基于成核理论改进的减压波计算模型OA

CO2 pipeline transportation is an important link in carbon capture,utilization and storage(CCUS).CO2 exhibits strong compressibility and phase transition characteristics.Once a leak occurs,CO2 undergoes depressurization expansion and a strong phase transition,resulting in a sustained high-pressure plateau at the leak point,providing energy for crack propagation.This is highly detrimental to pipeline ductile arrest.Therefore,it is necessary to establish a calculation model for predicting the CO2 decompression wave and provide theoretical methods for evaluating and preventing crack of CO2 pipelines.Firstly,the concepts of"gas-like"and"liquid-like"CO2 are proposed based on the physical properties of CO2.The pressure decompression wave data of gas-like and liquid-like CO2 are collected and combined with homogeneous nucleation theory to describe the overheating and undercooling limits and analysis the decompression platform values.Based on the existing homogeneous entropy model,an improved method is proposed.The calculation errors of the improved model for both gas-like and liquid-like CO2 decompression wave platforms have been reduced from 10％—40％and 10％—35％to within±10％.