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중온 배기열을 이용한 유기랭킨사이클 작동유체별 성능특성
권동욱,허기무,윤성훈,문윤재,유호선,이재헌,Kwon, Dong-Uk,Heo, Ki-Moo,Yoon, Sung-Hoon,Moon, Yoon-Jae,Yoo, Ho-Sun,Lee, Jae-Heon 한국플랜트학회 2014 플랜트 저널 Vol.10 No.2
2012년부터 신재생에너지 의무공급제도가 국내에 도입되고, 전 세계적인 에너지 절약과 환경보존 측면에서 미활용 및 신재생에너지원에 대한 관심이 날로 증가하고 있다. 특히, 중저온 열원의 활용방안에 대하여 많은 관심과 연구가 활발하게 진행되면서 고부가가치의 전력생산이 가능한 유기랭킨사이클이 그 대안으로 떠오르고 있다. 따라서 본 연구에서는 유기랭킨사이클 발전시스템을 하수 처리장 1,500 kW 바이오가스엔진 배기열을 열원으로 하부 사이클을 구성하여 성능해석 상용 프로그램으로 성능특성을 예측하였다. 바이오가스엔진 배열의 실제 운전조건은 $460^{\circ}C$의 온도와 매 초당 2.7 kg의 유량으로 운전되고 있었다. 이러한 열원 온도에 적합한 작동유체를 다수 선정하여 작동유체 종류별 성능해석을 수행하였으며, 최고의 성능이 나타나는 이소펜탄의 경우 163.1 kW의 발전출력과 13.66%의 효율을 얻을 수 있었다. Renewable Portfolio Standards was introduced into the system in Korea in 2012. Interest in the unutilized and renewable energy sources is increasing. and these being actively investigated. An organic rankine cycle has emerged as an alternative in order to take advantage of bio-gas engine heat of sewage treatment plants whose capacity is 1500 kW. The organic rankine cycle power system was simulated by a simulator which is a commercial program of power plant design and performance analysis. The biogas engine is operated by $460^{\circ}C$ and 2.7 kg/s flow rate in the sewage treatment plant. Working fluids(R-601a, R-123, R-245fa) are selected to use in ORC power system in this temperature range. It was the isopentane that is the best performance among three working fluids. It could be obtained net power of 163.1 kW and efficiency of 13.66% from isopentane in the simulation.
V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> 촉매의 Ball Milling에 따른 산소 거동 특성 연구
권동욱,박광희,이상문,장두훈,홍성창,Kwon, Dong Wook,Park, Kwang Hee,Lee, Sang Moon,Jang, Du Hun,Hong, Sung Chang 한국공업화학회 2011 공업화학 Vol.22 No.6
Ball milling을 이용하여 제조한 $NH_3-SCR$용 $V_2O_5/TiO_2$ 촉매의 산소 거동 특성을 연구하였다. Ball milling으로 인한 촉매 $TiO_2$의 결정구조, 비표면적 변화는 없지만 $H_2-TPR$분석에서는 최대 환원온도가 저온으로 이동한다. 산소농도를 달리한 반응성 실험에서 모든 촉매는 산소가 없을 때 매우 낮은 NOx 전환율을 보이고, 산소 농도에 따라 BMC (Ball Milling Catalyst)의 활성이 더 우수한 경향을 나타낸다. 이는 격자산소와 기상산소의 반응참여 정도가 NMC (No Milling Catalyst) 보다 더 크기 때문이다. We study on the oxygen behavior of $V_2O_5/TiO_2$ catalysts in the $NH_3$-selective catalytic reduction (SCR) prepared by the ball milling processing. There are not any changes in crystal structure and surface area of the $TiO_2$ catalyst by ball milling, but the maximal reduction temperature decreased in $H_2$-temperature programmed reduction (TPR) analysis. Experimental observations with various concentrations of oxygen indicate that all catalysts showed a very low NOx conversion rate in the absence of oxygen and the reactivity of ball milled catalyst higher depending on the oxygen. It is occurred because the degree of participation of atmospheric oxygen and lattice oxygen is great than that of the not-milled catalyst.
드론의 로봇팔(RAD)을 이용한 청소 로봇의 기울어진 태양광 패널위의 랜딩 실험연구
권동욱(Dong-Wook Kwon),정슬(Seul Jung) 대한전기학회 2021 전기학회논문지 Vol.70 No.4
In this paper, the landing experiment of the Solar Panel Cleaning Robot(Dr.SPC) by a drone is presented. The robot arm for a drone (RAD) is designed to have two degrees-of-freedom to carry the cleaning mobile robot. The end-effector of the arm is equipped with an electromagnet to hold and release the robot electrically. The end-effector of the robot arm also has two ultrasonic sensors to measure the slanted angle of the panel and a camera to see the panel closely. Measuring the slanted angle of a solar panel is used for the arm to tilt the cleaning robot in parallel with the panel to minimize the contact force measured by a force sensor mounted on the first link. A drone is replaced with an x-y table for the planar motion of the arm. Actual landing experiments of Dr. SPC on the panel are conducted to test the feasibility.
