Removal of nitric oxide from flue gas using novel microwave-activated double oxidants system

Wang, Yan; Liu, Yangxian; Shi, Shuo

doi:10.1016/j.cej.2020.124754

Cited by 62 publications

(32 citation statements)

References 81 publications

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“…In addition, various pollutants such as sulfur dioxide, nitrogen oxides, and the heavy metal mercury are produced in the process of fossil fuel and waste incineration 64–68. Among them, mercury is one of the most harmful pollutants because of its migration, bioaccumulation, and high toxicity 69, 70.…”

Section: Resultsmentioning

confidence: 99%

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

2021

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A novel H2SO4/H2O2 combining modification was used to modify two kinds of macroalgae (Sargassum and Enteromorpha) biochars to remove gaseous H2S. Desulfurization performance, mechanism, and kinetics of the biochars were studied. The proposed H2SO4/H2O2 combining modification greatly improves the desulfurization performance of biochars. Compared with common adsorbents, the biochars achieve better desulfurization effects. Desulfurization processes follow the pseudo‐first‐order model and external mass transfer is the control step. H2S adsorption over biochars means physical adsorption, while chemical adsorption is auxiliary. H2SO4/H2O2 combining modification improves the desulfurization performance by enhancing the pore structure and increasing O‐containing functional groups.

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Section: Resultsmentioning

confidence: 99%

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

2021

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“…Relevant results ,,,, showed that compared with ultrasonic, photochemical and electrochemical activation, microwave activation had longer radiation distance because it can even penetrate solids, possessing a good prospect of application. In the field of water treatment, some researchers employed microwave to activate peroxides (i.e., H 2 O 2 , PS, and PMS) to generate free radicals to degrade organic contaminants from wastewater. ,,,,,,,, However, microwave-activated SO 4 • – -based AOTs are not suitable for wastewater treatment because most of the microwave radiation energy will be consumed in heating and evaporation of water, instead of activating oxidants.…”

Section: Progress In So4•–-based Aots For Gaseous Pollutant Removalmentioning

confidence: 99%

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

Liu

Wang

2021

Environ. Sci. Technol.

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105

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Excessive emissions of gaseous pollutants such as SO2, NO x , heavy metals (Hg, As, etc.), H2S, VOCs, etc. have triggered a series of environmental pollution incidents. Sulfate radical (SO4•–)-based advanced oxidation technologies (AOTs) are one of the most promising gaseous pollutants removal technologies because they can not only produce active free radicals with strong oxidation ability to simultaneously degrade most of gaseous pollutants, but also their reaction processes are environmentally friendly. However, so far, the special review focusing on gaseous pollutants removal using SO4•–-based AOTs is not reported. This review reports the latest advances in removal of gaseous pollutants (e.g., SO2, NO x , Hg, As, H2S, and VOCs) using SO4•–-based AOTs. The performance, mechanism, active species identification and advantages/disadvantages of these removal technologies using SO4•–-based AOTs are reviewed. The existing challenges and further research suggestions are also commented. Results show that SO4•–-based AOTs possess good development potential in gaseous pollutant control field due to simple reagent transportation and storage, low product post-treatment requirements and strong degradation ability of refractory pollutants. Each SO4•–-based AOT possesses its own advantages and disadvantages in terms of removal performance, cost, reliability, and product post-treatment. Low free radical yield, poor removal capacity, unclear removal mechanism/contribution of active species, unreliable technology and high cost are still the main problems in this field. The combined use of multiactivation technologies is one of the promising strategies to overcome these defects since it may make up for the shortcomings of independent technology. In order to improve free radical yield and pollutant removal capacity, enhancement of mass transfer and optimization design of reactor are critical issues. Comprehensive consideration of catalytic materials, removal chemistry, mass transfer and reactor is the promising route to solve these problems. In order to clarify removal mechanism, it is essential to select suitable free radical sacrificial agents, probes and spin trapping agents, which possess high selectivity for target specie, high solubility in water, and little effect on activity of catalyst itself and mass transfer/diffusion parameters. In order to further reduce investment and operating costs, it is necessary to carry out the related studies on simultaneous removal of more gaseous pollutants.

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“…Another issue associated with using ammonia is the high NO x emissions, which are the main precursors of smog and acid rain that are harmful to both the environment as well as human being health [17][18][19]. Hence, a number of analytical, numerical, and experimental studies have been conducted, with the emphasis being placed on reduc [23,24].…”

Section: Introductionmentioning

confidence: 99%

NO emission performance assessment on a perforated plate-implemented premixed ammonia-oxygen micro-combustion system

Cai

Becker

Cao

et al. 2021

Chemical Engineering Journal

101

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The present work examines the NO x emission characteristics of a premixed micro-combustion system with a perforated plate implemented. For this, a three-dimensional (3D) computational model involving a detailed chemical-kinetic mechanism for ammonia-oxygen combustion in the micro-combustor is developed. The model is first validated with the experimental measurements available in the literature before conducting comprehensive analyses. It is found that implementing a perforated plate in the micro-combustion system creates a flow recirculation zone downstream characterized by a low flame temperature and combustion speed. Meanwhile, the conjugate heat transfer between the combustion products and the inner combustor walls is shown to play a key role in the NO generation by relocating the flame in the axial direction and thus changing the chemical reaction rate. Furthermore, the preferential diffusion caused by the variation in the mass diffusivity of different species and the two-dimensionality flow is identified to vary significantly in comparison with the case in the absence of the perforated plate, especially in the vicinity of the recirculation zone. This diffusion effect results in the considerable drop in the N/O atomic ratio, primarily due to the reduction and increase of O 2 and H 2 O, together with less available N 2 , and consequently affecting the NO generation rate. This work confirms that the flow field, the conjugate heat transfer as well as the preferential diffusion effect could be regarded as the potential mechanisms leading to the NO x emission variation in the recirculation zones. Nomenclature 3Dthree-dimensional specific heat of species, CO carbon monoxide CO 2 carbon dioxide CH 4

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Removal of nitric oxide from flue gas using novel microwave-activated double oxidants system

Cited by 62 publications

References 81 publications

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

NO emission performance assessment on a perforated plate-implemented premixed ammonia-oxygen micro-combustion system

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Removal of nitric oxide from flue gas using novel microwave-activated double oxidants system

Cited by 62 publications

References 81 publications

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H2SO4/H2O2

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H2SO4/H2O2

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

NO emission performance assessment on a perforated plate-implemented premixed ammonia-oxygen micro-combustion system

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Product

Resources

About

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