Development of TG measurements of intrinsic char combustion reactivity for industrial and research purposes

Russell, Nigel V.; Beeley, T.J.; Man, Chi Keung; Gibbins, Jon; Williamson, J.

doi:10.1016/s0378-3820(98)00077-0

Cited by 120 publications

(75 citation statements)

References 19 publications

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“…This observation is consistent with previous studies in which a decreased reaction rate or char deactivation was attributed to increased carbon structure ordering and preferential consumption of less ordered carbon as a consequence of thermal/oxidative annealing of carbons. [20][21][22][23][24][25][26]50] The fact that reaction rates decrease with increased burnout is consistent with preferential burnoff of less ordered carbon, but decreased surface area per unit mass could also contribute in decreasing reaction rates. A similar trend was also noted for the other two coals.…”

Section: Dtf Measurementsmentioning

confidence: 89%

“…[1,12] Due to its importance, solid char combustion has been extensively studied in the past. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Char reactivity is controlled by the chemical reaction between char and oxygen and/or pore diffusion of gases in and out of char particle. [15] During combustion, oxygen from the reacting gases is transferred to the outer surface of char and also into the internal pores, followed by adsorption, and initiation of carbon oxidation, and subsequent transportation of product gases away from char.…”

Section: Introductionmentioning

confidence: 99%

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Influence of carbon structure and mineral association of coals on their combustion characteristics for pulverized coal injection (PCI) application

Gupta

Sahajwalla

Al-Omari

et al. 2006

Metall Mater Trans B

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The influence of carbon structure and mineral matter of three pulverized coals on their char characteristics including reactivity was studied under a range of combustion conditions in a drop tube furnace (DTF) and thermogravimetric (TGA) furnace for PCI application. Physical and chemical properties of coals and their combustion derivatives were characterized by automated reflectogram, X-ray diffraction, scanning electron microscope, and BET N 2 adsorption. The QEMSCAN* technique was used *QEMSCAN is a trademark

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Section: Dtf Measurementsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Influence of carbon structure and mineral association of coals on their combustion characteristics for pulverized coal injection (PCI) application

Gupta

Sahajwalla

Al-Omari

et al. 2006

Metall Mater Trans B

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“…Consequently, it is necessary to investigate alterations between sewage sludge combustion and coal combustion. Thermogravimetric analysis (TGA) has been widely used to characterize the thermal process of coal, and more recently, to describe that of sludge, such as ignition and burnout temperature [9,10] . This kind of analysis gives a rapid assessment of the fuel.…”

Section: Introductionmentioning

confidence: 99%

Combustion of sewage sludge as alternative fuel for cement industry

Zhang

2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The combustion of sewage sludge and coal was studied by thermogravimetric analysis. Both differential scanning calorimetric analysis and derivative thermogravimetric profi les showed differences between combustion of sewage sludge and coal, and non-isothermal kinetics analysis method was applied to evaluate the combustion process. Based on Coats-Redfern integral method, some reaction models were tested, the mechanism and kinetics of the combustion reaction were discussed. The results show that the combustion of sewage sludge is mainly in the low temperature stage, meanwhile the ignition temperature and Arrhenius activation energy are lower than that of coal. The combustion of sewage sludge has the advantage over coal in some aspects, thus sewage sludge can partly replace coal used as cement industry fuel.

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“…Whilst thermal techniques have been employed both to measure the reactivity of char to oxygen 3 and to quantitatively determine carbonaceous matter in¯y ashes, 4 there has been little research measuring¯y ash reactivity by determining the transition temperature (T g ) of the glassy phase. Fly ash reactivity is important in diverse applications such as acting as a pozzolan in concrete and for the production of zeolites.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of fly ashes sourced from European non‐blended coals

Stanton¹,

Towler²,

Mooney³

et al. 2002

J of Chemical Tech & Biotech

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Fly ashes exist as a mixture of major amorphous phases and minor crystalline phases. For commercial applications, such as in concretes and for the production of zeolites, it would be desirable to be able to predict the reactivity of¯y ashes. The amorphous phase dominates degradation behaviour, because glasses have a higher potential energy than the equivalent crystal structure and the variation of bond angles and distances in a glass make the bond breakage easier. Despite the large quantities of¯y ash produced annually by coal-burning power plants, there have been very few studies investigating the microstructure and composition of the amorphous component. In particular, there has been little research undertaken in measuring the glass transition temperature (T g ), which can be directly correlated to the chemical reactivity of the glass phase. Thirteen European¯y ashes were used for the present study. Differential scanning calorimetry (DSC) was employed to determine the presence of transition temperatures and any other thermal events (exotherms or endotherms) in the glassy phase of the¯y ashes. Several different but distinct behaviours were evident in the DSC traces with T g values visible for six of the ashes. The results suggest that thermal analysis has potential as a technique for¯y ash characterisation.

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Development of TG measurements of intrinsic char combustion reactivity for industrial and research purposes

Cited by 120 publications

References 19 publications

Influence of carbon structure and mineral association of coals on their combustion characteristics for pulverized coal injection (PCI) application

Influence of carbon structure and mineral association of coals on their combustion characteristics for pulverized coal injection (PCI) application

Combustion of sewage sludge as alternative fuel for cement industry

Thermal analysis of fly ashes sourced from European non‐blended coals

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