A kinetic study of the high temperature NO–char reaction

Schönenbeck, C.; Gadiou, Roger; Schwartz, Dominique

doi:10.1016/j.fuel.2003.08.007

Cited by 43 publications

(30 citation statements)

References 26 publications

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“…The presence of catalytic metal matter catalyzes the NO-carbon reaction both by increasing the number of active sites and/or the turnover rate on these sites as well as by significantly decreasing the activation energy [11]. The obtained activation energies (126.9 and 125.4 kJ/mol) are in good agreement with other data presented in literature [9,14,15]. This indicates that as a simple and rapid method, TGA can be an available tool to characterize the kinetics of the NO-char reaction.…”

Section: Pore Structure Model Analysissupporting

confidence: 88%

“…Schonenbeck at al. [14] studied the heterogeneous reaction between NO and a coal-char in the temperature range 1,273-1,573 K in a drop tube furnace. The results support the assumption of first-order reaction with respect to NO concentration and surface area of char, and the activation energy is determined by combination of experiment and CFD simulation.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic analysis of NO-Char reaction

Sun

Zhang

et al. 2009

Korean J. Chem. Eng.

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Two Chinese coals were used to prepare chars in a flat flame flow reactor which can simulate the temperature and gas composition of a real pulverized coal combustion environment. Acid treatment on the YB and SH chars was applied to obtain demineralized chars. Kinetic characterization of NO-char reaction was performed by isothermal thermogravimetry in the temperature range of 973-1,573 K. Presence of catalytic metal matter can increase the reactivity of chars with NO, which indicates that the catalytic effects of inherent mineral matter play a significant role in the NO-char reaction. The discrete random pore model was applied to describe the NO-char reactions and obtain the intrinsic kinetics. The model can predict the data for all the chars at various temperatures well, but underestimate the reaction rates at high carbon conversions for the raw YB and SH chars, which can be attributed to the accumulation of metal catalyst on char surface.

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Section: Pore Structure Model Analysissupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Kinetic analysis of NO-Char reaction

Sun

Zhang

et al. 2009

Korean J. Chem. Eng.

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“…In order to estimate fuels NO x , additional transport equations are required for the following gaseous components:: HCN, NH 3 , and N 2 O [17]. The formation of thermal NO x is described by a group of hightemperature chemical reactions, so-called extended Zeldovich mechanism [18].…”

Section: Modeling the Nox Formation Processmentioning

confidence: 99%

Influence of calcination process on the formation of selected air pollutants

et al. 2017

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Abstract. The subject of the study is to analyze the phenomena of thermal flow in the precalcinator chamber of the exchanger's furnace tower including the combustion of coal dust and decarbonisation of raw lime powder. During the research were provided development of a mathematical model of particulate solid fuels combustion, calcining the raw material, NO x and CO x formation. Moreover conducting the number for the current and the upgraded design of the precalcinator and analysis of the results. In this study, a mathematical model based on Euler's method to describe the motion of the gas phase and the Lagrange method to describe the motion of particles [1][2][3][4]. In the calculations there were assumed fractional particles raw material and fuel, and the following processes: flow of exhaust gases from the rotary kiln through the precalcinator chamber, heat exchange between the particles of raw material and exhaust gases, the additional fuel combustion in the precalcinator, the process of raw material calcination, transformation of gaseous substances, effect of the additional (tertiary) air delivery on the processes in the chamber.

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“…Other studies have focused on the second half of the coal combustion, the char combustion region [14,15]. While studies on NO x reduction by char [16][17][18][19] have been made, the contribution for total NO x emission from the pulverized coal combustion was not clear. In previous studies, we proposed a NO x reaction model which focused on the gas phase reaction in the char combustion region [5,15].…”

Section: Introductionmentioning

confidence: 99%

Application of the NOx Reaction Model for Development of Low-NOx Combustion Technology for Pulverized Coals by Using the Gas Phase Stoichiometric Ratio Index

Taniguchi¹,

Kamikawa²,

Shibata³

et al. 2011

Energies

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Abstract:We previously proposed the gas phase stoichiometric ratio (SRgas) as an index to evaluate NO x concentration in fuel-rich flames. The SRgas index was defined as the amount of fuel required for stoichiometric combustion/amount of gasified fuel, where the amount of gasified fuel was the amount of fuel which had been released to the gas phase by pyrolysis, oxidation and gasification reactions. In the present study we found that SRgas was a good index to consider the gas phase reaction mechanism in fuel-rich pulverized coal flames. When SRgas < 1.0, NO x concentration was strongly influenced by the SRgas value. NO x concentration was also calculated by using a reaction model. The model was verified for various coals, particle diameters, reaction times, and initial oxygen concentrations. The most important reactions were gas phase NO x reduction reactions by hydrocarbons. The hydrocarbon concentration was estimated based on SRgas. We also investigated the ratio as an index to develop a new low-NO x combustion technology for pulverized coals. We examined the relation between local SRgas distribution in the fuel-rich region in the low-NO x flame and NO x emissions at the furnace exit, by varying burner structures. The relationship between local SRgas value and local NO x concentration was also examined. When a low-NO x type burner was used, the value of SRgas in the flame was readily decreased. When the local SRgas value was the same, it was difficult to influence the local OPEN ACCESSEnergies 2011, 4 546 NO x concentration by changing the burner structure. For staged combustion, the most important item was to design the burner structure and arrangement so that SRgas could be lowered as much as possible just before mixing with staged air.

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A kinetic study of the high temperature NO–char reaction

Cited by 43 publications

References 26 publications

Kinetic analysis of NO-Char reaction

Kinetic analysis of NO-Char reaction

Influence of calcination process on the formation of selected air pollutants

Application of the NOx Reaction Model for Development of Low-NOx Combustion Technology for Pulverized Coals by Using the Gas Phase Stoichiometric Ratio Index

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