Settling, isolating and removing integrated dust prevention method of fully mechanized excavation face

Abstract

The invention relates to a settling, isolating and removing integrated dust prevention method of a fully mechanized excavation face, and is applicable to dust prevention and control of a coal mine underground fully mechanized excavation face. The method comprises the steps that: a foam generator is installed on a fully-mechanized roadheader, a pneumatic dedusting fan is arranged at one side of a laneway, and a wall attaching wind drum is installed at the front end of a pressed-in type wind drum; when the fully-mechanized roadheader works, the foam generator is operated to prepare foam, and the foam is sprayed by a spraying head to a dust source at the cutting part of the fully-mechanized roadheader so as to rapidly settle the dust; the axial air flow in the pressed-in type wind drum is changed by the wall attaching wind drum into a spiral type air flow and then sprayed, so as to prevent the air flow from directly blowing to the foam spraying region to influence the foam track; an air curtain dust isolating region is formed in front of the driver of the fully-mechanized roadheader, so as to effectively prevent dust from diffusing out; and the residual dust in the dust isolating region is removed by starting the pneumatic dedusting fan. According to the invention, foam dust settling, air curtain dust isolating and pneumatic fan dedusting are organically integrated, thus the dust prevention effect of the fully mechanized excavation face is significantly improved, the potential safety hazard brought by using of an electric dedusting fan is avoided, and the method has wide practicability.

Description

technical field [0001] The invention relates to an underground dust control technology in coal mines, in particular to a dust prevention method integrating lowering, isolation and removal in fully mechanized excavation working faces. Background technique [0002] The dust produced when the fully mechanized excavation machine cuts coal and rock accounts for about 90% of the total dust production of the fully mechanized excavation working face. Therefore, effective control of the dust hazard in the mechanized excavation machine cutting link is the top priority of the dust prevention work of the fully mechanized excavation working face. heavy. At present, there are mainly two methods to prevent and control the cutting dust of fully mechanized excavators. One is to spray dust inside and outside the roadheader. When it is suppressed, the external spray is sprayed into the dust-laden air through the nozzle installed outside the cutting head of the roadheader to capture the floati...

AI Technical Summary

Problems solved by technology

At present, there are mainly two methods to prevent and control the cutting dust of fully mechanized excavators. One is to spray dust inside and outside the roadheader. When it is suppressed, the external spray is sprayed into the dust-laden air through the nozzle installed outside the cutting head of the roadheader to capture the floating dust in the air. Greatly, resulting in low dust capture rate of water spray, and extremely poor capture ability of respirable dust

The other is dust removal by electric dust removal fan, that is, the dust removal fan is used to form a negative pressure at the dust source so that the dusty air enters the attached dust collector from the dust collection hood through the dust suction duct for purification treatment. This method has a higher dust removal efficiency , but there are potential electrical safety hazards. For the tunneling face with gas gushing out, gas and coal dust explosion accidents may be caused by electrical failure. Therefore, the application in mines with high gas, coal and gas outbursts is greatly restricted. The air volume and effective suction range are limited, and the effect of purifying high-concentration dust alone is poor. In addition, it is easy to cause secondary dust when the dust-laden airflow is not controlled.

At present, there are many ways to improve the efficiency of dust capture by water, such as magnetized water dust reduction, wetting agent dust reduction, foam dust reduction, etc. In practice, the more economical and effective method is foam dust reduction, which is to mix water and foaming agent in a certain proportion Foaming, through foam covering and blocking the dust source, the dust can be moistened and suppressed, but in the application of the fully mechanized excavation face, it is found that the spray trajectory of the foam is easily affected by the axial ventilation of the face and cannot effectively wrap the cutting head , and due to the high concentration and high dispersion of flour dust in fully mechanized excavation, it is easy to spread outward, so the effect of foam dust reduction is not ideal

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