CAJ | 학술논문

为加深对循环流化床脱硫反应器的流动特性的认识，本研究采用双流体模型，耦合非均匀曳力模型和颗粒动力学理论，使用非均匀的修正的Syamlal O￠Brien曳力模型考虑颗粒团聚现象对气固流动的影响，对循环流化床脱硫反应器中的流体力学特性进行了数值模拟。模拟得到的时均颗粒浓度和压降值与实验数据具有较好的一致性，验证了模拟方法的可靠性。颗粒速度的时间序列和概率分布函数显示，在反应器壁面附近区域均存在颗粒的向上、向下运动，在床层内颗粒总体上向上运动，同时还存在微观的内循环运动。模拟结果为颗粒速度的径向非均一分布提供了合理的解释，较Gidaspow模型有更好的适用性。
위가심대순배류화상탈류반응기적류동특성적인식，본연구채용쌍류체모형，우합비균균예력모형화과립동역학이론，사용비균균적수정적Syamlal O￠Brien예력모형고필과립단취현상대기고류동적영향，대순배류화상탈류반응기중적류체역학특성진행료수치모의。모의득도적시균과립농도화압강치여실험수거구유교호적일치성，험증료모의방법적가고성。과립속도적시간서렬화개솔분포함수현시，재반응기벽면부근구역균존재과립적향상、향하운동，재상층내과립총체상향상운동，동시환존재미관적내순배운동。모의결과위과립속도적경향비균일분포제공료합리적해석，교Gidaspow모형유경호적괄용성。
The hydrodynamics of gas-solid flow in a circulating fluidized bed desulfurization reactor was simulated by using two-fluid model and granular kinetics theory. The gas-solid inter-phase drag force is simulated by the Syamlal O’Brien drag model considering the particles clusters. The simulated time-averaged particle concentration and pressure drop agreed well with experimental data, which verified the feasibility of the simulation method. The instantaneous particle velocities and their probability density functions showed that the particles moved upward and downward near the wall. In general most particles moved upward in the CFB, while the microcosmic internally circulating flow of particles existed simultaneously The instantaneous particle velocity profiles offered an interpretation for the non-uniform distribution of time-averaged particle velocity, which proved that the OS drag model was better than Gidaspow drag model in the simulation of CFB.