振荡流态化现象及应用

Oscillating Fluidization and Its Application

研究了轻颗粒振荡流态化现象,通过对颗粒在振荡体中运动方程的求解,得到了单颗粒运动模型及重颗粒克服重力漂浮或者轻颗粒逆浮力下沉的临界参数关系式.用五种粒径、三种不同密度的轻颗粒实验数据及梁百申、邓勇有关重颗粒的数据验证了模型,结果表明实验值与理论值吻合较好.同时,从理论上得到流体在振荡情况下颗粒床层松散的数学表达式,并以实验进行了验证.振荡流态化反应器用于固定化细胞发酵酒精,可解决发酵过程产生的CO_2气体附着在酵母载体表面导致发酵过程操作条件恶化的问题,提高了操作稳定性和发酵反应速度.

Some phenomena of the oscillating fluidization of light particles (ρp>ρf) were studied. By solving the equation of the motion of a single particle in a sinusoidally oscillating fluid, we obtained a model describing the particle motion and a correlation involving some critical parameters of a heavy particle (ρp>ρf) going up against the gravity or of a light particle (ρp<ρf) going down against the buoyancy. Those models were verified by experiments with light particles of five particle sizes and three particle density and by the data of Liang and Deng's experiment with heavy particles. Then, we proposed a mathematical model of solids bed being loosened sinusoidally oscillating fluid, which was examined with an oscillating fluidized-bed reactor. Lastly, a novel bioreactor, oscillating fluidized-bed of immobilized yeast cell beads, was developed for producing alcohol, and showed very good performance. The carbon dioxide adhered to the surface of the beads was separated easily from the surface and released from the reactor as very small bubbles.