Interaction between biomass ash and iron ore oxygen carrier during chemical looping combustion

Gu, Haiming; Shen, Laihong; Zhong, Zhaoping; Zhou, Yuanliang; Liu, Weidong; Niu, Xin; Ge, Huijun; Jiang, Shouxi; Wang, Lulu

doi:10.1016/j.cej.2015.04.105

Cited by 73 publications

(51 citation statements)

References 24 publications

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“…Fe-based oxygen carriers [269,[295][296][297][298]. With coal ash, a low ash load seems to decrease the reactivity of Fe-based oxygen carriers [296]; however, if the ash load increases and the ashes have a high Fe 2 O 3 or CaSO 4 content, an increase in the reactivity of the oxygen carrier is observed, as these components can act as an oxygen carrier [297].…”

Section: Management Of Ash In the Clc Process With Solid Fuelsmentioning

confidence: 99%

“…Preliminary studies on biomass ash indicate the influence of the type of biomass used as fuel. The presence of silica in the ashes can lead to formation of potassium silicates facilitating sintering of iron ore particles, while large amounts of K improves the reactivity of the oxygen carrier [298]. However, more research should be conducted in order to optimize ash handling in a CLC system.…”

Section: Management Of Ash In the Clc Process With Solid Fuelsmentioning

confidence: 99%

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Chemical looping combustion of solid fuels

Adánez

Abad

Mendiara

et al. 2018

Progress in Energy and Combustion Science

487

321

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Chemical Looping Combustion (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 energy penalty imposed on other competing technologies. The use of solid fuels in CLC has been highly developed in the last decade and currently stands at a technical readiness level (TRL) of 6. In this paper, experience gained during CLC operation in continuous units is reviewed and appraised, focusing mainly on technical and environmental issues relating to the use of solid fuels. Up to now, more than 2700 hours of operational experience has been reported in 19 pilot plants ranging from 0.5 kW th to 4 MW th. When designing a CLC unit, the preferred configuration for the scale-up of CLC of solid fuels is a two circulating fluidized beds (CFB) system. Coal has been the most commonly used solid fuel in CLC, but biomass has recently emerged as a very promising option to achieve negative emissions using bioenergy with carbon capture and storage (BECCS). Mostly low cost iron and manganese materials have been used as oxygen carriers in the so called in-situ gasification CLC (iG-CLC). The development of Chemical Looping with oxygen uncoupling (CLOU) makes a qualitative step forward in the solid fuel combustion, due to the use of materials able to release oxygen. The performance and environmental issues of CLC of solid fuels is evaluated here. Regarding environmental aspects, the pollutant emissions (SO 2 , NO x , etc.) released into the atmosphere from the air reactor are no cause of concern for the environment. However, the presence of SO 2 , NO x and Hg at the exit of the fuel reactor affects CO 2 quality, which must be taken into account during the later compression and purification stages. The effect of the main variables affecting CLC performance is evaluated for fuel conversion, CO 2 capture rate, and combustion efficiency obtained in different CLC 3 units. Solid fuel conversion is normally not complete during operation, due to the undesired loss of char. A methodology is presented to extrapolate the current information to what could be expected in a larger CLC system. CO 2 capture near 100% has been reported using a highly efficient carbon stripper, highly reactive fuels (such as lignites and biomass, etc.) or by the CLOU process. Operational experience in iG-CLC has showed that it is not possible to reach complete fuel combustion, making an additional oxygen polishing step necessary. For the further scale-up, it is essential to reduce the unburnt compounds at the fuel reactor outlet. Proposals to achieve this reduction already exist and include both improvement to the gas-oxygen carrier contact, or new design concepts based on the current scheme for iG-CLC. In addition, CLOU based on copper materials has shown that complete fuel combustion could be achieved. Main challenges for the future development and scale-up of CLC technology have been also identified. A breakthrough in the future development of CLC technology for ...

