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주물공정 악취·분진 동시 처리를 위한 여과 집진장치 개발연구
허영빈 ( Rong Bin Xu ),김태형 ( Tae Hyeung Kim ),하현철 ( Hyun Chul Ha ),박승욱 ( Cheng Xu Piao ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.8
Foundry has an important economic value in the industry. However, the generation of air pollutants like particulate and odor are serious. Due to the unavoidable usage of molding sand, particulate occurs in almost all the processes. That accounts for the majority of respirable dust in the size less than 10 ㎛. As well as particulate, over 22 species of odor-causing gases and VOCs including hydrogen sulfide and ammonia are occurred. Therefore, the development of equipment that can simultaneously remove TVOC and particulate is regarded as an essential research. In this study, the spraying absorbent system was connected with the shear bag filter for the purpose to remove TVOC and particulate simultaneously. Maximization of process efficiency for the affective factors like the powder combination and injection method is conducted. The experiment was performed at the de-molding process of one foundry plant. Through these devices, the removal efficiency of more than 95% for TVOC was achieved with the absorbent that composed by 800 mesh Activated carbon (80%) and 300 mesh zeolite (20%). Also, the durability and economic evaluation were assessed. In the result of Durability assessment, the available recovery to maintain the deodorizing effect at 90% was counted to 350 degree.
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자연환기용 공장창호의 빗물유입 저감대책에 관한 실험적 연구
박승욱 ( Cheng Xu Piao ),김태형 ( Tae Hyeung Kim ),하현철 ( Hyun Chul Ha ),허영빈 ( Rong Bin Xu ) 한국산업위생학회 2010 한국산업보건학회지 Vol.20 No.3
Windows are widely used for natural ventilation of the various buildings. Especially high level windows as a part of industrial ventilation systems, play a crucial role in natural ventilation. Compared to mechanical ventilation system, natural ventilation has the advantage of lower installation and operating costs. In general, high level windows for industrial buildings have three types; louver type, 45° open type and 90° open type. Based on previous studies, it was found that the louver type and 45° open type are very effective in reducing rainwater penetration, but they did not have enough ventilation efficiencies. Preliminary tests were performed with the various types of windows. It was found that a 90˚ open double layer type window was the best among those which tested in our preliminary tests. Simulated rain was used to estimate the amount of rain penetrated through windows and to observe the paths of rain penetration. Various 90˚ open windows were tested to find the windows with minimum rain penetration and maximum ventilation efficiency.
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박승욱 ( Cheng Xu Piao ),김태형 ( Tae Hyeung Kim ),하현철 ( Hyun Chul Ha ),허영빈 ( Rong Bin Xu ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.5
Industrial natural ventilation systems consist of gravity ventilator, the high/low windows and doors. Especially, the high windows play an important role in the industrial natural ventilation systems. Generally speaking, industrial high windows are divided into 3 types; louver type, 45° open type and 90° open type. This study was numerically and experimentally conducted. Three types of windows were tested to know the ventilation characteristics and estimate the ventilation efficiencies. Numerically, computational fluid dynamics software (AIR PAK Ver. 2.0) was used to observe the flow characteristics inside the industrial building and the concentration contours generated by the tracer gas method. Experimentally, the flow visualization technique and the tracer gas method were applied with the model building to characterize the flow pattern inside the model building and to estimate the ventilation efficiencies with the different windows. It was found that 90° open type window was most effective for the discharge of pollutants from the industrial building. On the other hand, the louver type window was found to be less effective than any other windows.
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전산유체역학을 이용한 용접흄농도 간접적 예측가능성 연구
박승욱,김태형,서정윤,허영빈,임정호,강대웅,하현철,Piao, Cheng Xu,Kim, Tae Hyeung,Seo, Jeoung Yoon,He, Rong Bin,Lim, Jung Ho,Kang, Dae Woong,Ha, Hyun Chul 한국산업보건학회 2009 한국산업보건학회지 Vol.19 No.4
There are various methods for welding fume control. These methods can be divided into local exhaust system, general ventilation system and integrated control system. With the general ventilation system, we should have a good prediction tool for testing various appropriate control options. But, until now there are not many studies about how to predict the welding fume concentrations. Especially, the prediction of welding fume concentration is not a very easy task because welding fume is the particulate matters. In this study, we tried to measure $CO_2$ concentrations and welding fume concentrations in a small single room with a small ventilation opening. Using commercially available CFD (Computational Fluid Dynamics) software, we tried to predict $CO_2$ concentrations under the exactly same conditions. Then, we tried to compare the numerical $CO_2concentrations$ with the experimental results to know whether we could predict $CO_2$ concentrations. Then we tried to compare $CO_2$ concentrations with experimental welding fume concentrations to know whether we can use the numerical $CO_2concentrations$ to predict the welding fume concentration indirectly.
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