• Title/Summary/Keyword: anthracite

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Evaluation of Decreasing Concentration of Radon Gas for Indoor Air Quality with Magnesium Oxide Board using Anthracite (안트라사이트를 활용한 산화마그네슘 보드의 실내 공기질 중 라돈가스 농도 저감 평가)

  • Pyeon, Su-Jeong;Lim, Hyun-Ung;Lee, Sang-Soo
    • Journal of the Korea Institute of Building Construction
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    • v.18 no.1
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    • pp.9-15
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    • 2018
  • Radon gas, which is present on the earth, is a primary carcinogen released from rocks, soil, building materials, etc., and exists as a unique gas phase. In order to solve the risk of radon gas, we evaluated the basic performance which can be used as indoor finishing materials in addition to the radon gas reduction properties of the matrix using anthracite. An anthracite used as a conventional filter material was used to produce a matrix, and a test was conducted to replace the gypsum board, which is one of the building materials used in the existing room. As the anthracite replacement ratio increases, flexural failure load strength increases and thermal conductivity tends to decrease. Depending on the thickness of the board, the reduction performance of radon gas shows a slight difference.

Circulating Fluidized Bed Combustion of Korean Anthracite and Fabricated Anthracite Fines (국내 무연탄과 미분을 성형한 무연탄의 순환유동층 연소)

  • Shun, Do-Won;Bae, Dal-Hee;Oh, Chang-Sup;Kim, Heon-Chang
    • Applied Chemistry for Engineering
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    • v.21 no.5
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    • pp.553-558
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    • 2010
  • To solve the problems of the low combustion activity of Korean anthracite and the abundant loss of unburned carbon in fly ash, pellet coal was fabricated from coal fines and fly ash, and the mixed combustion of coarse coal with the pellet coal was examined in the circulating fluidized bed combustor of a 0.1 MW scale test unit. In the combustion of the raw coal only, the significant amount of coal fines was entrained, resulting in overheat at the top of the combustor. With the coarse coal that most fines were eliminated, however, the combustion temperature was maintained stable. The mixed combustion of coarse and raw coals was also feasible even though it often went unstable. The mixed combustion of the coarse coal with the pellet coal was as stable as the coarse coal combustion, showing a promise that the combustion of the Korean anthracite in commercial circulating fluidized bed boilers could be further enhanced.

Development of Greenhouse Gas (CH4 and N2O) Emission Factors for Anthracite Fired Power Plants in Korea (국내 무연탄 화력발전소의 온실가스 배출계수 개발 - CH4, N2O를 중심으로 -)

  • Lee, See-Hyung;Kim, Jin-Su;Lee, Seong-Ho;Sa, Jae-Hwan;Kim, Ki-Hyun;Jeon, Eui-Chan
    • Journal of Korean Society for Atmospheric Environment
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    • v.25 no.6
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    • pp.562-570
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    • 2009
  • Although anthracite power plant acts as the important source of greenhouse gas emissions, relatively little is known about its emission potentials. Especially, because the emissions of Non-$CO_2$ greenhouse gas $CH_4$ and $N_2O$ are strongly dependent on fuel type and technology available, it is desirable to obtain the information concerning their emission pattens. In this study, the anthracite power plants in Korea were investigated and the emission gases were analyzed using GC/FID and GC/ECD to develop Non-$CO_2$ emission factors. The anthracite samples were also analyzed to quantity the amount of carbon and hydrogen using an element analyzer, while calorie was measured by an automatic calorie analyzer. The emission factor of $CH_4$ and $N_2O$ computed through the gas analysis corresponded to 0.73 and 1.98 kg/TJ, respectively. Compared with IPCC values, the $CH_4$ emission factor in this study was about 25% lower, while that of $N_2O$ was higher by about 40%. More research is needed to extend our database for emission factors of various energy-consuming facilities in order to stand on a higher position.

