• 한국건축시공학회지
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• 제14권2호
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• pp.187-194
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• 2014

With environmental regulations continuously being strengthened internationally the need to control environmental pollution and environmental load is emerging in Korea. The purpose of this study is to seek methods or using waste cementitious powder as an alternative raw material for limestone through the optimization of raw material and to quantitatively analyze the resulting reduction of $CO_2$ emission in order to contribute to solving the issue of waste, which is the biggest issue in relation to construction and global warming. The results of the study, show that waste cementitious powder can be used as an alternative raw material for limestone at OPC level, but it was also found that mixing fine aggregate cementitious powder into waste cementitious powder significantly affected the substitution rate for limestone with waste cementitious powder and the reduction of greenhouse gas. In particular, when fine aggregate cementitious powder was used at a rate of 0~20%, the substitution rate for limestone and the reduction in the rate of greenhouse gas emission was significantly reduced. It is thought that a technique to efficiently separate and discharge the fine aggregate cementitious powder mixed in waste cementitious powder needs to be developed in the future.

• 연구논문집
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• 통권30호
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• pp.33-42
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• 2000

We must stabilize quickly increasing waste matters in urban life and livestock industry. Biogas including landfill gas and digester gas is byproduct of anaerobic decomposition of organic waste matter and contains 40%-70% methane, which can be used for energy purposes. Utilization of biogas reduce the emission of methane into the atmosphere to minimize greenhouse effect and the carbon dioxide (CO2) emitted when biogas is converted to energy has been taken out of the atmosphere by growing plant. Recently, bioenergy is world-widely noticeable as all contributing to the greenhouse effect. This paper presents development process of a biogas engine for cogeneration system and results of application to digester gas and landfill gas in site. The biogas engine is a dual fuel engine operated on biogas with a diesel pilot. At present, the engine can substitute biogas for diesel fuel up to 85%. but it can be said that there is a possibility of improvement in performance.

• 유기물자원화
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• 제8권3호
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• pp.89-96
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• 2000

본 연구는 $CaCO_3$가 주성분인 굴 패각을 이용하여 혐기성퇴비화 반응시 율속단계의 원인인 pH저하를 감소시킴으로써 혐기성퇴비화에의 굴 패각 적용가능성에 대하여 조사하였다. 실험은 혐기성퇴비화 반응조 5기(R-l~R-5)를 제작하여 음식쓰레기와 접종을 위한 숙성퇴비를 넣은 뒤 굴 패각을 음식쓰레기 주입량에 대해 30%, 60%를 주입하여 중온에서 60일동안 실험하였으며, 메탄가스 발생량, 가스성분비, 유기물제거율 및 pH 등을 측정하였다. 실험결과 가스발생량은 R-1 $0.62{\ell}/g-VS$, R-2 $0.63{\ell}/g-VS$, R-3 $0.16{\ell}/g-VS$, R-4 $0.75{\ell}/g-VS$, R-5 $0.21{\ell}/g-VS$로 나타났으며, 메탄가스 발생량은 R-1 $0.32{\ell}/g-VS$, R-2 $0.37{\ell}/g-VS$, R-3 $0.04{\ell}/g-VS$, R-4 $0.42{\ell}/g-VS$, R-5 $0.05{\ell}/g-VS$로 나타났다. 혐기성퇴비화의 효율을 결정짓는 가스성분비는 R-2, R-4에서의 메탄가스발생량이 전체가스발생량의 55%이상으로 경제성이 있는 것으로 나타났다. pH는 굴 패각을 30% 넣어준 R-2, R-4에서 pH 6.0~8.0을 유지하였으며, 굴 패각을 60% 넣어준 R-3, R-5에서는 pH가 8.5이상으로 상승하여 미생물에 악영향을 미침으로써 혐기성 반응이 제대로 이루어지지 못하였다.

• 설비공학논문집
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• 제26권6호
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• pp.287-293
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• 2014

Internal combustion engines release 30~40% of the energy from fossil fuels into the atmosphere in the form of exhaust gases. By utilizing this waste heat, plenty of energy can be conserved in the auto industry. Thermoelectric generation is one way of transforming the energy from engine's exhaust gases into electricity in a vehicle. The thermoelectric generators located on the exhaust pipe have been developed for vehicle applications. Different experiments with thermoelectric generators have been conducted under various test conditions as following examples: hot gas temperature, hot gas mass flow rate, coolant temperature, and coolant mass flow rate. The experimental results have shown that the generated electrical power increases significantly with the temperature difference between the hot and the cold side of the thermoelectric generator and the gas flow rate of the hot-side heat exchanger. In addition, the gas temperature of the hot-side heat exchanger decreases with the length of the thermoelectric generator, especially at a low gas flow rate.

