High-pressure hydrothermal solution inhibition method for coal seam

Abstract

The invention discloses a high-pressure hydrothermal solution inhibition method for a coal seam, and belongs to the technical field of fire prevention and extinguishment of a coal mine. The high-pressure hydrothermal solution inhibition method comprises the following steps: firstly, drilling a bedding layer in the coal seam; preparing a high-temperature inhibitor solution at a certain concentration by adopting a high-temperature tank; injecting the inhibitor solution into the holes drilled in the bedding layer of the coal seam at high pressure by using a high-pressure pump, and after the inhibitor solution fully reacts with coal, extracting the inhibitor solution in the holes drilled in the bedding layer, and discharging the inhibitor solution into the high-temperature tank; cyclically injecting water into the holes drilled in the bedding layer and pumping water out of the holes so as to discharge heat in the holes drilled in the bedding layer. The high-temperature inhibitor solution is injected into the drilled holes of the coal seam, so that an inhibitor can react with active groups on the surface of the coal in a high-temperature and high-pressure environment. According to the high-pressure hydrothermal solution inhibition method disclosed by the invention, the number of the active groups on the surface of the coal can be obviously decreased, and the inhibition efficiency ofthe inhibitor is further improved; occurrence of a natural disaster of the coal is effectively prevented; the high-pressure hydrothermal solution inhibition method is wide in practicability in the technical field.

Description

technical field [0001] The invention belongs to the technical field of coal mine fire prevention, and in particular relates to a method for high-pressure injection of a high-temperature inhibitor solution into a coal seam borehole to prevent spontaneous combustion of the coal seam. Background technique [0002] Coal spontaneous combustion is one of the major natural disasters faced by coal mines. The spontaneous combustion of coal will not only produce toxic and harmful gases, but also cause gas explosions, causing huge casualties and economic losses. Inhibitor fire prevention is one of the conventional fire prevention methods. Chemical inhibitors can react with the active groups in the coal, and by reducing the number of active groups on the surface of the coal, the effect of preventing spontaneous combustion of coal can be achieved. [0003] At present, when using inhibitor to prevent coal spontaneous combustion, it mainly uses normal temperature inhibitor. At normal temp...

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Problems solved by technology

[0003] At present, the use of inhibitors to prevent spontaneous combustion of coal is mainly to use normal temperature inhibitors. At room temperature, the chemical reaction between inhibitors and coal is extremely limited, and the active groups on the coal surface cannot be effectively eliminated. The inhibitory effect cannot be fully exerted

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