• Title/Summary/Keyword: anthracite

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Co-combustion Characteristics of Mixed Coal with Anthracite and Bituminous in a Circulating Fluidized Bed Boiler (순환유동층 보일러에서 무연탄-유연탄의 혼합연소 특성)

  • Jeong, Eui-Dae;Moon, Seung-Jae
    • Plant Journal
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    • v.6 no.2
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    • pp.70-77
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    • 2010
  • This study investigated the characteristics of co-combustion of mixed anthracite (domestic and Vietnam) and bituminous coal (Sonoma, Australia) at circulating fluidized bed boiler in Donghae thermal power plant when mixing ratio of bituminous coal is variable. Co-combustion of bituminous coal contributes to improvement in general combustion characteristics such as moderately retaining temperature of furnace and recycle loop, reducing unburned carbon powder, and reducing discharge concentration of NOx and limestone supply owing to improvement in anthracite combustibility as the mixing ratio was increased. However, bed materials were needed to be added externally when the mixing ratio exceeded 40% because of reduction in generating bed materials based on reduction in ash production. When co-combustion was conducted in the section of 40 to 60% in the mixing ratio while the supplied particles of bituminous coal was increased from 6 mm to 10 mm, continuous operation was shown to be possible with upper differential pressure of 100 mmH2O (0.98 kPa) and more without addition of bed materials for the co-combustion of mixed anthracite and bituminous coal (to 50% or less of the ratio) and that of domestic coal and bituminous coal (to 60% of the ratio).

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A study on the removal of the water from the anthracite slurry by Oil Agglomeration Prosess(partI) (Oil Agglomeration Process에 의한 무연탄 슬러리의 탈수에 관한 연구(제1보))

  • 권이동;신강호;조동성
    • Resources Recycling
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    • v.2 no.2
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    • pp.39-44
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    • 1993
  • This study was carried out to remove the water from low grade anthracite slurry produced at Eoryong coal mine by the oil agglomeration process. 80% of Anthracite as a coal oil mixture (COM) was separated from water by the difference of specific gravity. Then, the amount of kerosene, diesel oil, and heavy oil forming COM was 10% of the amount of sample, respectively. The recovery rate of combustibles and ash content of agglomerated anthracite were affected largely by the amount of added oil, pulp density, particle size, mixing time, and impeller speed. The recovery rate of combustibles was increased to 95% and ash content was decrea-sed from 30% to 13.5% under the optimum conditions.

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Desulfurization Characteristics of Domestic Anthracite by Limes at Bench Scale Pressurized Fluidized Bed Combustor . (벤치규모 가압유동층연소로에서 석회석에 의한 국내무연탄의 탈황특성)

  • Han, Geun-Hui;Ryu, Jeong-In;Jin, Gyeong-Tae
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.25 no.10
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    • pp.1373-1383
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    • 2001
  • The desulfurization characteristics of anthracite in a bench scale pressurized fluidized bed combustor are investigated. The coal used in the experiment is domestic anthracite from Kangwon Taeback area. The desulphurization experiment is performed with limestone from Chungbuk Danyang. The pressure of the combustor is maintained at 6 atm, and the combustion temperatures are 850, 900, and 950$\^{C}$. The superficial gas velocities are 0.9, 1.1, and 1.3 m/s. The excess air ratio is varied from 5 to 35%. The Ca/S mole ratios are 0.5, 1.5, 2.5 and 4.5 mole. All experiments are executed at 2m bed height. Consequently, SO$_2$ concentration in the flue gas is increased with incresing bed temperature and superficial gas velocity. However SO$_2$ concentration is decreased with incresing excess air ratio and Ca/S mole ratio.

