The Experts below are selected from a list of 12339 Experts worldwide ranked by ideXlab platform
Michael G Gressel - One of the best experts on this subject based on the ideXlab platform.
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on the characterization of the Generation rate and size dependent crystalline silica content of the Dust from cutting fiber cement siding
Annals of Occupational Hygiene, 2016Co-Authors: Chaolong Qi, Alan Echt, Michael G GresselAbstract:A laboratory testing system was developed to systematically characterize the Dust Generation rate and size-dependent crystalline silica content when cutting or shaping silica containing materials. The tests of cutting fiber cement siding in this system verify that it provides high test repeatability, making it suitable for the targeted characterizations. The mass-based size distributions obtained from a gravimetric-based instrument and a direct reading instrument both show bimodal lognormal distributions with a larger mode around 13 µm and another mode smaller than 5 µm for the Dusts from cutting four different brands of fiber cement siding. The Generation rates of respirable Dust obtained from the two instruments are comparable, and the results from each instrument are similar for the four brands. The silica content in the airborne Dusts, however, strongly depends on the amount of silica used in the respective product. It is also observed that the silica content in the airborne Dust from cutting the four brands of fiber cement siding showed the same trend of an increase with the aerodynamic diameter of the Dust, approaching the silica content levels found in their respective bulk samples. Combining the results for both the Dust size distribution and size-dependent silica content, it is found that most of the respirable crystalline silica (RCS) resides in the Dust about 2.5 µm in aerodynamic diameter. These results would help guide the development of specific engineering control measures targeted at lowering workers’ exposure to RCS while cutting fiber cement siding. With the high repeatability using the laboratory testing system, the Dust Generation rate could then be characterized under different operating conditions, and with the deployment of various engineering control measures. This would greatly facilitate the systematic evaluation of the control effectiveness and the selection of the optimal control solutions for field trials.
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on the characterization of the Generation rate and size dependent crystalline silica content of the Dust from cutting fiber cement siding
Annals of Occupational Hygiene, 2016Co-Authors: Alan Echt, Michael G GresselAbstract:A laboratory testing system was developed to systematically characterize the Dust Generation rate and size-dependent crystalline silica content when cutting or shaping silica containing materials. The tests of cutting fiber cement siding in this system verify that it provides high test repeatability, making it suitable for the targeted characterizations. The mass-based size distributions obtained from a gravimetric-based instrument and a direct reading instrument both show bimodal lognormal distributions with a larger mode ~13 µm and another mode <5 µm for the Dusts from cutting four different brands of fiber cement siding. The Generation rates of respirable Dust obtained from the two instruments are comparable, and the results from each instrument are similar for the four brands. The silica content in the airborne Dusts, however, strongly depends on the amount of silica used in the respective product. It is also observed that the silica content in the airborne Dust from cutting the four brands of fiber cement siding showed the same trend of an increase with the aerodynamic diameter of the Dust, approaching the silica content levels found in their respective bulk samples. Combining the results for both the Dust size distribution and size-dependent silica content, it is found that most of the respirable crystalline silica (RCS) resides in the Dust ~2.5 µm in aerodynamic diameter. These results would help guide the development of specific engineering control measures targeted at lowering workers' exposure to RCS while cutting fiber cement siding. With the high repeatability using the laboratory testing system, the Dust Generation rate could then be characterized under different operating conditions, and with the deployment of various engineering control measures. This would greatly facilitate the systematic evaluation of the control effectiveness and the selection of the optimal control solutions for field trials.
Wendong Zhou - One of the best experts on this subject based on the ideXlab platform.
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an experimental investigation on the influence of coal brittleness on Dust Generation
Powder Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Yongchao QiaoAbstract:Abstract As Dust is one of the main hazards generated by coal cutting, understanding the properties of Dust Generation is essential for preventing and controlling its propagation. This paper therefore aims to investigate the influence of coal brittleness on Dust Generation. A system was devised to produce Dust and the density, uniaxial compressive strength, and Brazilian tensile strength of Dust samples were then measured. The results showed that the cumulative proportions of fine particulate matter and respirable Dust increased with brittleness, while a declining trend was observed from the mass ratio of total Dust to coal sample. B14 (half of the product of compressive and tensile strength) had the strongest correlation with the properties of Dust Generation, and accounted for more than 95% of B15 (half of the sum of compressive and tensile strength).
