Selective Non-catalytic Reduction (SNCR) of Nitrogen Oxide Emissions: A Perspective from Numerical Modeling

Locci, Carlo; Vervisch, Luc; Farcy, Benjamin; Domingo, Pascale; Perret, Nicolas

doi:10.1007/s10494-017-9842-x

Cited by 54 publications

(29 citation statements)

References 125 publications

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“…The emission control of nitrogen oxides (NO x ) resulting from fossil fuel combustion has been a major environmental concern related to air quality, as they cause a variety of environmentally harmful effects such as acid rain, photochemical smog, greenhouse effects, and ozone depletion [1][2][3]. At present, several methods have been used for the elimination of NO x , such as plasma catalysis [4,5], selective catalytic reduction (SCR) [6][7][8][9], and selective non-catalytic reduction (SNCR) [10,11]. Therein, selective catalytic reduction of NO x with NH 3 as a reductant is one of the effective techniques to remove NO x and has been commercialized in the post-treatment of flue gases of power plants.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Quasi-MIL-101(Cr) Loaded Ceria Catalysts for the Selective Catalytic Reduction of NOx at Low Temperature

Hou

Wei

et al. 2020

Catalysts

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At present, the development of novel catalysts with high activity Selective Catalytic Reduction (SCR) reaction at the low temperature is still a challenge. In this work, the authors prepare CeO2/quasi-MIL-101 catalysts with various amounts of deposited ceria by a double-solvent method, which are characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and so on. The results show that the increase of Ce content has a great influence on the catalytic property of the catalyst. The introduction of Ce can promote the conversion between Cr3+ and Cr5+ and increase the proportion of lattice oxygen, which improves the activity of the catalyst. However, the catalyst will be peroxidized when the content of Ce is too high, resulting in the decline of the catalytic activity. This experiment indicates that CeO2/quasi-MIL-101 plays a significant role in the NH3-SCR process at the low temperature when the loading of Ce is 0.5%. This work has proved the potential of this kind of material in NH3-SCR process at the low temperature, providing help for subsequent studies.

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Section: Introductionmentioning

confidence: 99%

Preparation of Quasi-MIL-101(Cr) Loaded Ceria Catalysts for the Selective Catalytic Reduction of NOx at Low Temperature

Hou

Wei

et al. 2020

Catalysts

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“…The main principle is that under the condition of catalyst, ammonia, or urea with reductive groups are injected into the flue gas of high temperature furnace was between 850 and 1100 • C. NO x in the flue gas is reduced to harmless nitrogen after atomizing and spraying into the reactor. The advantage of SNCR technology is that there is less investment and occupied area a relatively small, SNCR technology has certain limitations and is generally only suitable for small coal-fired boilers with low NO x content [135]. Since there is no catalyst to accelerate the reaction, the operating temperature is higher than that of SCR method.…”

Section: Selective Noncatalytic Reduction (Sncr) For No X Removalmentioning

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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“…In order to analyze the flow field within SNCR and the NOx reduction reaction process, this paper calculates 13 parameters describing the physical and chemical properties of the 40% methylamine aqueous solution, namely liquid density, liquid viscosity, liquid specific heat, surface tension, liquid thermal conductivity, number of liquid surface layers, liquid diffusion coefficient, latent heat of vaporization, vapour pressure, thermal conductivity of gas, kinetic gas viscosity, gas specific heat (including integral specific heat and differential specific heat). From 1 to 5000K, the critical temperature of the 40% methylamine aqueous solution is 560.30K [8]. At a calculation interval of 10K (liquid) or 100K (gaseous), 13 kinds of physical and chemical parameters are calculated, and then thousands of physical and chemical parameters are input into the Fire V2011 methylamine aqueous solution database.…”

Section: Physical and Chemical Parameter Database Of The Methylamine mentioning

confidence: 99%

“…At a calculation interval of 10K (liquid) or 100K (gaseous), 13 kinds of physical and chemical parameters are calculated, and then thousands of physical and chemical parameters are input into the Fire V2011 methylamine aqueous solution database. For details, please see reference [8].…”

Section: Physical and Chemical Parameter Database Of The Methylamine mentioning

confidence: 99%

Research on selective non-catalytic NOx reduction (SNCR) for diesel engine

Zheng¹,

Zhang²,

Shi³

2018

IJHT

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This paper proposes a selective non-catalytic reduction (NOx) system for diesel engine with 40% methylamine (CH3NH2) aqueous solution as the reducing agent, and carries out an engine bench test. According to the results, CH3NH2 began to separate NH2 out at the exhaust temperature of 250~300℃, the NOx reduction rate of the SNCR system increased rapidly with the increase of the engine load and it reached 70% at the exhaust temperature of 470℃. On this basis, this paper establishes a database containing 13 kinds of physical parameters of methylamine, uses CHEMKIN to establish the reduction process of the gas phase chemical reaction mechanism and imports the file into the general CFD software FireV2011 to numerically simulate the reduction process of the SNCR system. The results indicate that NOx is fully reduced in one rreaction cycle starting from the injection of the reducing agent.

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Selective Non-catalytic Reduction (SNCR) of Nitrogen Oxide Emissions: A Perspective from Numerical Modeling

Cited by 54 publications

References 125 publications

Preparation of Quasi-MIL-101(Cr) Loaded Ceria Catalysts for the Selective Catalytic Reduction of NOx at Low Temperature

Preparation of Quasi-MIL-101(Cr) Loaded Ceria Catalysts for the Selective Catalytic Reduction of NOx at Low Temperature

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

Research on selective non-catalytic NOx reduction (SNCR) for diesel engine

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