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A lab-scale MED dealing with salinity wastewater: the study of optimal operation schemes and parameters

机译：实验室规模的含盐废水处理MED：最佳操作方案和参数的研究

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摘要

Multi-effect distillation (MED) system with a top brine temperature lower than 70 degrees C, is one of the most successful desalination technologies. In this paper, a lab-scale vertical tube MED system was performed for salinity wastewater desalination of petrochemical enterprises, and five salinity wastewater treatment schemes including different combinations of evaporator types were investigated. As a result, the falling-falling-climbing (FFC) system was considered as the optimal scheme. Then, the operation parameters including the feedwater salinity, temperature, flow rate, and the fresh steam flow rate were further optimized. The results indicated that the CR and gained output ratio (GOR) would rise up by increasing effect numbers, fresh steam flow rate, and feedwater temperature. While CR and GOR would fall down with the increase of the feedwater salinity and flow rate. Therefore, the optimal operation parameters were experimentally determined as follows: the feedwater with salinity of 0.6%, flow rate of 75kg/h, and temperature of 45 degrees C, and fresh steam flow rate of 17m(3)/h. The maximum CR and GOR were up to 5.08 and 4.13, respectively.
机译：最高盐水温度低于70摄氏度的多效蒸馏（MED）系统是最成功的脱盐技术之一。本文针对石化企业的含盐废水进行了实验室规模的垂直管MED系统脱盐处理，研究了五种含盐量不同的蒸发器组合方案。结果，下降-下降-爬升（FFC）系统被认为是最佳方案。然后，进一步优化了包括给水盐度，温度，流量和新鲜蒸汽流量在内的运行参数。结果表明，CR和获得的输出比（GOR）将通过增加效果数，新鲜蒸汽流量和给水温度而增加。而CR和GOR将随着给水盐度和流速的增加而下降。因此，实验确定了最佳操作参数，如下所示：盐度为0.6％，流量为75kg / h，温度为45摄氏度，新鲜蒸汽流量为17m（3）/ h的给水。最大CR和GOR分别高达5.08和4.13。

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