Research Of The Two-phase Nozzle Applied In The Rotary Turbine Separator

Rotating turbine separator is a new foreign oil and gas treatment plant which is development recently. Because of its novel design concepts and unique practical function, Rotary Turbine Separator has been widespread concern, but is still in the development and testing stage, there are some Key issues have not yet been resolved. Two-phase nozzle as the core component of the rotating turbine separator, the two-phase nozzle is the role of the low speed of the flow of high pressure into a high-energy of low-pressure mixture fluid. Two-phase nozzle directly determine the level of performance of the rotating turbine separator .The performance and functionality can be achieved.The two-phase nozzle flow parameters of the analysis, design and test research is detailed, systematic studied from both theoretical and experimental field. This paper studies are as follows:Firstly, according to two-phase flow of gas-liquid and gas nozzle flow theory,a two-phase nozzle flow model-two-phase nozzle coupled model was built. This model considers the role of drag (momentum transfer), the heat transfer effects and impact of droplets rupture. Using this model the impact on the flow of two-phase nozzle flow parameters and performance is analysed. Drag coefficient, heat transfer coefficient and Weber number on the nozzle flow characteristics have great impact.According to this paper, two-phase coupled model and other models design four different nozzles, and research these nozzles through a non-working condition study and experiment. These studies prove that the two-phase nozzle coupling model is applied to the nozzle design of the two-phase feasibility and reliability. Finally, the application of the two-phase rotating turbine nozzle separator prototype was tested and further proved that the two-phase nozzle design method is feasible and applicable. The two-phase coupled model design of the nozzle is superior to other three methods.Pitot tube is used to measure the total pressure of jet and the two-phase Mach number of the nozzle exit is calculated, then the gas velosity of nozzle exit is calculated . Through the comparison between theoretical calculation of the velosity of gas and test result ,when the amount of liquid is small ,the result measured through Pitot tube measured is greater different from theoretical resolution values.The main requirement of the two-phase nozzle in the rotating turbine separator is the kinetic energy produced as much as possible, so the efficiency becomes the main parameters to measure the performance of two-phase nozzle . The two-phase nozzle efficiency with liquid mass flow increases after the first decrease. Because of the drag role of the momentum transfer between the gas-liquid the kinetic energy conversion capability reduces; efficiency reduces with mass flow increases;but droplets in the nozzle flow, as a heat source, compensates part of the energy due to the expansion of gases such as entropy arising from the lower temperature,so with the amount of liquid to further increase the droplets heat enhance the role of the capacity expansion of the gas, the nozzle efficiency increased.