摘要
油田伴生气通常含有大量的二氧化碳等酸性气体,为了提升油田伴生气质量,必须对天然气进行脱二氧化碳处理;将超音速旋流分离技术用于伴生气脱除二氧化碳是一条全新路径,但二氧化碳在超音速流动条件下的冷凝特性有待进一步明晰。建立二氧化碳在喷管中的相变过程数学模型,讨论二氧化碳超音速凝结流动特性,分析入口温度和压力对二氧化碳超音速凝结特性的影响规律。结果表明:二氧化碳在喷管喉部之后的扩张段发生凝结,生成大量的二氧化碳液滴;随着喷管入口温度增加,尽管凝结的二氧化碳液滴数量增加,但喷管出口和中轴线上的液相质量分数减小,凝结位置越靠近喷管出口;随着喷管入口压力增加,混合气体在喷管出口的压力和温度升高、速度减小,二氧化碳在喷管内凝结产生的液滴数量减少,喷管出口和中心轴线上的液相质量分数越大。
Oilfield associated gas usually contains a large amount of carbon dioxide and other acidic gases.In order to improve the quality of oilfield associated gas,it is necessary to remove carbon dioxide from the natural gas.The application of supersonic speed cyclone separation technology to natural gas to remove carbon dioxide is a new path,but the condensation characteristics of carbon dioxide under supersonic speed flow conditions need to be further clarified.A mathematical model of the phase transition process of carbon dioxide in the Laval nozzle was established,the supersonic speed condensation and flow characteristics of carbon dioxide were discussed,and the influence of inlet temperature and pressure conditions on the supersonic speed condensation characteristics of carbon dioxide was analyzed.The results show that the carbon dioxide will condense in the expansion section behind the throat of the nozzle,forming a large number of carbon dioxide droplets.With the increase of the temperature of the nozzle inlet,although the number of droplets produced by the condensation increases,the mass fractions of the liquid phase on the nozzle outlet and the central axis decrease,and the condensation position becomes closer to the nozzle outlet.With the increase of the inlet pressure of the nozzle,the pressure and temperature of the mixed gas at the nozzle outlet increase,and the corresponding velocity decreases.The number of droplets generated by carbon dioxide condensation in the nozzle decreases,and the mass fractions of the liquid phase at the nozzle outlet and central axis increase.
作者
范路
韩卓
蒲晓莉
马立辉
李炜
边江
FAN Lu;HAN Zhuo;PU Xiaoli;MA Lihui;LI Wei;BIAN Jiang(Technical Inspection Center,SINOPEC Shengli Oilfield Company,Dongying 257000,China;Jianghan Machinery Research Institute Limited Company of CNPC,Wuhan 430024,China;College of Pipeline and Civil Engineering in China University of Petroleum(East China),Qingdao 266580,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第1期159-165,共7页
Journal of China University of Petroleum(Edition of Natural Science)
基金
山东省自然科学基金青年项目(ZR2021QE030)。
关键词
油田伴生气
二氧化碳
喷管
超音速
凝结
oilfield associated gas
carbon dioxide
nozzle
supersonic speed
condensation
