연면방전에 의한 질소산화물의 분해시 전극재질의 영향

安亨煥,姜賢春 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-

본 연구에서는 특수 설계된 연면방전(Surface discharge induced Plasma Chemical Process, SPCP) 반응기로부터 발생되는 플라스마에 의하여 일산화질소(NO)와 이산화질소(NO_2)등 유해 환경오염 가스를 주파수, 유량, 농도,전극재질 및 감은횟수등의 공정변수 변화에 따른 분해율, 소비전력 및 소비전압 등을 측정하여 최적의 공정조건과 최대의 분해효율을 얻고자 하였다. 표준시료로서 일산화질소와 이산화질소를 고전압발생기의 주파수(5∼50 ㎑), 유해가스의 체류시간(1∼10.5초)과 초기농도(100∼1000 ppm), 전극의 재질(W, Cu, Al), 전극의 굵기(1, 2, 3 mm) 및 감은횟수(7회, 9회, 11회)에 대하여 플라즈마 연면방전 반응기를 이용하여 분해효율을 구하였다. 유해가스(NO, NO_2)의 분해제거 실험결과, 10㎑의 주파수와 각각 19.8와 20W의 소비전력에서 각각 94.3, 84.7%로 가장 높은 분해제거율을 나타내었고,20㎑이상에서는 주파수가 커질수록 분해율이 감소하였다. 또한 연면방전 반응기에서 유해가스의 체류시간이 길수록, 그리고 초기농도가 작을수록 분해율은 증가하였다. 방전방극에 대한 영향은 전극의 굵기가 굵을수록 분해율이 증가하여 본 실험의 경우 3mm의 전극을 사용하였을 때 가장 높은 분해율을 나타내었고, 전극의 재질은 텅스텐을 사용하여 방전한 경우에 가장 높은 분해율을 보였으며 구리, 알루미늄의 순으로 낮아졌다. 방전전극의 감은횟수에 대한 성향은 7회, 9회, 11회의 순으로 감은횟수가 많을수록 분해율이 높아짐을 알 수 있었다. For hazardous air pollutants(HAP) such as NO and NO_2 decomposition efficiency power consumption, and applied voltage were investigated by SPCP(surface induced discharge plasma chemical processing) reactor to obtain optimum process variables and maximum decomposition efficiencies. Decomposition efficiency of HAP with various electric frequencies(5∼50㎑), flow rates(100∼1,000 mL/min), initial concentrations(100∼1,000 ppm), electrode materials(W, Cu, Al), electrode thickness(1, 2, 3 min) and number of electrode windings(7, 9, 11) were measured. Experimental results showed that for the frequency of 10 ㎑, the highest decomposition efficiency of 94.3% for NO and 84.7% for NO_2 were observed at the power consumptions of 19.8 and 20W respectively and that decomposition efficiency decreased with increasing frequency above 20 ㎑.Decomposition efficiency was increased with increasing residence times and with decreasing initial concentration of pollutants. Decomposition efficiency was increased with increasing thickness of discharge electrode and the highest decomposition efficiency was obtained for the electrode diameter of 3 mm in this experiment. As the electrode material decomposition efficiency was in order : tungsten(W), copper(Cu), aluminum(Al).

가정 내 가스사용자의 안전의식 조사

안형환 한국교통대학교 2018 한국교통대학교 논문집 Vol.53 No.-

This study was investigated about safety awareness of gas users at home. The safety awareness includes respondents' awareness on risks of gas accidents, how to use fire extinguishers, the existence, status and kinds of them, degree of interest in installments of gas accidents prevention and evacuation methods in case of fire. In results, most of gas users have been found to have high awareness on the risks, existence and how to use fire extinguishers. However, education and promotion on gas accidents will be needed on the rest of the areas.

산업부문별 산업재해의 연도별 경향에 관한 연구

안형환 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.1

In this paper, industry are devided to mining, manufacturing, electricity ·gas · water, transport · storage · communication, construction, and others. In the case of an increasing ratio of deaths, it was showed a pattern that others > constrution > manufacturing > minig > transport · storage · communication > electricity · gas · gas · water. Especially, others and construction showed many better increasing ratio than other. In the case of dangerous degree by industrial department, it was showed a pattern that mining > transport · storage ·communication > construction > electricity · gas ·water > manufacturing > others. Especially, minig was showed very dangerous degree.

