Device and method for variable-frequency optimization and energy conservation of circulating water system

Abstract

The invention relates to the field of control of a circulating water system, and in particular discloses a device and a method for variable-frequency optimization and energy conservation of the circulating water system. The method comprises the following steps: acquiring temperature of a process medium on the outlet side of a heat exchanger of at least one branch; regulating the opening of a flow control valve on a corresponding branch on the basis of the temperature of the process medium; and on the basis of the opening of the flow control valve on the corresponding branch, regulating the output frequency of a frequency converter, wherein the frequency converter is used for controlling the active power of the circulating water pump. With the application of the device and the method disclosed by the invention, the output of the circulating water system can be timely regulated in accordance with the actual operation situation of equipment; the device and the method are outstanding in energy-conserving effect; and by virtue of the device and the method, the occurrence of a bias current phenomenon can be additionally avoided.

Description

technical field [0001] The invention relates to the field of circulating water system control, and more specifically, to a device for performing frequency conversion optimization and energy saving on a circulating water system and a method for performing frequency conversion optimization and energy saving on a circulating water system. Background technique [0002] The circulating water system is widely used in petrochemical, steel, metallurgy, building materials, buildings, water supply systems and other fields. At present, the circulating water system generally adopts constant pressure and constant flow operation, which generally has the defect of excessive system margin resulting in high energy consumption, and the existing circulating water system has a low degree of automation. [0003] At present, the energy-saving transformation of circulating water systems at home and abroad mainly focuses on rectification, that is, the design of general circulating water systems and...

AI Technical Summary

Problems solved by technology

Although it can achieve a certain purpose of energy saving, there are still obvious defects: ①If the scaling of the water equipment is serious, the heat exchange efficiency of the heat exchange equipment will be reduced, but the specified maintenance and cleaning time has not been reached, which may cause the circulating water flow and head It cannot meet the operation requirements; ②Reducing the flow and head may also cause bias flow, which will lead to production failure; (3) It requires a large amount of on-site data collection to determine whether there is a surplus in the circulating water volume and the head and how much is the surplus, and increase the large field data collection Energy-saving optimization cannot be performed if the data acquisition device is not running or not functioning properly

[0004] There are some related circulating water systems in China that can adjust the motor speed of the circulating water pump based on the circulating water inlet pressure or temperature of the circulating water cooling equipment. Although it can achieve a certain purpose of energy saving, its effect is still unsatisfactory. At the same time, this technology It is still unable to eliminate the drift phenomenon that may be caused by the reduction of flow rate and head

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