| The existence of water and liquid hydrocarbon will have negative impact on natural gas gathering and processing,therefore,natural gas dehydration and de-hydrocarbon must be part of the natural gas process.Currently,natural gas dehydration and de-hydrocarbon methods mainly include absorption,adsorption and low temperature separation,these traditional methods of dehydration and de-hydrocarbon are often have problems of complex technology,multi-facility and heavy investment.Originated from aviation technology,supersonic dehydration and de-hydrocarbon technology shows several advantages,including simple device structure and process,small size,low energy consumption,high separating efficiency and strong adaptability to natural gas imported conditions,thus can get rid of those limitations of traditional methods.Therefore,supersonic dehydration and de-hydrocarbon technology has potential and extensive application prospects of natural gas processing.According to the practical natural gas dehydration and de-hydrocarbon requirement,this thesis investigated the basic infrastructure of convergent section,expansion section and separation section in supersonic nozzle.Referring to wind tunnel design,this thesis improved the basic structure of nozzle expansion section,focused on eliminating expansion wave generated in the nozzle during acceleration of supersonic airflow.Based on the basic theory of CFD,the author built the three-dimensional physical model of GWF by using analysis software COMSOL Multiphysics,given reasonable network segmentation and boundary setting condition,selected the appropriate model and solution methods,focused on the field simulation analysis of 8 selected species supersonic nozzle parting surface,by analyzing the influence of natural gas inlet temperature,pressure and throughput on nozzle flow field,eventually obtained the optimum structure of supersonic nozzle.On the basis of analyzing natural gas condensation model in supersonic flow field,this thesis was given the integral flow field simulation and analysis of GWF,discussed influence rules of gas condensation on nozzle flow field,analyzed the influence rules of droplet nucleation rate and separator structure on separation performance,obtained the optimum separator structure parameter,and analyzed the impact of natural gas import parameters on separation performance.In the meanwhile,this thesis predicted and contrasted the natural gas dehydration and de-hydrocarbon effect of improved GWF and widely-used industrial GWF performance,which indicated that after the improvement of GWF expansion section could get more reasonable temperature and pressure and liquid hydrocarbon,etc.. |
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