Blowing and Spraying Cooperative Dust Removal Technology for Clean Environment in Large Mechanized Coal Mines:Take Yufeng Coal Mine as an Example
To reduce dust pollution in fully mechanized working surfaces,a blowing and spra-ying cooperative dust collector on hydraulic support was developed.The high-speed airflow in the same direction as the spray of the dust collector could increase the effective range of dust remov-al,and the high-quality spray and air curtain could effectively improve the dust removal efficien-cy.Based on the local model of full-scale fully mechanized mining faces,the numerical simulation of the spraying process of the blowing and spraying cooperative dust collector was carried out.The results showed that,when turning off the hydraulic motor,the spray pressure increased from 2 MPa to 5 MPa and the coverage area of the high-quality spray field in section Q(mass con-centration＞10 g/m3)rapidly increased from 3.62％(2 MPa)to 32.47％(5 MPa);when turning on the hydraulic motor,the coverage area increased to 85.6％,indicating the great increase of the effective coverage area on the fully mechanized mining face under the action of high-speed airflow.Field application showed that,after the startup of the blowing and spraying collaborative dust collector of the front and rear drum of the shearer,the mass concentration of respirable dust at the driver's position dropped to 19.7 mg/m3,the dust reduction rate was 90.3％,with a good dust removal effect.
blowing and spraying cooperative dust collectorrespirable dustnumerical simu-lation
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