The calcium looping cycle for CO2 capture from power generation, cement manufacture and hydrogen production

Dean, Charles C.; Blamey, John; Florin, Nick; Al-Jeboori, Mohamad J.; Fennell, Paul S.

doi:10.1016/j.cherd.2010.10.013

Cited by 326 publications

(227 citation statements)

References 131 publications

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“…This will fix the activity of CaO at unity early in the experiments and so lead to a low partial pressure of CO 2 to be established in the system. The combined, total reaction occurring with CaO and MF/CaF2 (M = Li or Na) as the active substances is described by equation (3). The Gibbs free energies for the combined reaction for the different alkali-earth metal elements are plotted in Figure 1B.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, up to 20% CaO in CaCl 2 has been used while the solubility of CaO in CaCl 2 at 800°C is 6% [19]. At 74.2% carbonation, this is equivalent to an uptake capacity of CO 2 of 0.105 g/g liquid if 90% CaCO 3 to Ca conversion as recorded with this composition is assumed. This is similar to numbers recently reported for synthetic, stable sorbents in Ca-looping where CaO is present as nanostructures on a solid, inert carrier [21].…”

Section: Resultsmentioning

confidence: 99%

“…This is indicated by the rapid rise in CO 2 being liberated from the cell at around 200 min in Figure 3. Solid CaO (q = 3.3 g/cm 3 ) [17] is relatively heavy compared to the molten salt (q = 2.8 g/cm 3 ) [18] and may deposit toward the lower edges in the inner crucible during the initial melting of the powdery chemicals. Some of it may as such be less easily available for carbonation as it will need to dissolve in the rather basic melt in order to come into contact with the CO 2 being released in the center.…”

Section: Resultsmentioning

confidence: 99%

“…High-temperature post-combustion removal (HT-CCS) by carbonate looping has been identified by The European Technology Platform for Zero-Emission Power Generation (ZEP) as one of the most promising methods in the developing stage [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The concept relies on absorption of CO 2 by CaO with formation of CaCO 3 in the solid state.…”

Section: Introductionmentioning

confidence: 99%

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Carbon capture in molten salts

Olsen

Tomkute

2013

Energy Science & Engineering

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Capture and storage of fossil carbon emitted to the atmosphere from anthropogenic sources has been identified as a key technology for keeping humaninduced global warming below 2°C. Available technologies have not achieved widespread impact due to costs related to increased energy consumption and expensive, large process equipment. Here, we show how molten inorganic halide salt-based mixtures containing CaO may be utilized for selective capture and subsequent controlled release of carbon dioxide from diluted flue gases. Highly efficient absorption is demonstrated in a fluoride-based liquid, absorbing close to 100% of the CO 2 from a simulated flue gas with an absorbing column height of only 10 cm. Greater than 90% carbonation with >80% regeneration to CaO was recorded. Excellent cyclability has been achieved with a chloride-based liquid with 60% carbonation and 100% regeneration to CaO during four cycles. The high efficiencies may enable extraction of CO 2 from highly diluted gas mixtures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon capture in molten salts

Olsen

Tomkute

2013

Energy Science & Engineering

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“…capture efficiencies while minimizing the make-up flow of sorbent. Unless there is a strong synergy with a cement producer (which would also impose limits on the composition of the purge material used), low limestone consumption is always an economic advantage [46][47]. F 0 can be reduced when using high-quality coals and/or when the sorbent is reactivated.…”

Section: Gas Streamsmentioning

confidence: 99%

The impact of calcium sulfate and inert solids accumulation in post-combustion calcium looping systems

Diego¹,

Arias²,

Alonso³

et al. 2013

Fuel

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Postcombustion CO 2 capture by calcium looping (CaL) is being rapidly developed for coal combustion applications. This work discusses the impact of the accumulation of CaSO 4 and other inert solids on CO 2 capture efficiency and the overall CaL process performance. Several process configurations are considered, and the mass and energy balances and an updated carbonator reactor model are solved for each configuration.The minimum fresh sorbent requirements for sustaining a certain level of CO 2 capture efficiency are quantified as well as the effects of an increase in the make-up flow. It was found that the main effect on the CaL process is produced by the sulfur present in the coal fed to the calciner and in the flue gas entering the carbonator. For a typical set of operating conditions it was calculated that the deactivating effect caused by an increase of 0.5% in the sulfur content with respect to a reference coal (low ash content) fed to the calciner is similar to the effect caused by the accumulation of inerts when using a coal with 15% more ash.

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Chemical Looping Combustion and Gasification

Fan

Chung

Bayham

et al. 2015

Handbook of Clean Energy Systems

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With the emerging challenge of climate change and the continued escalation of energy demands, innovative and flexible fuel conversion technologies are necessary and gaining recognition. Chemical looping technologies have the potential to not only reduce energy costs, but also to mitigate carbon emissions. Historically, the general concept of this reduction–oxidation mechanism has been suggested, but the process was never commercialized. Recent interests in carbon capture techniques have revitalized the adaptive chemical looping system. Chemical looping technologies can utilize both gaseous and solid fuels such as natural gas and coal, respectively, for power, hydrogen, or chemical generation. However, the success of technological adoption requires a thorough understanding of the types of chemical looping techniques, the design considerations, and the reactor modes of configurations. Current large‐scale testing units are examined with the hope for near‐term advancement and future commercial application.

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The calcium looping cycle for CO2 capture from power generation, cement manufacture and hydrogen production

Cited by 326 publications

References 131 publications

Carbon capture in molten salts

Carbon capture in molten salts

The impact of calcium sulfate and inert solids accumulation in post-combustion calcium looping systems

Chemical Looping Combustion and Gasification

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