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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.
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.
탄화수소 직접 내부개질에 의한 고체산화물 연료전지 운전
배규종(Gyujong Bae),김용민(Yongmin Kim),배중면(Joongmyeon Bae) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The power generation characteristics for n-butane internal reforming type SOFC cell were examined with difference SCR as a function of operation time. Relatively stable operation with slight degradation was possible at SCR=2, otherwise significant performance degradation was observed at SCR=1 and 3 due to carbon deposition and Ni oxidation, respectively. The performance degradation by fuel condition, the electrical conductivity tests with rectangular bar (Ni-YSZ cermet) under different fuels such as CH₄, n-butane and H₂ without and with steam (SCR=2) were measured as a function of exposure time. The conductivity value was significantly decreased with small fluctuation when n-butane was supplied with steam. It is considered that the external reforming should be necessary for fuels containing C₂ or higher hydrocarbons.
배규종(Gyujong Bae),배중면(Joongmyeon Bae),이동율(Dong-ryul Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study discusses about butane autothermal reforming for small scale reactor, especially by using microchannel catalyst. By mass transfer limitation, fuel conversion seriously decreases when GHSV (gas hourly space velocity, /h) increases in a packed bed reactor. In a monolith catalyst reactor, fuel conversion behavior shows dependence on catalyst thickness on the monolith and GHSV. It was mainly attributed to diffusion velocity difference between internal mass transfer and external mass transfer of catalyst particle. Significant performance improvement in metal mesh substrate was obtained compared with a packed bed.
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.