Study On The Spontaneous Condensation And Seperation Performance Of Moist Gas In Two-phase Vortex Tube

The supersonic condensation separating technology, a novel technology for mixed gas seperation, is the combination of the supersonic condensation and centrifugal separation. Using this technology, the separation system of the mix gas can be remarkably simplified, so it has good prospect to apply this technology in the field of Natural Gas purification and dehydration. However, so far the separation performance of the supersonic condensing separator is limited due to the excessively large axial velocity.The heavy component of the mix gas condenses while the mix gas expend through the vortex nozzle caused by the low temperature effect generated in this process. In addition, the axial velocity is much smaller than the tangential velocity, which is a great advantage comparing to the existing supersonic condensation separating technology. On the basis of above analysis, a new two-phase vortex separating technology has been proposed and some important numerical and experimental study results were presented.First of all, Different types of nozzles have been studied to find out the effect of the nozzle shape and flow passage on energy separation and suitable nozzle type for two-phase vortex tube has been obtained.Secondly, a three-dimensional model for two-phase two species supersonic condensation flow has been established for the prediction of the process of moist gas condensation in the supersonic flow. Euler-Euler governing equations have been employed for the two-phase flow with the classical nucleation model calculating the spontaneous condensation. The simulation tallies closely with the experiment. Furthermore, the model was applied to the simulation of the spontaneous condensation in two-phase vortex tube, and the effect of slenderness ratio, diffuser, pressure ratio and cold mass fraction on separation performance has been predicted.Finally, the experiment equipment was improved and separation characteristics of two-phase vortex tube were studied by conducted experiment. The effect of slenderness ratio, diffuser, pressure ratio and cold mass fraction on separation performance was analyzed and the result tallied with the simulation, which proved that this paper can provide theoretical and experimental basis for industry.