Conventional and Advanced Exergy and Exergoeconomic Analysis of a Spray Drying System: A Case Study of an Instant Coffee Factory in Ecuador

Diana L. Tinoco-Caicedo, Alexis Lozano-Medina and Ana M. Blanco-Marigorta
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Diana L. Tinoco-Caicedo: Facultad de Ciencias Naturales y Matemáticas, Escuela Superior Politécnica del Litoral, 090903 Guayaquil, Ecuador
Alexis Lozano-Medina: Department of Process Engineering, Universidad de las Palmas de Gran Canaria, 35017 Las Palmas de Gran Canaria, Spain
Ana M. Blanco-Marigorta: Department of Process Engineering, Universidad de las Palmas de Gran Canaria, 35017 Las Palmas de Gran Canaria, Spain

Energies, 2020, vol. 13, issue 21, 1-19

Abstract: Instant coffee is produced worldwide by spray drying coffee extract on an industrial scale. This production process is energy intensive, 70% of the operational costs are due to energy requirements. This study aims to identify the potential for energy and cost improvements by performing a conventional and advanced exergy and exergoeconomic analysis to an industrial-scale spray drying process for the production of instant coffee, using actual operational data. The study analyzed the steam generation unit, the air and coffee extract preheater, the drying section, and the final post treatment process. The performance parameters such as exergetic efficiency, exergoeconomic factor, and avoidable investment cost rate for each individual component were determined. The overall energy and exergy efficiencies of the spray drying system are 67.6% and 30.6%, respectively. The highest rate of exergy destruction is located in the boiler, which amounts to 543 kW. However, the advanced exergoeconomic analysis shows that the highest exergy destruction cost rates are located in the spray dryer and the air heat exchanger (106.9 $/h and 60.5 $/h, respectively), of which 47.7% and 3.8%, respectively, are avoidable. Accordingly, any process improvement should focus on the exergoeconomic optimization of the spray dryer.

Keywords: advanced exergoeconomic analysis; spray dryer; exergy destruction cost rate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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