Air quantity automatic regulating method of variable working condition ventilating system

Abstract

The invention relates to an air quantity automatic regulating method of a variable working condition ventilating system, and belongs to the technical field of ventilating and dust removing. The technical scheme is as follows: the method comprises the following steps: inputting information of a dust removing pipe network and required air quantity of each dust collecting point into a pipe network property computing and controlling system, and determining the air pressure and air quantity of a fan according to the required air quantity of each dust collecting point in the ventilating and dust removing system under the existing working condition; and regulating the motor frequency or the number of turns of the fan automatically by a frequency converter or a speed-regulating fluid coupling and a PLC (programmable logic controller) control system according to the air pressure and air quantity which are provided by the pipe network property computing and controlling system as the standard, and performing the enclosed ring control of the fan according to the air pressure and air quantity signals fed back by a measuring sensor on the dust removing pipe network. According to the invention, the pipe network property computing and controlling system, the frequency converter or the speed-regulating fluid coupling and the PLC control system are separated, an individual functional module is formed respectively, and is convenient to construct and manage, the regulation of the fan property and the dust removing pipe network property as required according to the dust removing pipe network working condition variation is realized, and maximal energy conservation on the premises of guaranteeing the dust removing effect is realized.

Description

technical field [0001] The invention relates to a method for automatically adjusting the air volume of a ventilation system with variable working conditions. In particular, according to the valve switch conditions of each dust collection point, the speed of the fan is adjusted by using a frequency converter or a speed-regulating hydraulic coupler and a PLC control system, and the air volume is adjusted according to the needs. The method for fan parameters belongs to the technical field of ventilation and dust removal. Background technique [0002] The ventilation and dust removal system should meet the maximum dust removal air volume requirements and consider the influence of pipe network and dust collector body air leakage during design. Generally, the air volume of the selected fan should be more than 15% larger than the design air volume. With the large-scale ventilation and dust removal system, it is common for some dust removal systems to have more than 100 dust collect...

AI Technical Summary

Problems solved by technology

However, at present, the automatic control of fan parameters according to the working conditions of each dust collection point has not been realized, so there are the following problems: 1. One-sided pursuit of power saving effect, fan speed adjustment is too low, resulting in poor dust collection effect at dust collection points Seriously exceeded the standard; 2. There are too many dust collection points, and the valves at each point are frequently opened, and the fan parameters cannot be adjusted according to the actual situation; 3. The dust removal pipe network is complex, and the characteristics of the entire pipe network change when any valve in the pipe network is adjusted. Unable to provide appropriate amount of ventilation air volume

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