Water injection coal sample gas diffusion initial velocity tester and testing method thereof

Abstract

The invention relates to a water injection coal sample gas diffusion initial velocity tester and a testing method thereof. The tester mainly comprises a vacuum gauge, a coal sample tank containing a coal sample, a water injector, a scaleplate, a vacuum pump and a methane gas sample bag, wherein 3.5g of coal sample is put into the coal sample tank, and the vacuum gauge and the coal sample tank are vacuumized by the vacuum pump; the coal sample tank is connected with a methane source, and gas is adsorbed by the coal sample to achieve a balanced state; 1-3mL of water is injected in the coal sample, and the gas diffusion initial velocity is tested after one and a half hours; and compared with the gas diffusion initial velocity of the naturally dried coal sample, the gas diffusion initial velocity of the coal sample can be effectively reduced by the injected water, and the effect of outburst prevention by water injection is achieved. The gas diffusion initial velocities of at least two coal samples can be tested at the same time, the experiment efficiency is greatly improved, and the water injection coal sample gas diffusion initial velocity tester not only can be used for testing the gas diffusion initial velocity of a normal coal sample, but also can be used for testing the gas diffusion initial velocity of a wet coal sample after the gas is adsorbed to be balanced. The tester has a simple structure, is convenient to operate and is low in cost, and the test accuracy is high.

Description

technical field [0001] The invention relates to a measuring instrument and a measuring method of an initial velocity, in particular to a measuring instrument and a measuring method of a water-injected coal sample gas emission initial velocity suitable for the prevention and control of coal mine gas. Background technique [0002] Coal seam water injection as a measure to prevent coal and gas outburst was first applied in the coal mines of the former Soviet Union in the 1930s. Industrial experiments were carried out and gradually applied throughout the country. So far, remarkable results have been achieved in coal seam water injection to prevent outbursts. After water injection anti-outburst measures, it is necessary to measure the initial gas release velocity of the coal sample to determine the outburst prevention effect, but the current gas release initial velocity measuring instrument can only measure the initial gas release of dry coal samples or wet coal samples before g...

AI Technical Summary

Problems solved by technology

After water injection anti-outburst measures, it is necessary to measure the initial gas release velocity of the coal sample to determine the outburst prevention effect, but the current gas release initial velocity measuring instrument can only measure the initial gas release of dry coal samples or wet coal samples before gas adsorption equilibrium. speed, but cannot determine the initial gas release speed of the wet coal sample after the gas adsorption equilibrium

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