Use of CaMn0.875Ti0.125O3as Oxygen Carrier in Chemical-Looping with Oxygen Uncoupling

Leion, Henrik; Larring, Yngve; Bakken, Egil; Bredesen, Rune; Mattisson, Tobias; Lyngfelt, Anders

doi:10.1021/ef900444d

Cited by 159 publications

(132 citation statements)

References 29 publications

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“…Several Also a perovskite type structure can be formed when calcium and manganese are present in the particles. In these cases, Mn(IV) appears to be the oxidized form, whereas deeper reduction of Mn(III) should be avoided in order to preserve the perovskite structure [259]. …”

Section: Mixed Oxides and Perovskites As Oxygen-carriersmentioning

confidence: 99%

Progress in Chemical-Looping Combustion and Reforming technologies

Adánez

Abad

Garcı́a-Labiano

et al. 2012

Progress in Energy and Combustion Science

1,997

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: Mixed Oxides and Perovskites As Oxygen-carriersmentioning

confidence: 99%

Progress in Chemical-Looping Combustion and Reforming technologies

Adánez

Abad

Garcı́a-Labiano

et al. 2012

Progress in Energy and Combustion Science

1,997

1,614

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“…There are only a small number of materials proposed in the literature dealing with the use of Cu- [16][17][18]20,21], and Mn-based [22][23][24][25][26] based materials for CLOU process. An overview of the characteristics of these materials can be found in [9,20,21].…”

mentioning

confidence: 99%

“…In the research group at Chalmers University of Technology, 20 different CLOU materials were tested in batch fluidized bed for combustion of gaseous (CH 4 ) or solid fuels [13,15,17,[22][23]25]. Good results were obtained using an oxygen carrier based on CuO and ZrO 2 as support [13,17].…”

mentioning

confidence: 99%

“…A manganese ore was also tested for CLOU by Rydén et al [24] in a continuous unit using CH 4 , but this material was much less reactive than synthetic Mn/Fe particles. Other material with a spinel perovskite-like type structure, CaMn 0.875 Ti 0.125 O 3 , [25,26] was also evaluated as an oxygen carrier for CLOU process. Conversion rates were lower than those found for Cu-based CLOU materials, although it was still higher compared to normal CLC with solid fuels.…”

mentioning

confidence: 99%

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Identification of operational regions in the Chemical-Looping with Oxygen Uncoupling (CLOU) process with a Cu-based oxygen carrier

Adánez-Rubio

Abad

Gayán

et al. 2012

Fuel

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Chemical-Looping with Oxygen Uncoupling (CLOU) is an alternative chemical-looping process for the combustion of solid fuels with inherent CO 2 capture. The CLOU process demands a material as oxygen carrier with the ability to decompose with O 2 release at suitable temperatures for solid fuel combustion, e.g. copper oxide. This article presents an experimental method to determine the maximum oxygen generation rate of an oxygen carrier as well as to determine the minimum solid inventory that must be used in the fuel reactor. The method here proposed can be used as basis for comparison of the use of different oxygen carriers or type of coals. In this work, the combustion of coal by using a promising Cu-based oxygen carrier prepared by the spray drying method was tested. The oxygen carrier (Cu60MgAl) was composed of 60 wt.% CuO and MgAl 2 O 4 was used as supporting material.Experiments were carried out in a batch fluidized-bed reactor at temperatures ranging from 900 to 980 ºC. Three different regions were identified depending on the oxygen carrier to coal mass ratio. For oxygen carrier to coal ratios higher than 50 (Region I), coal was fully converted to CO 2 and H 2 O. In addition, an excess of oxygen was present in the flue gases, which was close to the equilibrium concentration. When this ratio was in the range 50-25 (Region II), the concentration of oxygen was decreasing whereas some CO was observed as the only unconverted gas. Further decrease in the oxygen carrier to coal ratio below 25 (Region III) caused the depletion of oxygen in the exhaust gases but CO remained as the only Con formato: Inglés (Estados Unidos) 2 unconverted gas. CH 4 or H 2 were never detected at the reactor outlet in any case and agglomeration problems were never observed. These regions were related to the solids inventory in the fuel reactor by the rate of oxygen generation calculated in every case. A maximum rate of oxygen generation for the oxygen carrier was determined as kg O 2 /s per kg of oxygen carrier, which increased with the temperature from 2.1·10 -3 at 930 ºC to 2.8·10 -3 at 980 ºC. From these values, the estimated solids inventory in the fuel reactor was changed from 39 at 930 ºC to 29 kg/MW th at 980 ºC. The results obtained in this work showed that in the CLOU process it is possible to reach full conversion of the solid fuel with very low solids inventory and avoiding the oxygen polishing step.

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“…The packing density was first measured for the four samples followed by the crushing strength test which was carried out following the procedure stated in a reference (Leion et al, 2009). Briefly, a single particle was crushed using the force gauge.…”

mentioning

confidence: 99%

Influence of Porosity on Performance of Freeze-granulated Fe2O3/Al2O3 Oxygen Carriers Used for Chemical Looping Combustion

Zhang¹,

Rubel²,

Mehrez³

et al. 2012

EER

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Chemical looping combustion (CLC) is a promising solution for the next coal-fired power generation technology with inherent CO 2 separation capability. One of the critical aspects for the development of the CLC process is to develop suitable oxygen carrier (OC) particles to transfer oxygen to the fuel in the absence of air. Relevant studies have focused on active material screening, thermodynamic analysis and operational tests. This investigation was conducted on the microstructural property of OCs, to be specific, the particle porosity effect on the performance of iron-based OCs. Fe 2 O 3 , supported on Al 2 O 3 was used as the oxygen carrier. The effect of water content of the spray slurry used to produce the OC was varied to determine the influence of OC porosity on reactivity, oxygen transfer capacity and mechanical durability. A preliminary test was done to establish the minimum and maximum water percentage needed to make slurry. A process that included freeze granulation (FG), freeze drying, and calcination was used to prepare four samples of iron oxide/alumina with various water-to-solid phase ratios. A scanning electron microscope (SEM) was used to characterize the porosity of FG Fe 2 O 3 /Al 2 O 3 particles. A direct relationship was observed. A Shimpo FGE-10X force gauge was used to measure the crushing strength of selected samples. A thermogravimetric analyzer (TGA) coupled with a mass spectrometer (MS) was used to study the change in reaction rates through multiple reduction-oxidation cycles of the samples. Crystallinity of the OCs in reduced and oxidized forms were confirmed by XRD analysis.

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Use of CaMn_0.875Ti_0.125O₃as Oxygen Carrier in Chemical-Looping with Oxygen Uncoupling

Cited by 159 publications

References 29 publications

Progress in Chemical-Looping Combustion and Reforming technologies

Progress in Chemical-Looping Combustion and Reforming technologies

Identification of operational regions in the Chemical-Looping with Oxygen Uncoupling (CLOU) process with a Cu-based oxygen carrier

Influence of Porosity on Performance of Freeze-granulated Fe2O3/Al2O3 Oxygen Carriers Used for Chemical Looping Combustion

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