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Technical and economic analysis of an advanced multi-stage flash crystallizer for the treatment of concentrated brine
Desalination ( IF 9.9 ) Pub Date : 2021-01-22 , DOI: 10.1016/j.desal.2020.114925
David von Eiff , Pak Wai Wong , Yonggang Gao , Sanghyun Jeong , Alicia Kyoungjin An

In this study, we present an advanced multi-stage flash crystallizer and analyze its potential for the treatment of concentrated brine. The proposed system was evaluated with raw seawater at the lab scale and through ASPEN Plus simulation of reverse osmosis (RO) and membrane distillation (MD) condensates at a larger scale. Lab scale XRD result revealed the proposed crystallizer can separate Na2SO4 crystals from solution. A variety of configurations were then simulated, including number of stages, flow rates, and temperatures, to determine impacts on the recovery rate of distillate and salts. Based on the simulation data, the gained output ratio increased with the number of stages from 2.77 to 4.0, stabilizing at a flow rate of 700 L/h at 70 °C for 40 stages. A recovery rate of 4% for water and 25.05 kg/h for Glauber's Salt (Na2SO4·10H2O) was observed. Based on the technoeconomic analysis, the optimal configuration was a 7-stage module operated at 60 °C and a flow rate of 700 L/h. Treatment cost were $1.17 per m3 of feed, which reduced to $0.35 per m3 when the sale of beneficial resources was considered. When the MD pretreatment was considered, the total combined treatment costs were $2.01 per m3, without the sale of beneficial resources, which was highly competitive with other treatment methods.



中文翻译:

先进的多级闪蒸结晶器处理浓盐水的技术和经济分析

在这项研究中,我们提出了一种先进的多级闪蒸结晶器,并分析了其在浓盐水处理中的潜力。拟议的系统在实验室规模下用原始海水进行了评估,并通过ASPEN Plus模拟了反渗透(RO)和膜蒸馏(MD)更大范围内的冷凝物。实验室规模的XRD结果表明拟议的结晶器可以分离Na 2 SO 4溶液中的晶体。然后模拟了多种配置,包括阶段数,流速和温度,以确定对馏出物和盐的回收率的影响。根据仿真数据,获得的输出比率随着级数从2.77增加到4.0,在70°C下以700 L / h的流量稳定了40级。观察到水的回收率为4%,格劳伯盐(Na 2 SO 4 ·10H 2 O)的回收率为25.05 kg / h 。根据技术经济分析,最佳配置是在60°C和700 L / h的流量下运行的7级模块。治疗成本是$ 1.17每m 3进料的,这减少至$ 0.35每m 3当考虑出售有益资源时。当考虑进行MD预处理时,总的组合处理成本为每m 3 $ 2.01 ,而没有出售有益的资源,这与其他处理方法极具竞争力。

更新日期:2021-01-22
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