초록 ▼

2. 개발내용 및 결과
- CO₂ 흡수제 4종(P4, PL4, P4(600oC), PKM1-SU) 평가 및 PKM1-SU를 최적 흡수제로 선정
- WGS 촉매 5종(PC1~4, PC13, RSM, OBG-1, OBG-3) 평가, ShiftMax210 반응성 및 장기안전성 평가
- 고압회분식 유동층 반응기를 이용하여 유속, Steam/CO ratio, WGS 촉매 무게함량, SEWGS 온도, 재생온도 등의 조건 결정
- 기포유동층-기포유동층 형태의 공정구성 선정, 2.5 Nm3/hr급 연속공정

2. 개발내용 및 결과
- CO₂ 흡수제 4종(P4, PL4, P4(600oC), PKM1-SU) 평가 및 PKM1-SU를 최적 흡수제로 선정
- WGS 촉매 5종(PC1~4, PC13, RSM, OBG-1, OBG-3) 평가, ShiftMax210 반응성 및 장기안전성 평가
- 고압회분식 유동층 반응기를 이용하여 유속, Steam/CO ratio, WGS 촉매 무게함량, SEWGS 온도, 재생온도 등의 조건 결정
- 기포유동층-기포유동층 형태의 공정구성 선정, 2.5 Nm3/hr급 연속공정 설계, 제작, 시운전 완료. 고등기술연구원 가스화기 연계 운전조건 선정
- 모사가스가 아닌 실제 합성가스 적용 12시간 연속운전 실증
- CO₂ 흡수 단위공정이 아닌 흡수-재생 연속공정 개발
- 고등기술연구원에 5 Nm3/hr급 CO₂ 흡수-재생 연속공정 설계도 제공
- 단탑 반응기가 아닌 CO₂ 흡수-재생이 가능한 2탑 연결 연속운전 시스템 설계/제작
- 고온-고압 고체순환 35시간 (조업조건 선정, 고체순환 확인, 초기 마모입자 제거)
- 가스화-탈황-(CO₂ 흡수-재생) 연계 연속운전 8시간 (CO₂ 흡수분리효율 80% 이상)
- 가스화-탈황-SEWGS(1Nm3/hr) 연계 연속운전 12시간 (초기 CO 전환율 96% 이상, CO₂ 흡수효율 99% 이상)

Abstract ▼

To develop one loop SEWGS (Sorption Enhanced Water Gas Shift) system for pre-combustion CO₂ capture from IGCC system, fluidized bed process and operating technology have been investigated. As the first step, four kinds of CO₂ absorbents and six kinds of WGS including commercial

To develop one loop SEWGS (Sorption Enhanced Water Gas Shift) system for pre-combustion CO₂ capture from IGCC system, fluidized bed process and operating technology have been investigated. As the first step, four kinds of CO₂ absorbents and six kinds of WGS including commercial catalyst were tested using fluidized bed reactors. PKM1-SU and ShiftMax210 were selected as the best candidate for CO₂ absorbent and WGS catalyst, respectively. Effects of gas velocity, steam/CO ratio, content of WGS catalyst and temperature on catalyst reactivity and effects of temperature, steam content, CO₂ concentration, the number of cycles, and regeneration temperature on absorption-desorption characteristics of CO₂ absorbents were tested to select the best operating conditions for WGS reaction and CO₂ absorption. Based on these results, 2.5 Nm3/hr one loop SEWGS system consists of two bubbling beds was installed and effects of solid injection velocity, fluidization velocity, and solid height on solid circulation rates were tested. After that, continuous solid circulation between the one loop SEWGS system was demonstrated at different conditions including ambient temperature and pressure, ambient temperature and high pressure, high temperature and ambient pressure, and high temperature and high pressure. Finally, 5 Nm3/hr CO₂ absorption-regenration system was designed and installed based on the former results. This system was integrated with gasifier and hot gas cleanup system and continuous operation was demonstrated by using real syngas from the gasifier. We could demonstrate 35 hours steady-state solid circulation, 8 hours continuous CO₂ absorption-regeneration, and 12 hours SEWGS operation. During CO₂ absorption-regeneration tests, we could get CO₂ capture efficiency more than 80 %. Moreover, we could get very high CO conversion (>96%) and CO₂ capture efficiency (>99%) during initial SEWGS operation. Mathematical models have been developed to predict performance of a continuous entrained-bed and bubbling-bed hot gas desulfurization system and a continuous bubbling bed CO₂ capture process in IGCC. Models considered particle population balance, particle residence time, and reaction rate in each reactor. Models were applied for laboratory scale fluidized bed processes to discuss effects of process variables.