The Experts below are selected from a list of 87891 Experts worldwide ranked by ideXlab platform
Yuemin Zhao - One of the best experts on this subject based on the ideXlab platform.
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studies on bed Density in a gas vibro fluidized bed for coal cleaning
ACS omega, 2019Co-Authors: Chenyang Zhou, Liang Dong, Yuemin ZhaoAbstract:Dry coal beneficiation has played a vital role during the initial stage of coal cleaning in recent years. Successful utilization of a gas–solid fluidized bed for >6 mm coal cleaning motivates scholars to explore the possibility of fine coal cleaning using dry beneficiation methods. In this study, pulsed flow was introduced into a fluidized bed to optimize bubble behavior, thus improving the Density stability. The equation of minimum fluidization velocity (Umfp) in a gas-vibro fluidized bed for coal preparation was investigated theoretically. An equation has been proposed for predicting Umfp while considering changes in the friction coefficient (Cf) in the gas-vibro fluidized bed. Based on two-phase theory, the correlation of bed Density was determined by analyzing the bubble behavior in the gas-vibro fluidized bed. The theoretical bed Density was then compared with experimental data of the bed Density and Separation Density. The predicted bed Density in monodisperse and binary dense medium systems was fou...
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Studies on Bed Density in a Gas-Vibro Fluidized Bed for Coal Cleaning.
ACS omega, 2019Co-Authors: Chenyang Zhou, Yuemin Zhao, Liang Dong, Xuchen FanAbstract:Open in a separate window Dry coal beneficiation has played a vital role during the initial stage of coal cleaning in recent years. Successful utilization of a gas–solid fluidized bed for >6 mm coal cleaning motivates scholars to explore the possibility of fine coal cleaning using dry beneficiation methods. In this study, pulsed flow was introduced into a fluidized bed to optimize bubble behavior, thus improving the Density stability. The equation of minimum fluidization velocity (Umfp) in a gas-vibro fluidized bed for coal preparation was investigated theoretically. An equation has been proposed for predicting Umfp while considering changes in the friction coefficient (Cf) in the gas-vibro fluidized bed. Based on two-phase theory, the correlation of bed Density was determined by analyzing the bubble behavior in the gas-vibro fluidized bed. The theoretical bed Density was then compared with experimental data of the bed Density and Separation Density. The predicted bed Density in monodisperse and binary dense medium systems was found to be consistent with the experimental results. Overall, the equation of bed Density is suitable for estimating the Separation Density in the gas-vibro fluidized bed.
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dry coal beneficiation by the semi industrial air dense medium fluidized bed with binary mixtures of magnetite and fine coal particles
Fuel, 2019Co-Authors: Zhijie Fu, Shahzad Barghi, Yuemin Zhao, Chenlong DuanAbstract:Abstract Air Dense Medium Fluidized Bed (ADMFB) is deemed to be one of the most efficient methods for dry coal beneficiation. In the present work, a semi-industrial ADMFB system in continuous operation was utilized to study the effects of operating gas velocity, feed coal size, and mixture composition of medium particles on the coal beneficiation in industrial practice. Binary mixtures of magnetite and fine coal particles were used as the medium material, and four different feed coal samples with the size ranges of −50 + 25, −25 + 13, −13 − 6, and −6 + 2 mm were tested individually. The experimental results showed that the influence of excess gas velocity on the dry coal Separation is relatively small in the lower flow rates. The Separation Density and probable error increase with the decreasing of feed coal size, regardless of the type of feed coal. The Separation Density can be continually reduced by further increasing the fraction of fine coal in the medium material, with the compromise of the increased probable error. Moreover, the ash content and calorific value of −50 + 6 mm coarse coal can be effectively upgraded, but the beneficiation of −6 + 2 mm fine coal was less efficient.
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Collaborative optimization of vibration and gas flow on fluidization quality and fine coal segregation in a vibrated dense medium fluidized bed
Powder Technology, 2017Co-Authors: Enhui Zhou, Yuemin Zhao, Chenlong Duan, Liang Dong, Yadong Zhang, Zhenfu Luo, Xuliang Yang, Bo ZhangAbstract:Abstract In a vibrated dense medium fluidized bed (VDMFB), the uniform and stable gas-solid fluidized bed where medium particles belong to the Geldart B, was formed and considered suitable for 1–6 mm fine coal Separation under the combined effects of both vibration energy and air flow. Driven by the excitation force, the particles in the VDMFB had a higher kinetic activity and lower minimum fluidization gas velocity. Prior to the bed fluidizing initiation (fluidization number, N 7.1, the vibration amplitude effect on the vibration energy transmission in the bed was quite significant. In the study of the vibration energy effective range, it was discovered that the bed could be utilized for the fine coal effective Separation in the area below 60 mm for the VDMFB with 80 mm of static bed height, where the vibration energy was continuously and steadily transmitted and attenuated along the bed height. Regarding the raw coal with a washability variety, the Separation Density could be flexibly regulated in the VDMFB. The Separation results demonstrated that the ash content of three clean coal products was decreased exceeding 50%, compared to the ash content of the raw coal when the Separation Density was set at 1.49 g/cm3, 1.67 g/cm3 and 1.78 g/cm3 respectively, indicating that the VDMFB could effectively separate fine coal by a dry method.
