不同压力下Laval喷管天然气超声速脱硫化氢性能  

Supersonic dehydrogenation of natural gas with Laval nozzle under different pressures

作　　者：曹学文[1] 宋晓丹 边江[1] 牟林升 褚奇 Cao Xuewen;Song Xiaodan;Bian Jiang;Mou Linsheng;Chu Qi(College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao 266580,China;Offshore Oil Engineering(Qingdao)Co.Ltd.,Qingdao 266520,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,青岛266580 [2]海洋石油工程(青岛)有限公司,青岛266520

出　　处：《低温与超导》2019年第11期6-10,共5页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51274232,51406240)资助

摘　　要：为了研究采用Laval喷管实现天然气中硫化氢气体凝结与液化的可行性,建立了天然气中硫化氢气体超声速凝结的数学模型,研究了Laval喷管内甲烷-硫化氢混合气体超声速流动基本规律,对比了不同压力下Laval喷管天然气超声速脱硫化氢性能。结果表明:当甲烷-硫化氢双组分混合气体流入喷管后,经过喷管的渐缩段,马赫数不断增大,压力温度不断降低,在喉部处达到声速,流经喉部后气体高速膨胀,马赫数最大可达2.06;随着入口压力的升高,成核率起始位置前移、成核区域变窄,液滴数目减小,液滴半径和液相所占比重增大,Laval喷管出口处气相中硫化氢摩尔分数降低,硫化氢的脱除效率增大。In order to study the feasibility of using Laval nozzle to achieve the condensation and liquefaction of H2S gas in natural gas, a mathematical model of supersonic condensation of hydrogen sulfide gas in natural gas was established. The basic law of supersonic flow of methane-hydrogen sulfide mixture in Laval nozzle was studied, and the supersonic dehydrogenation performance of natural gas in Laval nozzle under different pressures was compared. The results show that when the methane-hydrogen sulfide mixture gas flows into the nozzle, the Mach number increases and the pressure and temperature decrease continuously through the gradual shrinkage section of the nozzle, reaching the sound velocity at the throat, and expanding at a high speed after flowing through the throat. The maximum Mach number can reach 2.06. With the increase of inlet pressure, the starting position of nucleation rate moves toward the throat, the nucleation area narrows, the number of droplets drops, the droplet radius and the proportion of liquid phase increase, and the molar fraction of hydrogen sulfide in the gas phase at the outlet of Laval nozzle decreases, while the removal efficiency of H2S gas from natural gas increases.

关 键 词：Laval喷管 天然气 硫化氢 入口压力 凝结 超声速 

分 类 号：TE645[石油与天然气工程—油气加工工程]