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CFD Study on the Effect of Primary Air on Combustion of Simulated MSW Process in the Fixed Bed

Authors: Rui Sun, Tamer M. Ismail, Xiaohan Ren, M. Abd El-Salam


Incineration of municipal solid waste (MSW) is one of the key scopes in the global clean energy strategy. A computational fluid dynamics (CFD) model was established in order to reveal these features of the combustion process in a fixed porous bed of MSW. Transporting equations and process rate equations of the waste bed were modeled and set up to describe the incineration process, according to the local thermal conditions and waste property characters. Gas phase turbulence was modeled using k-ε turbulent model and the particle phase was modeled using the kinetic theory of granular flow. The heterogeneous reaction rates were determined using Arrhenius eddy dissipation and the Arrhenius-diffusion reaction rates. The effects of primary air flow rate and temperature in the burning process of simulated MSW are investigated experimentally and numerically. The simulation results in bed are accordant with experimental data well. The model provides detailed information on burning processes in the fixed bed, which is otherwise very difficult to obtain by conventional experimental techniques.

Keywords: fixed bed, computational fluid dynamics (CFD) model, municipal solid waste (MSW), primary air, Waste Incineration

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[1] Ligang Liang, Rui Sun, Qiang Guo, Kui Dai, Shaohua Wu. Experimental Study on Combustion of Simulated Municipal Solid Wastes in a Fixed Bed. 4th i-CIPEC, September 26-29, 2006, Kyoto, Japan.
[2] H. Thunman, L-E. Amand, F. Ghirelli, et al. Modelling and verifying experiments on the whole furnace principles and models of solid fuel combustion. Chalmers University of Technology, 2001.
[3] M.J.V. Goldschmidt, R. Beetstra, J.A.M. Kuipers, Hydrodynamic modeling of dense gas-fluidized beds: comparison of the kinetic theory of granular flow with 3D hard-sphere discrete particle simulations, Chemical Engineering Science, 57 (2002), 2059–2075.
[4] S. Benyahia, H. Arastoopour, T.M. Knowlton, H. Massah, Simulation of particles and gas flow behavior in the riser section of a circulating fluidized bed using the kinetic theory approach for the particulate phase, Powder Technology 112 (2000), 24–33.
[5] P.T. Radulovic, M.U. Ghani, L.D. Smoot, An improved model for fixed bed coal combustion and gasification, Fuel 74 (1995), 582–594.
[6] Y. B. Yang, V. N. Sharifi, J. Swithenbank. Effect of air flow rate and fuel moisture on the burning behaviours of biomass and simulated municipal solid wastes in packed beds. Fuel, 2004, 83(11-12): 1553- 1562
[7] Y. B. Yang, H. Yamauchi, V. Nasserzadeh, et al. Effects of fuel devolatilization on the combustion of wood chips and incineration of simulated municipal solid wastes in a packed bed. Fuel, 2003, 82(18): 2205-2221
[8] C. Ryu, D. Shin, S. Choi. Effect of fuel layer mixing in the waste bed combustion. Advances in Environmental Research, 2001, 5(3): 259-267
[9] J. J. Saastanainen, R. Taipale, M. Horttanainen, et al. Propagation of the ignition front in beds of wood particles. Combustion and Flame, 2000, 123(1-2): 214-226
[10] Y. R. Goh, R. G. Siddall, V. Nasserzadeh, et al. Mathematical modeling of the waste incinerator burning bed. J Inst Energy, 1998, 71: 110-118
[11] Y. R .Goh, C. N. Lim, K.H. Chan, et al. Mixing, modelling and measurements of incinerator bed combustion. The Second International Symposium on Incineration and Flue Gas Treatment Technology, 1999: 4-6
