The Optimization Research Of Separation Performance Of Assembled Adjustable Condensate Supersonic Dehydration Equipment

Natural gas purification process is an essential part before producing LNG and gathering,effectively removing water from natural gas can reduce the problems that pipeline is blocked by hydrate,and the acidic gas dissolved in free water so that pipeline and equipment are corroded.At the same time,gas quality is improved.Supersonic dehydrating device is one new gas-liquid separation facility,combining the turbine expansion machine and separator with supercharger function together,which has the advantages of low consumption,high efficiency,safety and no pollution etc.,but the domestic relevant theoretical research remains immature,it is still in the stage of optimizing and improving.This paper studied the basic principle and design method of supersonic dehydration unit,respectively completed three-dimensional design of the key parts of the Laval nozzle,swirler and a diffuser pipe by using Solidworks software.The convergent section of Laval nozzle is designed according to the quintic curve method.The throat pipe is designed the form of flat-angle and outer circle.The divergent section and the diffuser are design conical tube.The swirler is designed to the spiral screwing guide vane.The characteristic of the whole device is flange combination,and has the function to adjust the different geometrical parts easily.The experimental system of the combined adjustable condensate supersonic dehydration device of was studied,experimental system is divided into four parts,which are pressurization and gas supply system,water atomization system,low temperature separation system and parameter measuring system;planning the main content and methods of installation and commissioning;based on the characteristics of the function and structure of every system,setting the corresponding measuring points and measuring instruments;establishing a detailed experiment scheme and experiment process.According to the type line structures and flow field characteristics of the supersonic dehydrating device,the paper divided mesh to the different regions of the established physical model by using Gambit.The paper simulated the basic model of pre and post type supersonic dehydrating device by using the Fluent14.5 in earlier stage.On the foundation of basic model existing problems,the separation performance of supersonic dehydration device is optimized by changing the geometric parameters and operating conditions.In the later stage,the guide vane is placed on the front end of the Laval nozzle,and the corresponding optimization of the pre dewatering device is carried out by the contrast method.The results show that the post type dewatering device can provide a low temperature environment for droplets to be condensed,and have certain swirl separation ability.The pre dewatering device can maintain a low temperature environment,the shock loss of vane is weaker,but centrifugal strength is small than the post type dewatering device.