Numerical Investigation of New Cooling Method for Clinker Flow in Opposite Direction with Airflow at Different Height Ratios

Abstract:

Several parameters affect the properties of Portland cement and one of these parameters is the cooling rate of the clinker. If the effectiveness of the cooling method of the clinker increases, a good enhancement in the properties of Portland cement will be found. Depending on the new cooling method suggestion by Nasr et. al. [20], the counter pattern of air clinker flow was studied using (FLUENT 6.3.26). The dimensions of the cooling room in grate cooler, the constant mass flow rate of both clinker and air, different height ratios, and different clinker porosity were considered in this numerical work. The results show that the heat transfers in the first half of the cooling room (0 < X < 0.9 m) is larger than that in the second half (0.9 < X < 1.8 m), and this leads to an increase in the temperature of outlet air so can benefits from it in the heating of furnace. When the clinker and air are flowing in the counter direction, the cooling method is more beneficial when compared with that of parallel flow because the exiting clinker has a great rate of cooler and the air exits from the grate cooler is loaded with large thermal energy. Finally, it can design the best length of gate according to the required clinker temperature at the outlet side, and this results to reduce the cost of the cooling process according to the temperature distribution results at (0 < X > 1.8m) for different porosity and H.R values.

• Periodical: Key Engineering Materials (Volume 895)
• Pages: 157-176
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.895.157
• Online since: August 2021
• Authors: Nasr A. Jabbar*, Ali Amer Alshammary, Ihsan Y. Hussain, Luay S. Alansari
• Keywords: CFD, Clinker, Cooling Process, Forced Convection, Porosity

References

[1] V.C. Johansen, L.M. Hills, F.M. Miller and R.W. Stevenson, The Importance of Cement Raw Mix Homogeneity, International Cement, Chicago, USA, online on America's Cement (2003). http://cementamericas.com/mag/cement_importance_cement_raw/.

DOI: 10.1109/citcon.2002.1006501

[2] A. Mohamed, and G. Hesham, Variation of Feed Chemical Composition and Its Effect on Clinker Formation–Simulation Process. Proceedings of the World Congress on Engineering and Computer Science, WCECS, 20-22, San Francisco, USA, (2010).

[3] A. B. Robert, Effect of cooling rates on mineralization in portland cement clinker, University of Missouri-Kansas, Kansas City, Missouri(2015).

[4] Y. Ono, Microscopical observations of clinker for the estimation of burning condition, grindability, and hydraulic activity, Proceedings of the Third International Conference on Cement Microscopy, International Cement Microscopy Association, Houston, Texas, 198-210, (1981).

[5] G.W. Ward, Effect of heat treatment and cooling rate on the microscopic structure of portland cement clinker, Journal of Research of the National Bureau of Standards, 26, 49-64, (1941).

DOI: 10.6028/jres.026.035

[6] D. H. Campbell, Microscopical examination and interpretation of portland cement and clinker, Portland Cement Association, Skokie, IL, 201, (1999).

[7] I. Maki, and K. Goto, Factors influencing the phase constitution of a lite in Portland cement clinker, Cement and Concrete Research, 12, 301- 308, (1982).

DOI: 10.1016/0008-8846(82)90078-3

[8] I. Maki, Processing conditions of portland cement clinker as viewed from the fine textures of the constituent minerals. Ceramic Transactions, 40, 3-17, (1994).

[9] F. M. Lea, The chemistry of cement and concrete, Chemical Publishing Inc., New York, 1092, (1972).

[10] G.W. Ward, Effect of heat treatment and cooling rate on the microscopic structure of portland cement clinker, Journal of Research of the National Bureau of Standards, 26, 49-64, (1941).

DOI: 10.6028/jres.026.035

[11] Y. Ono, S. Kawamura, and Y. Soda, Microscopic observations of alite and belite and hydraulic strength of cement. Fifth International Symposium on Chemistry of Cement, Tokyo, 1, 275-284, (1968).

[12] Y. Ono, Microscopical observations of clinker for the estimation of burning condition, grindability, and hydraulic activity. Proceedings of the Third International Conference on Cement Microscopy, International Cement Microscopy Association, Houston, Texas, 198-210, (1981).

[13] M. H. Zaid, Thermal analysis of the grate clinker cooler. M.Sc. Thesis, University of Kufa, (2002).

[14] G. Locher, Mathematical models for the cement clinker burning process, Part 4. Grate cooler [J], ZKG-International, 22 (6), 46-57, (2002).

[15] D. Touil, H. F. Belabed, C. Frances, and S. BelaadiHeat exchange modeling of a grate clinker cooler and entropy production analysis, Heat and Technology, 23 (1),61-68, (2005).

[16] K. S. Mujumdar, K. V. Ganesh, S. B. Kulkarni, and V. V. Ranade, Rotary cement kiln simulator (RoCKS): Integrated modeling of pre-heater, Journal of Calciner, Kiln and Clinker Cooler, Chemical Engineering Science, 62 (9), 2590-2607, (2007).

DOI: 10.1016/j.ces.2007.01.063

[17] X. H. Zhang, J. Y. Zhang, C. D Dai, and D. J. Xie, Optimization and simulation of sinter cooling process, CIESC Journal, 62 (11), 3081-3087, (2011).

[18] Y. Wen, N. Li, and B. Liu, Investigation on the heat transfer model of the cement, Bulletin of the Chinese Ceramic Society, 30 (6), 1381-1385, (2011).

[19] K. C. Zheng, Z. Wen, X. L. Liu, G. F. Lou, X. Zhang, Y. G. Zhang, W. F. Wu, Investigating the general mathematics model of gas-solid heat transfer in the cooling process of high-temperature clinker and sintered material, Energy for Metallurgical Industry, 29 (2), 27-30.clinker . Bulletin of the Chinese Ceramic Society, 30 (6), 1381-1385, (2010).

[20] A. J. Nasr, M. J. ALshukri, W. A. Rasheed, I. Y. Hussain, Numerical investigation of a new cooling method for clinker flow in parallel with airflow at different height ratios, International Journal of Mechanical & Mechatronics Engineering IJMME-IJENS18 (03),1-17, (2018).

[21] D. Maziar, S. V Mohammad, and S. Seyfolah, Perturbation analysis of the local thermal non-equilibrium condition in a fluid-saturated porous medium bounded by an isothermal channel, Springer Science+Business Media Dordrecht, Transp Porous Med DOI 10.1007/s11242-013-0267-2, (2014).

DOI: 10.1007/s11242-013-0267-2

[22] D Maziar, S. V. Mohammad, S. Seyfolah, Temperature-dependent conductivity in forced convection of heat exchangers filled with porous media: A perturbation solution. Energy Conversion and Management, 91, 259–266, (2015).

DOI: 10.1016/j.enconman.2014.12.011

[23] A. Y. Aya, and Y. h. Ihsan, Experimental and numerical investigation of forced convection in a porous medium subjected to constant heat flux. M.Sc. Thesis, University of Baghdad, College of Engr. Mech. Engr. Dept, (2013).

[24] Y. Yao, S. Ding, and Y. Chen, Modeling of the thermal e_ciency of a whole cement clinker calcination system and its application on a 5000 mt/d production line, Energies, 13(20), 5257, (2020).

DOI: 10.3390/en13205257

[25] Y. K. Verma, B. Mazumdar, and P. Ghosh, Thermal energy consumption and its conservation for a cement production unit, Environ Eng Res, 26(3), (2021).