Z-shaped ventilation method and system for gob-side entry of coalface

Abstract

The invention relates to a Z-shaped ventilation method and system for a gob-side entry of a coalface. An air inlet way and an air return way of the coalface are arranged on the front side and the rear side of the coalface respectively, and the coalface is disposed by 90 degrees to form the Z-shaped ventilation system of the coalface. The air return way of the coalface is reserved by adopting pier stud materials, flexible die or high-water materials in a gob-side entry manner, after extraction of a last coalface is finished, the air return way can be reused as a part of the air inlet way, coal pillars for separating the two adjacent coalfaces are omitted, and railways or air return ways in mining areas which are adjacently arranged are reused. By the Z-shaped ventilation method and system, roadway tunneling during arrangement of the coalfaces is effectively reduced, coal recovery rate is increased, and high output and efficiency of coals are realized.

Description

Technical field [0001] The invention relates to the field of ventilation of coal mining areas and coal mining faces, in particular to a Z-type ventilation method and system for retaining lanes along goafs in coal mining faces. Background technique [0002] The ventilation system of the mining area and coal mining face is an important part of the mine ventilation system. The layout of the roadway in the mining area and coal mining face directly affects the tunneling volume and coal recovery rate of the entire mine. Choosing a reasonable mining area and coal mining face roadway layout can effectively reduce the amount of mine excavation, increase the coal recovery rate, and control the upper corners of the coal mining face and the gas concentration in the return airway, which is helpful to ensure the coal mining face and The safe and efficient production of the whole mine is of great significance. [0003] At present, U-shaped and W-shaped ventilation systems are mostly used in coal...

AI Technical Summary

Problems solved by technology

Among the coal mining face ventilation systems listed above, the U-shaped ventilation system needs to excavate the least roadways (one entry and one return, two along-trough roadways), and other coal mining faces need to excavate more than 3 along-trough roadways to form the coal mining face ventilation. system, roadway excavation and maintenance works are large; and between two adjacent coal mining faces in the same mining area (such as U-shaped, W-shaped, U+I-shaped, which is not adopted along the gob-side entry) or coal mining face Medium (such as U+L shape, partial Y shape, double U shape) need to leave unrecoverable isolated coal pillars, which reduces the coal recovery rate of the mine and causes a lot of waste of coal resources

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