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고체산화물연료전지 기반 보조전원 시스템 적용을 위한 디젤 자열개질기 설계 향상
배민석(Minseok Bae),배중면(Joongmyeon Bae) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
An improved diesel autothermal reformer has been developed to integrate with a low-temperature solid oxide fuel cell stack. The design of the diesel reformer was modified to fulfill the requirements of the fuel cell stack. Sulfur removal components and heat exchangers to enhance stability and improve efficiency are introduced. To match the inlet temperature conditions of the stack, produced hydrogen-rich reformate was re-heated with the additional heat exchangers. Heat integration design between the stack and the reformer was done by thermodynamic calculations. With those improvements, a prototype of the 1 kWe Diesel reformer system has been developed and tested to validate the improvements for the low-temperature SOFC application. In result, 950 W of electricity could be produced with the system.
PEMFC용 디젤 개질 시스템에서의 일산화탄소 제거 공정 모델링
배민석(Minseok Bae),오지우(Jiwoo Oh),김동연(Dongyeon Kim),배중면(Joongmyeon Bae) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Modeling of diesel reformer system for polymer electrolyte membrane fuel cell (PEMFC) was conducted with Aspen Plus software. In order to meet the carbon monoxide (CO) level requirement of PEMFC, water-gas-shift (WGS) and preferential oxidation (PROX) reactors were introduced with the auto-thermal reforming (ATR) reactor. WGS and PROX reactors were simulated with equilibrium reactor blocks to model each chemical reaction. Various operating conditions for WGS and PROX reactors were used to control the CO amount. Especially, temperatures of each reactor and the amount of additional oxygen for PROX reactor is modified. n-dodecane and 1-methylnaphtalene were used as synthetic diesel fuel. In result, proper operating condition to meet CO level requirement for PEMFC can be obtained.
산소희박환경에서 과산화수소를 이용한 디젤개질 가능성 탐구
한광우 ( Gwangwoo Han ),배민석 ( Minseok Bae ),배중면 ( Joongmyeon Bae ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.5
잠수함 및 수중무인체계 등의 산소희박환경에서 연료전지를 통한 효과적인 전력생산을 위해서는 높은 수소저장밀도를 갖는 수소공급원이 필요하다. 디젤연료는 액체연료로서 저장 및 공급이 용이하며, 연료전지의 연료가 되는 수소의 단위질량 및 단위부피당 저장밀도가 높은 장점을 갖고 있다. 이러한 디젤연료의 장점을 기반으로 본 연구에서는 산소희박환경에서 수소생산을 위해 디젤연료의 개질반응을 이용하였으며, 산화제로 단위부피당 산소 저장밀도가 높고 액상으로 보관이 용이한 과산화수소 수용액을 기존의 산화제인 물과 산소의 대체산화제로 이용하는 방법을 제안하였다. 과산화수소 수용액의 디젤개질 산화제로써의 특성을 파악하기 위해 물, 공기 산화제와의 비교실험을 진행하였으며, 기존의 산화제와 디젤 개질반응 시 동일한 특성을 갖는 것을 실험적으로 확인하였다. 또한 상용디젤을 연료로 온도 및 과산화수소 수용액의 농도에 따른 개질성능을 평가하였으며, 49시간의 가속 열화실험을 통하여 디젤, 과산화수소 수용액을 이용한 수소생산의 가능성을 확인하였다. For effective power generation with fuel cells in low-oxygen environments such as submarines and unmanned underwater vehicles, a hydrogen source which has a high hydrogen storage density is required. Diesel fuel is easy to storage and supply due to its liquid phase and it has a high density per unit volume and unit mass of hydrogen that required for driving the fuel cells. In this paper, diesel fuel was selected as a hydrogen source for driving the fuel cell in oxygen lean environments. In addition, the aqueous hydrogen peroxide solution was suggested as an alternative oxidant for hydrogen production through the diesel reforming reaction because of its high oxygen density and liquid phase which makes it easy to storage. In order to determine the characteristics of hydrogen peroxide as an oxidant of diesel reforming, comparative experiments were conducted and it was found that hydrogen peroxide solution has the same characteristics when reformed with oxidants of both steam and oxygen. Moreover, the commercial diesel reforming performances were analyzed according to the reaction temperature and concentration of aqueous hydrogen peroxide solution. Then, through the 49 hours accelerated degradation tests, the possibility of hydrogen production via diesel and aqueous hydrogen peroxide solution was confirmed.