미세 열전달 채널을 보유한 다관형 피셔-트롭쉬 합성 반응기의 모델링
Modeling of a modular multichannel reactor with microchannel heat exchanger for Fischer-Tropsch Synthesis
- 주제(키워드) Fischer-Tropsch Synthesis , COMSOL Multiphysics
- 발행기관 아주대학교
- 지도교수 박명준
- 발행년도 2014
- 학위수여년월 2014. 2
- 학위명 석사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000016346
- 본문언어 한국어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Fischer-Tropsch synthesis (FTS) reaction is a method for production of hydrocarbons from synthesis gas. The synthetic fuels produced via FTS have high centane numbers, low contents of sulfur and aromatics. This makes them suitable for diesel engines and friendly for environment. However, conventional FTS suffers from temperature control problems when heat removal capacity is insufficient for highly exothermic synthesis reaction (ΔHR = 165 kJ/mol), and uncontrollably high temperature can lead to the deactivation of catalysts and increase of methane selectivity by the formation of a hot-spot. Microreaction technology can help solve this limitation, since it can easily control temperature due to the extensive heat exchange surface area by high surface-to-volume ratio. Simulations can provide detailed direct information of the thermal behavior of a FTS reactor with operating conditions, while it is difficult to obtain by the experiment results in the mircoreactor of complicated structure. In the present work, a a modular multichannel reactor for FTS with Co-based catalysts was studied by three dimensional simulations. A channel type reactor with plate heat exchanger composed of several microchannels is considered and detailed modeling is conducted by COMSOL Multiphysics 4.2a (COMSOL, Inc.) with lumped kinetic models. a modular multichannel reactor is composed of three reactant flow channels located between and at both sides of reactant flow channels. Simulation result will be compared with experimental data on the reactant conversion and reactor temperature, and various operation conditions such as feed temperature, SV and reactor designs are tested. In conclusion, the developed model can allow us to gain a maximal productivity and safe operation insight into the complicated a modular multichannel reactor FTS system.
more목차
요약
그림 차례 (List of Figures)
표 차례 (List of tables)
사용기호(Nomenclature)
1. 서론
2. 촉매 제조 및 촉매 활성 실험
3. 반응속도 모델링
4. FTS 반응기 모델링
4.1 반응기 구조 및 지배 방정식
4.2 운전 조건 및 경계 조건
4.3 수치 해석 방법
5. 결과 및 고찰
5.1 실험과 시뮬레이션 결과 비교
5.2 운전 조건 변화에 따른 온도의 영향
5.3 운전 조건 변화에 따른 공간속도의 영향
5.4 냉각수 유속 변화에 따른 영향
5.5 단열 조건에서 시뮬레이션 결과 분석
5.6 반응기 운전 조건과 모듈 구성에 따른 영향
6. 결론
참고 문헌
Abstract
