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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.
스윕 가스-진공 하이브리드식 탈기막 공정을 활용한 암모니아 폐수처리 및 선택적 회수
윤홍식 ( Hongsik Yoon ),민태진 ( Taijin Min ),전민규 ( Minkyu Jeon ),임성일 ( Sungil Lim ),오세철 ( Sechul Oh ),류경하 ( Kyungha Ryu ),이충성 ( Chungsung Lee ),강보식 ( Bosik Kang ) 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.6
In this study, a sweep gas - vacuum hybrid type membrane degassing process was proposed for ammonia wastewater treatment. In addition, the ammonia selective recovery of the hybrid type membrane degassing process was also investigated. As a result, the hybrid type membrane degassing process showed better degassing performance (54.9 mg NH<sub>3</sub>/m<sup>2</sup>min for 360 min) than the sweep gas type (32.3 mg NH<sub>3</sub>/m<sup>2</sup>min) or vacuum type (22 mg NH<sub>3</sub>/m<sup>2</sup>min). Additionally, the hybrid type membrane degassing process showed an excellent ammonia selectivity (103 times compared to Na<sup>+</sup>, 133 times compared to Ca<sup>2+</sup>). The ammonia selectivity was appeared to be due to the conversion characteristics of ammonium ion / dissolved ammonia depending on pH. The results in this study are expected to be used in the development of ammonia wastewater treatment and ammonia recovery in the future.
스윕 가스-진공 혼합식 탈기막 시스템을 활용한 암모니아 제거
윤홍식,민태진,이건희,김형탁,신완호,Yoon, Hongsik,Min, Taijin,Lee, Gunhee,Kim, Hyoung-Tak,Shin, Wanho 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.5
In this study, the membrane degassing process of the sweep gas - vacuum combination type was proposed for ammonia wastewater treatment. The effect of pH, initial ammonia concentration and scale-up on ammonia degassing performance was investigated. As a result, as the pH and the initial ammonia concentration increased, the degassing permeate flux was improved. On the other hand, the ammonia mass transfer coefficient increased as the initial ammonia reduced, which seems to be due to the driving force of the sweep gas-vacuum combination type membrane degassing system proposed in this study. In addition, 80 mg NH<sub>3</sub>/min of the ammonia degassing rate was achieved using a 6×28 inch size module. Better degassing performance is expected if consideration for maintaining vacuum pressure is involved in the scale-up design.
칼슘알지네이트 이온교환막을 활용한 경도 제거용 축전식 탈염 기술 개발
윤홍식 ( Hongsik Yoon ),민태진 ( Taijin Min ),이건희 ( Gunhee Lee ),박인용 ( Inyong Park ),한방우 ( Bangwoo Han ),강보식 ( Bo Sik Kang ),류경하 ( Kyungha Ryu ),이지호 ( Jiho Lee ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.5
In this study, calcium alginate based cation exchange membrane was prepared and used to develop membrane capacitive deionization (MCDI) system for effective hardness control. As a major result, the MCDI with Ca-alginate membrane showed 27% better deionization capacity than the MCDI with a commercial cation exchange membrane. This superior improvement in the deionization capacity was expected to be due to the high ratio of transport number/electrical resistance (S<sub>c</sub>/R<sub>ratio</sub>) of Ca-alginate membrane. In addition, the MCDI with Ca-alginate membrane showed better deionization performance than the MCDI with Ca-alginate coating. This was because the space between the electrode and the Ca-alginate membrane was utilized for ion adsorption. The preliminary results indicated that the MCDI with Ca-alginate membrane can be a viable technique for the hardness control.
Ru/Al₂O₃ 촉매를 이용한 바이오매스 타르 개질 특성
박영수(Yeongsu Park),김우현(Woohyun Kim),길상인(Taijin Min),윤진한(Jinhan Yun),민태진(Sangin Keel),노선아(Seonah Roh) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Biomass gasification is a promising technology for producing a fuel gas which is useful for power generation systems. In biomass gasification processes, tar formation often causes some problems such as pipeline plugging. Thus, proper tar treatment is necessary. So far, nickel (Ni)-based catalysts have been intensively studied for the catalytic tar removal. However, the deactivation of Ni-based catalysts takes place because of coke deposition and sintering of Ni metal particles. To overcome these problems, we have been using ruthenium (Ru)-based catalyst for tar removal. It is reported by Okada et al., that a Ru/Al2O3 catalyst is very effective for preventing the carbon deposition during the steam reforming of hydrocarbons(1-3). Also, this catalyst is more active than the Ni-based catalyst at a low steam to carbon ratio (S/C) (4). Benzene was used for the tar model compound because it is the main constituent of biomass tar (5) and also because it represents a stable aromatic structure apparent in tar formed in biomass gasification processes. The steam reforming process transforms hydrocarbons into gaseous mixtures constituted of carbon dioxide (co₂), carbon monoxide (CO), methane (CH4) and hydrogen (H2).
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).