Reactivity study of combustion for coals and their chars in relation to volatile content

Lee, Jongmin; Kim, Dong-Won; Kim, Jae-Sung

doi:10.1007/s11814-009-0086-x

Cited by 14 publications

(5 citation statements)

References 15 publications

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“…Thermogravimetric analysis measures the amount of mass change in a substance as a function of temperature or time under a controlled atmosphere [1,2,[35][36][37]. It is a useful technique for studying thermal behaviour of solid samples during pyrolysis and determining kinetics of the thermal events [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

An investigation of thermal behaviour of biomass and coal during copyrolysis using thermogravimetric analysis

Vhathvarothai

Ness

Qian

2013

Int. J. Energy Res.

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SUMMARYThe biomass, coal and their blends at blending ratios (biomass : coal) of 95:5, 90:10, 85:15 and 80:20 were pyrolysed under a nitrogen environment at four different heating rates comprising 5°C, 10°C, 15°C and 20°C per minute to investigate their pyrolytic behaviour and to determine kinetic parameters of thermal decomposition through Kissinger's corrected kinetic equation using the thermogravimetric analysis results. In the kinetic analysis, the activation energy of both types of biomass was less than that of coal, being 168.7 kJ/mol (cypress wood chips), 164.6 kJ/mol (macadamia nut shells) and 199.6 kJ/mol (Australian bituminous coal). The activation energy of the blends of biomass and coal followed that of the weighted average of the individual samples in the blends. Char production of the samples and the blends was also analysed to observe any synergetic effects and thermal interaction between biomass and coal. The char production of the blends corresponded to the sum of the results for the individual samples with the coefficient of determination of 0.999. Thermal decomposition of biomass and coal appeared to take place independently, and thus, the activation energy of the blends can be calculated from that of the two components. There was no evidence for any significant synergetic effects and thermal interaction between either type of biomass and coal during copyrolysis. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

An investigation of thermal behaviour of biomass and coal during copyrolysis using thermogravimetric analysis

Vhathvarothai

Ness

Qian

2013

Int. J. Energy Res.

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“…Several TGA studies on combustion characteristics and kinetics of biomass and/or coal have been reported [35,36,38,[40][41][42][43][44][45][46]. Gil et al [38] studied thermal characteristics of biomass (pine sawdust), coal and their blends under combustion conditions using non-isothermal TGA.…”

Section: Introductionmentioning

confidence: 99%

“…Thermogravimetric analysis measures the amount of mass change of a sample as a function of increasing temperature under a controlled atmosphere such as nitrogen, air or other gas . It is widely regarded as a useful technique in investigating thermal behaviour of solid samples and blends of solid samples during thermochemical processes .…”

Section: Introductionmentioning

confidence: 99%

An investigation of thermal behaviour of biomass and coal during co-combustion using thermogravimetric analysis (TGA)

Vhathvarothai

Ness

Qian

2013

Int. J. Energy Res.

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SUMMARY The thermal behaviour and kinetic analysis of biomass (cypress wood chips and macadamia nut shells) and Australian bituminous coal during combustion were studies using the thermogravimetric technique with four different heating rates under an air atmosphere. Each type of biomass was blended with coal at mass ratios (biomass:coal) of 95:5, 90:10, 85:15 and 80:20 to investigate the effect of coal as a supplementary fuel on thermal behaviour during the combustion process. Combustion of the individual samples and the blends took place in three steps comprising dehydration, devolatilisation and char oxidation. During co‐combustion, the thermal decomposition behaviour of the blends followed that of the weighted average of the individual samples in the blends. In kinetic analysis, thermal decomposition of biomass and coal appeared to take place independently, and thus, the activation energy of the blends can be calculated from that of the two components. No evidence for any significant synergetic effects or thermal interaction was found between either type of biomass and the coal during co‐combustion based on the lack of deviation from expected behaviour of the blends. Copyright © 2013 John Wiley & Sons, Ltd.

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“…The ignition temperatures of semicoke‐1, semicoke‐2, PCI‐1, and PCI‐2 are consistent with the sequential order of the TG‐DTG curves, which indicates that semicoke‐1 and PCI‐1 ignited more easily. Previous studies 30,31 have shown that the volatile content is an important influencing factor for the ignition temperature. The precipitation of volatiles before the solid fuel reaches the ignition temperature, and the heat released by combustion facilitates the combustion of the fixed carbon, which can improve the overall ignition characteristics of the fuel and the subsequent combustion.…”

Section: Resultsmentioning

confidence: 99%

Comparison of isothermal and nonisothermal combustion methods when evaluating semicoke for pulverized coal injection of blast furnace

Zou

Zhao

et al. 2022

Asia-Pacific J Chem Eng

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Using semicoke instead of anthracite for pulverized coal injection (PCI) in a blast furnace can greatly reduce the cost of iron making, but the combustion performance of semicoke first needs to be accurately predicted. In this study, the combustion performances of different fuels were compared and analyzed in a drop tube furnace (DTF) and under isothermal and nonisothermal conditions. The results showed that semicoke had a better combustion performance than coal in the DTF. Isothermal combustion provided a more consistent performance evaluation of the fuels because the effect of volatiles was eliminated. Nonisothermal combustion significantly differed from the DTF results because of the influence of volatiles; after the fuels received high‐temperature treatment for devolatilization, the combustion performance was consistent with the DTF results. The influencing factors for the fuel combustion performance differed according to the combustion conditions. For the DTF, the burnout rate was correlated with the pore structure and microcrystalline structure, especially the latter. For isothermal combustion, the combustion characteristic parameter and microcrystalline structure d002 and Lc after high‐temperature treatment were strongly correlated. For nonisothermal combustion, the combustion characteristic parameters were strongly correlated with the volatile content. The above results can serve as a reference for evaluating the combustion performance of different fuels in a blast furnace using PCI.

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Reactivity study of combustion for coals and their chars in relation to volatile content

Cited by 14 publications

References 15 publications

An investigation of thermal behaviour of biomass and coal during copyrolysis using thermogravimetric analysis

An investigation of thermal behaviour of biomass and coal during copyrolysis using thermogravimetric analysis

An investigation of thermal behaviour of biomass and coal during co-combustion using thermogravimetric analysis (TGA)

Comparison of isothermal and nonisothermal combustion methods when evaluating semicoke for pulverized coal injection of blast furnace

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