Method for collocating constant-pressure dispersed variable-flow cluster type water pumps

Abstract

The invention relates to a method for collocating constant-pressure dispersed variable-flow cluster type water pumps. The method comprises the following steps: 1) determining a change rule of dispersed flow working conditions; 2) setting optimal flows of three types of water pumps; 3) starting corresponding water pump combinations according to different dispersed flow requirements; 4) setting theoptimal performance index according to the principle of minimum total water supply error; 5) nonlinearly optimizing problem and solving undetermined optimal flows of the three types of water pumps; 6) collocating the water pumps according to the optimal flows; and 7) constructing a constant-pressure dispersed variable-flow high-efficient cluster type water pump system, connecting the three water pumps with three motors and three control valves, and collocating a PLC (Programmable Logic Controller) control unit, a full-voltage bus, three soft starters and three alternating current contactors. The method has the advantages that the method can meet the change demand of seven flow working conditions; the deviation between a rated power supply volume and the actual demand is small; the water pumps can run in a high-efficiency section; the energy-saving effect is excellent; an adjusting device and a frequency converter are unnecessary in the whole system; the one-time investment is low; thecost performance of the whole system is high; few equipment is used; the reliability is high; big and small water pumps are both considered; flexible scheduling is realized; and the most economical collocation is realized.

Description

technical field [0001] The invention relates to a cluster type water pump configuration method for constant pressure discrete variable flow in a water supply system. Background technique [0002] The water consumption of industrial and mining enterprises usually changes year by year, month by month, day by day, and time by hour. However, the water supply system of most enterprises often adopts the water supply method that meets the maximum flow demand for water supply. With the waste of power, at the same time, the loss of water head in the pipeline is related to the size of water consumption, the efficiency of the pump is greatly reduced, and it often causes a great waste of electric energy. For complex water supply and drainage systems, relevant literature has disclosed a group-controlled water pump system consisting of multiple pumps and multiple frequency converters. Above all, it solves the problem of waste of water resources and improves the system efficiency, but the...

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Problems solved by technology

[0002] The water consumption of industrial and mining enterprises usually changes year by year, month by month, day by day, and time by hour. However, the water supply system of most enterprises often adopts the water supply method that meets the maximum flow demand for water supply. With the waste of power, at the same time, the loss of water head in the pipeline is related to the size of water consumption, and the efficiency of the pump is greatly reduced, which often results in a great waste of electric energy.

For complex water supply and drainage systems, relevant literature has disclosed a group-controlled water pump system consisting of multiple pumps and multiple frequency converters. Above all, it solves the problem of waste of water resources and improves the system efficiency, but there are still the following problems: (1) The whole system is equipped with many frequency converters, the price of frequency converters is high, the one-time investment is large, and the cost performance of the whole system is low; (2) There are many devices , the control is complicated, and the reliability is reduced; (3) The parallel operation mode of the pumps of the same model cannot achieve both size and flexible scheduling

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