• Title/Summary/Keyword: Generation Fuel Cost

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An Application of Harmony Search Algorithm for Operational Cost Minimization of MicroGrid System (마이크로 그리드 운영비용 최소화를 위한 Harmony Search 알고리즘 응용)

  • Rhee, Sang-Bong;Kim, Kyu-Ho;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.7
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    • pp.1287-1293
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    • 2009
  • This paper presents an application of Harmony Search (HM) meta-heuristic optimization algorithm for optimal operation of microgrid system. The microgrid system considered in this paper consists of a wind turbine, a diesel generator, and a fuel cell. An one day load profile which divided 20 minute data and wind resource for wind turbine generator were used for the study. In optimization, the HS algorithm is used for solving the problem of microgrid system operation which a various generation resources are available to meet the customer load demand with minimum operating cost. The application of HS algorithm to optimal operation of microgrid proves its effectiveness to determine optimally the generating resources without any differences of load mismatch and having its nature of fast convergency time as compared to other optimization method.

Cost Policy Effects of Economic Feasibility of 1kw household PEMFC System (요금 정책이 PEMFC 시스템 경제성에 미치는 영향)

  • Kim, Ki-Young;Hwang, Nam-Sun;Kong, Min-Seok;Kim, Hee-Su;Oh, Si-Doek
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.11a
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    • pp.31-34
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    • 2007
  • Fuel cell with high electric efficiency has many probabilities of commercial use. Especially, polymer electrolyte or proton exchange membrane fuel cell (PEMFC) which is a low operating temperature and has less influence on $CO_2$ concentration is considered the power generation system of small building and household. We calculated the optimal operational plans of 1 kW household PEMFC power system based on daily electric and heat demand patterns of various size of apartments. Calculated results show that the economic feasibility of PEMFC power system is very sensitive to the cost policy of electricity and natural gas.

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Numerical Study on Performance Improvement by Changing of Fuel Injection Timing of Common Rail Diesel Engine for using Electric Generation for Waste Engine Remanufacturing (폐엔진 재제조를 위한 발전용 커먼레일 디젤엔진의 연료분사 타이밍 변경을 통한 성능향상에 대한 수치해석 연구)

  • Kim, Seung Chul;Lee, Suk Young
    • Journal of Energy Engineering
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    • v.27 no.2
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    • pp.49-54
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    • 2018
  • The common rail diesel engine used in this study is a remanufactured waste engine. The fuel injection timing of the waste engine is set to be suitable for the operating conditions of the vehicle. However, the engine of a generator is operated at a constant speed and mainly at partial load. Therefore, it is necessary to change the fuel injection timing suitable for the power generation engine, and the cost and the time required for such change must be minimized as much as possible. As a result of the analysis, it was confirmed that the fuel efficiency improves according to the fuel injection timing suitable for the engine for the generator, thereby increasing the performance and fuel efficiency.

The feasibility analysis for energy utilization of forest biomass (산림 바이오매스의 에너지 활용을 위한 타당성 분석)

  • Kang, Hyeun Koo;Park, Kee Chul;Kim, Lae Hyun
    • Journal of Energy Engineering
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    • v.23 no.1
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    • pp.7-20
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    • 2014
  • The optimal woodchip production system was developed and the production cost of a forest woodchip fuel was calculated for utilizing the pitch pine, which covers around 480,000ha nationwide. the marginal price of the woodchip fuel considering the factor of supply price, electricity and heat selling price as well as capacity factor were suggested and the economic sensitivity analysis was conducted for various scenario. The most important variable which determine economic feasibility was a fuel cost for the power generation facility. If the electricity price is higher than the current SMP(System Marginal Price) or the capacity factor is higher than 80%, there fully is a benefit to consume the woodchip fuels produced in the suggested production system in this study. In addition, the additional benefit becomes more obvious when considering REC(Renewable Energy Certificate) and CDM(Clean Development Mechanism). Therefore, it is strongly suggested for domestic power generation sector to utilize the forest biomass fuel to achieve the obligatory target of RPS.

Economic Feasibility Study for Molten Carbonate Fuel Cells Fed with Biogas

  • Song, Shin-Ae;Han, Jong-Hee;Yoon, Sung-Pil;Nam, Suk-Woo;Oh, In-Hwan;Choi, Dae-Ki
    • Journal of Electrochemical Science and Technology
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    • v.1 no.2
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    • pp.102-111
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    • 2010
  • Molten carbonate fuel cell (MCFC) power plants are one of most attractive electricity generation systems for the use of biogas to generate high-efficiency ultra-clean power. However, MCFCs are considerably more expensive than comparable conventional electricity generation systems. The commercialization of MCFCs has been delayed more than expected. After being effective in the Kyoto protocol and considerably increasing the fossil price, the attention focused on $CO_2$ regression and renewable energy sources has increased dramatically. In particular, the commercialization and application of MCFC systems fed with biogas have been revived because of the characteristics of $CO_2$ collection and fuel variety of MCFCs. Better economic results of MCFC systems fed with biogas are expected because biogas is a relatively inexpensive fuel compared to liquefied natural gas (LNG). However, the pretreatment cost is added when using anaerobic digester gas (ADG), one of the biogases, as a fuel of MCFC systems because it contains high $H_2S$ and other contaminants, which are harmful sources to the MCFC stack in ADG. Thus, an accurate economic analysis and comparison between MCFCs fed with biogas and LNG are very necessary before the installation of an MCFC system fed with biogas in a plant. In this paper, the economic analysis of an MCFC fed with ADG was carried out for various conditions of electricity and fuel price and compared with the case of an MCFC fed with LNG.