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effect of the secondary air distribution layer on Separation Density in a dense phase gas solid fluidized bed
International journal of mining science and technology, 2015Co-Authors: Bo Lv, Yuemin Zhao, Chenyang Zhou, Bo Zhang, Wenchao YuanAbstract:Abstract Dry coal Separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry Separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas–solid fluidized bed beneficiation, the material is stratified according to its Density; the high Density material layer remains at the bed bottom, and thus the high Density coarse particle bed becomes an important influencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the traditional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the Density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 mm, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas–solid Separation fluidized with a high Density coarse particle layer can be as low as 0.085 g/cm 3 .
Wenchao Yuan - One of the best experts on this subject based on the ideXlab platform.
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effect of the secondary air distribution layer on Separation Density in a dense phase gas solid fluidized bed
International journal of mining science and technology, 2015Co-Authors: Bo Lv, Yuemin Zhao, Chenyang Zhou, Bo Zhang, Wenchao YuanAbstract:Abstract Dry coal Separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry Separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas–solid fluidized bed beneficiation, the material is stratified according to its Density; the high Density material layer remains at the bed bottom, and thus the high Density coarse particle bed becomes an important influencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the traditional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the Density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 mm, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas–solid Separation fluidized with a high Density coarse particle layer can be as low as 0.085 g/cm 3 .
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Effect of the secondary air distribution layer on Separation Density in a dense-phase gas–solid fluidized bed
International Journal of Mining Science and Technology, 2015Co-Authors: Zhenfu Luo, Yuemin Zhao, Chenyang Zhou, Bo Zhang, Wenchao YuanAbstract:Abstract Dry coal Separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry Separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas–solid fluidized bed beneficiation, the material is stratified according to its Density; the high Density material layer remains at the bed bottom, and thus the high Density coarse particle bed becomes an important influencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the traditional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the Density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 mm, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas–solid Separation fluidized with a high Density coarse particle layer can be as low as 0.085 g/cm 3 .
Bo Zhang - One of the best experts on this subject based on the ideXlab platform.
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Collaborative optimization of vibration and gas flow on fluidization quality and fine coal segregation in a vibrated dense medium fluidized bed
Powder Technology, 2017Co-Authors: Enhui Zhou, Yuemin Zhao, Chenlong Duan, Liang Dong, Yadong Zhang, Zhenfu Luo, Xuliang Yang, Bo ZhangAbstract:Abstract In a vibrated dense medium fluidized bed (VDMFB), the uniform and stable gas-solid fluidized bed where medium particles belong to the Geldart B, was formed and considered suitable for 1–6 mm fine coal Separation under the combined effects of both vibration energy and air flow. Driven by the excitation force, the particles in the VDMFB had a higher kinetic activity and lower minimum fluidization gas velocity. Prior to the bed fluidizing initiation (fluidization number, N 7.1, the vibration amplitude effect on the vibration energy transmission in the bed was quite significant. In the study of the vibration energy effective range, it was discovered that the bed could be utilized for the fine coal effective Separation in the area below 60 mm for the VDMFB with 80 mm of static bed height, where the vibration energy was continuously and steadily transmitted and attenuated along the bed height. Regarding the raw coal with a washability variety, the Separation Density could be flexibly regulated in the VDMFB. The Separation results demonstrated that the ash content of three clean coal products was decreased exceeding 50%, compared to the ash content of the raw coal when the Separation Density was set at 1.49 g/cm3, 1.67 g/cm3 and 1.78 g/cm3 respectively, indicating that the VDMFB could effectively separate fine coal by a dry method.
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effect of the secondary air distribution layer on Separation Density in a dense phase gas solid fluidized bed
International journal of mining science and technology, 2015Co-Authors: Bo Lv, Yuemin Zhao, Chenyang Zhou, Bo Zhang, Wenchao YuanAbstract:Abstract Dry coal Separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry Separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas–solid fluidized bed beneficiation, the material is stratified according to its Density; the high Density material layer remains at the bed bottom, and thus the high Density coarse particle bed becomes an important influencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the traditional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the Density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 mm, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas–solid Separation fluidized with a high Density coarse particle layer can be as low as 0.085 g/cm 3 .
