Effect of Ash on Oxygen Carriers for the Application of Chemical Looping Combustion to a High Carbon Char

Rubel, Aurora M.; Zhang, Y.; Liu, K.; Neathery, James K.

doi:10.2516/ogst/2010024

Cited by 36 publications

(30 citation statements)

References 26 publications

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“…In general, no problems were observed with agglomeration or reactivity loss involving ash and carrier particles when the ash concentration was low [186,303]. When the ash content was increased up to values of 20 wt%, an increase in the reactivity was shown using Fe-based oxygen-carriers [318]. However, it was not definitively determined if this increase was due to an activation of the solids, similar to ilmenite, or was due to a synergetic effect of ash.…”

Section: Operational Experience Of Oxygen-carriers For Ig-clcmentioning

confidence: 88%

“…Besides, Gao et al [240] used a mixture of carbon does not proceed at an appreciable rate in the fluidized-bed reactor although high reactivity was found with the gasification products, H 2 and CO. In this line, char was used by Rubel et al [229,318] to evaluate solid CLC without gasification of the solid fuel. They used a TGA to directly oxidize a high carbon coal char in an inert gas, i.e.…”

Section: Operational Experience Of Oxygen-carriers For Ig-clcmentioning

confidence: 99%

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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: Operational Experience Of Oxygen-carriers For Ig-clcmentioning

confidence: 88%

Section: Operational Experience Of Oxygen-carriers For Ig-clcmentioning

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

show abstract

“…Generally, the effect of ash on CLC performance can be ignored or minimized when using small fuel particles or low ash fuels [10,27,28]. However, when the ash content was relatively high, the effect of ash cannot be ignored [29]. Previous investigations have shown that the effect of different ashes on oxygen carrier can vary depending on ash component, ash content, the experimental conditions and the oxygen carrier used [29][30][31][32].…”

Section: Introductionmentioning

confidence: 97%

Sewage sludge combustion in a CLC process using nickel-based oxygen carrier

Niu

Shen

et al. 2015

Chemical Engineering Journal

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“…First, the introduction of high-velocity jet is likely to create strong mixing of solids and gas avoiding loss of reactivity due to the ash agglomeration with the oxygen carrier (Rubel et al 2011). Second, the oxygen carrier particles need to be of a relatively large diameter to be spoutable (Geldart 1973) and the relatively larger particles are likely to lead to easier separation of ash from the recirculating oxygen carrier.…”

Section: Cfd/dem Simulations Using Ansys Fluentmentioning

confidence: 99%

“…It has been identified that char gasification is the bottleneck of the fuel conversion rate in the iG-CLC process ) and agglomerationinduced loss of reactivity can occur when the ash concentration is high (Rubel et al 2011). To address both these concerns, the spouted fluidized bed configuration for the fuel reactor has been proposed for CD-CLC where instead of evenly distributing the gas feeding at the inlet, a high-speed center jet is assigned.…”

Section: Introductionmentioning

confidence: 99%

Process and Reactor Level Simulations of Coal-Direct Chemical-looping Combustion

Agarwal

Banerjee

Zhang

et al. 2014

Novel Combustion Concepts for Sustainable Energy Development

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Reducing carbon emissions from fossil-fueled power plants has been an active area of research in recent years. One technology that appears to be very promising for high-efficiency low-cost carbon capture is chemical-looping combustion (CLC) . CLC involves combustion offuels (either gas or solid) by heterogeneous chemical reactions with an oxygen carrier, usually a particulate metal oxide. Because of the absence of air in the fuel reactor, the combustion products are not diluted by other gases (e.g., N 2 ), resulting in high purity of CO 2 available at the fuel reactor outlet. Also, the net energy release from a CLC process is theoretically identical to that from conventional combustion of the fuel (2001) has shown that the energy cost of solid circulation, which is the only energy cost of separation, is a very small percentage (approximately 0.3 %) of the total energy released by the combustion process compared to other pre-combustion technologies such as the oxy-fuel combustion in which the oxygen separation process consumes nearly 15 % of the electricity generation (Hong et al. 2009a, b). Therefore, CLC holds significant promise as a next-generation combustion technology due to its potential to allow zero CO 2 emission with little effect on the efficiency of the power plant.

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Effect of Ash on Oxygen Carriers for the Application of Chemical Looping Combustion to a High Carbon Char

Cited by 36 publications

References 26 publications

Progress in Chemical-Looping Combustion and Reforming technologies

Progress in Chemical-Looping Combustion and Reforming technologies

Sewage sludge combustion in a CLC process using nickel-based oxygen carrier

Process and Reactor Level Simulations of Coal-Direct Chemical-looping Combustion

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