International Scientific Journal

Thermal Science - Online First

online first only

Numerical simulation of altering the raw meal inlet position in a novel swirl precalciner

Conducted a numerical simulation to model a novel swirl precalciner, investigating how altering in the position of the raw meal inlet affects the internal gas flow, temperature field, and component concentration field within the precalciner. Applied the Realizable k-ε two-equation turbulent model to the continuous phase. For the particle phase (pulverized coal), employed the Discrete Particle Model and the discrete random walk model. Simulated the combustion of pulverized coal and the decomposition of calcium carbonate by using the Species Transport model combined with the Finite-Rate/Eddy-Dissipation model. Modeled the generation of NOx using a NOx model. The results show that, in comparison to the condition with four raw meal inlets, the six raw meal inlets condition has a better coupling of pulverized coal combustion and raw meal decomposition. The decomposition rate of raw meal has seen a slight improvement, and there is a significant improvement in the occurrence of localized high temperatures within the precalciner, resulting in a reduction of the outlet NOx concentration from 1251 ppm to 225 ppm.
PAPER REVISED: 2024-03-01
PAPER ACCEPTED: 2024-03-07
  1. Guo, Y., et al., A Review of Low-Carbon Technologies and Projects for The Global Cement Industry, J. Environ. Sci., 136 (2024), pp. 682-697
  2. Dinga, C.D., Wen, Z., China's Green Deal: Can China's Cement Industry Achieve Carbon Neutral Emissions By 2060?, Renew. Sustain. Energy Rev., 155 (2022), pp. 111931
  3. Li, D., et al., Experimental Study and CFD Modeling of NOx Reduction and Reductive Gas Formation in Deep Reburning of Cement Precalciner, Fuel Process. Technol., 229 (2022), pp. 107183
  4. Sharma, P., et al., Aspen Plus Simulation of an Inline Calciner for White Cement Production with A Fuel Mix of Petcoke and Producer Gas, Energy, 282 (2023), pp. 128892
  5. Zhang, L., et al., Numerical Simulation of Oxy-Fuel Combustion with Different O2/CO2 Fractions in a Large Cement Precalciner, Energy Fuels, 34 (2020), 4, pp. 4949-4957
  6. Nakhaei, M., et al., CPFD Simulation of Petcoke and SRF Co-Firing in a Full-Scale Cement Calciner, Fuel Process. Technol., 196 (2019), pp. 106153
  7. Wang, B., Kao, H., Numerical Simulation of O2/CO2 Combustion in Decomposition Furnace, Therm. Sci., (2023), 00, pp. 73-73
  8. Yang, Y., et al., Numerical Simulation of Low Nitrogen Oxides Emissions Through Cement Precalciner Structure and Parameter Optimization, Chemosphere, 258 (2020), pp. 127420
  9. Wang, B., Kao, H., Numerical Simulation of O2/CO2 Combustion in Decomposition Furnace, Therm. Sci., 27 (2023), 5 Part B, pp. 4307-4320
  10. Mei, S., et al., Numerical Simulation of the Complex Thermal Processes in a Vortexing Precalciner, Appl. Therm. Eng., 125 (2017), pp. 652-661
  11. Liu, Y., Kao, H., Numerical Simulation of Urea Based SNCR Process in a Trinal-Sprayed Precalciner, J. Renew. Mater., 9 (2021), 2, pp. 269
  12. Zhang, L., et al., Numerical Simulation of SNCR Denitration in Cement Precalciner, J. USST., 41 (2019), 1, pp. 14-21(in Chinese)
  13. Gao, R., et al., Numerical Simulation of Co-Combustion of Pulverized Coal and Biomass in TTF Precalciner, Fuel, 334 (2023), pp. 126515
  14. Zhu, J., Kao, H., Numerical Simulation of Co-Combustion of Pulverized Coal and Different Proportions of Refused Derived Fuel in TTF Precalciner, J. Renew. Mater., 9 (2021), 7, pp. 1329-1343
  15. Mikulčić, H., et al., Numerical Evaluation of Different Pulverized Coal and Solid Recovered Fuel Co-Firing Modes Inside a Large-Scale Cement Calciner, Appl. Energy, 184 (2016), pp. 1292-1305
  16. Shih, T.-H., et al., A New K-epsilon Eddy Viscosity Model for High Reynolds Number Turbulent Flows: Model Development and Validation, Report No. CMOTT-94-6, August 1, 1994
  17. Rohdin, P., Moshfegh, B., Numerical Predictions of Indoor Climate in Large Industrial Premises. A Comparison Between Different K-ε Models Supported by Field Measurements, Build. Environ., 42 (2007), 11, pp. 3872-3882
  18. Lateb, M., et al., Comparison of Various Types of K-ε Models for Pollutant Emissions Around a Two-Building Configuration, J. Wind Eng. Ind. Aerodyn., 115 (2013), pp. 9-21
  19. Shaheed, R., et al., A Comparison of Standard K-ε and Realizable K-ε Turbulence Models in Curved and Confluent Channels, Environ. Fluid Mech., 19 (2019), 2, pp. 543-568
  20. BAUM, M.M., STREET, P.J., Predicting The Combustion Behaviour of Coal Particles, Combust. Sci. Technol., 3 (1971), 5, pp. 231-243
  21. Field, M.A., Rate of Combustion of Size-Graded Fractions of Char from a Low-Rank Coal Between 1 200°K and 2 000°K, Combust. Flame, 13 (1969), 3, pp. 237-252
  22. Toporov, D., et al., Detailed Investigation of a Pulverized Fuel Swirl Flame in CO2/O2 Atmosphere, Combust. Flame, 155 (2008), 4, pp. 605-618
  23. Mao, Y., et al., Numerical Modelling of Multiphase Flow and Calcination Process in an Industrial Calciner with Fuel of Heavy Oil, Powder Technol., 363 (2020), pp. 387-397
  24. Hu, N., Scaroni, A.W., Calcination of Pulverized Limestone Particles Under Furnace Injection Conditions, Fuel, 75 (1996), 2, pp. 177-186
  25. Borgwardt, R.H., Calcination Kinetics and Surface Area of Dispersed Limestone Particles, AIChE J., 31 (1985), 1, pp. 103-111
  26. Baker, E.H., 87. The Calcium Oxide-Carbon Dioxide System in The Pressure Range 1—300 Atmospheres, J Chem Soc, 0 (1962), 0, pp. 464-470
  27. CHENG, P., Two-Dimensional Radiating Gas Flow by a Moment Method, AIAA J., 2 (1964), 9, pp. 1662-1664
  28. Zeldvich, Y.B., The Oxidation of Nitrogen in Combustion and Explosions, J Acta Physicochim., 21 (1946), pp. 577