• Korean Chemical Engineering Research
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• 제56권6호
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• pp.871-877
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• 2018

전 세계적으로 재생에너지의 비율이 증가함에 따라, 재생에너지로부터 생산되는 불연속적이고 간헐적인 에너지 저장 문제가 주목을 받고 있다. 다양한 에너지 저장 시스템(ESS) 중에서 $CO_2$ 메탄화 기술은 타 시스템에 비해 높은 저장 용량과 저장 기간으로 각광 받고 있다. $CO_2$ 메탄화 반응은 발열반응이며, 촉매가 낮은 온도 범위($250-500^{\circ}C$)에서 높은 활성 및 메탄 선택도를 갖는다. 기존의 고정층 방식에 비하여 유동층 반응기는 높은 열전달 특성으로 인해 발열반응에 적합하며, 열전달과 물질 전달이 유리한 장점을 갖고 있다. 본 연구에서는, 촉매 특성 평가를 위해 기포유동층 반응기(Diameter: 0.025 m, Height: 0.35 m)와 $Ni/{\gamma}-Al_2O_3$ (Ni 70% and ${\gamma}-Al_2O_3$ 30%) 촉매를 사용하였다. 반응 조건은 $H_2/CO_2$ mole ratio: 4.0-6.0, 조업온도 $300-420^{\circ}C$, 조업 압력 1-9 bar 및 $U_o/U_{mf}$ 1-5이었다. 생성 가스의 조성은 NDIR를 통해 분석하였으며, $CO_2$ 전환율은 $H_2/CO_2$ ratio, 압력, 온도가 증가함에 따라 높아지는 경향을 보였다. 이에 반해 가스유속이 빨라질수록 $CO_2$ 전환율은 떨어졌다. 최적의 운전 조건은 $H_2/CO_2$ ratio: 5, 조업온도 $400^{\circ}C$, 조업 압력 9 bar 및 $1.4-3U_{mf}$이었으며 이 때 $CO_2$ 전환율은 99.6%로 나타났다. 본 실험 촉매의 경우 장기 운전 시 촉매 성능 저하가 없이 $CO_2$ 전환율이 일정하게 유지하는 것을 확인하였다.

• 한국수소및신에너지학회논문집
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• 제16권3호
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• pp.209-218
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• 2005

To find a suitable metal component in oxygen carrier particles for chemical-looping hydrogen generation system(CLH), oxygen transfer capacities of metal components were compared and Ni has been selected as the best metal component. The proper operating conditions to achieve high hydrogen generation rate have been investigated based on the chemical-equilibrium composition analysis for water splitting reactor. Moreover, suitable compositions of syngas from gasifier of heavy residue to achieve high energy efficiency have been investigated by calculation of heat of reaction. Based on the selected operating conditions, the best configuration of two interconnected fluidized beds system for the chemical-looping hydrogen generator has been investigated as well.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.383-386
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• 1997

Electrostatic suspension is a method to levitate an object by using electrostatic forces. Its main advantage is to levitate objects without any mechanical contact which fulfills the requirement of an object handling in ultra clean environment. In this paper, the electrostatic suspension system for film-like thin plate such as aluminum sheet, is designed and controlled. In contrast with the conventional electrostatic suspension system which requires the costly and bulky high-voltage amplifiers, it is suggested to use the switching voltage control method in consideration of real industrial application for the handling of such flexible bodies. Some experimental results show that the developed electrostatic suspension system shows good performances to levitate flexible film-like thin plate.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2004년도 추계학술대회 학술발표 논문집 제14권 제2호
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• pp.67-70
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• 2004

Semiconductor Wet Station has a very important place in semiconductor process. It is important that to discharge chemical with fit concentration and temperature using chemical supply system for clean process. The chemical supply system which is used currently is not only difficult to make a fit mixing rate of chemical which is need in clean' process, but also difficult to make fit concentration and temperature. Moreover, it has high stability but it is inefficient spatially because its volume is great. We propose In-line System to improve system with implement analysis of fluid and thermal transfer on chemical supply system and understand problem of system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1723-1726
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• 2003

Clean and well maintained roadway signs are important for preserving driver's safety. The existing signs on the roadway must be periodically re-painted in order to maintain clean state. However, current sign painting operations are manually performed now. These are very slow and workers are exposed to very dangerous and hazard working environment. In this paper, we present the method for automating this job with gantry robot and spray system. In addition, we suggest two design concepts to resolve the problem that it is impractical to make the gantry system so big as to cover whole lane width. In order to show the validity of this system, the painting operation is simulated and experimentally executed.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.443-446
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• 2006

For the satisfaction of the high engine performance and the low radiated sound pressure simultaneously, the duct length in the vehicle intake/exhaust system should be tuned carefully in the design and development stage of a vehicle. This study was concerned about the effects of intake duct length in clean and dirty sides on the radiated sound emitted from an inlet. An index derived from the existing prediction model of radiated sound pressure was employed to determine which duct was more influential to the radiated sound. Comparing the experimental and predicted results, we found that the change of dirty-side duct length caused a larger change than that in the clean side in the radiated sound level from a tested intake system.

• 한국수소및신에너지학회논문집
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• 제16권2호
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• pp.111-121
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• 2005

이 연구는 광화학적 물분해 수소제소 기술의 일환으로 수행 중인 광촉매와 바이오촉매를 복합한 시스템 활용 기술에서 광촉매가 갖는 물리적 특성의 영향을 파악하고자 진행되었다. 다양한 물리적 특성을 갖는 광촉매 얻기 위하여 상용광촉매, 수열화법(HT-TiON), 리고 저온합성법(LT-TiON) 등을 이용하여 샘플을 준비하였다. 가시광 감응을 위하여 암모니아나 triethylamine 처리를 하여 질소를 도핑도 시도하였다. 시도된 복합시스템은 인위적인 전자주개 없이 수소를 발생시키는 결과를 보여주었으나, 광촉매로부터 엔자임으로의 전자전달 부분이 율속단계로 확인되었다. 사용된 광촉매 샘플에 따라 수소발생량에 차이가 나타난 결과로 광촉매의 미세구조 (결정상, 결정도, 기공 크기 및 비표면적 등)이 중요한 역할을 하는 것으로 판단되었다. 얻어진 결과들을 활용하여 재료들이 고정화된 새로운 시스템 구성을 제안하였다.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2004년도 추계학술논문발표회 논문집
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• pp.10-18
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• 2004

• 대한설비공학회지:설비저널
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• 제20권6호
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• pp.391-408
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• 1991

• 설비공학논문집
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• 제25권1호
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• pp.7-13
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• 2013

Bio Clean Room(BCR) and pharmaceutical product manufacturing facilities require careful assessment of many factors, including HVAC, controls, room finishes, process equipment, room operations, and utilities. Flow of equipment, personnel, and product must also be considered along with system flexibility, redundancy, and maintenance shutdown strategies. It is important to involve designers, operators, commissioning staff, quality control, maintenance, constructors, validation personnel, and the production representative during the conceptual stage of design. Critical variables for room environment and types of controls vary greatly with the clean space's intended purpose. It is particularly important to determine critical parameters with quality assurance to set limits and safety factors for temperature, humidity, room pressure, and other control requirements. In this paper, oxygen cluster ion equipment was utilized in order to enhance the indoor air quality and to prevent the airborne infection of ward in hospital. Moreover, the performance test of the equipment was also performed in order to develop the optimal sterilization system of BCR using the equipment.