Toropchin O. Improved method of airing control in extraction blocks of mines with high content of methane by way of combining airing schemes and degassing parameters

Ob'ect research: air-gasdynamic processes of ventilation of extraction blocks of gas-saturated mines. The purpose of work is perfection of method of management ventilation of extraction blocks of gas-saturated mines of ranging charts of airing and parameters of degassing for the increase of mining strength security. The complex method of researches, which included, is in-process used. An analysis and generalization of scientific and technical achievements is an industry of using methods of calculation of air-gasdynamic parameters of extraction blocks in the conditions of using degassing means; imitation modeling of dissemination out-flows of air across the mine-out area of extraction blocks; approbation of job performances in a condition operating mines. The author proves, for the stage of mining an extraction pillar, conditions for and necessity to pass from direct-flow airing to the combined scheme of airing, as it gives a possibility to reduce gas saturation of the extraction blocks and, at the same time, to make lifetime of uncontrolled exhaust working longer when it reaches maximal aerodynamic resistance. It is established that in the blocks with complex control program for the air-distribution process gas-saturation estimates and ratio of degassing methods used in the total gas balance should be given by separate quasi-stationary periods while combining airing schemes and parameters of degassing. The author is the first who has shown interrelations between underground degassing device and airing practice in the extraction blocks; he also states that it is necessary to use deairing devices in ventilation systems as it creates a topological analog of combined airing for the back-flow scheme. The author proposes a method for calculating an air out-flow rate in the mined-out area caused by superposition of total depression in the mine, and vacuum gradient for the deairing devices, and this helps to choose optimal locations, number and parameters of devices that extract gas from the mined-out areas. Method for calculating out-flow rate of the air escaped through the mined-out areas in the coal mines is developed, and this method has improved degassing effectiveness by 15% with further expected economic effectiveness.