Gas and its comprehensive treatment technology in

2022-08-09
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W3410 coal plough face gas and its comprehensive treatment technology

) the gas in the upper corner is high. Due to the small mining height of the coal plough working face, the ventilation section of the working face is much smaller than that of the fully mechanized mining face, and there is a certain air leakage behind the working face. According to the actual measurement, the air volume in the middle of the working face is only

% of the air volume of the return air along the slot, indicating that the air leakage of the working face towards the goaf is very large. Part of the gas emitted from the coal falling and coal wall of the working face is quickly diluted and diluted by fresh air flow, including material recommendation, structural function design, on-site process guidance, and part of it flows into the goaf with air leakage flow; At the same time, the residual coal and the gas of adjacent surrounding rock are also accumulated in the goaf. In the process of plastic extrusion in the goaf, under the laminar flow state with very small Reynolds number, vavis accumulates in the upper corner of the working face with the leakage air flow, resulting in high gas concentration at the upper corner

) gas emission from goaf is large. Under the influence of mining stress, the gas released after the destruction of the coal seam (coal pillar) on the side of the gob (in a slow gushing state) flows into the goaf of the working face. It is generally believed that the stress affected area is outside the working face; After the gas in the upper adjacent layer is destroyed with the roof falling, it flows into the goaf of the working face sharply along the falling zone, fracture zone and bending subsidence zone outside the pressure relief angle of the roof; The three-dimensional stress state of the lower adjacent layer changes to the two-dimensional stress state. According to the principle of material mechanics, it is necessary to produce upward strain and bending failure (manifested as floor heave), and the gas in its adsorption state will be desorbed into the gas in the free state and flow into the goaf of the working face. It can be considered that there are

gas sources in the working face: Mining layer, adjacent layer and residual coal in the goaf. Since the adjacent layers and residual coal gas in the production process flow to the working face through the goaf, it can be considered that all these gas emission sources in the working face contribute to improving the safety and effectiveness of electric vehicle batteries are divided into

: mining layers and goaf

w3410

calculation of measured data of gas emission before and after the first collapse of the main roof of the coal plough working face: the gas emission of the mining layer is

15.48 m3/min

, accounting for

<51.65

, and the gas emission of the goaf (adjacent layers and goaf residual coal) is

14.49 m3/min

, accounting for

of the gas emission of the working face.>

48.35

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