On-line monitoring and event location method of mine ventilation based on pressure wave

Abstract

The invention discloses a pressure wave-based mine ventilation online monitoring and event location method. The method includes the following steps: 1. By arranging a pressure wave monitoring device in the mine roadway, the downhole pressure fluctuation is monitored in real time, and according to the characteristics of the monitored pressure wave, abnormal events that occur in the underground ventilation system are judged; 2. Through the mine ventilation system Multiple pressure wave monitoring devices are arranged at different locations in the country, and the location of the abnormal event is calculated by using the pressure wave velocity and the time difference between the pressure wave and the pressure wave arriving at different monitoring points; The network is transmitted to the ground server, and whether to send out an alarm is set according to actual needs for technical personnel to make emergency decisions. The invention can monitor the operation status of the mine ventilation system in real time, and capture the abnormality of the mine ventilation system, so as to provide technical means for timely taking technical measures and avoiding the occurrence of major safety production accidents.

Description

technical field [0001] The invention relates to the technical field of mine ventilation and safety, in particular to a method for on-line monitoring and event location of mine ventilation based on pressure waves. Background technique [0002] The mine ventilation system is the most important part of the mine. It not only provides fresh air and a comfortable working environment for the underground workers, but also is crucial to the safe production of the mine. If the ventilation system is abnormal, it is easy to cause safety production accidents. For example, when the damper is abnormally opened and not closed in time or closed tightly, it will cause a short circuit of the air flow, so that some roadways will be in a state of no wind or light wind, causing suffocation or poisoning accidents for underground workers, and it is more likely to cause local gas accumulation, resulting in gas occurrence of an explosion. In addition, the serious and serious accidents in mines in t...

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Problems solved by technology

[0005] (1) The wind speed sensor can monitor the wind flow speed at a local location. The wind speed sensor uses the principle of pressure difference, ultrasonic vortex principle, ultrasonic time difference principle, photoelectric impeller principle, etc. to monitor the wind speed. Due to the low accuracy of the wind speed sensor and the low sampling rate Slow, unable to capture the high-frequency fluctuations of wind speed in the wind flow, let alone judge the occurrence of abnormal ventilation or catastrophe from the subtle fluctuations of the wind flow

[0006] (2) The wind pressure sensor is mainly used to monitor the working negative pressure of the fan. According to the monitoring data, it can be judged whether the fan is working normally, whether there is a major ventilation short circuit or a ventilation catastrophe, etc. Since the wind pressure changes little under normal circumstances, it is difficult to Identify or locate the occurrence of underground ventilation safety accidents

[0009] The above various sensors related to the ventilation system can only monitor whether the local parameters at the installation location are normal or not, and cannot judge the occurrence of ventilation events based on the subtle fluctuations of the air flow in the ventilation system. At the same time, the existing sensors and safety monitoring systems lack systematic The overall monitoring and analysis function cannot identify the type of catastrophic event that occurred

[0010] There are related technologies that use the installed ventilation sensors, combined with the dynamic calculation of the ventilation network, to perform dynamic calculation and dynamic evaluation of the ventilation system, and to judge in real time whether the mine ventilation system is operating normally. However, this system requires the establishment of a complete mine ventilation system solution. In addition, the mine ventilation system is frequently and dynamically adjusted during the mine production cycle, so the solution model needs to be consistent with the actual system, so its application is difficult and the accuracy cannot be guaranteed

[0011] Another related technology combines the connection between the gas concentration sensor installed in the mine and the ventilation network, and uses the monitored gas concentration exceeding the limit sequence to judge the occurrence and disaster location of coal and gas outbursts. This method is affected by the installation location of the underground gas sensor. , the number of installations, and the impact of whether the sensor is damaged during a catastrophe. At the same time, it can only be used to monitor accidents related to the abnormal gushing of a large amount of gas, and cannot monitor accidents such as air short circuit, air path blockage, and gas explosion.

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