Evaluation of reaction mechanism of coal–metal oxide interactions in chemical-looping combustion

Siriwardane, Ranjani; Tian, Hongkun; Miller, Duane D.; Richards, George; Simonyi, Thomas; Poston, James A.

doi:10.1016/j.combustflame.2010.06.008

Cited by 86 publications

(55 citation statements)

References 31 publications

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“…The direct solid-solid reaction between char and oxygen-carrier has been observed in TGA apparatus using Cu-, Ni-, Mn-, Fe-and Co-based oxygen-carriers [227,229,306,307]. However, the solid-solid reaction could be disguised when a gasifying agent is used as fluidization gas, which is the case for CLC.…”

Section: Coal Conversion In the Fuel-reactormentioning

confidence: 99%

Progress in Chemical-Looping Combustion and Reforming technologies

Adánez

Abad

Garcı́a-Labiano

et al. 2012

Progress in Energy and Combustion Science

1,922

1,614

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This work is a comprehensive review of the Chemical-Looping Combustion (CLC) and Chemical-Looping Reforming (CLR) processes reporting the main advances in these technologies up to 2010. These processes are based on the transfer of the oxygen from air to the fuel by means of a solid oxygen-carrier avoiding direct contact between fuel and air for different final purposes. CLC has arisen during last years as a very promising combustion technology for power plants and industrial applications with inherent CO 2 capture which avoids the energetic penalty present in other competing technologies.CLR uses the chemical looping cycles for H 2 production with additional advantages if CO 2 capture is also considered.The review compiles the main milestones reached during last years in the development of these technologies regarding the use of gaseous or solid fuels, the oxygen-carrier development, the continuous operation experience, and modelling at several scales. Up to 2010, more than 700 different materials based on Ni, Cu, Fe, Mn, Co, as well as other mixed oxides and low cost materials, have been compiled. Especial emphasis has been done in those oxygen-carriers tested under continuous operation in Chemical-Looping 2 prototypes. The total time of operational experience (≈ 3500 h) in different CLC units in the size range 0.3-120 kW th , has allowed to demonstrate the technology and to gain in maturity. To help in the design, optimization, and scale-up of the CLC process, modelling work is also reviewed. Different levels of modelling have been accomplished, including fundamentals of the gas-solid reactions in the oxygen-carriers, modelling of the air-and fuel-reactors, and integration of the CLC systems in the power plant. Considering the great advances reached up to date in a very short period of time, it can be said that CLC and CLR are very promising technologies within the framework of the CO 2 capture options.

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Section: Coal Conversion In the Fuel-reactormentioning

confidence: 99%

Progress in Chemical-Looping Combustion and Reforming technologies

Adánez

Abad

Garcı́a-Labiano

et al. 2012

Progress in Energy and Combustion Science

1,922

1,614

View full text Add to dashboard Cite

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“…The feasibility of gasifying the solid fuel in situ in the presence of OC in the FR has been well investigated using TGA or laboratory reactors in the past few years (Rubel et al, 2009;Xiao et al, 2010a,b;Dennis et al, 2010;Stainton et al, in press;Siriwardane et al, 2010). However, up to now, only few continuous reactor systems have been successfully operated.…”

Section: Introductionmentioning

confidence: 97%

Pressurized chemical-looping combustion of coal using an iron ore as oxygen carrier in a pilot-scale unit

Xiao

Chen

Saha

et al. 2012

International Journal of Greenhouse Gas Control

133

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“…Other CLC applications of copper carriers with solid fuels involve: -the study of the reaction of two bituminous coals (Taldinskaya, Russia and US Illinois No. 5, USA) and a lignite (Hambach, Germany) in a batch fluidized bed reactor with cycling of gas composition and of the oxygen carrier between Cu and Cu 2 O has been reported for a reactor temperature of 930°C, with high rates of reaction observed for the lignite but incomplete combustion of the bituminous coals [21], and; -a TGA study of packed carbonaceous fuels and CuO that demonstrated very fast reactions at relatively low temperatures of 500 to 700°C apparently as a consequence of solid-solid reactions [22,23].…”

Section: Introductionmentioning

confidence: 99%

Chemical Looping with Copper Oxide as Carrier and Coal as Fuel

Eyring

Konya

Lighty

et al. 2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

104

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Résumé -Boucle chimique pour la combustion du charbon avec un transporteur d'oxygène à base d'oxyde de cuivre -Une analyse préliminaire a été conduite pour estimer les performances d'un procédé en boucle chimique découplé (CLOU, chemical looping uncoupling) pour la combustion du charbon avec un transporteur d'oxygène à base d'oxyde de cuivre. Les avantages de ce système sont démontrés en établissant le bilan énergétique, l'inventaire et le débit de circulation du matériau transportant l'oxygène, les taux de conversion du carbone et la pression partielle en oxygène dans le réacteur de combustion. Pour faire cette analyse, des données expérimentales de cyclage CuO/Cu 2 O ont été utilisées afin de déterminer les cinétiques de décomposition et d'oxydation du matériau. Elles ont été obtenues avec un oxyde non supporté. La cinétique de décomposition est très rapide à 950°C dans les conditions du réacteur de combustion. Il est montré que la cinétique d'oxydation est maximale au voisinage de 800°C, la vitesse décroissant ensuite pour des températures plus élevées, à cause de résistances diffusionnelles liées à la formation d'une couche de CuO entourant le Cu 2 O. L'analyse montre que le CLOU permet une combustion rapide du carbone, les temps de combustion du carbone étant plus lents que les temps de décomposition du transporteur d'oxygène. Pour confirmer le potentiel du procédé, des données cinétiques additionnelles sont nécessaires sur des oxydes supportés à haute température (>850°C), dans les conditions du réacteur de combustion permettant la libération d'oxygène par l'oxyde de cuivre. Abstract -Chemical Looping with Copper Oxide as Carrier and Coal as Fuel -A preliminary analysis has been conducted of the performance of a Chemical Looping system with Oxygen Uncoupling (CLOU) with copper oxide as the oxygen carrier and coal approximated by carbon as the fuel. The advantages of oxygen uncoupling are demonstrated by providing the energy balances

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Evaluation of reaction mechanism of coal–metal oxide interactions in chemical-looping combustion

Cited by 86 publications

References 31 publications

Progress in Chemical-Looping Combustion and Reforming technologies

Progress in Chemical-Looping Combustion and Reforming technologies

Pressurized chemical-looping combustion of coal using an iron ore as oxygen carrier in a pilot-scale unit

Chemical Looping with Copper Oxide as Carrier and Coal as Fuel

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