پیوندهای مفید
اخبار و اعلانات
آمار
| تعداد نشریات | 158 |
| تعداد شماره‌ها | 6,225 |
| تعداد مقالات | 67,685 |
| تعداد مشاهده مقاله | 114,965,739 |
| تعداد دریافت فایل اصل مقاله | 89,639,539 |
A Numerical Study on Agglomeration in High Temperature Fluidized beds | ||
| Journal of Chemical and Petroleum Engineering | ||
| مقاله 2، دوره 48، شماره 1، شهریور 2014، صفحه 15-25 اصل مقاله (405.48 K) | ||
| نوع مقاله: Original Paper | ||
| شناسه دیجیتال (DOI): 10.22059/jchpe.2014.5583 | ||
| نویسندگان | ||
| Zahra Mansourpour* 1؛ Navid Mostoufi2؛ Rahmat Sotudeh-Gharebagh1 | ||
| 1School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| 2University of Tehran | ||
| چکیده | ||
| Soft-sphere discrete element method (DEM) and Navier-Stokes equations were coupled with equations of energy for gas and solids to investigate the process of agglomeration in fluidized bed of polyethylene particles at high temperature. The Newton’s second law of motion was adapted for translational and rotational motion of particles and agglomerates. The cohesive force for polyethylene particles was calculated based on a time dependent model for solid bridging by the viscous flow mechanism. The motion of agglomerates was described by means of the multi-sphere method. By taking into account the cohesiveness of particles at high temperatures and considering real dynamic agglomerates, the fluidization behavior of a bed of polyethylene particles was successfully simulated in terms of increasing the size of agglomerates. Effect of the inlet gas temperature on mass and size of agglomerates was investigated. A mechanistic study in terms of contact time, cohesive force and repulsive force, which are the key parameters in the formation of agglomerates, were also carried out. | ||
| کلیدواژه‌ها | ||
| Agglomeration؛ Discrete element method؛ Fluidized bed؛ High temperature solid bridge | ||
| مراجع | ||
|
[1] Anderson, T.B. and Jackson, R.A. (1967). "Fluid mechanical description of fluidized beds: Equations of motion." Ind. Eng. Chem. Fund., Vol. 6, pp. 527-539.
[2] Cundall, P.A. and Strack, O.D.L. (1979). "A discrete numerical model for granular assemblies." Geo technique, Vol. 29, pp. 47–65.
[3] Deen, N.G., Annaland, Van Sint M., Van der Hoef, M.A. and Kuipers, J.A.M. (2007). "Review of discrete particle modeling of fluidized beds." Chem. Eng. Sci., Vol. 62, pp. 28-44.
[4] Mikami, T., Kamiya, H. and Horio, M. (1998). "Numerical simulation of cohesive powder behavior in a fluidized bed." Chem. Eng. Sci., Vol. 53 No. 10, pp.1927-1940.
[5] Iwadate, Y. and Horio, M. (1998). "Prediction of agglomerate sizes in bubbling fluidized beds of group C powder." Powder Technol., Vol. 100, pp. 223-236.
[6] Li, Sh., Marshall, J. S., Liu, G. and Yao, Q. (2013) "Adhesive particulate flow: The discrete-element method and its application in energy and environmental engineering.” Progr. Energ. Combust. Sci., Vol. 37, pp. 633-668.
[7] Kuwagi, K., Mikami, T. and Horio, M. (2000). "Numerical simulation of metallic solid bridge particles in a fluidized bed at high temperature." Powder Technol., Vol. 109, pp.27-40.
[8] Mansourpour, Z., Mostoufi, N. and Sotoudeh-Gharebagh, R. (2013). "A mechanistic study of agglomeration in fluidized beds at elevated pressures." The Canadian J. Chem. Eng., Vol. 91, pp. 560-569.
[9] Mansourpour, Z., Mostoufi, N. and Sotoudeh-Gharebagh, R. (2014). "Investigating agglomeration phenomena in an air-polyethylene fluidized bed using DEM–CFD approach." Chem. Eng. Res. Des., Vol. 92, pp. 102-118.
[10] Mansourpour, Z., Karimi, S. Zarghami, R., Mostoufi, N. and Sotoudeh-Gharebagh, R. (2010). "Insights in hydrodynamics of bubbling fluidized beds at elevated pressure by DEM–CFD approach." Particuology, Vol. 8, pp. 404-414.
[11] Kruggel-Emden, H., Rickelt, S. Wirtz, S. and Scherer, V. (2008). "A study on the validity of the multisphere discrete element method." Powder Technol., Vol. 188, pp. 153-165.
[12] Seville, J.P.K., Willett, C.D. and Knight, P.C. (2000). "Interparticle forces in fluidization: a review." Powder Technol., Vol. 113, pp. 261-268.
[13] Seville, J.P.K., Silomon-Pflug, H. and Knight, P.C. (1998). "Modeling of sintering in high temperature gas fluidization." Powder Technol., Vol. 97, pp.160-169. | ||
|
آمار تعداد مشاهده مقاله: 3,024 تعداد دریافت فایل اصل مقاله: 4,121 |
||