Abstract
The present work proposes a novel industrial multi-field synergistic dryer with a drying capacity of 3.45 t/h. The energy, exergy, and quality aspects of the drying process were studied. An energy–exergy methodology was employed to estimate the energetic and exergetic performance, heat loss characteristics and heat recovery behavior of the dryer. Additionally, the quality of the dried paddy seeds was evaluated by its crackle ratio, generation potential, and generation rate. The results showed that the overall energy and exergy efficiency ranged from 13.26% to 56.63% and 39.03% to 60.23%, respectively. The improvement potential rates of the whole system varied from the lowest 8.49 kW to the highest 15.83 kW and respectively accounted for 15.81%–29.48% of the total exergy input, indicating that the performance of the dryer is acceptable. The total recovered radiant energy and radiant exergy recover rate were respectively ascertained to be 237.64 MJ and 0.26 kW. As for the quality aspect, the generation potential and generation rate of the dried paddy seeds respectively ranged from 75% to 90% and 69% to 88% while the crackle ratio of the paddy seeds was 1%, which indicated that the quality performance of the dried seed is of economic viability.
Highlights
Drying is a typical irreversible thermodynamic process which is affected by external constraints, and by the inherent properties of materials, the thermodynamic mechanism of the drying process, and the dynamic irreversible characteristics of the interactions [1]
The drying performance of the dryer was evaluated by the drying kinetics, crackle ratio and generation ratio of the dried product, the results are shown in Figures 4–6, respectively
The average drying rate for the paddy drying in the present dryer was ascertained to be
Summary
Drying ( dehydration or dewatering) is a typical irreversible thermodynamic process which is affected by external constraints (e.g., the drying process and ambient conditions), and by the inherent properties of materials, the thermodynamic mechanism of the drying process, and the dynamic irreversible characteristics of the interactions [1]. As a high-energy consumption operation in industrial production, drying consumes about. It is of great significance to explore the drying theory and energy-saving technologies for the drying industry. Paddy drying is a highly energy-intensive operation and sensitive to the quality of the dried product. In the last few decades, many researchers have carried out a great deal of research on the energy consumption and the quality investigation of paddy drying [5,6,7,8,9,10,11], seldom studies about industrial-scale paddy drying technologies have been reported. Sarker et al, reported an industrial fluidized bed dryer in 2015 [12] and found that the energy efficiency of the drying process ranged from
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