Abstract
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 in 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 contribution to solving practical industrial cases. This method was verified in industrial practice for a long time, and satisfactory results were obtained.
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