Adsorption Characteristics of As and Se Ions by HTMAB Modified Anthracite (HTMAB로 표면처리된 안트라사이트에 의한 비소 및 셀렌 이온의 흡착 특성)

  • Kim, Jeung-Bea
    • Journal of Environmental Science International
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    • v.27 no.3
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    • pp.167-177
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    • 2018
  • The removal characteristics of As and Se ions from aqueous solution by hexadecyl trimethyl ammonium bromide (HTMAB) modified anthracite (HTMAB-AT) were investigated under various conditions of contact time, pH and temperature. When the pH is 6, the zeta potential value of anthracite (AT) is -24 mV and on the other hand, the zeta potential value of the HTMAB-AT is +44 mV. It can be seen that the overall increase of about 60 mV. Increasing the (+) potential value indicates that the surface of the adsorbent had a stronger positive charge, so adsorption for the anion metal was increased. The isotherm data was well described by Langmuir and Temkin isotherm model. The maximum adsorption capacity was found to be 7.81 and 6.89 mg/g for As and Se ions from the Langmuir isotherm model at 298 K, respectively. The kinetic data was tested using pseudo first and pseudo second order models. The results indicated that adsorption fitted well with the pseudo second order kinetic model. The mechanism of the adsorption process showed that adsorption was dependent on intra particle diffusion model according to two step diffusion. The thermodynamic parameters(${\Delta}G^{\circ}$, ${\Delta}H^{\circ}$, and ${\Delta}S^{\circ}$) were also determined using the equilibrium constant value obtained at different temperatures. The thermodynamic parameters indicated that the adsorption process was physisorption, and also an endothermic and spontaneous process.

Assessment of potential environmental impact from fly ash landfill (국내 석탄회 육상매립의 오염 잠재성 평가)

  • Lee, Sang Hoon
    • Journal of Environmental Impact Assessment
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    • v.8 no.4
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    • pp.25-35
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    • 1999
  • Fly ash, by-product from coal fired power station, has long been regarded as a potential contamination source for heavy metals and inorganics due to their enriched concentrations and associations with particle surface. Feed coal and fly ash samples were collected from two power stations; Yongdong deliang with domestic anthracite coals and Boryong with imported bituminous coals. The coal and fly ash samples were analyzed for chemical composition and mineral components, using XRF and XRD. Batch leaching experiments were conducted by agitating samples with deionised water for 24 hours. Anthracite coals are generally higher in Al and Si contents than bituminous coals. This is due to the higher ash contents of the anthracite coal than bituminous coal. The chemistry of the two fly ash samples shows broadly similar compositions each other, except for the characteristically high contents of Cr in anthracite coal fly ash. Leaching experiments revealed that concentrations of metals gradually decreased with leachings in general. However, measurable amounts of metals were present in the effluent from weathered ash and the samples subjected to the leaching procedure. These metals are likely to indicate that the metals in fly ash were incorporated into glass fraction as well as associated with particle surface of samples. Dissolution of aluminosilicate glass would control releasing heavy metals from fly ash as weathering progresses during landfill with implication of possible groundwater contamination through fly ash landfill.

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Characteristic Evaluation of RDF for the Combined Drying Produced by Weight Mixing Ratio Use Chemical Wastewater Sludge and Anthracite Coal (화학폐수슬러지와 무연탄을 이용한 복합건조공정의 조사시간에 따른 고형연료의 특성 평가)

  • Lee, Seung-Chul;Jung, Jin-Hee;Lee, Jun-Hee
    • Journal of Environmental Science International
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    • v.25 no.3
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    • pp.417-424
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    • 2016
  • The objective of this study was to evaluate the microwave drying characteristics of mixtures of chemical wastewater sludge (70~90%) and anthracite coal (10~30%) with respect to physical and economic factors such as mass, volume reduction, moisture content, drying rate and heating value when the wastes were dried at different weight mixing ratio and for different microwave irradiation time. The drying process were carried out in a microwave oven, the combined drying process with a 2,450 MHz frequency and 1 kW of power. Maximum dry rates per unit area on the microwave drying of mixtures with chemical wastewater sludge and anthracite coal were $35.5kg\;H_2O/m^2{\cdot}hr$ for Cs90-Ac10; $40.1kg\;H_2O/m^2{\cdot}hr$ for Cs80-Ac20 and $35.0kg\;H_2O/m^2{\cdot}hr$ for Cs70-Ac30. The result clearly indicated that moisture can be effectively and inexpensively removed from the wastes through use of the microwave drying process.

