3차원 수치모델링을 통한 스토커식 도시페기물 소각로의 연소특성 및 운전성능 최적화

전영남,송형운,김미환,채종성 조선대학교 환경공해연구소 2001 環境公害硏究 Vol.17 No.2

3차원 수치모델링을 통한 스토커식 도시폐기물 소각로의 연소특성 및 운전성능 최적화

전영남,송형운,김미환,채종성 조선대학교 환경연구소 2001 環境硏究 Vol.17 No.2

This study has developed the 3-dimensional numerical model, and applied for the investigation of combustion characteristics and optimized operating conditions in MSW incinerator, in Gwangju. The model developed in this study has verified through the correspondence between the predicted and the measured temperature in combustion chamber which is operating as reference condition. By predictive results. The Sangmoo incinerator has a good characteristics of combustion and low emission, even though after burning zone produces incomplete products by which primary air is introduced not enough. Parametric screening studies have been achieved for the suggestion of optimal operating conditions. For the optimum of combustion characteristics, operating conditions should be changed with varying the property of wastes.

저 발열량 페유 소각기 개발에 관한 실험적 연구

전영남,백원석,송형운,유경석,김성천 조선대학교 환경공해연구소 2004 環境公害硏究 Vol.18 No.-

The advanced waste oil incinerator is suggested that has heat recirculation region in the combustor to burn out the waste oil completely in high temperature zone and heat recuperator in the left side of combustion cavity which plays a role of the flame stabilization of main burner flame by heat recovery of exhaust gas to incinerate waste oil contained water. In order to investigate a simultaneously incineration efficiency of the vessel waste oil contained the hazardous waste which occurs from the vessel and the sea outflow waste oil experiments have been carried out using the emulsion fuel mixed the water and bunker fuel oil C and the blend mixed the light oil and the waste surrogate material (acetonitrile:CH_(3)CN). The results of experiments showed that the waste oil incinerator developed in this study was excellent for the incineration efficiency of waste oil at an air ratio of 1.46 and DRE (destruction and removal efficiencies) of CH_(3)CN was 99.9996% ("5 nines"). And optimum operating conditions for the secondary air flow rate of internal mix burner, preheating temperature and injection point of shipboard waste oil contained acetonitrile were suggested.

보일러내의 Nox 저감 3차원 수치모델

전영남,송형운,김정열,유경석 조선대학교 환경공해연구소 2004 環境公害硏究 Vol.18 No.-

This paper presents numerical simulation of the flow and combustion process in a pulverized coal fired utility boiler of 350MWe with 24 swirl burners installed at the boiler front wall. The numerical model is applied to an Eulerian-Eulerian model of coal combusiton and NOx formation, It uses Eulerian, time averaged, conservation equations for all the dependent variables. Especial attention is paid to the accuracy of the representation of the several physical submodels of the coal particle, such as particle drying, volatilization or heterogenous combustion. In this systematic investigation, burning characteristics of pulverized coal were calcuated temperature, NOx, unburned carbon content of char and exhaust gas composition in utility boiler. Parametric screening studies have been achieved for the suggestion of improvement operating conditions for reducing NOx and unburned carbon content.

덤프 소각기에서 CCI₄/C₃H_(8)분해 특성에 관한 연구

전영남,채종성,송형운,김미환 조선대학교 환경공해연구소 2001 環境公害硏究 Vol.17 No.1

A major source of the hazardous waste generated is from chemical industries producing plastics, herbicides, pesticides and chlorinated solvents. All of these processes produce a class of hazardous waste termed the chlorinated hydrocarbons(CHCs), either directly or from undesirable side reactions. Generally, hazardous waste is physical characteristics of difficult destruction at high temperature. We investigated the destruction characteristics of hazardous waste through incineration. A nonequilibrium combustion model was used to describe the effect of the chemical kinetics due to the flame inhibition characteristics of CCU which was used as the surrogate of hazardous waste. In this study, the numerical simulation data for 3-dimensional dump combustor shows a quantitative good agreement with experimental data. Also dump incinerator shows high destruction efficience of CCl_(4). And parametric screening studies was carried out through numerical simulation with changed CCl_(4)/C_(3)H_(8) ratio, waste injection velocity and waste equilibrium ratio.

덤프 소각기에서 CCI_4/C_3H_8 분해 특성에 관한 연구

전영남,채종성,송형운,김미환 조선대학교 환경연구소 2001 環境硏究 Vol.17 No.1

A major source of the hazardous waste generated is from chemical industries producing plastics, herbicides, pesticides and chlorinated solvents. All of these process produce a class of hazardous waste termed the chlorinated hydrocarbons(CHCs), either directly or from undesirable side reactions. Generally, hazardous waste is physical characteristics of difficult destruction at high temperature. We investigated the destruction characteristics of hazardous waste through incineration. A nonequilibrium combustion model was used to describe the effect of the chemical kinetics due to the flame inhibition characteristics of CCl_4 which was used as the surrogate of hazardous waste. In this study, the numerical simulation data for 3-dimensional dump combustor shows a quantitative good agreement with experimental data. Also dump incinerator shows high destruction efficience of CCl_4. And parametric screening studies was carried out through numerical simulation with changed CCl_4/C_3H_8 ratio, waste injection velocity and waste equilibrium ratio.

