results show that when the exhaust pipe insertion depth and the cylinder height are 1: 1,the rotation state of the air flow in the cylinder section is closest to the ideal free vortex.When the cone angle of the cone section is 18.5 °,the rotation form of the air flow in the cone section is closer to the ideal forced vortex.When the distance between the cylinder and the exhaust pipe is the same as the width of the intake pipe,the appearance of the vortex core can be avoided,and the structure size is optimal.(3)With the same inlet velocity and volume,the effective flow area of airflow in the double-inlet cyclone absorber increases,and the low-speed zone and the secondary vortex zone are reduced.So the contact area between gas and liquid is improved.At the same structure size and inlet velocity of 10m/s,the airflow movement time of the double-inlet cyclone absorber is 0.32 s,which is greater than0.23 s of the single inlet cyclone absorber,which improves the contact time between gas and liquid.(4)By analyzing the dynamic characteristics of the droplets,the velocity equations of the droplets in the axial and radial directions are obtained.Based on the distribution of airflow in the double-inlet cyclone absorber,the length of the droplet's movement in the axial and radial directions is solved,and the calculation method of the structure size of the double-inlet cyclone absorber is given.(5)Based on the surface renewal model of gas-liquid mass transfer,a calculation formula for the mass transfer rate in the cyclone absorber is proposed.The error between the mass transfer rate calculated by the formula and the experimental value is within 5.72% ? 10.22%,which verifies the accuracy of the calculation method in this paper.Comparing the theoretical value of the mass transfer rate of the double-inlet cyclone absorber with the experimental value of the mass transfer rate of the single inlet cyclone absorber,the results show that the growth rate of the mass transfer rate of the double-inlet cyclone absorber reaches 56.71%,which is theoretically verified the high efficiency of the double-inlet cyclone absorber.