State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
Bioresour Technol. 2018 Dec;270:352-358. doi: 10.1016/j.biortech.2018.09.067. Epub 2018 Sep 15.
A novel volute aerator was proposed to generate shear force and break gas flow through water centrifugation to promote mass transfer for CO fixation with microalgae. The bubble evolution and gas-liquid mixing processes in volute aerator were numerically simulated. The bubble generation time and diameter were measured on a high-speed camera and assessed with level-set method. By optimizing gas inletpipe angle and water/gas inlet velocities of volute aerator, the bubble generation time decreased by 60.1% to 3.3 ms and outlet bubble diameter decreased by 50.7% to 1.8 mm, compared with traditional strip aerator. The corresponding gas-liquid mixing time reduced by 15.6% and mass transfer coefficient increased by 42.2%. The volute aerator was used as an alternative to traditional strip aerator to culture microalgae under high-purity CO condition, which promoted average growth rate and biomass production by 26.6% and 50.7%, respectively.
一种新型的螺旋式空气搅拌器被提出，通过水离心来产生剪切力和打破气流，以促进二氧化碳与微藻的固定的传质。对螺旋式空气搅拌器中的气泡演化和气液混合过程进行了数值模拟。使用高速摄像机测量了气泡生成时间和直径，并采用水平集方法进行了评估。通过优化螺旋式空气搅拌器的进气管角度和水气进口速度，与传统的条带式空气搅拌器相比，气泡生成时间减少了 60.1%，至 3.3ms，出口气泡直径减少了 50.7%，至 1.8mm。相应的气液混合时间减少了 15.6%，传质系数增加了 42.2%。在高纯度 CO 条件下，螺旋式空气搅拌器被用作传统条带式空气搅拌器的替代品来培养微藻，分别促进了平均增长率和生物量生产增加了 26.6%和 50.7%。
