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Melting Characteristics of Asbestos Cement Slate on Basicity Control
윤진한(Yun, Jinhan),길상인(Keel, Sangin),민태진(Min, Taijin),이정규(Lee, Chungkyu),장두훈(Jang, Duhun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Asbestos is the collective name for a group of naturally occurring minerals in their fibrous form and hydrous silicates of magnesium and a mineral fiber that has been used commonly in a variety of building construction materials for insulation and as a fire-retardant. Asbestos has been used for a wide range of manufactured goods, because of its fiber strength and heat resistant properties. Nevertheless harmful of asbestos is quite serious. Exposure to airborne friable asbestos may result in a potential health risk because persons breathing the air may breathe in asbestos fibers. Continued exposure can increase the amount of fibers that remain in the lung. Fibers embedded in lung tissue over time may cause serious lung diseases including asbestosis, lung cancer. In this paper, we carried out as fundamental study for dispose of asbestos cement slate safely and perfectly. Melting Temperature of asbestos need to more than 1,520?C and specially asbestos cement slate need more energy than that of pure asbestos. We need to decrease melting temperature of asbestos cement slate for economical efficiency. To the purpose, glass and bottom ash were chosen as additives for basicity control. we analyzed about properties of asbestos cements slate, melting characteristics on the additives ratio and temperature. We confirmed about harmlessness of melting slag through analysis of scanning electron microscope(SEM) and x-ray diffractometer(XRD).
모사의료폐기물 성분분석을 통한 COVID-19 이후의 의료폐기물 발열량 예측 및 적정 소각방안 고찰
한소영(Soyoung Han),윤진한(Jinhan Yun),이정규(Chungkyu Lee),전민규(Mmkyu Jeon) 한국환경에너지공학회 2022 한국열환경공학회 학술대회지 Vol.2022 No.1
The armunt of nmcal waste has been increasing significantly over the past 10 years due to the increase in nursing facilities due to an aging population and the outbreak of new infectious diseases such as COVID-19. In addition, due to the fact that disposable diapers are excluded from general medical waste through the Enforcement Decree of the Waste Managerrent Act in October 2019, the ratio of wastes with concerns about infection is increasing. Since infection waste cannot be opened, this study aims to predict the calorific value and incinerate medical waste according to the high calorific value by analyzing simulated medical waste and surveying the operation status of commercial medical waste incinerators. Characteristics and calorific value of 40 types of simulated medical wastes distributed in Korea and containers for COVID-19 waste were analyzed. The sirrrulated medical waste can be divided into plastics, vinyl and synthetic resins, and textiles, and the calorific value was irradiated with an average of 9,136 kcal/kg, 10,115 kcal/kg, and 4,336 kcal/kg, respectively, and the CDVID-19 exdusive container was 10,870 kcal/kg. has a very high calorific value. As shown in the sirrrulated medical waste analysis results, it contains a lot of vinyl, synthetic resins, and plastics, so it has a high calorific value. Accordingly, it is necessary to consider an appropriate incineration plan. Low Excess Air technology, Air Staging technology, combustion l.6tm/day, a dermnstration plant with Flue Gas Recirculation technology, Auto Air Control System (AACS), real-time calorific value monitoring system according to energy recovery efficiency calculation method, and SNCR optimizatim teclmol~ It is planned to be applied to an incinerator dedicated to medical waste.
H<sub>2</sub>-공기와 CO-공기의 예혼합화염의 화염소화에 있어서 화학적 상호작용의 효과
정승욱,박정,권오붕,길상인,윤진한,Jung, Seongwook,Park, Jeong,Kwon, Ohboong,Keel, Sangin,Yun, Jinhan 한국연소학회 2013 한국연소학회지 Vol.18 No.4
Important role of chemical interaction in flame extinction was numerically investigated in downstream interaction among lean(rich) and lean(rich) premixed as well as partially premixed $H_2$-air and CO-air flames. The strain rate varied from 30 to $5917s^{-1}$ until interacting flame could not be sustained anymore. Flame stability diagrams mapping lower and upper limit fuel concentrations for flame extinction as a function of strain rate are presented. Highly stretched interacting flames were survived only within two islands in the flame stability map where partially premixed mixture consisted of rich $H_2$-air flame, extremely lean CO-air flame, and a diffusion flame. Further increase in strain rate finally converges to two points. Appreciable amount of hydrogen in the side of lean $H_2$-air flame also oxidized the CO penetrated from CO-air flame, and this reduced flame speed of the $H_2$-air flame, leading to flame extinction. At extremely high strain rates, interacting flames were survived only by a partially premixed flame such that it consisted of a very rich $H_2$-air flame, an extremely lean CO-air flame, and a diffusion flame. In such a situation, both the weaker $H_2$-air and CO-air flames were parasite on the stronger diffusion flame such that it could lead to flame extinction in the situation of weakening the stronger diffusion flame. Particular concerns are focused on important role of chemical interaction in flame extinction was also discussed in detail.
민태진(Taijin MIN),윤진한(JinHan YUN) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Pilot scale of oxygen blown high temperature gasification process using waste plastic has been studied. 0.5 ton/day of pilot scale gasification system was built, and successfully demonstrated to be operated without consumption of auxiliary fuel while preventing slag clogging. The effect of oxygen flow rate on gas composition, gas yield, and soot yield was investigated. The change of oxygen flow rate affected the change of gas composition, however hardly affect the molar ratio of [H₂]/[CO], which showed stable value at 0.6. Gas yield and cold gas efficiency showed maximum value at 0.9 of the mass ratio of oxygen to waste (O₂/waste ratio), which was 1.3 Nm³/kg-fuel and 57%, respectively. Meanwhile, carbon conversion showed maximum value of 94.2% at 1.3 of the O₂/waste ratio. The syngas from the gasification process, power generation using gas engine was successfully demonstrated.