Batch testing of solid fuels with ilmenite in a 10kWth chemical-looping combustor

Berguerand, Nicolas; Lyngfelt, Anders

doi:10.1016/j.fuel.2010.03.055

Cited by 66 publications

(64 citation statements)

References 23 publications

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“…3 and 4. As described by reaction (3), the gasification of charcoal at 2.5 to 15 mol.% steam may form CO and H 2 , whereas the carbon gasification rate was increased for charcoal gasified by 20 mol.% steam possibly due to the more CO 2 was generated by water gas shift reaction for further charcoal gasification, similar results were reported by previous researchers (Berguerand et al, 2010).…”

Section: Charcoal Gasification With Various Gasification Agentssupporting

confidence: 87%

“…5. More CO 2 and H 2 were generated due to the occurrence of water gas shift reaction, as depicted by reaction (4), similar results were reported by Berguerand et al (2010). …”

Section: Charcoal Gasification With Various Gasification Agentssupporting

confidence: 84%

“…Steam or CO 2 as gasification agent to the chemical looping process is widely studied by previous researchers employed with fluidized bed reactor and moving bed reactor (Berguerand et al, 2010;Bayham et al, 2013). However, application of steam/CO 2 mixture for charcoal gasification and combustion is rarely investigated.…”

Section: Introductionmentioning

confidence: 99%

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Chemical Looping Gasification of Charcoal with Iron-Based Oxygen Carriers in an Annular Dual-Tube Moving Bed Reactor

2016

Aerosol Air Qual. Res.

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Charcoal used as solid fuel for chemical looping gasification (CLG) with Fe 2 O 3 /Al 2 O 3 oxygen carriers was investigated in an annular dual-tube moving bed reactor (ADMBR). Pure CO 2 and steam/CO 2 mixture were used to gasify the charcoal in a fixed bed reactor. More combustible gases, CO and H 2 , were observed in the outlet gas streams for charcoal gasification conducted with steam/CO 2 mixture than those with only CO 2 . The yields of fuel gases were determined to modify the equation of oxygen carrier-to-fuel ratio (ϕ) for moving bed operation. More CO and H 2 were generated for charcoal gasification conducted in the moving bed reactor operated with higher oxygen carrier-to-fuel ratios. The heat demand for experiment conducted in the ADMBR was calculated to be 60% of output processing capacity due to the heat consumptions of fuel gasification. In sum, ADMBR is technically feasible to be a fuel reactor for partial oxidization of charcoal by CLG to achieve syngas production under appropriate operating conditions without auxiliary fuel.

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Section: Charcoal Gasification With Various Gasification Agentssupporting

confidence: 87%

“…5. More CO 2 and H 2 were generated due to the occurrence of water gas shift reaction, as depicted by reaction (4), similar results were reported by Berguerand et al (2010). …”

Section: Charcoal Gasification With Various Gasification Agentssupporting

confidence: 84%

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Chemical Looping Gasification of Charcoal with Iron-Based Oxygen Carriers in an Annular Dual-Tube Moving Bed Reactor

2016

Aerosol Air Qual. Res.

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“…The temperature of the reactor greatly affects the char conversion [206,207,267,311,312] and temperatures about 1000 ºC are preferred. Equally, the conversion of CO and H 2 produced during gasification also increases with the temperature although in a lower amount [109].…”

Section: Coal Conversion In the Fuel-reactormentioning

confidence: 99%

Progress in Chemical-Looping Combustion and Reforming technologies

Adánez

Abad

Garcı́a-Labiano

et al. 2012

Progress in Energy and Combustion Science

1,959

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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“…Besides the common chemical and mechanical properties demanded for an oxygen-carrier, in CLC of coal it is especially interesting to find inexpensive oxygen-carriers, as there might be losses of material during ash separation. Lately, different Fe-based ores [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] and industrial by-products [19,26,35] have been evaluated as oxygen-carriers for iG-CLC. Among the different Fe-based oxygen-carriers tested, the use of the natural ore ilmenite has been extensively analyzed.…”

Section: Introductionmentioning

confidence: 99%

Performance of a bauxite waste as oxygen-carrier for chemical-looping combustion using coal as fuel

Mendiara

Gayán

Abad

et al. 2013

Fuel Processing Technology

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In the recently developed Chemical-Looping Combustion (CLC) technology, the oxygen needed for the oxidation of the fuel is provided by an oxygen-carrier. Today, there is an increasing interest on CLC application to solid fuels, especially coal. One of the possibilities to process coal in a CLC system is the in situ gasification and subsequent combustion of the product gases (iG-CLC). Potential CLC oxygen-carriers should comply with some chemical and mechanical requirements but it would be interesting that the carrier is as inexpensive as possible, as some losses are expected accompanying the coal ashes. In the present work, a residue from alumina production mainly constituted by Fe 2 O 3 has been tested as oxygencarrier in CLC of coal. Batch experiments were carried out in a fluidized-bed reactor using a bituminous coal as fuel. The effect of operating conditions, such as temperature and gasification agent on the char conversion and combustion efficiency of gasification products were evaluated. Several H 2 O/CO 2 mixtures were tested as gasifying agents. After 50 hours of cycling operation in a batch fluidized bed, no defluidization or agglomeration problems were observed. A gain in the reactivity of the bauxite waste was observed with the number of redox cycles. The carrier showed high combustion efficiencies at all temperatures tested meaning that the bauxite waste was capable of burning the gases generated during the gasification of the char. The percentage of CO 2 in the feeding should be limited in order to maintain high gasification rates and combustion efficiencies. The present results indicate that this bauxite waste is a promising oxygen-carrier for the iG-CLC of coal.

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Batch testing of solid fuels with ilmenite in a 10kWth chemical-looping combustor

Cited by 66 publications

References 23 publications

Chemical Looping Gasification of Charcoal with Iron-Based Oxygen Carriers in an Annular Dual-Tube Moving Bed Reactor

Chemical Looping Gasification of Charcoal with Iron-Based Oxygen Carriers in an Annular Dual-Tube Moving Bed Reactor

Progress in Chemical-Looping Combustion and Reforming technologies

Performance of a bauxite waste as oxygen-carrier for chemical-looping combustion using coal as fuel

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