• 방재와보험
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• s.51
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• pp.58-60
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• 1991

특수재료 가스의 화재와 일반 가스의 화재 성상을 비교할 때 전자는 자연발화성 가스 또는 독성 가스가 많은 것이 특징이다. 이러한 가스의 화재를 예방하기 위해서는 우선 누설 및 화재의 방지대택을 연구 검토하여야 하며 특히 수송이나 저장시 각별한 주의를 기울이지 않으면 안된다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1543-1543
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• 2015

반도체식 가스센서의 한계를 극복하기 위하여 열불소화 방법과 활성화 방법을 이용하여 NO 가스 감지용 가스센서를 제조하였으며, 각각의 특성을 평가하였다. 열불소화 처리된 탄소나노튜브는 열처리 온도에 따라 반도체적 성질이 p-type에서 n-type으로 변화한 후 다시 p-type으로 변화하였으며, 활성화 처리된 탄소나노튜브는 비표면적이 증가할수록 NO 감지에 따른 저항변화가 증가하였다. 저항변화율은 $200^{\circ}C$에서 불소화 처리된 탄소나노튜브가 가장 크게 나탔으나 응답시간을 고려할 경우 $600^{\circ}C$에서 불소화 및 6M의 KOH를 이용한 경우 가장 우수한 특성을 보였다.

• Journal of the Korean Institute of Gas
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• v.24 no.2
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• pp.36-43
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• 2020

Gas system fire extinguishing equipment is a very economically useful facility, but if it is not used for a long period of time after installing the equipment, there is possibility of rupture due to corrosion of containers and operation errors of equipment systems, and this is very dangerous. However, it is impossible to experiment to check whether the equipment is operating normally. If gas is temporarily released into the enclosed space due to rupture and malfunction, it can cause serious human damage due to gas suffocation. In this study, based on the suffocation death accident of gas system fire extinguishing facility, the inflow path of released gas and the possibility of death and time to death were estimated using a 3D scan and FLACS.

• 한국가스학회:학술대회논문집
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• 2003.10a
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• pp.9-13
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• 2003

• Journal of environmental and Sanitary engineering
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• v.15 no.2
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• pp.75-84
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• 2000

운전 온도 $35^{\circ}C$, 평균 유기물부하 $3.1{\;}kgCOD/m^3/day$ 및 수리학적체류시간 10일에서 혐기성 연속회분식공정에 의한 분뇨처리를 수행하였다. 공정의 평가는 대조 소화조로 완전혼합형의 소화조와 병행하여 수행되었다. 본 실험에서 분뇨는 고농도의 암모니아성 질소와 침전성 고형물을 함유하고 있음에도 불구하고 희석 없이 소화가 가능하였다. 혐기성 연속회분식공정에서 고형물은 급속하게 증가하여 완전혼합형의 대조 소화조에 비하여 소화조내 고형물(biomass)의 농도가 2.4배로 증가하였고, 가스발생량에 있어서도 대조 소화조에 비해 현격한 증가를 보였으며 그 증가율은 205~220%에 달했다. 부가적인 침전 시설이 없이도 혐기성 연속회분식공정의 유출수질이 대조 소화조 보다 높게 나타났는데 상징액 기준으로 휘발성고형물 제거율은 혐기성 연속회분식공정이 대조 소화조 보다 12~14% 높았다. 한편, 혐기성 연속회분식공정의 운전인자로 반응/침강비(R/T ratio)를 조사한 결과 R/T비가 1인 경우가 3의 경우보다 가스발생량, 메탄함량 및 유기물 제거율이 약간 높았으나 큰 차이는 없었다. 위의 실험결과들로부터 혐기성 연속회분식공정은 고농도의 암모니아성 질소와 침전성 유기물을 함유하고 있는 분뇨의 처리에 효과적이고 안정적인 공정으로 판단된다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.341-344
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• 2010

발화점 감지 튜브 자동소화장치는 화재발생시 일정한 온도가 되면 튜브가 녹아 가스가 방출되면서 소화용기내의 소화약제가 방출되어 화재를 진압하는 장치로써 전력의 공급 없이도 화재의 감지 및 소화가 가능한 자동소화장치이다. 본 논문에서는 감지온도 $100^{\circ}C{\sim}110^{\circ}C$에서 열에 반응하여 가스방출이 가능한 첨단 폴리머 튜크 재질의 발화점감지 튜브를 개발하고자 기존 발화점 감지 튜브의 특성을 분석하였다.

