Energy efficiency evaluation and economic analyses of direct contact membrane distillation system using Aspen Plus
Energy efficiency evaluation and economic analyses of direct contact membrane distillation system using Aspen Plus
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DOI：
10.1016/j.desal.2011.04.048
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发表时间：
2011-12-01
期刊：
影响因子：
9.9
通讯作者：
Fane, Anthony G.
中科院分区：
文献类型：
--
作者：
Zuo, Guangzhi;Wang, Rong;Fane, Anthony G.
采用白杨Plus软件对直接接触式膜蒸馏系统进行了模拟计算，并对系统进行了能效和经济性分析。首先对错流膜组件进行建模，然后将其并入流程图进行系统模拟。模拟结果表明，在所研究的DCMD系统中，存在一个临界膜面积，在该临界膜面积以下，产水量和产水率随膜面积的增大而增大，产水率随膜面积的增大而增大。导致WPC显著下降。提高进料温度对水通量和CUR产生积极影响。对于较高的进料和渗透速度，水通量，产水量和CUR增加。然而，对于WPC，存在最佳流体速度，超过该最佳流体速度，以用于泵送的电力消耗的形式的更多能量输入的惩罚是显著的。还发现，当热交换器中的温差增加到6摄氏度时，通过降低热交换器成本，可以显著地减少WPC。(C)2011 Elsevier B.V.保留所有权利。
A direct contact membrane distillation system (DCMD) was simulated by using Aspen Plus for the purpose of energy efficiency and economic analyses. A cross-flow membrane module was firstly modeled and then incorporated into the flowsheet for system simulation. Detailed investigations have been conducted to understand the relationships of the water flux/production, the gain output ratio (CUR) and the water production cost (WPC) with respect to various design and operation parameters of the DCMD system.Simulation results revealed that in the DCMD studied here, a critical membrane area existed, below which, significant increases of water production and the CUR were observed with increasing membrane area, leading to a significant drop in the WPC. Increasing feed temperature imposes positive impacts on water flux and the CUR. For the higher feed and permeate velocities, there were increases in water flux, water production and the CUR. However for the WPC there were optimum fluid velocities beyond which the penalty of more energy input in the form of electricity consumption for pumping was significant. It was also found that when the temperature difference in the heat exchanger was increased to 6 degrees C. the WPC can be reduced considerably by cutting down the heat exchanger cost. (C) 2011 Elsevier B.V. All rights reserved.