Throttle and expansion characteristics of supercritical carbon dioxide during its venting
Throttle and expansion characteristics of supercritical carbon dioxide during its venting
复制标题
超临界二氧化碳放空过程中的节流和膨胀特性
DOI：
10.1016/j.ijggc.2022.103800
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发表时间：
2023-01
影响因子：
3.9
通讯作者：
Qi Cao
中科院分区：
文献类型：
--
作者：
Xiaolu Guo;Jianliang Yu;Xingqing Yan;Peng Xu;Shuangqing Xu;Qi Cao
超临界CO2在动力循环发电系统和碳捕集、利用与封存（CCUS）领域有着重要的应用。排气设备是一种基本的减压方法，用于对这些系统的各部分进行减压，以便进行检查、维护或修理。放空时由于节流膨胀效应，系统会出现极低温度、干冰堵塞和超压现象。同时，释放的CO2可能导致高密度气态CO2、固态CO2颗粒和低温物质暴露于通风区域的人员。研究CO2排放过程中的流动特性对于评估干冰形成和紧急或常规操作排放过程中安全阀堵塞的危险概率是绝对必要的。采用理论分析和实验测试相结合的方法，研究了长258 m、内径233 mm的超临界CO2管道系统在垂直泄放过程中手肘、阀门和孔板的节流膨胀特性。在放空过程中，记录主管道和放空管道内的压力和温度，以及近场区的温度。阀门开启后，排气管内压力迅速上升，且上升幅度随着距离节流孔距离的减小而减小。超临界CO2通过弯曲、阀门和节流孔后，温度下降明显。主管道中的超临界CO2变为气液两相，在排气管中由于节流膨胀效应产生液态CO2。由于液相CO2的不断汽化和干冰颗粒的不断升华，并伴随着空气的卷吸过程，使得喷孔附近的CO2温度在达到最低值后处于准稳态。
Supercritical CO2has important applications in the fields of power cycle generation systems and carbon capture, utilization and storage (CCUS). The venting equipment represents a fundamental pressure-relief method for the purpose of depressurizing sections of those systems for inspection, maintenance or repair. The extremely low temperatures, dry ice blockage and overpressurization will appear in the system due to the throttling and expansion effect during venting. Meanwhile, the released CO2may cause the exposure for the high density gaseous CO2, solid CO2particles and cryogenics to the people in the venting area. The study of flow characteristics during CO2venting is absolutely essential for assessing the hazard probability of dry ice formation and the blockage of relief valves during emergency or routine operational venting. In this paper, the theoretical analysis and experimental tests were conducted to study the throttle and expansion characteristics through the elbow, valve and orifice during straight vertical venting of supercritical CO2with a 258 m long, 233 mm inner diameter pipeline system. The pressures and temperatures inside the main pipe and vent pipe, and the temperatures near field region were recorded during venting. After the valve was opened, the pressure in the vent pipe rose rapidly, and the rising range decreased with the decrease of the distance from the orifice. The temperature drops of CO2were obvious after supercritical CO2passed through the bend, the valve and the orifice. The supercritical CO2in the main pipe changed into gas-liquid two-phase, and the liquid CO2were produced in the vent pipe due to the throttling expansion effect. The CO2temperature near the orifice were in quasi steady state after reaching the lowest value due to the continuous vaporization of liquid-phase CO2and sublimation of dry ice particles, accompanied by the air entrainment process.
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影响因子：
5.2
作者：
Inthavong, Kiao
通讯作者：
Inthavong, Kiao
影响因子：
11.2
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
7.8
作者：
S. Han;D. Chang;Jooil Kim;Won-Young Chang
通讯作者：
S. Han;D. Chang;Jooil Kim;Won-Young Chang
影响因子：
3.9
作者：
H. Mahgerefteh;Peng Zhang;Solomon F. Brown
通讯作者：
H. Mahgerefteh;Peng Zhang;Solomon F. Brown