CO2 Capture Performance of Dry Sorbents Manufactured by Coal Fly Ash

석탄 화력발전소의 비산재를 이용한 건식 CO2 흡수제 제조 및 특성 연구

  • Lee, Jae Hee (Department of Environmental Engineering, The Catholic University of Korea) ;
  • Wee, Jung-Ho (Department of Environmental Engineering, The Catholic University of Korea)
  • 이제희 (가톨릭대학교 환경공학과) ;
  • 위정호 (가톨릭대학교 환경공학과)
  • Received : 2012.08.16
  • Accepted : 2013.08.12
  • Published : 2013.08.30


This paper investigates the effect of coal-fired fly ash on dry $CO_2$ sorbents as the supports and additives. For this purpose, various kinds of dry sorbent were manufactured by mixing fly-ash, the primary $CO_2$ absorption components (NaOH and CaO) and water with their different combination. Thereafter, their $CO_2$ absorption performance and the property were analyzed. As a result, variation of absorption efficiency and temperature as well as $CO_2$ desorption of the sorbents are confirmed, which may be primarily ascribed to fly-ash addition to the sorbents. Particularly, fly-ash effect is strongly measured in the sorbent manufactured by mixing all four components (named WNCF sorbents). Absorption efficiency of WNCF sorbents at $550^{\circ}C$ is 35.6% higher than that of flyash free sorbent and desorption is solely observed in WNCF sorbents. Fly-ash in WNCF sorbents leads to increase the dispersity of $CO_2$ absorption components and decrease their particle size in the sorbents. In addition, fly-ash is used as the supports and pozzolanic reaction is hindered by NaOH in WNCF sorbent. Furthermore, $CO_2$ desorption from the sorbents may be due to fly-ash. The interaction between fly-ash and $CO_2$ absorption components substantially attenuate the strength between captured $CO_2$ in CaO and NaOH.


Supported by : 한국연구재단


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