• 한국응용과학기술학회지
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• 제33권4호
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• pp.836-847
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• 2016

본 연구는 바이오매스를 열분해하여 생성된 수상오일(water soluble oil)을 얻었다. MDO(Marine Diesel Oil)와 수상오일을 유화시켜 생성된 에멀젼 연료의 특성과 배출가스를 연구 하였다. 바이오매스로는 톱밥을 사용하였고 $500^{\circ}C$에서 열분해하여 생성된 물과 탄화수소를 응축시켜서 수상오일을 얻었다. 수상오일을 MDO에 10~20% 까지 혼합 후 유화시켜 에멀젼 연료를 만들었다. 엔진 배출가스 측정은 엔진 dinamometer로 실시하였다. 유화연료는 연소실내에서 미세폭발을 일으켜 연료를 잘게 쪼개어 주어 smoke를 감소시킨다. 그리고 물이 연소실내의 기화열을 빼앗아 연소실 내부의 온도를 낮추어 NOx 생성을 억제하는 효과를 갖는다. ND-13모드의 각 모드별 배출가스온도가 MDO에 비해 유화연료를 사용했을 때 낮게 나온 것으로 뒷받침 될 수 있었다. 유화연료의 함수율이 증가함에 따라 NOx와 smoke의 배출량은 줄어들었으며, 출력도 함수율 증가에 따라 유화연료 자체의 발열량 감소로 인하여 줄어든 것으로 판단된다. ND-13모드에서 MDO 유화연료를 시험한 결과 바이오매스오일 함유량 20%인 유화연료의 NOx 감소량은 약 25%, smoke의 총감소량은 약 60%, 그리고 약 15%의 출력손실을 확인하였다.

• 한국방재안전학회논문집
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• 제11권2호
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• pp.69-74
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• 2018

환경적인 영향에 대해 민감하게 발생하는 안개는 특정 지역/시간대를 예측하기 어려워 시민의 안전에 대한 위험성을 가진다. 따라서 기존의 소극적이고 수동적인 대응방안이 아닌 건조공기와 음이온 응결핵을 통해 안개입자를 직접적으로 제거할 수 있는 안개제거장치를 이용한 백연성 안개 저감 기술을 제안하고자 한다. 이에 본 연구에서는 저류지 환경에서 자주 발생하는 백연성 안개에 대하여 안개제거장치를 이용한 저감 효과를 확인하고 기온 환경에 따른 영향성을 분석하고자 실험적 검증을 수행하였다. 동일한 환경 조건에서 100 m 거리에 위치한 표지판을 설치하여 가시거리를 비교하였다. 그 결과 30초 이내에 100 m 이상의 가시거리를 확보 가능하였으며 이것으로 안개저감효과가 효과적임을 확인할 수 있었다. 또한 기온 환경에 따라 온도가 낮을수록 백연성 안개가 크게 발생하였으나 기온 환경별 백연성 안개의 저감효과에 대한 영향성은 미미한 것을 확인하였다. 본 실험을 통해 안개제거장치를 이용하여 저류지환경에서 발생된 백연성 안개에 대한 저감 효과를 검증할 수 있었다.

• Journal of information and communication convergence engineering
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• 제2권3호
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• pp.172-176
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• 2004

In special effects industry there is a high demand to convincingly mimic the appearance and behavior of natural phenomena such as smoke, waterfall, rain, and fire. Particle systems are methods adequate for modeling fuzzy objects of natural phenomena. This paper presents particle system graphics library for generating special effects in video games and virtual reality applications. The library is a set of functions that allow c++ programs to simulate the dynamics of particles for special effects in interactive and non-interactive graphics applications, not for scientific simulation.

• 한국자동차공학회논문집
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• 제9권6호
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• pp.8-15
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• 2001

An aftertreatment system of diesel exhaust gas was attempted to extract particulate matters. The system consisted of a corona-less electrostatic precipitator to agglomerate soot particles and a counter-flow cyclone to collect them. When the effect of high voltage was examined at different configuration of electrode plates, the case of positive 15kV at both plates showed the maximum reduction of 38% in diesel smoke level. However, the back pressure became quite high as engine speed increased, so that minimizing pressure drop in cyclone should be studied with improving collection efficiency of soot particles.

• 한국환경보건학회지
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• 제36권3호
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• pp.171-181
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• 2010

Semivolatile aerosols exist as vapor and particles at the same time in room temperature and each phase has different intake and uptake mechanisms. This characteristic requires substantial consideration during exposure assessment of semivolatile aerosol. Some sampling methods for solid particles pose high possibility of evaporative loss during sampling. Therefore, when establishing sampling strategy for them, the factors affecting the phase distribution of semivolatile aerosol should be counted including semivolatile aerosol of interest and sampling methods used. Evaluation for phase distributions of semivolatile aerosols is also recommended. Metalworking fluids, pesticides, asphalt fumes, diesel exhaust, and environmental tobacco smoke are common health-related semivolatile aerosols in workplaces.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 1997년도 International Symposium on Fire Science and Technology
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• pp.178-184
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• 1997