권동욱(Dong-Wook Kwon),정슬(Seul Jung) 대한전기학회 2021 전기학회논문지 Vol.70 No.2
This paper presents the design and implementation of a solar panel cleaning robot, which is a tracked wheel mobile robot to move on the solar panel. In order for the robot to stick on the solar panel without sliding down, suction mechanism has been designed and implemented. The suction pad is designed to press the panel by controlling air pressure in the vacuum chamber. Since the robot has to move around on the solar panel, not only pressure control but also position control is required. To change the moving direction, body turning mechanism is employed to change the heading direction since tracked wheels have a difficulty of turning. For the heading angle control, sliding mode control is used while position is controlled by PD control. Experimental studies for the robot to move up and down on the solar panel are conducted to demonstrate the functionality of the robot.
다양한 상용 TiO2 담체의 물리화학적 특성과 Ce/Ti 촉매의 SCR 반응활성과의 상관성 연구
권동욱 ( Dong Wook Kwon ),홍성창 ( Sung Chang Hong ) 한국공업화학회 2015 공업화학 Vol.26 No.2
Ceria supported on various commercial TiO2 catalysts were prepared by wet-impregnation method. We confirmed that the correlation between physicochemical properties of TiO2 supports and SCR activities. Physicochemical properties of the various TiO2 were evaluated using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, X-ray photoelectron spectroscopy (XPS), and pH analysis. Ce/Ti catalyst exhibited different SCR activities with respect to physicochemical properties of TiO2. An excellent activity was obtained as the surface area of TiO2 increased. In the case of CeOx surface density, the excellent activity in a range of 2.5∼14.5 CeOx/nm2 was achieved and the activity tended to decrease above 14.5 CeOx/nm2. The O/Ti mole ratio of TiO2 in the range of 1.32 to 1.79 showed an excellent SCR activity. It was also confirmed that the pH of the TiO2 has no effects on the SCR activity. In order to achieve excellent SCR activities, ceria oxide should be supported on TiO2 possessing a high specific surface area and certain O/Ti mole ratio. In addition, the catalyst with the low CeOx surface density resulted from the high dispersed ceria oxide should be prepared.
사물인터넷 기반 블렌더 제어 및 알람 서비스를 위한 애플리케이션 개발
권동욱(Donguk Kwon),임완수(Wansu Lim) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.12
사물인터넷 (Internet of Things, IoT)은 디바이스들이 직접 통신을 하여 서로의 정보를 공유하는 네트워크 기술이며, 최근 다양한 산업에 응용되고 있다. 특히 가전기기와 사물인터넷의 융합은 소비자에게 신속하고 편리한 접근성을 제공하여 신 시장 창출을 주도하고 있다. 이에 본 논문은 여러 가전기기 중 사물인터넷 적용이 시작단계에 있는 주방가전에 집중하여, 주방에서 많이 사용되는 블렌더를 위한 사물인터넷 기반 애플리케이션을 개발하였다. 구현한 애플리케이션은 디지털 컨트롤러, 유지/보수 알람, 해동 알람 등 3가지 기능을 제공한다. 디지털 컨트롤러는 기존의 기계식 버튼을 이용하여 조절하는 다양한 블렌딩 방법을 애플리케이션의 버튼과 바(Bar)로 제어하는 기능을 제공하고, 유지/보수 알람 기능을 통해서는 블렌더의 블레이드, 모터 등 중요 부품의 이상 유무를 확인할 수 있으며, 해동 알람 기능은 냉동 재료 조리 시 적정 온도에서 블렌딩 할 수 있도록 온도설정을 하고 설정온도가 되면 알람이 발생하는 기능을 제공한다. The Internet of Things (IoT) interconnects every device by allowing them to communicate directly and share information with each other and has been recently applied to various industrial fields. The integration of home appliances with IoT has led to the creation of new markets by providing quick and better experience to consumers. Although IoT has been integrated into most modern day appliances, there have been few developments for kitchen appliances. This paper presents the development of integrating IoT with the blender, one of the most widely used appliance in the kitchen. A custom application was made to interact with the blender that provides three main functions: digital controller, maintenance, and defrosting alarm. The function of digital controller provides wireless control to the conventional blender. The maintenance function detects and alerts the user on blender reliability with the intent of enabling the anticipation of hardware failures. The defrost alarm alerts the user when the ingredient has reached the appropriate and desired temperature when cooking frozen food.