Integration of a Ca looping system for CO<sub>2</sub> capture in existing power plants

Martínez, Isabel Casabona; Murillo, R.; Grasa, Gemma; Abanades, J.C.

doi:10.1002/aic.12461

Cited by 79 publications

(56 citation statements)

References 25 publications

(27 reference statements)

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“…Other features of the process are that the heat supplied to the calciner can be recovered from different high temperatures sources, thus ensuring an efficient heat integration through the entire power plant and a lower energy penalty 11,12,13,14,15,16 . Another important aspect of CaL compared to other post-combustion CO 2 capture technologies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Investigation of SO₂ Capture in a Circulating Fluidized Bed Carbonator of a Ca Looping Cycle

Arias

Cordero

Alonso

et al. 2013

Ind. Eng. Chem. Res.

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Calcium looping is a post-combustion CO 2 capture technology that uses CaO as a regenerable solid sorbent. One potential advantage of this technology is that it allows flue gases to be treated with SO 2 , avoiding the need for a costly desulfurization step. In this work, we study the desulfurization capacity of a CFB carbonator reactor in a 30 kW th pilot plant that has been used to test CO 2 and SO 2 co-capture. A simple reactor model is applied to analyze the experimental results obtained and to study the effect of the main variables involved in the process: i.e. the circulation rates of solids and the inventory of active material in the CFB reactor.The results obtained have shown that SO 2 capture efficiencies above 0.95 can be achieved in a CFB carbonator even when using a low inventory of active material in the bed. Extreme 2 desulfurization (SO 2 emissions below 5-10 ppmv) is thought to be achievable in large scale CFB carbonators designed to capture CO 2 with CaO.

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Section: Introductionmentioning

confidence: 99%

Investigation of SO₂ Capture in a Circulating Fluidized Bed Carbonator of a Ca Looping Cycle

Arias

Cordero

Alonso

et al. 2013

Ind. Eng. Chem. Res.

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“…Among the technologies developed, the postcombustion calcium looping (CaL) system is one of the most promising due to the economic benefits it offers and experience acquired with similar systems already operating at industrial scale [2][3][4][5][6][7]). One of the main advantages of these emerging CaL technologies is the low cost of the sorbent since natural limestone is used as the preferred source of CaO.…”

Section: Introductionmentioning

confidence: 99%

Modelling of the kinetics of sulphation of CaO particles under CaL reactor conditions

Cordero

Alonso

2015

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Furthermore it is demonstrated that the number of calcination carbonation cycles changes the sulphation patterns of the CaO from heterogeneous to homogeneous in all the limestones tested. For 50 carbonation calcination cycles and for particle sizes below 200 µm, the sulphation pattern is in all cases homogeneous. The sulphation rates were found to be first order with respect to SO 2 , and zero with respect to CO 2 . Steam was observed to have a positive effect only in the diffusion through the product layer controlled regime, as it leads to an improvement in the sulfation rates and effectiveness of the sorbent. Most of the experimental results of sulfation of highly cycled sorbents under all conditions can be fitted by means of the Random Pore Model (RPM) assuming that the kinetics and diffusion through the product layer of the CaSO 4 are the controlling regimes.

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“…[22][23][24][25] In addition, several integration schemes have been proposed to further reduce the energy demand and minimize the penalty on global efficiency at still high capture efficiency. [26][27][28][29][30] On the other hand, lab-scale experiments demonstrate that limestone-derived CaO (lime) suffers a severe sintering at CaL conditions for CO 2 capture, which leads to a drastic drop of the CaO surface available for fast reaction-controlled carbonation in just a few cycles.…”

Section: -21mentioning

confidence: 99%

Use of steel slag for CO₂ capture under realistic calcium-looping conditions

et al. 2016

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aIn this study, CaO derived from steel slag pretreated with diluted acetic acid has been tested as a dry sorbent for CO 2 capture under realistic Ca-Looping (CaL) conditions, which necessarily implies calcination under high CO 2 partial pressure and fast transitions between carbonation and calcination stages. The multicycle capture performance of the sorbent has been investigated by varying the precalcination time, carbonation/calcination residence times and with the introduction of a recarbonation stage. Results show that the sorbent can be regenerated in very short residence times at 900 C under high CO 2 partial pressure, thus reducing the calciner temperature by about 30-50 C when compared to limestone. Although the introduction of a recarbonation stage to reactivate the sorbent, as suggested in previous studies for limestone, results in a slightly enhanced capture capacity, the sorbent performance can be significantly improved if the main role of the solid-state diffusion-controlled carbonation is not dismissed. Thus, a notable enhancement of the capture capacity is achieved when the carbonation residence time is prolonged beyond just a few minutes, which suggests a critical effect of solids residence time in the carbonator on the CO 2 capture efficiency of the CaL process when integrated into a power plant.

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Integration of a Ca looping system for CO₂ capture in existing power plants

Cited by 79 publications

References 25 publications

Investigation of SO₂ Capture in a Circulating Fluidized Bed Carbonator of a Ca Looping Cycle

Investigation of SO₂ Capture in a Circulating Fluidized Bed Carbonator of a Ca Looping Cycle

Modelling of the kinetics of sulphation of CaO particles under CaL reactor conditions

Use of steel slag for CO₂ capture under realistic calcium-looping conditions

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Integration of a Ca looping system for CO2 capture in existing power plants

Cited by 79 publications

References 25 publications

Investigation of SO2 Capture in a Circulating Fluidized Bed Carbonator of a Ca Looping Cycle

Investigation of SO2 Capture in a Circulating Fluidized Bed Carbonator of a Ca Looping Cycle

Modelling of the kinetics of sulphation of CaO particles under CaL reactor conditions

Use of steel slag for CO2 capture under realistic calcium-looping conditions

Contact Info

Product

Resources

About

Integration of a Ca looping system for CO₂ capture in existing power plants

Investigation of SO₂ Capture in a Circulating Fluidized Bed Carbonator of a Ca Looping Cycle

Investigation of SO₂ Capture in a Circulating Fluidized Bed Carbonator of a Ca Looping Cycle

Use of steel slag for CO₂ capture under realistic calcium-looping conditions