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the influence of pore structure of coal on characteristics of Dust Generation during the process of conical pick cutting
Powder Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Jin ZhangAbstract:Abstract To reveal the influence of pore structure of coal on the characteristics of coal Dust Generation during roadheader cutting, a self-developed coal cutting system was used to generate Dust. A low field nuclear magnetic resonance was utilized to measure the pore system of coal. Results show that the porosity had negative correlations with the cumulative proportions of both respirable Dust and fine particulate matter (PM2.5), but the positive influence on the mass ratio of Dust Generation (MRD) of total Dust and slight effect on MRD of respirable Dust and PM2.5 were observed. The correlations of the fractal dimension (Df) of pore structure on Dust Generation were inverse compared with that of porosity. The negative relationship between porosity and Df was the reason for the opposite correlations. This study can provide basic support for the estimate of Dust hazard and the development of Dust control technologies.
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the effect of geometries and cutting parameters of conical pick on the characteristics of Dust Generation experimental investigation and theoretical exploration
Fuel Processing Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Husheng YangAbstract:Abstract Understanding the characteristics of Dust Generation is the basis of effective Dust control. To reveal the influence of pick geometries and cutting parameters on the characteristics of Dust Generation during roadheader cutting, this paper conducted an experimental investigation and theoretical exploration on the effects of tip angle, attack angle and cutting speed on the cumulative proportion of small size Dust and the mass rate of Dust Generation. It was found that tip angle and attack angle considerably affected Dust Generation, whereas the effect of cutting speed could be ignored. The positive relationships between tip angle and both cumulative proportion and mass rate of Dust Generation were observed. A larger attack angle can reduce Dust Generation. The change of the cutting force and the size of the damaged zone are the fundamental reasons for the difference of Dust Generation under varying conditions. In general, the cutting process with a smaller tip angle of pick and a larger attack angle appears beneficial to abate Dust Generation. This study would enhance the fundamental understanding of coal Dust Generation, which will provide guidance for selecting suitable pick geometries and cutting parameters to ameliorate environment quality and obtain a cleaner production environment.
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the effect of coal proximate compositions on the characteristics of Dust Generation using a conical pick cutting system
Powder Technology, 2019Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Wenjie KangAbstract:Abstract To investigate the characteristics of coal Dust Generation when cut by a roadheader, a system was designed for performing cutting experiments. The aerodynamic diameter distribution of Dust was tested by a laser particle size analyzer. Correlations between the coal proximate compositions and the characteristics of Dust Generation were studied. Results showed that fixed carbon had significantly positive correlations with the cumulative proportion of respirable Dust and the rate of Dust Generation. The bonded high-density pulverized core could be responsible for reducing the correlation with fine particulate matter. The presence of moisture had inhibitory effects on Dust Generation. Volatile matter had a slightly negative influence on Dust Generation, and ash was considered to have no effect. More attention should be focused on heading faces with high fixed carbon and low moisture. This study provides essential guidance for understanding the characteristics of Dust Generation and improving Dust reduction technologies.
Alan Echt - One of the best experts on this subject based on the ideXlab platform.
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on the characterization of the Generation rate and size dependent crystalline silica content of the Dust from cutting fiber cement siding
Annals of Occupational Hygiene, 2016Co-Authors: Chaolong Qi, Alan Echt, Michael G GresselAbstract:A laboratory testing system was developed to systematically characterize the Dust Generation rate and size-dependent crystalline silica content when cutting or shaping silica containing materials. The tests of cutting fiber cement siding in this system verify that it provides high test repeatability, making it suitable for the targeted characterizations. The mass-based size distributions obtained from a gravimetric-based instrument and a direct reading instrument both show bimodal lognormal distributions with a larger mode around 13 µm and another mode smaller than 5 µm for the Dusts from cutting four different brands of fiber cement siding. The Generation rates of respirable Dust obtained from the two instruments are comparable, and the results from each instrument are similar for the four brands. The silica content in the airborne Dusts, however, strongly depends on the amount of silica used in the respective product. It is also observed that the silica content in the airborne Dust from cutting the four brands of fiber cement siding showed the same trend of an increase with the aerodynamic diameter of the Dust, approaching the silica content levels found in their respective bulk samples. Combining the results for both the Dust size distribution and size-dependent silica content, it is found that most of the respirable crystalline silica (RCS) resides in the Dust about 2.5 µm in aerodynamic diameter. These results would help guide the development of specific engineering control measures targeted at lowering workers’ exposure to RCS while cutting fiber cement siding. With the high repeatability using the laboratory testing system, the Dust Generation rate could then be characterized under different operating conditions, and with the deployment of various engineering control measures. This would greatly facilitate the systematic evaluation of the control effectiveness and the selection of the optimal control solutions for field trials.
