Performance evaluation of a Coriolis flowmeter for measuring mass flow rate of CO₂ with impurities under CCS conditions

Accurate mass flowrate measurement of CO₂ with impurities in CCS transportation pipelines is challenging. The presence of impurities affects the phase behavior and physical properties of CO₂-rich mixtures. This increases the difficulty in flow metering for financial accounting and custody transfer. In this paper, the performance of a Coriolis flowmeter for measuring the mass flowrate of CO₂ with impurities is evaluated. Experiments were conducted on a 50 mm bore horizontal pipeline on a purpose-built gas-liquid two-phase flow test rig for fluid temperature of 10∼18 °C and pressure of 50∼70 bar. The mass flowrate of liquid CO₂ is between 1000 kg/h and 3000 kg/h, and the gas volume fraction of the impurity gas is up to 15 %. Pure N₂ was injected into the test section as an impurity gas. An MLP model is established to reduce the errors in CO₂ mass flowrate measurement with impurities.