• Title/Summary/Keyword: Coal-fired plant

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Reduction of unburned carbon derived from coal-fired power plant by changing operating conditions (운전조건병경에 의한 미분탄화력의 미연분 저감)

  • Park, Ho-Young;Kim, Young-Ju;Yu, Guen-Sil;Kim, Chun-Kun;Kim, Dong-Hun
    • 한국연소학회:학술대회논문집
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    • 2006.10a
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    • pp.299-303
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    • 2006
  • From the analysis of fly ash, which contains unburned carbon, collected from the coal-fired Yong Hung power station, most particles are turned out to be hollow cenosphere and agglomerated soot particles. The sooting potential from six coals used in the plant were investigated with CPD model. The results show that the higher potential presented to Peabody, Arthur, Shenhua coals rather than other coals. It is necessary to measure the coal flow rates at each coal feeding pipe for four burner levels since they affect the extent of mixing of soot with oxidant, in turn, the oxidation rate of soot particles. The unbalance in coal flow rate was found in several coal pipes. We successfully reduced unburned carbon in ash by increasing the excess air and changing the SOFA yaw angle.

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Economic analysis of biomass torrefaction plants integrated with corn ethanol plants and coal-fired power plants

  • Tiffany, Douglas G.;Lee, Won Fy;Morey, Vance;Kaliyan, Nalladurai
    • Advances in Energy Research
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    • v.1 no.2
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    • pp.127-146
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    • 2013
  • Torrefaction technologies convert assorted biomass feedstocks into energy-concentrated, carbon neutral fuel that is economically transported and easily ground for blending with fossil coals at numerous power plants around the world without needs to retrofit. Utilization of torrefied biomass in conventional electric generating units may be an increasingly attractive alternative for electricity generation as aging power plants in the world need to be upgraded or improved. This paper examines the economic feasibility of torrefaction in different scenarios by modeling torrefaction plants producing 136,078 t/year (150,000 ton/year) biocoal from wood and corn stover. The utilization of biocoal blends in existing coal-fired power plants is modeled to determine the demand for this fuel in the context of emerging policies regulating emissions from coal in the U.S. setting. Opportunities to co-locate torrefaction facilities adjacent to corn ethanol plants and coal-fired power plants are explored as means to improve economics for collaborating businesses. Life cycle analysis was conducted in parallel to this economic study and was used to determine environmental impacts of converting biomass to biocoal for blending in coal-fired power plants as well as the use of substantial flows of off-gasses produced in the torrefaction process. Sensitivity analysis of the financial rates of return of the different businesses has been performed to measure impacts of different factors, whether input prices, output prices, or policy measures that render costs or rewards for the businesses.

A Study on the Development of the Mercury Emission Factor from Coal-fired Power Plant (석탄 화력발전시설에서의 수은 배출계수 개발에 관한 연구)

  • Kim, Hyung-Chun;Park, Jung-Min;Jang, Kee-Won;Lee, Sang-Bo;Jung, No-El;Song, Deok-Jong;Hong, Ji-Hyung;Lee, Suk-Jo;Kim, Sang-Kyun
    • Journal of Korean Society for Atmospheric Environment
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    • v.28 no.2
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    • pp.172-181
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    • 2012
  • Mercury is one of the most hazardous air pollutants. Recently, mercury has been a concern in domestic and overseas because it has lethal toxicity, long distance transport, persistence and bioaccumulation in the environment. Stationary combustion sources such as coal-fired power plants, waste incinerators, and cement kilns are the major sources of mercury emissions. The objectives of this study were to measure the concentration for mercury from coal-fired power plants and to calculate emission factor to estimate its emission. The results showed that the mercury concentrations in the flue gas were 1.63-3.03 mg/$Sm^3$ in anthracite-fired power plants (average 2.32 mg/$Sm^3$) and 1.95-3.33 mg/$Sm^3$ in bituminous-fired power plants (average 2.6 mg/$Sm^3$). Mercury emission factor was estimated as 25.74 mg/ton for anthracite-fired power plants and 12.48 mg/ton for bituminous-fired power plants. Because actual measurements are limited in quantity, it is desirable to refine our estimates by extending the actual measurements.

