Modeling and Simulation of a Separate Line Calciner Fueled with a Mixture of Coal and Rice Husk

https://doi.org/10.22146/ajche.50093

Sunu Herwi Pranolo(1), Yazid Bindar(2), Dwiwahju Sasongko(3), Herri Susanto(4*)

(1) Chemical Engineering Study Program, Faculty of Industrial Technology – ITB, Jl. Ganesha 10, Bandung 40132, Indonesia
(2) Chemical Engineering Study Program, Faculty of Industrial Technology – ITB, Jl. Ganesha 10, Bandung 40132, Indonesia
(3) Chemical Engineering Study Program, Faculty of Industrial Technology – ITB, Jl. Ganesha 10, Bandung 40132, Indonesia
(4) Chemical Engineering Study Program, Faculty of Industrial Technology – ITB, Jl. Ganesha 10, Bandung 40132, Indonesia
(*) Corresponding Author

Abstract


A model has been made to predict performance of a calciner in a cement plant for the use of rice husk as partial substitution of coal. The calciner was assumed as a plug flow reactor with no-mass and heat transfer limitations. The model was composed of three equations of calcination, coal and rice husk combustions with kinetic parameters obtained from literature. Two of 20 sets of operation data were used as base-lines for simulations, namely: Case-A from operation at a capacity of 532 ton h-1 of kiln feed (KF) with coal as a fuel; and Case-B at 530 ton h-1 with 20% rice husk in a mixed fuel. Two simulations were executed at constant total fuel mass flow-rate (21.94 ton h-1 of Case-A and 27.39 ton h-1 of Case-B) and at constant total energy supplied (0.946 and 1.188 GJ ton-1 KF for Case-A and Case-B respectively). Our simulation showed that a target CaCO3 conversion could be obtained using mixed fuel with maintaining constant total energy supplied instead of constant total fuel mass flow-rate. In Case-A as base-line, the use of mixed fuel with 20% rice husk with maintaining constant supplied energy would give a coal saving of 11.8%. This operation however would require an increase in specific fuel consumption from 0.0412 to 0.0455 ton ton-1 of KF. In Case-B as base-line, the CaCO3 conversion of 95% could be obtained with a mixed fuel with rice husk mass fraction up to 40%.

Keywords


calcination, coal, rice husk, co-combustion

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References

  1. Ballester, J., & Jiménez, S. (2005). Kinetic parameters for the oxidation of pulverized coal as measured from drop tube tests. Combustion and Flame, 142, 210 – 222.
  2. Hartiniati, S.A., & Youvial, M. (1989). Performance of a pilot scale fluidized bed gasifier fueled by rice husks. Proceedings of an international conference, Luxembuourg, Elsevier App.Sc. Pub., 257 – 263.
  3. Khinast, J., Krammer, G.F., Brunner, Ch., & Staudinger, G. (1996). Decompositon of limestone – The influence of CO2 and particle size on the reaction rate. Chem. Engg. Science, 51(4), 623 – 634.
  4. Mansaray, K.G., & Ghaly, A.E. (1999). Determination of kinetic parameters of rice husks in oxygen using thermogravimetric analysis, Biomass and Bioenergy, 17, 19 – 31.
  5. Nugroho, Y.S., McIntosh, A.C., dan Gibbs, B.M. (1998). Using the crossing point method to assess the self-heating behavior of Indonesian coals, Proceedings of the 27th Symposium (International) on Combustion – The Combustion Institute, 2981 – 2989.
  6. Pranolo, S.H. and Susanto, H. (2009). Technical evaluation on the use of rice husk as partial substitution of coal for fuel in a calciner. Paper presented in the Third International Symposium on Novel Carbon Resource Sciences, Kyushu University, Fukuoka, Japan, November 2009.



DOI: https://doi.org/10.22146/ajche.50093

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