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changes in limestone sorbent morphology during cao

changes in limestone sorbent morphology during cao

Changes in Limestone Sorbent Morphology during

2009-2-25  Two limestones were evaluated for CaO-CaCO 3 looping. Changes in the sorbent morphology during the tests were identified by scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX). Changes in pore size distribution and sorbent surface area that occurred during reaction were determined by N 2 BET porosimetry. Thermogravimetric analysis (TGA)

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Changes in Limestone Sorbent Morphology during

2009-3-1  Changes in Limestone Sorbent Morphology during CaO‐CaCO3 Looping at Pilot Scale Hughes, R. W.; Macchi, A.; Lu, D. Y.; Anthony, E. J. 2009-03-01 00:00:00 A pilot‐scale dual fluidized bed combustion system was used for CO2 capture using limestone sorbent with CaO‐CaCO3 looping. The sorbent was regenerated at high temperature using an air‐ or oxygen‐fired fluidized bed calciner with

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Morphological Changes of Limestone Sorbent

2019-12-12  The morphological changes of limestone particles during the cycling and steam reactivation were studied using both an optical microscope and scanning electron microscopy (SEM). The diameters of limestone particles shrank by about 2−7% after 10 carbonation/calcination cycles, and the particle diameters swelled significantly (12−22% increase) after steam reactivation.

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limestone sorbent sorbant -

Changes in Limestone Sorbent Morphology during CaO‐CaCO3 ... A pilot‐scale dual fluidized bed combustion system was used for CO2 capture using limestone sorbent with CaO‐CaCO3 looping. The sorbent was regenerated at high temperature using an air‐ or oxygen‐fired fluidized bed calciner with flue gas recycle firing hardwood pellets.

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Study on the interaction between CaO-based sorbents

2017-2-1  Changes in limestone sorbent morphology during CaO CaCO 3 looping at pilot scale Chem. Eng. Technol. , 32 ( 2009 ) , pp. 425 - 434 CrossRef View Record in Scopus Google Scholar

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Effect of sulfation on CO2 capture of CaO-based

2014-7-1  The different textures of the limestone and SG CaO after initial calcination may cause different morphology changes of the sorbents during the carbonation/sulfation/calcination cycles. After 20 cycles, the limestone experienced serious agglomeration and pore blockage among grains according to Fig. 10(b). Because there are fewer pores available for gas–solid reaction due to the agglomeration of grains, the carbonation rate and sulfation rate of the limestone

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Improved Long-Term Conversion of Limestone

2004-8-6  Changes in Limestone Sorbent Morphology during CaO-CaCO 3 Looping at Pilot Scale. Chemical Engineering Technology 2009, 32 (3) , 425-434. DOI: 10.1002/ceat.200800590. Ying-jie Li, Chang-sui Zhao, Lun-bo Duan, Cai Liang, Qing-zhao Li, Wu Zhou, Hui-chao Chen.

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Reactivity of CaO-based sorbent for Calcium Looping ...

Reactivity of CaO-based sorbent for Calcium Looping Technology in presence of steam ... conditions such as temperature and pressure causes changes in the sorbent initial morphology, responsible for the sorbent decay. ... in order to understand the evolution of the sorbent morphology during cycles. The Random Pore Model was applied to the

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Optimization of the structural characteristics of CaO

2018-6-19  The sorbent prepared via the mechanical mixing of CaCO 3 and MgCO 3 exhibits a very similar trend as limestone-derived CaO, both in terms of CO 2 uptake and cyclic stability.

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fl and the Negative Infl OonCO Capture by

2020-12-22  unmetamorphosed limestone-derived sorbent activity with progressing calcination/carbonation cycles entail grain coars-ening, or growth, by crystallite migration and coalescence, and particle shrinkage, or densification.25 These morphological changes result in an increase in the sorbent’s average pore

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limestone sorbent sorbant -

Changes in Limestone Sorbent Morphology during CaO‐CaCO3 ... A pilot‐scale dual fluidized bed combustion system was used for CO2 capture using limestone sorbent with CaO‐CaCO3 looping. The sorbent was regenerated at high temperature using an air‐ or oxygen‐fired fluidized bed calciner with flue gas recycle firing hardwood pellets.

Get Price

Study on the interaction between CaO-based sorbents

2017-2-1  Changes in limestone sorbent morphology during CaO CaCO 3 looping at pilot scale Chem. Eng. Technol. , 32 ( 2009 ) , pp. 425 - 434 CrossRef View Record in Scopus Google Scholar

Get Price

Reactivity of CaO-based sorbent for Calcium Looping ...

