Simultaneous removal of NOx and SO2 using two-stage O3 oxidation combined with Ca(OH)2 absorption

Zou, Yang; Wang, Yan; Liu, Xiaolong; Zhu, Tong; Tian, Mengkui; Cai, Maoyu

doi:10.1007/s11814-020-0597-z

Cited by 18 publications

(5 citation statements)

References 46 publications

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“…In addition, the solubility of NO and NO 2 in water is 0.032 and 213.0 g/L, respectively. [ 73 ] The solubility of NO 2 is 6656 times that of NO, thus NO 2 is more soluble in water and forms NO 3 − . In short, due to the high reaction rate and solubility of NO 2 , NO 3 − becomes the main product of PAW in liquid, while NO becomes the main product of PAW in gas phase.…”

Section: Resultsmentioning

confidence: 99%

Electrodeless discharge in water: Reactive species in liquid and gas phase and energy cost for nitrogen fixation

Luo

Nie

Liu

et al. 2022

Plasma Processes & Polymers

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One of the main barriers stopping plasma activated water (PAW) in many practical applications is its high energy cost. On the other hand, a careful review of published literature finds that all the studies reported on the PAW only focus on the reactive species generated in liquid, and there is no measurement of the possible reactive species in the gas phase during the generation of PAW, which might contain high concentration reactive species especially for the cases when gas bubbling is used during the generation of PAW. In this paper, an electrodeless plasma device is reported, where distilled water, tap water, and saline water are used as working liquid while O 2 , N 2 , and air are flowing through the liquid. Not only the reactive species presented in the liquid phase, the reactive species contained in the gas phase were analyzed for the first time in the field of PAW nitrogen fixation. It was found that the total number of moles of reactive species in gas phase is actually several times higher than that in liquid phase. Only when considering the reactive nitrogen species (RNS) in the liquid phase, the lowest energy cost is about 18.97 MJ/mol when air is flowing though the tap water. On the other hand, when both the RNS in liquid phase and in gas phase are included, the lowest energy cost achieved is 5.53 MJ/mol when air is flowing through distilled water, which is only one-seventh of the lowest energy cost reported on PAW. This study helps us shed light on plasma nitrogen fixation by using PAW, which has been greatly underestimated due to the overlooking of gas phase products of PAW in the past.

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Section: Resultsmentioning

confidence: 99%

Electrodeless discharge in water: Reactive species in liquid and gas phase and energy cost for nitrogen fixation

Luo

Nie

Liu

et al. 2022

Plasma Processes & Polymers

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“…The oxidants studied mainly contained hydrogen peroxide (H 2 O 2 ), , sodium persulfate (Na 2 S 2 O 8 ), sodium hypochlorite (NaClO), sodium chlorite (NaClO 2 ), potassium permanganate (KMnO 4 ), and ozone (O 3 ). The alkaline absorbents studied mainly included ammonia, magnesia slurry, sodium hydroxide, and calcium hydroxide . The principle of these methods was to oxidize NO into NO 2 with high solubility, and then NO 2 was absorbed by alkaline absorbents or hydrolyzed.…”

Section: Introductionmentioning

confidence: 99%

“…The alkaline absorbents studied mainly included ammonia, 19 magnesia slurry, 20 sodium hydroxide, 21 and calcium hydroxide. 22 The principle of these methods was to oxidize NO into NO 2 with high solubility, and then NO 2 was absorbed by alkaline absorbents or hydrolyzed. Almost all NO in exhaust gas was converted into nitrate.…”

Section: Introductionmentioning

confidence: 99%

New Experimental Results of NO_x Removal from Marine Diesel Engines by the Ozone/Urea System: Removal Efficiency and the NO_x Conversion Ratio

Zhang

Zhou

et al. 2023

Energy Fuels

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Ship exhaust gas greatly threatens human health and the environment. The ozone/urea system has the advantages of strong oxidability, excellent reducibility, and low reductant consumption. This paper thoroughly studied the effects of urea concentration, O3 concentration, initial pH, temperature, O2 concentration, SO2 concentration, and initial NO concentration on NO x removal efficiency using the ozone/urea system. Moreover, this paper conducted a systematic study on the conversion proportion of NO x into nitrate and nitrite, which is very important for the ship NO x wet method. Urea concentration and O3 concentration played important roles in NO x removal efficiency. Weak acid and weak alkali media could effectively improve NO x removal efficiency, but the reasons were completely different. As the temperature increased, the NO x removal efficiency initially decreased and subsequently increased. Besides, the increase of temperature and initial pH could decrease the conversion proportions of NO x into nitrate and nitrite. The increase of SO2 concentration could not only reduce the NO x removal efficiency but also increase the conversion proportion of NO x into nitrate. However, increasing SO2 could significantly decrease the conversion proportion of NO x into nitrite. Under the optimal conditions of this paper, the NO x removal efficiency reached 97.8% and the conversion proportion of NO x into nitrate was only 20.39%. In addition, the urea content was just 0.3 mol/L, which was far lower than that in the prior study. This illustrated that the ozone/urea system had excellent application potential in marine exhaust gas purification.

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“…Sulfur oxides and nitrogen oxides are two main pollutant emissions of sintering flue gas in steel plants. , It is necessary to carry out desulfurization and denitrification of sintering flue gas, so as to reduce the pollutant emissions and meet the requirements of environmental protection standards. In recent years, China has further increased the environmental protection requirements of the steel industry, and the SO 2 and NO x emission standards have been raised from low emission standard (≤200 and ≤300 mg/Nm 3 respectively) in 2015 to ultralow standard (35 and 50 mg/Nm 3 respectively). − Given the new standard being adopted, traditional desulfurization and denitrification technologies have to be optimized to achieve the goal of the ultralow emission standard.…”

Section: Introductionmentioning

confidence: 99%

Effect of CO₂ in Simultaneous Removal Process of SO₂ and NO₂ by Hydrated Lime

Zou,

Zhou,

Hong

et al. 2023

Energy Fuels

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Simultaneous removal of NOx and SO2 using two-stage O3 oxidation combined with Ca(OH)2 absorption

Cited by 18 publications

References 46 publications

Electrodeless discharge in water: Reactive species in liquid and gas phase and energy cost for nitrogen fixation

Electrodeless discharge in water: Reactive species in liquid and gas phase and energy cost for nitrogen fixation

New Experimental Results of NO_x Removal from Marine Diesel Engines by the Ozone/Urea System: Removal Efficiency and the NO_x Conversion Ratio

Effect of CO₂ in Simultaneous Removal Process of SO₂ and NO₂ by Hydrated Lime

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Simultaneous removal of NOx and SO2 using two-stage O3 oxidation combined with Ca(OH)2 absorption

Cited by 18 publications

References 46 publications

Electrodeless discharge in water: Reactive species in liquid and gas phase and energy cost for nitrogen fixation

Electrodeless discharge in water: Reactive species in liquid and gas phase and energy cost for nitrogen fixation

New Experimental Results of NOx Removal from Marine Diesel Engines by the Ozone/Urea System: Removal Efficiency and the NOx Conversion Ratio

Effect of CO2 in Simultaneous Removal Process of SO2 and NO2 by Hydrated Lime

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New Experimental Results of NO_x Removal from Marine Diesel Engines by the Ozone/Urea System: Removal Efficiency and the NO_x Conversion Ratio

Effect of CO₂ in Simultaneous Removal Process of SO₂ and NO₂ by Hydrated Lime