Direct rapid measuring method capable of desorbing mash gas content with coal seam

Abstract

The method comprises: sampling coal core from underground mining; at underground mining, measuring and calculating the gas loss quantity of coal core; at the ground, measuring and calculating the desorption of the coal mining gas; measuring and calculation the grind gas desorption of partial coal core; calculating the content of gas capable of being desorbed.

Description

technical field [0001] The invention relates to a direct and rapid determination method for desorbable gas content in coal seams. Background technique [0002] Coal seam gas is the leading factor causing major gas disasters such as coal and gas outburst, abnormal gas gushing, and gas explosion. Accurately grasping the occurrence and distribution of coal seam gas is the premise of preventing and controlling gas outburst. Therefore, the rapid increase of coal seam gas content Accurate measurements are critical. [0003] Generally, there are two main methods for measuring the original gas content of coal seams, namely indirect method and direct method. The most commonly used indirect measurement method of coal seam gas content at home and abroad is to calculate the coal seam gas content with general formulas based on the field measured coal seam original gas pressure, laboratory measurement of coal adsorption constant and industrial analysis. The indirect method to measure th...

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Problems solved by technology

The indirect method to measure the gas content of coal seams is also a commonly used method at present, but the indirect method needs to measure the original gas pressure of the coal seam underground. The measurement process of the original gas pressure of the coal seam is relatively complicated. There are strict technical requirements for the treatment of gas pressure. Regardless of which link is inadvertently handled, the pressure measurement results will be invalid or unreliable. For a specific coal seam, it is impossible to arrange a large number or more measuring points for measurement, and it is impossible to accurately grasp the occurrence of coal seam gas in a large area as a whole; secondly, the indirect method requires certain roadways, drilling and sealing works, and special sealing Pore ​​materials and special sealing equipment, etc., the amount of measurement work is large, and a large amount of laboratory work is required to determine the adsorption constant of coal and industrial analysis, etc., and the measurement cost is relatively high; thirdly, the indirect method has a long measurement cycle, generally It is about 20-45 days, which may have a certain impact on production and is not conducive to on-site application

In addition, the on-site measurement process of the indirect method is complicated, and there is still a lot of laboratory work. Most coal mines do not have technical personnel and equipment in this field, and can only be measured by professional scientific research institutes. There cannot be many layouts, and it is far from being able to adapt to the current situation of increased mining depth and abnormal gas emission

[0004] In recent years, some countries have been researching and exploring other coal seam gas content measurement methods. For example, the Chongqing Branch of China Coal Research Institute and other scientific research institutes have studied various compensation modes and their applicable conditions, mainly using ground drilling during geological exploration. Coal cores are taken from boreholes or pulverized coal is taken directly underground to measure the gas content of coal seams, but due to problems in the compensation time and compensation model, the measured value is too small, and it has not been widely used in the production process of coal mines.

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