The effect of solid particles on the evaporation and crystallization processes of the desulfurization wastewater droplet

Liang, Zhengxing; Zhang, Li; Yang, Zhongqing; Cheng, Xining; Pu, Ge; Ran, Jingyu

doi:10.1016/j.applthermaleng.2017.12.119

Cited by 26 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The technologies for desulfurization wastewater treatment primarily encompass chemical precipitation [8][9][10], evaporative crystallization [11], spray evaporation [12,13], membrane separation [14][15][16], and biological treatment technology [17]. Chemical precipitation is the most commonly employed technology, which can remove suspended solids and heavy metal ions from wastewater efficiently.…”

Section: Introductionmentioning

confidence: 99%

Separation of Chloride and Sulfate Ions from Desulfurization Wastewater Using Monovalent Anions Selective Electrodialysis

Tian,

Yue,

Hou

et al. 2024

Membranes

View full text Add to dashboard Cite

The high concentration of chloride ions in desulphurization wastewater is the primary limiting factor for its reusability. Monovalent anion selective electrodialysis (S-ED) enables the selective removal of chloride ions, thereby facilitating the reuse of desulfurization wastewater. In this study, different concentrations of NaCl and Na2SO4 were used to simulate different softened desulfurization wastewater. The effects of current density and NaCl and Na2SO4 concentration on ion flux, permselectivity (PSO42−Cl−) and specific energy consumption were studied. The results show that Selemion ASA membrane exhibits excellent permselectivity for Cl− and SO42−, with a significantly lower flux observed for SO42− compared to Cl−. Current density exerts a significant influence on ion flux; as the current density increases, the flux of SO42− also increases but at a lower rate than that of Cl−, resulting in an increase in permselectivity. When the current density reaches 25 mA/cm2, the permselectivity reaches a maximum of 50.4. The increase in NaCl concentration leads to a decrease in the SO42− flux; however, the permselectivity is reduced due to the elevated Cl−/SO42− ratio. The SO42− flux increases with the increase in Na2SO4 concentration, while the permselectivity increases with the decrease in Cl−/SO42− ratio.

show abstract

Section: Introductionmentioning

confidence: 99%

Separation of Chloride and Sulfate Ions from Desulfurization Wastewater Using Monovalent Anions Selective Electrodialysis

Tian,

Yue,

Hou

et al. 2024

Membranes

View full text Add to dashboard Cite

show abstract

“…They found that increasing the injection velocity and the liquid film thickness and reducing the flue gas velocity was beneficial to evaporation. Liang [19] studied the effect of solid particles on evaporation and crystallization process. The results showed that solid particles had no effect on evaporation, but the solid particles in desulfurization wastewater, such as SiO 2 , CaCO 3 , Fe 2 O 3 , and Fe 3 O 4 , sped up the crystallization.…”

Section: Introductionmentioning

confidence: 99%

Economic Analysis of Atomization Drying of Concentrated Solution Based on Zero Discharge of Desulphurization Wastewater

Zhao

Feng

et al. 2022

Water

View full text Add to dashboard Cite

With the improvement of environmental protection requirements, more and more attention has been given to desulphurization wastewater with zero discharge in coal power plants. Atomization drying is part of the main zero discharge technologies at present. Economic analysis of the atomization drying of desulphurization wastewater is beneficial to the formulation of an appropriate operation scheme and to the reduction of operation costs. The economic analysis and sensitivity analysis of different operating conditions such as unit load, the handling capacity of concentrates, and the temperature of the extracted flue gas in the atomization drying process of concentrated desulfurized wastewater were carried out in this paper. The main cost of the drying process came from the influence of flue gas extraction on the overall heat transfer in the boiler, resulting in the decrease in power generation revenue, which can reach more than 80%. The operating cost of auxiliary machinery was relatively low. The cost of treatment for per ton of concentrates increased first and then decreased with the increase in temperature of the extracted flue gas, and it decreased with the increase in the handling capacity of the concentrates. The effect of a unit load on the treatment cost was also related to the temperature of the extracted flue gas, and the optimal flue gas temperature increase to higher temperatures as the unit load decreased. The minimum treatment costs per ton of concentrate ranged from CNY 143.54/t to CNY 158.77/t under different unit loads. Sensitivity analysis showed that the temperature of the extracted flue gas had the greatest impact on treatment cost, and its sensitivity coefficient was 0.0834. The ways in which to improve economic benefits were discussed.

show abstract

“…They analyzed the effect of temperature and droplet size on the evaporation and crystallization processes. Also, with the same technique, they 17 investigated the effect of the solid particles in the gas flue on the evaporation and crystallization processes of the wastewater droplet. Particles of SiO 2 , CaCO 3 , Fe 2 O 3 , Fe 3 O 4 , and fly ash could increase the crystallization rate, but Al 2 O 3 could inhibit the nucleation process.…”

Section: Introductionmentioning

confidence: 99%

Study of Main Solutes on Evaporation and Crystallization Processes of the Desulfurization Wastewater Droplet

et al. 2018

Self Cite

View full text Add to dashboard Cite

In this study, the evaporation and crystallization processes of the desulfurization wastewater droplet with different concentrations of main solutes were analyzed by TGA and DSC methods. The drying crystals were scanned by a scanning electron microscope. The supersolubilities were measured by the laser intensity detecting method. A mathematic model was built to investigate the relationship between the evaporation and crystallization rates and the species and concentrations of the solutes. The results show that, comparing SO4 2– with Cl–, the higher concentration of SO4 2– gives higher evaporation rate (4.75 min of 0.006 mol NaCl, 4.5 min 0.003 mol Na2SO4) and lower crystallization rate (2.2 min of 0.006 mol NaCl, 2.5 min of 0.003 mol Na2SO4). This is because the vapor pressure is higher and the supersolubility is lower when the concentration of SO4 2– is higher. Comparing Mg2+ with Na+, the changing concentration hardly affects the evaporation rate because of similar vapor pressure. The higher concentration of Mg2+ leads to higher crystallization rate (2.1 min of 0.003 mol MgCl2, 2.2 min of 0.006 mol NaCl) due to the lower supersolubility. In the measurements of Ca2+, Mg2+, and Na+, the evaporation durations (around 4.45 min) and crystallization durations (2–2.05 min) are almost the same because of the low concentration solutes. According to the SEM results, the crystallization rate order when adding different ions is Mg2+ > Ca2+ > Na+.

show abstract

The effect of solid particles on the evaporation and crystallization processes of the desulfurization wastewater droplet

Cited by 26 publications

References 25 publications

Separation of Chloride and Sulfate Ions from Desulfurization Wastewater Using Monovalent Anions Selective Electrodialysis

Separation of Chloride and Sulfate Ions from Desulfurization Wastewater Using Monovalent Anions Selective Electrodialysis

Economic Analysis of Atomization Drying of Concentrated Solution Based on Zero Discharge of Desulphurization Wastewater

Study of Main Solutes on Evaporation and Crystallization Processes of the Desulfurization Wastewater Droplet

Contact Info

Product

Resources

About