管道压降分析在化工生产中的应用

流体输送在化工生产中占据着重要地位,随着系统运行时间的延长,管道阻力会逐渐发生变化。选取了化工生产中的两个实际案例,其一是分析影响盐水管道输送流量的因素,通过计算结垢前后的管道静压力降、速度压力降、摩擦压力降,计算出管道的阻力增加值,以此说明管道结垢会对介质输送造成明显影响;其二是对蒸汽输送管线压力降进行分析,利用巴布科克公式(Babcock式)计算出具体的压力降,以此来判断不同末端用户的指标控制合理性。通过上述两个案例,说明阻力分析对于系统控制和优化的重要性。

On the Pressure Drop and the Velocity Distribution in the Cylindrical Vortex Chamber with Two Inlet Pipes for the Control of Vortex Flow

Vortex flow is applied to a cyclone dust collector, a vortex combustion chamber, and a vortex diode for vortex control. In order to apply the vortex flow to the industries, it is necessary to keep the stable flow condition and to estimate the response time of the transient flow process and also the intensity of the vortex flow. For control vortex flow, two types of vortex chamber with two inlet pipes were designed. One of them is to promote the vortex flow named as Co-Rotating Flow System and another one is to hinder the vortex flow named as Counter-Rotating Flow System. The pressure drops and the velocity distributions were measured for these vortex chambers. The estimation of the tangential velocity by the application of the angular momentum flux is compared with the measured velocity by a cylindrical Pitot-tube. The characteristics of the total pressure drop could be explained by introducing the circulation.