钙化渣碳化反应器的数值模拟

针对低品位铝土矿在工业中利用率不高、赤泥中高碱高铝等问题，提出了钙化-碳化法处理低品位铝土矿和赤泥的新方法.设计了文丘里式钙化渣碳化反应器，利用商用CFD软件ANSYS130/Fluent对该反应器中气液固三相流动进行了模拟计算.模拟和研究了表观气速等结构参数对钙化渣碳化反应器内速度场、气含率的影响，发现增大表观气速有利于促进气液间传质和反应，但气含率不宜过大.平均气含率的模拟值与实测值吻合良好，验证了所提方法的有效性.研究结果对钙化渣碳化反应器的设计及应用具有一定的参考价值.

Numerical Simulation of Carbonation Reactor for Calcified Residues

Aiming at the problem of the low utilization of low grade bauxite in industry and that of the high alkali and high aluminum contents in red mud， a new method of calcification carbonation was proposed to process low grade bauxite and red mud. A venturi carbonation reactor for calcified residues was designed， and the dynamic characteristics of gas liquid solid three phase flow in the reactor were simulated by using ANSYS130/Fluent. The effect of operation parameters such as superficial gas velocity on velocity field and gas holdup in the reactor was simulated and investigated. It shows that high gas velocity benefits gas liquid mass transfer and reaction， but the gas holdup should not be too large. The simulation results of average gas holdup agree well with the measured ones， thus the effectiveness of the method is verified. The results have a certain reference value for the design and application of venturi carbonation reactor.