Energy penalty reduction in the calcium looping cycle

Martínez, Ana; Lara, Yolanda; Lisbona, Pilar; Romeo, Luis M.

doi:10.1016/j.ijggc.2011.12.005

Cited by 89 publications

(96 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A high energy input is necessary to increase the input stream temperature up to the value required for the endothermic calcination reaction to occur at a sufficiently fast rate, which is essentially determined by the composition of the gas in the calcination environment [24,25] . Once sensible heat from the CaO and CO 2 streams at the calciner outlet is recovered, these products are stored at ambient temperature for their use afterwards as a function of demand.…”

Section: Introductionmentioning

confidence: 99%

“…Under these conditions, limestone derived CaO exhibits a severe drop of conversion in only a few cycles converging towards a residual value of just about 0.07, which makes it necessary to periodically purge the poorly active sorbent and replace it by a makeup flow of fresh limestone. The efficiency of the calciner reactor and the energy penalty efficiency caused by the CaL integration [32,33] into coal fired power plants (CFPP) have been also important subjects of analysis [25,[34][35][36]. Pilot plants (of size on the order of 1-2 MWth) demonstrate the achievement of CO 2 capture efficiencies around 90% [37,38] whereas model simulations predict an efficiency penalty on power generation around 5-6% when scaling up the technology to a commercial level [39].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermochemical energy storage of concentrated solar power by integration of the calcium looping process and a CO2 power cycle

et al. 2016

View full text Add to dashboard Cite

Energy storage is the main challenge for a deep penetration of renewable energies into the grid to overcome their intrinsic variability. Thus, the commercial expansion of renewable energy, particularly wind and solar, at large scale depends crucially on the development of cheap, efficient and non-toxic energy storage systems enabling to supply more flexibility to the grid. The Ca-Looping (CaL) process, based upon the reversible carbonation/calcination of CaO, is one of the most promising technologies for thermochemical energy storage (TCES), which offers a high potential for the long-term storage of energy with relatively small storage volume. This manuscript explores the use of the CaL process to store Concentrated Solar Power (CSP). A CSP-CaL integration scheme is proposed mainly characterized by the use of a CO 2 closed loop for the CaL cycle and power production, which provides heat decoupled from the solar source and temperatures well above the ~550ºC limit that poses the use of molten salts currently used to store energy as sensible heat. The proposed CSP-CaL integration leads to high values of plant global efficiency (of around 45-46%) with a storage capacity that allows for long time gaps between load and discharge. Moreover, the use of environmentally benign, abundantly available and cheap raw materials such as natural limestone would mark a milestone on the road towards the industrial competitiveness of CSP.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermochemical energy storage of concentrated solar power by integration of the calcium looping process and a CO2 power cycle

et al. 2016

View full text Add to dashboard Cite

show abstract

“…There are inherent thermodynamic advantages to this process, compared to other post-combustion CCS technologies, and a number of researchers have determined that this process imposes an efficiency penalty on a power station significantly lower than that imposed by either oxyfuel combustion or MEA scrubbing, at 6-8% points, as opposed to 10 -12 points for the latter technologies. (Romeo et al, 2010, Lin et al, 2011, Daval et al, 2011, Martinez et al, 2012 One issue which has received significant attention during previous research is that the ability of CaO produced from natural limestone reduces significantly (from ~ 0.7 mol CO2/mol CaO) when it is first used to capture CO2 to a significantly lower level (~0.1 mol CO2/mol CaO) after 30 cycles of calcination and carbonation (Fennell et al, 2007a, Blamey et al, 2010a) (hereafter, the number of moles of CO2 reacted per mole of CaO will be referred to as the carrying capacity of the limestone) .…”

Section: Introductionmentioning

confidence: 99%

Additive effects of steam addition and HBr doping for CaO-based sorbents for CO 2 capture

González

Blamey

Al-Jeboori

et al. 2016

Chemical Engineering and Processing: Process Intensification

View full text Add to dashboard Cite

Calcium looping is a developing CO2 Capture and Storage technology that employs the reversible carbonation of CaO (potentially derived from natural limestone). The CO2 uptake potential of CaO particles reduces upon repeated reaction, largely through loss of reactive surface area and densification of particles. Doping of particles has previously been found to reduce the rate of decay of CO2 uptake, as has the introduction of steam into calcination and carbonation stages of the reaction. Here, the synergistic effects of steam and doping, using an HBr solution, of 5 natural limestones have been investigated. The enhancement to the CO2 uptake was found to be additive, with CO2 uptake after 13 cycles found to be up to 3 times higher for HBr-doped limestones subjected to cycles of carbonation and calcination in the presence of 10% steam, in comparison to natural limestone cycled in the absence of steam. A qualitative discussion of kinetic data is also presented.

show abstract

“…Abanades (2002) carries out a similar analysis (later expanded by Grasa et al 2009, Rodriguez et al 2010and Martínez et al 2012) for a carbonation-calcination loop and computes the asymptotic value of absorption capacity for an infinite number of cy. Instead, average age is here computed for any finite N ; the asymptotic behavior is then obtained.…”

Section: Agementioning

confidence: 99%

Selective strategy for solid sorbent replacement in CCS

Colantuono

Cockerill

2017

Chemical Engineering Research and Design

View full text Add to dashboard Cite

Please cite this article as: Giuseppe Colantuono, Timothy Cockerill, Selective strategy for solid sorbent replacement in CCS, (2017), http://dx.doi.org/10. 1016/j.cherd.2017.01.030 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Page 1 of 21A c c e p t e d M a n u s c r i p tThe continuous replacement of solid sorbent in post-combustion CCS loops is modeled. The known method removes/replaces a constant amount of sorbent after each iteration. Known method discards fresher material, too, as the looping sorbent is fully mixed. We can sort removed CO2-loaded sorbent: the fresher is denser due to higher capacity. Our novel strategy puts freshest sorbent back; we compute the reduced need of sorbent. *Research HighlightsPage 2 of 21 AbstractAn innovative method for sorbent replacement in the looping of a generic solid sorbent for post-combustion carbon capture and sequestration (CCS) is introduced. First, the standard replacement method is revisited with some original results presented. A new strategy is then modeled, aimed at selectively replacing the material as it degrades. This method exploits the density difference, after adsorption, between relatively fresh, CO 2 -laden sorbent and relatively degraded material, with small residual adsorption capacity. The model is then applied to values of degradation rate within the experimental range available in scientific literature for silica-supported amines (SSA). The selective removal strategy ideally allows a saving of 37% of the sorbent with respect to the standard, undifferentiated replacement considered in first place, while keeping the same adsorptive capacity of the system.

show abstract

Energy penalty reduction in the calcium looping cycle

Cited by 89 publications

References 27 publications

Thermochemical energy storage of concentrated solar power by integration of the calcium looping process and a CO2 power cycle

Thermochemical energy storage of concentrated solar power by integration of the calcium looping process and a CO2 power cycle

Additive effects of steam addition and HBr doping for CaO-based sorbents for CO 2 capture

Selective strategy for solid sorbent replacement in CCS

Contact Info

Product

Resources

About