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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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fluidization characteristics and fine Coal dry beneficiation using a pronation grille baffle dense phase medium fluidized bed
Fuel, 2016Co-Authors: Enhui Zhou, Xuliang Yang, Yuemin Zhao, Chenlong Duan, Yongzheng Liufeng, Xuchen Fan, Yadong ZhangAbstract:Abstract The fluidization of Geldart B particles commonly falls under the bubbling fluidization category, where the Coalescence of bubbles is the dominant phenomenon. If the diameter of bubbles becomes too large, the fluidization quality will deteriorate and lead to significant maldistribution of bed density. In this study, a pronation-grille baffle was introduced into a gas-solid dense phase fluidized bed (GDPFB) in order to improve fluidization quality. This was termed as a pronation-grille baffle dense phase medium fluidized bed (PGBFB). The inhibitory effect of the pronation-grille baffle on the Coalescence of bubbles and the large-scale particles back mixing, as well as the collaborative optimization of the baffle placing height and operating gas velocity were investigated. The density standard deviation ( S δ ) and density skewness ( SK δ ) were employed to evaluate the uniformity and stability of the bed density distribution. According to the experimental results, the S δ of a PGBFB was substantially reduced by 83.7%, compared to a GDPFB, and the lowest SK δ value was decreased to −0.0106, significantly improving the uniformity and stability of the bed density. Additionally, the beneficiation experiments were performed on a 1–6 mm raw Coal in a PGBFB. The beneficiation results showed that the probable error, E, was 0.091 g/cm 3 and the ash content of clean Coal was 16.63%, being reduced by 21.76%, compared to the ash content of the raw Coal. This indicates that fine Coal beneficiation using a PGBFB can provide a simple and efficient way for Coal Cleaning in arid and cold regions.
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density based segregation separation performances of dense medium gas solid fluidized bed separator dmfbs for Coal Cleaning and upgrading
Journal of The Taiwan Institute of Chemical Engineers, 2016Co-Authors: Jingfeng He, Yuemin Zhao, Chenlong DuanAbstract:Abstract Dense medium gas–solid fluidized bed separator (DMFBS) is recognized as a new, alternative technique for Coal Cleaning and upgrading. Characteristics of the used dense medium (magnetite powder) were studied, and washability of the feeding Coal sample was analyzed. A double-layer, stable-pressure air distributor was designed to ensure uniform air distribution for the bed. Fluidization characteristics, including bed pressure drop ΔPB, overall stability of the bed, fluctuation of the bed density, were investigated and the results indicate that the bed can provide favorable fluidization stability and uniform density distribution with suitable gas velocities that allow for Coal separation. Segregation/separation performances of DMFBS are mainly dependent on operating gas velocity. Density-based segregation occurred, with optimum segregation efficiency Sash values of 0.65, 0.68, 0.72 and 0.75 were achieved at U = 1.6 Umf for various sized Coals. The laboratory-scale separator reduced the ash content from 39.56 to 10.96% and rejected sulfur content from 1.07 to 0.41% for 3–25 mm sized Coal. The probable error EP values of 0.075, 0.070, 0.060 and 0.058 g/cm3 were obtained at the separating densities of 1.605, 1.69, 1.76 and 1.83 g/cm3, respectively for various sized Coals, indicating that a notable separation performance was achieved.
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fine Coal dry beneficiation using autogenous medium in a vibrated fluidized bed
International Journal of Mineral Processing, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Zengqiang ChenAbstract:Abstract Dry beneficiation of fine Coal (− 6 mm) using autogenous medium in a vibrated fluidized bed has been studied. The results show that in the particulate bed of fine Coal, most of − 1 + 0.5 mm size fractions of Coal and a small portion of − 0.5 mm size fraction of Coal having high ash content contribute to the formation of an autogenous medium bed. This provides a favorable fluidization environment for the stratification process of fine Coal particles depending on their density difference. The main operational parameters including superficial air velocity, vibration frequency and amplitude, initial bed height and separating time all have significant influences on the stratification performance of the particulate bed of fine Coal. The batch separation results of Wuhai fine Coal in an autogenous medium vibrated fluidized bed show that the separation efficiency, i.e. the probable error E , is 0.14, indicating that dry beneficiation of fine Coal using an autogenous medium vibrated fluidized bed is a promising technique for Coal Cleaning in dry regions.
