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VOC 회수를 위한 이젝터 시스템에 관한 수치모사 및 실험적 연구
김현동(Hyun Dong Kim),이동엽(Dong Yeop Lee),김윤기(Yoon Kee Kim),정원택(Won Taek Jeong),안주하(Joo Ha Ahn),김경천(Kyung Chun Kim) 한국가시화정보학회 2011 한국가시화정보학회지 Vol.9 No.2
This paper is a basic study on volatile organic compounds(VOC) recovery system in a crude oil carrier. VOC is easily evaporated in cargo tankers during loading and transportation of crude oil, causes serious environmental contamination and a huge economic loss. An ejector system is designed to mix VOC gas into crude oil flow to reduce VOC concentration. Detail two-phase flow inside the ejector is simulated using a commercial CFD code. To verify the numerical prediction, a scale-down experiment is conducted. Instead of crude oil and VOC, water and air are used as the working fluids. Flow characteristics and main parameters are obtained by two-phase flow visualization and PIV measurements. Air volume flow rate induced by the ejector is compared with respect to the volume flow rate of water using experimental and numerical results. Overall performance of the two-phase ejector predicted by the CFD simulation agrees well with that of the experiment.
질소를 이용한 200 kW MCHE 의 실험적 성능 비교 평가 연구
신정헌(Jeong-Heon Shin),윤석호(Seok Ho Yoon),이공훈(Kong Hoon Lee),최준석(Jun Seok Choi),안주하(Joo Ha Ahn),손상호(Sang Ho Sohn),김정철(Jungchul Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.4
Experiments were performed to understand the performance of 200 kW Micro Channel Heat Exchanger (MCHE) manufactured by VPE (Vacuum Process Engineering. LTD, USA). Liquid nitrogen from a 50 ton tank was supplied to hot and cold sides of MCHE for the experiment. The liquid nitrogen was vaporized at an evaporator and going through water bath heater to increase the temperature to about 80 C for hot side. In the other hand, the liquid nitrogen was going through a pump to increase the pressure and maintain sub-cooled liquid state before being supplied to cold side of the MCHE. The flow rates were varied from 591 kg/h to 2195 kg/h and from 293 kg/h to 1625 kg/h for hot and cold side, respectively. In the experiment, heat transfer coefficients of phase changed nitrogen in cold side, and the pressure drops of the flow in hot and cold side in the MCHE.