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Experimental study on dynamic process and flow rate of liquid CO2 discharge under gas pressurization

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  • Zhang, Quan
  • Qin, Bin
  • Rao, Jingyuan
  • Lu, Zhaijun

Abstract

Various CO2 applications require precise control of supply pressure and flow rate. This study presents a nitrogen/helium-pressurized liquid CO2 discharge system designed to maintain stable pressure and mass flow for downstream applications. Firstly, the dynamic evolutions of the pressure, temperature and flow rate of the experimental system are shown. Secondly, the effects of the initial liquid CO2 pressure and the types of pressurant gas (nitrogen or helium) on the dynamic process are discussed. Finally, in the different stable conditions, the relationships between the discharged CO2 flow rate and the downstream resistance, discharged density, and discharged pressure are investigated. The results show that the discharge pressure depends solely on pressurant gas pressure, independent of initial CO2 pressure; the mass demand of nitrogen as pressurant gas is more than 8.29 times that of helium; flow rate prediction can be achievable through experimental calibration of self−defined flow coefficient λ. This study first proposed an experimental model for flow control of liquid CO2 under helium and nitrogen pressurization conditions, and verified the significant effects of different gases on pressure and flow stability.

Suggested Citation

  • Zhang, Quan & Qin, Bin & Rao, Jingyuan & Lu, Zhaijun, 2025. "Experimental study on dynamic process and flow rate of liquid CO2 discharge under gas pressurization," Energy, Elsevier, vol. 330(C).
    • Handle: RePEc:eee:energy:v:330:y:2025:i:c:s036054422502626x
    DOI: 10.1016/j.energy.2025.136984
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