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fine Coal dry Cleaning using a vibrated gas fluidized bed
Fuel Processing Technology, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Chenlong Duan, Liang DongAbstract:Abstract Fine Coal (− 6 mm) Cleaning in a dry way becomes more important with the extensive deployment of the mechanized mining and progressively serious water shortage, especially in North-West China. In this paper, we attempted to use the segregation in a vibrated gas-fluidized bed of dissimilar particles to provide a solution to this problem. The effects of several factors including the superficial air velocity, bed height, vibration intensity and fluidizing time on the segregation performance were experimentally studied. The bubble-driven jigging mechanism was proposed to explain the separation process. The results show that the probable error E values of the separation of − 6 + 3 mm and − 3 + 1 mm size fraction of feed Coal samples are 0.19 and 0.175 respectively, which indicates that fine Coal separation using a vibrated gas-fluidized bed can provide a simple and efficient way for Coal Cleaning in dry and cold regions in North-West China.
Chenlong Duan - One of the best experts on this subject based on the ideXlab platform.
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fluidization characteristics and fine Coal dry beneficiation using a pronation grille baffle dense phase medium fluidized bed
Fuel, 2016Co-Authors: Enhui Zhou, Xuliang Yang, Yuemin Zhao, Chenlong Duan, Yongzheng Liufeng, Xuchen Fan, Yadong ZhangAbstract:Abstract The fluidization of Geldart B particles commonly falls under the bubbling fluidization category, where the Coalescence of bubbles is the dominant phenomenon. If the diameter of bubbles becomes too large, the fluidization quality will deteriorate and lead to significant maldistribution of bed density. In this study, a pronation-grille baffle was introduced into a gas-solid dense phase fluidized bed (GDPFB) in order to improve fluidization quality. This was termed as a pronation-grille baffle dense phase medium fluidized bed (PGBFB). The inhibitory effect of the pronation-grille baffle on the Coalescence of bubbles and the large-scale particles back mixing, as well as the collaborative optimization of the baffle placing height and operating gas velocity were investigated. The density standard deviation ( S δ ) and density skewness ( SK δ ) were employed to evaluate the uniformity and stability of the bed density distribution. According to the experimental results, the S δ of a PGBFB was substantially reduced by 83.7%, compared to a GDPFB, and the lowest SK δ value was decreased to −0.0106, significantly improving the uniformity and stability of the bed density. Additionally, the beneficiation experiments were performed on a 1–6 mm raw Coal in a PGBFB. The beneficiation results showed that the probable error, E, was 0.091 g/cm 3 and the ash content of clean Coal was 16.63%, being reduced by 21.76%, compared to the ash content of the raw Coal. This indicates that fine Coal beneficiation using a PGBFB can provide a simple and efficient way for Coal Cleaning in arid and cold regions.
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density based segregation separation performances of dense medium gas solid fluidized bed separator dmfbs for Coal Cleaning and upgrading
Journal of The Taiwan Institute of Chemical Engineers, 2016Co-Authors: Jingfeng He, Yuemin Zhao, Chenlong DuanAbstract:Abstract Dense medium gas–solid fluidized bed separator (DMFBS) is recognized as a new, alternative technique for Coal Cleaning and upgrading. Characteristics of the used dense medium (magnetite powder) were studied, and washability of the feeding Coal sample was analyzed. A double-layer, stable-pressure air distributor was designed to ensure uniform air distribution for the bed. Fluidization characteristics, including bed pressure drop ΔPB, overall stability of the bed, fluctuation of the bed density, were investigated and the results indicate that the bed can provide favorable fluidization stability and uniform density distribution with suitable gas velocities that allow for Coal separation. Segregation/separation performances of DMFBS are mainly dependent on operating gas velocity. Density-based segregation occurred, with optimum segregation efficiency Sash values of 0.65, 0.68, 0.72 and 0.75 were achieved at U = 1.6 Umf for various sized Coals. The laboratory-scale separator reduced the ash content from 39.56 to 10.96% and rejected sulfur content from 1.07 to 0.41% for 3–25 mm sized Coal. The probable error EP values of 0.075, 0.070, 0.060 and 0.058 g/cm3 were obtained at the separating densities of 1.605, 1.69, 1.76 and 1.83 g/cm3, respectively for various sized Coals, indicating that a notable separation performance was achieved.
