粒子特性对超声速分离器分离性能的影响

Influence of particle characteristics on separation performance of supersonic separator

超声速分离技术是一项新兴的天然气处理技术。在超声速喷管内,天然气经过近似等熵膨胀和降温使其内部可凝组分发生相变凝结,经旋流器后由于气液密度差使液相被分离出来。为了研究液滴特性对分离器的分离效率的影响,建立了超声速分离器内部气体流动的数学模型,采用离散粒子模型研究了液滴密度、液滴粒径和液滴初始速率对分离器分离性能的影响。结果表明,液滴密度、半径或者初始速率的增加均会导致分离效率的提升,其中液滴半径对分离效率的影响最为显著,可以通过适当改变喷管扩张角或者增大旋流强度的方式来提升分离效率。

Supersonic separation is a novel natural gas processing technology.In the supersonic nozzle,the condensable components in the gas undergo phase change condensation after approximately isentropic expansion and cooling,and the liquid phase is separated after passing through the hydrocyclone due to the density difference between gas and liquid.In order to study the influence of droplet characteristics on the separation efficiency of the separator,a mathematical model of gas flow in the supersonic separator was established,and the effects of droplet density,droplet particle size and initial velocity on the separation performance of the separator were studied by using the Discrete Particle Model.The results show that the increase of droplet density,radius or initial velocity will lead to the improvement of separation efficiency,among which the droplet radius has the most significant effect on the separation efficiency.The separation efficiency can be improved by appropriately changing the nozzle expansion angle or increasing the swirl strength.