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UDC 628.12:62-531.3
KARGIN S. A.
Analysis of Electric Power Losses in the Course of Operation of a Group of Pumps Equipped with Adjustable Drive
Summary
Calculations of the power losses in pump units with aggregates operating simultaneously, one of them is adjustable, are presented. The main advantage of a control scheme with one adjustable pump is a relatively low cost of an apparatus part. But additional power losses connected with reduction of rotation frequency of a pump impeller of the adjustable pump in the course of operation of unregulated pumps under conditions of maximum output are unavoidable. Calculations of these losses made with the use of vector diagrams of hydraulic capacity of pumps make it possible to develop a structure of a power efficient pumping unut characterized by acceptable cost of equipment and minimal power expenditures to maintain the preset pressure in a pressure line.
Key words:
pressure , pump unit , frequency of pump impeller rotation , capacity , hydraulic capacity , frequency of feeding voltage , frequency converter
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UDC 628.11/.12:658.26:004.02
DOI 10.35776/VST.2023.04.03
Baranchikova N. I., Yepifanov S. P., Dytte A.
Hydraulic calculation of group water intakes on underground wells equipped with pumps with variable speed drives
Summary
The use of variable speed drives at group water intakes on underground sources in water supply systems is aimed at saving electricity, ensuring efficient operation modes, improving the management engineering; however, without sufficient justification the desired result is not always effected. One of the reasons is the lack of calculation using an effective mathematical model that describes the movement of water in aquifers, wells, lift pipes and gathering mains, taking into account all the existing limitations, including the mode parameters while using variable speed drives in some or in all submersible pumps. The model is submitted in the form of an optimization task where the target function is the total power input of all the operating submersible pumps. The proposed optimization model provides for describing the modes of the group water intakes operating from the intake external boundary to the tanks. All the limitations of the optimization task can be divided into three non-overlapping groups as follows: balance, technologic, and performance ones. Having calculated the electricity consumption for all significant modes during the year and compared them with the costs at the existing modes without variable speed drives, we can make a reasonable conclusion about the applicability of a variable speed drive in one or more submersible pumps. The proposed model provides for arranging both efficient and technologically allowable operating modes.
Key words
frequency converter , water well , aquifer , submersible pump , hydraulic head , flow distribution task , optimization task , energy input , group water intake
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UDC 628.1/.2:621.65
Yepifanov S. P., Baranchikova N. I., Kurtin A. V.
Mathematical modeling of the joint operation of pumping units including frequency regulated ones
Summary
The use of pumping units with variable speed drives in order to save energy and provide for effective operating modes in water supply and sanitation systems, sometimes without sufficient justification, does not always furnish the desired result. One of the reasons is the lack of a simple mathematical model describing the flow distribution in the process pipelines of pumping stations with account of all the limitations of the operating mode parameters while using variable speed drives in some or all pumping units. The flow distribution task itself should be represented in the form of an optimization problem where the objective function can be the total energy input of all the operating pumping units. Such an optimization model provides for describing the operating modes of both paralleled and compound pumps. Once the electricity costs for all significant modes throughout the year have been determined and compared with the existing modes without the use of variable speed drives, drawing a reasonable conclusion about the applicability of variable speed drives in one or several pumping units becomes possible. The proposed model provides for arranging both effective and technologically acceptable modes. Based on the obtained results of calculating the optimization task for several modes, it is possible to construct approximating functions of the total flow of the pumping station from the head losses in throttling devices and use them in case of the flow meter lack or failure.
Key words
pressure , frequency converter , hydraulic head , centrifugal pump , pumping unit , flow distribution task , optimization task , energy input , parallel and serial operation of pumps
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DOI 10.35776/MNP.2020.04.08
UDC 628.1/.2:621.65:62-531.3
Rybel’ Sergei, Kuninin Vladimir, Gerasimov Semen, Bakushin Andrei
The experience of using variable speed drives at the facilities
of «Vodokanal» LLC
Summary
The experience of using variable speed drives at the pumping stations operated by Vodokanal LLC in Novokuznetsk is presented. The advantages and disadvantages of this technical device are specified. It is demonstrated that currently, the use of variable speed drives provides for reducing the energy consumption by more than 20%, reducing the repair and maintenance costs; for improving the service life of electric motors; for reducing inrush current, water leaks and the load on the pumping equipment and pipeline valving. The use of variable speed drives has paid off even in case where adjusting the parameters to ensure the technology (velocity, performance, etc.); bringing the equipment parameters to the required values without replacing it (in order to increase the equipment load to the nominal value for the subsequent period); compensating for daily irregularities in water consumption are required.
Key words
frequency converter , pumping station , frequency-regulated electric drive , improving energy efficiency , reducing the expenditures
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UDC 628.3:62-531.3.003.13
Shadrin V. A.
Improving the energy efficiency
Summary
Retrofitting frequency converters at the water and sewage pumping stations of Tchelyabinsk MUE «Water Supply and Wastewater Management Production Association» as part of the «Program of energy conservation and efficiency improvement in MUE «Water Supply and Wastewater Management Production Association» for 2010–2014» is reported.
Key words
power saving , frequency converter , energy efficiency , pumping station
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DOI 10.35776/MNP.2019.10.08
UDC 628.356.1:621.61
Iadrishchenskii A. N., Filippova N. N., Bulygin K. A., Kolobova G. I., Gordeichik A. V., Usachev A. P.
Reconstruction of the air blower station at the wastewater treatment facilities in Chita
Summary
The results of the reconstruction of the wastewater treatment facilities in the city of Chita are presented with regard to the system of supplying air to the operating sections of the aeration tanks without replacing the air blower units. The main goal of the reconstruction was energy saving and automation of air supply to the aeration tanks while ensuring sufficient oxygen concentrations in the wastewater biological treatment facilities. To change the capacity of the air blowers the automation system includes two high-voltage frequency converters for the number of blowers in operation. To regulate the air supply eight regulated valves and eight dissolved oxygen sensors (for the number of operating sections) are installed in the sections of the aeration tanks. Energy savings over four months of operation amounted to about 16.4% compared to the same period of previous years.
Key words
frequency converter , sewerage treatment facilities , aeration tank , controllable air blower station , variable-frequency control of blowers
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