The influence of rank and maceral composition on ignition and char burnout of pulverized coal

Oka, N.; Murayama, Toshihiro; Matsuoka, Hideichi; Yamada, Shoichiro; Yamada, Toru; Shinozaki, Sadayuki; Shibaoka, Michio; Thomas, C.G.

doi:10.1016/0378-3820(87)90046-4

Cited by 79 publications

(25 citation statements)

References 2 publications

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“…The role of different petrographic components on the combustion behaviour has been long acknowledged and numerous research efforts have been made in this direction (Jones et al, 1985;Oka et al, 1987;Crelling et al, 1988;Furimsky et al, 1990;Cloke and Lester, 1994;Chaudhuri et al, 1999Chaudhuri et al, -2000. The inertinites, once considered to be less reactive, have also shown good burning characteristics, particularly for the highinertinite Gondwana coals.…”

Section: Introductionmentioning

confidence: 99%

Influence of rank and macerals on the burnout behaviour of pulverized Indian coal

Choudhury

Biswas

Sarkar

et al. 2008

International Journal of Coal Geology

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Section: Introductionmentioning

confidence: 99%

Influence of rank and macerals on the burnout behaviour of pulverized Indian coal

Choudhury

Biswas

Sarkar

et al. 2008

International Journal of Coal Geology

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“…In general a higher fuel ratio corresponds to poorer carbon burnout, which may, however, have little to do with ignition directly, as has been noted in Reference. 6 Furthermore, in this work, the Fuel Ratio is 1.20 for the Utah Coal and 1.23 for the Illinois coal, which are the same to within 3%, hardly a significant difference. Therefore, differences in axial coal jet ignition observed here cannot be attributed to differences in VM (as obtained from Proximate Matter) or differences in FR, as has been suggested in the literature.…”

Section: Discussionmentioning

confidence: 81%

The Effect of Coal Composition on Ignition and Flame Stability in Coaxial Oxy-Fuel Turbulent Diffusion Flames

et al. 2013

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The purpose of the research reported here is to explore how minor coal composition changes can affect oxy-coal flame ignition. Whereas previous work focused on the stability of coaxial turbulent diffusion flames for a single coal, we explore here how two coals of similar rank, fired under aerodynamically identical input conditions, may show very different flame stability characteristics. Since oxy-coal combustion allows oxygen contents in primary and secondary oxidant streams to be varied, flame stability characteristics were determined here by effects of partial pressure of oxygen (P O 2 ) in the primary stream (with differing preheat temperatures in the secondary stream) and effects of P O 2 in the secondary stream (with zero O 2 in the primary stream), on the flame stand-off distance. The two coals investigated were a Utah Skyline bituminous coal and an Illinois #6 bituminous coal. Flame stability was quantified by probability density functions (PDF) of the flame stand-off distance, which were determined using photoimaging techniques developed in previous work. The location of ignition is defined here as the onset of the luminous zone of the flame since that is what an operator in the field might use to control flame stability. At a 420°C preheat temperature, the Illinois coal showed a more stable flame compared to that of the Utah coal. However, the flame stability of the Illinois coal was not significantly changed by increases in secondary oxidant inlet temperature, while that of the Utah coal was. Both coals were bituminous and had similar proximate and ultimate analyses. However, the variations in the results could be interpreted in the light of TGA analysis and solid state 13 C NMR analyses, since these suggested that the observed ignition differences between the two turbulent combusting coal jets might be explained through differences in the fundamental structure of these two coals, as well as differences in their pyrolysis behaviors. Thus, subtle differences in the fundamental chemistry of coals can play important roles in the stability of complicated turbulent diffusion flames, and this may have implications on coal ignition mechanisms in practical turbulent coal flames.

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“…Diffusion of oxygen to, and within, a char particle depends on its physical structure and accessible surface area (char morphology). Attempts have been made to explain the combustion rates of chars in terms of their morphologies (50)(51)(52).…”

Section: Fundamentals Of Heterogeneous Combustion the Discussionmentioning

confidence: 99%

“…equipment availability should be high and maintenance costs low(49)(50)(51).3.1. Combustion of Gaseous Fuels.…”

mentioning

confidence: 99%

Combustion Science and Technology

Sharifi

Pisupati

Scaroni

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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In the introductory section, some of the fundamental concepts and theories of combustion science such as higher heating value of fuel, air to fuel ratio, flammability limits, ignition, and flame temperature are discussed. Premixed and diffusion flames are then defined and some guidelines for their analysis and understanding are outlined. Finally, the fundamentals of coal combustion are discussed. Then the technology involved in the combustion of the three most common types of fossil fuels, namely gas, oil, and coal, is discussed along with some design parameters for the combustion chambers. The most recent advances in fossil fuel combustion technology are pointed out and some of the associated problems with each fuel are explained. Finally, the impact of fossil fuels on the environment and some of the techniques available for reducing their impact are pointed out.

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The influence of rank and maceral composition on ignition and char burnout of pulverized coal

Cited by 79 publications

References 2 publications

Influence of rank and macerals on the burnout behaviour of pulverized Indian coal

Influence of rank and macerals on the burnout behaviour of pulverized Indian coal

The Effect of Coal Composition on Ignition and Flame Stability in Coaxial Oxy-Fuel Turbulent Diffusion Flames

Combustion Science and Technology

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