Carbonate looping experiments in a 1MWth pilot plant and model validation

Ströhle, Jochen; Junk, Markus; Kremer, Johannes; Galloy, Alexander; Epple, Bernd

doi:10.1016/j.fuel.2013.12.043

Cited by 205 publications

(94 citation statements)

References 33 publications

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“…In this way, a high CO 2 concentration stream can be retrieved from the calciner for compression and storage or other uses. Thus, the sorbent undergoes repeated carbonation/calcinations (carb/calc) cycles while it is circulated between the calciner and the carbonator [1, [7][8][9][10].…”

Section: The Partially Carbonated Particles Are Then Transported Intomentioning

confidence: 99%

“…Firstly, the high temperature required to achieve a complete regeneration of the sorbent in short residence times since calcination has to be carried out under the high CO 2 partial pressure calciner environment [11][12][13][14]. Such high temperatures would be attained by oxy-combustion in order to avoid CO 2 dilution, which entails a marked energy penalty to the process due to fuel consumption and additional CO 2 production [9,10,[14][15][16][17][18]. The second inconvenient is the progressive deactivation of the sorbent along the successive carb/calc cycles that makes necessary to periodically introduce a fresh limestone makeup into the calciner.…”

Section: The Partially Carbonated Particles Are Then Transported Intomentioning

confidence: 99%

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Effect of dolomite decomposition under CO₂ on its multicycle CO₂ capture behaviour under calcium looping conditions

Martos

Valverde

Jiménez

et al. 2016

Phys. Chem. Chem. Phys.

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One of the main drawbacks that hinder the industrial competitiveness of the Calcium Looping (CaL) process for CO 2 capture is the high temperatures (~930-950ºC) needed in practice to attain full calcination of limestone under a high CO 2 partial pressure environment for short residence times as required in practice. In this work, the multicycle CO 2 capture performance of dolomite and limestone is analysed under realistic CaL conditions and using a reduced calcination temperature of 900ºC, which would serve to mitigate the energy penalty caused by integrating the CaL process into fossil fuel fired power plants. The results show that the fundamental mechanism of dolomite decomposition under CO 2 has a main influence on its superior performance compared to limestone. The inert MgO grains resulting from dolomite decomposition help preserving a nanocrystalline CaO structure wherein carbonation in the solid-state diffusion controlled phase is promoted. The major role played by dolomite decomposition mechanism under CO 2 is clearly demonstrated by the multicycle CaO conversion behaviour observed for samples decomposed at different preheating rates. Limestone decomposition at slow heating rates yields a highly crystalline and poorly reactive CaCO 3 structure that requires long periods to fully decarbonate and shows a severely reduced capture capacity in subsequent cycles. On the other hand, the nascent CaCO 3 produced after dolomite half-decomposition consists of nanosized crystals with a fast decarbonation kinetics regardless of the preheating rate, thus fully decomposing from the very first cycle at a reduced calcination temperature into a CaO skeleton with enhanced reactivity as compared to limestone derived CaO.

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Section: The Partially Carbonated Particles Are Then Transported Intomentioning

confidence: 99%

Section: The Partially Carbonated Particles Are Then Transported Intomentioning

confidence: 99%

Effect of dolomite decomposition under CO₂ on its multicycle CO₂ capture behaviour under calcium looping conditions

Martos

Valverde

Jiménez

et al. 2016

Phys. Chem. Chem. Phys.

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“…Other pilots that have achieved promising results are the 1 MWth pilot plant in Darmstadt (Germany) [10], the 0.3 MWth pilot in La Robla [11], the 0.2 MWth pilot at Stuttgart University (Germany) [12] and the 1.9 MWth pilot that is being constructed in Taiwan [13], apart from smaller projects that have also reported positive results [14][15][16].…”

Section: The Viability Of This Technology Has Been Demonstrated In Sementioning

confidence: 99%

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

Cordero

Alonso

2015

Fuel

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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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“…In order to study the influences of the heat recovery ratio carb , the carbonation temperature carb and the conversions i on the energetic storage density, the ratio of released energy carb to the one of the base case scenario carb + is calculated according to equation (5). Analogously, exergetic storage density can be calculated by equation (6).…”

Section: -2 Figure 2 Duehring Plot Of the Caco 3 /Cao Reactionmentioning

confidence: 99%

“…The reverse reaction (carbonation) (RR1) is characterized by a low reaction enthalpy and a release of high temperature heat. This reaction is extensively studied as a promising technology for the capture of CO 2 out of flue gas streams [5].…”

Section: Introductionmentioning

confidence: 99%

A novel thermochemical energy storage and transportation concept based on concentrated solar irradiation-aided CaO-looping

Obermeier

Müller

Karagiannakis

et al. 2016

AIP Conference Proceedings

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Experimental study of compatibility of reduced metal oxides with thermal energy storage lining materials AIP Conference Proceedings 1734, 050013 (2016) Abstract. To overcome the temporal and regional gap of surplus solar energy, the concept of thermochemical heat storage is discussed. In this particular case, the application of CaO and CaCO 3 as energy carrying compounds for a trans-regional energy distribution concept is analyzed regarding the effective energetic and exergetic storage density. In a comprehensive sensitivity analysis, the influences of reaction temperature, conversion and heat recovery strategies are worked out. It can be seen that the effective storage density is strongly influenced by the preheating of reactants from ambient to reaction temperature. Thus, high conversion rates during forward and reverse reaction as well as improved heat recovery ratios are necessary to achieve a high energetic storage density. In case of effective exergetic storage density, carbonation temperature reaches an optimum. The method presented in this contribution can be applied to similar thermochemical heat storage systems and the results are of great importance for the process design and development of the suggested concept.

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Carbonate looping experiments in a 1MWth pilot plant and model validation

Cited by 205 publications

References 33 publications

Effect of dolomite decomposition under CO₂ on its multicycle CO₂ capture behaviour under calcium looping conditions

Effect of dolomite decomposition under CO₂ on its multicycle CO₂ capture behaviour under calcium looping conditions

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

A novel thermochemical energy storage and transportation concept based on concentrated solar irradiation-aided CaO-looping

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Carbonate looping experiments in a 1MWth pilot plant and model validation

Cited by 205 publications

References 33 publications

Effect of dolomite decomposition under CO2 on its multicycle CO2 capture behaviour under calcium looping conditions

Effect of dolomite decomposition under CO2 on its multicycle CO2 capture behaviour under calcium looping conditions

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

A novel thermochemical energy storage and transportation concept based on concentrated solar irradiation-aided CaO-looping

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Product

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Effect of dolomite decomposition under CO₂ on its multicycle CO₂ capture behaviour under calcium looping conditions

Effect of dolomite decomposition under CO₂ on its multicycle CO₂ capture behaviour under calcium looping conditions