纱筒残余氨的扩散过程建模与数值模拟  

Modeling and numerical simulation for residual ammonia volatilization from yarn bobbin

作　　者：张东 孟婥[1] 

机构地区：[1]东华大学机械工程学院,上海201620

出　　处：《纺织学报》2017年第9期149-154,共6页Journal of Textile Research

基　　金：长江学者与创新团队发展计划滚动支持项目(IRT_16R12);东华大学博士创新基金项目(16D310303)

摘　　要：为准确把握液氨整理后纱筒中残余氨的传质特性,提高氨的回收率与回收速率,首先建立了经综合考虑扩散传质和对流传质机制的传质数学模型,对柱坐标系下的传质方程进行归一化处理,将其转换成易于分析的一维平板类传质方程。然后利用Crank-Nicolson隐式差分法对归一化的传质方程进行差分近似求解,证明了算法的稳定性与收敛性。最后将数值计算结果与实验数据对比,验证模型的正确性。结果表明,提高风速以及减小纱筒外径都可加快氨的挥发,小风速下氨挥发过程是一个近似稳态过程。In order to accurately grasp the mass transfer characteristics of residual ammonia in yarn bobbins after liquid ammonia treatment and increase the recovery ratio and recovery rate of ammonia,a mathematical model of mass transfer was established by considering diffusion and convection. It became easier to analyze the mechanism of the emission of ammonia when the mass transfer equations was normalized. Then the Crank-Nicolson implicit difference method was used to solve the normalized mass transfer equations,and the stability and convergence of the algorithm were proved. Finally,the numerical results were compared with the experimental data,which proved the correctness of the model. The conclusion shows that the method of increasing wind velocity and decreasing the bobbin outer diameter can accelerate the volatilization of ammonia,and the ammonia volatilization process under low wind speed condition is an approximate steady state process.

关 键 词：纱筒 残余氨回收 液氨整理 传质数学模型 数值模拟 

分 类 号：TS19[轻工技术与工程—纺织化学与染整工程]