Zeng Zhiheng, Li Bin, Han Chongyang, Wu Weibin, Wang Xiaoming, Xu Jian, Zheng Zefeng, Ma Baoqi, Hu Zhibiao
College of Engineering, South China Agricultural University, Guangzhou 510642, China.
School of Intelligent Manufacturing Engineering, Chongqing University of Arts and Sciences, Chongqing 404100, China.
Entropy (Basel). 2022 May 6;24(5):655. doi: 10.3390/e24050655.
The performance evaluation and optimization of an energy conversion system design of an energy intensive drying system applied the method of combining exergy and economy is a theme of global concern. In this study, a gas-type industrial drying system of black tea with a capacity of 100 kg/h is used to investigate the exergetic and economic performance through the exergy and exergoeconomic methodology. The result shows that the drying rate of tea varies from the maximum value of 3.48 g/g h to the minimum 0.18 g/g h. The highest exergy destruction rate is found for the drying chamber (74.92 kW), followed by the combustion chamber (20.42 kW) in the initial drying system, and 51.83 kW and 21.15 kW in the redrying system. Similarly, the highest cost of the exergy destruction rate is found for the drying chamber (18.497 USD/h), followed by the combustion chamber (5.041 USD/h) in the initial drying system, and 12.796 USD/h and 5.222 USD/h in the redrying system. Furthermore, we analyzed the unit exergy rate consumed and the unit exergy cost of water removal in different drying sections of the drying system, and determined the optimal ordering of each component. These results mentioned above indicate that, whether from an energy or economic perspective, the component improvements should prioritize the drying chamber. Accordingly, minimizing exergy destruction and the cost of the exergy destruction rate can be considered as a strategy for improving the performance of energy and economy. Overall, the main results provide a more intuitive judgment for system improvement and optimization, and the exergy and exergoeconomic methodology can be commended as a method for agricultural product industrial drying from the perspective of exergoeconomics.
应用火用与经济性相结合的方法对能源密集型干燥系统的能量转换系统设计进行性能评估和优化是全球关注的一个主题。在本研究中，采用了一个容量为100 kg/h的红茶燃气型工业干燥系统，通过火用和火用经济方法来研究其火用和经济性能。结果表明，茶叶的干燥速率从最大值3.48 g/g h变化到最小值0.18 g/g h。在初始干燥系统中，干燥室的火用破坏率最高（74.92 kW），其次是燃烧室（20.42 kW），再干燥系统中的火用破坏率分别为51.83 kW和21.15 kW。同样，在初始干燥系统中，干燥室的火用破坏率成本最高（18.497美元/h），其次是燃烧室（5.041美元/h），再干燥系统中的火用破坏率成本分别为12.796美元/h和5.222美元/h。此外，我们分析了干燥系统不同干燥段的单位火用消耗率和单位脱水火用成本，并确定了各组件的最优排序。上述结果表明，无论是从能源还是经济角度来看，组件改进都应优先考虑干燥室。因此，将火用破坏和火用破坏率成本降至最低可被视为提高能源和经济性能的一种策略。总体而言，主要结果为系统改进和优化提供了更直观的判断，并且从火用经济学角度来看，火用和火用经济方法可被推荐为一种用于农产品工业干燥的方法。
