Design Optimization Of Micro Separator For Dry Gas Seal

At present,most of the domestic large-scale compressors use dry gas sealing system to achieve shaft end sealing.The dry gas comes from the outlet gas of the compressor,and it needs to rely on the filter element to remove the impurities.However,due to the limited liquid capacity of the filter element for dry gas sealing,frequent replacement is required in extreme cases,resulting in abnormal shutdown of the compressor unit.Therefore,it is necessary to connect a micro axial flow cyclone(AFC)in series before the dry gas seal filter element to pre-separate impurities in the air flow,reduce the processing load of the dry gas seal,and prolong the service life of the dry gas seal filter element.In the early stage of the laboratory,a two-stage axial flow cyclone was designed in series before the dry gas sealing filter element to pre-separate impurities.The previous research results show that the designed two-stage axial flow cyclone has the disadvantages of high pressure drop and low separation efficiency.Therefore,this paper adopts the method of combining numerical simulation and experiment to carry out the structural optimization and performance research of the two-stage axial flow cyclone separator,and the following research results are obtained:(1)The influence of the structural parameters of the guide vanes on the separation performance of the two-stage axial flow cyclone separator is more complicated.Therefore,it is necessary to explore its influence on the separation performance of the single-stage axial flow cyclone separator,and then explore its influence on the separation performance of the two-stage axial flow cyclone separator.It is found that when the angle of the guide vane is increased and the outlet angle is reduced,the separation efficiency and pressure drop are increased.(2)By studying the effect of adding anti-backmixing cone and changing the structural parameters of the exhaust pipe on the separation performance of the dual-stage axial flow cyclone,a dual-stage axial flow cyclone suitable for dry gas sealing is optimized and obtained.It was found that the addition of the anti-backmixing cone resulted in an increase in separation efficiency and pressure drop,and when the diameter of the exhaust pipe was increased,the insertion depth of the exhaust pipe was decreased,and the slit was made at the position of the tapered exhaust pipe,the separation efficiency increased and the pressure drop reduced.(3)The effects of gas pressure,inlet gas flow and droplet mass concentration on the separation performance of the optimized two-stage once-through separator were studied through numerical simulation and experiments.It was found that the increase of gas pressure and inlet gas flow would lead to an increase in separation efficiency and pressure drop.while the increase in droplet mass concentration will lead to a decrease in separation efficiency and an increase in pressure drop.