1.吉林化工学院机电工程学院,吉林省 吉林市 132000
2.大连理工大学化工学院,辽宁 大连 116024
闫振汉(1995—),男,硕士研究生,yzh950227@163.com
喻健良(1963—),男,博士,教授,yujianliang@dlut.edu.cn
收稿:2019-03-20,
修回:2019-05-23,
网络首发:2026-07-24,
纸质出版:2019-08-05
移动端阅览
闫振汉, 喻健良, 闫兴清, 陈庆, 曹琦, 刘少荣. 密相CO2管道泄漏失压过程热力学特性[J]. 化工学报, 2019, 70(8): 3071-3077 DOI: 10.11949/ 0438-1157.20190283.
YAN Zhenhan, YU Jianliang, YAN Xingqing, CHEN Qing, CAO Qi, LIU Shaorong. Thermodynamic characteristics during decompression process of dense phase CO2 pipeline leakage[J]. CIESC Journal, 2019, 70(8): 3071-3077 DOI: 10.11949/ 0438-1157.20190283.
闫振汉, 喻健良, 闫兴清, 陈庆, 曹琦, 刘少荣. 密相CO2管道泄漏失压过程热力学特性[J]. 化工学报, 2019, 70(8): 3071-3077 DOI: 10.11949/ 0438-1157.20190283. DOI:
YAN Zhenhan, YU Jianliang, YAN Xingqing, CHEN Qing, CAO Qi, LIU Shaorong. Thermodynamic characteristics during decompression process of dense phase CO2 pipeline leakage[J]. CIESC Journal, 2019, 70(8): 3071-3077 DOI: 10.11949/ 0438-1157.20190283. DOI:
开展了3组不同孔径(50、100和233 mm)工业规模密相CO
2
管道(长258 m、内径233 mm)泄漏实验,记录了管内不同位置处CO
2
压力和温度的时程曲线。应用REFPROP软件,获得CO
2
密度、焓值和Prandtl数(
Pr
)的变化,研究了密相CO
2
管道泄漏失压过程的热力学特性变化规律。结果表明:管道发生泄漏后,密相CO
2
迅速转为气液两相,随着实验进行气液两相转为气相,并伴随固相干冰生成。相态变化导致管内介质焓值增大,介质密度突降,口径越小其参数变化越明显。由于管内介质形成多相流流体流动,越靠近泄漏口管顶位置温度变化越大,对流换热强度越大。随泄漏口径增大,CO
2
相变明显,
Pr
增大,管内介质换热从管底向管顶移动。管内换热效果在CO
2
相变临界点位置达到最好。
Three sets of industrial-scale dense phase CO
2
pipelines (length 258 m
inner diameter 233 mm) leaking experiments with dif
ferent pore sizes (50
100 and 233 mm) were carried out
and the time-history curves of CO
2
pressure and temperature at different positions in the tube were recorded. The change of CO
2
density
enthalpy value and Prandtl number (
Pr
) was obtained by using REFPROP software. The variation of thermodynamic characteristics of dense CO
2
pipeline leakage and pressure loss process was studied. The results show that after the pipeline leaks
the dense phase CO
2
is rapidly converted into gas-liquid two-phase. The gas-liquid two-phase is converted into the gas phase with the experiment
and the solid phase dry ice is formed. The phase change causes the median enthalpy value in the pipeline to increase
the density of the medium to drop sharply
and the smaller the diameter
the more obvious the parameter change. Since the medium in the pipeline forms a multi-phase flow fluid flow
the temperature change is closer to the top of the leak port
and the convective heat transfer intensity is greater. As the leakage diameter increases
the CO
2
phase changes significantly
Pr
increases
and the heat transfer in the pipeline moves from the bottom of the pipeline to the top of the pipeline. The heat transfer effect inside the pipeline is the best at the critical point of the CO
2
phase transition.
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