Energy and exergy analyses of circulatory flash evaporation of aqueous NaCl solution

Wang, Yu; He, Qun; Yang, Qianzi; Zhang, Dan; Liu, Ming; Yan, Junjie

doi:10.1016/j.desal.2018.02.011

Cited by 7 publications

(1 citation statement)

References 45 publications

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“…The results showed that under the same superheated condition, the non-equilibrium fraction decreased with the increase of mass flow rate and flash pressure, and increased with the increase of liquid level height and NaCl concentration. Wang et al [20] analyzed the energy and exergy of NaCl solution circulatory flash process, and the result showed that as the liquid level height and NaCl concentration decreased, the energy utilization rate increased, and increased equilibrium pressure could improve the energy utilization rate.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Study of Circulatory Flash Evaporation System for High-Salt Wastewater Treatment

Feng,

Chen,

Sun

et al. 2024

Energies

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Treatment methods for high-salt wastewater mainly consist of physical methods, chemical methods and biological methods. However, there are some problems, such as slow treatment speed, high investment costs and low treatment efficiency. To address NaCl solutions, in this study, a circulatory flash system was designed based on gas–liquid equilibrium, mass conservation equation and energy conservation equation. A circulatory flash evaporation simulation and a static flash evaporation experiment were conducted on NaCl solutions under various operating conditions to investigate the effects of heating temperature, flash pressure and initial NaCl concentration on the circulatory flash evaporation system. The significance of each factor’s influence on the evaporation fraction and energy consumption was examined through static flash experiments. The simulation results demonstrated that increasing the heating temperature, decreasing the flash pressure and having a higher initial NaCl concentration could enhance the treatment capacity of high-salt wastewater. The flow rate of vapor outlets increased with higher heating temperature but decreased as the flash pressure rose. The experimental results demonstrated that flash evaporation pressure was the primary factor influencing both the evaporation fraction and the energy consumption per unit mass of vapor produced. It was observed that with an increase in heating temperature, the flash pressure decreased and there was a corresponding decrease in energy consumption per unit mass of vapor produced. The optimal experimental conditions were achieved at a heating temperature of 99 °C, a flash pressure of 15 kPa, and an initial NaCl concentration of 20%.

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Section: Introductionmentioning

confidence: 99%