Modelling of the Combustion of Single Char Particles

Sotirchos, Stratis V.; Srinivas, B.; Amundson, Neal R.

doi:10.1515/revce.1984.2.3-4.175

Cited by 10 publications

(6 citation statements)

References 37 publications

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“…. These observations agree with the predictions of Sotirchos and Amundson (Sotirehos 1982; Sotirehos and Amundson 1984a; Sotirchos and Amundson 1984b;Sotirchos, Srinivas et al 1984) of the transient combustion behavior of a char particle. When the particle reacts at low conversions it may have low micropore surface area and therefore lie in the unignited branch of the solution locus.…”

Section: Case I: Particles Exhibit Single Ignitionssupporting

confidence: 90%

Pyrolysis and gasification of coal at high temperatures

Zygourakis¹

1988

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Section: Case I: Particles Exhibit Single Ignitionssupporting

confidence: 90%

Pyrolysis and gasification of coal at high temperatures

Zygourakis¹

1988

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“…Their results showed that coal combustion in a mixture of pure oxygen and recycled flue gases, instead of air, could be achieved satisfactorily under the conditions representative of the utility boilers. Sotirchos et al [135] also observed the simultaneous combustion and gasification effect of O 2 /CO 2 [130, 136e138] and modeled the combustion of single char particles. The overall burning rates of char particles (115 mm) were unaffected by carbon dioxide when the oxygen content was 3 and 6 vol% and the gas temperature varied between 1071 and 1234 C in the combustion experiments carried out by Mitchell and Madsen [139] at two concentration levels of CO 2 (2.1 and 8 vol%).…”

Section: Advantages Disadvantagesmentioning

confidence: 99%

Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review

Irfan

Usman

Kusakabe

2011

Energy

428

229

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“…The rate of gasification with CO 2 is small compared to the rate of combustion with O 2 . Modeling of the combustion of single char particles is reviewed by Sotirchos et al, who consider also simultaneous combustion and gasification. Simultaneous combustion (C/O 2 ) and gasification (C/CO 2 ) has been studied by Mitchell and Madsen, Makino and Law, Makino, Shadman and Cavendish, and Wang et al .…”

Section: Introductionmentioning

confidence: 99%

Pressurized Pulverized Fuel Combustion in Different Concentrations of Oxygen and Carbon Dioxide

Saastamoinen¹,

Aho²,

Hämäläinen³

et al. 1996

Energy Fuels

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Theoretical and experimental studies showed that increasing gas pressure at constant gas composition most strongly increases the combustion rate of less reactive coals, which are difficult to burn completely in atmospheric pulverized fuel boilers. The effect of pressure increase is greatest near 0.1 MPa and less at higher pressures. The limit at which increase in pressure has an effect varies from coal to coal, depending on the particle size. With less reactive coals and small particles, the effect can be seen at pressures greater than 1 MPa. The relative effect of pressure increases when the gas oxygen content is low, improving the burnout in furnaces. The effect of pressure is small for large particles and reactive fuels. At high pressures the rates of homogeneous and heterogeneous reactions increase raising the maximum particle temperature; the higher temperature may increase the extent of devolatilization and further decrease the total combustion time. Combustion rate and the temperature of burning coal particles were measured in experiments with a pressurized entrained flow reactor under the following conditions: gas temperature 1073-1473 K, pressure 0.2-0.8 MPa, oxygen partial pressure 0.025-0.1 MPa, and partial pressure of CO 2 0.05-0.2 MPa. Measured and calculated results showed increased carbon dioxide concentration in the combustion environment to have an insignificant effect on the combustion rate in the studied temperature region, but it lowered the particle temperature to some extent, suggesting that the gasification reaction CO 2 -C takes place as well. Calculations indicated that in pressurized combustion the rate of gasification reaction is greater at higher temperatures.

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Modelling of the Combustion of Single Char Particles

Cited by 10 publications

References 37 publications

Pyrolysis and gasification of coal at high temperatures

Pyrolysis and gasification of coal at high temperatures

Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review

Pressurized Pulverized Fuel Combustion in Different Concentrations of Oxygen and Carbon Dioxide

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