Gaseous state oxygen carrier for coal chemical looping process

Zhang, Quan; Rakhshi, Aalia; Dasgupta, Debalina; Wiltowski, Tomasz

doi:10.1016/j.fuel.2017.04.062

Cited by 14 publications

(4 citation statements)

References 71 publications

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“…Combustion is a significant contribution to over two-thirds of global CO 2 emission, and thus results in serious greenhouse effect. 1 As suggested by the International Energy Agency (IEA), chemical looping combustion (CLC) is a promising technology, which can offer the potential of providing a concentrated stream of CO 2 without consuming extra energy. 2 The CLC process consists of a fuel reactor and an air reactor.…”

Section: Introductionmentioning

confidence: 99%

“…The reduced OC is then transferred to the air reactor for regeneration. 1 This redox operation avoids direct contact between the fuel and the air, thus reducing the N 2 dilution in the combustion products. The product gases from the fuel reactor contain only CO 2 and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

“…The continuous rapid development of the world economy depends on the massive combustion of fossil fuels to meet the energy requirements. Combustion is a significant contribution to over two-thirds of global CO 2 emission, and thus results in serious greenhouse effect . As suggested by the International Energy Agency (IEA), chemical looping combustion (CLC) is a promising technology, which can offer the potential of providing a concentrated stream of CO 2 without consuming extra energy .…”

Section: Introductionmentioning

confidence: 99%

“…In the fuel reactor, lattice oxygen in the OC is used to fully oxidize a carbonaceous fuel, which produces CO 2 and H 2 O. The reduced OC is then transferred to the air reactor for regeneration . This redox operation avoids direct contact between the fuel and the air, thus reducing the N 2 dilution in the combustion products.…”

Section: Introductionmentioning

confidence: 99%

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High Iron and Calcium Coal Ash As the Oxygen Carrier for Chemical Looping Combustion

Lin

Liu

Jin

et al. 2018

Ind. Eng. Chem. Res.

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The potential of Zhundong’s coal ash as a novel oxygen carrier (OC) in chemical-looping combustion (CLC) was evaluated in a thermogravimetric analysis (TGA) under both the CO/Ar and air atmospheres. A single reduction–oxidation cycle was carried out in the TGA reactor to determine the optimum reaction temperature, which was 1123 K. The cyclic stability and agglomeration tendency of ash also was evaluated by consecutive redox cycles. On the basis of the kinetic analysis, the apparent activation energy of ash was about 26–29 kJ/mol and the reduction process of ash was divided into three stages. The reaction control steps for these stages were gas diffusion, diffusion and kinetics, and kinetics, respectively. Besides, the reactions in the first and second stages corresponded to the reduction of Fe2O3 to Fe and CaSO4 to CaS. In the third stage, the reaction occurred between the CaS and CaSO4.The products of the equilibrium reaction between CO and ash were obtained using Factsage (software), while the transition products from the reduction of ash were determined by X-ray diffraction (XRD). The main reactants in ash were Fe2O3 and CaSO4. Because of sintering and particle agglomeration, the actual percentage of oxygen release (22%) was less than the theoretical value (26%). In addition, after some reactions CaSO4 was converted to MgOCa3O3Si2O4.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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