Flow Field Analyses And Structure Optimization Of Gas-liquid-solid Three-phase Separation Hydrocyclone

Multiphase separation technology, including filtration separation, inertia separation, sedimentation separation and centrifugal separation, was introduced in the paper. And their separation principle, separation characteristics and current situation were analyzed. Hydrocyclone separation technique was mainly studied, and flow field, force in discrete phase, influence of structure parameter on separation, application and limitation was done. Advantage of three-phase separation hydrocyclone, separating three-phase mixture fluid in confined spaces, was introduced and current situation was concluded. A gas-liquid-solid three-phase hydrocyclone was designed based on a design ideal which is integration hydrocyclone in series. Concrete design ideal is connecting a gas-liquid hydrocyclone with a solid-liquid hydrocyclone, by structure improving an integrated hydrocyclone was formed. The geometrical model of a three-phase separation hydrocyclone was formed, and the grid size sensitivity was performed using NX UG and a computational fluid dynamics software FLUENT. Modeling scheme was determined and model was achieved. Structure parameter of hydrocyclone was divided into two parts, and two orthogonal tables were designed to structure optimization as a result of too much structure parameter of a three-phase separation hydrocyclone. Influencing degree and rules of geometric parameters, include length of degassing cylinder segment, cone angle of degassing cone segment, insertion length of gas-phase overflow pipe, area of gas-phase overflow outlet, rise angle of double-spiral channel, cross sectional area of double-spiral channel, length of desanding cylinder segment, cone angle of desanding cone segments, insertion length of liquid-phase overflow pipe and area of liquid-phase overflow outlet, on the separation efficiency were studied based on the orthogonal table. Gas phase volume fraction distributionsTsolid phase volume fraction distributions, pressure distributions and velocity distributions were studied by contrast original structure and optimized structure. Working principle, experiment procedure and main experiment equipment of PIV were introduced. Signal water was selected in for PIV and validity of the method was verified by numerical simulation. PIV experiment about gas-liquid-solid three-phase hydrocyclone designed based on results of numerical simulation was carried. Velocity distributions, circulation flow, internal swirl and external swirl were studied by the experiment.Experimental scheme and experimental system was introduced. Effect of insertion length of gas-phase overflow pipe, cone angle of degassing cone segment, inlet flowrate, Gas-phase overflow split ratio and underflow on gas-phase and solid-phase separation efficiency and liquid-phase overflow outlet pressure drop is analyzed based on joint action of experimental and numerical simulation of a gas-liquid-solid three-phase hydrocyclone.