Abstract
An enclosed cyclone passageway (ECP) dust-collecting fan is discussed. The ECP fan separates dust by centrifugal force originating from a driven spiral airflow, and its design takes the constraints of Chinese underground coal mines into consideration. Using the force equilibrium law, a general equation for dust removal in the centrifugal dust removal section (CDRS) of the ECP fan is deduced. This general equation is simplified using the CDRS structure and the fan operating parameters and is analysed numerically. The attractive results show that increases in the airflow rate of the fan, the structural ratio of the ECPs and the radius of the extended axis can improve the dust removal performance of the CDRS. Furthermore, the effects of the structural ratio and the radius on dust removal dominate over that of the flow rate, and the effect of the structural ratio is more significant than that of the radius.
Highlights
Overexposure to airborne respirable dust can cause disabling, even fatal, respiratory disease in mineworkers
The enclosed cyclone passageway (ECP) fan separates dust by centrifugal force originating from a driven spiral airflow, and its design takes the constraints of Chinese underground coal mines into consideration
The attractive results show that increases in the airflow rate of the fan, the structural ratio of the ECPs and the radius of the extended axis can improve the dust removal performance of the centrifugal dust removal section (CDRS)
Summary
Overexposure to airborne respirable dust can cause disabling, even fatal, respiratory disease in mineworkers. In Germany, fibre bag precipitators are usually adopted in underground coal mines because of their high dust collection efficiency The performance of the dust collectors that are currently used in these Chinese mines is poor in a number of aspects: their efficiency of dust removal is low (about 80 %), their dewatering rate is low (less than 85 %) and the operating resistance is high (more than 2,200 Pa), and, even though they are smaller than the advanced precipitators used elsewhere, they are still too large (longer than 10 m or wider than 2.5 m) and in huge weight. To improve mine air quality and dust collection performance, an enclosed cyclone passageway (ECP) dust-collecting fan has been designed and developed This is a novel dustcollecting fan, which separates dust by the centrifugal force exerted by a driven spiral airflow.
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