A new type of fixed-point sealed sampling device was developed to address the issues of low reliability,low accuracy,poor sealing of the sampling port opening and closing device,and low success rate in the in-situ coal sample ball valve fixed-point sealed sampling technology.The closed port structure adopts a normally closed type to solve the problem of coal sample contamination,with small size,easy operation,and high stability.The on-site industrial comparative verification test results showed that the sampling volume of the long borehole normally closed fixed-point closed sampling device was greater than 400 g,and the variation of the cylinder pressure within 24 hours of sampling was not more than 5％.The gas parameter measurement data is accurate and superior to the SDQ sampling device.It can provide data support for the overall evaluation of the"two four in one"gas treatment in large areas and has good social and economic benefits.
关键词
长钻孔/常闭式/密闭取样/瓦斯参数测定/验证试验
Key words
long borehole/normally closed/closed sampling/gas parameter measurement/verification test
维普
万方数据