Servo measuring testing system and method for coal sample gas adsorption and desorption

Abstract

Provided are a servo measuring testing system and method for coal sample gas adsorption and desorption. The system comprises a gas supply device, a vacuumizing device, a gas adsorption device, a gas desorption measurement device and an electric control device; the gas supply device comprises a high-pressure gas tank and a gasing tank; the vacuumizing device comprises a vacuum pump and a vacuum meter; the gas adsorption device comprises a coal sample tank, and the gas desorption measurement device comprises a water storage container, a water collection container, an electronic balance, a servo motor, a fixed support and a water guide pipe. According to the servo measuring testing system and method for coal sample gas adsorption and desorption, volume measurement of desorbed gas is converted into volume measurement of liquid water, test operation is easy and convenient, test data is accurate, and real-time precise automatic collection and real-time display of the test data are achieved; in addition, it is guaranteed that the gas desorbed from a coal sample is under the condition of one atmospheric pressure, and a more reliable data basis is provided for researching the coal-mass gas adsorption and desorption rule.

Description

technical field [0001] The invention belongs to the technical field of gas adsorption and desorption measurement devices, and in particular relates to a servo measurement test system and method for gas adsorption and desorption of coal samples. Background technique [0002] Coal gas desorption law provides theoretical basis for coal seam gas content and pressure measurement, coal and gas outburst prediction, and coalbed methane resource exploration and development. At present, people have carried out a lot of research on the adsorption and desorption law of coal. On the one hand, the gas loss is calculated according to the gas desorption law, and on the other hand, the outburst risk prediction index and its critical value are sought according to the gas desorption law. At present, the research method of gas desorption law of coal body mainly adopts the adsorption-desorption experiment method, and the study of the initial law of gas desorption of coal body is mainly to measur...

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Problems solved by technology

At present, the research method of coal gas desorption law mainly adopts the adsorption-desorption experimental method, while the research on the initial law of coal gas desorption is mainly to measure the desorption rate and desorption amount of coal sample gas. The measuring device is a gas desorption instrument. The technology of this equipment is very mature, but most of the gas desorption measurement adopts graduated cylinders. The use of this type of device still has the following disadvantages: 1. The test personnel need to spend a lot of time and energy to record the data, the error of manual reading is large, and the data cannot be recorded in real time; 2. When reading the scale of the liquid volume in the measuring cylinder, the fluctuation of the liquid level in the measuring cylinder due to the drainage method will affect the test personnel. Reading data, especially when the amount of gas desorption in the initial gas desorption stage is large, it is difficult for the experimenters to read the data accurately; 3. At present, the water drainage method is used to measure the gas volume, and the water can only be discharged when the pressure of the gas is greater than one atmospheric pressure, so that The methane gas desorbed from the coal sample is greater than one atmospheric pressure, and the volume of the methane gas at this time will change, and there is an error

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