Distributed variable-frequency control system

Abstract

The invention aims to provide a distributed variable-frequency control system which can intelligently control the flow of a primary net heat exchanger according to the heat exchanging power of each heat exchanging station so as to realize the energy-saving type heat exchanging station or an energy-saving type heat exchanging units according to heat exchanging requirements, as well as the special control system required by the energy-saving heat exchanging station or the energy-saving type heat exchanging units. The distributed variable-frequency control system comprises a cabinet body and a control plate. The distributed variable-frequency control system is characterized in that a touch screen (2) is arranged on the panel (3) of a cabinet body (1); a cabinet operating power supply indicating light (4) and a fault indicating light (5) are arranged on the panel (3); a power supply inserting opening (7) is positioned on the upper left corner of the lower side surface of the cabinet; a control interface (6) is positioned at the right row of the power supply inserting opening (7); a controller PLC 10, an analog quantity signal module (8), a digital quantity module (9) and a 485 communicating module (10) are mounted in the cabinet body. A distributed variable-frequency water pump is mounted on a primary water returning pipe of the heat exchanging station through the distributed variable-frequency control system, so that the heat exchanging station can exchange heat as required according to outdoor temperature variation; quantity adjustment can be realized through the water-pumping manner of the distributed variable-frequency water pump to achieve the target that heat energy can be saved by 10 %; meanwhile, the pump lift of a primary net main circulating pump can be reduced, and the main circulating pump can be exchanged by a large flow low lift pump, so that electricity can be saved by 30%.

Description

Technical field: [0001] The invention relates to an energy-saving purpose, in particular to an energy-saving heat exchange station (unit) in an urban central heating system, especially an energy-saving heat exchange station (unit) and a control system for realizing energy saving. Background technique: [0002] The heat exchange station is an important link to realize the transmission of the heat source produced by the heat source plant of the city's central heating supply to the user (secondary network), and it delivers heat energy according to the needs of the user for each heat exchange station. The traditional arrangement of circulating pumps in the heating pipe network is to install a primary circulating pump at the heat source, which is responsible for the operation of the entire heating network. In the selection of end heat exchange station, more than 30% of the power consumption of the circulating pump is wasted on overcoming the head, resulting in a large waste of el...

AI Technical Summary

Problems solved by technology

The traditional arrangement of circulating pumps in the heating pipe network is to install a primary circulating pump at the heat source, which is responsible for the operation of the entire heating network. In the selection of end heat exchange station, more than 30% of the power consumption of the circulating pump is wasted on overcoming the head, resulting in a large waste of electric energy. At the same time, this also leads to too much capital pressure head for the near-end heat user, and the adjustment method is not in place. Under normal circumstances, the excessive flow at the near end will inevitably lead to insufficient flow at the far end, serious hydraulic imbalance, and finally the phenomenon of uneven cooling and heating in the heating system.

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