مدل‌سازی فرایند چرخه کلسیم با تاکید بر هیدرودینامیک بستر سیال و مشخصات نوع جاذب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده‌ی مهندسی شیمی و نفت، دانشگاه تبریز، تبریز، ایران

2 تبریز-مهندسی شیمی

3 هیات علمی/ دانشگاه تبریز

چکیده

فرآیند چرخه کلسیم به عنوان یک تکنولوژی امید‌بخش برای جذب CO2 خروجی از نیروگاه‌های احتراقی در دهه اخیر مورد توجه قرار گرفته است. به منظور مدل‌سازی این فرایند، هیدرودینامیک بستر سیال و همچنین مشخصات نوع جاذب، بر راندمان چرخه کلسیم تاثیرگذار می‌باشند. در این تحقیق، ابتدا جاذب CaO/Al2O3 با روش سل-ژل سنتز شده و سپس عملکرد آن در طی 20 چرخه کلسیمی با جاذب CaO مورد مقایسه قرار می‌گیرد. بعلاوه مدلی جامع مبتنی بر هیدرودینامیک بستر و همچنین خصوصیات جاذب برای این فرایند ارائه شده و سپس تاثیر پارامترهایی از قبیل سرعت ظاهری گاز، ارتفاع کربناتور و موجودی جاذب بر راندمان فرایند مورد بررسی قرار می‌گیرد. نتایج آزمایشگاهی نشان می‌دهند که جاذب CaO/Al2O3  73 درصد فعالیت خود را در پایان 20 چرخه حفظ می‌کند، درحالیکه این درصد برای جاذب CaO برابر با 21 می‌باشد. نتایج حاصل از مدل‌سازی نشان می‌دهند که راندمان جذب برای جاذب CaO از 69/78 به 68/22 درصد کاهش یافته است، درحالیکه برای جاذب اصلاح شده CaO/Al2O3 از 5/86 به 1/74 درصد کاهش می‌یابد. با بررسی پارامترهای مختلف مشخص می‌شود که موجودی جامد تاثیر قابل ملاحظه‌ای بر روی راندمان جذب داشته و این تاثیرگذاری در مورد سرعت ظاهری گاز و ارتفاع کربناتور به مراتب کمتر می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Modeling the calcium looping process with an emphasis on the bed hydrodynamics and sorbent characteristics

نویسندگان [English]

  • fardin sattari 1
  • Maryam Tahmasebpour 2
  • Mousa Mohammadpourfard 3
1 Faculty of Chemical & Petroleum Engineering, University of Tabriz, Tabriz, Iran
2 تبریز-مهندسی شیمی
3 Associate Professor, Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran. Zip code: 5166616471. Tel/Fax: +984133393146.
چکیده [English]

The calcium looping process is considered a promising technology to CO2 capture emissions from combustion plants in recent decades. To model this process, the bed hydrodynamics as well as the sorbent characteristics will affect the calcium looping efficiency. In this study, CaO/Al2O3 sorbent is first synthesized by sol-gel method and then its performance is compared with pure CaO sorbent through 20 carbonation/calcination cycles. In addition, a general model based on bed hydrodynamics as well as sorbent properties for this process is presented and then the influence of parameters such as superficial gas velocity, carbonator height and sorbent inventory on process efficiency is investigated. Thermogravimetric experiments reveal that CaO/Al2O3 sorbent preserves 73% of its activity at the end of 20 cycles, whereas it is obtained as 21 for pure CaO sorbent. The results obtained from modeling show that the adsorption efficiency is decreased from 78.69 to 22.68% for pure CaO, whereas, it is decreased from 86.5 to 74.1% for modified CaO/Al2O3 sorbent. Finally, by studying the affective parameters it is obtained that the solid inventory has a significant impact on the process efficiency while the gas velocity and the height of the carbonator are far less effective.

کلیدواژه‌ها [English]