A techno-economic analysis of partial repowering of a 210 MW coal fired power plant

  • Samanta, Samiran;Ghosh, Sudip
    • Advances in Energy Research
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    • v.3 no.3
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    • pp.167-179
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    • 2015
  • This paper presents a techno-economic analysis of a partial repowering scheme for an existing 210 MW coal fired power plant by integrating a gas turbine and by employing waste heat recovery. In this repowering scheme, one of the four operating coal mills is taken out and a new natural gas fired gas turbine (GT) block is considered to be integrated, whose exhaust is fed to the furnace of the existing boiler. Feedwater heating is proposed through the utilization of waste heat of the boiler exhaust gas. From the thermodynamic analysis it is seen that the proposed repowering scheme helps to increase the plant capacity by about 28% and the overall efficiency by 27%. It also results in 21% reduction in the plant heat rate and 29% reduction in the specific $CO_2$ emissions. The economic analysis reveals that the partial repowering scheme is cost effective resulting in a reduction of the unit cost of electricity (UCOE) by 8.4%. The economic analysis further shows that the UCOE of the repowered plant is lower than that of a new green-field power plant of similar capacity.

The Local Effects of Coal-fired Power Plant Shutdown on PM2.5 Concentration: Evidence from a Policy Experiment in Korea (노후 석탄화력발전소 가동중단에 따른 발전소 주변지역의 초미세먼지 농도 감소효과 분석)

  • Yi, Donggyu;Sung, Jae-hoon
    • Environmental and Resource Economics Review
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    • v.27 no.2
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    • pp.315-337
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    • 2018
  • Korean government temporarily shut down the coal-fired power plants built before 30 years and more from 6/1/2017 to 6/31/2017. This treatment provides a credible natural experiment regarding the regional $PM_{2.5}$ concentration and coal-fired generators. Based on this feature of the treatment, this study analyzed the causality between the old coal-fired power plants and regional $PM_{2.5}$ concentration. To be specific, we categorized two pollution monitoring stations nearby coal-fired power plants in Yeongdong into a treatment station and a control station based on the distance from the power plants. The control station is similar to the treatment station geographically and topographically, but its $PM_{2.5}$ concentration would not be directly affected by coal-fired power plants in Yeongdong. A difference-in-difference method was applied to identify the effects of the old coal-fire power plants on regional $PM_{2.5}$ concentration. The results show that the temporary shutdown would decrease $PM_{2.5}$ concentration nearby coal-fired power plants in Yeongdong by $3.7{\sim}4.4{\mu}g/m^3$.

The improvement for steam temperature control at Boryung bituminous coal-fired drum boiler type thermal power plant (유연탄연소 드럼타입 보일러를 채택한 발전프랜트의 효율적 온도제어에 관한 연구)

  • 류홍우;황재호
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10a
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    • pp.693-696
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    • 1988
  • This paper is investigated on the improvement for steam temperature control at Boryung coal-fired drum boiler type thermal power plant. The steam temperatur control has been mainly operated by the feedback controllers. Automatic controllers are bounded and difficult. Because boiler system is nonlinear and the system time delay is very large. Optimal regulators including predictive feedforward and differentiate control are synthesized and some improved output results are presented.

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Energy Economics of Nuclear and Coal Fired Power Plant (원자력과 화력 발전소간의 에너지 비교 분석)

  • Lee, Gi-Won;Cho, Joo-Hyun;Kim, Seong-Rae;Park, Hae-Yun
    • Nuclear Engineering and Technology
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    • v.27 no.3
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    • pp.403-417
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    • 1995
  • The upturn of Korean nuclear power program can be considered to have started in early 70's while future plants for the construction of new nuclear power plane virtually came to a halt in United States. It is projected that power plant systems from combination of nuclear and coal fired types might shift to all coal fired type, considering the current trend of construction on the new Plants in the United States. However, with the depletion of natural resources, it is desirable to understand the utilization of two competitive utility technologies in terms of invested energy. Presented in this paper is a comparison between two systems, nuclear power plant and coal fired steam power plant in terms of energy investment. The method of comparison is Net Energy Analysis (NEA). In doing so, Input-Output Analysis (IOA) among industries and commodities is done. Using these information, net energy ratios are calculated and compared. NEA is conducted for power plants in U. S. because the availability of necessary data are limited in Korea. Although NEA does not offer conclusive solution, this method can work as a screening process in decision making. When considering energy systems, results from such analysis can be used as a general guideline.

