Gas constant-pressure desorption test device and method

Abstract

The invention provides a gas constant-pressure desorption test device and method. The test device comprises a vacuum pump, an inflation device, a desorption device, a desorption measurement device, aconstant temperature control device and a constant pressure regulating valve. The constant pressure regulating valve comprises a test valve inlet, a test valve outlet, a valve inlet, a valve outlet, avalve ball, a spring, a pressure cover with a hole, a thread, a seal ring, a spiral pressure regulating handle and a valve housing. The constant pressure regulating valve is used to maintain the pressure of the gas desorption environment in a sample can; and the newly-desorbed gas enters a measuring cylinder through the valve body, and the pressure in the sample can remains unchanged. Compressionamount of the spring is adjusted by the spiral pressure regulating handle to change valve body penetration threshold and reset gas desorption environment pressure. The device and method can measure desorption rate and desorption amount in the gas constant-pressure environment, reveal the influence laws of environment pressure on desorption, fill the blanks of the gas constant pressure desorptiontest, perfect and highlight the two-phase flow theory research and provide theoretical guidance for making catastrophe wind control and after-catastrophe rescue measures of accidents.

Description

technical field [0001] The device and method of the invention relate to the field of coal mine gas desorption test, in particular to a test device and method for gas desorption in a constant pressure environment with simple structure and feasible operation. Background technique [0002] Coal is still one of the most important energy sources in the country today. With the continuous increase of mining depth, the complex geological conditions of "three highs and one low" are becoming more and more common, making it more difficult to prevent and control coal and gas outburst accidents in my country. In the process of coal and gas outburst, the thrown coal powder and high-pressure gas together form a gas-solid two-phase flow, and the high-pressure gas expansion energy is continuously released during the propagation process, and the newly desorbed gas continuously replenishes the consumed gas expansion energy. Therefore, the two-phase fluid has larger kinetic energy and propagati...

AI Technical Summary

Problems solved by technology

Therefore, the desorption of pulverized coal in the outburst process is desorption under very pressure, and the gas pressure gradient is smaller than that of normal pressure desorption, which is obviously different from ordinary normal pressure desorption. The test device and method, and the law of desorption under constant pressure are very important for the supplementary quantitative calculation of gas expansion energy in the process of two-phase flow propagation

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