Research on the valve chamber venting technology of CCUS pipeline
The flow guarantee problem in CCUS pipeline transportation is vital for realizing dual carbon goal.In order to research the reasonable valve chamber venting scheme of CCUS pipeline chamber,the physi-cal blow-off model has been established based on simulation software,and the influence of different factors on the venting process has been analyzed.pressure,phase state,blow-off rate and total blow-off has been analyzed.The dynamic rule of topography undulation on blow-off process is investigated,and the intermittent blow-off operation scheme is proposed.The results show that the temperature drop at the vent is caused by the ji-aotang effect in view of the pressure drop,and the temperature drop at the low point is caused by the throttling effect and phase change heat absorption.The greater the temperature drop at the low point is,the greater the risk is.By reducing the initial pressure,increasing the initial temperature and designing a suitable blow-off sys-tem,the temperature along the line can be significantly increased.In the intermittent blow-off process,the valve is opened four times and closed four times,the venting time is 1.21 h,and the total blow-off amount is 586 t,which makes the scheme reduce the risk of low temperature caused by pipeline venting.The research re-sults can provide practical reference for the production and operation of similar CCUS pipelines.
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