• 한국수소및신에너지학회논문집
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• 제21권5호
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• pp.355-363
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• 2010

High purity hydrogen, 97-99 vol.%, with CO at just ppm levels was obtained in a fixed bed of iron oxide employing the steam-iron cycle operation with reduction at 823K and oxidation in a steam-$N_2$ mixture at 773K TGA experiments indicated that temperature of the reduction step as well as its duration are important for preventing carbon build-up in iron and the intrusion of $CO_2$ into the hydrogen product. At a reduction temperature of 823K, oxide reduction by $H_2$ was considerably faster than reduction by CO. If the length of the reduction step exceeds optimal value, low levels of methane gas appeared in the off-gas. Furthermore, with longer durations of the reduction step and CO levels in the reducing gas greater than 10 vol.%, carbidization of the iron and/or carbon deposition in the bed exhibited the increasing pressure drop over the bed, eventually rendering the reactor inoperable. Reduction using a reducing gas containing 10 vol.% CO and a optimal reduction duration gave constant $H_2$ flow rates and off-gas composition over 10 redox reaction cycles.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.1117-1121
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• 2008

Recently energy consumption and $CO_2$ emission issue are important problem on international society. The present study has been conducted economic analysis considering economical value of $CO_2$ reduction effect. We analyze annual energy cost and annual $CO_2$ emission of the cogeneration system and gas boiler system in hotel. The first results shows that annual energy cost of cogeneration system (751,740,126 won) is more profitable than gas boiler system (801,128,408 won) by 6.2% (49,388,281 won). The second results shows that annual $CO_2$ emission of cogeneration system (3,297 ton) is less than gas boiler system (3,536 ton) by 6.8% (239 ton). The Economical value of $CO_2$ reduction effect is 4,773,898 won. The cost effect according to the reduction of $CO_2$ is corresponding to 9.7% of reduction cost for total energy cost. The result of this study means that $CO_2$ reduction effect is essential item in introduction and change of facility for economic analysis.

• 한국해양환경ㆍ에너지학회지
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• 제4권4호
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• pp.42-50
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• 2001

본 논문에서는 수출입컨테이너 화물의 육상운송에서 연안운송으로의 전환을 이용한 CO₂가스 및 배기가스 배출량 삭감이 제안되어진다. 먼저 국내의 CO₂가스 배출량, 배기가스 배출량, 수출입컨테이너화물의 물동량 등에 대하여 간단히 살펴본다. 또한 경인지역과 부산항사이의 수출입컨테이너화물 수송에 대하여 육상운송에서 연안운송으로의 변환에 의한 CO₂가스 및 배기가스 배출량 삭감효과에 대하여 고찰한다. 마지막으로 연안운송의 분담율 변화와 320TEU 소형컨테이너선 이용에 따른 NOx가스 배출량 변화를 고찰한다. 본 연구의 결과 육상운송에서 연안운송으로의 전환이 CO₂가스 및 배기가스 배출량 삭감에 효과적인 것을 확인하였다.

• 한국기후변화학회지
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• 제4권3호
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• pp.211-219
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• 2013

장기에너지 분석모형인 LEAP 모형을 활용하여 S시 가정 부문의 에너지 소비량 및 온실가스 배출 현황과 온실가스 저감대책에 따른 감축잠재량을 분석하였다. 2009년 S시의 에너지 소비량은 가정 상업부문에서 39.1%로 가장 많이 소비하고 있다. 또한, 가구수 증가로 인해 가정 부문의 에너지 및 온실가스 배출량이 증가할 것으로 전망되고 있어, 가정 부문의 온실가스 저감대책 마련이 시급한 상황이다. 이에 본 연구에서는 S시 가정 부문의 에너지 소비량을 파악하고, S시에 적합한 가정 부문 온실가스 저감대책을 수립하였다. 온실가스 감축 잠재량 예측을 위한 시나리오는 기준시나리오, LED 조명 보급, 에너지 대체, 녹색생활 실천, 통합 저감대책 등 총 5개 대책의 효과를 분석하였다. 2020년 기준 저감대책별 온실가스 배출량을 살펴보면, LED 조명 보급은 2020년 온실가스 배출량이 1,181.0천 $tonCO_2eq$로 기준시나리오 대비 약 6.1%의 감축효과가 나타났으며, 에너지 대체는 1,171.6천 $tonCO_2eq$으로 기준시나리오 대비 약 6.8%의 감축효과가 나타났다. 또한, 녹색생활 실천의 2020년 온실가스 배출량은 1,128.7천 $tonCO_2eq$로 기준시나리오 대비 약 10.2%의 온실가스 배출량을 줄일 수 있다는 결과를 도출할 수 있다. LED 조명 보급, 에너지 대체, 녹색생활 실천을 모두 통합한 통합 저감대책은 2020년 966.9천 $tonCO_2eq$로 기준시나리오 대비 약 23.1%의 온실가스 배출량을 줄일 수 있다는 것으로 나타났다.

• 한국환경과학회지
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• 제25권1호
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• pp.23-29
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• 2016

This study has conducted greenhouse gas emission reduction test as using Oyster-shells originated PCC paper filler compare to non-Oyster shells used PCC. This examination was estimated and calculated in accordance with both IPCC (Intergovernmental Panel on Climate Change) and World Business Council for Sustainable Development (WBSCD). The greenhouse gas emission reduction estimation result indicates that, when oyster shells are recycled and used as paper filler, it reduces $27.97tCO_2\;per\;100\;ton$ of oyster shells. It is greenhouse gas emission $44.27tCO_2$ from PCC production changed to carbon emission reduction when replaced with oyster shell. LNG greenhouse gas emission $16.3tCO_2$ in relation to the pre-treatment with oyster shell per 100 ton is also reflected. As a result, it is assumed that roughly $0.2797tCO_2/oyster\;shell{\cdot}ton$.

