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배중면(Joongmyeon Bae),배규종(Gyujong Bae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Pressure drop is an important design parameter for any reactor since it represents an energy loss. The objective of this study is to compare the performance of a packed-bed to a structured catalyst using microchannel. In order to analyze effect on catalyst shape, experiments were carried out with two types catalysts, packed-bed and structured catalyst which has spiral shape. When GHSV increases, the reactor using microchannel catalyst has better performance. The cause of performance difference was analysied. With pressure drop, it represents that microchannel catalyst are suitable for reformer operating high throughput, such as compact reformer.
권영진,김동연,배중면,Kwon, Youngjin,Kim, Dongyeon,Bae, Joongmyeon 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.4
The hydrogen($H_2$) is promising energy carrier of renewable energy in the microgrid system such as small village and military base due to its high energy density, pure emission and convenient transportation. $H_2$ can be generated by photocatalytic water splitting, gasification of biomass and water electrolysis driven by solar cell or wind turbine. Solid oxide electrolysis cells(SOECs) are the most efficient way to mass production due to high operating temperature improving the electrode kinetics and reducing the electrolyte resistance. The SOECs are consist of nickel-yttria stabilized zirconia(NiO-YSZ) fuel electrode / YSZ electrolyte / lanthanum strontium manganite-YSZ(LSM-YSZ) air electrode due to similarity to Solid Oxide Fuel Cells(SOFCs). The Ni-YSZ most widely used fuel electrode shows several problems at SOEC mode such as degradation of the fuel electrode because of Ni particle's redox reaction and agglomeration. Therefore Ni-YSZ need to be replaced to an alternative fuel electrode material. In this study, We studied on the Double perovskite $PrBrMnO_{5+{\delta}}$(PBMO) due to its high electric conductivity, catalytic activity and electrochemical stability. PBMO was impregnated into the scaffold electrolyte $La_{0.8}Sr_{0.2}Ga_{0.85}Mg_{0.15}O_{3-{\delta}}$(LSGM) to be synthesized at low temperature for avoiding secondary phase generated when it exposed to high temperature. The Half cell test was conducted at SOECs and SOFCs modes.
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.
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.
수중함용 2차전지-연료전지 추진체계의 성능 예측을 위한 M&S 연구
지현진,조성백,배중면,Ji, Hyunjin,Cho, Sungbaek,Bae, Joongmyeon 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.5
One of the most important devices in an underwater vessel is a propulsion system. It should be a quiet and efficient system for stealthy operations in the large mission area. Hence lead-acid battery system has been used to supply the energy to electric motor. Recent technological developments and improvements, such as polymer electrolyte membrane(PEM) fuel cell and lithium polymer battery and have created the potential to improve overall power and propulsion performance. An underwater vessel always starts their mission with a limited energy and is not easy to refuel. Therefore design of energy elements, such as fuel cell and battery, and their load distribution are important to increase the maximum operating time of underwater vessel. In this paper, the lead-acid battery/PEM fuel cell and lithium polymer battery/PEM fuel cell were suggested as propulsion system and their performances were analyzed by modeling and simulation using Matlab/Simulink. Each model concentrated on representing the characteristics of energy element depending on demand current. As a result the effect of load distribution between battery and fuel cell was evaluated and the operation time of each propulsion system was able to be estimated exactly.
수중 환경에서 고분자 전해질 연료전지(PEMFC) 공급용 수소 생산을 위한 가압 디젤 개질시스템에 관한 연구
이광호,한광우,배중면,Lee, Kwangho,Han, Gwangwoo,Bae, Joongmyeon 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.4
Fuel cells have been spotlighted in the world for being highly efficient and environmentally friendly. A hydrogen which is the fuel of fuel cell can be obtained from a number of sources. Hydrogen source for operating the polymer electrolyte membrane fuel cell(PEMFC) in the current underwater environment, such as a submarine and unmanned underwater vehicles are currently from the metal hydride cylinder. However, metal hydride has many limitations for using hydrogen carrier, such as large volume, long charging time, limited storage capacity. To solve these problems, we suggest diesel reformer for hydrogen supply source. Diesel fuel has many advantages, such as high hydrogen storage density, easy to transport and also well-infra structure. However, conventional diesel reforming system for PEMFC requires a large volume and complex CO removal system for lowering the CO level to less than 10 ppm. In addition, because the preferential oxidation(PROX) reaction is the strong exothermic reaction, cooling load is required. By changing this PROX reactor to hydrogen separation membrane, the problem from PROX reactor can be solved. This is because hydrogen separation membranes are small and permeable to pure hydrogen. In this study, we conducted the pressurized diesel reforming and water-gas shift reaction experiment for the hydrogen separation membrane application. Then, the hydrogen permeation experiments were performed using a Pd alloy membrane for the reformate gas.