Carbon Stripping – A Critical Process Step in Chemical Looping Combustion of Solid Fuels

Kramp, Marvin; Thon, Andreas; Hartge, Ernst‐Ulrich; Heinrich, Stefan; Werther, Joachim

doi:10.1002/ceat.201100438

Cited by 53 publications

(41 citation statements)

References 46 publications

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“…Based on the different fluidizing properties of remaining char and oxygen-carrier particles, a carbon stripper has been proposed as a promising equipment to carry out the separation of char (Cao and Pan, 2006;Morin et al, 2010). The critical role of the carbon stripper has been pointed out in numerous previous studies (Ströhle et al, 2010;Kramp et al, 2011; submitted for publication-a, submitted for publication-b). In previous CLC experiments with solid fuels performed to date, full oxidation of the outlet fuel-reactor stream could not be achieved Lyngfelt, 2008a,b, 2009;Cuadrat et al, 2011a;Shen et al, 2009a,b,c).…”

Section: Introductionmentioning

confidence: 88%

Effect of operating conditions in Chemical-Looping Combustion of coal in a 500Wth unit

Cuadrat

Abad

Garcı́a-Labiano

et al. 2012

International Journal of Greenhouse Gas Control

100

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a b s t r a c tChemical-Looping Combustion, CLC, is one of the most promising processes to capture CO 2 at low cost. It is based on transferring the oxygen from air to the fuel by using a solid oxygen-carrier that circulates between two interconnected fluidized-bed reactors: the fuel-and the air-reactor.In this work, CLC with coal was investigated in a continuous 500 W th rig using ilmenite as oxygencarrier and Colombian bituminous coal as fuel. In the fuel-reactor the oxygen-carrier is reduced by the volatile matter and coal gasification products.The effect of operating conditions such as the solids circulation rate and oxygen-carrier residence time, the coal flow feed and the steam flow as gasification agent were investigated on the combustion efficiency and extent of gasification. The influence of using CO 2 as gasification agent was assessed by doing experiments with different CO 2 -H 2 O mixtures.The results obtained are valid for the scale-up of a CLC process with coal. They indicate that it is feasible to decrease the gasification agent flow to lower values than the corresponding stoichiometric for the gasification, and that some of the steam as gasification agent can be replaced by CO 2 recirculated from the fuel-reactor outlet. Low circulation rate of solids improved coal conversion.

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Section: Introductionmentioning

confidence: 88%

Effect of operating conditions in Chemical-Looping Combustion of coal in a 500Wth unit

Cuadrat

Abad

Garcı́a-Labiano

et al. 2012

International Journal of Greenhouse Gas Control

100

View full text Add to dashboard Cite

show abstract

“…Kramp, Thon, Hartge, Heinrich, and Werther (2012) developed a process model to investigate the need for carbon stripping in a reactor system based on interconnected fluidized beds. The primary purpose of the carbon stripper would be to separate unconverted char particles from the oxygen-carrier particles in such a way that the char can be transported back to the fuel reactor.…”

Section: Fuel Reactormentioning

confidence: 99%

Chemical-looping combustion of solid fuels

Linderholm

Lyngfelt

2015

Calcium and Chemical Looping Technology for Power Generation and Carbon Dioxide (CO2) Capture

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“…Compared with the traditional combustion technology, chemical‐looping combustion (CLC) technology has many advantages such as inherent CO 2 separation, low reaction temperature, inhibition of thermal NO X formation, and two‐stage reactions to improve system efficiency 1–3. The CLC system includes two interconnected reactors: fuel reactor (FR) and air reactor (AR).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Characterization of an Oleyl‐coated Magnetite Nanoparticle‐Modified Electrode

et al. 2014

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The electrochemical behavior of oleyl‐coated Fe3O4 nanoparticles synthesized by chemical co‐precipitation is investigated. An approach based on the formation of a film of nanoparticles on an electrode surface is employed together with cyclic voltammetry. Characterization by scanning electron microscopy, confocal Raman spectroscopy, and X‐ray photoelectron spectroscopy shows that Fe3O4 nanoparticles with a particle size of 20 nm coated with oleic acid are synthesized. These nanoparticles show superparamagnetic behavior and form a homogeneous film from their solution when dried in air. The nanoparticle film electrodes display redox behavior in acidic media but not in alkaline media, which suggests that protons take part in the electrochemical reaction. It is estimated that there are about 240 layers of nanoparticles deposited on the surface and that only around 1 % of these nanoparticles are electrochemically active. This is attributed to either the long‐chain surfactant or the large number of layers of nanoparticles inhibiting the electron‐transfer process.

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Carbon Stripping – A Critical Process Step in Chemical Looping Combustion of Solid Fuels

Cited by 53 publications

References 46 publications

Effect of operating conditions in Chemical-Looping Combustion of coal in a 500Wth unit

Effect of operating conditions in Chemical-Looping Combustion of coal in a 500Wth unit

Chemical-looping combustion of solid fuels

Electrochemical Characterization of an Oleyl‐coated Magnetite Nanoparticle‐Modified Electrode

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