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Role of precalcination and regeneration conditions on postcombustion CO2 capture in the Ca-looping technology

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  • Valverde, J.M.
  • Sanchez-Jimenez, P.E.
  • Perez-Maqueda, L.A.

Abstract

The Ca-looping (CaL) technology is already recognized as a potentially viable method to capture CO2 from postcombustion gas in coal fired power plants. In this process, CO2 is chemisorbed by CaO solid particles derived from precalcination of cheap and widely available natural limestone. The partially carbonated solids are regenerated by calcination under high CO2 concentration. Novel CaL concepts are proposed to further improve the efficiency of the technology such as the introduction of a recarbonation reactor in between the carbonation and calcination stages to mitigate the progressive deactivation of the regenerated CaO. Process simulations aimed at retrieving optimum design parameters and operating conditions to scale-up the technology yield results critically dependent on the multicyclic sorbent performance. Nevertheless, technical limitations usually preclude lab-scale tests from mimicking realistic CaL conditions necessarily involving high CO2 concentration for sorbent regeneration and quick transitions between carbonation and calcination. In this work, a lab-scale experimental analysis is reported on the CaO multicyclic conversion at CaL conditions closely resembling those to be expected in practice. The results presented evidence a relevant role of precalcination conditions. Precalcination in air leads to a strongly adverse effect on the activity of the sorbent regenerated under high CO2 concentration, which is further hindered if a recarbonation stage is introduced. On the other hand, sorbent deactivation is mitigated if precalcination is carried out at conditions similar to those used for sorbent regeneration. In this case, recarbonation helps lessening the loss of multicyclic conversion, which is further enhanced by the synergistic combination with heat pretreatment. Moreover, the present study shows that the kinetics of carbonation is strongly dependent on precalcination and regeneration conditions. The diffusion controlled carbonation phase and recarbonation are intensified if the sorbent is precalcined and regenerated under high CO2 concentration whereas the reaction controlled carbonation phase is notably hampered.

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  • Valverde, J.M. & Sanchez-Jimenez, P.E. & Perez-Maqueda, L.A., 2014. "Role of precalcination and regeneration conditions on postcombustion CO2 capture in the Ca-looping technology," Applied Energy, Elsevier, vol. 136(C), pages 347-356.
    • Handle: RePEc:eee:appene:v:136:y:2014:i:c:p:347-356
    DOI: 10.1016/j.apenergy.2014.09.052
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    1. Valverde, J.M. & Sanchez-Jimenez, P.E. & Perez-Maqueda, L.A., 2014. "Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2," Applied Energy, Elsevier, vol. 126(C), pages 161-171.
    2. Valverde, Jose M. & Sanchez-Jimenez, Pedro E. & Perejon, Antonio & Perez-Maqueda, Luis A., 2013. "Constant rate thermal analysis for enhancing the long-term CO2 capture of CaO at Ca-looping conditions," Applied Energy, Elsevier, vol. 108(C), pages 108-120.
    3. Valverde, J.M. & Sanchez-Jimenez, P.E. & Perez-Maqueda, L.A. & Quintanilla, M.A.S. & Perez-Vaquero, J., 2014. "Role of crystal structure on CO2 capture by limestone derived CaO subjected to carbonation/recarbonation/calcination cycles at Ca-looping conditions," Applied Energy, Elsevier, vol. 125(C), pages 264-275.
    4. Wang, Jinsheng & Manovic, Vasilije & Wu, Yinghai & Anthony, Edward J., 2010. "A study on the activity of CaO-based sorbents for capturing CO2 in clean energy processes," Applied Energy, Elsevier, vol. 87(4), pages 1453-1458, April.
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    3. Perejón, Antonio & Romeo, Luis M. & Lara, Yolanda & Lisbona, Pilar & Martínez, Ana & Valverde, Jose Manuel, 2016. "The Calcium-Looping technology for CO2 capture: On the important roles of energy integration and sorbent behavior," Applied Energy, Elsevier, vol. 162(C), pages 787-807.
    4. Sánchez Jiménez, Pedro E. & Perejón, Antonio & Benítez Guerrero, Mónica & Valverde, José M. & Ortiz, Carlos & Pérez Maqueda, Luis A., 2019. "High-performance and low-cost macroporous calcium oxide based materials for thermochemical energy storage in concentrated solar power plants," Applied Energy, Elsevier, vol. 235(C), pages 543-552.
    5. Shi, Jiewen & Li, Yingjie & Zhang, Qing & Ma, Xiaotong & Duan, Lunbo & Zhou, Xingang, 2017. "CO2 capture performance of a novel synthetic CaO/sepiolite sorbent at calcium looping conditions," Applied Energy, Elsevier, vol. 203(C), pages 412-421.
    6. Ma, Xiaotong & Li, Yingjie & Shi, Lei & He, Zirui & Wang, Zeyan, 2016. "Fabrication and CO2 capture performance of magnesia-stabilized carbide slag by by-product of biodiesel during calcium looping process," Applied Energy, Elsevier, vol. 168(C), pages 85-95.
    7. Abanades, Stéphane & André, Laurie, 2018. "Design and demonstration of a high temperature solar-heated rotary tube reactor for continuous particles calcination," Applied Energy, Elsevier, vol. 212(C), pages 1310-1320.
    8. Duan, Liqiang & Feng, Tao & Jia, Shilun & Yu, Xiaohui, 2016. "Study on the performance of coal-fired power plant integrated with Ca-looping CO2 capture system with recarbonation process," Energy, Elsevier, vol. 115(P1), pages 942-953.
    9. Tian, Sicong & Li, Kaimin & Jiang, Jianguo & Chen, Xuejing & Yan, Feng, 2016. "CO2 abatement from the iron and steel industry using a combined Ca–Fe chemical loop," Applied Energy, Elsevier, vol. 170(C), pages 345-352.
    10. Hu, Yue & Ahn, Hyungwoong, 2017. "Process integration of a Calcium-looping process with a natural gas combined cycle power plant for CO2 capture and its improvement by exhaust gas recirculation," Applied Energy, Elsevier, vol. 187(C), pages 480-488.
    11. Ortiz, C. & Romano, M.C. & Valverde, J.M. & Binotti, M. & Chacartegui, R., 2018. "Process integration of Calcium-Looping thermochemical energy storage system in concentrating solar power plants," Energy, Elsevier, vol. 155(C), pages 535-551.
    12. Barelli, L. & Bidini, G. & Gallorini, F., 2016. "CO2 capture with solid sorbent: CFD model of an innovative reactor concept," Applied Energy, Elsevier, vol. 162(C), pages 58-67.
    13. Ortiz, C. & Chacartegui, R. & Valverde, J.M. & Becerra, J.A., 2016. "A new integration model of the calcium looping technology into coal fired power plants for CO2 capture," Applied Energy, Elsevier, vol. 169(C), pages 408-420.

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