Experiment device for initial laws of tectonic coal gas desorption

Abstract

The invention discloses a experiment device for initial laws of tectonic coal gas desorption. A high-purity gas steel cylinder is connected with a port of a three-way valve through a stop valve. A port of the three-way valve is connected with a port of a four-way valve through the stop valve. The four-way valve is connected with the stop valve, a vacuum gauge, a vavuum pump, a large-size measuring cylinder and a pressure gage. The three-way valve is connected with the four-way valve through the stop valve directly. The pressure gage is connected with a coal sample tank. The coal sample tank is arranged in a constant-temperature water-bath device. The bottom of the coal sample tank is connected with the constant-temperature water-bath device. A port of the four-way valve is connected with a gas mass flow meter through a spherical valve. One end of the gas mass flow meter is connected with a computer, and the other end of the gas mass flow meter is connected with a desorption instrument. Through the combination of a sensor and a computer, rapid acquisition of gas desorption speed data is achieved. The gas desorption instrument can measure the gas desorption amount synchronously, so that the reaction time of experiment data acquisition is shortened and the data acquisition precision is raised. The experiment device is advantaged by less error and large data acquisition amount.

Description

technical field [0001] The invention belongs to the technical field of gas measurement, and in particular relates to an experimental device for the initial law of desorption of structural coal gas. Background technique [0002] Structural coal is the product of brittle fracture or ductile deformation and rheological migration of coal seams under tectonic action, and it is a sign for predicting coal and gas outburst. The characteristics of low strength, high adsorption, fast release and low permeability of tectonic coal are the root causes of coal and gas outburst. Critical state of coal and gas outburst. The rapid desorption capacity of structural coal gas is also an important reason for the inaccurate determination of coal seam gas content, which seriously affects the prediction of outburst dangerous areas and the implementation effect of outburst prevention measures. [0003] At present, the prediction and prevention of mine gas disasters is mainly based on the measureme...

AI Technical Summary

Problems solved by technology

The gravimetric method has high experimental accuracy, but the device bears a small pressure, which is not suitable for gas desorption measurement under high pressure, and the gravimetric method uses few coal samples, which cannot reflect the essential characteristics of gas desorption in coal

The container method is now widely used, but the amount of coal samples in the experiment is relatively small and the repeatability of the experiment is poor

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