• KIEAE Journal
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• 제11권2호
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• pp.67-74
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• 2011

Recently environmental regulations like the Kyoto Protocol, adopted in 1997, required the reduction of the greenhouse gas of 5.2% up to 1990's emissions and 13th General Assembly in 2007, held in Bali of India, have agreed to duty reduction even in developing countries in 2013. Korean government needs research on climate change and greenhouse gas management, such as carbon emissions calculation system and the introduction of greenhouse gas reduction program. Using Top-Down approach with method of IPCC, greenhouse gas emissions from energy, transportation, agriculture, land use and forest, and waste was calculated. Total amount from Shiheung-City in 2007 was about 3,299.581 tons of greenhouse gas $CO_2$. By sectors, the total greenhouse gas emissions in the energy sector mostly accounted for 78 percent, 12 percent from transportation, 6 percent of waste, the landuse/forest sector, 4% of the greenhouse gas emissions. Approximately 5,401,618 tons of the greenhouse gas $CO_2$ was total amount from Ansan-City in 2007. The share of energy sector greenhouse gas emissions was the highest portion of 79 % and 14 percent of transportation, 4% from the waste sector, 3 % from landuse/forest sector.

• Journal of Mechanical Science and Technology
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• 제18권12호
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• pp.2303-2309
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• 2004

Flue gas recirculation (FGR) is a method widely adopted to control NOx in combustion system. The recirculated flue gas decreases flame temperature and reaction rate, resulting in the decrease in thermal NO production. Recently, it has been demonstrated that the recirculated flue gas in fuel stream, that is, the fuel induced recirculation (FIR), could enhance a much improved reduction in NOx per unit mass of recirculated gas, as compared to the conventional FGR in air. In the present study, the effect of FGR/FIR methods on NOx reduction in turbulent swirl flames by using N$_2$ and CO$_2$ as diluent gases to simulate flue gases. Results show that CO$_2$ dilution is more effective in NO reduction because of large temperature drop due to the larger specific heat of CO$_2$ compared to N$_2$ and FIR is more effective to reduce NO emission than FGR when the same recirculation ratio of dilution gas is used.

• 상하수도학회지
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• 제24권3호
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• pp.319-332
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• 2010

In general, wastewater treatment systems consume high-energy consumption depending on operation characteristics of the facilities. Therefore, greenhouse gas(GHG) reduction activities that are application of digestion gas, induction of renewable energy etc. are conducted to reduce energy consumption and to increase energy independence ratio. In this study, GHG reduction in wastewater treatment system identified, searched application of Clean Development mechanism(CDM) approved methodology. If the methodologies apply to GHG reduction activities such as application of digestion gas, heat pump system using the wastewater as heat source, hydropower using the methodology determined CDM applicability, otherwise through several assumptions calculated expectable GHG reduction emissions and determined CDM applicability. As a result, the order of calculated GHG reduction emission showed that collected and energy generation of digestion gas is 66,775 $tCO_2$/yr, gas engine cogeneration system is 8,182 $tCO_2$/yr, heat pump system using the wastewater as a heat source is 72,715 $tCO_2$/yr, and hydropower is 561 $tCO_2$/yr. Consequently, the order of calculated Certified Emission Reductions(CERs) benefit showed that heat pump system using the wastewater, as a heat source is 1,381 million won/yr was estimated as the highest, followed by a collected and energy generation of digestion gas is 1,268 million won/yr.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
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• pp.35-36
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• 2018

According to the nation's greenhouse gas emission statistics, greenhouse gas emissions have been stiffly increasing. Accordingly, the importance of CO₂ reduction is more getting focused over the world. This trend makes the construction equipment be considered as a major target of reduction due to the large volume of emission. This study suggests the feasible methodology for estimating CO₂ emission from construction equipment and for being easily applied on the job sites. The methodology is based on the collection from the segmented CO₂ emission information of construction equipment. This study allows site personnels to estimate the total amount of CO₂ and to take appropriate actions for reasching the environmental regulations.

• Journal of Advanced Marine Engineering and Technology
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• 제36권2호
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• pp.294-301
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• 2012

지구온난화의 주원인으로서 $CO_2$가스 사용량 증가에 의한 온실효과가 전 세계적인 문제가 되고 있다. 특히, 조선산업 분야에서는 아크용접 시 보호가스로서 막대한 양의 $CO_2$가스가 사용되고 있기 때문에 $CO_2$가스 사용량을 감소시킬 수 있는 용접장비의 개발에 대한 요구가 커지고 있다. 따라서, 본 연구에서는 $CO_2$ 보호가스 사용량을 감소시킬 수 있는 토치노즐의 최적형상 설계인자를 검토하기 위한 기초연구로서 Tandem 용접기 토치 극간거리에 따른 $CO_2$ 보호가스 분포에 대해서 CFD해석을 수행하였으며, 극간거리와 아크전류 공급량에 따른 용접성에 대해서도 실험적으로 검토하였다. 토치간 거리에 따라서 가장 효과적인 보호가스층이 존재하며, 최적의 극간거리를 정량적으로 결정함에 의해 $CO_2$ 보호가스의 적정한 사용에 의한 $CO_2$ 가스 사용량을 감소시킬 수 있다.