Z型管内2种组分LPG顺序输送混量数值模拟

Numerical simulation of blending liquid quantity of batch transportation of the two LPG components in Z-Tube

为顺序输送不同组分LPG时,做到准确切割混液段,以丁烷-丙烷顺序输送为例,利用计算流体动力学中的多相流Mixture模型,编写丁烷温升气化过程的传质UDF程序,数值模拟后续丙烷与前行丁烷的顺序混输过程,分析丙烷不同入口速度、管径、环境温度、丁烷气化率对Z型管下游直管段混液体积分数的影响.结果表明:随着丙烷注入速度的增加,下游直管段各截面丙烷平均体积分数增大且混合界面平缓;随着漏热量的减少,丁烷气化率降低,后续丙烷在下游直管段各截面体积分数增大;当环境温度升高时,下游直管段各截面丙烷体积分数降低;随着管径的减小,下游直管段各截面丙烷体积分数增加.计算结果可为实际生产中监测LPG各组分混液界面的动态变化规律,控制LPG产品的质量提供理论依据.

Taking propane and butane for example,owing to the leakage heat of the pipeline wall,it leads to that the butane become gas persistently and therefore it forms the phenomenon of the two flowing phases,but besides this,the trailing propane is injected into the pipeline,so the complicated mixing transportation three phases appear.By numerically computing the above process,the results indicate with the injecting velocity increasing,every interface concentration of the propane is amplified and the mixing interface is smoothing in the straight pipeline of the downstream;along with the leakage heat decreasing,the rate of gas of the propane is lessened and the concentration of the trailing propane becomes big in the straight pipeline of the downstream.When the environment temperature is rising,every interface concentration of the propane is lower in the straight pipeline of the downstream.However,with the pipeline diameter reduced,every interface concentration of the propane is adding in the straight pipeline of the downstream.The computing result may supply the theory testified with monitoring the dynamic transformation law of the every LPG phase in the actual production and controlling the quality of the LPG product.