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회전반응로형 가축분뇨 퇴비화 공정을 통한 암모니아 발생가스 저감 특성 연구
장지훈,옥용호,양고수 한국환경기술학회 2019 한국환경기술학회지 Vol.20 No.6
A Rotary Kiln furnace with a 1-ton scale production capacity, which is about 50 batches based on 20 kg weight per 1 composting batch, was constructed to analyze odor (ammonia) generation characteristics and mitigation strategies. The amount of compost fed into the reactor was 450 ~ 500 kg/batch. Hot air at 200~100 was injected into the reactor at a 3~5 m3/hr airflow rates early composting fermentation conditions. The temperature and moisture content in the furnace were measured to adjust the temperature and flow rate of the blowing air to maintain the conditions. The temperature of the compost in the reactor began to rise one day after injecting hot air and reached a maximum temperature of 80 ℃ after 48 hours. It gradually dropped after about four days and reached 63 ℃. Then, the temperature was maintained at about 58 ℃ after eight days. The moisture content was maintained at 42.6 ~ 51.2 % during the fermentation period and the ammonia concentration rapidly increased to 700~100 ppm after hot air was injected. It decreased after reaching the highest temperature and an air temperature of 63 ℃, at which time the ammonia concentration was 200~50 ppm, which was 1/10 of the highest value. Ninety-eight percent or more of the odor (ammonia gas) was efficiently removed by using citric acid and 0.3 M potassium permanganate as the absorbing solution, which was higher than when an aqueous solution was used as the absorbing solution. The odor removal (ammonia gas) efficiency using 0.3 M citric acid absorbent was relatively high (> 98 %) and particulate ammonium citrate was formed as a byproduct, indicating the potential for recycling as fertilizer.
바이오매스 스토커 소각로 운전 조건이 배출구에서 배출되는 악취물질 농도에 미치는 영향 연구
장지훈,양고수,옥용호 한국냄새환경학회 2019 실내환경 및 냄새 학회지 Vol.18 No.4
The emission of odor, characterized by the combustion conditions and biomass types resulting from the use of a biomass incinerator, was analyzed. The following biomass types were considered: bark, board waste, sawdust, wood flour, wood fiver, wastewater sludge, and timber wastewater. As a study method, the physico-chemical characteristics of each biomass type were analyzed to predict the potential substances that might be emited under incomplete combustion conditions. And, the emission components of odor emission by biomass were analyzed at the laboratory level using a combustion device. In addition, the characteristics of the contaminant (odor) emission per mixture ratio of biomass were analyzed in a stoker incinerator that is in operation in an actual establishment at a scale of 300 ton/day. In the biomass emission experiment using the combustion device at the laboratory level, the major substances such as Acetic acid, Styrene, Toluene, Benzene, Dichloromethane, etc. were analyzed, and these components were determined to increase odor index. VOCs measurement in the outlet of the stoker incinerator indicated that Acetaldehyde, Ethanol, Acetonitrile, Ethyl acetate, Toluene, etc. were detected as the major substances. These were similar to the emission substances presented by the experiment that had investigated emissions by biomass type. A study on the Effect of Operational Conditions in biomass stocker incinerator on the concentration of odorous materials emitted from stack showed a close relationship between the input by biomass type and urea, temperature in the incinerator, and the tendency to emit/produce odor.
불평형 부하에서의 초전도케이블 운전 및 냉각부하 특성에 관한 연구
손송호(S. H. Sohn),임지현(J. H. Lim),양형석(H. S. Yang),최하옥(H. O. Choi),마용호(Y. H. Ma),김동락(D. L. Kim),류희석(H. S. Ryoo),류경우(K. W. Ryu),황시돌(S. D. Hwang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Demonstrations to deploy high temperature superconducting (HTS) cable to the real gird are actively carried out throughout the world. Power utilities have an interest in the inherent advantage of the HTS cable system, and achieve the expected results from the series of verification test. To embody the reliability in the phenomenon occurred commonly in three-phase system, we simulate the load unbalance. A 22.9 ㎸ large scale HTS cable system with the specification of 100 m-long, 50 ㎹A capacity has been tested with up to 30% unbalance rate. To evaluate the effect of AC loss increase due to the unbalanced load, the cooling loads are measured by the calorimetry method. In this paper, the correlation between AC loss and load unbalance is described and investigated precisely.
Current Transport Characteristics of 22.9 ㎸ High Temperature Superconducting Cable System
손송호(S. H. Sohn),임지현(J. H. Lim),류희석(H. S. Ryoo),양형석(H. S. Yang),최하옥(H. O. Choi),마용호(Y. H. Ma),김동락(D. L. Kim),류경우(K. W. Ryu),성태현(T. H. Sung),현옥배(O. B. Hyun),임성우(S. W. Lim),황시돌(S. D. Hwang) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.7(초록집)