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Effects of gas type and hopper pressure on the discharge of pulverized coal / Haifeng Lu in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3709-3714 Titre : Effects of gas type and hopper pressure on the discharge of pulverized coal Type de document : texte imprimé Auteurs : Haifeng Lu, Auteur ; Xiaolei Guo, Auteur ; Xin Gong, Auteur Année de publication : 2012 Article en page(s) : pp. 3709-3714 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Coal  Bin Résumé : The influence of gas type (air and CO2) and hopper pressure (0―400 kPa) on the discharge of the pulverized coal was investigated. For aerated discharge, fluidization in the hopper is the initial state of the discharge process; the state of gas-solid fluidization affects the subsequent hopper discharging significantly. Compared to air, CO2 showed a weaker ability to fluidize the pulverized coal, and thus it was more difficult to improve the hopper discharge at atmospheric pressure. On the other hand, increasing the hopper pressure did not affect the basic discharge law but increased the discharge rate to a certain degree. In addition, with the increase of the hopper pressure, the discharge differences between the air and CO2 aeration series reduced, because the discharge rate had a larger promotion from atmospheric pressure to 400 kPa for the CO2 case. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595799 [article] Effects of gas type and hopper pressure on the discharge of pulverized coal [texte imprimé] / Haifeng Lu, Auteur ; Xiaolei Guo, Auteur ; Xin Gong, Auteur . - 2012 . - pp. 3709-3714. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3709-3714 Mots-clés : Coal  Bin Résumé : The influence of gas type (air and CO2) and hopper pressure (0―400 kPa) on the discharge of the pulverized coal was investigated. For aerated discharge, fluidization in the hopper is the initial state of the discharge process; the state of gas-solid fluidization affects the subsequent hopper discharging significantly. Compared to air, CO2 showed a weaker ability to fluidize the pulverized coal, and thus it was more difficult to improve the hopper discharge at atmospheric pressure. On the other hand, increasing the hopper pressure did not affect the basic discharge law but increased the discharge rate to a certain degree. In addition, with the increase of the hopper pressure, the discharge differences between the air and CO2 aeration series reduced, because the discharge rate had a larger promotion from atmospheric pressure to 400 kPa for the CO2 case. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595799

Flow pattern characteristics in vertical dense-phase pneumatic conveying of pulverized coal using electrical capacitance tomography / Xingliang Cong in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15268-15275 Titre : Flow pattern characteristics in vertical dense-phase pneumatic conveying of pulverized coal using electrical capacitance tomography Type de document : texte imprimé Auteurs : Xingliang Cong, Auteur ; Xiaolei Guo, Auteur ; Haifeng Lu, Auteur Année de publication : 2013 Article en page(s) : pp. 15268-15275 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Tomography  Capacitance  Coal  Pneumatic  conveyance  Dense  phaseFlow  field Résumé : Research on flow patterns can provide a better understanding of particle dynamics in dense-phase pneumatic conveying of pulverized coal. In this paper, electrical capacitance tomography (ECT) has been employed to study flow patterns in the 20 mm diameter vertical riser. Three flow patterns were identified on the basis of ECT image analysis, and their characteristics and formation mechanisms were discussed. The flow patterns at high solid concentration were more asymmetrical than those at low solid concentration. Solid concentration signals obtained from ECT were analyzed by different signal analysis methods including relative standard deviation (RSD), probability density function (PDF), and power spectral density function (PSD), which were verified to be effective enough to identify the characteristics of the different flow patterns. Additionally, the Bi model (Bi, H. T.; Grace, J. R. Int. J. Multiphase Flow 1995, 21, 1229-1239) was modified to effectively predict chocking velocity in the vertical dense-phase pneumatic conveying of pulverized coal. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679647 [article] Flow pattern characteristics in vertical dense-phase pneumatic conveying of pulverized coal using electrical capacitance tomography [texte imprimé] / Xingliang Cong, Auteur ; Xiaolei Guo, Auteur ; Haifeng Lu, Auteur . - 2013 . - pp. 15268-15275. