Evolution of the CO2 carrying capacity of CaO particles in a large calcium looping pilot plant

Diego, M.E.; Arias, B.; Abanades, J.C.

doi:10.1016/j.ijggc.2017.04.005

Cited by 30 publications

(12 citation statements)

References 52 publications

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“…The above results indicate that future investigations of tar reforming characteristics based on fluidized‐bed tests are essential. First, a fluidized‐bed reactor is suitable for practical applications of CLG 67 ; second, the performance of a synthesized absorbent can be evaluated better under fluidizing conditions, which are beneficial to enhance the mass and heat transfer between the synthesized absorbent and reaction gases 68,69 …”

Section: Resultsmentioning

confidence: 99%

Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation

Han

et al. 2021

Int J Energy Res

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Summary Promoting multicycle CO2 absorption ability and mechanical strength while enhancing heavy tar elimination performance of calcium‐based absorbents is a significant challenge for calcium looping gasification (CLG). A synthesized absorbent Fe/Ca‐Al was developed by an impregnation method consisting of two steps, during which an inert support and an iron catalytic component were integrated with calcium oxide (CaO). Fe/Ca‐Al was compared with three other candidate absorbents in terms of their basic properties and performances. Results indicated that the major components of the synthesized Fe/Ca‐Al were CaO, mayenite (Ca12Al14O33), and Ca2Fe2O5. The CO2 absorption ability of Fe/Ca‐Al gradually increased within 10 carbonation–calcination cycles and the mechanical strength was apparently promoted by the component Ca12Al14O33. Fe/Ca‐Al approached the largest conversion for the heavy tar model component 1‐methylnaphthalene (70.6%), the highest H2 yield (0.18 mol/[hr·g]), and the least coke deposition (8.18 mg/g) during reforming. The synergistic effects of Ca12Al14O33 and Ca2Fe2O5 on the performance of Fe/Ca‐Al were analyzed. The effects of the mass ratio Fe/CaO, temperature of reforming reaction, molar ratio of S/C in tar, and the absorbent particle size on the reforming performance of heavy tar were also explored. The results of this study should provide useful information and possible solutions for CLG to overcome development obstacles. Novelty Statement The present work simultaneously addresses the key challenges of CaO‐based absorbents, including not only cyclic carbonation reactivity and mechanical strength of the absorbents but also heavy tar reduction performance and the influence of different reaction conditions, which are rarely reported in the literature. A synthesized iron‐calcium absorbent is developed by a two‐step impregnation method, which is beneficial to enhance biomass heavy tar (such as PAH) reduction, cyclic CO2 capture, and mechanical strength of the absorbent for hydrogen production in calcium looping gasification.

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Section: Resultsmentioning

confidence: 99%

Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation

Han

et al. 2021

Int J Energy Res

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“…This latter aspect has remained an urgent issue required to be addressed for CaL industrial and power applications. ,, The loss of reactivity is usually ascribed to the reduction of suitable pore volume and pore surface area due to several mechanisms such as sintering (i.e., grain growth) and competing reactions (e.g., sulfation). , The influence of sulfation, both with and without steam addition, has been previously investigated for CaL systems. While most work has been completed at TGA , and at the laboratory scale, , some pilot investigations have been reported using limestone , as well as synthetic sorbents …”

Section: Introductionmentioning

confidence: 99%

Calcium Looping: Sorbent and Process Characterization in a 20 kW_th Dual Fluidized Bed

et al. 2021

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This paper presents an experimental investigation at a 20 kW th calcium looping (CaL) facility with a twofold focus. The first objective is on assessing the multicyclic behavior of limestone under continuous dual fluidized bed (DFB) operation. Different carbonation conditions were employed to derive a mathematical expression that is valid to compare the results from DFB and thermogravimetric analysis (TGA) with adequate accuracy. A preliminary screening of three morphologically distinct limestones was conducted by TGA including exposure to SO 2 and H 2 O during carbonation. The second objective is to analyze the influence of multiple process variables (i.e., temperature, CO 2 loading, and H 2 O concentration) on the performance of the 20 kW th CaL facility's bubbling fluidized bed carbonator. Within the investigated range of operating conditions, the chosen carbonator design allowed for CO 2 capture efficiencies as high as 0.99 mol/mol, yielding an apparent carbonation rate (k S φ) of 0.09 s −1 . Paving the way to a more flexible usage of CaL systems, the proposed carbonator design could be integrated into the existing load-following power plants, in preference to a conventional circulating fluidized bed carbonator that is heavily penalized when forced to operate under low capacity factors.

