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Design and operation of a 50kWth Chemical Looping Combustion (CLC) unit for solid fuels

Author

Listed:
  • Abad, Alberto
  • Pérez-Vega, Raúl
  • de Diego, Luis F.
  • García-Labiano, Francisco
  • Gayán, Pilar
  • Adánez, Juan

Abstract

A Chemical Looping Combustion (CLC) unit for solid fuels has been designed, erected and operated. The design was based on a thermal power of 20kWth for in-situ Gasification Chemical Looping Combustion (iG-CLC) or 50kWth for Chemical Looping with Oxygen Uncoupling (CLOU). Fuel and air reactors are two interconnected circulating fluidized beds reactors, with the coal being fed at the bottom of the fuel reactor to maximize the contact between the volatile matter and the oxygen carrier particles. A carbon stripper has been included between fuel and air reactors to increase the CO2 capture rates. In this unit, the char particles are separated from the oxygen carrier particles and recirculated to the fuel reactor. The solids flow exiting from the fuel reactor is split into two different streams by using a double loop seal down the fuel reactor cyclone. One goes to the carbon stripper and the other is recirculated to the fuel reactor. In this way it is possible to have an independent control of solids inventory in the fuel reactor and the global solids circulation flow rate between fuel and air reactors. First operational results at steady state have been obtained with stable operation in iG-CLC mode during combustion of a bituminous coal with ilmenite being the oxygen carrier. A CO2 capture value of 88% at 991°C and a total oxygen demand value of 8.5% were obtained with a solids inventory in the fuel reactor of 470kg/MWth.

Suggested Citation

  • Abad, Alberto & Pérez-Vega, Raúl & de Diego, Luis F. & García-Labiano, Francisco & Gayán, Pilar & Adánez, Juan, 2015. "Design and operation of a 50kWth Chemical Looping Combustion (CLC) unit for solid fuels," Applied Energy, Elsevier, vol. 157(C), pages 295-303.
    • Handle: RePEc:eee:appene:v:157:y:2015:i:c:p:295-303
    DOI: 10.1016/j.apenergy.2015.03.094
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    References listed on IDEAS

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    1. Lyngfelt, Anders, 2014. "Chemical-looping combustion of solid fuels – Status of development," Applied Energy, Elsevier, vol. 113(C), pages 1869-1873.
    2. Ströhle, Jochen & Orth, Matthias & Epple, Bernd, 2014. "Design and operation of a 1MWth chemical looping plant," Applied Energy, Elsevier, vol. 113(C), pages 1490-1495.
    3. Adánez-Rubio, Iñaki & Abad, Alberto & Gayán, Pilar & García-Labiano, Francisco & de Diego, Luis F. & Adánez, Juan, 2014. "The fate of sulphur in the Cu-based Chemical Looping with Oxygen Uncoupling (CLOU) Process," Applied Energy, Elsevier, vol. 113(C), pages 1855-1862.
    4. Abad, Alberto & Adánez, Juan & Gayán, Pilar & de Diego, Luis F. & García-Labiano, Francisco & Sprachmann, Gerald, 2015. "Conceptual design of a 100MWth CLC unit for solid fuel combustion," Applied Energy, Elsevier, vol. 157(C), pages 462-474.
    5. Thon, Andreas & Kramp, Marvin & Hartge, Ernst-Ulrich & Heinrich, Stefan & Werther, Joachim, 2014. "Operational experience with a system of coupled fluidized beds for chemical looping combustion of solid fuels using ilmenite as oxygen carrier," Applied Energy, Elsevier, vol. 118(C), pages 309-317.
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    3. Luis Míguez, José & Porteiro, Jacobo & Pérez-Orozco, Raquel & Patiño, David & Rodríguez, Sandra, 2018. "Evolution of CO2 capture technology between 2007 and 2017 through the study of patent activity," Applied Energy, Elsevier, vol. 211(C), pages 1282-1296.
    4. Abad, Alberto & Adánez, Juan & Gayán, Pilar & de Diego, Luis F. & García-Labiano, Francisco & Sprachmann, Gerald, 2015. "Conceptual design of a 100MWth CLC unit for solid fuel combustion," Applied Energy, Elsevier, vol. 157(C), pages 462-474.
    5. Adánez-Rubio, Iñaki & Abad, Alberto & Gayán, Pilar & García-Labiano, Francisco & de Diego, Luis F. & Adánez, Juan, 2017. "Coal combustion with a spray granulated Cu-Mn mixed oxide for the Chemical Looping with Oxygen Uncoupling (CLOU) process," Applied Energy, Elsevier, vol. 208(C), pages 561-570.
    6. Zhang, Yitao & Wang, Dawei & Pottimurthy, Yaswanth & Kong, Fanhe & Hsieh, Tien-Lin & Sakadjian, Bartev & Chung, Cheng & Park, Cody & Xu, Dikai & Bao, Jinhua & Velazquez-Vargas, Luis & Guo, Mengqing & , 2021. "Coal direct chemical looping process: 250 kW pilot-scale testing for power generation and carbon capture," Applied Energy, Elsevier, vol. 282(PA).
    7. Mendiara, T. & García-Labiano, F. & Abad, A. & Gayán, P. & de Diego, L.F. & Izquierdo, M.T. & Adánez, J., 2018. "Negative CO2 emissions through the use of biofuels in chemical looping technology: A review," Applied Energy, Elsevier, vol. 232(C), pages 657-684.
    8. Siriwardane, Ranjani & Benincosa, William & Riley, Jarrett & Tian, Hanjing & Richards, George, 2016. "Investigation of reactions in a fluidized bed reactor during chemical looping combustion of coal/steam with copper oxide-iron oxide-alumina oxygen carrier," Applied Energy, Elsevier, vol. 183(C), pages 1550-1564.
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    Keywords

    CO2 capture; CLC; CLOU; Coal; Design;
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