稠油采出流体余热回收流动传热特性

Flow and heat transfer characteristic of waste heat recovery fromheavy oil wellhead production fluid

为回收稠油热采生产的井口流体余热,采用数值模拟方法,研究稠油井口采出流体在矩形流道内的流场与温度场,分析不同参数对流动传热特性的影响规律,得到流动压降及传热系数计算式。结果表明:不凝气质量分数影响最大,随着不凝气质量分数增加,热交换器传热性能降低,流动阻力增大;当不凝气质量分数>10%后,流动传热特性几乎不再受其影响;进口采出液流速增加、通道水力直径减小,传热性能变强、流动阻力变大;进口温度升高使冷凝段长度降低,热交换器整体压降降低。

In order to recover the waste heat generated by thermal recovery of heavy oil at the wellhead,the flow field and temperature field of fluid in rectangular channel were numerically simulated.The influence of parameters on flow and heat transfer characteristics was analyzed,and the correlations of both flow pressure drop and heat transfer coefficient were presented.The results show that the mass fraction of non⁃condensable gas has the greatest influence on the flow and heat transfer.With the increase of non⁃condensable gas mass fraction,the heat transfer characteristics of the heat exchanger become worse and the flow resistance increases gradually.When the mass fraction of non⁃condensable gas is greater than 10%,the flow and heat transfer characteristics are largely unaffected.With the augment of flow velocity and decrease of hydraulic diameter,the heat transfer performance and flow resistance increase.Increase of inlet temperature can reduce the length of condensation section,thus resulting in a decrease in the overall pressure drop of the heat exchanger.