Fundamental Research and Demonstration Project of Evaporation Treatment of Wastewater from FGD in Flue Gas Duct

Jiang, Dan; Sha, Hai Wei; Gong, Guo Hui; Song, Jing; Xu, Hai Tao; Zhou, Chang Cheng; Shen, Kai

doi:10.4028/www.scientific.net/amr.864-867.434

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…), the designing process which incorporates modeling and numerical simulation becomes much easier and thus saves researchers and engineers much time and cost of field experiments. Specifically, FLUENT, as a typical general purpose computational fluid dynamics (CFD) code, has been frequently applied by CAE engineers in the field of water treatment, because hydrodynamic lays a solid foundation for the design, evaluation, and optimization for structures (Balan et al, 2019; Braak et al, 2017; Ding et al, 2013; Fan et al, 2007; Jensen et al, 2006) and equipment (Ibrahim et al, 2013; O'Doherty et al, 2009) for a long time (Bush & Silveston, 1978; Glover et al, 2006; Jiang et al, 2014; Peng et al, 2014). Recently, with the development of energy and dissipation models, the performance of FLUENT solver in simulating the mixing process within in‐line static mixers has been validated by a large number of published papers (Hobbs & Muzzio, 1997; Byrde & Sawley, 1999; Cheng et al, 2016; Haddadi et al, 2020; Hobbs et al, 1998; Hobbs, Muzzio, 1998a, 1998b; Ir & Lecjaks, 2011; Kumar et al, 2008; Lang et al, 1995; Rahmani et al, 2007; Rauline et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

A novel design of in‐line static mixer for permanganate/bisulfite process: Numerical simulations and pilot‐scale testing

Han

Guan

Sun

et al. 2022

Water Environment Research

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An increasing number of chemical technologies to wipe out contaminants within an incredibly short period of time have been developed recently, while their application was always hindered by the inefficient or improper mixing of reactants. To address this issue, the present work proposed a new static mixer named Tai-Chi which consists of blade, fin, and spoiler elements. Tai-Chi mixer can slice and divert the solutions inside and generate high shear flow to promote mixing process. Numerical simulations helped to determine the optimal operating conditions for Tai-Chi mixer, including laying its components anterior to the injection nozzles and keeping the velocity rate ratio of main pipe to branch pipe within the range of 0.5 to 1. Numerical simulations further proved that Tai-Chi mixer could strike a great balance between mixing performance (coefficient of variation [CoV] reaches 0.1 within 5 to 7 pipe diameters downstream) and head loss (nearly a half of other high shear static mixer in the market). Data of pilot-scale testing by Tai-Chi mixer confirm that 80% sulfamethoxazole could be eliminated in permanganate/bisulfite process within 8 pipe diameters, as well as showed the superiority of Tai-Chi's mixing performance in early stage compared with other static mixers in the market. Practitioner Points• A Tai-Chi static mixer with blade, fin, and spoiler elements is devised.• The optimal condition of flow rate and installment of Tai-Chi mixer is determined.• Ultra-fast mixing is achieved by Tai-Chi (CoV < 0.1 within 5-7 pipe diameters).• Pilot-scale test verifies the mixing efficiency of Tai-Chi mixer.

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Section: Introductionmentioning

confidence: 99%

A novel design of in‐line static mixer for permanganate/bisulfite process: Numerical simulations and pilot‐scale testing

Han

Guan

Sun

et al. 2022

Water Environment Research

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“…The most widely used desulfurization technology in coal power plants is limestone-gypsum wet flue gas desulphurization (WFGD) technology [1,2]. To ensure the desulfurization efficiency and equipment safety, the fluorine and chlorine content in the desulfurization liquid slurry should be controlled within a certain range, so it is necessary to regularly discharge desulfurization wastewater to maintain the chlorine balance of the system [3,4]. There are a lot of pollutants in desulfurization wastewater [5,6], meaning that desulfurized wastewater cannot be directly discharged or directly reused and needs to be treated [7].…”

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

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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.

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“…After the triple box process of “neutralization, coagulation, and precipitation”, the content of heavy metals and suspended solids in desulfurization wastewater is reduced but that of chlorine remains high. The 2017 guidelines on feasible technologies for the prevention and control of pollution in thermal power plants (HJ2301-2017) indicated that the key to achieving a near-zero discharge of wastewater is to realize a zero discharge of desulfurization wastewater. − The main methods currently used to remove Cl – from wastewater include electric coagulation, ion exchange, and adsorption. − Adsorption is regarded as one of the effective ways to uptake Cl – from wastewater due to its advantages of simple operation, recyclability, etc.…”

Section: Introductionmentioning

confidence: 99%

Removal of Chlorine Ions from Desulfurization Wastewater by Modified Fly Ash Hydrotalcite

Liu

et al. 2020

ACS Omega

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The effective removal of chlorine ion from the desulfurization slurry is of great significance to the stable operation of the desulfurization system. Modified fly ash hydrotalcites were prepared by alkali/acid-combined roasting and microwaving and used as an adsorbent for chlorine ion in desulfurized wastewater. The specific surface area and porosity of different adsorbents were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The impacts of pH, temperature, adsorbent dosage, and adsorption shaking time on adsorption performance were investigated. Results showed the alkali-combined roasting-modified fly ash hydrotalcite has the optimum removal effect on Cl–. The optimal adsorption performance was achieved when the pH was 8, the adsorption temperature was 60 °C, the mass concentration of adsorbent was 10 g/L, the adsorption shaking time was 180 min, and the removal percentage of Cl– was 68.1%. The adsorption isotherm was consistent with the Langmuir isotherm model, and the adsorption saturation was 694.4 mg/g, which belonged to monolayer adsorption.

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Fundamental Research and Demonstration Project of Evaporation Treatment of Wastewater from FGD in Flue Gas Duct

Cited by 6 publications

References 3 publications

A novel design of in‐line static mixer for permanganate/bisulfite process: Numerical simulations and pilot‐scale testing

A novel design of in‐line static mixer for permanganate/bisulfite process: Numerical simulations and pilot‐scale testing

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

Removal of Chlorine Ions from Desulfurization Wastewater by Modified Fly Ash Hydrotalcite

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