-
on the characterization of the Generation rate and size dependent crystalline silica content of the Dust from cutting fiber cement siding
Annals of Occupational Hygiene, 2016Co-Authors: Alan Echt, Michael G GresselAbstract:A laboratory testing system was developed to systematically characterize the Dust Generation rate and size-dependent crystalline silica content when cutting or shaping silica containing materials. The tests of cutting fiber cement siding in this system verify that it provides high test repeatability, making it suitable for the targeted characterizations. The mass-based size distributions obtained from a gravimetric-based instrument and a direct reading instrument both show bimodal lognormal distributions with a larger mode ~13 µm and another mode <5 µm for the Dusts from cutting four different brands of fiber cement siding. The Generation rates of respirable Dust obtained from the two instruments are comparable, and the results from each instrument are similar for the four brands. The silica content in the airborne Dusts, however, strongly depends on the amount of silica used in the respective product. It is also observed that the silica content in the airborne Dust from cutting the four brands of fiber cement siding showed the same trend of an increase with the aerodynamic diameter of the Dust, approaching the silica content levels found in their respective bulk samples. Combining the results for both the Dust size distribution and size-dependent silica content, it is found that most of the respirable crystalline silica (RCS) resides in the Dust ~2.5 µm in aerodynamic diameter. These results would help guide the development of specific engineering control measures targeted at lowering workers' exposure to RCS while cutting fiber cement siding. With the high repeatability using the laboratory testing system, the Dust Generation rate could then be characterized under different operating conditions, and with the deployment of various engineering control measures. This would greatly facilitate the systematic evaluation of the control effectiveness and the selection of the optimal control solutions for field trials.
Hetang Wang - One of the best experts on this subject based on the ideXlab platform.
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an experimental investigation on the influence of coal brittleness on Dust Generation
Powder Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Yongchao QiaoAbstract:Abstract As Dust is one of the main hazards generated by coal cutting, understanding the properties of Dust Generation is essential for preventing and controlling its propagation. This paper therefore aims to investigate the influence of coal brittleness on Dust Generation. A system was devised to produce Dust and the density, uniaxial compressive strength, and Brazilian tensile strength of Dust samples were then measured. The results showed that the cumulative proportions of fine particulate matter and respirable Dust increased with brittleness, while a declining trend was observed from the mass ratio of total Dust to coal sample. B14 (half of the product of compressive and tensile strength) had the strongest correlation with the properties of Dust Generation, and accounted for more than 95% of B15 (half of the sum of compressive and tensile strength).
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the influence of pore structure of coal on characteristics of Dust Generation during the process of conical pick cutting
Powder Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Jin ZhangAbstract:Abstract To reveal the influence of pore structure of coal on the characteristics of coal Dust Generation during roadheader cutting, a self-developed coal cutting system was used to generate Dust. A low field nuclear magnetic resonance was utilized to measure the pore system of coal. Results show that the porosity had negative correlations with the cumulative proportions of both respirable Dust and fine particulate matter (PM2.5), but the positive influence on the mass ratio of Dust Generation (MRD) of total Dust and slight effect on MRD of respirable Dust and PM2.5 were observed. The correlations of the fractal dimension (Df) of pore structure on Dust Generation were inverse compared with that of porosity. The negative relationship between porosity and Df was the reason for the opposite correlations. This study can provide basic support for the estimate of Dust hazard and the development of Dust control technologies.
