Gas desorption experiment system under variable-pressure and variable-temperature conditions

Abstract

The invention relates to a gas desorption experiment system under variable-pressure and variable-temperature conditions. The device comprises an inflation system, a vacuumizing system, a variable-pressure and variable-temperature system, a desorption environment pressure control system and a parameter acquisition and measurement and control system. The inflation system comprises a high-pressure gas source, a gas pressure reducing valve and a pressure gauge; the vacuumizing system comprises a vacuum pump, a vacuum meter and a three-way valve; the variable-pressure and variable-temperature system comprises an electromagnetic coil and a true triaxial loading device; the desorption environment pressure control system comprises a pressure buffer tank, a pressure maintaining container, a piston,a piston rod and a servo motor; the parameter acquisition and measurement and control system comprises a gas pressure sensor, a temperature sensor and a flow meter. The real stress environment and the real temperature condition of a coal sample can be reduced, the desorption environment pressure is controlled, a computer intelligently controls the experiment system, and data is monitored in realtime. The experiment system is accurate in measurement and control, wide in measurement and control range, stable in pressure control and intelligent in operation. The gas desorption rules of different temperatures and desorption environment pressures can be better studied.

Description

technical field [0001] The invention relates to the field of coal mine gas disaster prevention and control, in particular to a gas desorption experiment system under variable pressure and variable temperature conditions. Background technique [0002] Coal bed gas content is a key parameter used to characterize the characteristics of coal bed methane reservoirs, so accurate determination of coal bed gas content is of great significance for the exploration and development of coal bed methane resources and the prevention and control of coal mine gas disasters. Because the stress environment of the coal seam where the coal rock is located is complex and the stress conditions change rapidly, the pores and fissures of the coal rock change, which leads to the corresponding changes in the gas desorption of the coal seam. Therefore, it is necessary to understand the gas desorption characteristics of the coal seam through experimental means. The temperature of the coal seam where the ...

AI Technical Summary

Problems solved by technology

However, at present, the influencing factors considered in the gas desorption experiment are relatively single, and there are few studies on the desorption characteristics of coal and rock gas under the true triaxial loading condition; the experimental system can only be set at a certain constant temperature, and the variable temperature condition cannot be realized; Most of them are static at normal pressure, and the negative pressure state is less considered

There are also problems such as low measurement and control accuracy, small measurement and control range, unstable pressure control, and low intelligence, which lead to deviations in experimental results.

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