Economic Feasibility of Conversion of the Pulverized Coal Firing Boiler using Korean Anthracite into a Circulating Fluidized Bed Boiler (국내탄용 미분탄 보일러의 순환유동층 전환에 따른 경제성 평가)

  • Lee, Jong-Min;Kim, Dong-Won;Kim, Jae-Sung;Kim, Jong-Jin;Kim, Hyeng-Seok
    • Korean Chemical Engineering Research
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    • v.44 no.5
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    • pp.489-497
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    • 2006
  • The economical efficiency of conversion of the PC (pulverized coal) firing boiler to the CFB (circulating fluidized bed) boiler which used Koran anthracite as fuel was evaluated. The economic feasibility study was also carried out with regard to maintenance of the existing PC boiler. The sensitivity of economical efficiency with variation of the electric power and coal industry and the policy of government was analyzed and compared. As a results of the evaluation, the economical efficiency of maintenance of the existing PC boiler was higher than that of conversion to the CFB boiler because of the special policy of the government for Korean anthracite. However, the conversion to the CFB boiler was more economically attractive from a point of view of effective use of energy resources and future electric power industry. Additionally, the fund support for electric power industry using Korean anthracite would be effective as changing the policy of the government.

A Quantitative Evaluation of Combustion Characteristics of Coke/Anthracite in an Iron Ore Sintering Bed (소결층 내 코크스/무연탄 연소 특성의 정량적 평가)

  • Yang, Won;Yang, Gwang-Hyeok;Choi, Sang-Min;Choe, Eung-Su;Lee, Deok-Won;Kim, Seong-Man
    • 한국연소학회:학술대회논문집
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    • 2004.11a
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    • pp.33-40
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    • 2004
  • Combustion of coke/anthracite in an iron ore sintering bed is characterized quantitatively by introducing newly defined parameters related to propagation and thickness of combustion zone and maximum temperature. The parameters are obtained by sintering pot experiment and I-D, unsteady numerical model which treats solid material as multiple solid phases. Experiments and calculations are performed for various major operating parameters: air inlet velocity, different type of fuels which have different reactivity and diameter of the solid fuel. Effects of the operating parameters on the productivity and quality of the sintering process are investigated and evaluated quantitatively and the results show that optimized air supply rate and diameter of anthracite for replacement of coke can be obtained. This approach can be applied to other kinds of combustors for characterization of the combustion in the solid fuel beds.

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Analysis of physical properties of activated carbon for water purification made by using coal and commercial activated carbon (석탄을 이용하여 제조한 상수처리용 활성탄과 상업용 활성탄의 물성특성 분석)

  • 최동훈;김종수;안철우;이철승;박진식
    • Journal of environmental and Sanitary engineering
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    • v.17 no.2
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    • pp.48-54
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    • 2002
  • In this study, the physical properties of coal-based(bituminous, anthracite·bituminous) activated carbon were compared with those of four different commercial activated carbon used for water treatment. In case of bituminous coal and blend coal, the results of SEM analysis indicated that more pore was extended and shaped in activation process than carbonization process. The results of BET analysis indicated that specific surface area of P Co. activated carbon was larger than the others, and C Co. activated carbon, S Co. activated carbon and anthracite + bituminous was similar. Therefore, adsorption capacities and breakthrough time of anthracite + bituminous regarded similar to C Co. activated carbon.

Co-combustion of Bituminous Coal with Anthracite in a Down-firing, 200 MW Boiler

  • Park, Ho Young;Baek, Se Hyun;Kim, Young Joo;Kim, Tae Hyung;Kim, Hyun Hee;Lim, Hyun Soo;Park, Yoon Hwa
    • KEPCO Journal on Electric Power and Energy
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    • v.1 no.1
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    • pp.93-97
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    • 2015
  • The combustion tests for Korean anthracite-bituminous coal blend were carried out in the 200 MW utility boiler. The burning characteristics of the blend were studied with a thermogravimetric analyzer (TGA). From the observation of TGA burning profiles, it was found that the presence of bituminous coal in the blend appeared to enhance the reactivity of anthracite in the higher temperature region, indicating certain interactions between the two coals. The plant test showed the boiler operation was reasonably stable with somewhat poor combustion efficiency, and some modification of the combustion environment in the furnace is necessitate for the further stable plant operation.

