• 제목/요약/키워드: $CO_2$ emitted

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The relativity of the emitted light of discharge plasma and C02 laser output (방전 플라즈마 빛의 검출량과 CO2레이저 출력의 상관관계)

  • Kim, Tae-Kyun;Lee, Im-Geun;Choi, Jin-Young;Kim, Hee-Je
    • Proceedings of the KIEE Conference
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    • 대한전기학회 2004년도 하계학술대회 논문집 C
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    • pp.1954-1956
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    • 2004
  • Nowadays, $CO_2$ lasers are used widely in many applications such as materials fabrication, communications, remote sensing and military purpose etc. Especially, $CO_2$ lasers are in the spotlight at surface handling and heat processing. It is important to control the laser output power and beam Quality in those fields. And those are studied the important parameters deciding the fluctuation of laser beam are smoothing capacitor, frequency and the characteristics of laser resonator. But the study of plasma parameters of $CO_2$ lasers are little. So we detect the $CO_2$ laser from emitted $CO_2$ laser discharge plasma using a non-contact photo tansistor sensor and Low pass filter. In this study, The relativity of the emitted light of discharge plasma and CO2 laser output.

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Research on Innovation Technologies for Zero Carbon: Carbon Dioxide Reduction in Construction and Concrete Industries (탄소 제로화를 위한 혁신 기술 연구: 건설 및 콘크리트 산업에서의 이산화탄소 저감 방안 동향)

  • Kim, Joo-Hyun;Park, Jung-Jun;Kim, Jong-Kyu
    • Journal of the Korean Society of Industry Convergence
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    • 제25권4_2호
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    • pp.549-563
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    • 2022
  • Continuous global warming is causing ecosystem destruction and direct damage to human life. The main cause of global warming is greenhouse gases, which account for more than 90 % of carbon dioxide. The leaders of each country signed the Paris Agreement at the United Nations Convention on Climate Change (UNFCCC) to reduce greenhouse gas emissions. Currently, the total amount of CO2 emitted from South Korea is 664.7 million tons as of 2018, ranking eighth in the world. 37 % of South Korea's total CO2 emissions come from the construction & building field, especially the cement production, which is a construction material. Carbon reduction technologies can be largely divided into four types: carbon reduction (CC), carbon reduction and storage technology (CCS), carbon reduction and utilization technology (CCU), and carbon reduction, storage and utilization technology (CCUS). Overseas, CCUS technology is mainly applied to reduce and store CO2 emitted from construction and construction field. A technology for permanently storing CO2 through mineralization by capturing CO2 and utilizing CO2 into a cement production process was developed, and this technology is applied to the entire cement industry. However, the development of CCUS technology applicable to the cement industry is still insignificant in South Korea. In this study, carbon dioxide reduction technology and methods for reducing carbon dioxide emitted during the cement manufacturing process, which is the main component of concrete mainly used in civil engineering construction, were investigated. Overseas, it has reached the commercialization stage beyond the demonstration stage as a way to reduce carbon dioxide by vomiting carbonation reactions. Accordingly, if carbon dioxide reduction plan technology generated during cement manufacturing is developed based on domestic technology differentiated from foreign technology, it is expected to contribute one more step to the carbon neutrality policy.

Emission Characteristics of Air Pollutants produced from Idling of Vehicles (차량 공회전시 배출되는 대기오염물질의 배출 특성)

  • 이병규;조성웅;나덕재;정혁용;정광륜;이채복
    • Journal of Environmental Science International
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    • 제8권1호
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    • pp.27-32
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    • 1999
  • This study identified concentrations of all pollutants emitted from idling of vehicles such as cars, taxis, trucks, and buses. In this investigation we analyzed concentrations of $SO_2$, NOx, CO, and $CO_2$ omitted from exhaust pipe of vehicles as a function of vehicle type, mileage, exhaust volume, and fuel type using the GreenLine. Compact or light cars, which have relatively low exhaust volume, showed much higher exhaust concentrations of $CO_2$, CO, and NOx than those emitted from vehicles with high exhaust volume. Vehicles using light oil showed much higher exhaust NOx concentrations than those of vehicles using gasoline. Vehicles using LPG and compact cars showed very high exhaust CO concentration compared to other vehicles. NOx exhaust concentrations were increased with increasing the mileage of vehicles.