  • Calcium looping
  • Modeling CO2 adsorption
  • Calcium oxide sorbent
  • Bed hydrodynamics
  • Carbonator
[1] S. Yaghoobi-Khankhajeh, R. Alizadeh, R. Zarghami, Adsorption modeling of CO2 in fluidized bed reactor, Chemical Engineering Research and Design, 129 (2018) 111-121.
[2] M. Erans, V. Manovic, E.J. Anthony, Calcium looping sorbents for CO2 capture, Applied Energy, 180 (2016) 722-742.
[3] J. Valverde, P. Sanchez-Jimenez, L.A. Perez-Maqueda, Ca-looping for postcombustion CO2 capture: a comparative analysis on the performances of dolomite and limestone, Applied Energy, 138 (2015) 202-215.
[4] T. Shimizu, T. Hirama, H. Hosoda, K. Kitano, M. Inagaki, K. Tejima, A twin fluid-bed reactor for removal of CO2 from combustion processes, Chemical Engineering Research and Design, 77(1) (1999) 62-68.
[5] J. Blamey, E. Anthony, J. Wang, P. Fennell, The calcium looping cycle for large-scale CO2 capture, Progress in Energy and Combustion Science, 36(2) (2010) 260-279.
[6] H. Guo, Z. Xu, T. Jiang, Y. Zhao, X. Ma, S. Wang, The effect of incorporation Mg ions into the crystal lattice of CaO on the high temperature CO2 capture, Journal of CO2 Utilization, 37 (2020) 335-345.
[7] H. Guo, S. Yan, Y. Zhao, X. Ma, S. Wang, Influence of water vapor on cyclic CO2 capture performance in both carbonation and decarbonation stages for Ca-Al mixed oxide, Chemical Engineering Journal, 359 (2019) 542-551.
[8] M. Broda, C.R. Müller, Synthesis of highly efficient, Ca‐based, Al2O3‐stabilized, carbon gel‐templated CO2 sorbents, Advanced Materials, 24(22) (2012) 3059-3064.
[9] A.M. Kierzkowska, L.V. Poulikakos, M. Broda, C.R. Müller, Synthesis of calcium-based, Al2O3-stabilized sorbents for CO2 capture using a co-precipitation technique, International Journal of Greenhouse Gas Control, 15 (2013) 48-54.
[10] C. Zhao, X. Chen, C. Zhao, Multiple-cycles behavior of K2CO3/Al2O3 for CO2 capture in a fluidized-bed reactor, Energy & fuels, 24(2) (2010) 1009-1012.
[11] M. Zhang, Y. Peng, Y. Sun, P. Li, J. Yu, Preparation of CaO–Al2O3 sorbent and CO2 capture performance at high temperature, Fuel, 111 (2013) 636-642.
[12] S. Wu, L. Wang, Improvement of the stability of a ZrO2-modified Ni–nano-CaO sorption complex catalyst for ReSER hydrogen production, international journal of hydrogen energy, 35(13) (2010) 6518-6524.
[13] Y. Hu, W. Liu, H. Chen, Z. Zhou, W. Wang, J. Sun, X. Yang, X. Li, M. Xu, Screening of inert solid supports for CaO-based sorbents for high temperature CO2 capture, Fuel, 181 (2016) 199-206.
[14] A. Antzara, E. Heracleous, A.A. Lemonidou, Improving the stability of synthetic CaO-based CO2 sorbents by structural promoters, Applied energy, 156 (2015) 331-343.
[15] X. Zhang, Z. Li, Y. Peng, W. Su, X. Sun, J. Li, Investigation on a novel CaO–Y2O3 sorbent for efficient CO2 mitigation, Chemical Engineering Journal, 243 (2014) 297-304.
[16] R. Sun, Y. Li, H. Liu, S. Wu, C. Lu, CO2 capture performance of calcium-based sorbent doped with manganese salts during calcium looping cycle, Applied energy, 89(1) (2012) 368-373.
[17] C.-t. Yu, H.-t. Kuo, Y.-m. Chen, Carbon dioxide removal using calcium aluminate carbonates on titanic oxide under warm-gas conditions, Applied Energy, 162 (2016) 1122-1130.
[18] C. Qin, J. Yin, B. Feng, J. Ran, L. Zhang, V. Manovic, Modelling of the calcination behaviour of a uniformly-distributed CuO/CaCO3 particle in Ca–Cu chemical looping, Applied energy, 164 (2016) 400-410.
[19] Y. Hu, W. Liu, J. Sun, M. Li, X. Yang, Y. Zhang, M. Xu, Incorporation of CaO into novel Nd2O3 inert solid support for high temperature CO2 capture, Chemical Engineering Journal, 273 (2015) 333-343.
[20] B. Azimi, M. Tahmasebpoor, P.E. Sanchez-Jimenez, A. Perejon, J.M. Valverde, Multicycle CO2 capture activity and fluidizability of Al-based synthesized CaO sorbents, Chemical Engineering Journal, 358 (2019) 679-690.
[21] A. Lasheras, J. Ströhle, A. Galloy, B. Epple, Carbonate looping process simulation using a 1D fluidized bed model for the carbonator, International Journal of Greenhouse Gas Control, 5(4) (2011) 686-693.
[22] C. Ortiz, R. Chacartegui, J. Valverde, J. Becerra, L.A. Perez-Maqueda, A new model of the carbonator reactor in the calcium looping technology for post-combustion CO2 capture, Fuel, 160 (2015) 328-338.
[23] K. Daizo, O. Levenspiel, Fluidization engineering,  (1991).
[24] M. Alonso, N. Rodríguez, G. Grasa, J. Abanades, Modelling of a fluidized bed carbonator reactor to capture CO2 from a combustion flue gas, Chemical Engineering Science, 64(5) (2009) 883-891.
[25] M. Abreu, P. Teixeira, R.M. Filipe, L. Domingues, C.I. Pinheiro, H.A. Matos, Modeling the deactivation of CaO-based sorbents during multiple Ca-looping cycles for CO2 post-combustion capture, Computers & Chemical Engineering, 134 (2020) 106679.
[26] J.C. Abanades, E.J. Anthony, D.Y. Lu, C. Salvador, D. Alvarez, Capture of CO2 from combustion gases in a fluidized bed of CaO, AIChE Journal, 50(7) (2004) 1614-1622.
[27] D. Escudero, T.J. Heindel, Bed height and material density effects on fluidized bed hydrodynamics, Chemical Engineering Science, 66(16) (2011) 3648-3655.