Evaporator Dynamics of a Once-through Subcritical Stema Generator: The Differential-Discrete Mathematical Modeling based Approach
作者单位：University of Belgrade Department of Control Engineering. Kraljice Marije 11120 Belgrade 35 Serbia and Montenegro University of Belgrade Department of Control Engineering. Kraljice Marije 11120 Belgrade 35 Serbia and Montenegro
会议名称：《第二十四届中国控制会议》
会议日期：2005年
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学]
关 键 词：Mathematical modelling distributed process dynamics heat exchangers evaporators
摘 要：正 A dynamic thermal-hydraulic mathematical model of evaporator dynamics of a once-through subcntical steam generator is derived and presented. This model allows the investigation of evaporator dynamics including its transients responses. The evaporator was considered as a part of three-section （economizer, evaporator and super-heater） model with time varying phase boundaries and is described by a set of linearized discrete-difference equations which, with some other algebraic equations, constitutes a closed system of equations possible for exact computer solution. This model has been derived upon the fundamental equations of mass, energy and momentum balance. For the first time, a discrete differential approach has been applied in order to investigate such complex, two phase processes. Namely, this approach allows one to escape from the model of this process usually described by a set of partial differential equations and enables one. using this method, to simulate evaporators dynamics in an extraordinarily simple way. In current literature this approach is sometimes called phvsical discretization.