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Life Cycle Assessment for Hydrogen Production Method using Stream Reforming of Naphtha (Naphtha의 stream reforming에 의한 수소제조방법에 대한 전과정평가)

  • Park, Hee-Il;Kim, Ik;Lee, Byung-Kwon;Hur, Tak
    • Transactions of the Korean hydrogen and new energy society
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    • 제13권1호
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    • pp.3-12
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    • 2002
  • In this study, it achieved life cycle assessment to estimate environmental performance for naphtha steam reforming that account for the production over 50% of total hydrogen output. Although hydrogen dosen't emit air emissions, especially, $CO_2$, a large of $CO_2$ is emitted in hydrogen production process. In the result of this study, it ascertained the truth that $CO_2$ is emitted at the rate of $6.3kg/kgH_2$ and that result from steam reforming reaction and use of fossil fuel in hydrogen manufacturing process. Above all, 57% of total $CO_2$ emissions is emitted in process of steam reforming of naphtha and so it knew that the principle of steam reforming is key issue in aspect to environment. Also, it compared hydrogen by fuel of fuel cell vehicle with gasoline fuel of general gasoline vehicle to analyze relative environment of hydrogen for fossil fuel during the life cycle. As the result, it might be difficult in improvement of environment because $CO_2$ emissions during the hydrogen manufacturing process is nearly the same with that during the use of gasoline.

Emission Patterns of Carbon Dioxide & Methane by Liquid Pig Manure Treatments in Paddy Soil (논토양에서 돈분액비 시용에 따른 CH4 및 CO2 발생양상)

  • Oh, Seung-Ka;Yoon, Dong-Kyung;Lee, Eun-Jung;Lee, Byung-Jin;Jeon, Seung-Ho;Cho, Young-Son
    • Korean Journal of Organic Agriculture
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    • 제23권4호
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    • pp.923-938
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    • 2015
  • This study was conducted to serve as the basis for establishing a standard cultivation, which enhances the alternative utilization of pig manure, a major cause of environmental pollution, by finding a means for reducing greenhouse gas emissions for eco-friendly cultivation. In a laboratory, $CH_4$ and $CO_2$ emission patterns were investigated corresponding to incremental pig manure treatments in paddy soil. The emissions peaked 12 to 27 days after manure application in the 100~400% applications. It was found that increasing applications of pig manure resulted an increase in $CH_4$ and $CO_2$ emissions. Additionally, application of more than 150% emitted a larger amount of these gasses than applying chemical fertilizer. However, the test application of 100% pig manure emitted a smaller amount of $CH_4$ and hence Global Warming Potential (GWP) than those emitted by chemical fertilizer. If appropriate amount of fertilization is applied in compliance with the standard application rate, the pig manure may be effective in reducing greenhouse gas emissions and the soil environment made more favorable than with the use of chemical fertilizer.

Seasonal and Spatial Variations of CO2 Fluxes Between Surface and Atmosphere in Foreshore, Paddy Field and Woods Sites (갯벌, 논 및 산림 부지에서 지표와 대기 사이의 이산화탄소 플럭스 계절/공간 변동 분석)

  • Kang, Dong-Hwan;Kwon, Byung-Hyuk;Yu, Hun-Sun;Kim, Park-Sa;Kim, Kwang-Ho
    • Journal of Environmental Science International
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    • 제20권8호
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    • pp.963-975
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    • 2011
  • For this research, they were monitored $CO_2$ flux and environmental factors ($CO_2$ concentration, soil temperature, soil moisture, soil organic carbon, soil pH, soil Eh) in foreshore, paddy field and woods sites at the winter season (January 2009) and the summer season (September 2009). Seasonal and spatial variations for monitored data were analyzed, and linear regression functions of $CO_2$ flux as environmental factors were estimated. $CO_2$ fluxes averaged between surface and atmosphere monitored in foreshore and paddy field at the winter season were shown $-8\;mgCO_2m^{-2}hr^{-1}$ and $-25\;mgCO_2m^{-2}hr^{-1}$, respectively. $CO_2$ fluxes averaged between surface and atmosphere monitored in foreshore and paddy field at the summer season were shown $47\;mgCO_2m^{-2}hr^{-1}$ and $117\;mgCO_2m^{-2}hr^{-1}$, respectively. Thus, $CO_2$ was sunk from atmosphere to surface at the winter season and it was emitted from surface to atmosphere at the summer season. $CO_2$ fluxes in woods site were emitted $145\;mgCO_2m^{-2}hr^{-1}$ at the winter season and $279\;mgCO_2m^{-2}hr^{-1}$ at the summer season.

