Solving practical industrial problems in two-phase multicomponent mixture flow - Critical velocity

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 thermod ynamics 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 allow s one to calculate pressure drop, velocity, and temperature profiles for tw o-phase complex hydrocarbon systems and to identify the critical flow prese nce. In this method the critical condition means a singular discontinuity w here the finite pressure and/or velocity change corresponds to an infinites imal 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 sol ving practical industrial cases. This method was verified in industrial pra ctice for a long time and satisfactory results wets obtained.