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Molybdenum Trisulfide 의 유동배소에 관하여
박원희,정종인 한국화학공학회 1967 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.5 No.1
The fluidized bed roasting of molybdenum trisulfide cake which is a by product at the chemical processing plant of tungsten ore in Sangdong, Korea has been studied. The molybdenum trisulfide cake with an organic bridging liquid was agglomerated into spherical granules in a rotating drum. The agglomerated granules with 35 to 200 mesh in size were roasted in a fluidized bed using preheated air. Under the constant air temperature condition, the effect of granule size and bed height on the degree of desulfurization were investigated, and it was found that the granules with 150 to 200 mesh and the bed with 9.75 ㎝ height, 1½ times of the bed diameter, gave the best results. Near 1000℉ of bed temperature, the bed became defluidized and sintered. However, at lower bed temperature than 1000℉, could the granules be dead roasted. It was concluded that the proposed agglomeration fluidized-roasting method could be applied to molybdenum trisulfide cake in the large scale.
박원희,이기준,최규원 한국화학공학회 1964 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.2 No.2
The roasting of molybdenum sulfide cake, a by-product at the chemical processing plant of tungsten ore in Sangdong, Korea, and its optimum operational conditions have been studied. Molybdenum sufide cake was pelletized cylindrically to be packed in the bed, and roasted with the air heated by propane directly. The roasting reaction itself was observed to be extremely rapid and exothermic. The effects of the air rate and inlet air temperature were investigated and the optimum operational conditions were determined. The packed bed height and pellet size also affect the reaction rate remarkably. As the parameter of overall reaction rate, the overall heat liberated rate was calculated from the experimental data and compared with overall weight decrease rate obtained graphically from the thermal balance roasting data. It was found that the molybdenum sulfide cake can be processed economically by the proposed roasting method at the evaluated optimum air rate and inlet air temperature to produce the product containing more than 90% MoO₃ and less than 2% S, which is considered to be rather adequate for the next process of purifying by the method of sublimation.
박원희,조영민,권태순 사단법인 인문사회과학기술융합학회 2017 예술인문사회융합멀티미디어논문지 Vol.7 No.4
A fire phenomenon of a solid such as wood involves a phenomenon in which solid is heated from the outside and the gas generated through the thermal pyrolysis process of the material is burnt. The thermal pyrolysis phenomenon of the solid is a phenomenon in which the amount of energy incident from the outside, the amount of heat dissipation of the solid material, the heat transfer between the solid material and the surroundings including the amount of heat transfer to the air adjacent to the solid surface, and the fraction of oxygen in the air. In this paper, we calculate the required ignition temperature to simulate the fire phenomenon as simple as possible. By using cone calorimeter, the ignition time was measured by variously controlling the heat flux flowing into the wood specimen by using various wood specimens. The user friendly program is developed for calculation of the ignition temperature. Five different woods such as low density MDF, high density MDF, plywood, douglas fir and PB with various thickness are considered. The ignition temperatures suggested in this paper can be used for fire propagation analysis for woods. 목재와 같은 고체에서 불이 붙는 화재현상은 고체가 외부로부터 열을 받아 재료가 열분해 과정을 통하여 생성된 가스가 연소되는 현상을 포함한다. 이러한 고체의 열분해 현상은 외부로부터 유입되는 에너지의 양, 고체재료의 열이 확산되는 정도, 고체표면과 인접하여 있는 공기와의 열전달 정도를 포함한 고체재료와 주변과의 열전달 및 고체의 표면방사율 및 주변의 공기 중 산소의 분율 등 매우 여러 인자와 복잡하게 연결되어 있다. 본 논문에서는 화재현상을 가장 간단히 모사하기 위하여 필요한 발화온도를 산출하였다. 콘칼로리미타를 이용하여 다양한 목재시편을 이용하여 목재시편에 유입되는 열유속을 다양하게 제어하여 발화시간을 측정하였으며 이를 이용하여 발화온도를 산출하였다. 이를 위하여 사용자가 쉽게 사용할 수 있는 발화온도 산출 프로그램을 개발하였다. 고려된 목재는 5종류로 저밀도 MDF, 고밀도 MDF, 합판, 방부목, PB 등이며 다양한 두께에 대하여 고려하였다. 본 논문에서 제시된 발화온도는 고체의 화재 전파현상을 해석하는데 활용될 수 있다.
박원희,박성준,김효진,김한샘,오세찬 한국재난정보학회 2021 한국재난정보학회 논문집 Vol.17 No.4
연구목적: 본 연구는 철도차량 내 승객 이상행동 및 위험상황 중 중요한 위험요소를 도출하기 위하여 승 객 및 운용기관 종사자의 의견을 조사하고 분석을 하였다. 연구방법: 일반국민 20~60대 성인남녀 1,000 명 및 전국 11개 기관의 종사자 429명에게 설문조사를 수행하였다. 일반국민에게는 지하철, 일반철도, 고속철도 등으로 구분하여 철도차량 내 발생 가능한 위험 상황에 대한 설문을 조사하였으며 운영기관 종사자들에게는 지하철 내의 위험 상황에 대한 설문을 조사하였다. 연구결과: 승객위험요소 발생에 대 한 빈도 및 중요도를 판단근거로 선정된 철도차량내 승객 위험요소(이상행동 및 위험 상황) 중 주요 위 험요소로 ‘차량 문끼임’, ‘성추행’, ‘주취행동’, ‘싸움/폭행’, ‘배회’. ‘마스크 미착용’으로 선정하였다. 결 론: 승객에게 영향을 미치는 주요 위험요소는 일반 국민 및 철도운영기관의 종사자들의 설문조사를 통 하여 선정되었다. 본 연구에서 얻은 결과인 철도차량내 주요 위험요소 발생시 신속하며 지속적으로 감 지할 수 있는 AI 기술이 적용된 CCTV 감지 시스템이 개발될 예정이다. Purpose: This study was conducted for the purpose of selecting important events from among various events that may pose a risk to railway passengers. For this purpose, opinions of various railroad vehicle passengers and railway operator workers were investigated and analyzed. Method: The survey was conducted on 1,000 men and women in their 20s and 60s and 429 workers at 11 company across the country. A survey was conducted on the dangerous situations that may occur in subways, general railroads and high-speed rail vehicles targeting passengers. For railway operator workers, the questionnaire is limited to subway vehicles. Result: Among the passenger risk factors(abnormal behavior and dangerous situations) selected based on the frequency and importance of occurrence of passenger risk factors, the main risk factors are selected 'car door jamming', 'sexual harassment', 'intoxicating behavior', 'fighting' /assault', 'wandering around', and 'not wearing a mask'. Conclusion: The major risk factors affecting passengers were selected by surveying passengers and railway operators. we plan to develop a CCTV detection system with AI technology that can quickly and continuously detect the major risk factors of railway vehicles selected as a result of this study.