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글라이딩 아크플라즈마 개질기에서 하수 슬러지 타르 중 벤젠의 분해
김록호 ( Rhok Ho Kim ),백원석 ( Won Suk Baek ),전영남 ( Young Nam Chun ) 조선대학교 공학기술연구원 2011 공학기술논문지 Vol.4 No.3
Thermal decomposition/gasification technology utilizes an energy conversion technique from various waste resources, such as biomass, solid waste, sewage sludge, etc for generating syngas. However, during the process of thermal decomposition of gases tar might cause the damage and create operating problem. In this study, a gliding arc plasma reformer was developed to solve the previously acknowledged issues. In addition, the experiments were conducted to authenticate the optimal operating conditions on the variables that can affect the removal efficiency. The optimal operating condition are 2 of Steam/ Carbon ratio for steam input amount, 0.98 kWhn-3 of SEI for specific energy input, 14 L/min of a total gas amount, 3.6% of initial benzene concentration, 300℃ of input temperature, 1.5 mm of nozzle diameter, 3 mm of electrode gap distance and 95 mm of electrode length. In this case, the maximum benzene decomposition efficiency and energy efficiency are about 95% and up to 120 g/kWh, respectively.
하수슬러지 건조를 위한 로터리킬른 건조로의 내부 열유동에 관한 수치해석 연구
김승호 ( Seung Ho Kim ),김록호 ( Rhok Ho Kim ),전영남 ( Young Nam Chun ) 조선대학교 공학기술연구원 2011 공학기술논문지 Vol.4 No.3
The drying process is one of the way to manage sewage sludge that ha low organic matter content and high percentage of moisture content. In order to achieve the efficiency of drying process, the suitable dryer should be used. In this study, an effort was made to develop the suitable rotary kiln dryer for sewage sludge. Numerical simulation of the thermal fluid flow was conducted in the dryer to dry the sewage sludge. It was also conducted in the various operation flexible conditions. The result shows that temperature distributed evenly in the rotary kiln dryer. The influence of heat-fluid flow on the surface of the wall had long resistence time. The long resistence has time increased the efficiency of drying process because heat contacted with sewage sludge more frequently. It must be noted that the deflector and the cylinder core stimulated heat rotation. The velocity of combustion gas had impact on the efficiency of drying process, as the Iow velocity slowed down the heat rotation ultimately hindering the drying process. This might suggest that when the velocity was 2 m/s, the efficiency of drying process increased significantly. However, resistence time is short and panicle matter is scattering. which is uneconomical. It was found that when the temperature of combustion gas was 600℃ the temperature distribution around the main drying zone a ranged from 3800 to 450" indicating the most suitable temperature to perform the drying process for bound water surface.