Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Effect of Pressure on HCl Absorption Behaviors of a K-based Absorbent in the Fixed Bed Reactor

고정층 반응기에서 K-계열 흡수제의 압력에 따른 HCl 흡수 거동 연구

  • Kim, Jae-Young (Greenhouse Gas Center, Korea Institute of Energy Research) ;
  • Park, Young Cheol (Greenhouse Gas Center, Korea Institute of Energy Research) ;
  • Jo, Sung-Ho (Greenhouse Gas Center, Korea Institute of Energy Research) ;
  • Ryu, Ho-Jung (Greenhouse Gas Center, Korea Institute of Energy Research) ;
  • Baek, Jeom-In (Korea Electric Power Research Institute) ;
  • Park, Yeong Seong (Department of Environmental Engineering, Daejeon University) ;
  • Moon, Jong-Ho (Greenhouse Gas Center, Korea Institute of Energy Research)
  • 김재영 (한국에너지기술연구원 온실가스연구단) ;
  • 박영철 (한국에너지기술연구원 온실가스연구단) ;
  • 조성호 (한국에너지기술연구원 온실가스연구단) ;
  • 류호정 (한국에너지기술연구원 온실가스연구단) ;
  • 백점인 (한국전력공사 전력연구원) ;
  • 박영성 (대전대학교 환경공학과) ;
  • 문종호 (한국에너지기술연구원 온실가스연구단)
  • Received : 2013.05.07
  • Accepted : 2013.05.31
  • Published : 2013.06.28
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Abstract

In this study, the hydrogen chloride removal using K-based dry sorbents ($K_2CO_3/Al_2O_3$, KEPRI, Korea) was studied with varying the pressure in a fixed bed reactor (15 cm tall bed with 0.5 cm I.d.). Working temperature was $400^{\circ}C$ and feed gas concentration was 750 ppm (HCl vol%, $N_2$ balance). The chloride sorption capacity of sorbent increases with increasing pressure (1, 5, 10, 15 and 20 bar). Also, after forming KCl crystal by reaction with $K_2CO_3$ and HCl, owing to the strong bonding energy, sorbent regeneration was practically impossible. Its optical, physical and chemical characterizations were evaluated by SEM, EDAX, BET, TGA and XRD. At $400^{\circ}C$ and 20 bar condition, working condition for the dehalogenation process after gasification, K-based dry sorbent showed high HCl sorption capacity and HCl/$N_2$ separation performances comparing with Ca-based and Mg-based dry sorbents.

본 연구에서는 고정층 반응기(높이 15 cm, 내경 0.5 cm)에서 K-계열 건식 흡수제($K_2CO_3/Al_2O_3$, 한국전력공사 전력연구원)를 이용하여 반응압력 변화에 따른 염화수소 흡수 실험을 수행하였다. 반응온도는 가스화 직후, 필터를 거쳐서 주입되는 것을 가정하여 $400^{\circ}C$로 설정하였으며, 반응기체 농도는 750 ppm HCl ($N_2$ balance)으로 설정하였다. 반응압력은 1, 5, 10, 15, 20 bar로 증가시켰다. 압력이 증가할수록 K-계열 흡수제의 흡수 성능이 증가하였다. 흡수제를 구성하고 있는 주요 물질인 $K_2CO_3$가 HCl 가스와 반응하여 KCl 결정을 형성하였으며, 강한 결합에너지로 인하여 흡수제의 재생이 실질적으로 불가능하였다. 이에 대한 광학적, 물리적, 화학적 특성을 SEM, EDX, BET, TGA, XRD를 이용하여 분석하였다. $400^{\circ}C$, 20 bar 조건(가스화 이후 탈할로겐 공정의 온도 및 압력조건)에서 $K_2CO_3$ 흡수제는 Ca 계열 및 Mg 계열의 흡수제에 비해 높은 HCl 흡수능 및 HCl/$N_2$ 분리 거동을 보였다.

Keywords

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