Browse > Article
http://dx.doi.org/10.9713/kcer.2016.54.4.533

Flow Behavior and Mixing Characteristics of Rice Husk/Silica Sand/Rice Husk Ash  

Kim, Bo Hwa (Climate change research division, Korea Institute of Energy Research (KIER))
Seo, Myung Won (Climate change research division, Korea Institute of Energy Research (KIER))
Kook, Jin Woo (Climate change research division, Korea Institute of Energy Research (KIER))
Choi, Hee Mang (Climate change research division, Korea Institute of Energy Research (KIER))
Ra, Ho Won (Climate change research division, Korea Institute of Energy Research (KIER))
Yoon, Sang Jun (Climate change research division, Korea Institute of Energy Research (KIER))
Mun, Tae Young (Climate change research division, Korea Institute of Energy Research (KIER))
Kim, Yong Ku (Climate change research division, Korea Institute of Energy Research (KIER))
Lee, Jae Goo (Climate change research division, Korea Institute of Energy Research (KIER))
Rhee, Young Woo (Graduate School of Energy Science and Technology, Chungnam National University (CNU))
Publication Information
Korean Chemical Engineering Research / v.54, no.4, 2016 , pp. 533-542 More about this Journal
Abstract
We investigate fluidization characteristics of the mixture of rice husk, silica sand and rice husk ash as a preliminary study for valuable utilization of rice husk ash obtained from gasification of rice husk in a fluidized bed reactor. As experiment valuables, the blending ratio of rice husk and sand (rice husk: sand) is selected as 5:95, 10:90, 20:80 and 30:70 on a volume base. Rice husk ash was added with 6 vol% of rice husk for each experiment and air velocity to the reactor was 0~0.63 m/s. In both rice husk/sand and rice husk/sand/ash mixture, the minimum fluidization velocity (Umf) is observed as 0.19~0.21 m/s at feeding of 0~10 vol.% of rice husk and 0.30 m/s at feeding of 20 vol.% of rice husk. With increasing the amount of rice husk up to 30 vol.%, $U_{mf}$ can not measure due to segregation behavior. The mixing index for each experiment is determined using mixing index equation proposed by Brereton and Grace. The mixing index of the mixture of rice husk/sand and rice husk/sand/ash was 0.8~1 and 0.88~1, respectively. The optimum fluidization condition was found for the good mixing and separation of rice husk ash.
Keywords
Rice Husk; Silica Sand; Rice Husk Ash; Flow; Mixing; Fluidized Bed;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Brereton, C. M. H. and Grace, J. R., "Microstructural Aspects of the Behaviour of Circulating Fluidized Beds," Chem. Eng. Sci., 48, 2565-2572(1993).   DOI
2 Kim, D. Y., "A Study on the Flow Characteristics of Fine Particle in a Gas-Solid Fluidized Beds with Binary Particle,"M.S. Dissertation, Sungkyunkwan University(2013).
3 Kim, D. Y., Rim, G. H. and Lee, D. H., "Flow Characteristics and Axial Bed Composition According to Mass Ratio of Binary Solids in Gas-Solid Circulating Fluidised Beds," Powder Technol., 258, 344-351(2014).   DOI
4 Huang, S., Jing, S., Wang, J. F., Wang, Z.W. and Jin, Y., "Silica white Obtained from Rice Husk in a Fluidized Bed," Powder Technology, 117, 232-238(2001).   DOI
5 Sen, R. and Gosh, D. N., "Fluidization and Combustion Characteristics of Rice Husk," Indian Chem. Eng., 34, 206-211(1992).
