Application of Multi-period Variable Frequency Air Distribution Method in Ventilation System of Meishan Iron Mine
Received date: 2020-03-17
Revised date: 2020-09-21
Online published: 2021-03-22
Meishan iron mine adopts the ventilation system of four-stage progressive return fan station，with many main fans and wide distribution.In order to strengthen the management of ventilation system，the remote control system of multi-stage fan station of the mine was gradually established in 2006.Main fans are equipped with frequency converter，total installed capacity of 15 main fans is 2 730 kW，actual power consumption of full-time operation is 1 940.76 kW，and the annual ventilation cost is up to 14.4509 million Yuan.If the ventilation of working faces with constant air volume according to the maximum demand，it shall be inevitably result in the waste of air volume and energy consumption.At present，changing the characteristic curves of the main fans to adjust the air volume can be achieved by adjusting the installation angle of the blade or the frequency conversion of 1 Hz amplitude，but this method is time-consuming，laborious and difficult，and the method of precise frequency modulation to adjust the air volume is relatively weak.Therefore，based on the theory of “balance of supply and demand”，ventilation period is divided into three，according to the number of mining face，driving working face，other working faces and chambers，and given a certain air leakage coefficient to determine the actual air volume in three periods for ventilation on demand，which can maximize the effect of ventilation and energy saving.According to the relationship between frequency，rotation speed and air volume in the theory of electromotor and fluid mechanics，the actual operating frequency of each main fan meeting the mine air demand in three periods was calculated accurately.Each main fan is precisely and remotely frequency modulated by PLC remote control system，which simplifies the complicated regulation mode of ventilation management personnel adjusting air volume by frequency 1 Hz.After normal operation，the actual air volume in three periods can meet the requirements，and the actual power consumption in each period is 1 093.28 kW，1 385.06 kW and 1 786.38 kW.Through the implementation of research plan of multi time precise frequency conversion and energy saving ventilation technology，the ventilation cost of mine ventilation system is saved by 3.865 million Yuan per year，which solves the problems of air volume，energy consumption and waste caused by full ventilation of the mine ventilation system.The effect is remarkable，which embodies the advanced nature of modern mine ventilation and energy saving technology，and fully displays the advantages of multi-stage time station frequency conversion ventilation “intelligent” energy saving.
Zhicheng XU , Weiwei JU . Application of Multi-period Variable Frequency Air Distribution Method in Ventilation System of Meishan Iron Mine[J]. Gold Science and Technology, 2021 , 29(1) : 129 -135 . DOI: 10.11872/j.issn.1005-2518.2021.01.059
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