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Effects of Flow Velocity on Transient Behaviour of Liquid CO2 Decompression during Pipeline Transportation
Processes ( IF 3.5 ) Pub Date : 2021-01-20 , DOI: 10.3390/pr9020192
Chenghuan Xiao , Zhaijun Lu , Liguo Yan , Jiaqiang Wang , Shujian Yao

Investigating the transient behaviour of liquid CO2 decompression is of great importance to ensure the safety of pipeline transportation in carbon capture and storage (CCS) technology. A computational fluid dynamics (CFD) decompression model based on the non-equilibrium phase transition and Span–Wagner equation of state (EoS) was developed to study the effects of actual flowing state within the pipeline on the transient behaviour of liquid CO2 decompression. Then, the CFD model was verified by comparing the simulated results to test data of a large-scale “shock tube” with an inner diameter of 146.36 mm. The results showed that the evaporation coefficient had a significant impact on the transition behaviour of CO2 decompression, while the condensation coefficient made no difference. When the evaporation coefficient was 15 s−1, the CFD-predicted results were in good agreement with the test results. Moreover, the effects of flow velocity on transient behaviour of liquid CO2 decompression were further investigated. It was found that the flow velocity affected the temperature drop of liquid CO2 during decompression, thereby affecting the phase transition of liquid CO2. In addition, the initial flow velocity also showed a significant influence on the transient behaviour of CO2 outside the pipe.

中文翻译:

流速对管道运输过程中液态二氧化碳减压瞬态行为的影响

研究液态CO 2减压的瞬态行为对于确保碳捕集与封存(CCS)技术中管道运输的安全性至关重要。建立了基于非平衡相变和Span-Wagner状态方程(EoS)的计算流体力学(CFD)减压模型,以研究管道内实际流动状态对液态CO 2减压瞬态行为的影响。然后,通过将模拟结果与内径为146.36 mm的大型“冲击管”的测试数据进行比较,来验证CFD模型。结果表明,蒸发系数对CO 2的转变行为有显着影响。减压,而凝结系数没有差异。当蒸发系数为15 s -1时,CFD预测结果与测试结果吻合良好。此外,进一步研究了流速对液态CO 2减压瞬态行为的影响。发现流速影响减压期间液态CO 2的温度下降,从而影响液态CO 2的相变。此外,初始流速还对管道外部CO 2的瞬态行为产生了显着影响。
更新日期:2021-01-21
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