Zeng Zhiheng, Li Bin, Han Chongyang, Wu Weibin, Chen Tianci, Dong Chengju, Gao Changlun, He Zhaokai, Zhang Fangren
College of Engineering, South China Agricultural University, Guangzhou 510642, China.
School of Intelligent Manufacturing Engineering, Chongqing University of Arts and Sciences, Chongqing 404100, China.
Foods. 2022 Oct 20;11(20):3281. doi: 10.3390/foods11203281.
The purpose of this research work is to perform detailed exergetic, energetic and techno-economic analysis of the black tea drying process in the gas-type industrial dryer. Exergy-energy and techno-economic methodology was applied to investigate the heat loss, exergetic and energetic performance, exergy efficiency, improvement potential rate, sustainability index and techno-economic performance of a drying system. The results showed that the heat loss of exhaust air in the late drying process played a main contributing role in the heat loss and exergy loss of the whole drying system. Therefore, the exergy efficiency of the initial drying period and the redrying period varied from 38.08% to 65.09% and 24.76% to 26.97%, respectively. In addition, the improvement potential rate and sustainability index of the whole system varied from 6.93 kW to 12.94 kW and 1.33 to 2.86, respectively. The improvement potential obtained in the present work indicated that the drying operation is greatly in need of exergy performance improvement. Finally, the net present value and payback period obtained from techno-economic analysis were 179,442.03 USD and 5.3 years, the result is useful for investors or contractors to refer to and make investment decisions.
本研究工作的目的是对燃气型工业干燥机中的红茶干燥过程进行详细的火用分析、能量分析和技术经济分析。应用火用-能量和技术经济方法来研究干燥系统的热损失、火用性能和能量性能、火用效率、改进潜力率、可持续性指数以及技术经济性能。结果表明，干燥后期的废气热损失在整个干燥系统的热损失和火用损失中起主要作用。因此，初始干燥期和再干燥期的火用效率分别在38.08%至65.09%和24.76%至26.97%之间变化。此外，整个系统的改进潜力率和可持续性指数分别在6.93千瓦至12.94千瓦和1.33至2.86之间变化。本研究获得的改进潜力表明，干燥操作非常需要提高火用性能。最后，技术经济分析得出的净现值和投资回收期分别为179,442.03美元和5.3年，该结果有助于投资者或承包商参考并做出投资决策。