• 자원리싸이클링
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• 제31권6호
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• pp.18-24
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• 2022

건축용 유리생산공정에서 유리의 평활도 제어를 위한 주석욕조에서 발생하는 폐주석 산화물로부터 천연가스를 이용하여 주석을 회수하는 건식환원공정을 제안하고 환원거동을 고찰하였다. 천연가스 건식환원시스템은 20kg급 연속생산 수직형 반응로로 상부취입, 하부토출 방식으로 시스템을 정립하였다. 모든 반응온도 조건에서 투입가스량이 증가할수록 회수율이 높아지는 결과를 얻었으며, 800℃, 4sccm 조건에서 97.2%의 회수율을 보였다. 반응가스분석결과 23%의 수소를 확인하였으며, 16.6%의 메탄가스 수소전환율을 보였다. 천연가스 환원 주석의 환원반응을 고찰함으로써 폐자원 환원/회수기술 정립에 대한 기초자료를 정립하였다.

• 한국환경보건학회지
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• 제34권5호
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• pp.343-350
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• 2008

Quantifying greenhouse gas (GHG) emissions in the waste sector is important to evaluating measures for reduction of GHG emissions. To forecast GHG emissions and identify potential emission reduction for GHG emissions, scenarios applied with environmental policy such as waste reduction and structural change of waste treatment were developed. Scenario I estimated GHG emissions under the business as usual (BAU) baseline. Scenario II estimated GHG emissions with the application of the waste reduction policy while scenario III was based on the policy of structural change of waste treatment. Scenario IV was based on both the policies of waste reduction and structural change of waste treatment. As for the different scenarios, GHG emissions were highest under scenarios III, followed by scenarios IV, I, and II. In particular, GHG emissions increased under scenario III due to the increased GHG emissions from the enhanced waste incineration due to the structural change of waste treatment. This result indicated that the waste reduction is the primary policy for GHG reduction from waste. GHG emission from landfill was higher compared to those from incineration. However, the contribution of GHG emission from incineration increased under scenario III and IV. This indicated that more attention should be paid to the waste treatment for incineration to reduce GHG emissions.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제33회 KOSCO SYMPOSIUM 논문집
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• pp.168-174
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• 2006

A pilot scale (200kg/hr) pyrolysis melting incineration system is designed and constructed in Korea Institute of Industrial Technology. The incineration process is composed of pyrolysis, gas combustion, ash melting, gas stabilization, waste heating boiler, and bag filter. For each unit process, experimental approaches have been conducted to find optimal design and operating conditions. Especially, a pyrolysis is very important process in that it is a way of energy recirculation and minimizing the waste products. This paper presents major results of the most efficient operating conditions in a pilot scale pyrolysis melting incinerator.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2000년도 제21회 KOSCO SYMPOSIUM 논문집
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• pp.132-139
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• 2000

Oxygen enriched incineration can increase the incineration capacity for wastes and dramatically reduce air pollutant emissions such as CO and dioxine by the allowing complete combustion of wastes in incinerator. Furthermore, this technology is proven to have many benefits including an energy-saving, cost-effective, and versatile application for diverse wastes compared with the conventional air incineration technology. The reduced pollutant emissions in flue gas and higher incineration efficiency are also available when the oxygen enriched air is used for the high temperature incineration systems. On the basis of the experimental results the oxygen enrichment system is successfully applied to the rotary kiln incinerator for industrial wastes. The oxygen enriched incineration system could be allowed more compact design of incinerator and flue gas treatment system due to both increasing incineration capacity and reducing flue gas volume. Therefore, oxygen enriched incineration technology is becoming highlighted in the waste incinerator which strongly require more stable efficiency and environmentally friendly and safe operationPut Abstract text here.

• 대한기계학회논문집
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• 제16권6호
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• pp.1171-1178
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• 1992

본 연구에서는 직접접촉식 열교환기를 이용한 실험을 통하여 열교환기 설계에 가장 중요한 열교환기 단위 체적당 총괄 열전달 계수를 시스템의 작동조건에 따라 구 하여 실제 설계자료로 이용하는 데 그 목적이 있다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2005년도 연구개발 발표회 논문집
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• pp.133-138
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• 2005

The worldwide trend of waste treatment technology is rapidly transferring from "incineration system" to "gasification & melting system" which can derive the resources from waste and charge no more environmental burden to nature. And therefore it is necessary to adopt gasification & melting system to prevent the land pollution and to solve the problem of landfill area. Among several thermal waste treatment processes gasification and melting system is the representative process which can transfer waste to resources such as syn-gas, molten slag, metal hydroxide, mixed salt and sulfur through the process of compaction, pyrolysis, gasification and melting.