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Section: Management Of Ash In the Clc Process With Solid Fuelsmentioning

confidence: 99%

Section: Management Of Ash In the Clc Process With Solid Fuelsmentioning

confidence: 99%

Chemical looping combustion of solid fuels

Adánez

Abad

Mendiara

et al. 2018

Progress in Energy and Combustion Science

487

321

View full text Add to dashboard Cite

show abstract

“…In addition, the effect of ash formation on the performance of an oxygen carrier cannot be ignored, particularly in the utilization of biomass. Ash with low melting point alkali metals such as Na or K will promote agglomeration of the oxygen carrier [48,49], while high-acid ash (e.g., SiO 2 -rich ash) leads to the production of potassium silicates that facilitate particle sintering, suppressing the fuel conversion and CO 2 capture efficiency [50]. Therefore, the resistance of an oxygen carrier to agglomeration is also a critical factor for its practical application.…”

Section: Materials For Chemical Loopingmentioning

confidence: 99%

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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Combining chemical looping with a traditional fuel conversion process yields a promising technology for low-CO2-emission energy production. Bridged by the cyclic transformation of a looping material (CO2 carrier or oxygen carrier), a chemical looping process is divided into two spatially or temporally separated half-cycles. Firstly, the oxygen carrier material is reduced by fuel, producing power or chemicals. Then, the material is regenerated by an oxidizer. In chemical looping combustion, a separation-ready CO2 stream is produced, which significantly improves the CO2 capture efficiency. In chemical looping reforming, CO2 can be used as an oxidizer, resulting in a novel approach for efficient CO2 utilization through reduction to CO. Recently, the novel process of catalyst-assisted chemical looping was proposed, aiming at maximized CO2 utilization via the achievement of deep reduction of the oxygen carrier in the first half-cycle. It makes use of a bifunctional looping material that combines both catalytic function for efficient fuel conversion and oxygen storage function for redox cycling. For all of these chemical looping technologies, the choice of looping materials is crucial for their industrial application. Therefore, current research is focused on the development of a suitable looping material, which is required to have high redox activity and stability, and good economic and environmental performance. In this review, a series of commonly used metal oxide-based materials are firstly compared as looping material from an industrial-application perspective. The recent advances in the enhancement of the activity and stability of looping materials are discussed. The focus then proceeds to new findings in the development of the bifunctional looping materials employed in the emerging catalyst-assisted chemical looping technology. Among these, the design of core-shell structured Ni-Fe bifunctional nanomaterials shows great potential for catalyst-assisted chemical looping.

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“…Surface morphology of the CuO particles observed due to the interactions between the metal oxygen carrier and ash [40].Sintering of Cu particles observed at 800 0 C during its reaction with syngas obtained from biomass gasification [34]. Fuel conversion rate was significantly influenced by the biomass ash and sintering observed due to the SiO2 rich wheat straw ash (WSA) [43]. Indicating that ash in the CLC process is causing lot of problems like changes in structural changes, reduction in regeneration of OC, less reactivity with fuel etc.…”

Section: Effect Of Biomass On Oxygen Carriersmentioning

confidence: 99%

Chemical looping combustion of biomass for renewable & non- CO2 emissions energy- status and review

Goli¹,

Pundlik²,

Rao³

et al. 2018

IJET

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World depends on fossil fuel combustion for thermal energy generation. Fossil fuel combustion leads to the generation of CO2 and extinction of non-renewable resources. To meet the future energy demands replacement of existing technologies should take place in the view of large quantities of GHG's emissions from fossil fuels and their extinction. Chemical looping combustion (CLC) is primarily a combustion technique with an inherent separation of CO2 from the flue gases. Due to its advantage of negative CO2 emissions, chemical looping combustion got attention of many researchers since last one and half decade. Recent research advancements in the CLC provided a platform for further research and developments in chemical looping combustion of biomass. This paper reviews the CLC of biomass to present the overview of chemical looping combustion technology and its status of biomass utilization as a fuel in CLC reactors.

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Interaction between biomass ash and iron ore oxygen carrier during chemical looping combustion

Cited by 73 publications

References 24 publications

Chemical looping combustion of solid fuels

Chemical looping combustion of solid fuels

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Chemical looping combustion of biomass for renewable & non- CO2 emissions energy- status and review

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