Air curtain and water mist linkage dust settling method for full mechanized workface

Abstract

The invention provides an air curtain and water mist linkage dust settling method for a full mechanized workface, which is applicable to dust control in a full mechanized workface in an underground coal mine. According to the invention, an air curtain generator arranged in a no man's zone located between a head-on workface and a driver of a heading machine is started to form an air curtain, and an enclosed area is formed between the head-on workface and the air curtain, which prevents dust from spreading outwards; simultaneously, water mist is injected into the formed enclosed area, and the water mist rapidly disperses in the enclosed area to capture dust in a moistened settling enclosed zone, thereby realizing air curtain and water mist linkage dust settling for the full mechanized workface. The method has the advantages of a simple process, convenient operation, small water consumption, low utilization cost and high dust settling efficiency; the water mist injected into the enclosed area can wet the surface of coal rock mass in head-on full mechanized workface, which enables gas and dust explosion induced by sparks generated in cutting of coal rocks to be avoided; the invention has wide practicality.

Description

technical field [0001] The invention relates to an air curtain and fine water mist linkage dust reduction method for fully mechanized excavation working faces, and is especially suitable for dust reduction of fully mechanized excavation working faces in coal mines. Background technique [0002] The fully mechanized excavation working face is one of the most important dust-generating points in coal mines. During the operation, a large amount of dust is generated, and a large amount of dust is suspended in the air, which not only reduces the visibility of the working face, but also has a great impact on the normal excavation of the roadway. The health of personnel constitutes a serious hazard. According to statistics, more than 85% of coal mine pneumoconiosis patients work in rock tunnels. Therefore, effective control of dust in the fully mechanized excavation face has very important practical significance for ensuring the physical and mental health of underground workers. ...

AI Technical Summary

Problems solved by technology

[0003] In order to control the flour dust of fully mechanized excavation, methods such as water injection into the coal seam, internal and external spraying of the roadheader, and dust extraction and purification by dust removal fans are generally used, but the dust reduction effect is not ideal due to the limitations of these methods.

For example, the coal seam water injection system and process are complex, water consumption is large, and a large number of water injection holes need to be constructed, which requires a large amount of engineering and high cost

The outlet diameter of the nozzles used for dust reduction inside and outside the roadheader is small (usually less than 4mm), and the nozzles are easily blocked during dust reduction, and the particle size of the mist is large and settles quickly, so that the contact rate between the sprayed water droplets and dust is low; In addition, due to the influence of ventilation on the excavation surface during use, a large amount of dust spreads out quickly with the wind flow, further shortening the contact time between water droplets and dust, and it is difficult to achieve the expected effect of full contact between water and dust, wetting and dust reduction; therefore, The dust suppression efficiency of the internal and external spray method is low and the utilization rate of dust suppression water is low

The effective suction range of the dust removal fan is short, it is difficult to effectively control the outward diffusion and drift of dust, the dust collection rate is low, and there are electrical safety hazards. For the excavation face with a large amount of gas gushing, there is a hidden danger of gas explosion caused by electrical leakage. ; Therefore, it is not suitable for the dust suppression of the excavation face with large gas gushing

In addition, there is currently a dust reduction method that combines the use of air curtains and dust removal fans, that is, the air curtain is used to control the dust generated on the tunneling face within a certain range, and then the dust removal fan is used to vacuum the dust in the closed area. ; This method is a dry dust reduction method. In addition to the above-mentioned defects of the dust removal fan itself, the concentration of dust and gas in the closed area is relatively high. Once the sparks are generated when cutting coal rocks, it is easy to induce coal dust and gas explosions. vicious accident