【摘要】 研究船舶废气脱硫塔内流场优化设计,为提高脱硫塔脱硫效率及降低塔内压损,利用子域技术建立脱硫塔体网格模型,使用有限差分法进行数值运算,并采用CFD软件对塔内流场进行数值仿真。基于RANS湍流模型模拟废气流速分布,得到仿真结果与实际较符合,证明模型可靠。提出了多流体模型与分散型k-ε湍流模型并用来模拟气液两相流,研究发现塔内存在"壁流"现象、气液接触不均匀等问题。通过改变废气入口位置及喷嘴支撑臂长,对塔内流场进行优化设计,结果表明,废气沿切线方向进入利于流场均匀分布,延长喷嘴支撑臂长可降低塔内压损,为废气脱硫塔内流场优化设计提供了依据。更多还原

【Abstract】 The design of flow field in ship exhaust gas desulfurization tower is studied to improve the desulfurization efficiency and reduce pressure loss.Tower grid model is set up by using sub-grid technique,and then the numerical simulation of the flow field is carried out with finite-difference method and the CFD software.Based on RANS turbulence model,the exhaust gas velocity distribution is simulated,and the results prove that the model is reliable.Multi-fluid model and distributed k-e turbulence model are used to simulate gas liquid two phase flow,it is shown that there is the phenomenon of " wall-flow" and gas-liquid contact unevenly.Through changing gas inlet position and nozzle support arm length,the influence on the flow field is explored,which discovers that the gas inlet via the tangent direction is beneficial to uniform flow field distribution,and the pressure loss gets lower as nozzle support arm extended in the tower.更多还原