Self-oscillation coal powder filtering system used in process of coalbed methane mining

Abstract

The invention discloses a self-oscillation coal powder filtering system used in a process of coalbed methane mining. The self-oscillation coal powder filtering system comprises an external cylinder seat, an end cover, a spring assembly, a filter screen assembly, an oscillation piece, a water inlet pipe, a water outlet pipe and a sand pump; the external cylinder seat is a cylinder body internally provided with a cavity, and a hole is formed in the bottom center of the external cylinder seat; an upper pipe orifice of the water inlet pipe extends upward from the hole in the bottom of the externalcylinder seat into the inner cavity of the external cylinder seat; a lower pipe orifice of the water inlet pipe is connected with a coalbed methane mining well downward; the end cover covers the upper end of the external cylinder seat in a sealing mode; a gas outlet communicating with an external coalbed methane mining pipeline is formed in the center of the end cover; the end cover, the spring assembly, the filter screen assembly and the oscillation piece are sequentially connected from top to bottom; the gas outlet is surrounded by the filter screen assembly; the oscillation piece is hung over the pipe orifice of the water inlet pipe; a water outlet is formed in the bottom of the external cylinder seat; and the sand pump communicates with the water outlet through the water outlet pipe.According to the self-oscillation coal powder filtering system, coalbed methane and coal powder are effectively separated, the coalbed methane and the coal powder are correspondingly collected, and the extraction efficiency is improved.

Description

technical field

[0001] The invention relates to a system for filtering pulverized coal, in particular to a system for filtering pulverized coal with self-excited oscillation used in the mining process of coal bed gas. Background technique

[0002] At present, during the mining process of coalbed methane, coal powder will be produced, and for coal powder, the mechanism of its production is that the geological characteristics of the coal seam determine that coal powder will be produced during engineering disturbance and other processes. Coal seam geological characteristics (such as coal rock composition, inorganic mineral composition, degree of metamorphism, coal body structure, etc.) Inducing factors for powder production. In the drainage and depressurization process of coalbed methane development, the drainage system is unreasonable, the drainage intensity is high, the gas production growth rate is fast, and the bottom hole pressure fluctuation will also affect the producti...

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