Development and test of turbine generator while drilling in underground coal mines

In view of the limited power supply capacity of the explosion-proof computer at the borehole and the need to lift the drill to replace the battery for the rechargeable battery pack, a turbine power generation device for underground coal mines was developed. Based on the overall structural design of the turbine power generator, the number of turbine and guide wheel blades and the spiral angle were optimized, and a main control circuit was developed with a self-shutdown and recovery function of the battery unit. The performance test of the turbine power generator shows that the power generation capacity of the turbine power generator can reach 13 W when the flushing fluid flow rate is maintained at 390 L/min, and when the flow of electric washing liquid is kept at 200 L/min, the charging power of the turbine generator unit is stable and the charging process is reliable during the charging process of 300 min; after nearly 3 hours of temperature rise performance test, the temperature of the turbine generator was stable around 41 ℃, which meets the requirements of the underground safety regulations.