A case study on energy and exergy analyses for an industrial-scale vertical roller mill assisted grinding in cement plant |
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Authors: | Vahab Ghalandari Mohamadreza Esmaeilpour Naser Payvar M Toufiq Reza |
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Affiliation: | 1. Kerman Momtazan Cement Company, 32nd km Kerman-Tehran Highway, Kerman, Iran;2. Department of Chemical Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran;3. Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, Melbourne, FL, USA |
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Abstract: | In this study, the analyses of energy and exergy were implemented for an industrial-scale vertical roller mill (VRM) of Kerman Momtazan Cement Company (KMCC) of Iran. The energy and exergy analyses demonstrated the first law efficiency of the VRM is 62.1%, while the second law efficiency of the VRM is 34.6%. Comparing to the widely applied ball milling, the second law efficiency is 16.4% higher for the VRM than the ball mill. Results also showed when the classifier rotor speed increases from 53 to 65 rpm, the particle size of the product decreases from P90µm = 18.2% to P90µm = 10.8%, but the power consumption of the VRM unit increases from 19.7 to 22.3 kWh/t of raw materials. Finally, the power consumption of the VRM unit compared with 14 raw mill units around Iran and the international best available technology (IBAT). The results demonstrated that the VRM unit consumes around 81% (9.75 kWh/t of raw materials), and 36% (5.8 kWh/t of raw materials) more energy to grind raw material than the IBAT unit and domestic best raw mill (DBRM), respectively. |
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Keywords: | Vertical roller mill Cement plant Energy analysis Exergy analysis Grinding process Thermodynamic assessment |
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