Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Characteristics of CaCO3 Sorbent Particles for the In-furnace Desulfurization

로 내 탈황을 위한 CaCO3 흡착제 입자의 분위기 기체와 체류 시간의 변화에 따른 특성

  • Lee, Kang-Soo (Aerosol & Particle Technology Laboratory, Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Jung, Jae-Hee (Global Environment Center, Korea Institute of Science and Technology (KIST)) ;
  • Keel, Sang-In (Environmental Systems Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Lee, Hyung-Keun (Greenhouse Gas Research Center, Korea Institute of Energy Research (KIER)) ;
  • Kim, Sang-Soo (Aerosol & Particle Technology Laboratory, Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST))
  • 이강수 (한국과학기술원 기계공학과) ;
  • 정재희 (한국과학기술연구원 환경기술연구단) ;
  • 길상인 (한국기계연구원 플라즈마자원연구실) ;
  • 이형근 (한국에너지기술연구원 온실가스연구단) ;
  • 김상수 (한국과학기술원 기계공학과)
  • Published : 2010.02.01
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Abstract

The in-furnace desulfurization technique is applied to the $O_2/CO_2$ combustion system for the carbon capture and storage (CCS) process because this combustion system does not need an additional chamber for the desulfurization. $CaCO_3$ sorbent particles, which have a wide range in size from a few nanometers to several tens of micrometers, are used for this process. In this study, an experimental system which can simulate the $O_2/CO_2$ combustion system was developed. $CaCO_3$ sorbent particles were exposed to the high temperature reactor at $1200^{\circ}C$ with various residence times (0.33-1.46 s) in air and $CO_2$ atmospheric conditions, respectively. The sorbent particles were then sampled at the inlet and outlet of the reactor and analyzed qualitatively/quantitatively using SMPS, XRD, TGA, and SEM. The results showed that the residence time and atmospheric condition in a high temperature reactor can affect the characteristics of the $CaCO_3$ sorbent particles used in the in-furnace desulfurization technique, such as the calcination rate and reaction mechanism.

추가적인 챔버를 필요로 하지 않는 로 내 탈황 기술은 순산소 연소 기술에 적용 가능할 것으로 기대되어 많은 연구가 진행중이다. 이때, 수 나노부터 수십 마이크로미터의 넓은 사이즈 분포를 가지는 $CaCO_3$ 입자가 흡착제로써 사용된다. 본 연구에서는 순산소 연소 시스템을 모사하는 랩스케일의 실험 장치를 구축하였다. $CaCO_3$ 흡착제 입자는 $1200^{\circ}C$로 설정된 고온 반응로에 각각 공기 분위기와 CO2 분위기에서 노출되게 된다. 이때 고온 반응로에서의 체류 시간을 0.33 ~ 1.46 초로 변화시켜 가면서 분석을 수행하였다. 흡착제 입자는 고온 반응로의 전단과 후단에서 각각 포집되어 주사형 이동도 입자계수기, X-선 회절장치, 열중량 분석기, 주사전자현미경 등을 사용하여 정성적/정량적으로 분석하였다. 결과적으로, 고온 반응로에서의 체류 시간과 분위기 기체성분이 흡착제 입자의 하소 반응률, 반응 메커니즘 등에 영향을 미침을 확인하였다.

Keywords

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