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Effect of the secondary air distribution layer on Separation Density in a dense-phase gas–solid fluidized bed
International Journal of Mining Science and Technology, 2015Co-Authors: Zhenfu Luo, Yuemin Zhao, Chenyang Zhou, Bo Zhang, Wenchao YuanAbstract:Abstract Dry coal Separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry Separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas–solid fluidized bed beneficiation, the material is stratified according to its Density; the high Density material layer remains at the bed bottom, and thus the high Density coarse particle bed becomes an important influencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the traditional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the Density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 mm, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas–solid Separation fluidized with a high Density coarse particle layer can be as low as 0.085 g/cm 3 .
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Utilizing an Air-Dense Medium Fluidized Bed Dry Separating System for Preparing a Low-Ash Coal
International Journal of Coal Preparation and Utilization, 2014Co-Authors: Bo Zhang, Yuemin Zhao, Zhenfu Luo, Shulei Song, Cheng ShengAbstract:An industrial-scale air-dense medium fluidized bed was used to prepare a low-ash coal from a feed coal that was difficult to wash. The low-ash coal provided raw material for preparing low-ash activated carbon. A new fluidized bed Density control method for preparing a low-ash coal was proposed, which effectively reduced bed Density fluctuation, thus maintaining the uniformity and stability of the bed Density. A Separation Density of 1.42 g/cm3 was maintained in the air-dense medium fluidized bed to produce a clean coal with an ash content of 3.71%, with an E P value of 0.055. Results showed that the air-dense medium fluidized bed system is an efficient dry Separation method for difficult-to-wash coal.
Chenyang Zhou - One of the best experts on this subject based on the ideXlab platform.
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Studies on Bed Density in a Gas-Vibro Fluidized Bed for Coal Cleaning.
ACS omega, 2019Co-Authors: Chenyang Zhou, Yuemin Zhao, Liang Dong, Xuchen FanAbstract:Open in a separate window Dry coal beneficiation has played a vital role during the initial stage of coal cleaning in recent years. Successful utilization of a gas–solid fluidized bed for >6 mm coal cleaning motivates scholars to explore the possibility of fine coal cleaning using dry beneficiation methods. In this study, pulsed flow was introduced into a fluidized bed to optimize bubble behavior, thus improving the Density stability. The equation of minimum fluidization velocity (Umfp) in a gas-vibro fluidized bed for coal preparation was investigated theoretically. An equation has been proposed for predicting Umfp while considering changes in the friction coefficient (Cf) in the gas-vibro fluidized bed. Based on two-phase theory, the correlation of bed Density was determined by analyzing the bubble behavior in the gas-vibro fluidized bed. The theoretical bed Density was then compared with experimental data of the bed Density and Separation Density. The predicted bed Density in monodisperse and binary dense medium systems was found to be consistent with the experimental results. Overall, the equation of bed Density is suitable for estimating the Separation Density in the gas-vibro fluidized bed.
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studies on bed Density in a gas vibro fluidized bed for coal cleaning
ACS omega, 2019Co-Authors: Chenyang Zhou, Liang Dong, Yuemin ZhaoAbstract:Dry coal beneficiation has played a vital role during the initial stage of coal cleaning in recent years. Successful utilization of a gas–solid fluidized bed for >6 mm coal cleaning motivates scholars to explore the possibility of fine coal cleaning using dry beneficiation methods. In this study, pulsed flow was introduced into a fluidized bed to optimize bubble behavior, thus improving the Density stability. The equation of minimum fluidization velocity (Umfp) in a gas-vibro fluidized bed for coal preparation was investigated theoretically. An equation has been proposed for predicting Umfp while considering changes in the friction coefficient (Cf) in the gas-vibro fluidized bed. Based on two-phase theory, the correlation of bed Density was determined by analyzing the bubble behavior in the gas-vibro fluidized bed. The theoretical bed Density was then compared with experimental data of the bed Density and Separation Density. The predicted bed Density in monodisperse and binary dense medium systems was fou...
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effect of the secondary air distribution layer on Separation Density in a dense phase gas solid fluidized bed
International journal of mining science and technology, 2015Co-Authors: Bo Lv, Yuemin Zhao, Chenyang Zhou, Bo Zhang, Wenchao YuanAbstract:Abstract Dry coal Separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry Separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas–solid fluidized bed beneficiation, the material is stratified according to its Density; the high Density material layer remains at the bed bottom, and thus the high Density coarse particle bed becomes an important influencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the traditional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the Density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 mm, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas–solid Separation fluidized with a high Density coarse particle layer can be as low as 0.085 g/cm 3 .