Desulfurization Characteristics for Anthracite Coal Power Plant by Increasing Bituminous Coal Fuel (국내 무연탄 발전소 역청탄 사용시 탈황 특성 연구)

  • Kim, Jeong-You;Moon, Seung-Jae;Lee, Jae-Heon
    • Plant Journal
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    • v.4 no.4
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    • pp.71-77
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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 sudden 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 Taldinsky Mine in Russia. 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 Yong Dong thermal power plant.

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The influence of factors on the strength of formed coke made with anthracite and phenolic resin (무연탄(無煙炭)과 페놀수지(樹脂)의 혼합(混合)소성에 의해 제조(製造)된 함형(咸形)코크스의 강도(强度))

  • Lee, Gye-Seung;Song, Young-Jun
    • Resources Recycling
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    • v.17 no.6
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    • pp.57-61
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    • 2008
  • The aim of this study is to produce the coke which can be used for the production of ferroalloy, by mixing phenolic resin and anthracite and sintering it. The influence of factors on the strength of coke were investigated. The results of this study are as follows: It is found that the anthracite coke of $100{\sim}150\;kgf/cm^2$ strength for ferroalloy can be made by a series of process as follows; Mixing homogeneously 6% liquefied phenolic resin and 6% water with $35{\sim}325$ mesh anthracite of low ash content. Making pellet by press the mixture in $10-50\;kgf/cm^2$ pressure. Dehydrating the pellet for 6 hrs at $50^{\circ}C$, and hardening it for 180 min at $200^{\circ}C$. Sinter the mixture for 6 hrs at $1,200^{\circ}C$.

Combustion and Emission Characteristics of Utility Boiler burning Anthracite-Bituminous Coal Blends (발전용 보일러에서의 유, 무연탄 혼소시 연소 및 환경특성)

  • Park, Ho-Young;Kim, Young-Joo;Park, Hyun-Joo;Kim, Sung-Chul
    • Journal of Energy Engineering
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    • v.17 no.3
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    • pp.153-160
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    • 2008
  • The combustion behaviors of the blends of Korean anthracite, bituminous coal and their blends were studied with a thermogravimetric analyzer. Concerning the burning profiles of the anthracite-bituminous coal blends in TGA, it has been observed the independent burning of two coals without any interaction between two coals. With the blends of 50% anthracite with 50% bituminous coal in weight basis, the combustion tests in a utility boiler have been carried out for the analysis of the combustion and operational characteristics by increasing the power output from 134 MW to 197 MW. The stable combustion has been observed in a boiler. With the increase of power output, the exhaust gas temperature was exceeded the design value of $430^{\circ}C$, so the combustion air was taken from atmosphere instead of the boiler penthouse.

Combustion Characteristics and Activation Energy From Thermogravimetric Analysis of Bituminous and Anthracite Coal (TGA에 의한 유.무연탄의 연소특성과 활성화에너지 비교)

  • 김성철;최병선;이현동;홍성선
    • Journal of Energy Engineering
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    • v.5 no.2
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    • pp.170-175
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    • 1996
  • This study is to determined the activation energy from TGA experimental data for the bituminous and anthracite coals of three kinds which are being used in the domestic coal-fired power plants. TGA experimental data indicate that the weight loss temperature of bituminous coal is 200$^{\circ}C$ higher than that of anthracite coal. Activation energy of bituminous coal is in the range of 14∼20 Kcal/mole compared with 37∼55 Kcal/mole of anthracite coal. A reduction of particle size of coals results in the decrease of activation energy and activation energy has a good correlation with the weight loss percent of coal in the TGA experiment. Addition of CaCO$_3$ on anthracite coal caused to decrease the activation energy of 1∼23 Kcal/mole while activation energy of bituminous coal do not change significantly.

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