Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Performance Evaluation of K-based Solid Sorbents Depending on the Internal Structure of the Carbonator in the Bench-scale CO2 Capture Process

벤치급 CO2 포집공정에서 흡수반응기의 내부구조에 따른 K-계열 고체흡수제의 성능평가

  • Kim, Jae-Young (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Lim, Ho (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Woo, Je Min (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Jo, Sung-Ho (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Moon, Jong-Ho (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Lee, Seung-Yong (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Lee, Hyojin (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Yi, Chang-Keun (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Lee, Jong-Seop (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Min, Byoung-Moo (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research) ;
  • Park, Young Cheol (Greenhouse Gas Research Laboratory, Korea Institute of Energy Research)
  • 김재영 (한국에너지기술연구원 온실가스연구실) ;
  • 임호 (한국에너지기술연구원 온실가스연구실) ;
  • 우제민 (한국에너지기술연구원 온실가스연구실) ;
  • 조성호 (한국에너지기술연구원 온실가스연구실) ;
  • 문종호 (한국에너지기술연구원 온실가스연구실) ;
  • 이승용 (한국에너지기술연구원 온실가스연구실) ;
  • 이효진 (한국에너지기술연구원 온실가스연구실) ;
  • 이창근 (한국에너지기술연구원 온실가스연구실) ;
  • 이종섭 (한국에너지기술연구원 온실가스연구실) ;
  • 민병무 (한국에너지기술연구원 온실가스연구실) ;
  • 박영철 (한국에너지기술연구원 온실가스연구실)
  • Received : 2016.12.22
  • Accepted : 2017.03.21
  • Published : 2017.06.01
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Abstract

In this study, the performance characteristics of the K-based sorbents (KEP-CO2P2, KEPCO RI, Korea) has been studied in relation with the heat exchanger structure and shape in a mixing zone of the carbonator in the bench-scale dry $CO_2$ capture process. Two types of heat exchangers (different structure and shape) were used in the carbonator as CASE 1 and CASE 2, in which the experiment has been continuously performed under the same operating conditions. During the continuous operation, working temperature of carbonator was 75 to $80^{\circ}C$, that of regenerator was 190 to $200^{\circ}C$, and $CO_2$ inlet concentration of the feed gas was 12 to 14 vol%. Especially, to compare the dynamic sorption capacity of sorbents, the differential pressure of the mixing zone in the carbonator was maintained around 400 to 500 mm $H_2O$. Also, solid samples from the carbonator and the regenerator were collected and weight variation of those samples was evaluated by TGA. The $CO_2$ removal efficiency and the dynamic sorption capacity were 64.3% and 2.40 wt%, respectively for CASE 1 while they were 81.0% and 4.66 wt%, respectively for CASE 2. Also, the dynamic sorption capacity of the sorbent in CASE 1 and CASE 2 was 2.51 wt% and 4.89 wt%, respectively, based on the weight loss of the TGA measurement results. Therefore, It was concluded that there could be a difference in the performance characteristics of the same sorbents according to the structure and type of heat exchanger inserted in the carbonator under the same operating conditions.

본 연구에서는 벤치급 건식 $CO_2$ 포집 성능평가 장치에서 흡수반응기 내부의 구조와 형태에 따른 K-계열 흡수제(KEP-CO2P2, 한국전력공사 전력연구원)의 성능특성을 확인하였다. 흡수반응기 혼합영역(mixing-zone)에 구조와 형태가 다르게 제작된 두 종류의 열교환기가 적용되었으며, 각각 CASE 1과 CASE 2로 나뉘어 동일한 조업조건으로 연속운전을 수행하였다. 연속운전동안 흡수반응 온도는 $75{\sim}80^{\circ}C$, 재생반응 온도는 $190{\sim}200^{\circ}C$, 그리고 반응기체($CO_2$) 농도는 12~14 vol%으로 설정하였다. 특히 흡수제의 흡수능 비교를 위해 흡수반응기 혼합영역의 차압을 400~500 mm$H_2O$로 유지하며 운전하였다. 또한 반응 후 채집한 시료는 반응성 비교를 위해 TGA를 이용하여 물성분석을 하였다. CASE 1 실험에서 $CO_2$ 제거효율과 동적흡수능은 각각 64.3%, 2.40 wt%으로 산출 되었고, CASE 2 실험에서 $CO_2$ 제거효율과 동적흡수능은 각각 81.0%, 4.66 wt%으로 산출되었다. 또한 반응 후 흡수제에 대한 TGA 측정 결과의 무게감량을 이용하여 흡수제의 동적흡수능을 계산한 결과, CASE 1과 CASE 2 실험에서 반응 후 흡수제의 동적흡수능은 각각 2.51 wt%와 4.89 wt%으로 산출되었다. 결론적으로 동일한 조업조건에서 흡수반응기 내부에 삽입되는 열교환기의 구조와 형태에 따라 흡수제의 성능 차이가 있는 것을 확인하였다.

Keywords

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