Thermophysical characterization of a by-product from the steel industry to be used as a sustainable and low-cost thermal energy storage material

Ortega‐Fernández, Iñigo; Calvet, Nicolas; Gil, Antoni; Rodríguez‐Aseguinolaza, Javier; Faïk, A.; D’Aguanno, Bruno

doi:10.1016/j.energy.2015.05.153

Cited by 130 publications

(53 citation statements)

References 29 publications

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“…Moreover, the sorbent can be regenerated in very short residence times at 900 °C. In addition to CaO, pretreated steel slag also contains other metallic oxides as impurities such as aluminum, magnesium, iron, and silicon oxides, which would help mitigating the sintering of CaO grains much in the same way as MgO does in the case of dolomite.…”

Section: Multicycle Co2 Capture Behavior Of Limestone Dolomite and Smentioning

confidence: 99%

Energy Consumption for CO₂ Capture by means of the Calcium Looping Process: A Comparative Analysis using Limestone, Dolomite, and Steel Slag

Ortíz

Chacartegui

2016

Energy Tech

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The calcium looping (CaL) process, based upon the dry carbonation/calcination of CaO/CaCO3, is at the center of a potentially low‐cost, second‐generation technology for CO2 capture. This manuscript analyzes the energy penalty that arises from the integration of the CaL process into a coal‐fired power plant using cheap and abundantly available CaO precursors such as natural limestone, dolomite, and steel slag. Experimental results on their multicycle capture capacity behavior obtained from thermogravimetric analysis (TGA) at realistic CaL conditions for CO2 capture are used to this end. This work shows that the specific energy consumption for CO2 avoided (SPECCA) is reduced by using either dolomite or steel slag, whose carbonation kinetics in the diffusive phase are accelerated as compared to limestone. Thus, the use of dolomite as CaO precursor would yield a low SPECCA value of approximately 2 MJ kg−1 CO2 for a residence time of the solids in the carbonator of approximately 10 minutes, which is clearly below the SPECCA value usually reported for conventional amine‐based CO2 capture systems.

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Section: Multicycle Co2 Capture Behavior Of Limestone Dolomite and Smentioning

confidence: 99%

Energy Consumption for CO₂ Capture by means of the Calcium Looping Process: A Comparative Analysis using Limestone, Dolomite, and Steel Slag

Ortíz

Chacartegui

2016

Energy Tech

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“…In this project, different breakthrough concepts are being investigated aiming to search an optimum management of the available raw materials and energetic resources. One of its core contributions is the introduction of steel slag, a by‐product of the steelmaking industry, as a material for high temperature heat storage . In particular, it suggests the use of slag as a filler material in packed bed arrangements.…”

Section: Introductionmentioning

confidence: 99%

Operation strategies guideline for packed bed thermal energy storage systems

et al. 2018

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Summary Packed bed thermal energy storage (TES) systems have been identified in the last years as one of the most promising TES alternatives in terms of thermal efficiency and economic viability. The relative simplicity of this storage concept opens an important opportunity to its implementation in many environments, from the renewable solar‐thermal frame to the industrial waste heat recovery. In addition, its implicit flexibility allows the use of a wide variety of solid materials and heat transfer fluids, which leads to its deployment in very different applications. Its potential to overcome current heat storage system limitations regarding suitable temperature ranges or storage capacities has also been pointed out. However, the full implementation of the packed bed storage concept is still incomplete since no industrial scale units are under operation. The main underlying reasons are associated to the lack of a complete extraction of the full potential of this storage technology, derived from a successful system optimization in terms of material selection, design, and thermal management. These points have been evidenced as critical in order to attain high thermal efficiency values, comparable to the state‐of‐the‐art storage technologies, with improved technoeconomic performance. In order to bring this storage technology to a more mature status, closer to a successful industrial deployment, this paper proposes a double approach. First, a low‐cost by‐product material with high thermal performance is used as heat storage material in the packed bed. Second, a complete energetic and efficiency analysis of the storage system is introduced as a function of the thermal operation. Overall, the impact of both the selected storage material and the different thermal operation strategies is discussed by means of a thermal model which permits a careful discussion about the implications of each TES deployment strategy and the underlying governing mechanisms. The results show the paramount importance of the selected operation method, able to increase the resulting cycle and material usage efficiency up to values comparable to standard currently used TES solutions.

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“…Nevertheless, considerable amounts (around 24% in EU) are treated as waste for landll or stored onsite at the steelmaking works. 50 In order to obtain CaO suitable for CO 2 capture from steel slag, a pretreatment with acetic acid has been proposed as a possible technique; however, the multicycle CO 2 capture behavior of this material under realistic CaL conditions has been scarcely explored to the best of our knowledge.…”

Section: 40mentioning

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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Thermophysical characterization of a by-product from the steel industry to be used as a sustainable and low-cost thermal energy storage material

Cited by 130 publications

References 29 publications

Energy Consumption for CO₂ Capture by means of the Calcium Looping Process: A Comparative Analysis using Limestone, Dolomite, and Steel Slag

Energy Consumption for CO₂ Capture by means of the Calcium Looping Process: A Comparative Analysis using Limestone, Dolomite, and Steel Slag

Operation strategies guideline for packed bed thermal energy storage systems

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

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Thermophysical characterization of a by-product from the steel industry to be used as a sustainable and low-cost thermal energy storage material

Cited by 130 publications

References 29 publications

Energy Consumption for CO2 Capture by means of the Calcium Looping Process: A Comparative Analysis using Limestone, Dolomite, and Steel Slag

Energy Consumption for CO2 Capture by means of the Calcium Looping Process: A Comparative Analysis using Limestone, Dolomite, and Steel Slag

Operation strategies guideline for packed bed thermal energy storage systems

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

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Energy Consumption for CO₂ Capture by means of the Calcium Looping Process: A Comparative Analysis using Limestone, Dolomite, and Steel Slag

Energy Consumption for CO₂ Capture by means of the Calcium Looping Process: A Comparative Analysis using Limestone, Dolomite, and Steel Slag

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