Research on red mud-limestone modified desulfurization mechanism and engineering application

Zhang, Yuwei; Wen-min, Qian; Zhou, Pan; Liu, Yu; Lei, Xiaoli; Li, Bin; Ning, Ping

doi:10.1016/j.seppur.2021.118867

Cited by 38 publications

(13 citation statements)

References 45 publications

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“…Water consumption of the limestone-gypsum method can reach 0.45 t/MW•h. By comparison, for circulating fluidized bed (CFB) flue gas desulfurization, which has a similar investment cost to that of the limestone-gypsum method, the water consumption can be reduced by nearly half [18,19]. In thermal power generation, the annual water saving can reach more than 100,000 tons, and the "three wastes" produced are also reduced by orders of magnitude [20,21].…”

Section: Introductionmentioning

confidence: 99%

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

et al. 2021

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In view of the current status of catalytic cracking flue gas treatment, it is necessary to study the flow environment of desulfurization ash particles, which are a type of Geldart C particle, in a circulating fluidized bed (CFB) for semi-dry flue gas desulphurization using CFB technology. This study investigated the flow characteristics of desulphurization ash particles in a riser with an inner diameter of 70 mm and a height of 12.6 m, at a gas velocity of 4–7 m/s and a solids circulation rate of 15–45 kg/m2·s. The solids holdup in the axial distribution is relatively high near the bottom of the riser, and gradually decreases as the riser height increases, with a stable value from the middle to the top of the riser. In the radial distribution, the solids holdup of desulfurization ash particles is low in the center and high in the wall region. Within the above operating conditions, the solids holdup ranges from 0.008 to 0.025. The particle-based Archimedes number has a linear relationship with the solids holdup at all operating conditions.

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Section: Introductionmentioning

confidence: 99%

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

et al. 2021

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“…According to Equation ( 18), the increase of NO concentration in liquid phase would promote the reaction between NO and THS•SO 3 2À complexes. Meanwhile, the increase of SO 2 concentration would also enhance the reaction rate of Equation ( 24), further accelerating the reaction progress of Equation (18). As a result, NO absorption efficiency was improved obviously with the increase of inlet SO 2 concentration.…”

Section: àmentioning

confidence: 97%

“…As NO x oxidation degree increased from 10% to 50%, it meant the decrease of NO concentration and the increase of NO 2 concentration in feed gas. According to Equation (18), coexisting NO and NO 2 will be removed from flue gas by reacting with THS•SO 3 2À .…”

Section: 2 | Effect Of Ths Concentrationmentioning

confidence: 99%

“…During the past decades, a great deal of efforts has been devoted to develop feasible denitration method for marine application. At present, selective catalytic reduction (SCR), [10][11][12][13][14] exhaust gas recirculation (EGR), [15][16][17] and wet denitration [18][19][20][21] have been proven to be efficient NO x removal techniques. SCR system is difficult to integrate with EGCS to remove SO 2 and NO x simultaneously, and it has to replace the SCR catalysts regularly.…”

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confidence: 99%

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A novel method for removing NO_x from simulated marine exhaust gas in wet absorption system using Na₂SO₃/THS composite solution

Liu

Han

et al. 2022

Env Prog and Sustain Energy

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Since it is difficult to deal with high-concentration nitrates in scrubbed wastewater onboard vessels, the application of traditional wet denitration technology is limited to some extent. Here a novel method for removing pre-oxidized NO x by using Na 2 SO 3 /THS composite solution is proposed with the aim to obtain high NO x absorption efficiency and low nitrate concentration in scrubbed wastewater simultaneously. The effects of Na 2 SO 3 concentration, THS concentration, NO x oxidation degree, coexistence of SO 2 and O 2 in flue gas, initial pH value and temperature of absorption solution on denitration performance were discussed in detail. The results showed Na 2 SO 3 could reduce NO x to nitrate, nitrite, and N 2 . The addition of THS could promote NO x absorption greatly by forming complexes with SO 3 2À . When initial NO x concentration was 1000 ppm with a NO x oxidation degree of 50%, O 2 concentration was 8%, Na 2 SO 3 and THS concentrations were 25 and 20 mmol/L, a NO x absorption efficiency of 87% could be achieved, while nitrate and nitrite concentrations were 32.97 and 14.19 mg/L, respectively.

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“…10,11 Therefore, various oxidation methods for denitrification have gradually entered the view of researchers, such as the ozonation method, 12,13 potassium permanganate oxidation method, 14,15 hydrogen peroxide oxidation method, 16,17 and yellow phosphorus oxidation method. 18,19 In addition, recently, some solid wastes have been gradually used as absorbents to eliminate SO 2 and NO x , including pyrolusite, 20,21 red mud, 22,23 steel slag, 24,25 and magnesia, 13,26 under the background of resource recycling and green development. Typically, phosphorus sludge and phosphate rock have drawn researchers' interest, due to their broad application prospects.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Elimination of SO₂ and NO_x from Flue Gas Employing Phosphorus Sludge and Phosphate Rock

Xu,

Yin,

Mei

et al. 2023

Ind. Eng. Chem. Res.

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It is of great significance to achieve resource recycling while eliminating SO2 and NO x pollutants. Herein, the desulfurization and denitrification technology using phosphorus sludge and phosphate rock as absorbents has been attracting significant attention recently, owing to its low cost and pollution-free resource utilization. This paper timely reviews the removal performance, absorption mechanism, and reaction products of this technology, analyzes the dry and wet desulfurization characteristics of phosphate rock, emphasizes the key process of NO oxidation through the oxidative active substances induced by yellow phosphorus from phosphorus sludge, and summarizes the synergistic promotion mechanism of SO2 and NO x removal by the interaction between sulfur and nitrogen species. Furthermore, given current problems, this review points out the future research should focus on the mechanism of oxidative active substances excited by yellow phosphorus in water, the design of denitrification reactors, and the recovery of low concentration mixed acid after the reaction.

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Research on red mud-limestone modified desulfurization mechanism and engineering application

Cited by 38 publications

References 45 publications

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

A novel method for removing NO_x from simulated marine exhaust gas in wet absorption system using Na₂SO₃/THS composite solution

Recent Advances in Elimination of SO₂ and NO_x from Flue Gas Employing Phosphorus Sludge and Phosphate Rock

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Research on red mud-limestone modified desulfurization mechanism and engineering application

Cited by 38 publications

References 45 publications

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

A novel method for removing NOx from simulated marine exhaust gas in wet absorption system using Na2SO3/THS composite solution

Recent Advances in Elimination of SO2 and NOx from Flue Gas Employing Phosphorus Sludge and Phosphate Rock

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Resources

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A novel method for removing NO_x from simulated marine exhaust gas in wet absorption system using Na₂SO₃/THS composite solution

Recent Advances in Elimination of SO₂ and NO_x from Flue Gas Employing Phosphorus Sludge and Phosphate Rock