A method for evaluation of the critical velocity in the case of two (vapor-liquid)-phase mixtures transported in pipelines was developed. This method is based on a theoretical background of complex hydrocarbon mixture thermodynamics with respect to application in the petrochemical industry. Methods published so far have focused on applications ill the power industry, where the water-steam two-phase system is considered. The method presented allows one to calculate pressure drop, velocity, and temperature profiles for two-phase complex hydrocarbon systems and to identify the critical flow presence. In this method the critical condition means a singular discontinuity where the finite pressure and/or velocity change corresponds to an infinitesimal change in space coordinate. An. example of applying the method in the case of a furnace-to-distillation column transfer line is shown. It can be observed that using this method can be considered a col contribution to solving practical industrial cases. This method was verified in industrial practice for a long time and satisfactory results wets obtained. [References: 12]
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