Coal mine sealing and sampling device and application method thereof

Abstract

The invention provides a coal mine sealing and sampling device and an application method thereof, which belong to a sampling device for detecting the content of gas and an application method of the sampling device. The sampling device comprises a drill bit, a supporting seat, a sampling controller, a sampling cylinder, an outer cylinder, a connector, a coal sample passage and a gas passage, wherein the drill bit is connected with the outer cylinder through the supporting seat; the sampling controller is connected into the supporting seat; the rear part of the outer cylinder is connected with the connector; and the sampling cylinder is arranged in the outer cylinder. The method comprises the following steps of: isolating the inside of an air chamber from external pressure wind in a hole drilling process in the primary stage of drilling; stopping drilling when a hole reaches a designed distance, and constantly introducing pressure wind into the air chamber through an air chamber passage to guarantee smoothness of the coal sample passage; drilling to fill a coal sample in the sampling cylinder; introducing pressure wind into a piston passage to block a sampling cylinder opening by a plug, and sealing the sampling cylinder; and taking out a drill stem during a drilling withdrawing process, dismounting the sampling cylinder, and connecting a nozzle on the sampling cylinder with a gas desorption speed detector to analyze field gas.

Description

technical field [0001] The invention relates to a sampling device for measuring gas content and a method for using the same, in particular to a coal mine sealed sampling device and a method for using the same. Background technique [0002] Coal seam gas content is the basis for calculating gas reserves and gas emission, and is also one of the important parameters to predict the risk of coal and gas outburst, so it is very important to accurately measure coal seam gas content. There are many methods for measuring the gas content of coal seams, mainly including the coal core desorption method for exploration drilling, the coal cuttings desorption method for drilling in the working face, the gas content coefficient method and the high-pressure adsorption method. Among them, the desorption method of drilling coal cuttings in the working face is one of the commonly used determination methods. [0003] When drilling with a coal electric drill, the coal chips are discharged along ...

AI Technical Summary

Problems solved by technology

[0003] When drilling with a coal electric drill, the coal chips are discharged along the drill hole along with the drill pipe, and then the coal sample is collected with the coal sample tank, and then the gas analysis is carried out on site; this sampling method will make the deep and shallow parts of the drill hole The coal chips are discharged together, so the coal samples taken cannot be guaranteed to come from the raw coal at the design depth, resulting in inaccurate measurement

When drilling through layers, the drilling depth is very large, and the discharge process of the coal sample will be very long, resulting in a long exposure time of the coal sample, which will also lead to inaccurate measurement

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