摘要
为明确采用收缩-扩张喷管来实现天然气中H2S气体凝结与液化的可行性,对CH4-H2S双组分在收缩-扩张喷管中超声速流动液化过程进行了理论研究与数值模拟。运用流体力学计算软件,结合流动控制方程,分析了入口压力和出口背压对混合气体流动特性的影响。研究结果表明:适当提高入口压力,将使CH4-H2S双组分临界液化温度和压力降低,且停留在气液两相区和液相区的范围增大,促进H2S气体的凝结;随着出口背压(压比)的不断增大,产生激波的位置逐渐向收缩-扩张喷管喉部方向移动,收缩-扩张喷管轴线处的压力和温度波动更加剧烈,破坏了凝结所需要的制冷环境,不利于H2S气体的凝结;当出口背压在60%以上时,制冷环境被完全破坏,H2S气体不能实现凝结。
In order to clarify the feasibility of using the designed convergent-divergent nozzle to realize the condensation and liquefaction of H2S in natural gas, the supersonic flow liquefaction process of CH4-H2S in the convergent-divergent nozzle is studied theoretically and simulated numerically. The effects of inlet and outlet pressure on the flow characteristics of mixed gas are analyzed by using the hydrodynamic calculation software and flow control equation. The study results show that the critical liquefaction temperature and pressure of CH4-H2S binary components reduce by properly increasing inlet pressure, and the range of residence in gas-liquid two phase zone and liquid phase zone increases, which promote the condensation of H2S gas. With the increase of back pressure (pressure ratio) at the outlet, the position of shock wave gradually moves towards the throat of contraction- expansion nozzle, and the pressure and temperature fluctuation at the axis of the contraction- expansion nozzle is more intense, which destroys the refrigeration environment needed for condensation and is not conducive to the condensation of H2S gas. When the back pressure of outlet is above 60%,the refrigeration environment is completely destroyed,and the condensation of H2S gas cannot be realized.
作者
边江
曹学文
牟林升
宋晓丹
褚奇
BIAN Jiang;CAO Xuewen;MOU Linsheng;SONG Xiaodan;CHU Qi(Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety;College of Pipeline and Civil Engineering,China University of Petroleum (East China;Offshore Oil Engineering (Qingdao) Co.,Ltd.)
出处
《油气田地面工程》
2019年第10期69-74,共6页
Oil-Gas Field Surface Engineering
基金
国家自然科学基金（51274232,51406240）
关键词
天然气
硫化氢
超声速流动
收缩-扩张喷管
液化
natural gas
hydrogen sulfide
supersonic flow
convergent-divergent nozzle
liquefaction
