The Design And Numerrical Simulation Of Tubular Gas-liquid Separation Device

With the exploitation of petroleum resources in recent decades,the exploitation of oil and gas resources on land has entered a hard period.The reserves are decreasing and the exploiting environment is deteriorating.There are large ocean resources in our country,especially in South China Sea.The development of oil and gas resources of ocean has far-reaching significance.The development of ocean oil and gas resources is now facing with a series of problems such as limited operating space.It is urgent to reduce the cost of new construction and maintenance,and improve the compactness of the equipment on the premise of ensuring the performance.The tubular gas liquid separation equipment with above advantages has become the main trend of research in recent years,but it has not formed a unified design specification.Similar equipment has been applied in industry abroad,but domestic related fields are still in the exploratory stage.The research content of this paper mainly includes two parts.First,on the basis of referring to the related data at home and abroad,to design the preliminary structural of tubular degasser.We analyzed the distribution characteristics of two phase,velocity and pressure by the use of simulation software FLUENT.Then the influence of structural parameters and running parameters on its separation efficiency and pressure drop loss was analyzed.Second,on the basic study of the inline deliquidiser in the earlier period of research group,an indoor experimental study of the inline deliquidiser with white oil and air as medium was carried out,which was close to the actual working condition.Then we compared the results with earlier experimental results.It was found that the separation efficiency of the tubular degasser increased first and then decreased when the number of blades increased,and the pressure drop loss increased with the increase of the number of blades,and the separation efficiency and pressure drop loss increased with the increase of the number of blades.The best combination of parameters was 12 leaves and 30 degrees of exit angle.The separation efficiency increased with the increase of the inlet velocity,the pressure drop loss increases with the increase of the inlet velocity,and presented a slow increase first and then a large increase.The separation efficiency increased rapidly with the increase of the bubble size first,and maintained a high separation efficiency after 40?m.The designed tubular degasser didn't show obvious separation efficiency for bubble size smaller than 40?m,especially the bubble size below 10?m.The correlation between the pressure drop loss and the bubble size was not obvious.Under the same operating conditions,the tubular degasser had high separation efficiency when the inlet gas content was low,especially under 15%.When the gas content continued to increase,the separation efficiency of the tubular degasser showed a large downward trend.The experimental study of the inline deliquidiser showed its good separation performance as preconditioning equipment,but it was a little insufficient as the main separation equipment.It is worthy of continual research.