Reactivity of CaO-based sorbent for Calcium Looping Technology in presence of steam ... conditions such as temperature and pressure causes changes in the sorbent initial morphology, responsible for the sorbent decay. ... in order to understand the evolution of the sorbent morphology during cycles. The Random Pore Model was applied to the

Get Price

Optimization of the structural characteristics of CaO

2018-6-19  The sorbent prepared via the mechanical mixing of CaCO 3 and MgCO 3 exhibits a very similar trend as limestone-derived CaO, both in terms of CO 2 uptake and cyclic stability.

Get Price

SO2 retention by reactivated CaO-based sorbent from ...

This paper examines the reactivation of spent sorbent, produced from multiple CO2 capture cycles, for use in SO2 capture. CaO-based sorbent samples were obtained from Kelly Rock limestone using three particle size ranges, each containing different impurities levels. Using a thermogravimetric analyze

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Investigation of natural CaO–MgO sorbent for CO2

2013-4-3  The CaO–MgO sorbent has the best cyclic activity when H 2 O is present during both carbonation and calcination. H 2 O changes the sorbent morphology producing bigger particles and pores for the sintering during calcination but makes the sorbent have more stable surface area for the taking palace of the fast kinetic carbonation reaction ...

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Mechanistic Understanding of CaO‐Based Sorbents

2020-10-13  An ideal CaO-based CO 2 sorbent displays a rapid and (close to) full conversion over many carbonation-calcination cycles. 12, 14, 50, 51 Since a drop in the CO 2 uptake capacity is associated largely with pore blockage due to the large difference in the molar volume between CaO and CaCO 3 and diffusion limitations with increasing thicknesses of ...

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Investigation of natural CaO–MgO sorbent for CO2

The cyclic CO2 capture activity of natural CaO–MgO sorbents derived from dolomite or limestone with different MgO contents has been investigated on a TGA, with the consideration of the influence of H...

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CO2 Capture Performance Using Limestone Modified

2012-8-18  Long-term CO 2 capture capacity of the sorbent is enhanced by modification using propionate acid, resulting in a carbonation conversion of 0.31 for modified limestone after 100 cycles, while the value for original limestone is only 0.08. The surface morphology of the modified limestone after the first calcination is much more porous and the ...

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Influence of Steam Injection during Calcination on the ...

2021-3-12  Steam changes the morphology of the sorbent while calcination is occurring, probably causing a shift from smaller to larger pores, resulting in a structure which increases carrying capacity. It was also demonstrated that steam addition produced a larger impact on sorbent reactivity for carbonation than for calcination.

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limestone sorbent sorbant -

Changes in Limestone Sorbent Morphology during CaO‐CaCO3 ... A pilot‐scale dual fluidized bed combustion system was used for CO2 capture using limestone sorbent with CaO‐CaCO3 looping. The sorbent was regenerated at high temperature using an air‐ or oxygen‐fired fluidized bed calciner with flue gas recycle firing hardwood pellets.

Get Price

Reactivity of CaO-based sorbent for Calcium Looping ...

Reactivity of CaO-based sorbent for Calcium Looping Technology in presence of steam ... conditions such as temperature and pressure causes changes in the sorbent initial morphology, responsible for the sorbent decay. ... in order to understand the evolution of the sorbent morphology during cycles. The Random Pore Model was applied to the

Get Price

Steam Enhanced Calcination for CO2 Capture with CaO

2017-1-31  Steam changes the morphology of the sorbent during calcination, likely by shifting the pore volume to larger pores, resulting in a structure which has an increased carrying capacity. This effect was then examined at the pilot scale to determine if the phase contacting patterns and solids heat-up rates in a fluidized bed were factors.

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Optimization of the structural characteristics of CaO

2018-6-19  The sorbent prepared via the mechanical mixing of CaCO 3 and MgCO 3 exhibits a very similar trend as limestone-derived CaO, both in terms of CO 2 uptake and cyclic stability.

Get Price

SO2 retention by reactivated CaO-based sorbent from ...

This paper examines the reactivation of spent sorbent, produced from multiple CO2 capture cycles, for use in SO2 capture. CaO-based sorbent samples were obtained from Kelly Rock limestone using three particle size ranges, each containing different impurities levels. Using a thermogravimetric analyze

Get Price

Acquiring an effective CaO-based CO2 sorbent and

2020-6-5  Based on the reversible gas–solid reaction of CaO with CO 2 to produce CaCO 3, CaO-based material is considered to be a promising high-temperature solid CO 2 sorbent. 7 CaO becomes a promising CO 2 adsorbent not only because the raw material is low costs and widely available from natural CaO precursors, e.g., chicken eggshells, limestone, but ...

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Investigation of natural CaO–MgO sorbent for CO2

The cyclic CO2 capture activity of natural CaO–MgO sorbents derived from dolomite or limestone with different MgO contents has been investigated on a TGA, with the consideration of the influence of H...

