Split, Partial Oxidation and Mixed Absorption: A Novel Process for Synergistic Removal of Multiple Pollutants from Simulated Flue Gas

Fang, Ping; Tang, Zilong; Chen, Xiongbo; Huang, Jiankang; Chen, Dingsheng; Tang, Zhixiong; Cen, Chaoping

doi:10.1021/acs.iecr.6b05029

Cited by 12 publications

(16 citation statements)

References 27 publications

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“…(3) Finally, the sample was taken and filtered under vacuum using a 0.45 μm microporous membrane filter. e filtrates were analyzed for SO 4 2− and other ions, and finally, the SO 4 2− and other ions removal efficiencies were calculated by (1). According to the above steps, batch experiments effecting different experimental conditions on SO 4 2− removal were implemented, including Ca(OH) 2 dosage (the molar ratios of Ca(OH) 2 to SO 4 2− of 1∼6 : 1), NaAlO 2 dosage (the molar ratios of NaAlO 2 to SO 4 2− of 0.7∼3 : 1), solution initial pH (3.0∼11.0), solution temperature (25∼80°C), reaction time (15∼120 min), stirring speed (100∼500 r/min), and the concentrations of Cl…”

Section: Removal Of Sulfate Ionsmentioning

confidence: 99%

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Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Fang

Tang

Chen

et al. 2018

Journal of Chemistry

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e feasibility of removal of sulfate ions from the sodium alkali FGD wastewater using the ettringite precipitation method was evaluated. Factors affecting the removal of sulfate ions, such as NaAlO 2 dosage, Ca(OH) 2 dosage, solution temperature, anions (Cl − , NO 3 − and F − ), and heavy metal ions (Mg 2+ and Mn 2+ ), were investigated, and the optimal experimental conditions for the removal of sulfate ions were determined. Experimental results indicate that the ettringite precipitation method can effectively remove SO 4 2− with removal efficiency of more than 98%. All the investigated factors have influences on the removal of sulfate ions, and among them, the dosage of reagents, solution temperature, and fluoride ions have the strongest influence. In addition, the method can effectively synergistically remove F − and heavy metal ions with removal efficiencies of more than 90% and 99%, respectively; meanwhile, Cl − and NO 3 − also can be removed minimally by the method. e result of actual wastewater treatment shows that the method is feasible for treating high-concentration sulfate wastewater. e ettringite precipitation method has the potential to be a commercial application in the future.

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Section: Removal Of Sulfate Ionsmentioning

confidence: 99%

“…At present, the wet flue gas desulfurization (WFGD) is the most commonly used technology in the field of industrial flue gas desulfurization in China [1]. For power plant flue gas desulfurization, the main technology used in China is limestone-gypsum wet process.…”

Section: Introductionmentioning

confidence: 99%

Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Fang

Tang

Chen

et al. 2018

Journal of Chemistry

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“…Based on the literature and on our previous works [12,20,22,23], NaClO 2 , KMnO 4 , and Na 2 S 2 O 8 were considered as better NO oxidants. Thus, in this study, the contrast experiments for different oxidants on SO 2 and NO x removal were investigated, and the results are displayed in Figures 2 and 3.…”

Section: Simultaneous Removal Of So 2 and No X With Different Oxidantmentioning

confidence: 99%

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

et al. 2018

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In this work, the feasibility of the simultaneous removal of NOx and SO2 through a simple process using a composite absorbent (NaClO2/Na2S2O8) was evaluated. Factors affecting the removal of NOx and SO2, such as NaClO2 and Na2S2O8 concentrations, solution temperature, the initial pH of solution, gas flow rate, and SO2, NO, and O2 concentrations were studied, with a special attention to NOx removal. Results indicate that a synergistic effect on NOx removal has been obtained through combination of NaClO2 and Na2S2O8. NaClO2 in the solution played a more important role than did Na2S2O8 for the removal of NOx. The above factors had an important impact on the removal of NOx, especially the solution temperature, the initial pH of the solution, and the oxidant concentrations. The optimum experimental conditions were established, and a highest efficiency of NOx removal of more than 80% was obtained. Meanwhile, tandem double column absorption experiments were conducted, and a NOx removal efficiency of more than 90% was reached, using NaOH solution as an absorbant in the second reactor. A preliminary reaction mechanism for NOx and SO2 removal was deduced, based on experimental results. The composite absorbent has the potential to be used in the wet desulfurization and denitration process, to realize the synergistic removal of multi-pollutants.

