Consumption of Irrigation Pumps Pumping Water with a High Content of Mechanical Impurities

Abstract

The water pumped by reclamation stations of the Republic of Uzbekistan contains many mechanical impurities. This negatively affects the operation of pumping units. There is a decrease in the operating parameters of the pumping unit and the associated increase in electricity consumption. Analysis of the alluvial regime of the main water sources of large pumping stations shows that the sediment concentration can reach values of 15-20 kg/m3 and, on average, up to 8-10 kg/m3 (i.e., exceed the permissible values according to the technical requirements for centrifugal pumps by 2-3 times). Based on the consideration of a two-phase liquid model (pure water and mechanical impurities) and formulas for determining the useful power, a dependence is derived to determine the magnitude of the increase in power consumption. According to this dependence, a graph of the dependence of the increase in the value of the required useful power depending on the concentration of mechanical impurities in the pumped water is constructed, which can be applied in practice during the operation of irrigation pumping stations. The results of a quantitative analysis of the influence of the content of mechanical impurities in the pumped water on the value of the pump's useful power showed that with average turbidity of the pumped water of 10 kg/m3, the overspending of electricity would be 1.75%. This is of great practical importance for the machine water lifting of the Republic of Uzbekistan (the main consumer of electricity in the agricultural sector), and the results can be used to develop an energy-saving strategy in the field of operation of irrigation pumping stations.

Study of operating mode of axial and centrifugal pumps with hydroabrasive wear of parts in flow section of pumping units

“…The impeller for the sensor located at the level of the middle and final parts of the blade corresponds to the nature of the change in wear of the blades and the impeller chamber. The smallest pulsation value 2A', and the minimum wear value ΔG correspond to the Q=Q exp mode [15][16][17][18][19][20][21][22]. The correspondence between the nature of wear curves and pressure pulsations gives grounds to assert that the increase in the intensity of hydroabrasive wear is significantly affected by pressure pulsations that occur in the flow part of hydraulic machines, depending on their mode of operation.…”

Improvement of water distribution management methods for operating modes of machine channels

“…-creation of a methodology for calculating processes that occur during emergency shutdowns of pumps equipped with new flow-forming systems [9,10]. The method of kinetic averaging used in the flow part of the pumps corresponds to the method of stabilizing cross-sectional average velocities in the water supply structures of the PS [11,12].…”

Method for determining optimal overhaul service of centrifugal and axial pumps

“…When operating for six months (from 1.05 to 1.11) a year, the optimal overhaul life of a 200D-90 centrifugal pump is t0=810 h, and the maximum allowable clearance is S=1.9 mm, and for the PG-35MA axial pump is t0=1725 h and S=2.2 m. This means that for the effective use of pumps with a duration of operation of six months during the year, it is necessary to carry out current repairs of their parts at least 3-4 times. Since it is impractical to carry out repairs during the irrigation season, to increase the overhaul life of pumps, recommendations should be developed on the choice of their operating modes, improving structural elements, the use of wear-resistant materials for the manufacture of parts and modern methods for their restoration [17][18][19][20][21][22]. 1.…”