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fine Coal dry Cleaning using a vibrated gas fluidized bed
Fuel Processing Technology, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Chenlong Duan, Liang DongAbstract:Abstract Fine Coal (− 6 mm) Cleaning in a dry way becomes more important with the extensive deployment of the mechanized mining and progressively serious water shortage, especially in North-West China. In this paper, we attempted to use the segregation in a vibrated gas-fluidized bed of dissimilar particles to provide a solution to this problem. The effects of several factors including the superficial air velocity, bed height, vibration intensity and fluidizing time on the segregation performance were experimentally studied. The bubble-driven jigging mechanism was proposed to explain the separation process. The results show that the probable error E values of the separation of − 6 + 3 mm and − 3 + 1 mm size fraction of feed Coal samples are 0.19 and 0.175 respectively, which indicates that fine Coal separation using a vibrated gas-fluidized bed can provide a simple and efficient way for Coal Cleaning in dry and cold regions in North-West China.
Xuliang Yang - One of the best experts on this subject based on the ideXlab platform.
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fluidization characteristics and fine Coal dry beneficiation using a pronation grille baffle dense phase medium fluidized bed
Fuel, 2016Co-Authors: Enhui Zhou, Xuliang Yang, Yuemin Zhao, Chenlong Duan, Yongzheng Liufeng, Xuchen Fan, Yadong ZhangAbstract:Abstract The fluidization of Geldart B particles commonly falls under the bubbling fluidization category, where the Coalescence of bubbles is the dominant phenomenon. If the diameter of bubbles becomes too large, the fluidization quality will deteriorate and lead to significant maldistribution of bed density. In this study, a pronation-grille baffle was introduced into a gas-solid dense phase fluidized bed (GDPFB) in order to improve fluidization quality. This was termed as a pronation-grille baffle dense phase medium fluidized bed (PGBFB). The inhibitory effect of the pronation-grille baffle on the Coalescence of bubbles and the large-scale particles back mixing, as well as the collaborative optimization of the baffle placing height and operating gas velocity were investigated. The density standard deviation ( S δ ) and density skewness ( SK δ ) were employed to evaluate the uniformity and stability of the bed density distribution. According to the experimental results, the S δ of a PGBFB was substantially reduced by 83.7%, compared to a GDPFB, and the lowest SK δ value was decreased to −0.0106, significantly improving the uniformity and stability of the bed density. Additionally, the beneficiation experiments were performed on a 1–6 mm raw Coal in a PGBFB. The beneficiation results showed that the probable error, E, was 0.091 g/cm 3 and the ash content of clean Coal was 16.63%, being reduced by 21.76%, compared to the ash content of the raw Coal. This indicates that fine Coal beneficiation using a PGBFB can provide a simple and efficient way for Coal Cleaning in arid and cold regions.
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fine Coal dry beneficiation using autogenous medium in a vibrated fluidized bed
International Journal of Mineral Processing, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Zengqiang ChenAbstract:Abstract Dry beneficiation of fine Coal (− 6 mm) using autogenous medium in a vibrated fluidized bed has been studied. The results show that in the particulate bed of fine Coal, most of − 1 + 0.5 mm size fractions of Coal and a small portion of − 0.5 mm size fraction of Coal having high ash content contribute to the formation of an autogenous medium bed. This provides a favorable fluidization environment for the stratification process of fine Coal particles depending on their density difference. The main operational parameters including superficial air velocity, vibration frequency and amplitude, initial bed height and separating time all have significant influences on the stratification performance of the particulate bed of fine Coal. The batch separation results of Wuhai fine Coal in an autogenous medium vibrated fluidized bed show that the separation efficiency, i.e. the probable error E , is 0.14, indicating that dry beneficiation of fine Coal using an autogenous medium vibrated fluidized bed is a promising technique for Coal Cleaning in dry regions.
