A fundamental investigation of the flame kinetics of coal pyrite

Brink, H.M. ten; Eenkhoorn, S.; Hamburg, G.

doi:10.1016/0016-2361(96)00049-x

Cited by 19 publications

(9 citation statements)

References 6 publications

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“…Hollow cenospherical particles have been observed with SEM for pyrite oxidized products. 11 Raask suggested that the formation of cenospherical particles was associated with carbon or silica. 8 As excluded pyrite contains little carbon or silica, the ash particle structure is assumed to be a solid sphere in the current simulation.…”

Section: Discussionmentioning

confidence: 99%

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Fragmentation Behavior of Pyrite and Calcite during High-Temperature Processing and Mathematical Simulation

Gupta

Wall

2001

Energy Fuels

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The fragmentation behavior of pure pyrite and calcite during coal combustion was examined in a laminar drop-tube furnace at 1300 °C. A scanning electron microscope (SEM) and a laser-diffraction particle sizer (Malvern) were used to analyze particle size variation from raw minerals to ash residues. Poisson distribution was used to simulate the particle size variation resulting from the fragmentation of mineral grains. The results for pyrite suggested that a large pyrite grain most likely generated four pieces of fragments, whereas a calcite was most likely expected to produce three segments due to fragmentation. The SEM images of calcite high-temperature residue indicated that the fragmentation of calcite could be more extensive at higher boiler flame temperatures. These simulated results can be used in a comprehensive model of ash formation in pulverized coal combustion.

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Section: Discussionmentioning

confidence: 99%

“…Hollow cenospherical particles have been observed with SEM for pyrite oxidized products . Raask suggested that the formation of cenospherical particles was associated with carbon or silica .…”

Section: Discussionmentioning

confidence: 99%

Fragmentation Behavior of Pyrite and Calcite during High-Temperature Processing and Mathematical Simulation

Gupta

Wall

2001

Energy Fuels

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“…In the present work, thermogravimetric studies described in Section 3.1 seem to indicate that pyrite decomposition in CO 2 atmospheres would produce particles with lower melting points, implying lower viscosity which would involve higher capture rates and increased slagging. The conditions attained with the projection gun are closer to actual pyrite decomposition [24] for two reasons. Firstly, the system ensured decomposition times inside the range of char burnt out times in real combustion [25,26], which are in fact two orders of magnitude faster than in a typical entrained flow reactor.…”

Section: Discussionmentioning

confidence: 80%

Pyrrhotite deposition through thermal projection to simulate iron sulphide slagging in oxyfuel combustion

Mayoral

Andrés

Izquierdo

et al. 2012

Fuel

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a b s t r a c tOxyfuel combustion is envisaged as one of the main options for near future CO 2 reduction in conventional power production. There are many aspects of oxy-combustion still at the research stage. One of those is the issue of boiler materials resistance to corrosion due to solid deposits formed as a consequence of slagging in CO 2 rich flue gases. The novel approach to the issue is the simulation of realistic slagging by pyrite (FeS 2 ) projection through an oxyacetylene spray gun, flying along a controlled flame and impacting onto metallic surfaces of selected composition for fireside waterwall construction (F22, P91, 409, 347, 304H, and 800HT). Metallic surface temperatures were kept at 400, 500, 600 or 700°C, and after deposition, metallic coupons were aged for long periods (150 and 1500 h) at the selected conditions (O 2 /N 2 , CO 2 /N 2 ). The characterisation of deposits was performed with XRD, SEM-EDX and carburisation tests.The first finding is that the oxidation progression is different when partially transformed pyrite covers metallic surfaces. In that case, no iron oxide (Fe 2 O 3 ) scale is generated, only the chromium oxide (Cr 3 O 4 ) grows between the steel and the deposit as a response to oxidation. There is a clear presence of chromium sulphides in competition with the chromium oxide. On the other hand, comparison of scales in CO 2 vs. air indicates the same chemical composition but different morphology; in air combustion, corrosion layers are thicker and cracked. These results can improve the prediction of operational problems in coal oxy-fuel combustion.

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“…The apparatus is based on the laminar flow methane-air flame burner used by Kramlich et al [16,17] for studying the combustion kinetics of a coal particle. The current burner is made up of a hexagonal honeycomb in which stainless tubes are distributed and inserted to make a bundle of flat flame to initiate a series of combustion processes for a single coal particle and ensure a uniform temperature distribution across the burner.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Examination of flame length for burning pulverized coal in laminar flow reactor

Kim

Chang

et al. 2010

J Mech Sci Technol

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Because there has been a recent increase in the use of low calorific coal compared to standard coal, it is crucial to control the char flame length governing the burning life-time of coal in a coal-fired utility boiler. The main objective of this study is to develop a simplified model that can theoretically predict the flame length for burning coal in a laboratory-scale entrained laminar flow reactor (LFR) system. The char burning behavior was experimentally observed when sub-bituminous pulverized coal was fed into the LFR under burning conditions similar to those in a real boiler: a heating rate of 1000 K/s, an oxygen molar fraction of 7.7 %, and reacting flue gas temperatures ranging from 1500 to 2000 K. By using the theoretical model developed in this study, the effect of particle size on the coal flame length was exclusively addressed. In this model, the effect of particle mass was eliminated to compare with the experimental result performed under a constant mass feeding of coal. Overall, the computed results for the coal flame length were in good agreement with the experimental data, particularly when the external oxygen diffusion effect was considered in the model.

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A fundamental investigation of the flame kinetics of coal pyrite

Cited by 19 publications

References 6 publications

Fragmentation Behavior of Pyrite and Calcite during High-Temperature Processing and Mathematical Simulation

Fragmentation Behavior of Pyrite and Calcite during High-Temperature Processing and Mathematical Simulation

Pyrrhotite deposition through thermal projection to simulate iron sulphide slagging in oxyfuel combustion

Examination of flame length for burning pulverized coal in laminar flow reactor

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