A model of energy saving control using the discharge units of thermal power stations

Предложена модель энергосберегающего управления нагнетательными установками (насосы и вентиляторы) тепловых электрических станций. Показаны факторы, оказывающие влияние на энергетическую эффективность работы нагнетателя. Составлена векторная структурная схема нагнетательной установки и получена аналитическая зависимость энергетических потерь от основных технологических параметров нагнетательной установки. Установлены зависимости между основными параметрами насосной установки – давлением, объемной подачей, параметрами управляющего воздействия – частотой вращения насоса и положением регулирующей задвижки.The model of energy saving control of discharge units (pumps and fans) of thermal power stations has been proposed. The factors that affect the power efficiency of the supercharger operation have been shown. The influence of the technical performances of pipeline systems on the power station efficiency has been demonstrated. The function of power losses in the supercharger that can be varied in real time depending on the changes of power responses in the discharge units (bearing wear, a changein the Reynolds number, etc.) has been plotted. The vectorial block diagram of the discharge unit has been elaborated and the analytical dependence of power losses on major process parameters of the discharge unit has been obtained. The dependencies between the basic parameters of pump station, in particular, pressure, volumetric supply, control action parameters and pump rotation frequency and control slide position have been established. The experimental energy response of the real centrifugal pump mounted at the thermal power station was used as an example to demonstrate the technique used for the determination of the power efficiency of pump operation varying the rotation frequency and the methods of the determination of the pump operation range, which provides for the minimum power losses has been given