Analytical model of the influence of recirculation on premixed combustion of lycopodium dust particles: A study of thermal resistance and random distribution of particles

Document Type : Article


School of Mechanical Engineering, Department of Energy Conversion, Iran University of Science and Technology (IUST), Narmak, Tehran, 16846-13114, Iran.


In this work, a comprehensive mathematical method is developed to model the flame propagation through organic particles with air as a two-phase mixture, considering random distribution and particles thermal resistance. For this purpose, the structure of flame contains a preheat-vaporization zone, a reaction zone where vaporization and convection rates of particles are negligible and a post flame zone where diffusive terms are negligible in comparison of other terms zone. In order to enhance the combustion efficiency, the exhausted heat from the post flame zone is recirculated back to the preheat zone. Since this stream consists of high temperature gaseous mixture, it can enhance the temperature of the initial two-phase mixture entering the combustion chamber. The obtained results show great compatibility with the experimental findings. Apart from the randomness distribution of particles and heat recirculation phenomena, the effect of thermal resistance on the combustion properties such as flame temperature and burning velocity is studied through non-zero Biot numbers in this model. Additionally, the variation of several parameters including equivalence ratio, particle diameter and Lewis number are studied in this research.


Main Subjects

1. Eckho_, R.K., Dust Explosions in the Process Industries: Identi_cation, Assessment and Control of Dust Hazards, Elsevier (2003). 2. Moghadasi, H., Rahbari, A., Bidabadi, M., Poorfar, A.K., and Farhangmehr, V. A mathematical investigation of premixed lycopodium dust ame in a small furnace", Journal of Energy Resources Technology, 141(3), 032201 (2019). 3. Afzalabadi, A., Poorfar, A.K., Bidabadi, M., Moghadasi, H., Hochgreb, S., Rahbari, A., and Dubois, C. Study on hybrid combustion of aero-suspensions of boron-aluminum powders in a quiescent reaction medium", Journal of Loss Prevention in the Process Industries, 49, pp. 645{651 (2017). 4. Moghadasi, H., Malekian, N., Bidabadi, M., and Rasam, H. Analytical modeling of counterow nonpremixed organic particles combustion: Thermal radiation e_ects", Fuel Processing Technology, 185, pp. 139{150 (2019). 5. Bidabadi, M., Xiong, Q., Harati, M., Yaghoubi, E., Doranehgard, M.H., and Rahbari, A. Study on the combustion of micro organic dust particles in random media with considering e_ect of thermal resistance and temperature di_erence between gas and particles", Chemical Engineering and Processing-Process Intensi- _cation, 126, pp. 239{247 (2018). 6. Bidabadi, M., Aghajannezhad, P., Harati, M., Yaghoubi, E., and Shahriari, G. Modeling random combustion of lycopodium particles and gas", International Journal of Spray and Combustion Dynamics, 8(2), pp. 100{111 (2016). 7. Bidabadi, M., Mostafavi, S.A., Dizaji, H.B., and Dizaji, F.F. Lycopodium dust ame characteristics considering char yield", Scientia Iranica., Transactions B, Mechanical Engineering, 20(6), p. 1781 (2013). 8. Bidabadi, M., Panahifar, P., and Sadeghi, S. Analytical development of a model for counter-ow nonpremixed ames with volatile biofuel particles considering drying and vaporization zones with _nite thicknesses", Fuel, 231, pp. 172{186 (2018). 9. Bidabadi, M., Harati, M., Xiong, Q., Yaghoubi, E., Doranehgard, M.H., and Aghajannezhad, P. Volatization & combustion of biomass particles in random media: Mathematical modeling and analyze the e_ect of Lewis number", Chemical Engineering and Processing- Process Intensi_cation, 126, pp. 232{238 (2018). 10. Mostafavi, S.A., Salavati, S., Dizaji, H.B., and Mehdi, B. Pyrolysis and combustion kinetics of lycopodium particles in thermogravimetric analysis", Journal of Central South University, 22(9), pp. 3409{3417 (2015). 11. Proust, C. A few fundamental aspects about ignition and ame propagation in dust clouds", Journal of Loss Prevention in the Process Industries, 19(2{3), pp. 104{ 120 (2006). 12. Proust, C. Flame propagation and combustion in some dust-air mixtures", Journal of Loss Prevention in the Process Industries, 19(1), pp. 89{100 (2006). 13. Han, O.S., Yashima, M., Matsuda, T., Matsui, H., Miyake, A., and Ogawa, T. A study of ame propagation mechanisms in lycopodium dust clouds based on dust particles' behavior", Journal of Loss Prevention in the Process Industries, 14(3), pp. 153{160 (2001). 14. Daou, J. Strained premixed ames: E_ect of heatloss, preferential di_usion and reversibility of the reaction", Combustion Theory and Modelling, 15(4), pp. 437{454 (2011). 15. Bidabadi, M., Fanaee, A., and Rahbari, A. Investigation over the recirculation inuence on the combustion of micro organic dust particles", Applied Mathematics and Mechanics, 31(6), pp. 685{696 (2010). 16. Bidabadi, M. and Rahbari, A. Modeling combustion of lycopodium particles by considering the temperature di_erence between the gas and the particles", Combustion, Explosion, and Shock Waves, 45(3), pp. 278{285 (2009). 17. Rockwell, S.R. and Rangwala, A.S. Modeling of dust air ames", Fire Safety Journal, 59, pp. 22{29 (2013). 18. Moghadasi, H., Malekian, N., Poorfar, A.K., and Bidabadi, M. Thermal radiative study of counterow combustion of porous particles", Chemical Engineering and Processing-Process Intensi_cation, 134, pp. 163{ 173 (2018). 19. Soltaninejad, M., Dizaji, F.F., Dizaji, H.B., and Bidabadi, M. Micro-organic dust combustion considering particles thermal resistance", Journal of Central South University, 22(7), pp. 2833{2840 (2015). 20. Han, O.S., Yashima, M., Matsuda, T., Matsui, H., Miyake, A., and Ogawa, T. Behavior of ames propagating through lycopodium dust clouds in a vertical duct", Journal of Loss Prevention in the Process Industries, 13(6), pp. 449{457 (2000). M. Bidabadi et al./Scientia Iranica, Transactions B: Mechanical Engineering 27 (2020) 2353{2363 2363 21. Seshadri, K., Berlad, A.L., and Tangirala, V. The structure of premixed particle-cloud ames", Combustion and Flame, 89(3{4), pp. 333{342 (1992). 22. Bidabadi, M., Harati, M., Afzalabadi, A., and Rahbari, A. E_ect of thermal resistance on the random combustion of micro-organic dust particles", Journal of Energy Engineering, 144(1), p. 04017073 (2017).