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Section: Introductionmentioning

confidence: 99%

“…CaO-based materials are also distinguished by their adequate and fast kinetics, which have allowed the application of calcium looping in pilot-scale systems of two interconnected fluidizedbed reactors. 6 This reactor configuration is considered very promising for consecutive operation, because of the high solid and gas contact and the efficient heat transfer. 7 Despite their advantages, CaO-based solids suffer from low mechanical and thermal stability, which triggers the decay of their sorption capacity with consecutive cycles of carbonation and calcination.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Calcium-Based Sorbents Derived from Natural Ores and Industrial Wastes for High-Temperature CO₂ Capture

Papalas

Antzaras

Lemonidou

2020

Ind. Eng. Chem. Res.

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This study focuses on the investigation of potential calcium-based, low-cost sorbent materials for post-combustion CO2 capture via carbonate looping. Mineral limestone, carbide slag, and white mud were evaluated for their CO2 sorption activity, with the latter two being industrial wastes retrieved from chlor-alkali and paper pulp plants, respectively. Mineral magnesite was tested as a structural promoter in an attempt to improve the cyclic stability of the sorbents. Different methods consisting of hydration, acetic acid treatment, and a modified sol–gel autocombustion using glycerol as the combustion agent were applied to modify the structural and morphological characteristics of the mineral- and waste- derived CaO and improve their performance. Preliminary thermogravimetric analysis (TGA) tests proved the superiority of limestone and carbide slag treated with glycerol autocombustion over white mud. The addition of magnesite was considered more beneficial via the acetic acid treatment, since the promoted limestone and carbide slag presented adequate stability under 50 sorption/desorption TGA cycles, with a 43.2% and 34.2% deactivation, respectively. The most promising CaO-based sorbents were further evaluated in a bench-scale fluidized-bed reactor, with the promoted materials withstanding sintering more distinctly, even under more severe calcination conditions (880 °C, 50% CO2 concentration). Magnesite-promoted limestone exhibited an initial CO2 uptake of ∼11 mol CO2/kg of sorbent, which corresponds to ∼90% CaO conversion and <35% deactivation after 20 consecutive carbonation cycles, even under harsh calcination conditions. The superiority of the limestone promoted with magnesite was attributed to the enhancement of its pore network due to a reconstruction of its morphology in the presence of steam during the carbonation/calcination cycles.

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Evolution of the CO2 carrying capacity of CaO particles in a large calcium looping pilot plant

Cited by 30 publications

References 52 publications

Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation

Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation

Calcium Looping: Sorbent and Process Characterization in a 20 kW_th Dual Fluidized Bed

Evaluation of Calcium-Based Sorbents Derived from Natural Ores and Industrial Wastes for High-Temperature CO₂ Capture

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Evolution of the CO2 carrying capacity of CaO particles in a large calcium looping pilot plant

Cited by 30 publications

References 52 publications

Promoted calcium looping H 2 production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO 2 absorbent prepared by impregnation

Promoted calcium looping H 2 production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO 2 absorbent prepared by impregnation

Calcium Looping: Sorbent and Process Characterization in a 20 kWth Dual Fluidized Bed

Evaluation of Calcium-Based Sorbents Derived from Natural Ores and Industrial Wastes for High-Temperature CO2 Capture

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Product

Resources

About

Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation

Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation

Calcium Looping: Sorbent and Process Characterization in a 20 kW_th Dual Fluidized Bed

Evaluation of Calcium-Based Sorbents Derived from Natural Ores and Industrial Wastes for High-Temperature CO₂ Capture