Inorganic Chemicals Industry >
Study on evaporation and concentration characteristics of desulfurization wastewater
Received date: 2024-10-09
Online published: 2025-10-27
Power plant desulfurization wastewater is characterized by high salinity，high hardness，and complex composition.Due to the unclear laws of salt precipitation and basic physical properties during wastewater evaporation and concentration，it is difficult to achieve precise control of the evaporation and volume reduction treatment process，resulting in severe equipment scaling and low resource utilization.Therefore，based on the thermodynamic phase equilibrium laws of multi-component water-salt systems，the atmospheric evaporation and salt precipitation laws and crystal phase transformation behaviors of two typical types of desulfurization wastewater（chloride and sulfate types） were investigated.The changes in boiling point，concentration ratio，and ion composition of the wastewater under different evaporation rates were explored.The feasibility of guiding the evaporation and salt precipitation process design with thermodynamic phase diagrams was verified through experiments.The order of salt precipitation during evaporation for both types of wastewater was amorphous organic impurities，gypsum（CaSO4·2H2O），and sodium chloride.To ensure the separate precipitation of gypsum，the boiling points of the concentrated chloride and sulfate wastewater should be controlled at 106 ℃ and 108 ℃ respectively，with corresponding vaporization rates of over 85%.Additionally，it was found that calcium sulfate precipitated as gypsum（CaSO4·2H2O） in the initial stage of evaporation.In a high-temperature hydrothermal environment（>100 ℃），it began to dehydrate and transform into CaSO4 within 240 minutes，with the transformation being completed in 360 minutes.It clarified the application conditions for the gypsum crystallization anti-scaling technology.The study provided key process parameters for the evaporation and volume reduction treatment of desulfurization wastewater，which had significant practical value for improving the water-saving and energy-saving capabilities of power plants.
CHEN Haijie , MA Xiaoyue , WEI Xin , SUN Congcong , YU Zikai , YANG Jing , WANG Yanfei . Study on evaporation and concentration characteristics of desulfurization wastewater[J]. Inorganic Chemicals Industry, 2025 , 57(10) : 103 -110 . DOI: 10.19964/j.issn.1006-4990.2024-0531
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