Nitrogen Oxide Removal from Simulated Flue Gas by UV-Irradiated Sodium Chlorite Solution in a Bench-Scale Scrubbing Reactor

Yang, Shunkun; Pan, Xinxiang; Han, Zhitao; Zheng, Dekang; Yu, Jingqi; Xia, Pengfei; Liu, Bojun; Yan, Zhijun

doi:10.1021/acs.iecr.6b04463

Cited by 26 publications

(9 citation statements)

References 31 publications

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“…Generally, the increase of molar ratio would promote the mass-transfer driving force of NO, which improves the oxidation and absorption of NO. However, NO concentration in the gas was relatively much higher than that of the NaClO2 mist, it seemed to be reasonable to obtain a declining NO removal rate [39]. As shown in Figure 7, when the NO concentration changed from 100 ppm to 300 ppm, the NO removal efficiency for 0.01 mol·L −1 NaClO2 concentration decreased from 50.5% to 41.5%, but the NO removal efficiency for 0.02 mol·L −1 NaClO2 concentration increased from 72.1% to 78.8%.…”

Section: Effect Of No Concentrationmentioning

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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Section: Effect Of No Concentrationmentioning

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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“…When the NaClO 2 concentration reached 0.02 mol/L, the increase in the NO removal rate slowed down and it was finally maintained at 68.11%. The mass transfer equation of the chemical absorption in the liquid phase [15] is:…”

Section: Effect Of Naclo2 Concentration On Denitrification Ratementioning

confidence: 99%

Simulataneous removal of nitrogen and sulfur oxides using the NaClO₂/NaOH composite absorbent via ultrasonic atomization

Lin

Liu

2020

E3S Web Conf.

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In this study, NaClO2 was used as an oxidant and mixed with NaOH to prepare a sodium-based composite absorbent. Simultaneous desulfurization and denitrification experiments were conducted in an ultrasonic atomization reactor and the effects of experimental parameters including pH value, NaClO2 concentration, initial concentration of NO, reaction temperature, the addition of SO2 and the utilization of ultrasonic atomization on desulfurization and denitrification efficiencies were investigated. Under the circumstance of the pH of 10, oxygen content of 8%, reaction temperature of 55oC, and NO concentration of 500 mg/m3, SO2 concentration of 1400 mg/m3, 69.38% of NO and 99.95% of SO2 can be removed using the composite absorbent composed of 0.02 mol/L NaClO2 and 0.1mmol/L NaOH. Ultrasonic atomization increased the denitrification rate by 10.6%.

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“…The removal rates of SO 2 and NO were 100% and 82.7%, respectively, under the optimum conditions. Yang et al [93] used ultraviolet radiation sodium chlorite (UV/NaClO 2 ) solution to remove NO x from simulated flue gas in a small scrubbing reactor. The results showed that the addition of Cu and Mn resulted in the lattice expansion and micro-strain decrease of CeO 2 -ZrO 2 , which led to the formation of oxygen vacancies.…”

Section: No X Removed By Liquid-phase Oxidationmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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Nitrogen Oxide Removal from Simulated Flue Gas by UV-Irradiated Sodium Chlorite Solution in a Bench-Scale Scrubbing Reactor

Cited by 26 publications

References 31 publications

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

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

Simulataneous removal of nitrogen and sulfur oxides using the NaClO₂/NaOH composite absorbent via ultrasonic atomization

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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Nitrogen Oxide Removal from Simulated Flue Gas by UV-Irradiated Sodium Chlorite Solution in a Bench-Scale Scrubbing Reactor

Cited by 26 publications

References 31 publications

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

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

Simulataneous removal of nitrogen and sulfur oxides using the NaClO2/NaOH composite absorbent via ultrasonic atomization

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

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Product

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Simulataneous removal of nitrogen and sulfur oxides using the NaClO₂/NaOH composite absorbent via ultrasonic atomization