Abstract
The paper deals with mathematical modelling and numerical simulation of the dynamics of flow and heat processes inside the circulation loop of a power steam generator. The processes in the evaporator, drum and downcomers are modelled separately. The evaporator is treated ns n system with distributed parameters and is described by three nonlinear, partial differential equations for the mass flow, entropy and pressure. An eigenvalue analysis of evaporator system matrix A has been made. Linear and nonlinear models of circulation loop describe the phenomena of shrink and swell of drum water level. The comparative analysis of nonlinear model responses to the inputs of the same magnitude obtained at thre different load levels, clearly presents the nonlinearity of the circulation loop processes.
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