摘要
应用气固两相双流体模型结合颗粒动力学理论,对内置分离器循环流化床脱硫塔内气固两相流中的气相湍流流动和颗粒相脉动流动进行了数值模拟。模拟得到脱硫塔内颗粒相、气相速度和浓度径向分布。利用FFT方法分析了颗粒质量流率振幅图,结果表明,利用数值模拟方法能够很好地预测不同内部构件条件下塔内分离效率。内置分离器有利于强化内部循环,减轻外部除尘设备负荷。气力输送条件下,脱硫塔内呈环核流动,有利于防止壁面结垢和提高脱硫塔的运行稳定性。模拟得到的结果与实验值基本吻合,为化学反应模拟奠定了基础。
A numerical simulation was conducted of the gas-phase turbulent flow and particle-phase pulsating flow within the gas-solid two-phase flow in the circulating fluidized bed desulfurizer of a built-in separator by using a gas-solid two-phase dual-fluid model in conjunction with particle dynamics theory.Through the simulation,the particle-and gas phase velocity as well as the concentration radial distribution inside the desulfurizer has been obtained.By employing a FFT(Fast Fourier Transform) method,the amplitude chart of particle mass-flow rate was analyzed.The results show that by using the numerical simulation method one can accurately forecast the separation efficiency of the desulfurizer under the condition of different internal components.The function of the built-in separator is conducive to intensifying internal circulation and reducing the load of external dust-removal equipment.Under the condition of pneumatic transport,the flow within the desulfurizer assumes a core annular structure,which is favorable for preventing fouling on wall surfaces and enhancing the operating stability of the desulfurizer.The simulation results are basically in agreement with the experimental ones,thus laying a solid basis for the simulation of chemical reactions.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2006年第5期487-490,共4页
Journal of Engineering for Thermal Energy and Power
基金
国家重点科技攻关课题基金资助项目(2004BA401A12-5)
