Coal dust cleaning system with combined action of mechanical grinding and ultrasonic waves and working method thereof

Abstract

The invention discloses a coal dust cleaning system with combined action of mechanical grinding and ultrasonic waves. The coal dust cleaning system with the combined action of the mechanical grindingand ultrasonic waves comprises two mechanical crushing devices and two ultrasonic wave crushing devices, the two mechanical crushing devices are the same in structure and are arranged on the left sideand the right side in a horizontal well section of a U-shaped production well in a bilateral symmetry mode, and the two ultrasonic wave crushing devices are the same in structure and are arranged ina left vertical well section and a right vertical well section of the U-shaped production well in a bilateral symmetry mode, and liquid discharging gaps making contact with a coal seam are evenly formed in the inner wall of the middle of the horizontal well section. According to the coal dust cleaning system with the combined action of the mechanical grinding and ultrasonic waves, coal dust in coal seam drainage liquid is crushed twice through mechanical crushing and ultrasonic wave crushing, it is guaranteed that the size of coal dust particles crushed twice is too small to block the U-shapedproduction well, and liquid mixed with the coal dust is drained out of the U-shaped production well more smoothly.

Description

technical field [0001] The invention relates to the technical field of coal bed gas extraction, in particular to a coal dust cleaning system and its working method in which mechanical grinding and ultrasonic waves act together. Background technique [0002] Coal bed methane drainage is a process in which the pressure of the reservoir is continuously reduced. Due to the high brittleness of the coal and its easy crushing, the coal seam is easy to collapse and has poor cementation, and the powder and other solid particles are easy to migrate. Due to the dual effects of gradient and seepage, the stress on the coal seam increases, so the instant surface of the coal seam breaks away to produce coal powder. Coal powder and other solid particles entering the rod pump or screw pump during the drainage process will wear the rotor, stator and plunger, which will affect the efficiency of the drainage pump and force the coalbed methane to perform multiple workover operations. Especially...

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Problems solved by technology

[0003] At present, the treatment of pulverized coal is mostly by means of filtration. For example, a device for fishing pulverized coal in coalbed methane wells published in patent 201520468822. Subsequent processing after salvage, increasing follow-up workflow

In addition, there are few studies on drainage production theory and drainage technology equipment suitable for my country's coal seam geological conditions, which cannot meet the actual needs of coalbed methane mining.

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