Analysis of the energy consumption of supercritical water desalination (SCWD)
Analysis of the energy consumption of supercritical water desalination (SCWD)
复制标题
超临界水淡化（SCWD）能耗分析
DOI：
10.1016/j.desal.2019.114189
复制
发表时间：
2020
期刊：
影响因子：
9.9
通讯作者：
S. Kersten
中科院分区：
文献类型：
--
作者：
S. V. Wyk;A. V. D. Ham;S. Kersten
进行了一项实验和建模研究，以研究超临界水淡化 (SCWD) 的能耗与 NaCl 浓度（0 至 20wt%）的函数关系。针对不同的流速和进料浓度进行了中试装置实验，并用于验证用于相平衡和焓计算的热力学模型（eNRTL 和 Anderko & Pitzer）。实验和建模结果表明，降低进料流的热容量，同时将浓度从 0 增加到 7wt%，可以改善进料 - 超临界水 (SCW) 热交换器 (HEX) 的性能，这从较高的进料出口温度可以明显看出。对于 ≥14wt% 的浓度，建议在 HEX 之前预热进料，因为 SCW 盐水分离器中的 SCW 回收率会降低。由于进料热容量的降低，计算出的将热交换后的进料加热到分离温度的加热器的负荷随着 NaCl 浓度的增加而降低。经计算，SCWD 的总能耗在 0.71 至 0.90MJth/kg 饲料之间。对于较高浓度的进料，能量输入分为低质量（温度）热量和高质量（温度）热量。
An experimental and modelling study was done to investigate supercritical water desalination (SCWD) with respect to energy consumption as a function of the NaCl concentration (0 to 20 wt%). Pilot plant experiments were performed for different flow rates and feed concentrations, and used for the validation of the thermodynamic models (eNRTL and Anderko & Pitzer) employed for phase equilibria and enthalpy calculations. Experimental and modelling results showed that the lowered heat capacity of the feed streams, while increasing the concentration from 0 to 7 wt%, leads to improved performance of the feed - supercritical water (SCW) heat exchanger (HEX), evident from a higher feed outlet temperature. For concentrations of ≥14 wt%, pre-heating of the feed, prior to the HEX, is recommended due to the decrease in the SCW recovery in the SCW-brine separator. The calculated duty, of the heater bringing the heat-exchanged feed to the separation temperature, decreases with NaCl concentration due to the decrease in the feed heat capacity. The calculated overall energy consumption of SCWD was between 0.71 and 0.90 MJth/kgfeed. For higher concentration feeds, the energy input is divided between low – and high quality (temperature) heat.