0183;The results shows that dust concentration at the quarry site was quite high on the average 51.56 mg/m 3 , when compared with the limit 10 mg/m 3 and the study revealed that the crushing plant had[
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0183;In addition, the profile of trace metal concentrations in non-exhaust particulate matter is unique for every region and varies based on parameters such as traffic volume and pattern, vehicle fleet characteristics, driving and traffic patterns and climate and geology of the region (Omstedt et al., 2005; Amato et al., 2011a, b; Duong and Lee, 2011).[سؤال
0183;In the high-concentration dust-polluted area of the non-mining area, those with the sizes of over 12 μm account for about 40% of the particle group. As the dust density and inspiratory airflow volume increased, the deposition fraction of small dust particles (<1μm) in the upper airway slightly changed, and most of them escaped to the lung[سؤال
0183;It is known that pollutants released from industrial production are usually of high concentration but small volume at first, which is continuously diluted by ambient air in the process of diffusion/convention movement, and the volume of pollutants increases rapidly. wedge-shaped LVHV exhaust nozzle removing dust from a stationary grinding&سؤال
0183;Excessive dust concentration caused serious environmental pollution and posed a threat to the safety of mine production and the physical health of mine workers [5, 6].Especially, the respirable dust with particle size <5 μm was characterized by high dispersion, small particle size, large specific surface area, strong adsorption capacity, and difficult sedimentation.[سؤال
0183;When the forced-to-exhaust ratio was 0.8, the wall-attached swirling showed the best dust control effect, the concentration of both the full dust and the respiratory dust around the driver was theFlow balance over crusher bin To quantify the airflow entrained into and displaced by the tipped material from the crusher feed bin through volume displacement and shear induced flow, a virtual boundary was defined across the top of the crusher opening across which the volume flow rate of air and the material flow rate could be evaluated
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0183;To obtain the optimal dust-exhausting airflow volume on the premise that the gas concentration in the fully mechanized caving face of high-gas coal mine can be fully diluted to the safe range, gas[سؤال
0183;The dust source point in the coal-breaking operation prolonged activities generate substantial dust, diminished the air quality at the tunneling face. This study focuses on the pneumatic vortex[سؤال
0183;Low speed conveyors of generous width, adequate exhaust volumes at all ore transfer locations, large hoods and good conveyor skirting have made the Urad underground crusher dust control operations very satisfactory. Good maintenance and clean-up of the crusher facilities have made a clean working area with very low dust exposure.&سؤال
0183;The micropore volume and surface area obtained by CO 2 sorption are much higher than the macro-/mesopore volume and surface area obtained by N 2 sorption. However, pore volume and surface area measured by CO 2 varied with different coal particle sizes in previous studies (Hu et al., 2019, Jin et al., 2016, Mastalerz et al., 2017). The reason[سؤال
0183;When the air suction volume was 600 m 3 /min, the high-concentration dust area basically disappeared. By increasing the air volume ratio to 1:1.5, the dust concentration in the original high-concentration dust area of the sidewalk space was basically lower than 172 mg/m 3. When the side opening of the dust exhaust duct for suction (SO), the[سؤال
0183;According to the measurement results, the dust concentration can reach up to1300–1500 mg/m 3 when no dust-proof measures were applied in the mechanized The forced-to-exhaust air volume ratio was set to a common ratio of 0.8 in the application site when the structure of wall-attached swirling air flow field in mechanized excavation face[سؤال
0183;Based on the theory of gas-solid two-phase flow, Zhang et al. [11] numerically simulated the dust mass concentration in the belt conveyor roadway with the CFD discrete phase model, and proposed[سؤال
0183;The reported mean concentrations ranged from 0.64 [60] [57,60,66,74,79,89,96,99,106,107], with the highest concentrations generally occurring in winter and the lowest concentrations in summer.[سؤال
0183;When the duration of idling is longer than 10 s the engine consumes more fuel compared with restarting it.The fuel consumed during 5 miles of driving is equivalent to just 10 min idling and 10 min of idling per day will consume more than 27 gal of fuel per year.Idling fuel consumption is estimated to be approximately 0.8–2 billion gallons per year [12], [18].[سؤال