Get Price

Investigation of natural CaO–MgO sorbent for CO2

2013-4-3  The CaO–MgO sorbent has the best cyclic activity when H 2 O is present during both carbonation and calcination. H 2 O changes the sorbent morphology producing bigger particles and pores for the sintering during calcination but makes the sorbent have more stable surface area for the taking palace of the fast kinetic carbonation reaction ...

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Changes in physical structure during calcination of ...

Changes in physical structure during calcination of carbonate rocks ... required for the reaction is produced by thermal dissociation of calcite CaCO3 which is the major constituent of each limestone. Calcite during calcination is decarbonized according to the reaction CaCO3 → CaO + CO2. The quality of such sorbent is usually being related to ...

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CO2 Capture Performance Using Limestone Modified

2012-8-18  Long-term CO 2 capture capacity of the sorbent is enhanced by modification using propionate acid, resulting in a carbonation conversion of 0.31 for modified limestone after 100 cycles, while the value for original limestone is only 0.08. The surface morphology of the modified limestone after the first calcination is much more porous and the ...

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Na2CO3-modified CaO-based CO2 sorbents: the effects

CaO (s) + CO 2 (g) 2 CaCO 3 (s), DH 0 298K = 178 kJ mol 1 and stands out due to the very high theoretical CO 2 uptake capacity of CaO (0.78 g CO 2 g sorbent 1), low predicted CO 2 capture costs(ca. 23.7 USD t CO 2 1)6 and the high abundance andinexpen-siveness of naturally-occurring CaO precursors, e.g. limestone.7 However, the Tammann ...

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Steam Enhanced Calcination for CO2 Capture with CaO

2017-1-31  Steam changes the morphology of the sorbent during calcination, likely by shifting the pore volume to larger pores, resulting in a structure which has an increased carrying capacity. This effect was then examined at the pilot scale to determine if the phase contacting patterns and solids heat-up rates in a fluidized bed were factors.

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Limestone as a sorbent for CO2 capture and its

Limestone CaO precursor is relatively low-cost and readily available. A thorough understanding of the CaO-CO₂ reaction and its reversibility over multiple cycles is required to aid in design, improve efficiency and reduce costs of industrial capture processes.

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Lime-Based Sorbents for High-Temperature CO2

2014-6-19  systems [21,22]. It is typically supposed that during CO2 cycles, the sorbent morphology changes, and the sorbent loses surface area and small pores, which are the main contributors to the rapid carbonation necessary for practical systems. Figure 2. Loss of sorbent (Cadomin limestone, 250–425 µm) activity during

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Mechanism of CaO sulfation in boiler limestone

@article{osti_5931189, title = {Mechanism of CaO sulfation in boiler limestone injection}, author = {Stouffer, M R and Yoon, H and Burke, F P}, abstractNote = {Pilot and industrial-scale tests of boiler limestone injection (BLI) have demonstrated flue gas SO/sub 2/ reductions of around 50% at sorbent utilization efficiencies of 15-20%. The objective of the laboratory research program described ...

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CaO‐Based CO2 Sorbents Effectively Stabilized by

2017-8-18  In agreement with previous works, limestone-derived CaO undergoes a rapid deactivation mostly due to the severe sintering of CaCO 3. 5 Already in the first carbonation cycle, the CO 2 uptake of limestone-derived CaO was 12.2 mmol CO 2 /g sorbent, corresponding to only ≈69 % of its maximal theoretical CO 2 uptake capacity.

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Investigation of natural CaO–MgO sorbent for CO2

The cyclic CO2 capture activity of natural CaO–MgO sorbents derived from dolomite or limestone with different MgO contents has been investigated on a TGA, with the consideration of the influence of H...

Get Price

Acquiring an effective CaO-based CO2 sorbent and

2020-6-5  Based on the reversible gas–solid reaction of CaO with CO 2 to produce CaCO 3, CaO-based material is considered to be a promising high-temperature solid CO 2 sorbent. 7 CaO becomes a promising CO 2 adsorbent not only because the raw material is low costs and widely available from natural CaO precursors, e.g., chicken eggshells, limestone, but ...

Get Price

CO2 Capture Performance Using Limestone Modified

2012-8-18  Long-term CO 2 capture capacity of the sorbent is enhanced by modification using propionate acid, resulting in a carbonation conversion of 0.31 for modified limestone after 100 cycles, while the value for original limestone is only 0.08. The surface morphology of the modified limestone after the first calcination is much more porous and the ...

Get Price

Characterization of calcium carbonate sorbent particle

2012-5-11  Structural changes (e.g., porosity, grain size, and morphology) of the calcined sorbent particles were estimated by BET/BJH, XRD, and SEM analyses. It was shown that sorbent particles rapidly calcined and sintered in the air atmosphere, whereas calcination was delayed in the CO₂ atmosphere due to the higher CO₂ partial pressure.

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