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Iron based oxygen-c...
Iron based oxygen-carrier-aided oxy-fuel combustion of coal char: Reactivity and oxygen transfer mechanism
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- Bu, C. S. (författare)
- Nanjing Normal University
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- Zhao, Xu (författare)
- Nanjing Normal University
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- Leckner, Bo G, 1936 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gómez-Barea, Alberto (författare)
- Universidad de Sevilla,University of Seville
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- Liu, D. Y. (författare)
- Southeast University
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- Meng, Junguang (författare)
- Nanjing Normal University
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- Liu, Changqi (författare)
- Nanjing Normal University
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- Wang, Xinye (författare)
- Nanjing Normal University
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- Zhang, Jubing (författare)
- Nanjing Normal University
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- Piao, Guilin (författare)
- Nanjing Normal University
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(creator_code:org_t)
- Elsevier BV, 2023
- 2023
- Engelska.
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Ingår i: Fuel. - : Elsevier BV. - 0016-2361. ; 333
- Relaterad länk:
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Adding an active oxygen carrier to the inert bed material may favor the oxygen distribution in fluidized bed (FB) combustors. This so-called method “Oxygen-carrier-aided combustion, OCAC” has been applied recently to air combustion in FB boilers, but could also be potentially interesting in oxy-fuel combustion. Here we analyze OCAC in oxy-fuel combustion by experimental determination of the reactivity of char from three coals (lignite, bituminous and anthracite coal) using three oxygen carriers (OC, analytical reagent Fe2O3, hematite, and steel slag). The tests were conducted in a micro thermo-gravimetric analyzer (micro-TGA) and the combustion kinetics was determined for the nine combinations of char and OC. Additional tests were conducted in a macro-TGA i.e., much sample in a big ceramic crucible, to evaluate the phase composition and crystal quality using X-ray diffraction (XRD) to the combustion residues collected at various degrees of carbon conversion (0.2, 0.5, and 0.8). The results show that the burnout temperature decreases with OCs as the combustion rate increases, while the ignition temperature hardly changes. The enhancement of the rate of char combustion by OCs is in the following order: steel slag < hematite < AR-Fe2O3. The lower the fuel rank, the stronger the effect of the oxygen carrier. The combustion kinetics of chars using OC has a higher activation energy and pre-exponential factor than pure char. The enlarged lattice constant of Fe2O3 measured by XRD during the char combustion indicates that the redox reactions of Fe2O3 accelerate the oxidization of char by enhancing the rate of oxygen transport to the carbon surface.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Kemiska processer (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Industriell bioteknik -- Bioenergi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Industrial Biotechnology -- Bioenergy (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Nyckelord
- Oxy-fuel combustion
- Char
- Iron-based oxygen carrier
- Combustion reactivity
- Oxygen transfer
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- Av författaren/redakt...
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Bu, C. S.
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Zhao, Xu
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Leckner, Bo G, 1 ...
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Gómez-Barea, Alb ...
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Liu, D. Y.
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Meng, Junguang
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visa fler...
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Liu, Changqi
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Wang, Xinye
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Zhang, Jubing
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Piao, Guilin
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visa färre...
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Kemiska processe ...
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Industriell biot ...
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och Bioenergi
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Materialteknik
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och Metallurgi och m ...
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Chalmers tekniska högskola