Measuring device for gas parameters of water-bearing coal seam by dynamic balance method

Abstract

A device for measuring gas parameters of water-bearing coal seams by a dynamic balance method includes a fixing device, a water balance device, a gas processing device, and a water, gas, and coal layering device. It is suitable for measuring the amount of gas emission and gas pressure in boreholes of water-bearing coal seams and collecting gas on site, and it can effectively, safely and accurately measure the index data of water-bearing coal seams. The device opens up a new method for measuring the borehole data of the water-bearing coal seam, and can directly measure the gas emission of the water-bearing coal seam and the gas pressure of the borehole of the water-bearing coal seam. Its structure is simple, convenient and effective, no complicated electronic monitoring equipment is needed, its measurement result is accurate, its operation is convenient, and its safety factor is high.

Description

technical field [0001] The invention relates to a device for measuring gas parameters of water-bearing coal seams by a dynamic balance method, in particular to a device for measuring gas pressure, gas gushing volume and water gushing volume of boreholes by balancing borehole water gushing volume and drainage volume . Background technique [0002] At present, the measurement of gas parameters in water-bearing coal seam boreholes is greatly affected by the water inrush, especially in water-bearing outburst coal seams, the accuracy of gas parameter measurement is not high. Therefore, it is of great significance to accurately and safely measure the index parameters such as coal seam gas pressure, coal seam gas emission, and borehole water inflow to realize the safe production of water-bearing outburst coal seams. However, if the pressure is directly measured with a pressure gauge after the coal seam is drilled and sealed, the measured data will lose accuracy due to the influenc...

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Problems solved by technology

[0003] ① If the drilled hole is inclined upwards, the water pouring into the drilled hole from the coal seam will liquid seal part of the gas, so that the gas cannot pass through the water separation membrane, resulting in inaccurate gas pressure measurement;

[0004] ② The water-rich coal seam is mostly coal slime water, which will block the water separation membrane, affect the passage of gas and cause the measured gas pressure to be inaccurate;

[0005] ③ Unable to control the balance between the amount of water poured into the borehole and the amount of water discharged. When the amount of water poured into the borehole is greater than the amount of water discharged, the pressure in the borehole increases due to the increase in water volume, so that the gas rich in the coal seam is not easily released to the borehole. hole, resulting in inaccurate measured gas pressure;

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