适用于超临界CO_2管道输送的水力模型及特性研究

Study on Hydraulic Model and Characteristics for Supercritical CO_2 Pipelines

以稳定流的连续性方程、运动方程及能量方程为基础,结合PR方程拟合得到的密度表达式建立了超临界二氧化碳(CO_2)的水力计算模型。对国内外推荐模型及本文建立的模型进行计算比较,优选出适合于超临界二氧化碳的水力计算模型。通过对该水力模型进行分析得出结论:增大管径可以增加输量;同等管长下压气站数量增加1倍,输量可以增加41.4%;输送温度越低,管道输送能力越大;提高起点压力对流量的影响大于降低终点压力对流量的影响。

Basing on the stabilized flow equation of continuity equation, motion equation and the energy equation and using density equation established the hydraulic models of supercritical carbon dioxide（CO_2）.Compared with the accuracy of the equations recommended with established,as a result,the established equation is the better one.Based on the analysis on this model,the conclusions can be drawn：the flow rate is increasing with increase of the pipeline size;under same length,each twofold increase of compressor station will cause flow rate increase by 41.4%;the cold temperature can enhance transportation capacity and the increase of initial pressures compared with drop of terminal pressure has greater impacts on transportation capacity.