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the effect of geometries and cutting parameters of conical pick on the characteristics of Dust Generation experimental investigation and theoretical exploration
Fuel Processing Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Husheng YangAbstract:Abstract Understanding the characteristics of Dust Generation is the basis of effective Dust control. To reveal the influence of pick geometries and cutting parameters on the characteristics of Dust Generation during roadheader cutting, this paper conducted an experimental investigation and theoretical exploration on the effects of tip angle, attack angle and cutting speed on the cumulative proportion of small size Dust and the mass rate of Dust Generation. It was found that tip angle and attack angle considerably affected Dust Generation, whereas the effect of cutting speed could be ignored. The positive relationships between tip angle and both cumulative proportion and mass rate of Dust Generation were observed. A larger attack angle can reduce Dust Generation. The change of the cutting force and the size of the damaged zone are the fundamental reasons for the difference of Dust Generation under varying conditions. In general, the cutting process with a smaller tip angle of pick and a larger attack angle appears beneficial to abate Dust Generation. This study would enhance the fundamental understanding of coal Dust Generation, which will provide guidance for selecting suitable pick geometries and cutting parameters to ameliorate environment quality and obtain a cleaner production environment.
-
the effect of coal proximate compositions on the characteristics of Dust Generation using a conical pick cutting system
Powder Technology, 2019Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Wenjie KangAbstract:Abstract To investigate the characteristics of coal Dust Generation when cut by a roadheader, a system was designed for performing cutting experiments. The aerodynamic diameter distribution of Dust was tested by a laser particle size analyzer. Correlations between the coal proximate compositions and the characteristics of Dust Generation were studied. Results showed that fixed carbon had significantly positive correlations with the cumulative proportion of respirable Dust and the rate of Dust Generation. The bonded high-density pulverized core could be responsible for reducing the correlation with fine particulate matter. The presence of moisture had inhibitory effects on Dust Generation. Volatile matter had a slightly negative influence on Dust Generation, and ash was considered to have no effect. More attention should be focused on heading faces with high fixed carbon and low moisture. This study provides essential guidance for understanding the characteristics of Dust Generation and improving Dust reduction technologies.
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application of foam to suppress rock Dust in a large cross section rock roadway driven with roadheader
Advanced Powder Technology, 2013Co-Authors: Hetang Wang, Deming Wang, Wanxing Ren, Fangwei Han, Yikun ZhangAbstract:Abstract The greatest source of rock Dust on rock roadway heading face is the roadheader. Overexposure to respirable rock Dust can be a serious health hazard to roadheader operators and other workers. One of the rock roadways, named North Belt Main Entry (NBME), belonging to the underground coal mine Zhuxianzhuang, located in east China, is being driven by the EBZ318H roadheader. The cross-section of the roadway is 15.84 m 2 , and the heading face has a high concentration of respirable rock Dust. This paper presents a study of rock roadheader Dust control by foam, taking into account the Dust Generation characteristics. A new foam preparation system and application method has been proposed and the Dust suppression effect of foam has been assessed by Dust concentration measurements taken at two points next to the roadheader operator in the previously mentioned underground coal mine. The results have shown that the foam dramatically reduced the rock Dust concentrations. The roadheader operator’s respirable Dust exposures were lowed from 540.2 mg/m 3 to 84.3 mg/m 3 , and the Dust suppression efficiency reached 84.4% on the NBME heading face. In addition, the visibility and environment of the heading face was significantly improved. It is concluded that the foam showed a significant improvement on the rock Dust capture efficiency, and avoided the main deficiencies of conventional water sprays.
Deming Wang - One of the best experts on this subject based on the ideXlab platform.
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an experimental investigation on the influence of coal brittleness on Dust Generation
Powder Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Yongchao QiaoAbstract:Abstract As Dust is one of the main hazards generated by coal cutting, understanding the properties of Dust Generation is essential for preventing and controlling its propagation. This paper therefore aims to investigate the influence of coal brittleness on Dust Generation. A system was devised to produce Dust and the density, uniaxial compressive strength, and Brazilian tensile strength of Dust samples were then measured. The results showed that the cumulative proportions of fine particulate matter and respirable Dust increased with brittleness, while a declining trend was observed from the mass ratio of total Dust to coal sample. B14 (half of the product of compressive and tensile strength) had the strongest correlation with the properties of Dust Generation, and accounted for more than 95% of B15 (half of the sum of compressive and tensile strength).
