Effect of Temperature on Permeability and Mechanical Characteristics of Lignite

Figure 3

Schematic diagram of high-temperature triaxial permeability testing system: () pressure gauge, () nitrogen tank, () support frame, () steel tube, () valve, () heating wire, () muff, () specimen, () thermocouple, () graphite packing, () temperature and pressure controller, () oil pump, and () measuring equipment of gas flow.