[12] R. Zakaria, Y. R. Goh, Y. B. Yang, et al. Reduction of NOx emission from the burning bed in a municipal solid waste incinerator. The Fifth European Conference on Industrial Furnaces and Boilers, Espinho- Porto-Portugal, 2000: 11-14
[13] M. Rönnbäck, M. Axell, L. Gustavsson. Combustion processes in a biomass fuel bed–experimental results. Progress in Thermochemical Conversion, Tyrol, Austria, 2000, 17-22
[14] V. N. Sharifi. Optimization study of incineration in a MSW incinerator with a vertical radiation Shaft. PhD Thesis. 1990
[15] Y. Tsuji, Activities in discrete particle simulation in Japan, Powder Technology 113 (2000), 278–286.
[16] P.D. Cudall, O.D.L.A. Strack, Discrete numerical model for granular assemblies, Geotechnique 29 (1979), 47–65.
[17] J. Ding, D. Gidaspow, A bubbling fluidization model using kinetic theory of granular flow, AIChE Journal 36 (1990), 523–538.
[18] D. Gidaspow, Multiphase Flow and Fluidization: Continuum and Kinetic Theory Description, Academic Press, San Diego, 1994.
[19] Rui Sun, Tamer M. Ismail, Xiaohan Ren, M. Abd El-Salam. Numerical and Experimental Studies on Effects of Moisture Content on Combustion Characteristics of Simulated Municipal Solid Wastes in a Fixed Bed. Waste Management in Press, Corrected Proof, Available online 4 March 2015.
[20] T.M. Ismail, M. Abd El-Salam, M.A. El-Kady, S.M. El-Haggar, Three dimensional model of transport and chemical late phenomena on a MSW incinerator, International Journal of Thermal Sciences 77 (2014), 139- 157.
[21] Ligang Liang, Rui Sun, Jun Fei, Shaohua Wu, Xiang Liu, Kui Dai, Na Yao, Experimental study on effects of moisture content on combustion characteristics of simulated municipal solid wastes in a fixed bed, Bioresource Technology 99 (2008) 7238–7246.
[22] B. Peters, N. Thomas, B. Christian, 2003. Modeling wood combustion under fixed bed conditions. Fuel, 82, 729–738.
[23] De Soete, G.G., 1975. Overall reaction rates of NO and N2 formation from fuel nitrogen. In: Fifteenth Symposium (International) on Combustion. The Combustion Institute, Pittsburgh, PA, pp. 1093–1102.
[24] S. C. Hill, L. D. Smoot., 2000. Modeling of nitrogen oxides formation and destruction in combustion systems. Progress in Energy and Combustion Science 26(4): 417-458.
[25] Levy JM, Chen LK, Sarofim AF, Baer JM. Eighteenth Symposium (International) on Combustion, the Combustion Institute, Pittsburgh, PA, 1981. p. 111.
[26] Di Blasi C, 2004. Modeling wood gasification in a countercurrent fixedbed reactor, AIChE Journal, 50, 9.
[27] J. Cooper, W. L. H. Hallett, 2000. A Numerical Model for Packed-Bed Combustion of Char Particles. Chemical Engineering Science, 55, 4451– 4460.
[28] Launder, b. E. and Spalding, D. B. The numerical computations of turbulent flows. 1974.
[29] D. Gidaspow, 1994. A Bubbling Fluidization Model Using Kinetic Theory of Granular Flow. AIChE Journal, 32, 1, 523–538.
[30] S. Hermann, 1979. Boundary layer theory. McGraw-Hill, Seventh Edition.
[31] H. Arastoopour, 2001. Numerical simulation and experimental analysis of gas-solid flow systems: 1999 fluor-daniel plenary lecture, Powder Technology, 119, 59-67.
[32] Rosseland, S., Theoretical Astrophysics: Atomic Theory and the Analysis of Stellar Atmospheres and Envelopes, Oxford, UK: Clarendon, 1936.
[33] S.V. Patankar, Numerical Heat Transfer and Fluid Flow, Hemisphere, 1980.
[34] W.Q. Tao, Numerical Heat Transfer, second ed., Xi’an Jiaotong University, Xi’an, 2001.
[35] D. Shin, S. Choi. The combustion of simulated waste particles in a fixed bed. Combustion and Flame, 2000, 121 (1-2): 167-180.
[36] Zhou, H., Jensen, A.D., Glarborg, P., et al., 2005. Numerical modeling of straw combustion in a fixed bed. Fuel 84 (4), 389–403.