슬러지 건조로 설계를 위한 3차원 CFD 모델 개발

전영남,송형운,백원석 조선대학교 환경공해연구소 2006 環境公害硏究 Vol.19 No.1

The purpose of this study lies primarily on the development of the sludge dryer for the dehydrated sludge of moisture content with 70~80 wt.%. The sludge dryer was modified from the rotary kiln type dryer. A numerical simulation on the thermal flow performance in the sludge dryer was carried out to investigate the design factor and operating conditions, Parametric screening studies were carried out for variations of the following variables: dryer shape, injection length of combustion air, velocity of combustion air, temperature of combustion air. By predictive results, the sludge dryer has a good drying characteristics so that input sludge increased with retention time by recirculation zone of high temperature combustion gas in the bed of sludge dryer. Parametric screening studies have been conducted to study optimal dryer shape and operating condition.

간경화를 가진 환자의 척추 수술 후 발생한 급성 간부전 : 증례보고 A case report

김형남,최준석,박천희,이철승,김원태 全南大醫大 2001 전남의대학술지 Vol.37 No.4

흡연습관이 운동습관이 혈중 총 콜레스테롤에 미치는 영향

조효숙,남형천,정동혁 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.1

The purpose of this study is to suggest the direction for antismoking campaign, the appropriate training habits and control by investigating the effect of smoking habits and training habits to serum total cholesterol(STC). This investigation applied, to 520 healthy men, out-Patients at K hospital comprehensive health center in Sungbuk-Gu, Seoul with questionnaires, based on interview and self-report related to smoking habits and training habits. In this study the means and standard deviations for all items were calculated based on the data. The data verified through Independent Group t-test and Independent Group one way ANOVA with SPSS for Window Release 7.5. The significant level for verification of hypothesis was 5%. The result of this study are as follows: 1. The difference in level of STC in smoking group and non-smoking group. The smoking group contained higher level of STC by 23.31mg/dl, which was significantly different in statistics(p<.05). 2. The difference in level of STC in training group and non-training group. The training group contained higher level of STC by 27.72mg/dl, which was significantly different in statistics(p<.05). 3. The difference in level of STC in I group(non-smoking with training), II group(non-smoking with non-training), Ⅲgroup(smoking with training), IV group(smoking with non-training). The level of STC was lowest in I group and highest in Ⅳgroup, which was significantly different in statistics(p<.05). 4. The difference in level of STC in smoking with training group and smoking with non-training group by the amount of smoking per day and the duration of smoking. Regardless of the duration of smoking, the smoking with non-training group contained higher level of serum total cholesterol, which was significantly different in statistics(p<.05). In conclusion, training have an effect on the level of smoker's STC and smoking with non-training is a chief risk factor for disease related to STC. Considering the relation between smoking and training, smoking with training approved to be effective in decreasing the level of STC. Even for smokers with regular training or regular training or reducing the amount of smoking with regular training will be effective in preventing disease related to STC.

익수환아의 예후에 영향을 미치는 인자에 관한 연구

김용배,정대봉,조수형,조남수,박영봉,박상기,김춘호,양은석,문경래 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.3

Drowning is the second most common cause of accidental death of children in Korea. But the study of near-drowning is very rare in Korea. The purpose of our study is to determine the factors that may influence survival on the basis of submersion time, consciousness state upon admission to hospital, the kinds of water, laboratory findings and neurological outcomes. The survey was performed by a retrospective cohort study on 28 near-drowning victims of less than 15 years of age who were admitted to the emergency room in the Chosun University Hospital between May 1988 & May 1997. The results were as follows :1)Sex distribution was 22 males and 6 females. 2) Submersion time was <5 minutes in 9 cases, 5-9 minutes in 6 cases, 10-14 minutes in 5cases, 15-19 minutes in 3 cases, ≥20 minutes in 5cases. 3) Comatose patients upon arrival were 6/7 cases in the death group(86%) and 2/21 cases in the improved group(10%). They had unfavorable outcomes(P<0.05). 4) The first PH value was mean 7.02±0.12 in the death group and mean 7.31±0.13 in the improved group. There was a statistically significant difference between the death and the improved group(P<0.05) 5) The patients who gad increased blood glucose concentration were all 7 cases in the death group and 12/22 cases in the improved group(54%). The mean blood glucose concentration was mean 424.7235.6㎎/㎗ in the death group and mean 140.182.7㎎/㎗ in the improved group. There was a statistically significant difference between the death and the improved group(P<0.05). 6) The patients who had pulmonary edema upon arrival were all 7 cases in the death group and 1/21 cases in the improved group(46%). They had unfavorable outcomes(P<0.05). 7) The patients who had been submerged more than 15 minutes were all 7 cases in the death group and 6/21 cases in the improved group(5%). They had unfavorable outcomes(P<0.05). We conclude that pediatric victims of near-drowning can be assigned to high or low likelihoods of unfavorable our outcomes with the use of five variables ; comatose mentation upon arrival decreased initial blood pH, increased initial blood glucose concentration, pulmonary edema, and maximum submersion time estimated longer than fiften minutes. This prediction rule may be useful if it can be validated in another cohort.