국내 무연탄 발전소 혼소율 변화에 따른 탈황 특성 연구

  • Kim, Jeong-Yu;Park, Dae-Yeong;Lee, Jae-Heon;Mun, Seung-Jae
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.84-87
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    • 2008
  • The sulfur oxides is one of important materials to come about air pollution at thermal plant consuming fossil fuel. The several flue gas desulfurization equipments are installed and operated to decrease sulfur oxides. The flue gas desulfurization of our thermal plant is designed for optimizing flue gas desulfurization technical development and research by Korea Electric Power Research Institute. We operate this desulfurization equipment. Now, our country imports nearly 97 percentage of the energy source and competes with the world for the energy because of the rise of raw materials cost. The fuel cost decrease of power plants is the most important factor of the operation. The fuel used in the experiment is the domestic anthracite from Kangwon Taeback and the bituminous coal from Russia,Taldinsky Mine. This Study is experimental investigations of desulfurization characteristics for domestic anthracite power plant by increasing bituminous coal. We surveyed possible parameters and conducted the performance about desulfurization equipment in Y.D thermal power plant.

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Absorption Ratio and Density Properties According to Absorbent Type Based on Magnesium Oxide Matrix (산화마그네슘 경화체 기반 흡착재 종류에 따른 밀도 및 흡수율 특성)

  • Gwon, Oh-Han;Pyeon, Su-Jung;Lim, Hyun-Ung;Kyung, In-soo;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.182-183
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    • 2017
  • This research identifies radon gas absorption mechanism by adsorption materials, replacing gypsum board with radon emissions, the density and absorption rates of magnesium were carried out using vermiculite, anthracite, powdered active carbon, bentonite, illite, diatomite as a basic study on the fire resistance type of radon Gas reduction type with absorption and decomposition. As a result of the experiment, diatomite showed the lowest density, and the highestt value was the highest. For the absorption rate, bentonite showed the highest absorption rate, and the anthracite showed the lowest absorption rate.

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Characteristics on Chemical Activation and VOCs Adsorption of Activated Carbon according to Mixing Ratio of Anthracite and Lignite (활성탄 제조시 유·무연탄 혼합에 따른 화학적 활성화 및 휘발성유기화합물 흡착 특성)

  • Cho, Joon-Hyung;Kang, Sung-Kyu;Kang, Min-Kyoung;Cho, Kuk;Oh, Kwang-Joong
    • Clean Technology
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    • v.23 no.4
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    • pp.364-377
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    • 2017
  • In this study, to improve the low surface area of domestic anthracite as raw materials of activated carbon, characteristics on chemical activation and VOCs adsorption of activated carbon according to mixing ratio of anthracite and lignite. For these, properties of raw materials, parameter characteristics of preparation processes for activated carbon, and VOCs adsorption characteristic of the prepared activated carbon are analyzed. The experimental results showed that, the domestic anthracite had disadvantages of high contents for ash and lead, arsenic, which were exceeded for the heavy metal limits, in the properties of raw materials. To improve these diadvantages, using the mixing ratio of anthracite and lignite, and the optimum conditions for pretreatment, activation, washing, and pellitization process, the activated carbon had a range of BET (Brunauer-Emmett-Teller) surface area of $1,154{\sim}1,420m^2g^{-1}$ with mesopore development and hydrophobic surface property. The carbons were satisfied with the quality standard for granular activated carbon, and had similar physicochemical properties with the commercial activated carbon. The minimum mixing condition for commercial VOCs activated carbon performance must have the caloric value of above $5,640kcal\;kg^{-1}$, and the carbon had higher adsorption capacity with order of xylene > toluene > benzene according to more higher molcular weight and hydrophobic property.