Application of ultrasonic sensor in wind speed measurement in mine

- Sep 01, 2020-


In order to understand whether the wind speed at various places in the shaft meets the requirements of my country's mine safety regulations and whether the required air volume can meet the requirements, in the main air lanes of the mine (the main air intake lane, the main air return lane, the main air intake lane and the main return air lane) , The wind speed should be measured regularly in the air inlet and return air lanes of the mining area, and the air inlet and return air lanes of the mining face. Wind speed measurement is an important part of mine ventilation management.
 
In order to accurately measure the wind speed, wind measuring stations should be set up in the main shafts of the mine, the air intake and return airways in the mining area. The wind measurement should be carried out in the wind measurement station; the wind measurement in the roadway without wind measurement station should select a straight roadway with no air leakage or small air leakage, no accumulation of debris, complete derrick, and little change in cross section, as the wind measurement point for wind speed measurement . Because the wind speed at each point in the tunnel section is different, in order to measure the average wind speed, the line method or the fixed-point method should be used when measuring the wind speed.

  

(1) The wind speed measurement personnel move the wind meter at a constant speed along a certain route within a certain time within the tunnel section to measure the wind. This method is called the route method. Depending on the size of the roadway section, different wind measurement routes can be selected.


(2) Divide the roadway section into several small blocks, arrange measuring points in the center of each small block, use the wind meter to measure the wind speed in equal time, and then calculate the average wind speed. This method is called fixed-point method, according to the roadway section The size can be divided into different numbers of small blocks.


If the cross-section is large, the number of small blocks divided should be more for the fixed-point method to measure wind speed; otherwise, it can be less. Generally speaking, the more measuring points are arranged, the more accurate the measured wind speed.


With the development of new energy energy saving and environmental protection, wind speed sensors and wind speed instruments are used more and more frequently. As a typical sensor, wind speed sensors are mainly devices that convert air flow speed variables into corresponding output signals. It is widely used in mine ventilation main return air tunnels, air outlets, main underground wind measurement stations, fan wellheads, tunneling faces, coal mining faces, etc., and corresponding mining enterprises with gas explosion hazard in coal mines.


The monitoring of mine wind speed is an important factor to ensure the safe production of the mine. The working conditions of the mine are special and the working environment is complicated. Wind speed measurement is an important content in mine safety. The wind speed sensor can continuously monitor the wind speed and volume of the above-mentioned locations. The real-time display of the wind speed and air volume of the tunnel is an important instrument for measuring the safety parameters of mine ventilation. In wind speed measurement, the more accurate ultrasonic wind speed sensor.


Traditional anemometers have rotating mechanical parts. These moving parts are easy to damage the sensor. The ultrasonic sensor is designed to avoid any mechanical parts being damaged and ensure more reliable operation. In addition, the ultrasonic sensor has long-term stability without maintenance.

 

Ultrasonic wind speed sensor used in mine

OSENON ultrasonic wind sensors in mine


This is a low-cost, high-precision, high-stability wind speed sensor. The system can accurately provide downhole wind speed and air volume data in real time, can be remotely set, and has multiple output interfaces to facilitate the access of sensors and base stations. Its principle is to use an ultrasonic rotary transducer to obtain wind speed. OSENON has developed and applied in this area for many years and has unique insights in wind speed measurement technology.


The speed of sound in the air is superimposed on the speed of the airflow in the wind. If the propagation direction of the ultrasonic wave is the same as the wind direction, its speed will increase; conversely, if the propagation direction of the ultrasonic wave is opposite to the wind direction, its speed will slow down.


Therefore, under fixed detection conditions, the speed of ultrasonic propagation in the air can correspond to the wind speed function. Accurate wind speed and direction can be obtained by calculation. As the sound wave propagates in the air, its speed is greatly affected by temperature; the anemometer detects two opposite directions on the two channels, so the effect of temperature on the sound wave speed is negligible.


Since there are no mechanical rotating parts, there are no problems such as mechanical wear, blockage, freezing, etc., and there is no "mechanical inertia". It can capture instantaneous wind speed changes, not only can measure conventional wind speed (average wind speed), but also can measure in any direction The wind speed component, especially the high-frequency pulsation component in the wind speed can be measured.


For wind speed measurement related application technology, please consult OSENON engineers, you will get more inspiration.

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