Abstract
Transportation safety of supercritical CO2 pipeline is a key aspect of carbon capture and storage (CCS). For reducing the high pressure in supercritical pipeline when accidental cases arise, man-made release will be applied using chocking process. The downstream parameters of chocking process can be predicted based on the adiabatic process assumption. In the critical chocking process, the critical velocity at outlet is sonic. A chocking pipe can be designed for buffering between different chocking orifices according to the length of turbulence area produced by jetting momentum. For the effect of noise hazard produced by large jetting velocity, a muffler can be applied at the outlet of final stage orifice to atmosphere. For the influence of impurities on the chocking process of anthropogenic CO2 pipeline, the presence of SO2 as an impurity is helpful for increasing the downstream temperatures through the chocking device to prevent the frozen hazard, whereas the presence of N2 as an impurity indicates a lower downstream temperature. The higher initial temperature can prevent the dry ice formation at the outlet of vent pipe when the multistage chocking is applied.
Highlights
Carbon dioxide (CO2), produced by fossil fuel combustion from human activity, is the predominant anthropogenic greenhouse gas (GHG) that has led to the gradual increase in the global temperature in recent decades
(iii) For the effect of noise hazard produced by large jetting velocity, a muffler can be applied at the outlet of final stage orifice to atmosphere
This study validates the model for predicting the critical chocking of supercritical CO2 and demonstrates the influence of impurities on chocking process of anthropogenic CO2
Summary
Carbon dioxide (CO2), produced by fossil fuel combustion from human activity, is the predominant anthropogenic greenhouse gas (GHG) that has led to the gradual increase in the global temperature in recent decades. Safety on high pressure is more important in CO2 transportation of supercritical or dense phase pipeline. In high-pressure natural gas pipelines, the safety issue is to prevent the hydrate formation upon orifice when the rapid depressurization arises. Both hydrate formation and dry ice formation will be controlled at where the CO2 fluid chokes. For experimental investigation of the flow properties of releasing from high-pressure CO2 pipelines, Martynov et al [5] performed the experimental validation of a three-phase flow model for predicting the transient outflow following the failure of pressurised CO2 pipelines and vessels. Operational recommendations are provided for pressure man-made release of anthropogenic CO2 pipelines
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