Abstract
Dust protection is a safety guarantee of heading face. The previous model of air curtain research was ideal, and the dust removal effect was rarely studied in the actual dust-producing face. This paper presents a method of air curtain dust removal (ACDR) in the actual heading face. The author designed an air curtain dust removal device (ACDRD). The law of total dust concentration, respiratory dust concentration, and respiratory dust ratio is obtained. The minimum outlet airflow velocity is analyzed using the flat-plane injection theory. The effect of the exhaust fan placement on the dust removal effectiveness is examined. Research indicates the following: The airflow speed at the upper, left, and right sides of the ∩-shaped slot is 17.39 m/s, 12.04 m/s, and 13.66 m/s, respectively. The minimum dust removal speed of the air curtain is 5.48 m/s. The total dust concentration is the highest in the spot of roadheader operator, and the concentration of respiratory dust decreases sharply within 20 m. When the indentation air duct is 2.1 m away from the base plate, the dust-proof effect is better. The results can provide theoretical bases and methods for air curtain analysis of the heading face.
Highlights
Coal mine dust is one of the main hidden dangers restricting safe production
Air curtain dust removal (ACDR) technology has emerged in recent years [7]
Wen Nie analyzed the effects of multidirectional air curtain dust removal on the fully mechanized heading face [14,15,16]
Summary
Coal mine dust is one of the main hidden dangers restricting safe production. In China, 90% of underground coal mines face the problem of dust concentrations exceeding the limit [1]. e distribution of mine dust has the characteristics of wide spread in space and continuity in time. After automatic high-pressure dust removal technology, the concentration of breathing dust at the driver’s spot of the roadheader reaches 100 to 150 mg/m3 [3], which is more than 30 times the prescribed standard [4]. Air curtain dust removal (ACDR) technology has emerged in recent years [7] It has the characteristics of transparent injection airflow, good sight of the driver, nonobstruction of transport, stable use, and so on [8, 9]. Wen Nie analyzed the effects of multidirectional air curtain dust removal on the fully mechanized heading face [14,15,16]. E airflow velocity of the air curtain fan, the structure size of the dust collector, and the dust pressure are the decisive factors influencing the dust removal effect. An ACDRD is designed, and the minimum outlet airflow velocity of the air curtain device is analyzed using the flat-plane injection theory. rough the experiment of the dust concentration of the experimental heading face, the law of total dust concentration, respiratory dust concentration, and respiratory dust ratio is obtained. e effect of the exhaust fan placement on the dust removal effectiveness is examined. is study enriches the air curtain injection mechanism in a fully mechanized heading face
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