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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 22, 2021
Accepted May 25, 2021

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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CFD를 이용한 진공가압함침공정 내 유해가스 배출시스템 설계

Design of Hazardous Fume Exhaust System in Vacuum Pressure Impregnation Process Using CFD

장준규^{1 2} 유 엽^{1 3} 박현도^{1 3} 문 일³ 임백규^4† 김정환^1† 조형태^1†

Jungyu Jang^{1 2} Yup Yoo^{1 3} Hyundo Park^{1 3} Il Moon³ Baekgyu Lim^4† Junghwan Kim^1† Hyungtae Cho^1†

¹한국생산기술연구원 친환경재료공정연구그룹, 44413 울산광역시 중구 종가로 55 ²동국대학교 화공생물공학과, 04620 서울시 중구 필동로 1길 30 ³연세대학교 화공생명공학과, 03722 서울시 서대문구 연세로 50 ⁴㈜엠벡, 44428 울산광역시 중구 종가로 362-11

¹Green Materials and Processes R&D Group, Korea Institute of Industrial Technology, 55, Jongga-ro, Jung-gu, Ulsan, 44413, Korea ²Department of Chemical and Biochemical Engineering, Dongguk University, 30, Pildong-ro 1-gil, Jung-gu, Seoul, 04620, Korea ³Department of Chemical and Biomolecular Engineering, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Korea ⁴MVEC Co., Ltd., 362-11, Jongga-ro, Jung-gu, Ulsan, 44428, Korea

htcho@kitech.re.kr

Korean Chemical Engineering Research, November 2021, 59(4), 521-531(11), 10.9713/kcer.2021.59.4.521 Epub 2 November 2021

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Abstract

진공가압함침공정(Vacuum Pressure Impregnation, VPI)은 발전기, 전동기 등 대형 회전기에 사용되는 고정자 권선에 에폭시 계열의 레진을 코팅시켜 물성을 강화하는 공정이다. VPI 공정 중 진공과 가압과정에서 에폭시 레진의 기화에 의해 레진 가스가 발생하고, 함침공정이 끝나고 경화를 위해 탱크 개방 시 레진 가스가 제거되지 않고 탱크 밖으로 유출된다. 유출된 레진 가스가 작업장 전체에 확산 시 화재, 폭발 및 호흡기 문제와 같은 안전 환경 문제가있으므로 공정 내 레진 가스 배출시스템이 필요하다. 따라서, 본 연구에서는 VPI 공정에서 발생한 레진 가스를 배출하는 시스템을 설계하기 위해 전산유체역학(Computational Fluid Dynamics, CFD)을 이용하여 공기 유입구·배출구의 위치에 따른 배출효율에 대한 사례연구를 진행하였다. 본 연구의 최적의 배출시스템을 활용 시 1,800초 이내 90%이상의 레진 가스를 배출할 수 있으며, 레진 가스의 폭발하한계(Low Explosive Limit, LEL)이하로 레진 가스의 분율을 낮출 수 있었다.

Vacuum Pressure Impregnation (VPI) is a process that enhances physical properties by coating some types of epoxy resins on windings of stator used in large rotators such as generators and motors. During vacuum and pressurization of the VPI process, resin gas is generated by vaporization of epoxy resin. When the tank is opened for curing after finishing impregnation, resin gas is leaked out of the tank. If the leaked resin gas spreads throughout the workplace, there are safety and environmental problems such as fire, explosion and respiratory problems. So, exhaust system for resin gas is required during the process. In this study, a case study of exhaust efficiency by location of vent was conducted using Computational Fluid Dynamics (CFD) in order to design a system for exhausting resin gas generated by the VPI process. The optimal exhaust system of this study allowed more than 90% of resin gas to be exhausted within 1,800 seconds and reduced the fraction of resin gas below the Low Explosive Limit (LEL).

Keywords

Vacuum pressure impregnation Computational fluid dynamics Fume Epoxy resin

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