化工管道结构对超声波流量计测量精度影响的研究

Study on the influence of chemical pipeline structure on the measurement accuracy of ultrasonic flowmeter

原油、天然气流体运输过程中的流量监测是安全生产的重要环节,高精度的超声波流量计能够适应不同管道结构、不同物性流体介质的测量,有效降低了化学管道泄漏的损失。结合计算流体力学(FLUENT)软件,建立了直管、T型管的三维管道模型,并通过改变入口流量、提高管道内壁粗糙度来分析管道截面流体流型的变化情况,进而提出延长缓冲管道、优化权重系数算法等方式来提高流量计的精确度。结果表明,流体流型受管道结构的影响较大,随着流速以及粗糙度的提高,流体的湍动程度也更加剧烈。

Flow monitoring in the process of oil and gas flow is an important part of safe production. The high-precision ultrasonic flowmeter can adapt to the measurement of different f luid medium, so the loss of chemical pipeline leakage is effectively reduced. Combined with computational fluid mechanics（FLUENT）software, a three-dimensional pipe model of straight pipe T is established. By changing the inlet flow, the internal wall roughness of the pipeline is improved to analyze the fluid flow pattern of the pipeline, the method of extending buffer pipeline optimization weight coefficient algorithm is proposed to improve the accuracy of flowmeter. The results show that the fluid flow is greatly influenced by the pipeline structure, and the velocity and the roughness increase the turbulent degree of the fluid.