• Fire Science and Engineering
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• v.18 no.2
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• pp.12-19
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• 2004

The commercially available IG-541 extinguished agent composed of inert gases was developed for environmental protection. The extinguished agents were considered in terms of physical properties, efficient characteristic, environment, stability, and economical efficiency. The pure and mixture components of physical properties of $N_2$, Ar and $CO_2$ were chosen and compared. The physical properties of density, viscosity and surface tension of inert gases were plotted with the molar ratios of $N_2$/$CO_2$ and Ar/$CO_2$ in terms of a temperature. The extinguished agent in the composition of $N_2$, Ar and $CO_2$, 50/40/10 (mol %) showed relatively high density, low viscosity and moderate surface tension, therefore it was suitable for the alternative extinguished agents.

• Journal of the Korea Organic Resources Recycling Association
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• v.11 no.3
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• pp.75-86
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• 2003

In the near future, the capacity of conventional anaerobic digester is thought to be insufficient because of the increase of the total solids from expansion of intercepting sewer, sewage quantity and direct input of night soil from near apartment districts. The objectives of this study was to investigate the improvement of digestion efficiency using microbial agent(Bio-dh). The system was a pilot-scale, two-staged, anaerobic sludge digestion system. The first-stage digester was heated and mixed. The agitation velocity of the first-stage digester was 120rpm. The second-stage digester was neither heated nor mixed. The Digestion temperature was kept at $35{\pm}1^{\circ}C$ The detention time of digester was 19 days. The dosage of sewage sludge and microbial agent were $0.65m^3/day$ and $0.5{\ell}/day$, respectively. The experiments was run for 25days. Three times a week, $COD_{Mn}$ and SS of effluent, TS, VS, and biogas production rate were measured. Temperature, pH, and alkalinity were measured daily. The results were as follows ; Without microbial agent, digestion efficiencies ranged 46.0%~50.9%(mean=48.6%), with microbial agent(Bio-dh), digestion efficiencies ranged 52.8%~57.3%(mean=54.2%). Consequently, microbial agent(Bio-dh) increased the sludge digestion efficiency about 12%. Also, Without microbial agent, the mean concentration of $COD_{Mn}$ and SS of second-stage digester effluent were 1,639mg/L, 4,888mg/L respectively. With microbial agent, the mean concentration of $COD_{Mn}$ and SS of second-stage digester effluent were 859mg/L, 2,405mg/L respectively. Consequently, microbial agent(Bio-dh) increased the removal efficiency of $COD_{Mn}$ and SS about 47.6% and 50.8%, respectively.

• Journal of Korean Society of Environmental Engineers
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• v.35 no.9
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• pp.660-665
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• 2013

To find out the major cause of scale formation in digestion facility, a componential analysis of scale and a digestion experiment for food wastewater were conducted. The analysis indicated that grease in food wastewater was closely connected to the organic component of scale. It is also indicated that grease-removed food wastewater showed 58.9% level compared to unprocessed one in crystal generation quantity in this study. The experiment provided insight that grease is one of the important causes of scale formation. Additionally, pre-removal of grease from food wastewater did not show negative effect on digestion gas production, as 68.7 L-gas/kg-COD for grease-removed food wastewater and 67.7 L-gas/kg-COD for unprocessed one.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2002.05a
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• pp.249-260
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• 2002