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“…It implies that the molar ratio of reactants of NO and NaClO 2 in the reactor increased up to 2:1. One could deduce that the oxidation and absorption process of NO by the NaClO 2 mist might involve the reactions below [26,38]:…”

Section: Comparison Of Different Oxidants In Mistmentioning

confidence: 99%

NO Removal from Simulated Flue Gas with a NaClO2 Mist Generated Using the Ultrasonic Atomization Method

et al. 2018

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In order to enhance the mass transfer efficiency between gas-liquid interfaces, NaClO 2 mist generated by an ultrasonic humidifier was used to remove NO from simulated flue gas. The effects of some key parameters (the gas flow rate, the NaClO 2 concentration in the solution, the inlet NO concentration, the NaClO 2 solution pH) on NO removal efficiency were investigated preliminarily. The results showed that NaClO 2 mist could oxidize NO with a much higher efficiency compared with other mists containing either NaClO or H 2 O 2 as oxidants. With an increase in the gas flow rate from 1.5 to 3.0 L·min −1 , the atomizing rate of the NaClO 2 solution increased almost linearly from 0.38 to 0.85 mL·min −1 . When the gas flow rate was 2.0 L·min −1 , a complete removal of NO had been reached. NO removal efficiency increased obviously with an increase in the NaClO 2 concentration in the solution. With an increase in the inlet NO concentration, the ratio of NO in the flue gas and NaClO 2 in the mist increased almost linearly. Furthermore, the NaClO 2 mist exhibited a relatively stable and high NO x removal efficiency in a wide pH range (4-11) of NaClO 2 solutions. The reason for the high NO removal efficiency was mainly ascribed to both the strong oxidative ability of NaClO 2 and the improved mass transfer at the gas-liquid interface.Energies 2018, 11, 1043 2 of 15 system to avoid ammonia slip. For SNCR, its NO x removal efficiency is obviously lower than that of SCR. Furthermore, a very high reaction temperature of 850-1100 • C is essential for SNCR to facilitate the reduction reaction between NO x and the reductants [10]. Since both SCR and SNCR belong to the dry methods for NO removal, they have to be combined in series with a wet scrubbing desulfurization process for the simultaneous removal of NO x and SO 2 . Such an integrated system suffers from some obvious drawbacks, such as the high cost, large size, complicated operation, and so on. To a great extent, these factors limit the application of the integrated system in some industrial areas.In recent years, more and more researchers have been interested in developing new methods for the simultaneous removal of NO x and SO 2 based on wet scrubbing processes [11]. In such cases, appropriate additives are required to improve the water solubility of NO x . A number of reports have suggested NO removal with the help of an iron chelating agent such as Fe 2+ -EDTA (Ethylene Diamine Tetraacetic Acid) because of its fast absorption rate for NO and high absorption capacity. However, the chelating agent could be easily oxidized by NO, NO 2 , and O 2 in flue gas to form Fe 3+ -EDTA that is not capable of binding with NO [12]. It also needs to overcome other main drawbacks such as the high cost of EDTA, and the need to remove the N-S complex [13]. Another possible way is to oxidize the insoluble NO into soluble NO 2 , and then the NO x molecules can be absorbed through wet scrubbing using the proper absorbents [14]. Although both nonthermal plasma and ozone can be used as excellent...

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Split, Partial Oxidation and Mixed Absorption: A Novel Process for Synergistic Removal of Multiple Pollutants from Simulated Flue Gas

Cited by 12 publications

References 27 publications

Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Simultaneous Removal of NOx and SO2 through a Simple Process Using a Composite Absorbent

NO Removal from Simulated Flue Gas with a NaClO2 Mist Generated Using the Ultrasonic Atomization Method

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