The cone calorimeter as defined by ISO 5660, ASTM 1354, and NFPA 264A is used to assess the reaction to fire of almost any material that must be evaluated in the fire science field. Typical combustion gas analyses include oxygen, CO and CO2. Oxygen consumption is used to determine rate of heat release. Analysis of combustion gases other than oxygen, CO and CO2 has been attempted using filters to remove the solid smoke particles before analysis. This method has generated unreliable results due to the adsorption of many gas components on the active carbon . particles deposited on the filters. A technique using fourier Transform Infrared (FTIB) analysis without filtration will be disclosed and a discussion will be presented of the analytical results of toxic gases produced from various flame retarded polymeric materials. Use of such data in lethal toxic potency determinations is also reviewed.

• 조명전기설비학회논문지
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• 제25권7호
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• pp.83-91
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• 2011

Even if smoke, fumes, mist or dust particles are removed by electrostatic precipitators (ESPs), the occurrence of ozone, which is harmful to human body, has to be severely restricted in the indoor environments of hospitals, offices, and workshops. Therefore, the two-stage ESP generating positive corona at the ionizer is typically used because it creates less ozone than the two-stage ESP generating negative corona at the ionizer. In order to predict the collection performance and the optimal design of the two-stage ESP applied to positive high-voltage, particle concentration is experimentally investigated in this paper. In addition, particle motion within the collector section is also numerically analyzed. The positive corona discharge current of the ionizer is found to be affected by the applied voltage in the collector section but less so by the particle concentration. Particle concentration shows a minimum near the high voltage electrode of the collector section. The minimum value of the collection efficiency is almost proportional to gas velocity. When the collector length decreases, the minimum value of the collection efficiency increases. Charged particles entering the collector region are linearly deflected towards the grounded plate by an electric field. From the above experimental and numerical results, two empirical equations on the concentration ratio and the collection efficiency are derived, and are in good agreement with the experimental data.

• 한국연소학회지
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• 제22권4호
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• pp.1-8
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• 2017

This study was conducted to evaluate the fire retardant performance of exfoliated graphite nanoplatelets (xGnP) applied for particleboard. This work measured heat release rate(HRR), total heat release(THR) and smoke production rate(SPR) of xGnP added particleboard, using cone calorimeter to assess its fire characteristics according to the KS F ISO 5660-1 standard code. Heat release rates of all specimens treated by xGnP were less than the $200kW/m^2$ for a total experiment period of five minutes. Heat release rates of the specimens coated with xGnP were lower than those of the specimens made by mixing wood particles with xGnP directly. Meanwhile, the total heat release rates of xGnP coated specimen maintained quite lower level than the uncoated so the xGnP coating were effective in improving the fire retardant performance of particleboard. However, the smoke emission peaking problem at the initial combustion period, which was caused by adding base coating materials, should be resolved for further satisfaction as a fire retardant materials.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2006년도 추계공동학술대회
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• pp.325-336
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• 2006

This research analyzes clean room major fire prevention standard of clean Room (FM, IRI, and NFPA Code), the structure of Performance-Based Fire Safety Design (PBD) applied the korean fire industry situation. Performance-Based Fire Safety can operate effectively the performance of fire protection equipment & building design, so the fitness of fire safety system can be embodied by operating this. moreover, cost to be consume fire safety of real building can reduce and Performance-Based Fire Safety is considered to important technique in fire protection field. A fire in a clean room may cause a serious loss by spreading smoke particles. We will be investigated by using a computational fluid dynamics, for loss prevention by smoke spreading from one fire area to another for clean room and compared the Performance-Based Fire Safety Design with the prescriptive code design. The methodology of fire safety performance-based fire safety design and guarantee of many kinds design skill of fire system and developing design procedure will be very serious one in order to improve efficiency of domestic system. Therefore, This research will be contributing to secure safety of clean room and to set up the performance-based fire safety design in Korea by regulation for the performance-based fire safety design effectively.

• 대한안전경영과학회지
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• 제8권5호
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• pp.211-229
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• 2006

This research analyzes clean room major fire prevention standard of clean Room(FM, IRI, and NFPA Code), the structure of Performance-Based Fire Safety Design(PBD) applied the korean fire industry situation. Performance-Based Fire Safety can operate effectively the performance of fire protection equipment & building design, so the fitness of fire safety system can be embodied by operating this. moreover, cost to be consume fire safety of real building can reduce and Performance-Based Fire Safety is considered to important technique in fire protection field. A fire in a clean room may cause a serious loss by spreading smoke particles. We will be investigated by using a computational fluid dynamics, for loss prevention by smoke spreading from one fire area to another for clean room and compared the Performance-Based Fire Safety Design with the prescriptive code design. The methodology of fire safety performance-based fire safety design and guarantee of many kinds design skill of fire system and developing design procedure will be very serious one in order to improve efficiency of domestic system. Therefore, This research will be contributing to secure safety of clean room and to set up the performance-based fire safety design in Korea by regulation for the performance-based fire safety design effectively.