Trend control method for gas supply of air compressor set

Abstract

A trend control method for gas supply of an air compressor set enlarges a pressure control section. Five pressure sections, including, a low pressure section, a low pressure adjustment buffering section, a standard pressure section, a high pressure adjustment buffering section and a high pressure section, are provided. A trend variable deltaP of a pressure is introduced for control, and a cycle period control is introduced; sampling is carried out in each cycle period; a section corresponding to a pressure of a pipe network is firstly judged, and then a compressor is started up or stopped based on the size of the trend variable deltaP. The trend control method for the gas supply of the air compressor set is adaptable to changeable air use condition at different time sections, has small gas supply pressure fluctuation, reduces start-up and stopping frequency of the compressor, and prolongs service life of the compressor. Meanwhile, energy consumption is saved as the compressor cannot be in an unloading state.

Description

technical field [0001] The invention relates to the technical field of on-line control of compressors, in particular to a method for controlling multiple screw compressor units. Background technique [0002] With its superior control performance, screw compressors have been widely used in various industries. Although the control performance of a single screw compressor is good, when multiple compressors are running online, the main control method currently used in the market is: set one compressor as the master and the other compressors as slaves. On-line control loading pressure, unloading pressure, number of on-line units and on-line control delay time are set in the host. After the host starts, it automatically enters the online control mode. When the pressure of the pipe network is higher than the set maximum pressure, after a delay for a period of time, the master will control a slave to unload, and stop after unloading for a certain period of time. When the pipe net...

AI Technical Summary

Problems solved by technology

Since the gas consumption situation is constantly changing, the delay time set by this control method cannot adapt to the changing gas consumption conditions in different time periods, resulting in large fluctuations in the gas supply pressure and frequent start and stop of the compressor, which affects the use of the compressor. life

At the same time, the compressor will be in an unloaded state, the compressor will not produce gas, but the motor will still run, resulting in a huge waste of energy

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