操作变量对大型浆态床反应器流体力学特性的影响

研究了系统压力、表观气速和固体颗粒体积分数对浆态床反应器气含率、气泡直径及气液接触面积的影响 ,通过试验得出了气含率和操作变量之间的统计关联式 ,给出了在湍流条件下浆态床反应器中气含率和气体动量之间的关系

EFFECT OF OPERATING VARIABLES ON HYDRODYNAMICS IN LARGE SCALE SLURRY BUBBLE COLUMN REACTOR

The effects of pressure ( p ), superficial gas velocity ( U _G) and solid concentration ( c _v) on gas bubble size, gas holdup( ε _G)and gas liquid interfacial area ( a ) in a large scale slurry bubble column reactor were investigated. The gas-liquid-solid three phases were methane, mixture of decanes and glass beads with 15-20 μm diameter respectively in this study. The experiments were selected on the basis of three main process variables ( p,U _G and c _v) at five levels and a statistical correlation ε _G to the three main process variables was proposed from the data obtained. Further, the relationship between gas holdup and gas momentum per unit mass slurry was determined and could be expressed as ε _G=3 M ^1/3 _Gexp(-1.5 c _v). Gas holdup values were measured by using the manometric method and were found to increase with pressure and superficial gas velocity due to the increase of the number of the small and large gas bubbles, respectively, it decreased with increasing solid concentration due to the decrease of the number of the small gas bubbles. Consequently,the interfacial area was found to increase with superficial gas velocity and pressure, and decrease with solid concentration.