秸秆的天然结构是阻碍其被生物酶降解,实现生物质资源有效利用的主要障碍。通过超声波空化效应对秸秆进行预处理,可以破坏其结构,有效改善纤维素酶对其降解效果。本文研究了秸秆粒径、使用量、超声功率、超声处理时间对纤维素酶降解...秸秆的天然结构是阻碍其被生物酶降解,实现生物质资源有效利用的主要障碍。通过超声波空化效应对秸秆进行预处理,可以破坏其结构,有效改善纤维素酶对其降解效果。本文研究了秸秆粒径、使用量、超声功率、超声处理时间对纤维素酶降解秸秆的影响。结果表明:0.2 g 160-200目秸秆在100 W功率下超声处理15 min,酶降解效果达到最佳,比未处理组提高47.2%,并通过扫描电子显微镜对处理后秸秆形态进行了观察。展开更多
Ultrasonic vibrations in coal lead to cavitation bubble oscillation, growth, shrinkage, and collapse, and the strong vibration of cavitation bubbles not only makes coal pores break and cracks propagate, but plays an i...Ultrasonic vibrations in coal lead to cavitation bubble oscillation, growth, shrinkage, and collapse, and the strong vibration of cavitation bubbles not only makes coal pores break and cracks propagate, but plays an important role in enhancing the permeability of coal. In this paper, the influence of ultrasonic cavitation on coal and the effects of the sonic waves on crack generation, propagation, connection, as well as the effect of cracks on the coal permeability, are studied. The experimental results show that cracks in coal are generated even connected rapidly after ultrasonic cavitation. Under the effect of ultrasonic cavitation,the permeability increases between 30% and 60%, and the number of cracks in coal also significantly increased. Numerical experiments show that the effective sound pressure is beneficial to fracture propagation and connection, and it is closely related to the permeability. Moreover, the numerical simulations and physical experiments provide a guide for the coal permeability improvement.展开更多
文摘秸秆的天然结构是阻碍其被生物酶降解,实现生物质资源有效利用的主要障碍。通过超声波空化效应对秸秆进行预处理,可以破坏其结构,有效改善纤维素酶对其降解效果。本文研究了秸秆粒径、使用量、超声功率、超声处理时间对纤维素酶降解秸秆的影响。结果表明:0.2 g 160-200目秸秆在100 W功率下超声处理15 min,酶降解效果达到最佳,比未处理组提高47.2%,并通过扫描电子显微镜对处理后秸秆形态进行了观察。
基金supported by the National Natural Science Foundation of China (No. 51574114)the National Key Research and Development Program (No. 2016YFC0600901)
文摘Ultrasonic vibrations in coal lead to cavitation bubble oscillation, growth, shrinkage, and collapse, and the strong vibration of cavitation bubbles not only makes coal pores break and cracks propagate, but plays an important role in enhancing the permeability of coal. In this paper, the influence of ultrasonic cavitation on coal and the effects of the sonic waves on crack generation, propagation, connection, as well as the effect of cracks on the coal permeability, are studied. The experimental results show that cracks in coal are generated even connected rapidly after ultrasonic cavitation. Under the effect of ultrasonic cavitation,the permeability increases between 30% and 60%, and the number of cracks in coal also significantly increased. Numerical experiments show that the effective sound pressure is beneficial to fracture propagation and connection, and it is closely related to the permeability. Moreover, the numerical simulations and physical experiments provide a guide for the coal permeability improvement.