Study of the Density of Smoke and Harmful Gases of Adhesive Indirect Moxibustion (접착식 간접구의 연기 밀도 및 유해가스 발생 확인 연구)

  • Kim, Eun-Jung;Kim, Yu-Jong;Hwang, Ji-Hoo;Cho, Hyun-Seok;Kim, Kyung-Ho;Lee, Seung-Deok;Kim, Kap-Sung
    • The Journal of Korean Medicine
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    • 제33권1호
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    • pp.42-51
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    • 2012
  • Objectives: We measured the density of smoke and harmful gases emitted from burning adhesive indirect moxa. Through the test we aimed to find out if there was an excessive amount of smoke emitted and if it included harmful gases. Methods: 9 types of adhesive indirect moxa were chosen. The buffer layers which do not burn during treatment were removed and 10g of each moxa were made into powder and put into a holder. A smoke density chamber (Smoke Density Chamber FTT. U.K) and Fourier transform infrared spectroscopy (FT-IR I 4001. MIDAC U.S.A.) were used to measure the density of smoke and harmful gases emitted from burning moxa by ISO 5659-2 test. Results: The result of measuring maximum smoke density showed that the regular indirect adhesive moxa (A-F) emitted high density smoke of 172.1-291.4Ds. The smokeless moxas, Seoam moxas, emitted the least amount of 3.4-5.5Ds. Concentrations of 7 typical harmful gases (CO, HCl, HCN, HBr, HF, SO2, NOx) were measured and all of the moxas emitted CO due to incomplete combustion. 4 types of moxa emitted NOx and all smokless moxas emitted NOx. HBr, HCN, HCl, HF, SO2 were not found in any of the moxas. Conclusions: The amount of harmful gases emitted from burning moxa was much lower than short-term exposure standards of chemical and physical factors (Ministry of Labor 2010-44). Further experiments measuring gases from moxa combustion should be done in larger environments similar to normal medical clinics.

$LCCO_2$ Comparison of Existing Apartment Housing and Environment-Friendly Apartment Housing (기존 설계기준 아파트와 친환경 저에너지 아파트의 $LCCO_2$ 비교)

  • Kim, Yu-Min;Sohn, Jang-Yeul
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • 제22권4호
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    • pp.234-240
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    • 2010
  • In October 2009, the Ministry of Land Transport and Maritime Affairs noticed 'Environment-friendly housing construction standards and performance' to build energy saving environment-friendly housings (Green Homes) for the reduction of energy consumption and carbon dioxide emission. In this study, the $CO_2$ emissions were evaluated during the life cycle of the existing apartments which were built in 1980's and Green Home apartment. $LCCO_2$ was evaluated by dividing the life cycle into three stages which are construction, maintenance and destruction stage. $CO_2$ emission from the materials for improving insulation performance was estimated by Input-output analysis. As a result, in 40 year-life cycle of $84\;m^2$ apartment, 400.68 T-$CO_2$ was emitted from 1980's apartment, on the other hand 231.02 T-$CO_2$ was emitted from Green Home apartment.

The Study on the Emission Characteristics of HAPs and PM from the Motor Vehicle Paint Facility (자동차 도장시설에서 발생하는 유해대기오염물질 및 미세먼지의 배출특성에 관한 연구)

  • Kim, Han-Na;Bong, Choon-Keun;Kim, Yong-Gu;Jeon, Jun-Min
    • Journal of Korean Society for Atmospheric Environment
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    • 제29권6호
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    • pp.713-721
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    • 2013
  • This study is about emission characteristics of HAPs and particulate matters emitted by spray of paint and organic solvent usually used in vehicle paint facilities. To analyze emission characteristics of HAPs and particulate matters emitted from vehicle paint facilities are calculated based on the measuring emission quantity of pollutants based on the amount of paint used (kg) and unit area ($m^2$) by paint manufacturers (J company, K company, and R company). In cases of paint manufacturers (J, K, and R), average emission factors of VOCs, carbonyl compound, particulate matter, and PAHs per 1 kg of paint were 327.81 g/kg, 5.98 g/kg, 336.70 g/kg, and 0.0078 g/kg respectively. The average emission factors of VOCs, carbonyl compounds, particulate matters, and PAHs by unit area were $171.55g/m^2$, $3.10g/m^2$, $176.27g/m^2$, and $0.0036g/m^2$ respectively.

Calculation of CO2 Emission for Fossil-Fired Thermal Power Plant considering Coal-Oil Mix Rate (혼소율을 고려한 화력 발전소의 CO2 대기배출량 계산)

  • Lee, Sang-Joong;Kim, Soon-Ki
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • 제24권10호
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    • pp.67-72
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    • 2010
  • G8 summit meeting held in July 2008 decided to set up a long-term goal, by 2050, reducing the world greenhouse emissions by half of those emitted in 1990. In November 2009, the Government announced to reduce the national $CO_2$ emission by 30[%] of BAU by 2020. Electric power industries in Korea produce most of their electricity by burning fossil fuels, and emit approximately 28[%] of national $CO_2$ emissions. Monitoring the $CO_2$ emissions. Monitoring the $CO_2$ emission of electric power plants is very important. This paper presents a method to calculate the hourly $CO_2$ emission for a thermal power plant burning mixture of coal and oil using the performance test data and coal-oil mix rate. An example of $CO_2$ emission calculation is also demonstrated.