식품분진의 폭발 특성과 발화온도에 관한 연구

安亨換 대한안전경영과학회 2001 대한안전경영과학회 학술대회논문집 Vol.2001 No.05

A study for the dangerous properties measurment of dust explosion was attended by the various dust concentration on Anthraquinone, Sodiumbenzoic acid, Corn starch, soy sauce powder, and cheese powder. As the result, maximum explosion pressure, the maximum rate of pressure rise, autoigntion temperature, and the water content of dust on lower limit explosion concentration was obtained as follows 1. The lower limit explosion concentration on soy sauce powder with the humidity of 65 to 90% increased by increasing the con tent of moisture, and the effect of dry air and moisture air decreased better in make of dry air. 2. The effect of a various dust concentration on autoigntion temperatures is investigated, If the vessel of dust explosion is small size and the easiness of autoignition was controled by air within the vessel, because it was better decreased air with increasing of dust concentration 3. The maximum explosion pressures of Anthraguinone, sodiumbenzoic acid, com starch, soy sauce powder, and cheese powder were 1.0g/l, 1.0g/l, 1.5g/l, 1.5g/l, and 1.5g/l, respectively, and the maximum rate of pressure rise were 0.5g/l, 0.5g/l, 1.0g/l, 1.0g/l, and 1.0g/l, respectively.

SPCP에 의한 CFC의 분해에 관한 연구

安亨煥,姜賢春 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-

For hazardous air pollutant(HAP) CFC, decomposition efficiency power consumption,and applied voltage were investigated by SPCP(Surface induced discharge Plasma Chemical Processing) reactor to obtain optimum process variables and miximum decomposition efficiencies. Decomposition efficiency of HAP with various electric frequencies (5∼50㎑),flow rates (100∼1,000㎖/min), initial concentrations (100∼1,000ppm), electrode materials(W, Cu, Al), electrode thickness (1, 2, 3 mm) Number of electrode windings(7, 9, 11), base gases (N2, O2, air), simulated gas(CO_2), and additive(CH_4) were measured and the products were analyzed with FT-IR. Experimental results showed that for the frequency of 10㎑, the decomposition efficiency of 92.7%(29.6w), and that decomposition efficiency decreased with increasing frequency above 20㎑. Decomposition efficiency was increased with increasing thickness of discharge electrode and the highest decomposition efficiency was obtained for the electrode diameter of 3㎜ in this experiment. When the additive of CH_4 was used, decomposition efficiency was increased with increasing CH_4 content, and the efficiency of CFC was ppo/o, and optimum power with the marimum decomposition efficiency was 25.3W at 5,000 and 1,000ppm of CFC.

연면방전에 의한 질소산화물의 분해시 전극 공정변수에 대한 영향

안형환,강현춘 대한안전경영과학회 1999 대한안전경영과학회 학술대회논문집 Vol.1999 No.11

본 연구에서는 특수 설계된 연면방전(Surface discharge induced Plasma Chemical Process, SPCP) 반응기로부터 발생하는 플라스마에 의하여 일산화질소(NO)와 이산화질소(NO2)등 유해 환경오염 가스를 주파수, 유량, 농도, 전극재질 및 감은 횟수 등의 공정변수 변화에 따른 분해율, 소비전력 및 소비전압 등을 측정하여 최적의 공정조건과 최대의 분해효율을 얻고자 하였다. 표준시료로서 일산화질소와 이산화질소를 고전압발생기의 주파수(5~50kHz), 유해가스의 체류시간(1~10.5 초)과 초기농도(100~1000 ppm), 전극의 재질(W, Cu, Al), 전극의 굵기(1, 2, 3 mm)및 감은횟수(7회, 9회, 11회)에 대하여 플라스마 연면방전 반응기를 이용하여 분해효율을 구하였다. 유해가스(NO, NO2)의 분해제거 실험결과, 10 kHz의 주파수와 각각 19.8와 20 W의 소비전력에서 각각 94.3, 84.7 %로 가장 높은 분해제거율을 나타내었고, 20 kHz이상에서는 주파수가 커질수록 분해율이 감소하였다. 또한 연면방전 반응기에서 유해가스의 체류시간이 길수록, 그리고 초기농도가 작을수록 분해율은 증가하였다. 방전전극에 대한 영향은 전극의 굵기가 굵을수록 분해율이 증가하여 본 실험의 경우 3 mm의 전극을 사용하였을 때 가장 높은 분해율을 나타내었고, 전극의 재질은 텅스텐을 사용하여 방전한 경우에 가장 높은 분해율을 보였으며 구리, 알루미늄의 순으로 낮아졌다. 방전전극의 감은 횟수에 대한 영향은 7회, 9회, 11회의 순으로 감은 횟수가 많을수록 분해율이 높아짐을 알 수 있었다. For hazardous air pollutants(HAP) such as NO and NO2 decomposition efficiency, power consumption, and applied voltage were investigated by SPCP(surface induced discharge plasma chemical processing) reactor to obtain optimum process variables and maximum decomposition efficiencies. Decomposition efficiency of HAP with various electric frequencies(5~50 kHz), flow rates(100~1,000 mL/min) initial concentrations(100~1,000 ppm), electrode materials(W, Cu, Al), electrode thickness(1, 2, 3 mm) and number of electrode windings(7, 9, 11) were measured. Experimental results showed that for the frequency of 10 kHz, the highest decomposition efficiency of 94.3% for NO and 84.7% for NO2 were observed at the poser consumptions of 19.8 and 29W respectively and that decomposition efficiency decreased with increasing frequency above 20 kHz. Decomposition efficiency was increased with increasing residence times and with decreasing initial concentration of pollutants. Decomposition efficiency was increased with increasing thickness of discharge electrode and the highest decomposition efficiency was obtained for the electrode diameter of 3mm in this experiment. As the electrode material, decomposition efficiency was in order : tungsten(W), copper(Cu), aluminum(Al).

