| Triethylene glycol solvent absorption method is widely used in the field of natural gas dehydration,but due to the large volume of the whole natural gas dewatering and prying system,it is difficult to flexibly adapt to the offshore natural gas exploitation platform.In view of this,process strengthening equipment for obtaining compact natural gas dehydration system has gradually become the research direction in this field.In this thesis,the specific surface area of gas-liquid two-phase contact is taken as the design idea for the tubular contact absorber applied in natural gas dehydration system,and the atomization mixing mechanism and characteristics of gas-liquid jet in tubular space are studied under laboratory conditions based on the phenomenon of liquid injected into moving air crossflow.Based on the experimental research,high speed photography is used to study the morphological characteristics of liquid jet breakup in flowing air crossflow and Phase-Doppler anemometry(PDA)is employed to measure the atomization droplet characteristics in this thesis.In order to obtain the liquid jet breakup penetration trajectory,the image processing method of liquid jet penetration trajectory based on MATLAB is proposed.Based on the droplet size information measured by PDA,a reasonable cumulative percentage threshold is used to filter the droplet size in order to avoid the influence of marginally large droplet size on the overall Sauter mean diameter(SMD).characteristic particle sizeIn the space of finite uniform section,the liquid jet column undergoes the bending,deformation and breakup,from which the jet column is broken into large liquid block for the first time to small liquid droplets for the second time.According to the empirical model diagram of liquid jet breakup based on Weg and Wej obtained from the experiment,it can be seen that there are three typical breakup modes of liquid jet breakup:Bump breakup,Arcade breakup and Bag breakup,and breakup mode is more sensitive to the change of Weg.Obvious transition boundary between different breakup modes is found.There is a turning point Wegc,the droplet size along the liquid jet direction will change from an oblique-I-type distribution to a C-type distribution with the increase of the Weg,and the obtained atomized droplet velocity is positively correlated with the WegIn order to obtain more micro droplets,a variable section flow channel structure is proposed.Combined with numerical simulation,the single-factor structural parameter selection of variable section flow channel structure shows that the structure of internal cone block in diamond,shorter length of equal diameter section and smaller expansion angle are conducive to liquid jet breakup and increase effective liquid atomization amount.Under different the Weg,the liquid jet breakup is Bag breakup and severe Bag breakup,and the crushing degree is severe,resulting in smaller droplets distributed in the moving airflow.A tubular gas-liquid contact absorber for natural gas dehydration is proposed based on the experimental results of variable section channel structure.Under laboratory conditions,the SMD characteristic particle size of the stable atomization field measured by the tubular gas-liquid contact absorber is around 20 ?m,and the effective atomization volume increases,which is evenly distributed along the direction of the jet,which is of great significance for the next research.In this thesis,the internal gas-liquid atomization mixing mechanism of the tubular gas-liquid contact absorber applied in natural gas dehydration process was investigated experimentally,and some research results were obtained,which provided a good basis for further clarifying the design principle and atomization mechanism of the tubular gas-liquid contact absorber... |
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