Combustion Modeling of Vacuum Residue Fuel Sprays (잔사유 분무 연소 해석에 관한 연구)

  • Choi, Chan-Ho;Huh, Kang-Y.
    • 한국연소학회:학술대회논문집
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    • 2004.06a
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    • pp.207-214
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    • 2004
  • Extra heavy vacuum residue oil has advantage as the fuel of a power plant in reducing the cost of power generation. Numerical study is conducted by the KIVA code to understand combustion, heat transfer and flow field characteristics in the test reactor. The combustion model of pulverized coal particles is adopted as the combustion process of extra heavy oil is similar to that of coal. As an initial phase of investigation parametric study is performed with respect to SMD and spray angle of injected spray droplets.

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Solar Thermal Hybrid Power Generation: technology overview and state of the art in Korea (태양열 복합발전기술의 개요와 국내 연구개발 현황)

  • Kim Jin-Soo;Kang Yong-Heack;Lee Sang-Nam;Yoon Hwan-Ki;Yu Chang-Kyun
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.412-415
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    • 2005
  • Solar thermal power generation is one of promising and well-proven ways to convert solar energy to electricity. Though it requires high initial cost for system construction and continuous efforts for maintainment. it is more positive in terms of efficiency than other solar power generation technologies. Moreover, solar thermal power generation allows additional benefits of cheap thermal storage and easy hybridization with other fossil fuel-driven power generation. Owing to these benefits, large scale solar thermal power generation technology is expected to be competitive to other commercial technologies in the near future. In this paper an overview on the solar thermal hybrid power generation technology and the state of the art in Korea were briefly introduced.

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Single-Phase Utility-Interactive Inverter for Residential Fuel Cell Generation System (가정용 연료전지 발전 시스템을 위한 단상 계통연계형 인버터)

  • Jung, Sang-Min;Bae, Young-Sang;Yu, Tae-Sik;Kim, Hyo-Sung;Choi, Se-Wan
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.1
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    • pp.81-88
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    • 2007
  • In this paper, a new single-phase utility-interactive inverter system for residential power generation with fuel cell is proposed. The proposed inverter system is not only capable of working in both stand-alone and grid-connected mode, but also ensures smooth and automatic transfer between the two modes of operation. The proposed control method has little steady-state error and good transient response characteristic. Also, the control method can be implemented using low-cost, fixed point DSP since it has simpler structure, smaller amount of calculation, and smaller number of sensors. The controller for the proposed utility-interactive inverter system is described, and the validity is verified through simulation and experiment.

Thermal Stress Analysis of Spent Nuclear Fuel Disposal Canister (심지층 고준위 핵폐기물 처분용기의 열응력 해석)

  • 하준용;권영주;최종원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.617-620
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    • 1997
  • In this paper, the thermal stress analysis of spent nuclear fuel disposal canister in a deep repository at 500m underground is done for the underground pressure variation. Since the nuclear fuel disposal usually emits much heat and radiation, its careful treatment is required. And so a long term safe repository at a deep bedrock is used. Under this situation, the canister experiences some mechanical external loads such as hydrostatic pressure of underground water, swelling pressure of bentonite buffer, and the thermal load due to the heat generation of spent nuclear fuel in the basket etc.. Hence, the canister should be designed to designed to withstand these loads. In this paper, the thermal stress analysis is done using the finite element analysis code, NISA.

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Feasibility of Combined Heat and Power Plant based on Fuel Cells using Biogas from Macroalgal Biomass (거대조류 바이오매스로부터 생산된 바이오가스를 사용하는 연료전지 기반 열병합발전의 타당성 검토)

  • Liu, Jay
    • Clean Technology
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    • v.24 no.4
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    • pp.357-364
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    • 2018
  • Studies on the production of biogas from third generation biomass, such as micro- and macroalgae, have been conducted through experiments of various scales. In this paper, we investigated the feasibility of commercialization of integrated combined heat and power (CHP) production using biogas derived from macroalgae, i.e., seaweed biomass. For this purpose, an integrated CHP plant of industrial scale, consisting of solid oxide fuel cells, gas turbine and organic Rankine cycle, was designed and simulated using a commercial process simulator. The cost of each equipment in the plant was estimated through the calculated heat and mass balances from simulation and then the techno-economic analysis was performed. The designed integrated CHP process produces 68.4 MW of power using $36ton\;h^{-1}$ of biogas from $62.5ton\;h^{-1}$ (dry basis) of brown algae. Based on these results, various scenarios were evaluated economically and the levelized electricity cost (LEC) was calculated. When the lifetime of SOFC is 5 years and its stack price is $$225kW^{-1}$, the LEC was 12.26 ¢ $kWh^{-1}$, which is comparable to the conventional fixed power generation.