Experiments on chemical looping combustion of coal with a NiO based oxygen carrier

Shen, Laihong; Wu, Jiahua; Xiao, Jun

doi:10.1016/j.combustflame.2008.08.004

Cited by 182 publications

(144 citation statements)

References 16 publications

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“…Similar amounts of unconverted gases from volatiles have been detected using ilmenite [206,304] or a highly Ni-based oxygen-carrier [185,187]. Unconverted gases were mainly H 2 , CO and some CH 4 , with tars being fully converted by the oxygen-carrier [118,206].…”

Section: In-situ Gasification Chemical-looping Combustion (Ig-clc)mentioning

confidence: 53%

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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

1,917

1,602

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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: In-situ Gasification Chemical-looping Combustion (Ig-clc)mentioning

confidence: 53%

“…Most of the works demonstrating the iG-CLC technology have been carried out using two interconnected fluidized-bed reactors [54,187,206]. Another alternative is to use a batch of an appropriate oxygencarrier in a single fluidized bed with three stages [118,119].…”

Section: In-situ Gasification Chemical-looping Combustion (Ig-clc)mentioning

confidence: 99%

Progress in Chemical-Looping Combustion and Reforming technologies

Adánez

Abad

Garcı́a-Labiano

et al. 2012

Progress in Energy and Combustion Science

1,917

1,602

View full text Add to dashboard Cite

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“…In previous CLC experiments with solid fuels performed to date, full oxidation of the outlet fuel reactor stream could not be achieved [8][9][10][11][12][13][14][15][16][17]. Furthermore, the extent of unburt gases was similar as if a highly Ni-based oxygen carrier was used [14][15][16].…”

Section: Solid Fuelmentioning

confidence: 99%

“…Furthermore, the extent of unburt gases was similar as if a highly Ni-based oxygen carrier was used [14][15][16]. Therefore, in order to oxidize completely unburnt compounds to CO 2 and H 2 O and enhance combustion, an oxygen polishing step downstream was proposed, that is, injection of pure oxygen to the gas flow after the fuel reactor cyclone [8,9], with the corresponding oxygen demand.…”

Section: Solid Fuelmentioning

confidence: 99%

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Relevance of the coal rank on the performance of the in situ gasification chemical-looping combustion

Cuadrat

Abad

Gayán

et al. 2012

Chemical Engineering Journal

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In this work the CLC process for solid fuels using ilmenite as oxygen carrier was evaluated in a continuous CLC unit. In this process, gasification of solid fuel happens in the fuel reactor which is fluidized by a gasifying agent, i.e, H 2 O. This process has been referred as in-situ Gasification CLC, iG-CLC. The feasibility of using fuels ranging from lignite to anthracite and the effect of the coal rank on the process performance was evaluated. The carbon capture efficiency followed the trend of the coal rank, as it was higher for lignite, then for the bituminous coals and it was lower for anthracite. Special attention was put on the combustion of the volatile matter of the different fuels. In all cases oxygen demands lower than 10% were found; for anthracite the oxygen demand values were 3.5% because of the lower volatile content of this fuel. A temperature increase was proven to be advantageous to reach high carbon capture and combustion efficiencies for all the fuels tested. Also, the feasibility of using H 2 O:CO 2 mixtures as gasification agent with each type of fuel was also assessed and it was seen that in case of bituminous coals and lignite some of H 2 O can be replaced by CO 2 .

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