<i>In situ</i> gasification of a solid fuel and CO<sub>2</sub> separation using chemical looping

Scott, Stuart A.; Dennis, John S.; Hayhurst, A.N.; Brown, T. A.

doi:10.1002/aic.10942

Cited by 175 publications

(150 citation statements)

References 5 publications

Supporting

Mentioning

149

Contrasting

Order By: Relevance

“…In the literature it was found that the temperature in the fuel reactor is one of the parameters with most influence on coal conversion [10,12,16] because of its effect on the gasification rate. Indeed, the gasification step has high influence on the performance of this process [24][25][26][27]. In this work an evaluation of the iG-CLC process performance with different coals was made for increasing fuel reactor temperature.…”

Section: Resultsmentioning

confidence: 99%

“…That is because for all the fuels here used the gasification rate is faster with steam than with CO 2 . Note that there are some fuels whose gasification rate with CO 2 is fast enough so that it is feasible to use CO 2 as gasification agent [25,29,30]. The decrease in the reached char conversion and  CC when gasifying with higher fraction of CO 2 compared to using pure steam is less pronounced for lignite and higher for anthracite.…”

Section: Carbon Capture Efficiency and Char Gasificationmentioning

confidence: 99%

“…The gasification process has been identified as the controlling step in this process [24][25][26][27].…”

Section: Solid Fuelmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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 .

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Carbon Capture Efficiency and Char Gasificationmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…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]. The process would consist of several fluidized-bed reactors operating in parallel and out of phase with one another to achieve a continuous supply of energy.…”

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

confidence: 99%

“…Dennis et al [118,119] have proposed the use of a cycling fed-batch operation for solid fuels in order to reduce the attrition problems associated with the conveying of large quantities of solids in the interconnected fluidized beds configuration. In this operation mode, three consecutive periods of time (fuel feeding, char combustion without fuel feed, and oxygen-carrier regeneration with air) are carried out in only one fluidized reactor.…”

Section: Process Fundamentalsmentioning

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

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.

show abstract