Factors Defining Value and Direction of Thermal Drop Between Mine Shafts and Impact of General Mine Natural Draft on Ventilation Process of Underground Mining Companies

摘要

The article specifies measuring data of air parameters and their volume flow in the shafts and on the surface, collected in BKPRU-2 (Berezniki potash plant and mine 2) (《Uralkali》 PJSC) in the normal operation mode, after shutdown of the main mine fan (MMF) and within several hours. As a result of the test it has been established that thermal drop between the mine shafts is active continuously regardless of the MMF operation mode or other draught sources. Also it has been discovered that depth of the mine shafts has no impact on thermal drop value. By the same difference of shaft elevation marks and parameters of outer air between the shafts, by their different depth, thermal drop of the same value will be active. The value of the general mine natural draft defined as an algebraic sum of thermal drop values between the shafts depends only on the difference of temperature and pressure of outer air and air in the shaft bottoms, on condition of shutdown of the air handling system (unit-heaters, air conditioning systems).