Coal seam air permeability measuring device

• Main Authors: CAO TENGFEI, HAO YUANWEI, YANG WEI, BI BO, CHEN BENLIANG, YANG YANG, TONG QIANXIAN, YE CHUNHUI, ZHOU TAO
• Format: Patent
• Language: Chinese; English
• Published: 04.11.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The utility model discloses a coal seam air permeability measuring device which comprises a four-way valve, an extraction pipeline and a gas-water separation tank, the input end of the four-way valve is connected with a test drill hole, the first output end and the second output end of the four-way valve are connected with the extraction pipeline and the gas-water separation tank respectively, and control valves are arranged at the joints of the extraction pipeline and the gas-water separation tank. And the extraction pipeline is connected with an external extraction machine. According to the utility model, one output end of the four-way valve is connected with the extraction pipeline, and the water-gas mixture in the test drill hole is extracted through the external extraction machine, so that a pressure relief pipeline is formed, the gas discharge time of the test drill hole is shortened, the gas permeability measurement time of the coal seam is further shortened, and gas overrun caused by gas discharge to