Research And Development Of Double-cylinder Cyclone Absorber

With the development of the economy,a large number of polluted gases have been produced by burning fossil fuels.The massive emission of SO₂ destroys the ecological environment and endangers human health;the massive emission of CO₂ exacerbates global warming.In order to improve the treatment of SO₂,CO₂ and other gases,double-cylinder cyclone absorber is proposed.Based on the characteristics of swirling to enhance mass transfer,the contact time and contact area of the gas-liquid two phases are improved by properly setting the inner cylinder diameter and the nozzle,the mass transfer of the gas-liquid phase is promoted.In this paper,double-cylinder cyclone absorber was studied by structural design,numerical simulation and experiment.The main contents included:Combining the design method of the traditional cyclone and the features of the double-cylinder cyclone absorber,the structure of the device was designed,and the preliminary structural parameters were obtained.Reynolds stress model provided by ANSYS Fluent was used to simulate the flow field of the new gas absorption device.The results showed that the airflow in both internal and external space had a stable swirl flow,and the flow field was dominated by tangential velocity.Secondary flow phenomenon occurred in the outer space,which had a certain effect on the flow field.The pressure of the flow field was dominated by static pressure,and the distribution form was"V"shape.The pressure gradient in the inner cylinder changed rapidly,which was an important source of energy loss.The discrete phase model tracking droplets study showed that the distribution of the inner and outer droplets was uniform,and the gas-liquid contact effect was good.The structure was optimized by studying the influence of the diameter of the inner cylinder,the type of inlet,and the diameter of the exhaust pipe on the flow field of the device.The results showed that,when the inner cylinder diameter was 200mm,double volute inlet,and the exhaust pipe diameter was 100 mm,these parameters could keep good liquid dispersion with weak secondary flow and low pressure drop.So good gas-liquid contact in swirl field could be achieved in a low energy consumption condition,which could make the device perform best.Took the double-cylinder cyclone absorber as the experimental object,NaOH and Na₂CO₃ as absorbent,SO₂ as the target gas.The result showed that,for different absorbents,the absorption efficiency increased with the increase of the absorbent flow.NaOH absorbent had the better efficiency,reaching 96%.The absorption efficiency decreased with the increase of the inlet concentration.the absorption effect of Na₂CO₃solution was slightly lower than that of NaOH solution,but the absorption efficiency of both was above 94%under the experimental conditions.Under the condition of the maximum absorbent flux and the maximum inlet concentration,the export concentration met the national standard.The experiment proved that the device had a good absorption effect.