Experimental verification of formulas for calculating natural mine draft

Abstract

"In connection with the increase in the depth of development, reaching, in particular, 1000-1200 m in a number of Donbass mines, interest in the issue of natural draft is growing, especially in mines with high temperatures. Natural draft is also important from the point of view of energy conservation. For ventilation of deep mines, fans with a capacity of up to 300-400 m3/sec with an annual power consumption of about 20-30 million kWh will be installed. With such enormous energy resources required for ventilation, taking into account the depression of natural draft when choosing fans will save significant funds for the national economy. Natural draft is of particular importance when ventilating mines of metal mines located in mountainous areas. Many of them, even large ones, are ventilated exclusively by natural draft. Thus, according to measurements in January 1947, at one of the mines of the Soviet Union, with a depression of natural draft of 12.5 mm H2O in winter, 2000 m3/min of air was supplied, which fully ensured the normal operation of the mine. From the above it follows that the question of natural draft in mines is of great practical interest and its correct calculation has considerable production significance.