Simulation of desulphurization wastewater evaporation through flue gas

Ye, Xinglian; Zhang, Chucheng; Wang, Shuai; Ding, Yang; Guo, Bin; An, Xizhong; Yu, Aibing

doi:10.1016/j.powtec.2019.05.046

Cited by 18 publications

(4 citation statements)

References 22 publications

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“…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

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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.

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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

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“…The process of concentration reduction can be divided into the membrane method and thermal method, in which, the membrane method is generally adaptable to water quality and pre-processing is required; at present, there are few long-cycle reliable operations in China's power industry. Thermal concentration [8][9][10][11], with the heat source of low-temperature flue gas or vapor, is highly resistant to high turbidity, COD and pollution, and there is no need of pre-processing; therefore, with the simpler process and lower initial investment, it is more advantageous than the membrane method. The end-drying and curing mainly adopts the main flue and bypass flue drying method, as well as dry slag wetting method.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Calculation and Design for Desulfurization Wastewater Flue Gas Evaporation Zero Discharge System of the 1,000 MW Unit

Wang,

Xie,

Wang

et al. 2024

Advances in Transdisciplinary Engineering

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For achieving zero discharge of desulfurization wastewater, the 2×1,000MW Unit of a power plant in Hunan adopts the process of “low-temperature flue gas evaporation and concentration+high-temperature flue gas bypass drying and curing”. The heat source of the low-temperature concentration tower comes from the flue gas (97°C) after the induced draft fan, for direct heat exchange in the tower through counter-current spraying of desulfurization wastewater, with the concentration ratio of 4 or above. The high-temperature flue gas bypass drying tower extracts high-temperature flue gas in front of inlet of the air pre-heater, and process the concentrated solution in the rotary atomizing and drying tower for zero discharge. This paper focuses on studying the thermodynamic calculation regarding the low-temperature flue gas evaporation and concentration system and high-temperature flue gas drying and curing system, so as to establish a balance of quality and capability, and calculate the basic data for system design by the trial method. Meanwhile, it further studies the quantitative calculation of impact of the zero discharge system on thermal and economic indexes such as boiler efficiency and standard coal consumption. The maximum processing rate of each 1,000MW Unit can reach 13m3/h, requiring 13.61% of low-temperature flue gas. The high-temperature drying tower is designed to dry the concentrated solution at a rate of 6m3/h, requiring 1.73% of high-temperature flue gas. As a result, the temperature of flue gas at the outlet of the air pre-heater can be lowered by about 3°C, the air temperature at the primary and secondary outlets can be lowered by about 1°C, the boiler efficiency can be decreased by 0.066%, and standard coal consumption can be increased by about 0.183g/kWh.

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“…Considering the difficulty in obtaining detailed flow field, temperature field and midity field data through experimental methods, some scholars have used computatio fluid dynamics (CFD) to numerically simulate the spray drying process and give vari evaporation models [26][27][28][29]. Gradinger et al [30] established a zero-dimensional dro Many researchers have studied the evaporation characteristics of droplets by means of theoretical calculations and experimental methods.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on Centrifugal Spray Evaporation Characteristics and Process Optimization of Desulfurization Wastewater

Zhao

Feng

et al. 2021

Coatings

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As an advanced treatment of desulfurization wastewater, centrifugal spray drying technology, which can achieve a zero liquid discharge target, has attracted wide attention and great interest in recent years. However, the results of previous studies were based on the laboratory-scale centrifugal spray dryer. In order to study the evaporation characteristics of desulfurization wastewater and the parameter optimization of the dryer, the evaporation model of wastewater droplets was established. The effects of parameters such as the angle of the deflectors, gas–liquid ratio and atomizer speed on droplet evaporation were studied by numerical simulation. The results show that with the increase in the angle of the deflectors, the swirl effect of flue gas flow field is more obvious and the time and axial distance required for the complete evaporation of the droplets are shorter. Reducing the gas–liquid ratio will make the average evaporation time longer. Moreover, a higher atomizer speed is helpful for the evaporation of the droplets. The optimum gas–liquid ratio and rotational speed are found to be 9300 m3/Nm3 and 16,000 rpm, respectively.

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Simulation of desulphurization wastewater evaporation through flue gas

Cited by 18 publications

References 22 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

Thermodynamic Calculation and Design for Desulfurization Wastewater Flue Gas Evaporation Zero Discharge System of the 1,000 MW Unit

Simulation Study on Centrifugal Spray Evaporation Characteristics and Process Optimization of Desulfurization Wastewater

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