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Elemental components analysis according to the size of fine particles emitted from a coal-fired power plant using an ejector-porous tube dilution sampling and ELPI (이젝터-다공튜브 희석 샘플링과 ELPI를 이용한 석탄화력발전소 배출 미세먼지의 입자 크기에 따른 성분 분석)

  • Shin, Dongho;Park, Daehoon;Joe, Yunhui;Kim, Younghun;Hong, Kee-Jung;Lee, Gunhee;Han, Bangwoo;Hwang, Jungho
    • Particle and aerosol research
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    • v.18 no.3
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    • pp.69-77
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    • 2022
  • In order to understand the characteristics of fine particles emitted from coal-fired power plant stacks, it is important to analyze the size distribution and components of particles. In this study, particle size distributions were measured using the ejector-porous tube dilution device and an ELPI system at a stack in a coal-fired power plant. Main elemental components of particles in each size interval were also identified through TEM-EDS analysis for the particles collected in each ELPI stage. Particle size distributions based on number and mass were analyzed with component distributions from 0.006 to 10 ㎛. The highest number concentration was about 0.01 ㎛. The main component of the particles consisted of sulfur, which indicated that sulfate aerosols were generated by gas-to-particle conversion of SO2. In a mass size distribution, a mono-modal distribution with a mode diameter of about 2 ㎛ was shown. For the components of PM1.0 (particles less than 1 ㎛), the abundance order was F > Mg > S > Ca, and however, for the components of PM10 (particles less than 10 ㎛), it was in the order of Fe > S > Ca > Mg. The elemental components by particle size were confirmed.

Approach to Reduce CO2 by Renewable Fuel Cofiring for a Pulverized Coal Fired Boiler (신재생연료 혼소를 통한 미분탄 화력 발전소의 CO2 저감 방안 도출)

  • Kim, Taehyun;Choi, Sangmin;Yang, Won
    • 한국연소학회:학술대회논문집
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    • 2013.06a
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    • pp.19-20
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    • 2013
  • The cofiring of renewable fuel in coal fired boilers is an attractive option to mitigate $CO_2$ emissions, since it is relatively low cost option for efficiently converting renewable fuel to electricity by adding biomass as partial substitute of coal. However, it would lead to reduce plant efficiency and flexibility in operation, and increase operation cost and capital cost associated with renewable fuels handling and firing equipment. The aim of this study is to investigate reduction of carbon dioxide at varying percentage of biomass in fuel blend to the boiler biomass, and estimate operation and capital cost. Wood pellet, PKS (palm kernel shell), EFB (empty fruit bunch) and sludge are considered as a renewable fuels for a cofiring with coal. Several approaches by the cofiring ratio are chosen from past plant demonstrations and commercial cofiring operation, and they are evaluated and discussed for CO2 reduction and cost estimation.

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Study of the Environment Priority Facility Operation Concept of 500MW Standard Coal Thermal Power Plant (500MW 표준석탄화력발전소의 환경안전우선 설비운영개념 도입방안 고찰)

  • Lee, Kab-Ju;Chung, Jin-Do;Kim, San
    • Journal of the Korea Safety Management & Science
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    • v.24 no.2
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    • pp.1-9
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    • 2022
  • In korea, 500MW standard coal fired power plants were designed and operated for the initial base load, so facility stability was prioritized from facility problem to treatment, but now we needed to research for minimizing greehouse gas emissions at the operation of coal fired power plants. research on various facilities and technologies was actively conducted to reduce environment pollutants was drastically reduced, but research and attempts on coping measures in the event of a reduction facility problem were in sufficient. this study considered investigated ways to minimized pollutants by quickly responding to logic development and application of the load runback concept in case of serious problems with environmental pollutant reduction facilities such as NOx reduction selective catalytic reduction facilities, SOx reduction wet flue gas desulpherisation facilities, and TSP(Total Suspended Particles) collection low temperature electric precipitator.