6 Rozainee, M., Ngo, S. P., Salema, A. A., Tan, K. G., Ariffin, M. and Zainura, Z. N., "Effect of Fluidising Velocity on the Combustion of Rice Husk in a Bench-scale Fluidised Bed Combustor for the Production of Amorphous Rice Husk Ash," Bioresour. Technol., 99, 703-713(2008).   DOI
7 Martinez, J. D., Pineda, T., Lopez, J. P. and Betancur, M., "Assessment of the Rice Husk Lean-combustion in a Bubbling Fluidized Bed for the Production of Amorphous Silica-rich Ash," Energy, 36, 3846-3854(2011).   DOI
8 Chandrasekhar, S., Satyanarayana, K. G., Pramada, P. N. and Raghavan, P., "Review Processing, Properties and Applications of Reactive Silica from Rice Husk-an Overview," J. Mater. Sci., 38, 3159-3168(2003).   DOI
9 Zhang, Y., Jin, B. and Zhong, W., "Experimental Investigation on Mixing and Segregation Behavior of Biomass Particle in Fluidized Bed," Chem. Eng. Process., 48, 745-754(2009).   DOI
10 Formisani, B. and Girimonte, R., "Experimental Analysis of the Fluidization Process of Binary Mixtures of Solids," KONA, 21, 66-75(2003).   DOI
11 Mehdi, A., "Hydrodynamic Modeling of the Entrainment of Geldart A Group Particles in Gas-solid Fluidized Bed: The Effect of Column Diameter," Korean J. Chem. Eng., 28(7), 1599-1607(2011).   DOI
12 Kumar, A., Mohanta, K., Kumar, D. and Parkash, O., "Properties and Industrial Applications of Rice Husk: A Review," International Journal of Emerging Technology and Advanced Engineering, 2, 2250-2459(2012).
13 Lee, W. J., "A Research on the Gas Flow through Nano Space Network in Rice Husk Silica Layer," M.S. Dissertation, Chonnam National University(2013).
14 KIER Research Report, Energy production through rice husk gasification and development of anode materials for rechargeable battery(2014).
15 No, S. Y., "Effective Utilization Methods of Rice Husk," J. Biosystems Eng, 23, 507-518(1998).
16 So, S. J., "Characterization, Size Reduction and Biological Effect of a BPNM, Rice Husk Silica," Ph.D. dissertation, Chonnam National University(2012).
17 Son, S. M., Kim, U. Y., Shin, I. S., Kang, Y. and Choi, M. J., "Characteristics of Minimum Fluidization Velocity and Pressure Fluctuations in Annular Fluidized Beds," Korean Chem. Eng. Res., 46, 707-713(2008).
18 Lee, C. G., Kim, J. S., Song, P. S., Cho, Y. J., Kang, Y. and Choi, M. J., "Effects of Catalyst on the Pyrolysis of Polystyrene Wastes in a Fluidized Bed Catalytic Reactor," HWAHAK KONGHAK, 40, 445-449(2002).
19 Cha, W. S., Hong, S. C., Oh, K. J. and Doh, D. S., "Minimum Fluidization Velocity and Fluidization Characteristics of Binary Particle System," HWAHAK KONGHAK, 30, 641-648(1992).
20 Rao, T. R. and Ram Bheemarasetti, J. V., "Minimum Fluidization Velocities of Mixtures of Biomass and Sands," Energy, 26, 633-644(2001).   DOI
21 Shin, Y. S., "Mixing of Solid Particles in a Sand/Polystyrene Fluidized Bed," Journal Env. Sci. and Tech Res., 10, 49-57(2000).
22 Fang, M., Yang, L., Chen, G., Shi, Z., Luo, Z. and Cen, K., "Experimental Study on Rice Husk Combustion in a Circulating Fluidized Bed," Fuel Process. Technol., 85, 1273-1282(2004).   DOI
23 Alavi, S. and Caussat, B., "Experimental Study on Fluidization of Micronic Powders," Powder Technol., 157, 114-120(2005).   DOI
24 Sharma, A. M., Kumar, A., Patil, K. N. and Huhnke, R. L., "Fluidization Characteristics of a Mixture of Gasifier Solid Residues, Switchgrass and Inert Material," Powder Technol., 235, 661-668(2013).   DOI
25 Geldart, D., "Types of Gas Fluidisation," Powder Technol., 7, 285-292(1973).   DOI
26 Rozainee, M., "Production of Amorphous Silica from Rice Husk in Fluidised Bed System," Ph.D. dissertation, Universiti Teknologi Malaysia(2007).
27 Wen, C. Y. and Yu, Y. H., "A Generalized Method for Predicting the Minimum Fluidising Velocity," AIChE Journal., 12, 610-612(1966).   DOI
28 Haider, A. and Levenspiel, O., "Drag Coefficient and Terminal Velocity of Spherical and Nonspherical Particles," Powder Technol., 58, 63-70(1989).   DOI