On the efficiency of pulse supply of the working environment in water supply systems

Abstract

Practical applications of previously obtained theoretical results on the use of pulsed (cyclic) connection of pumps operating on a network to cover substantially variable loads of a pumping station are considered. The analysis of the efficiency of pumping stations with various units of pumping units and the parameters of water supply systems at variable loads based on the analysis of the developed mathematical dynamic model of the production and distribution of the working medium (water) has been carried out. The resulting engineering theory also served as the basis for the development of algorithms for optimizing the supercharger feed control system by transferring it to idle, including by deep throttling, with step regulation or with the drive motor completely turned off, to analyze the operation of the pumping station in variable modes while covering uneven load schedules with an estimate of the energy consumption, in order to determine and increase the economic efficiency of using different pump equipment in the proposed modes. Rational layout of the pumping equipment, effective values of the duration of the pulses of the working medium supply by the units of the pumping station and the pause between pulses, as well as the duty cycle of the pulses using various blocks of pumping equipment have been determined depending on the capacity of the network, accumulating devices and the liquid consumption. An important characteristic of the reliability of the «electric drive-pump» system is the frequency of cycles that limit the number of regulated starts of electric motors of the corresponding power. The significant influence of the listed factors and the specified functional parameters on the characteristics of the pulse connection of the superchargers and the intensity of the energy supply at variable loads is shown. It is characteristic of the process that when comparing different pulse supply modes (with and without idle), the more preferable mode is the mode with the pumps completely disconnected from the network. As this takes place, the efficiency increases with the increase in the number of operating units and reaches 15% in comparison with the traditional way of supplying a working medium to cover the variable loads of the station. The results obtained can also be useful for solving optimization problems during the operation of a pumping station in variable modes when covering its annual load schedules. This approach and the solutions presented can be extended to other classes of injection stations with compressors or fans that use gas as a working medium to cover uneven loads of the injection stations