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Stone crusher units generate a considerable amount of micro-fine and airborne dust particles at the source which causes detrimental effects on people and the environment including flora and fauna. These rock fines contain minor to traces of elements Stone crusher units generate a considerable amount of micro-fine and airborne dust particles
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0183;Notably, the dust concentration on the right side of the tunnel decreased gradually with the increase of the air volume of the dust removal fan: when the air volume of the dust removal fan was 400 m 3 /min, the dust concentration on the right side of the tunnel was < 200 mg/m 3. An increase of the air volume could hence effectively reduce the[سؤال0183;Local exhaust ventilation systems are the most effective – yet power-consuming – method of capturing contaminants. Shaping of the ventilation ductwork elements is an approach that is actively[سؤال
0183;The PM 2.5 concentrations for both market locations ranged between 1,269.3 and 651.7 μg/m 3, while PM 10 concentrations were between 1,048.2 and 818.1 μg/m 3.The recorded concentrations exceeded the World Health Organization guideline limit of 50 μg/m 3 and 25 μg/m 3 for PM 2.5 and PM 10, respectively.As compared with control group (2.1 L), significantly[سؤال
0183;Dust Control Handbook for Industrial Minerals Mining and Processing Andrew B. Cecala, Andrew D. O’Brien, Joseph Schall, Jay F. Colinet, William R. Fox, Exhaust Hood Placed around Bag Loading Nozzles.. 166. Exhaust Hoppers (Below Entire Fill Station)[سؤال
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An industrial cyclone dust collector or cyclone dust filter, industrial cyclone separator, dust collector cyclone separator, is one of the most important dust collection devices just like baghouse dust collector, ESP electrostatic precipitator in the cement production line. It is mainly used in the raw material crushing and clinker production systems of cement plant to collect and remove the
[سؤال
0183;The necessary motor vehicle exhaust control measures were proposed. Keywords: Motor vehicle exhaust, Ambient air quality, Control measures 1 INTRODUCTION weight of vehicles, Chinese motor vehicles can be divided into four categories: light, medium, heavy and motorcycle. Motor vehicle exhaust contains more than 200 kinds of compounds Zhu[سؤال0183;The level of dust concentration at the disintegration work station is included in the hazardous category based on the Decree of the Head of the Environmental Impact Management Agency No. 107 of[سؤال0183;In all the crusher units the concentration of SPM were much more than the permissible standard i.e., 500 μg/m3, where as 100m away the concentration level fall down and were within the norm.[سؤال0183;When the air volume ratio is 2.0, a large amount of dust migrates to the rear of the tunnel, and the dust concentration in the swirl airflow distribution area is about 12 mg/m 3. When the air volume ratio is 1.33, the dust concentration decreases to about 3 mg/m 3. When the air volume ratio is 0.67–1.0, dust can be effectively controlled in[سؤال
0183;The concentrations of total PAHs in street dust ranged between 1890 and 17,070 ng/g (dry weight), with an average of 7460 ng/g, whereas the concentrations of total PAHs in surface soil varied&سؤال
0183;Meanwhile, a dust concentration prediction model based on LSTM neural network is established. The results show that the dust concentration of the open-pit mine is high in March, November and the[سؤال
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The average respirable grinding dust concentration decreased from 7.73 mg/m3 with the LEV off to 4.87 mg/m3 with the LEV on, a mean dust generation reduc-tion of about 37%. From the dust concentration and the chamber volume, the generation rate of respirable grind-ing dust was assumed to be about 1.3 mg/min when a 10
[سؤال
0183;To study the impact of COVID-19 emission reduction on dust aerosols and marine chlorophyll-a (Chl-a) concentration, we selected two similar dust processes from the COVID-19 period (10–15 March 2020) and the non-COVID-19 period (15–20 March 2019) using the Euclidean distance calculation method in combination with the HYSPLIT model and[سؤال
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In the first, ground-based PM2.5 concentrations from 23 stations of the Air Quality Control Company and Merra-2 PM2.5 components concentrations, Merra-2 PM2.5 concentrations, and aerosol optical
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