Improving the quality of pump installations through the enhancement of control systems

Abstract

The article outlines approaches to solving the important scientific and technical problem of
creating energy-saving control systems for technological objects. The initial scientific principles are
formulated, the general procedure for the creation and implementation of energy-saving control systems for pumps with frequency-throttle control is presented. Analytical dependencies are presented,
which establish relationships between the main parameters of the pumping system - pressure and volumetric flow rate, and control influence parameters - pump rotation frequency and position of the control valve, thus constituting a control model. Expressions defining the values of head, power consumption, and efficiency at operating points are shown. A function of the pump flow rate dependence at the operating point on two adjustable parameters - the rotation frequency of the impeller and the
position of the control valve - is obtained. It is shown that at low pump rotation frequencies, its head
characteristic sharply decreases, however, with changes in flow rate within (0.7-1.1) Qnom, frequency
control provides the necessary head under conditions of an open valve. When creating adequate mathematical models and choosing a rational optimization method, the discussed approach to minimizing
energy losses can be used in the synthesis of control systems for practically any power equipment of
power plants. It is shown that the presence of other methods of pump regulation does not limit the
possibilities of using this method, but requires clarification of mathematical models and analysis of
energy characteristics. The proposed control system is adaptive, allowing for more accurate maintenance of the necessary technological process characteristics, thereby reducing energy losses in pumps,
as well as in the main power equipment of thermal and nuclear power plants.