On-site sealed sampling device for coal bed gas

Abstract

The invention discloses an on-site sealed sampling device for coal bed gas. The device comprises a hollow long rod piece, wherein the outer circumference of the long rod piece is provided with a spiral convex edge; a coal storage cabin, a closed cabin, a transmission cabin and a power and control cabin are arranged in the long rod piece from front to back respectively; the closed cabin is provided with a coal inlet; a reciprocating push and pull mechanism is arranged in the transmission cabin; a micro power speed reducing motor for providing power for the reciprocating push and pull mechanismis arranged in the power and control cabin; the front end of the reciprocating push and pull mechanism is in transmission connection with a piston sliding sleeve device for opening and closing the coal inlet; and the front end of the coal storage cabin is provided with a gas resolution hole. The device is mainly used for a sampling link before the process of measuring the content of the gas in a laboratory, has high practical value and is easy to popularize and apply, the on-site sealed acquisition of a coal sample and the gas is realized, underground resolution is not needed, loss amount is not required to be calculated in the process of measuring the content of the gas, and reliable basic parameters are provided for related fields of coal mine gas prevention and control and the like.

Description

technical field [0001] The invention belongs to the technical field of underground gas content measurement in coal mines, in particular to an in-situ sealed sampling device for coal seam gas. Background technique [0002] Coal seam gas content is one of the important parameters in related fields such as gas control and prevention, coal bed methane evaluation and development, and the measurement of gas content has always been an international problem in the field of gas prediction and gas control. There are two main reasons why there has been no breakthrough so far: first, coal samples cannot be collected at fixed points, and second, the amount of gas loss cannot be accurately calculated. To accurately measure the gas content, the above two requirements must be met at the same time. [0003] At present, many experts at home and abroad focus on the calculation of gas content measurement, and have established different models to simulate the process of gas adsorption and analy...

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Problems solved by technology

[0003] At present, many experts at home and abroad focus on the calculation of gas content measurement, and have established different models to simulate the process of gas adsorption and analysis, and thus obtained a series of calculation formulas to calculate the gas content in the measurement. The amount of loss; because the adsorption and desorption of gas is a process of chemical, physical and complex environmental conditions, these models are all established in the laboratory. Factors such as single conditions and simple models make it impossible to fully meet the requirements of coal seam gas. Actual Analysis

Therefore, no one person or a device can accurately measure the gas content so far

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