• Title/Summary/Keyword: 혼소발전

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Status and Perspective of Biomass Co-firing to Pulverized Coal Power Plants (미분탄 석탄화력발전에서의 바이오매스 혼소 동향 및 전망)

  • Yang, Won
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.4
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    • pp.525-529
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    • 2016
  • Biomass co-firing to existing thermal power plants is one of the most economical and efficient way to reduce $CO_2$ emission from the plant. There are several methods of co-firing and it can be categorized into (1) Parallel co-firing, (2) Indirect co-firing, and (3) Direct co-firing. Parallel co-firing is the most expensive way to high-ratio co-firing because it requires biomass dedicated boiler. Direct co-firing is widely used because it does not need high capital cost compared with the other two methods. Regarding the direct co-firing, it can be classified into three methods- Method 1 does not need retrofit of the facilities because it uses existing coal mills for pulverizing biomass fuels. In this case high-ratio co-firing cannot be achieved because of poor grindability of biomass fuels. Method 2 needs biomass-dedicated mills and revision of fuel streams for the combustion system, and Method 3 needs additional retrofit of the boiler as well as biomass mills. It can achieve highest share of the biomass co-firing compared with other two methods. In Korea, many coal power plants have been adopting Method 1 for coping with RPS(Renewable portfolio standards). Higher co-firing ratio (> 5% thermal share) has not been considered in Korean power plants due to policy of limitation in biomass co-firing for securing REC(Renewable Energy Certificate). On the other hand, higher-share co-firing of biomass is widely used in Europe and US using biomass dedicated mills, following their policy to enhance utilization of renewable energy in those countries. Technical problems which can be caused by increasing share of the biomass in coal power plants are summarized and discussed in this report. $CO_2$ abatement will become more and more critical issues for coal power plants since Paris agreement(2015) and demand of higher share of biomass in the coal power plants will be rapidly increased in Korea as well. Torrefaction of the biomass can be one of the best options because torrefied biomass has higher heating value and grindability than other biomass fuels. Perspective of the biomass torrefaction for co-firing is discussed, and economic feasibility of biomass torrefaction will be crucial for implementation of this technology.

Development of Economic Prediction Model for Internal Combustion Engine by Dual Fuel Generation (내연기관엔진의 가스혼소발전 경제성 예측모델 개발)

  • HUR, KWANG-BEOM;JANG, HYUCK-JUN;LEE, HYEONG-WON
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.4
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    • pp.380-386
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    • 2020
  • This paper represents an analysis of the economic impact of firing natural gas/diesel and natural gas/by-product oil mixtures in diesel engine power plants. The objects of analysis is a power plant with electricity generation capacity (300 kW). Using performance data of original diesel engines, the fuel consumption characteristics of the duel fuel engines were simulated. Then, economic assessment was carried out using the performance data and the net present value method. A special focus was given to the evaluation of fuel cost saving when firing natural gas/diesel and natural gas/by-product oil mixtures instead of the pure diesel firing case. Analyses were performed by assuming fuel price changes in the market as well as by using current prices. The analysis results showed that co-firing of natural gas/diesel and natural gas/by-product oil would provide considerable fuel cost saving, leading to meaningful economic benefits.

A Study on mechanical safety of emergency generator by bi-fuel system (비상발전기 혼소시스템 구축에 따른 기계적 안전성에 관한 연구)

  • Lim, Hyun-Sung;Han, Woon-Ki;Jung, Jin-Soo;Park, Chan-Urm;Song, Young-Sang;Cho, Sung-Koo
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1555-1556
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    • 2015
  • 최근 증가하는 전력 수요로 인하여 전국에 분포되어 있는 비상발전기를 활용하는 방안이 대두되고 있다. 전국에 설치되어 있는 비상발전기의 대부분은 디젤 연료를 기반으로 운전되고 있으며 가동 시 매연 및 경제성이 낮은 단점을 가지고 있다. 이에 최근 디젤 연료에 가스 연료를 혼합하여 발전하는 혼소시스템이 보급되고 있다. 본 논문에서는 비상발전기의 혼소시스템 구축 시 기계적 안전성을 검증하고자 한다.