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fine Coal dry Cleaning using a vibrated gas fluidized bed
Fuel Processing Technology, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Chenlong Duan, Liang DongAbstract:Abstract Fine Coal (− 6 mm) Cleaning in a dry way becomes more important with the extensive deployment of the mechanized mining and progressively serious water shortage, especially in North-West China. In this paper, we attempted to use the segregation in a vibrated gas-fluidized bed of dissimilar particles to provide a solution to this problem. The effects of several factors including the superficial air velocity, bed height, vibration intensity and fluidizing time on the segregation performance were experimentally studied. The bubble-driven jigging mechanism was proposed to explain the separation process. The results show that the probable error E values of the separation of − 6 + 3 mm and − 3 + 1 mm size fraction of feed Coal samples are 0.19 and 0.175 respectively, which indicates that fine Coal separation using a vibrated gas-fluidized bed can provide a simple and efficient way for Coal Cleaning in dry and cold regions in North-West China.
Vida N. Sharifi - One of the best experts on this subject based on the ideXlab platform.
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pelletised fuel production from Coal tailings and spent mushroom compost part ii economic feasibility based on cost analysis
Fuel Processing Technology, 2008Co-Authors: Changkook Ryu, Adela Khor, Vida N. SharifiAbstract:Due to the growing market for sustainable energy, in order to increase the quality of the fuels, pellets are being produced from various materials such as wood and other biomass energy crops, and municipal waste. This paper presents the results from an economic feasibility study for pellet production using blends of two residue materials: Coal tailings from Coal Cleaning and spent mushroom compost (SMC) from mushroom production. Key variables such as the mixture composition, raw material haulage and plant scale were considered and the production costs were compared to Coal and biomass energy prices. For both wet materials, the moisture content was the critical parameter that influenced the fuel energy costs. The haulage distance of the raw materials was another factor that can pose a high risk. The results showed that the pellet production from the above two materials can be viable when a less energy-intensive drying process is utilised. Potential market outlets and ways to lower the costs are also discussed in this paper.
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pelletised fuel production from Coal tailings and spent mushroom compost part i identification of pelletisation parameters
Fuel Processing Technology, 2008Co-Authors: Changkook Ryu, Karen N. Finney, Vida N. Sharifi, Jim SwithenbankAbstract:Abstract This study investigates the technology of manufacturing pellet blends for energy production from two discarded materials in industry. Coal tailings material is the fine discard produced as a result of Coal Cleaning. Although it still has a significantly high calorific value, over a million tonnes of Coal tailings are deposited in lagoons every year in the UK alone. Spent mushroom compost (SMC) consists of fibrous compost substrate and a wet casing layer used during mushroom production. In the form of pellets, these materials become more homogeneous, easily stored and transported, and suitable for use in power plants or gasifiers. The characterisation of the fuel properties shows that the two materials have a complimentary status for pelletisation and energy production in terms of particle types, carbon source, calorific value and volatile matter content. Pelletisation tests were carried out using a small compression rig for various pressures, moisture contents and mixture compositions. The quality of the pellets was assessed using density, swelling, tensile strength and durability. It was necessary to keep the moisture contents for Coal tailings at about 10% and for SMC at 20% before pelletisation in order to maximise the bonding strength of the originally wet materials. Pressures above 6000 psi did not produce noticeably denser or stronger pellets. The pellets from Coal tailings and SMC blends had a tensile strength proportional to the SMC fraction. The SMC pellets were more durable than the Coal tailing pellets due to the intertwined compost fibres. It was also noted that the SMC addition to the Coal tailings did not increase the durability of the pellets due to the limited binding effect between the two materials.
Liang Dong - 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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fine Coal dry Cleaning using a vibrated gas fluidized bed
Fuel Processing Technology, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Chenlong Duan, Liang DongAbstract:Abstract Fine Coal (− 6 mm) Cleaning in a dry way becomes more important with the extensive deployment of the mechanized mining and progressively serious water shortage, especially in North-West China. In this paper, we attempted to use the segregation in a vibrated gas-fluidized bed of dissimilar particles to provide a solution to this problem. The effects of several factors including the superficial air velocity, bed height, vibration intensity and fluidizing time on the segregation performance were experimentally studied. The bubble-driven jigging mechanism was proposed to explain the separation process. The results show that the probable error E values of the separation of − 6 + 3 mm and − 3 + 1 mm size fraction of feed Coal samples are 0.19 and 0.175 respectively, which indicates that fine Coal separation using a vibrated gas-fluidized bed can provide a simple and efficient way for Coal Cleaning in dry and cold regions in North-West China.