Simulation and multi-objective optimization of heat and mass transfer in direct contact membrane distillation by response surface methodology integrated modeling
Simulation and multi-objective optimization of heat and mass transfer in direct contact membrane distillation by response surface methodology integrated modeling
复制标题
响应面法集成建模直接接触膜蒸馏传热传质模拟及多目标优化
DOI：
10.1016/j.cherd.2020.05.018
复制
发表时间：
2020-07-01
影响因子：
3.9
通讯作者：
Xie, Zongli
中科院分区：
文献类型：
--
作者：
Cheng, Dongjian;Li, Na;Xie, Zongli
膜蒸馏（MD）传统上利用低品位热能驱动蒸汽通过疏水膜孔传输用于水处理。同时提高水通量、热效率和水生产率以实现MD的全局优化仍然是一个挑战。本文将传热传质理论模型与响应面法相结合，提出了一种新的模拟和优化方法，研究了各种影响因素对传热传质参数的复杂交互作用，包括总传质系数、进料/渗透侧传热系数、膜表面温度和温度极化系数，直接接触膜蒸馏（DCMD）。操作变量和组件结构变量对强化膜组件传热传质具有重要的交互作用。由于高进料温度、短组件长度和高进料速度的组合，显著提高的传热系数导致水通量和热效率的大幅度提高。最终确定了高水分生产率的全局最优条件，其中传热系数（5905 W/（m2·K））、温度极化系数（0.66）、水通量（63.0 kg/（m2·h））和热效率（0.83）都同步接近各自的峰值。结果表明，利用工况与组件结构参数的交互作用，是实现MD性能全面提升的有效途径。Crown版权所有（C）2020由Elsevier B. V.代表化学工程师学会发布。All rights reserved.
Membrane distillation (MD) traditionally utilizes low-grade thermal energy to drive vapor transport through hydrophobic membrane pores for water treatment. The concurrent enhancement of water flux, thermal efficiency and water productivity to achieve the global optimization of MD is still a challenge. In this work, a new simulation and optimization approach is proposed by integrating theoretical heat and mass transfer models with response surface methodology to investigate the complicate interaction effects of various influencing factors on heat and mass transfer parameters, including overall mass transfer coefficient, feed/permeate side heat transfer coefficients, membrane surface temperature and temperature polarization coefficient, in direct contact membrane distillation (DCMD). The operating and module configuration variables show important interaction effects on enhancing the heat and mass transfer in the membrane module. The significantly elevated heat transfer coefficient on account of the combined high feed temperature, short module length and high feed velocity leads to a great improvement of water flux and thermal efficiency. The ultimate global optimum conditions for the high water productivity were determined where the high levels of heat transfer coefficient (5905 W/(m(2).K)), temperature polarization coefficient (0.66), water flux (63.0 kg/(m(2).h)) and thermal efficiency (0.83) all synchronously approach to their own pinnacles. The results indicate that it is an effective way to take advantages of the interaction effects of operating conditions with module configuration parameters to achieve the overall enhancement of MD performance. Crown Copyright (C) 2020 Published by Elsevier B.V. on behalf of Institution of Chemical Engineers. All rights reserved.