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Effect of the secondary air distribution layer on Separation Density in a dense-phase gas–solid fluidized bed
International Journal of Mining Science and Technology, 2015Co-Authors: Zhenfu Luo, Yuemin Zhao, Chenyang Zhou, Bo Zhang, Wenchao YuanAbstract:Abstract Dry coal Separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry Separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas–solid fluidized bed beneficiation, the material is stratified according to its Density; the high Density material layer remains at the bed bottom, and thus the high Density coarse particle bed becomes an important influencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the traditional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the Density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 mm, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas–solid Separation fluidized with a high Density coarse particle layer can be as low as 0.085 g/cm 3 .
Zhenfu Luo - One of the best experts on this subject based on the ideXlab platform.
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Collaborative optimization of vibration and gas flow on fluidization quality and fine coal segregation in a vibrated dense medium fluidized bed
Powder Technology, 2017Co-Authors: Enhui Zhou, Yuemin Zhao, Chenlong Duan, Liang Dong, Yadong Zhang, Zhenfu Luo, Xuliang Yang, Bo ZhangAbstract:Abstract In a vibrated dense medium fluidized bed (VDMFB), the uniform and stable gas-solid fluidized bed where medium particles belong to the Geldart B, was formed and considered suitable for 1–6 mm fine coal Separation under the combined effects of both vibration energy and air flow. Driven by the excitation force, the particles in the VDMFB had a higher kinetic activity and lower minimum fluidization gas velocity. Prior to the bed fluidizing initiation (fluidization number, N 7.1, the vibration amplitude effect on the vibration energy transmission in the bed was quite significant. In the study of the vibration energy effective range, it was discovered that the bed could be utilized for the fine coal effective Separation in the area below 60 mm for the VDMFB with 80 mm of static bed height, where the vibration energy was continuously and steadily transmitted and attenuated along the bed height. Regarding the raw coal with a washability variety, the Separation Density could be flexibly regulated in the VDMFB. The Separation results demonstrated that the ash content of three clean coal products was decreased exceeding 50%, compared to the ash content of the raw coal when the Separation Density was set at 1.49 g/cm3, 1.67 g/cm3 and 1.78 g/cm3 respectively, indicating that the VDMFB could effectively separate fine coal by a dry method.
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Effect of the secondary air distribution layer on Separation Density in a dense-phase gas–solid fluidized bed
International Journal of Mining Science and Technology, 2015Co-Authors: Zhenfu Luo, Yuemin Zhao, Chenyang Zhou, Bo Zhang, Wenchao YuanAbstract:Abstract Dry coal Separation has been the most significant process in the field of coal beneficiation to date, because of its special advantage of operation with no water consumption. Mineral dry Separation research has received wide attention, particularly in countries and regions experiencing drought and water shortages. During the process of dense coal gas–solid fluidized bed beneficiation, the material is stratified according to its Density; the high Density material layer remains at the bed bottom, and thus the high Density coarse particle bed becomes an important influencing factor in fluidized bed stability. In the steady fluidization stage, a small number of large radius bubbles are the direct cause of unsteady fluidization in the traditional fluidized bed. The dispersion effect of the secondary air distribution bed for air flow is mainly apparent in the gas region; when the particle size exceeds 13 mm, the secondary air distribution bed has a synergistic effect on the Density stability of the upper fluidized layer. When the particle size is small, especially when less than 6 mm, particles will constantly move, accounting for instability of the secondary air distribution bed and distorting the stability of the upper fluidized bed. Under optimum operation conditions, the probable deviation E of gas–solid Separation fluidized with a high Density coarse particle layer can be as low as 0.085 g/cm 3 .
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Utilizing an Air-Dense Medium Fluidized Bed Dry Separating System for Preparing a Low-Ash Coal
International Journal of Coal Preparation and Utilization, 2014Co-Authors: Bo Zhang, Yuemin Zhao, Zhenfu Luo, Shulei Song, Cheng ShengAbstract:An industrial-scale air-dense medium fluidized bed was used to prepare a low-ash coal from a feed coal that was difficult to wash. The low-ash coal provided raw material for preparing low-ash activated carbon. A new fluidized bed Density control method for preparing a low-ash coal was proposed, which effectively reduced bed Density fluctuation, thus maintaining the uniformity and stability of the bed Density. A Separation Density of 1.42 g/cm3 was maintained in the air-dense medium fluidized bed to produce a clean coal with an ash content of 3.71%, with an E P value of 0.055. Results showed that the air-dense medium fluidized bed system is an efficient dry Separation method for difficult-to-wash coal.