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15268-15275 Mots-clés : Tomography  Capacitance  Coal  Pneumatic  conveyance  Dense  phaseFlow  field Résumé : Research on flow patterns can provide a better understanding of particle dynamics in dense-phase pneumatic conveying of pulverized coal. In this paper, electrical capacitance tomography (ECT) has been employed to study flow patterns in the 20 mm diameter vertical riser. Three flow patterns were identified on the basis of ECT image analysis, and their characteristics and formation mechanisms were discussed. The flow patterns at high solid concentration were more asymmetrical than those at low solid concentration. Solid concentration signals obtained from ECT were analyzed by different signal analysis methods including relative standard deviation (RSD), probability density function (PDF), and power spectral density function (PSD), which were verified to be effective enough to identify the characteristics of the different flow patterns. Additionally, the Bi model (Bi, H. T.; Grace, J. R. Int. J. Multiphase Flow 1995, 21, 1229-1239) was modified to effectively predict chocking velocity in the vertical dense-phase pneumatic conveying of pulverized coal. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679647

The Discharge of pulverized coal from a pressurized aerated hopper / Haifeng Lu in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13839-13845 Titre : The Discharge of pulverized coal from a pressurized aerated hopper Type de document : texte imprimé Auteurs : Haifeng Lu, Auteur ; Xiaolei Guo, Auteur ; Xingliang Cong, Auteur Année de publication : 2012 Article en page(s) : pp. 13839-13845 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Bin  Coal Résumé : An aerated discharge system was established in this paper to investigate the discharge of pulverized coal from a pressurized aerated hopper. Two opposite effects of aerated gas on solid were first revealed. "Fluidized pressurization", which effectively fluidized the solid and improved the subsequent hopper discharge, was then developed. The effect of hopper pressure on the discharge of pulverized coal was studied. Our experimental results showed that the gas volumetric flow rate increased and the gas superficial velocity decreased with the increase of the hopper pressure in the range of 0―1800 kPa. It was confirmed that more energy was needed; the uncertainty and instability was increased to discharge pulverized coal at higher pressures. Gas momentum flux was defined and used to describe the effect of aeration. The optimum gas momentum flux, which was independent of the hopper pressure, was obtained on the basis of the experimental data. The optimum gas volumetric flow rates and the optimum gas superficial velocities corresponding to the maximum solid discharge rates were further predicted, which agreed well with the experimental data. On the other hand, the hopper pressure also showed a positive effect on the solid discharge, as the maximum solid discharge rate increased gradually with the hopper pressure until a limit value of about 8000 kg/ h was reached at 800 kPa. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508208 [article] The Discharge of pulverized coal from a pressurized aerated hopper [texte imprimé] / Haifeng Lu, Auteur ; Xiaolei Guo, Auteur ; Xingliang Cong, Auteur . - 2012 . - pp. 13839-13845. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13839-13845 Mots-clés : Bin  Coal Résumé : An aerated discharge system was established in this paper to investigate the discharge of pulverized coal from a pressurized aerated hopper. Two opposite effects of aerated gas on solid were first revealed. "Fluidized pressurization", which effectively fluidized the solid and improved the subsequent hopper discharge, was then developed. The effect of hopper pressure on the discharge of pulverized coal was studied. Our experimental results showed that the gas volumetric flow rate increased and the gas superficial velocity decreased with the increase of the hopper pressure in the range of 0―1800 kPa. It was confirmed that more energy was needed; the uncertainty and instability was increased to discharge pulverized coal at higher pressures. Gas momentum flux was defined and used to describe the effect of aeration. The optimum gas momentum flux, which was independent of the hopper pressure, was obtained on the basis of the experimental data. The optimum gas volumetric flow rates and the optimum gas superficial velocities corresponding to the maximum solid discharge rates were further predicted, which agreed well with the experimental data. On the other hand, the hopper pressure also showed a positive effect on the solid discharge, as the maximum solid discharge rate increased gradually with the hopper pressure until a limit value of about 8000 kg/ h was reached at 800 kPa. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508208