고분자막 이온선택성 전극에 관한 연구

강안수,안형환 明知大學校 産業技術硏究所 1989 産業技術硏究所論文集 Vol.8 No.-

The effect of composition and structure of ion-exchanger, plasticizer, and membrane thickness on the selectivity and the response characteristics of electrode potential was studied. The nitration-selective electrode was prepared using ion-exchanger, plasticizer, and PVC as supporter. As the active material of electrode, the quaternary ammonium nitrate salts like Aliquat 336N, tetracotylammonium nitrate (TOAN), and tetradodecylamnonium nitrate(TDDAN) were used. The Nernst linear response ranges and the detection limits of those electrodes were measured and the effect of interfering anions were anions were discussed. It was concluded that the best characteristics of the Aliquat 336N-PVC membrane electrode were obtained with the ion-exchanger concentration level of 6.5-9.1 percent by weight. The optimal membrane composition was 9.09wt.% of ion-exchanger, 30.95wt.% of PVC, 60.6wt.% of plasticizer (DBP), 0.5㎜ of thickness.

용융압출에 의한 통기성 우의 및 작업복의 개발

安亨煥 충주대 산업과학기술연구소 1997 産業科學論文集 Vol.5 No.-

An porous permeable rain coat and working clothes are prepared by the melt extrution of a porous permeable composition. The porous permeable coposition was constituted the low density polyethylene of 4.0 to 2.owt%, LLDPE of 32 to 50wt%, CaCO3 of 40 to 60wt%, TiO2 of 1.3 to 2.0wt%, CaO of 0.7 to 1.lwt%, Ca-stearate of 0.2 to 0.5wt%, EVA of 1.3 to 2.0wt%, and antioxydant of 0.13 to 0.2wt%. The composition are multifariously kneaded and melt extruded by a know single- or twin-screw extruder. Use of a twin-screw extruder is preferred in view of high extrution rate, extrution stability and mixing intensity. Melt extrusion was usually carried out at a temperature of 160 to 170℃, and a speed of revolution of 90 to 180RPM to form a film or sheet having 40 to 300㎛ in thickness. As a result, The porous permeability was improved with increasing the content of CaCO3. but, the flexibility of the film became worse with increasing of CaCO3. The optimum condition of the composition for the production of rain coat and working clothes in this experiments was LLDPE-37.2wt%, LDPE-4.6wt%, CaCO3-53.8wt%, TiO2-1.5wt%, CaO-0.8wt%, Calsium stearate-0.3wt%, EVA-1.5wt%, and antioxydant-0.l5wt%.

광촉매(Pd/TiO_(2))에 의한 포름알데히드의 분해특성

안형환 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2

In this paper, we propose the photocatalytic decompositon of formaldehyde gas with Pd/TiO_(2) and UV intensity 750㎼/㎤, the photocatalytic reactor was set-up in the inside of rectangular box(volume 2 ℓ), UV lamp and the coating nanofiber with Pd/TiO_(2). We investigated the reaction rate of Langmuir-Heinshelwood, conversion of formaldehyde gas on flow rate, effect of conversion under different concentration, and effect of conversion humidity level. As results, the rate constant of rate(k) and adsorption constant(β) were 114.94ppmv/min,0.0036bppm^(-1), respectively and the conversion(%) of formaldehyde gas on flow rate was decreased to 26%, comparing with the first conversion(%). The effects of conversion on formaldehyde gas concentration decreased to 51% with increased concentration and incase of conversion on humidity level, the conversion decreased with increased of humidity level the reason judged as a cause of interference factor on the decrease of contact chance with photocatalysts.

양이온 선택성 흡착제를 이용한 모의 폐수중 중금속 이온의 제거에 관한 연구

安亨煥 충주대학교 산업과학기술연구소 2002 産業科學論文集 Vol.10 No.-

To study adsorption properties of heavy metal ions in mock waste water, I produced sulfonic acid-type-strong-acid cation exchange resins(Na-type) as making use of styrene and methylmethacrylate for a cross-linker. I was experimental investigation to the changed adsorption weight of Cu^2+,Ni^2+ions on the composition of azobisoisobutyronitrile(AIBN), isooctane, polyvinylalcohol(PVA), and cross linking degree. It was concluded that the effect of the adsorption weight of AIBN was improved with increase of the quantity of AIBN in Cu^2+,Ni^2+ions, and the adsorption weight of Cu^2+,Ni^2+ions on PVA was constant with increase of the quantity of PVA, and the adsorption weight of Ni^2+ion was improved with increase quantity to 45ml of Isooctane but, was decrease at above of 45ml, and optimum crosslinking degree was 8wt%.