Coal seam low-temperature fixed-point frozen sampling device and use method thereof

Abstract

The invention discloses a coal seam low-temperature fixed-point frozen sampling device and a use method thereof. The coal seam low-temperature fixed-point frozen sampling device comprises a through hole coring bit. The outer wall and the inner wall of the right end of the through hole coring bit are connected with a sampling drill pipe and a frozen low-temperature sample storing device correspondingly. The right end of the sampling drill pipe is connected with a drill pipe adapter. A dry ice cooling layer and a heat-insulation heat-preservation layer are arranged between the sampling drill pipe and the frozen low-temperature sample storing device. According to the sampling method, a drilled hole is constructed to the designed depth, the coal seam low-temperature fixed-point frozen sampling device is put into the bottom of the drilled hole and pushed towards a coal seam, a collected coal sample pushes a round baffle to enter an inner cavity of a low-temperature sample storing barrel and is cooled rapidly, meanwhile, water is supplied into a frozen sealed barrel, the coal sample mixed with water in the frozen sealed barrel is frozen rapidly in a low-temperature environment, dissipation of gas is lowered, a sealing bolt is detached after a drill is retreated, the internal coal sample is rapidly poured out by pushing the round baffle with a metal guide rod, and the coal sample is transferred into a coal sample tank to be sealed and stored. The coal seam low-temperature fixed-point frozen sampling device and the use method thereof realize low-temperature fixed-point frozen sampling, can effectively reduce the loss of gas in the sampling process, and are beneficial to improving the accuracy of the measured gas content of the coal seam.

Description

technical field [0001] The invention belongs to the technical field of mine gas prevention and control, and in particular relates to a coal seam low-temperature fixed-point ice-sealing sampling device and a use method thereof. Background technique [0002] According to statistics, in 2013, there were 59 coal mine gas accidents across the country, and 348 people died, accounting for 10.0% and 33.2% of the total number of coal mine accidents and 33.2% of deaths respectively. Gas content is an indispensable parameter for the assessment of coal mine gas risk, the prevention and control of gas disasters, and the development and utilization of gas resources in my country. Accurate measurement of gas content in coal seams is an important prerequisite for ensuring safe production in coal mines. Regulations on Gas Outburst, the gas content is used as the main indicator for the regional prediction of coal seam gas outburst risk and the effect test of regional risk prevention measures, ...

AI Technical Summary

Problems solved by technology

However, limited by the sampling environment such as coal seam geological conditions and sampling drilling depth, the development of sampling tools lags behind theoretical research. There are many types of sampling devices, but most of them are sampling tools under normal temperature conditions. A previously disclosed patent also uses However, the low temperature method of the sampling device is to connect the cooling box at the end of the guide rod. The structure is complicated and not compact enough, the operation is inconvenient, the cooling effect is not ideal, and the accuracy of the gas content measurement is affected.

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