Performance and degradation mechanisms of CLC particles produced by industrial methods

Lambert, Arnold; Tilland, Airy; Pelletant, William; Bertholin, Stéphane; Moreau, F.; Clémençon, Isabelle; Yazdanpanah, Mahdi

doi:10.1016/j.fuel.2017.11.115

Cited by 22 publications

(19 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These units can be classified depending on the fluid dynamic characteristics of the fuel reactor. Thus, 10 kW th CLC units located at ICB-CSIC [10,11] and IFP [12] were designed for bubbling fluidized bed conditions in the fuel reactor, while the fuel reactor in the 120 kW th unit and TUV [13][14][15] and 150 kW th unit at SINTEF [16] were circulating fluidized beds. Recently, the 120 kW th CLC unit at TUV has been modified to include a wider section in the bottom part of the reactor, but maintaining the circulation of solids in a narrow riser above the bottom bed [17].…”

Section: Introductionmentioning

confidence: 99%

Relevance of plant design on CLC process performance using a Cu-based oxygen carrier

Abad

Gayán

Diego

et al. 2018

Fuel Processing Technology

View full text Add to dashboard Cite

Previously validated mathematical CLC models were used to simulate the process performance of CLC methane combustion using an impregnated Cu-based material and to analyse the effect of the fuel reactor design; being either a bubbling fluidized bed or a circulating fluidized bed. The CLC models considered both the fluid dynamic of the fluidized beds at the specific regime and the corresponding kinetics of oxygen carrier reduction. From the model outputs, the performance of the different systems was assessed by calculating the methane conversion in the fuel reactor. Main results highlights that the selection of a suitable particle size of the oxygen carrier and cross section area are key factors to achieve complete combustion with low solids inventory in the fuel reactor. In addition, the growing of bubbles should be limited in order to achieve high CH 4 conversion with low solids inventory values, mainly in the bubbling regime with low cross section areas. Complete combustion was predicted with solids inventory in the fuel reactor of 250 kg/MW th (1 m 2 /MW and particle size of 0.25 mm) or 125 kg/MW th (0.2 m 2 /MW and a particle size of 0.15 mm) in the bubbling and turbulent regime, respectively. Considering the pressure drop related to these conditions, conclusions for the optimization design of a CLC unit using the impregnated material are drawn based on the results of the modelling and simulation.

show abstract

Section: Introductionmentioning

confidence: 99%

Relevance of plant design on CLC process performance using a Cu-based oxygen carrier

Abad

Gayán

Diego

et al. 2018

Fuel Processing Technology

View full text Add to dashboard Cite

show abstract

“…It should be said that copper oxide impregnated on materials based on γ-Al2O3 has shown low attrition, [89]. Unfortunately, the copper oxide reacts with the support to CuAl2O4, which is still a good oxygen carrier but without the excellent CLOU properties of CuO, [90][91][92]. But so far only a limited number of copper oxides have been examined, and the unique performance of copper-CLOU materials makes it worthwhile to pursue the investigation of copper-based materials.…”

Section: 3 Cu-based Materialsmentioning

confidence: 99%

11,000 h of chemical-looping combustion operation—Where are we and where do we want to go?

