Mine multi-workface air pressure integral dynamic balance control system and control method

Abstract

The invention discloses a mine multi-workface air pressure integral dynamic balance control system and a control method, and belongs to the technical field of prevention and treatment of coal mine spontaneous combustion disasters. The control system comprises a pedestrian air door and an adjusting air door, wherein an air guide cylinder is arranged passing through the pedestrian air door and is connected with a variable frequency adjustment and control ventilator; an air return pressure measuring tube is arranged passing through the adjusting air door and is connected with a first pressure sensor; the system is also provided with an overlaying gob pressure measuring tube which is connected with a second pressure sensor; the pressure sensor and a frequency converter of each workface are connected with a controller. The control method comprises the following steps: turning on the variable frequency adjustment and control ventilator of each workface to supply air into an intake entry; monitoring air pressure values of a return airway and an overlaying gob through the pressure sensor of each workface and transmitting to the controller; judging the stability of the adjustment and control system by the controller according to an air pressure value signal; maintaining the adjustment and control air pressure unchanged if the requirements are met; otherwise, considering that the system is unstable and reassigning the air pressure values so as to realize mine multi-workface air pressure integral dynamic balance.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of underground spontaneous combustion disasters in coal mines, and in particular relates to an overall dynamic balance control system and control method for multi-face wind pressure in mines. Background technique [0002] In most mining areas in my country, there are mining problems of short-distance coal seam groups, such as Datong mining area, Xishan mining area, Huainan mining area, etc. The research on fire prevention and control of short-distance coal seam groups prone to spontaneous combustion will be a major issue in underground coal mining. During the downward mining of coal seam groups, the collapse of the roof of the lower coal seam working face will cause multi-layer gobs and ground surfaces to communicate with each other, forming a complex three-dimensional cross air leakage network. The large number of air leakage sources is difficult to accurately find, and it is easy t...

AI Technical Summary

Problems solved by technology

However, for the situation where wind pressure is regulated simultaneously on multiple working faces or adjacent mine working faces, due to the influence of coal seam geological conditions and mine mining process, there may be air seepage passages between each wind pressure control area, and the wind pressure in any control area Any change in pressure will cause the wind pressure in another control area to change accordingly, thereby destroying its pressure regulation balance.

Since the connectivity status of multi-layer gobs is a chaotic body with fuzzy information and complex disorder, there are three difficulties in solving this problem: first, it is impossible to grasp the spatial connectivity status of each control area; second, the spatial connectivity status of each control area will be It will change continuously with the mine mining process, which is a dynamic process; the third is that the parameters of the connecting area channels cannot be determined, and the traditional wind network calculation method cannot be used to calculate the control parameters

Therefore, in the case of wind pressure regulation on multiple working faces at the same time in the mine, it is difficult to achieve wind pressure balance on all working faces by using traditional pressure regulation methods, and it is very easy to cause spontaneous combustion of residual coal in the goaf or gas explosion accidents

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