Separation of unburned carbon from fly ash using a concurrent flotation column

Date

2009-12-01

Author

Altun, Naci Emre
Hwang, J Y

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

220
views

0
downloads

In this study. a new concurrent flotation column that simulates the plug flow reactor was designed with the use of a static mixer, a froth separator column and an optional additional bubble generator for fly ash beneficiation. The objective was to improve the efficiency and effectiveness of unburned carbon removal from fly ash by minimizing energy costs. Cleaning tests were performed with and without the additional bubble genarator. Without the additional bubble generator unburned carbon in the ash product could be reduced to only 2.53%. Incidental loss of carbon particles and insufficient bubble generation were the main causes of poor carbon separation performance. By turning on the additional bubble generator it was aimed to assist bubble generation, to compensate bubble rupture and to recapture the detached or free carbon particles leaving the froth phase. With the additional bubble generator and under optimized conditions a froth product with 95% carbon recovery and a cleaned ash product with less than 1% unburned carbon was obtained. The separation process through the static mixer (feeder) and the separator column and the energy consumption of the unit were analyzed. It was seen that around 80% energy could be saved with the concurrent flotation column compared to conventional flotation.

Subject Keywords

Fuel Technology, Energy Engineering and Power Technology, General Chemical Engineering

URI

https://hdl.handle.net/11511/46876

Journal

FUEL PROCESSING TECHNOLOGY

DOI

https://doi.org/10.1016/j.fuproc.2009.06.029

Collections

Department of Mining Engineering, Article

Suggestions

OpenMETU
Core

Gas production from hydrate resevoirs Alp, Doruk; Parlaktuma, Mahmut; Department of Petroleum and Natural Gas Engineering (2005) In this study; gas production by depressurization method from a hydrate reservoir containing free gas zone below the hydrate zone is numerically modeled through 3 dimensional, 3 phase, non-isothermal reservoir simulation. The endothermic nature of hydrate decomposition requires modeling to be non-isothermal; hence energy balance equations must be employed in the simulation process. TOUGH-Fx, the successor of the well known multipurpose reservoir simulator TOUGH2 (Pruess [24]) and its very first module TOUGH...
The Coastal circulation model of Büyük Menderes river mouth and adjacent coastal areas Gözlet, Mehmet Sedat; Özyurt Tarakcıoğlu, Gülizar; Baykal, Cüneyt; Department of Civil Engineering (2019) In this study; coastal circulation of Buyuk Menders river mouth and the adjacent coastal areas is modeled to determine the current characteristics of the region under river-sea interaction. For this purpose, Finite Volume Coastal Ocean Model (FVCOM) numerical model is setup and run under wind, tide, and river forcing conditions. Current, salinity, temperature data from field measurements are used to validate the performance of the model setup with default parametrization. Significance of each forcing on the...
Investigation of turbulence models used in automotive industry Taştan, Umur; Çetinkaya, Tahsin Ali; Department of Mechanical Engineering (2011) In this study; reliability and performance of turbulence models used in CFD softwares to determine the aerodynamics of passenger cars, are tested and compared. In the analyses, drag forces acting on the car, pressure and velocity distributions and wake flow patterns are determined by using several turbulence models with a commercial software Fluent. Calculated results compared to the experimental results given in the literature. It is observed that, turbulence models give relatively reliable results for det...
Substituted quinoxaline and benzimidazole containing monomers as long wavelength photosensitizers for diaryliodonium salt initiators in photopolymerization Çorakçı, Bengisu; Toppare, Levent Kamil; Çırpan, Ali; Department of Chemistry (2013) In this study; ferrocenyl and naphthalenyl substituted quinoxaline derivatives; 5,8- bis (2,3- dihydrothieno [3,4-b] [1,4] dioxin-5-yl)-2- (naphthalen-2-yl)- 3- ferrocenyl- 4a,8a-dihydroquinoxaline; 5,8- bis (2,3-dihydrothieno [3,4-b] [1,4]dioxin-5-yl) -2- (phenyl) -3-ferrocenylquinoxaline; 5,8-bis (2,3-dihydrothieno [3,4-b] [1,4]dioxin-5-yl) -2,3- di(naphthalen-2-yl)quinoxaline and trihexylthiophene and thiophene coupled benzimidazole derivatives; 4-(tert-butyl)-4,7-bis(4-hexylthiophen-2-yl)spiro[benzo[d]i...
Thermoluminescent properties of Sr2P2O7 doped with copper and some rare earth elements YAZICI, AHMET NECMEDDİN; Seyyidoglu, Semih; Toktamis, Hueseyin; Yılmaz, Ayşen (2010-10-01) In this study. Sr2P2O7 was doped with some rare earth oxides (Pr6O11, Nd2O3, Dy2O3, Ho2O3, Er2O3, and Tm2O3) at 0.5%, 1%, 2%, 3%, 4%, 5%, 10%, and 15% (by weight) and co-doped with CuO by heating at 900 C for 10 h. Structural analysis of the products was carried out by powder X-ray diffraction (XRD). XRD patterns of the samples showed that doping did not alter the orthorhombic structure of the Sr2P2O7. Thermoluminescence (TL) glow curve measurements were obtained and these showed that Pr and Cu-doped Sr2P2O...

Citation Formats

N. E. Altun and J. Y. Hwang, “Separation of unburned carbon from fly ash using a concurrent flotation column,” FUEL PROCESSING TECHNOLOGY, pp. 1464–1470, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46876.