循环流化床脱硫反应器入口结构对气体流动影响数值模拟

用k ε双方程湍流模型对下部装有文丘里进气分布器的新型循环流化床脱硫反应器的流场进行了模拟,并与实验值进行比较,模拟计算值与实验值吻合良好,验证了k ε方程的适用性。计算结果表明:由于文丘里管特殊结构的影响,流化床提升管内气体流场、文丘里扩散段的流动特性呈现出复杂的流动状态。运用速度分布不均匀度概念,浅析了文丘里扩散段及提升管中气体流动,为进一步优化循环流化床脱硫反应器入口结构打下基础。

Effect of the venturi inlet configuration on gas flow in circulating fluidized bed desulfurization reactor-numerical simulation

Numerical simulation of gas flow field generated by the circulating fluidized bed desulfurization reactor, which was equipped with venturi gas distributor in the bottom, was performed using the two-equation k-ε turbulent model. The comparison between the numerical results and the experimental data presented a better agreement and validated the two-equation k-ε model. The numerical results show that the gas flow field in the riser of fluidized bed and the flow character in the venturi diffuser are complicated due to the specific venturi configuration. Furthermore, the gas flow in the venturi diffuser and the riser was analyzed with the conception of the velocity non-uniformity, which provided a good platform for the further improvement of the inlet configuration of the circulating fluidized bed desulfurization reactor.