[Objective]To cultivate high-quality talents,a simulation of the special working conditions of a pipeline for supercritical using the characteristic line method has been designed.This approach aims to teach students new ways of thinking and technical methods,applying them to solve practical problems.Given that the main component of greenhouse gases is CO2,the development and implementation of carbon capture,utilization,and storage(CCUS)technology are vital to control global warming temperatures at 1.5 ℃.CO2 transportation,which plays a crucial role in CCUS technology,involves transporting CO2 from capture sites to storage sites,with pipeline transportation being a commonly used method.At present,the theoretical framework for controlling the special working conditions of supercritical CO2 pipelines is not yet mature enough,requiring a model to analyze parameter changes at each node over time to provide a reference for safe operation.[Methods]A mathematical model describing one-dimensional gas flow in the pipeline based on conservation laws of mass,momentum,and energy is established and solved using the eigenline method.This model is computed with MATLAB programming to simulate the CO2 pipeline operation.The eigenline method,known for its strong abstraction and cumbersome calculation process,is integrated into experimental teaching to help students learn and apply it to practical engineering problems.First,the model was verified against the gas transmission system model proposed by Kiuchi to verify its accuracy.Second,students were instructed to simulate the startup of the compressor,the opening and closing of the valve,and changes in the sub-transmission volume.[Results]The results showed that the established model can calculate changes in pressure,temperature,and flow rate at each node over time.Students gained a deep understanding of several key phenomena:when the compressor is suddenly started,parameter changes are more dramatic at nodes close to the gas source.Sudden opening and closing of valves cause pressure fluctuations,leading to a water shock effect caused by the propagation of pressure waves.Changes in sub-transmission volume result in corresponding changes in transmission volume,which eventually stabilize.[Conclusions]Through this process,students can fully grasp the principles and applications of the characteristic line method,gaining a deeper understanding of the laws of supercritical CO2 pipeline operation.Additionally,this simulation experiment can also trigger students'thinking and stimulate their interest and enthusiasm in solving engineering problems.By participating in practical operations and addressing real problems,students'professionalism and technical ability will be improved.This experimental teaching method can effectively enhance students'learning experience,providing a comprehensive and in-depth combination of theory and practice.
万方数据
维普
