Development and Verification of Measurement Equipment for Residual Gas Content of a Coal Sample

This paper presents the development of measurement equipment for residual gas content consisting of a cylindrical canister, a grooved rod, and a crusher, as well as a test for verifying its efficiency and crushing ratio. The equipment was designed by considering factors such as crushing mode, material type and size, sealing, empty volume inside the canister, and portability to site. Particularly by designing a rod having grooves, unlike existing rod mills, the initial crushing time was shortened. Test results showed that an average of 83 min was consumed to achieve a 96% crushing ratio, which proved the developed equipment had excellent performance for use at coalbed methane sites.