Burning velocities of multicomponent organic fuel mixtures derived from various coals

Cho, Sung-Hwan; Marlow, D.; Niksa, Stephen

doi:10.1016/0010-2180(94)00222-e

Cited by 10 publications

(3 citation statements)

References 17 publications

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“…The nitrogen species, HCN and NH 3 , are also released. These results are in close agreement with other experimental results presented in the literature [13][14][15][16][17]45,46]. It should be noted here that no NO is released during the pyrolysis.…”

Section: Released Speciessupporting

confidence: 93%

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NO reduction capacity of four major solid fuels in reburning conditions – Experiments and modeling

Cancès

Commandré²,

Salvador³

et al. 2008

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The combustion of solid fuels in the rotary kiln and in the calciner of a cement plant generates fuel and thermal NO. This NO can be reduced inside the reducing zone of the calciner. This occurs in two different ways: homogeneous reduction by hydrocarbons and heterogeneous reduction by char. The purpose of this paper is to identify the relative contribution of volatile matters or char on the NO reduction process, which largely depends on the nature of the solid fuel used for reburning. Experiments were undertaken in an Entrained Flow Reactor (EFR), at three temperatures: 800, 900 and 1000°C. Four major fuels used in the cement production process were studied: a lignite, a coal, an anthracite and a petcoke. Specific experiments were undertaken to determine (i) their devolatilisation kinetics and the gas species released. A wide range of species influencing the NO chemistry was carefully analyzed. Then, (ii) the char oxidation and (iii) the char NO reduction kinetics were characterized. Finally, (iv), the ''global'' NO reduction capability of each fuel was quantified through experiments during which all phenomena could occur together. This corresponds to the situation of an industrial reactor in reducing conditions. Anthracite and petcoke reduce only very small quantities of NO whereas lignite and coal reduce, respectively, 90% and 80% of the initially present 880 ppm of NO (at 1000°C after 2 s). The four types of experiments described above were then modeled using a single particle thermo-chemical model that includes heterogeneous reactions and detailed chemistry in the gas phase. This model reveals that both NO reduction on char and NO reduction by volatiles mechanisms contribute significantly to the global NO reduction. After short residence times (several tenth of a second), gas phase reactions reduce NO efficiently; after long residence times (several seconds) the char reduces larger quantities of NO.

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Section: Released Speciessupporting

confidence: 93%

“…When pulverized coal is injected, devolatilisation occurs, releasing a large variety of gaseous species. Those species are mainly CO, CO 2 , H 2 , CH 4 and other aliphatic or cyclic hydrocarbons, widely studied in the literature [13][14][15][16][17][18]. Nitrogen species, HCN and NH 3 [10,19,20], or SO 2 [2] are also released.…”

Section: Introductionmentioning

confidence: 99%

NO reduction capacity of four major solid fuels in reburning conditions – Experiments and modeling

Cancès

Commandré²,

Salvador³

et al. 2008

Fuel

View full text Add to dashboard Cite

show abstract

“…The abundance of soot, CO, and combustion products in the secondary products ensures that they will burn relatively slowly (Marlow et al, 1992;Cho et al, 1995). Soot and CO may not even compete effectively for the available O 2 with the reactive chars from low-rank coals (Niksa and Cho, 1998).…”

Section: Primary Devolatilizationmentioning

confidence: 99%

DEVELOPMENT OF A VALIDATED MODEL FOR USE IN MINIMIZING NOx EMISSIONS AND MAXIMIZING CARBON UTILIZATION WHEN CO-FIRING BIOMASS WITH COAL

Felix¹,

Bush²

2002

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Elementary reaction models and correlations for burning velocities of multicomponent organic fuel mixtures

Cho

Niksa

1995

Combustion and Flame

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Burning velocities of multicomponent organic fuel mixtures derived from various coals

Cited by 10 publications

References 17 publications

NO reduction capacity of four major solid fuels in reburning conditions – Experiments and modeling

NO reduction capacity of four major solid fuels in reburning conditions – Experiments and modeling

DEVELOPMENT OF A VALIDATED MODEL FOR USE IN MINIMIZING NOx EMISSIONS AND MAXIMIZING CARBON UTILIZATION WHEN CO-FIRING BIOMASS WITH COAL

Elementary reaction models and correlations for burning velocities of multicomponent organic fuel mixtures

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