A flexible modular type calculation method is developed in this paper, it can be used to a multitude of applications, thus permitting many required turbomachinery systems to be simulated. In this method every standard component is considered as a subsystem, which can be readily linked in diverse ways with other components. This method can also be used for calculating the transients of nonlinear systems under large pertubation. As a case study, a computer programme for simulating the energy recovery system of the fluidized catalytic cracking (FCC) installation is presented.

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