-
the influence of pore structure of coal on characteristics of Dust Generation during the process of conical pick cutting
Powder Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Jin ZhangAbstract:Abstract To reveal the influence of pore structure of coal on the characteristics of coal Dust Generation during roadheader cutting, a self-developed coal cutting system was used to generate Dust. A low field nuclear magnetic resonance was utilized to measure the pore system of coal. Results show that the porosity had negative correlations with the cumulative proportions of both respirable Dust and fine particulate matter (PM2.5), but the positive influence on the mass ratio of Dust Generation (MRD) of total Dust and slight effect on MRD of respirable Dust and PM2.5 were observed. The correlations of the fractal dimension (Df) of pore structure on Dust Generation were inverse compared with that of porosity. The negative relationship between porosity and Df was the reason for the opposite correlations. This study can provide basic support for the estimate of Dust hazard and the development of Dust control technologies.
-
the effect of geometries and cutting parameters of conical pick on the characteristics of Dust Generation experimental investigation and theoretical exploration
Fuel Processing Technology, 2020Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Husheng YangAbstract:Abstract Understanding the characteristics of Dust Generation is the basis of effective Dust control. To reveal the influence of pick geometries and cutting parameters on the characteristics of Dust Generation during roadheader cutting, this paper conducted an experimental investigation and theoretical exploration on the effects of tip angle, attack angle and cutting speed on the cumulative proportion of small size Dust and the mass rate of Dust Generation. It was found that tip angle and attack angle considerably affected Dust Generation, whereas the effect of cutting speed could be ignored. The positive relationships between tip angle and both cumulative proportion and mass rate of Dust Generation were observed. A larger attack angle can reduce Dust Generation. The change of the cutting force and the size of the damaged zone are the fundamental reasons for the difference of Dust Generation under varying conditions. In general, the cutting process with a smaller tip angle of pick and a larger attack angle appears beneficial to abate Dust Generation. This study would enhance the fundamental understanding of coal Dust Generation, which will provide guidance for selecting suitable pick geometries and cutting parameters to ameliorate environment quality and obtain a cleaner production environment.
-
the effect of coal proximate compositions on the characteristics of Dust Generation using a conical pick cutting system
Powder Technology, 2019Co-Authors: Wendong Zhou, Hetang Wang, Deming Wang, Kang Zhang, Wenjie KangAbstract:Abstract To investigate the characteristics of coal Dust Generation when cut by a roadheader, a system was designed for performing cutting experiments. The aerodynamic diameter distribution of Dust was tested by a laser particle size analyzer. Correlations between the coal proximate compositions and the characteristics of Dust Generation were studied. Results showed that fixed carbon had significantly positive correlations with the cumulative proportion of respirable Dust and the rate of Dust Generation. The bonded high-density pulverized core could be responsible for reducing the correlation with fine particulate matter. The presence of moisture had inhibitory effects on Dust Generation. Volatile matter had a slightly negative influence on Dust Generation, and ash was considered to have no effect. More attention should be focused on heading faces with high fixed carbon and low moisture. This study provides essential guidance for understanding the characteristics of Dust Generation and improving Dust reduction technologies.
-
application of foam to suppress rock Dust in a large cross section rock roadway driven with roadheader
Advanced Powder Technology, 2013Co-Authors: Hetang Wang, Deming Wang, Wanxing Ren, Fangwei Han, Yikun ZhangAbstract:Abstract The greatest source of rock Dust on rock roadway heading face is the roadheader. Overexposure to respirable rock Dust can be a serious health hazard to roadheader operators and other workers. One of the rock roadways, named North Belt Main Entry (NBME), belonging to the underground coal mine Zhuxianzhuang, located in east China, is being driven by the EBZ318H roadheader. The cross-section of the roadway is 15.84 m 2 , and the heading face has a high concentration of respirable rock Dust. This paper presents a study of rock roadheader Dust control by foam, taking into account the Dust Generation characteristics. A new foam preparation system and application method has been proposed and the Dust suppression effect of foam has been assessed by Dust concentration measurements taken at two points next to the roadheader operator in the previously mentioned underground coal mine. The results have shown that the foam dramatically reduced the rock Dust concentrations. The roadheader operator’s respirable Dust exposures were lowed from 540.2 mg/m 3 to 84.3 mg/m 3 , and the Dust suppression efficiency reached 84.4% on the NBME heading face. In addition, the visibility and environment of the heading face was significantly improved. It is concluded that the foam showed a significant improvement on the rock Dust capture efficiency, and avoided the main deficiencies of conventional water sprays.
