THERMAL SCIENCE

International Scientific Journal

Risto V. Filkoski

,

Ilija J. Petrovski

,

Zlatko Gjurchinovski

ENERGY OPTIMISATION OF VERTICAL SHAFT KILN OPERATION IN THE PROCESS OF DOLOMITE CALCINATION

ABSTRACT
The essential part of the refractory materials production on a basis of sintered dolomite as raw material is the process of dolomite calcination. The technology process usually takes place in shaft or rotary kilns, where the dolomite stone, CaMg(CO3)2, is subjected to a high temperature heat treatment. The calcination of the dolomite is highly endothermic reaction, requiring significant amount of thermal energy to produce sintered dolomite (CaO, MgO), generating a large flow of hot gases at the furnace outlet. The objective of this work was to assess the possibilities of utilization of waste heat of exhaust gases from a shaft kiln in order to improve the overall energy efficiency of the technology process. Several different options were analyzed: (a) preheating of a raw material, (b) preheating of heavy fuel oil, (c) preheating of combustion air, (d) preheating of combustion air and raw material with flue gas, and (e) preheating of air for combustion and for drying of a raw material. Option (e) was selected as the most attractive and therefore it was analyzed in more details, showing significant annual energy savings and relatively short simple payback period on the investment.
KEYWORDS
energy efficiency, shaft kiln, combustion, dolomite calcination, thermal energy recovery
PAPER SUBMITTED: 2018-01-25
PAPER REVISED: 2018-05-25
PAPER ACCEPTED: 2018-05-25
PUBLISHED ONLINE: 2018-09-29
DOI REFERENCE: https://doi.org/10.2298/TSCI180125278F
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 5, PAGES [2123 - 2135]
REFERENCES
  1. Gvozdenac-Urosevic, B., Energy Efficiency and Gross Domestic Product, Thermal Science, 14 (2010), 3, pp. 799-808
  2. Pfeifer, H., Industrial Furnaces ‒ Status and Research Challenges, Energy Procedia, 120 (2017), pp. 28-40
  3. Dolianitis, I., et al., Waste Heat Recovery at the Glass Industry with the Intervention of Batch and Cullet preheating, Thermal Science, 20 (2016), 4, pp. 1245-1258
  4. Stefanovic, G. M., et al., CO2 Reduction Options in Cement Industry ‒ The Popovac Case, Thermal Science, 14 (2010), 3, pp. 671-679
  5. Shahin, H., et al., Thermal Energy Analysis of a Lime Production Process: Rotary Kilm, Preheater and Cooler, Energy Conversion and Management, 114 (2016), Apr., pp. 110-121
  6. Ochoa George, P. A., et al., Cleaner Production in a Small Lime Factory by Means of Process Control, Journal of Cleaner Production, 18 (2010), 12, pp. 1171-1176
  7. Senegačnik, A., et al., Annular Shaft Kiln for Lime Burning with Kiln Gas Recirculation, Applied Thermal Engineering, 28 (2008), 7, pp. 785-792
  8. Gutierrez, A. S., Vandecasteele, C., Exergy-based Indicators to Evaluate the Possibilities to Reduce Fuel Consumption in Lime Production, Energy, 36 (2011), 5, pp. 2820-2827
  9. Gutierrez, A. S., et al., Energy and Exergy Assessment of a Lime Shaft Kiln, Applied Thermal Engineering, 51 (2013), 1-2, pp. 273-280
  10. Rong, W., et al., Energy and Exergy Analysis of an Annular Shaft Kiln with Opposite Burners, Applied Thermal Engineering, 119 (2017), June, pp. 629-638
  11. van Berkel, R., Comparative Evaluation of Cleaner Production Working Methods, Journal of Cleaner Production, 2 (1994), 3-4, pp. 139-152
  12. Bes, A., Dynamic Process Simulation of Limestone Calcination in Normal Shaft Kilns, Ph. D. thesis, University in Magdeburg, Magdeburg, Germany, 2005
  13. ***, Environmental Impact Assessment - Windalco New Lime Kiln - Shooters Hill, Manchester, Prep. for WIA Company, Kirkvine Works, Manchester, Conrad Douglas & Associates Ltd., 2007
  14. Piringer, H., Lime Shaft Kilns, Energy Procedia, 120 (2017), Aug., pp. 75-95
  15. Krause, B., et al., 3D-DEM-CFD Simulation of Heat and Mass Transfer, Gas Combustion and Calcination in an Intermittent Operating Lime Shaft Kiln, International Journal of Thermal Sciences, 117 (2017), July, pp. 121-135
  16. ***, IPPC Draft Reference Document on Best Available Techniques in the Cement, Lime and Magnesium Oxide Manufacturing Industries, EC, Directorate General JRC, Sevilla, Spain, 2009
  17. ***, Energy Efficiency Opportunity Guide in the Lime Industry, Canadian Lime Institute, 2001
  18. ***, geology.com/rocks/dolomite.shtml
  19. Piringer, H., Process Optimization on Maerz Lime Kilns, ZKG International, 58 (2005), 1, pp. 41-48
  20. ***, The MAERZ Parallel Flow Regenerative Lime Kiln, Maerz Ofenbau AG, Zurich, Switzerland
  21. Petrovski, I. J., et al., Energy Efficiency Improvement Opportunities in Vardar Dolomite ‒ Gostivar, Programme "Cleaner and More Effective Industry in Macedonia", Norsk Energi and Centre for Climate Change, 2011-12
  22. Filkoski, R. V., et al., Optimisation of Combustion and Technology Process in a Vertical Shaft Kiln, Proceedings, 12th International Conference SDEWES 2017, Dubrovnik, Croatia, 2017
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Energy optimisation of vertical shaft kiln operation in the process of dolomite calcination

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