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An Experimental Study on NOx Emissions with Hydrogen and Natural gas Co-firing for EV burner of GT24 (GT24 가스터빈용 EV 버너의 수소혼소에 따른 질소산화물 배출 특성에 대한 실험적 연구)

  • Jeongjae Hwang;Won June Lee;Kyungwook Min;Do Won Kang;Han Seo Kim;Min Kuk Kim
    • Journal of the Korean Institute of Gas
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    • v.27 no.4
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    • pp.85-91
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    • 2023
  • In this study, an experimental study was conducted on the flame behavior, combustion dynamics, and NOx emission characteristics for hydrogen co-firing with the EV burner which is the first stage combustor of GT24. It was confirmed that as the hydrogen co-firing rate increases, the NOx emission increases. This change was elucidate to be the result of a combination of changes in penetration depth due to changes in fuel density, reduction in fuel mixing due to changes in flame position due to increased flame propagation speed, and oscillation of fuel mixedness due to combustion instability. Through pressurization tests in the range of 1.3 to 3.1 bar, NOx emission characteristics under high-pressure operating conditions were predicted, and based on this, the hydrogen co-firing limits of the EV burner was evaluated.

The Study of Economic Feasibility of Wood Pellet in Domestic Power Plants Sector (국내 발전부문에서의 목재펠릿 경제성 연구)

  • Jeong, Nam-Young;Kim, Lae-Hyun
    • Journal of Energy Engineering
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    • v.19 no.4
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    • pp.251-257
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    • 2010
  • Korea have a plan to enforce the Renewable Portfolio Standard(RPS) in 2012 for climate change action and effective use of energy but because of lack of renewable energy resources and limits of technology development, it will be hard to fullfill a target for RPS obligation in domestic power generation sector and woodchip biomass cofiring with coal combustion is the one of the alternative methods of the goal. Woodchip biomass cofiring with coal combustion is easy to approach technical design and has competitiveness of $CO_2$ & renewble energy certificate benefit and also has much lower generation cost than any other renewable energy resources. Because of that reason, woodchip biomass cofiring with coal combustion should be needed to fullfill the goal for RPS obligation in domestic power generation sector with midlong-term direction.

A Numerical Study on Performance of a Heavy-Duty Diesel engine for Power Generation under Natural Gas-Diesel Dual Fuel Operation (발전용 대형 디젤 엔진의 천연가스-디젤혼소 운전 특성에 대한 수치해석 연구)

  • Cho, Jungkeun;Park, Sangjun;Song, Soonho;Hur, Kwang-Beom
    • Journal of the Korean Institute of Gas
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    • v.19 no.2
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    • pp.29-36
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    • 2015
  • This study is an 1-D numerical study prior to modification of diesel engine for power plants to natural gas/diesel dual fuel engine using GT-Power with 1.5MW diesel engine for power generation. Natural gas injector was installed to intake manifold for dual fuel engine model. Effects on engine performance and characteristics were investigated when dual fuel is used in unmodified diesel engine. The analysis was done under 5 conditions from 0% to 40% of mixing rate on 720RPM engine speed. As a result of research, the engine performance was decreased as increasing ratio of natural gas. Engine brake power was decreased by 18.4% under 40% mixing rate condition. To clarify the reason, effects of injection timing and period were evaluated with DOE method. Considering this result, optimization was done for these parameters. Also, comparison between performances of dual fueled engine and diesel engine was made after optimizing the timing of injection by DOE method. As a result, engine brake power was decreased by 8.55% under mixing rate 40% condition showing 12.5% improvement.

Characteristics of Co-Combustion of Wood Pellet with Sub-Bituminus Coal in A Pilot CFB Combustor (Pilot 순환유동층 연소장치에서의 목재펠릿과 아역청탄 혼소 특성)

  • KIM, DONG WON;PARK, KYEONG IL;LEE, JONG MIN;BAE, YONG CHAE
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.5
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    • pp.436-447
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    • 2019
  • The circulating fluidized bed boiler has an advantage that can burn a variety of fuels from low-grade fuel to coal. In this study, for the design of a circulating fluidized bed boiler using wood pellets, a circulating fluidized bed combustion test device using no external heater was manufactured and used. According to the increase of co-combustion rate with wood pellet, combustion fraction and heat flux by combustor height were measured and pollutant emission characteristics were analyzed. In terms of combustibility, the effect on primary and secondary air ratio were also studied. In addition, as a result of analysis of the effect of corrosive nanoparticles on the combustion of coal with wood pellets, it was confirmed that coal is mostly composed of Ca and S, whereas wood pellets are mostly composed of K, Cl, and Na.