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Received September 5, 2017
Accepted November 29, 2017
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코크 생성 억제를 위한 이산화탄소 건식 개질 반응기의 최적 설계
Optimal Design of Carbon Dioxide Dry Reformer for Suppressing Coke Formation
1한국화학연구원 CO2에너지벡터연구그룹, 34114 대전광역시 유성구 가정로 141 2충남대학교 에너지과학기술학과, 34134 대전광역시 유성구 대학로 99 3충남대학교 응용화학공학과, 34134 대전광역시 유성구 대학로 99
1Korea Institute of Chemical Technology, CO2 EnergyVector Research Group, 141, Gajeong-ro, Yuseong-gu, Daejeon, 34114, Korea 2Department of Energy Science and Technology, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34134, Korea 3Department of Chemical Engineering & Applied Chemistry, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34134, Korea
mwhan@cnu.ac.kr
Korean Chemical Engineering Research, April 2018, 56(2), 176-185(10), 10.9713/kcer.2018.56.2.176 Epub 5 April 2018
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Abstract
지구 온난화가 가속화됨에 따라 온실가스 감축이 보다 중요해졌다. 이산화탄소 건식 개질은 온실가스인 CO2와 CH4를 활용하여 부가가치가 높은 물질인 CO와 H2를 얻을 수 있는 유망한 온실가스 감축 기술이다. 그러나 이 반응이 일어나는 반응기의 운전 중에 심각한 코킹 문제가 발생할 수 있다. 이산화탄소 개질반응은 매우 강한 흡열반응이기 때문에 반응기 입구 근처에서 반응 온도가 많이 떨어지면서 코크 생성을 야기시킨다. 이러한 문제를 해결하기 위해서는 코크 생성이 잘 일어나지 않는 온도영역에서 반응이 일어나도록 하는 것이 중요하다. 본 연구에서는 새로운 촉매 배열 방법을 이용하여 반응기 전 구간이 코크 생성이 잘 일어나지 않는 온도 영역 내에서 유지되도록 하는 설계 방법을 제안하였다. 이 설계 방법은 연료 유량, 촉매 밀도, 구간 별 출구 온도를 최적화 변수로 하여 주어진 전환율에 대하여 반응기 길이를 최소화 할 수 있는 최적화 문제를 풀도록 하여 반응기를 최적화한다.
As global warming accelerates, greenhouse gas reduction becomes more important. Carbon dioxide dry reforming is a promising green-house gas reduction technology that can obtain CO and H2 which are high value-added materials by utilizing CO2 and CH4 which are greenhouse gases. However, there is a significant coking problem during operation of the dry reforming reactor. Because the carbon dioxide dry reforming is a strong endothermic reaction, the temperature of the reactor drops near the reactor inlet and causes coke formation. To solve this problem, it is important to ensure that the reaction takes place in a temperature range where coke production is minimized. In this study, we proposed a design method that can maintain reaction temperature in the region where the coke is rarely generated by using the new catalyst configuration method. The design method also optimizes the reactor by solving the optimization problem which minimizes the reactor length for a given reaction conversion by using the fuel flow rate, catalyst density, and output temperature by section as optimization variables.
Keywords
References
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