Pseudo-bond graph model and simulation of an industrial flash separator

The present paper describes the modeling and simulation of a two-phase flash separator. This equipment is part of the natural gas liquefaction process of the San Joaquı́n extraction plant located in Anzoategui State, Venezuela. The principal function of the separator consists in taking the extracted propane to saturation conditions so as to take advantage of its refrigerant properties. The pseudo-bond graph methodology was used in modeling the system. Such methodology was very suitable for this chemical process since it allows good management of the non-linearities present in the system while also accepting the use of elements that do not yield to the rules of traditional bond graph methods. Several simulations were accomplished with 20-SIM program and the model was validated using real operating conditions of the plant and by using simulation results from a previously developed model.