A method for controlling hydrogen sulfide in coal seams by dynamic alkali injection

Abstract

The invention belongs to the technical field of coal mine exploitation, and particularly relates to a method for controlling coal bed sulfuretted hydrogen in a dynamic alkali injection mode. Firstly, the dynamic gushing rule of the sulfuretted hydrogen of a coal mine exploitation work face is monitored, the alkali injection amount needed for control over the sulfuretted hydrogen is calculated according to the gushing amount of the sulfuretted hydrogen, an alkali injection drilling hole is constructed on a vertical roadway coal wall through a drilling machine, the hole is sealed through a capsule hole packer, alkali liquid is injected into the drilled hole through a grouting pump in a dynamic pressure pulse mode, and the alkali injection pressure is 3-6 MPa. The alkali injection amount is determined according to the content of the sulfuretted hydrogen in per ton of coal in a regional coal bed, the amount balance of matter for chemical reaction and the effective influence range of alkali injected into the drilled hole, after alkali injection is finished and when a coal cutter recovers the coal bed in the alkali injection area, the gushing condition of the sulfuretted hydrogen in the recovery process of the coal bed is monitored in real time, the amount of the injected alkali is adjusted, and the subsequent coal bed drilled hole alkali injection is carried out. According to the method, the alkali is injected into the drilled hole in the coal bed to neutralize the sulfuretted hydrogen in the coal bed, the content of the sulfuretted hydrogen in the coal bed is reduced, the underground operation environment is improved, the health of coal exploitation workers is protected, and the operation efficiency of the workers is improved.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for controlling hydrogen sulfide in coal seams by dynamic alkali injection. Background technique [0002] Hydrogen sulfide is one of the poisonous and harmful gases in coal mines. When the wind current concentration reaches 100-150ppm, severe poisoning symptoms will appear, and when it reaches 700-1000ppm, it will cause death within a few seconds. With the growth of the national economy, the demand for coal resources is increasing day by day. In recent years, the scope of coal mining has been expanding and the mining depth has also increased year by year. There are also more and more mines with abnormal hydrogen sulfide outflow. The mines out of the mine began to detect the abnormal emission of hydrogen sulfide, and the intensity of the emission of hydrogen sulfide in the mines with hazards showed an increasing trend, which seriously affected the developm...

AI Technical Summary

Problems solved by technology

At present, the existing hydrogen sulfide treatment methods in underground coal mines mainly include treatment measures such as increasing the air volume of the working face, spraying soda lime, shielding water curtain, drilling and injecting alkali in the working face, and some monitoring and protection measures. Although some results have been achieved, but The effect is not ideal, and the technical parameters of the corresponding technology lack scientific theoretical basis. Therefore, it is urgent to study effective hydrogen sulfide treatment methods to reduce or eliminate the hazard of hydrogen sulfide in mines.

Images