Lyngfelt

Brink

Langørgen

et al. 2019

International Journal of Greenhouse Gas Control

165

111

View full text Add to dashboard Cite

A key for chemical-looping combustion (CLC) is the oxygen carrier. The ultimate test is obviously the actual operation, which reveals if it turns to dust, agglomerates or loses its reactivity or oxygen carrier capacity. The CLC process has been operated in 46 smaller chemical-looping combustors, for a total of more than 11,000 h. The operation involves both manufactured oxygen carriers, with 70% of the total time of operation, and less costly materials, i.e. natural ores or waste materials. Among manufactured materials, the most popular materials are based on NiO with 29% of the operational time, Fe2O3 with 16% and CuO with 13%. Among the monometallic oxides there are also Mn3O4 with 1%, and CoO with 2%. The manufactured materials also include a number of combined oxides with 11% of operation, mostly calcium manganites and other combined manganese oxides. Finally, the natural ores and waste materials include ilmenite, FeTiO3 with 13%, iron ore/waste with 9% and manganese ore with 6%. In the last years a shift towards more focus on CuO, combined oxides and natural ores has been seen.A major difficulty with the scaling-up of a novel process is in the risk. First-of-itskind large-scale projects include risks of technical mistakes and unforeseen obstacles, leading to added costs or, in the worst case, failure. One way of addressing these risks is to focus on the heart of the process and build it with maximum flexibility for future use. A concept for maximum flexibility is the Multipurpose Dual Fluidized Bed (MDFB). Another is to find a suitable existing plant, e.g. a dual fluidized-bed thermal gasifier.With present emissions the global CO2 budget associated with a maximum temperature of 2ºC may be spent in around 20-25 years, whereas the CO2 budget for 1.5ºC is may be exhausted in 10 years. Thus, the need for both CO2 neutral fuels and negative emissions will become increasingly urgent as we are nearing or transgressing the maximum amount of CO2 that can be emitted without compromising the global climate agreement in Paris saying we must keep "well below" 2ºC and aim for a maximum of 1.5ºC. Thus, biomass may turn out to be a key fuel for Carbon Capture and Storage (CCS), because CO2-free power does not necessarily need CCS, but negative emissions will definitely need Bio-CCS.

show abstract

“…[11,12] While the copper-rich fines formed by attrition are related to the outward migration of the copper, the increased porosity in the particles is associated to the alumina phase transition. [7,13] Recently, Cabello et al reported that the mechanical integrity of the OC is not affected when the redox cycling is carried out at 800 °C, compared to 900 °C or above. [14] This difference in the material behaviour could arise from multiple phase transformations during reactions, owing to high chemical and thermal stress during the redox cycles.…”

Section: Introductionmentioning

confidence: 99%

Role of Copper Migration in Nanoscale Ageing of Supported CuO/Al₂O₃ in Redox Conditions: A Combined Multiscale X‐ray and Electron Microscopy Study

et al. 2023

Self Cite

View full text Add to dashboard Cite

Chemical Looping Combustion is a promising midterm solution to mitigate CO2 emission, by carrying out indirect fuel combustion and allowing inherent separation of CO2. During the CLC process, an oxygen carrying material is subjected to successive oxidation‐reduction reactions at high temperature which induce significant material degradation. CuO/Al2O3 based materials have been widely considered as promising oxygen carriers (OC). However, the oxygen carrier ageing mechanisms (active phase migration and interactions with the support, phase transitions) are not well understood. Herein, an in‐depth overview of the material evolution is achieved by employing a multi‐scale characterization approach. At the μm‐scale, copper migration within the alumina support has been observed using Scanning Transmission X‐ray Microscopy (STXM) and Scanning Electron Microscopy (SEM). The spatial distribution of the Cu−Al species provides information on copper mobility and the different phases interactions. A comprehensive mechanism is proposed concerning the redox behaviour of the CuO/Al2O3 system, relating the diffusion of the Cu‐species, the active phase‐support interactions, and the role of copper in the Al2O3 support phase transition to the temperature and the number of redox cycles. Understanding the ageing process of CuO/Al2O3 materials paves a way to design more stable oxygen‐carriers.

show abstract

Performance and degradation mechanisms of CLC particles produced by industrial methods

Cited by 22 publications

References 18 publications

Relevance of plant design on CLC process performance using a Cu-based oxygen carrier

Relevance of plant design on CLC process performance using a Cu-based oxygen carrier

11,000 h of chemical-looping combustion operation—Where are we and where do we want to go?

Role of Copper Migration in Nanoscale Ageing of Supported CuO/Al₂O₃ in Redox Conditions: A Combined Multiscale X‐ray and Electron Microscopy Study

Contact Info

Product

Resources

About

Performance and degradation mechanisms of CLC particles produced by industrial methods

Cited by 22 publications

References 18 publications

Relevance of plant design on CLC process performance using a Cu-based oxygen carrier

Relevance of plant design on CLC process performance using a Cu-based oxygen carrier

11,000 h of chemical-looping combustion operation—Where are we and where do we want to go?

Role of Copper Migration in Nanoscale Ageing of Supported CuO/Al2O3 in Redox Conditions: A Combined Multiscale X‐ray and Electron Microscopy Study

Contact Info

Product

Resources

About

11,000 h of chemical-looping combustion operation—Where are we and where do we want to go?

Role of Copper Migration in Nanoscale Ageing of Supported CuO/Al₂O₃ in Redox Conditions: A Combined Multiscale X‐ray and Electron Microscopy Study