KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Screening of Spray-Dried K2CO3-Based Solid Sorbents using Various Support Materials for CO2 Capture

  • Eom, Tae Hyoung (KEPCO Research institute, Korea Electric Power Corporation) ;
  • Lee, Joong Beom (KEPCO Research institute, Korea Electric Power Corporation) ;
  • Baek, Jeom In (KEPCO Research institute, Korea Electric Power Corporation) ;
  • Ryub, Chong Kul (Korea Carbon Capture and Storage Assocoation) ;
  • Rhee, Young Woo (Department of Chemical Engineering, Chungnam National University)
  • Published : 2015.09.30
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Abstract

$K_2CO_3$-based dry regenerable sorbents were prepared by spray-drying techniques to improve mass produced $K_2CO_3-Al_2O_3$ sorbents (KEP-CO2P, hereafter), and then tested for their $CO_2$ sorption capacity by a $2,000Nm^3/h$ (0.5 MWe) $CO_2$ capture pilot plant built for Unit 3 of the Hadong thermal power station in 2010. Each of the sample sorbents contained 35 wt.% $K_2CO_3$ as the active materials with various support materials such as $TiO_2$, MgO, Zeolite 13X, $Al_2O_3$, $SiO_2$ and hydrotalcite (HTC). Their physical properties and reactivity were tested to evaluate their applicability to a fluidized-bed or fast transport-bed $CO_2$ capture process. The $CO_2$ sorption capacity and percentage utilization of $K_2CO_3$-MgO based sorbent, Sorb-KM2, was $8.6g-CO_2/100g$-sorbents and 90%, respectively, along with good mechanical strength for fluidized-bed application. Sorbs-KM2 and KT were almost completely regenerated at $140^{\circ}C$. No degradation of Sorb-KM by $SO_2$ added as a pollutant in flue gas was observed during a cycle test.

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