Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Primary energy and exergy analysis of a spray dryer for the application of industrial effluents: a case study

Primary energy and exergy analysis of a spray dryer for the application of industrial effluents:... This study presents a mathematical model based on the mass, energy, and exergy balance of the spray dryer with a direct and hybrid heat recovery system. The spray drying system is an energy-intensive process; thus, an insight of exergy analysis helps improve overall system performance by reducing the irreversibilities in the spray drying system. An industrial case study illustrates the proposed exergy-based model. Besides, the exergetic parametric analysis is carried out by varying the slurry feed flow rate, the temperature of hot gases, solid content in the feed, and dead state temperature to determine the best operating conditions at minimum irreversibility in the drying system. The highest exergy efficiency of the spray dryer with a hybrid heat recovery system is 49.9% at 10 °C dead state temperature. In comparison, the direct heat recovery system has the lowest one (19.17%) at the drying air temperature of 500 °C. The exergy input is directly proportional to the mass flow rate of hot air/gases, thus, observed to be lower at a 70% recirculation ratio of exhaust air/gases. The improvement potential for direct and hybrid heat recovery systems is obtained in the range of 580–666 kJ/s and 740–700 kJ/s, respectively, showing the drying process has vast potential for improving the exergetic performance. Moreover, the hybrid energy recovery system is found to be more sustainable. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Brazilian Journal of Chemical Engineering Springer Journals

Primary energy and exergy analysis of a spray dryer for the application of industrial effluents: a case study

Loading next page...
 
/lp/springer-journals/primary-energy-and-exergy-analysis-of-a-spray-dryer-for-the-Vp0nh8t7ay
Publisher
Springer Journals
Copyright
Copyright © Associação Brasileira de Engenharia Química 2021
ISSN
0104-6632
eISSN
1678-4383
DOI
10.1007/s43153-021-00197-0
Publisher site
See Article on Publisher Site

Abstract

This study presents a mathematical model based on the mass, energy, and exergy balance of the spray dryer with a direct and hybrid heat recovery system. The spray drying system is an energy-intensive process; thus, an insight of exergy analysis helps improve overall system performance by reducing the irreversibilities in the spray drying system. An industrial case study illustrates the proposed exergy-based model. Besides, the exergetic parametric analysis is carried out by varying the slurry feed flow rate, the temperature of hot gases, solid content in the feed, and dead state temperature to determine the best operating conditions at minimum irreversibility in the drying system. The highest exergy efficiency of the spray dryer with a hybrid heat recovery system is 49.9% at 10 °C dead state temperature. In comparison, the direct heat recovery system has the lowest one (19.17%) at the drying air temperature of 500 °C. The exergy input is directly proportional to the mass flow rate of hot air/gases, thus, observed to be lower at a 70% recirculation ratio of exhaust air/gases. The improvement potential for direct and hybrid heat recovery systems is obtained in the range of 580–666 kJ/s and 740–700 kJ/s, respectively, showing the drying process has vast potential for improving the exergetic performance. Moreover, the hybrid energy recovery system is found to be more sustainable.

Journal

Brazilian Journal of Chemical EngineeringSpringer Journals

Published: Mar 1, 2022

Keywords: Spray dryer; Primary energy; Exergy efficiency; Sustainability; Improvement potential; Hybrid heat recovery system

References