An underground gasification method for steeply inclined coal seams with a dip angle greater than 70° and a coal thickness less than 5m

Abstract

The invention discloses an in-situ underground gasification method for coal seams with a coal seam dip angle greater than 70° and a coal seam thickness less than 5 m; Arrangement of gasification pipeline and ignition device, underground gasification operation and other steps. The present invention drills and excavates the underground coal seam through the method of underground gasification, transforms the area to be mined into multiple coal gasifiers, and reduces a series of complicated problems caused by the huge inclination angle of the coal seam in traditional mechanized coal mining. The risk of the process and operation and the waste of coal resources, and the drilling technology can minimize the process of personnel going down the well, so as to achieve automatic coal mining; at the same time, through reasonable pipeline layout, the limitation of the coal seam dip angle caused by the underground gasification in the past has been improved to the greatest extent. It provides a new option for the mining method of steeply inclined coal seams with an inclination angle greater than 70° in the future.

Description

technical field [0001] The invention relates to the technical field of steeply inclined thick coal seam mining, in particular to an underground gasification method for steeply inclined coal seams with an inclination angle greater than 70° and a coal thickness less than 5m. Background technique [0002] The mining of steeply inclined coal seams has always been a difficult problem in mining technology. The reserves of steeply inclined coal seams account for 4% of my country's total coal reserves, accounting for a large proportion of my country's coal energy mining. Although in recent years with the continuous progress of mechanized coal mining With the continuous development of equipment, the existing mining methods have gradually been able to adapt to the harsh mining conditions of large dip angles. It will inevitably cause a series of related problems such as bracket pressing, collapse and slippage, difficulty in moving large-scale mining equipment, and waste of a large number...

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Problems solved by technology

[0002] The mining of steeply inclined coal seams has always been a difficult problem in mining technology. The reserves of steeply inclined coal seams account for 4% of my country's total coal reserves, accounting for a large proportion of my country's coal energy mining. Although in recent years with the continuous progress of mechanized coal mining With the continuous development of equipment, the existing mining methods have gradually been able to adapt to the harsh mining conditions of large dip angles. It will inevitably cause a series of related problems such as bracket pressing, collapse and slippage, difficulty in moving large-scale mining equipment, and waste of a large number of coal pillars, which will bring huge economic waste to the production of the entire mine. At the same time, this type of process is still Mining workers need to go underground to carry out support, gas drainage and other work. Due to the characteristics of high gas and high mine pressure in such mines, it will also pose a huge threat to the personal safety of workers

[0003] As a coal mining method that has developed rapidly in recent years, underground gasification technology seems to be an efficient, economical and safe mining method. Many mining areas at home and abroad have begun to explore coal underground in-situ gasification mining. The formation of a gasifier can be used to recover coal resources that cannot be mined manually or uneconomically, reducing the waste of mechanized mining, and can also be used for gasification mining of the entire coal field, realizing underground unmanned operation and ensuring the production process However, due to the harshness of its gasification conditions, corresponding drilling and pipeline arrangements must be made to deal with different coal seam dip angles. In the current research, underground gasification is mostly suitable for near-horizontal coal seams, mainly for The inclination angle is also between 0° and 70°. The main reason is that when the inclination angle of the coal seam is too large, it will be very difficult to drill holes, and because the angle between the gas well and the gas channel is too small, drilling accidents will easily occur

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