Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:化工学报

Volume:70

Issue:8

Page Number:3071-3077

ISSN No.:0438-1157

Abstract:Three sets of industrial-scale dense phase CO2 pipelines (length 258 m, inner diameter 233 mm) leaking experiments with different pore sizes (50, 100 and 233 mm) were carried out, and the time-history curves of CO2 pressure and temperature at different positions in the tube were recorded. The change of CO2 density, enthalpy value and Prandtl number (Pr) was obtained by using REFPROP software. The variation of thermodynamic characteristics of dense CO2 pipeline leakage and pressure loss process was studied. The results show that after the pipeline leaks, the dense phase CO2 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 CO2 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 CO2 phase transition.

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