Cyclone separation and mechanical crushing type coal dust cleaning system and working method thereof

Abstract

The invention discloses a cyclone separation and mechanical crushing type coal dust cleaning system which comprises two cyclone separation devices and two mechanical crushing devices. The two cycloneseparation devices are identical in structure and are arranged at the left end and the right end in a horizontal well section of a U-shaped production well in a left-right symmetrical mode, the two mechanical crushing devices are identical in structure and are arranged in a left vertical well section and a right vertical well section of the U-shaped production well in a left-right symmetrical mode, and drainage gaps making contact with a coal bed are uniformly formed in the inner wall of the middle of the horizontal well section. The cyclone separation devices are arranged in the U-shaped production well to realize the preliminary separation of coal dust in coal bed drainage, and the preliminarily-separated coal dust in the liquid are fully crushed through the mechanical crushing devices,so that the coal dust is prevented from blocking the U-shaped production well, the drainage failure is prevented, and the efficient and continuous mining of coal bed gas is guaranteed.

Description

technical field [0001] The invention relates to the technical field of coal bed gas extraction, in particular to a cyclone separation and mechanical crushing type coal dust cleaning system and a working method thereof. Background technique [0002] Coal bed methane is a kind of unconventional natural gas associated with coal, which mainly exists in the coal bed matrix in an adsorbed state. At present, the production of coal bed methane wells is to reduce the pressure of the coal bed to below the desorption pressure of coal by pumping the confined water in the coal reservoir. , the adsorbed methane desorbs into a large amount of free methane, and migrates to the wellbore through two different mechanisms of diffusion and flow. Therefore, the production of coalbed methane is a complex depressurization-desorption-diffusion-seepage process. [0003] Coal bed methane drainage is a process in which the pressure of the reservoir is continuously reduced. Due to the high brittleness o...

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Problems solved by technology

However, the coal debris mixed in the drainage may block the production well, and eventually lead to formation pressure rise, and the fractures will be filled with water again. Therefore, the drainage equipment should have reliable measures to prevent coal debris

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