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Park K.,Seoul National University | Shin D.,Myongji University | Yoon E.S.,Seoul National University | Yoon E.S.,Automation and Systems Research Institute
Energy | Year: 2011

This paper studies the cost of energy (COE) for several emerging, fossil fuel power plants such as an integrated gasification combined cycle (IGCC) power plant, a natural gas combined cycle (NGCC) power plant, and a pulverized coal (PC) power plant under three different scenarios defined by the International Energy Agency (IEA). In order to compare the COE for each power plant more realistically, the concept of the 20-year levelized cost of energy (LCOE) was used. Since previous LCOE analyses did not consider the changes in fuel price and CO2 prices, the reliability of previous LCOE results is not good enough to be acceptable for future energy planning. In this study, modified LCOEs, which consider the changes in fuel and CO2 prices with respect to the different scenarios were suggested in order to increase the reliability of the economic comparisons of emerging, fossil power plants. In addition, energy planning was done in order to present the applicability of the proposed calculation method for the COE. © 2011 Elsevier Ltd. Source


Park K.,Seoul National University | Koo J.,Seoul National University | Shin D.,Myongji University | Lee C.J.,Seoul National University | And 2 more authors.
Korean Journal of Chemical Engineering | Year: 2011

A general mathematical programming formulation which also considers safety factors is presented for solving the multi-floor plant layout problem. In the presence of a risk of physical explosion, the safety distance must be considered to generate more reasonable and safe layouts. The proposed method determines detailed multi-floor process plant layouts using mixed integer linear programming (MILP). To consider the safety distance, a consequence analysis is adopted for calculating an equipment physical explosion probit. As the TNT equivalency method is used, more realistic estimations of equipment damage are possible, generating safer plant layouts. The objective function minimizes the layout cost (total plant area, floor construction costs and connection costs) and explosion damage costs for the multi-floor problem. Two illustrative examples are presented to demonstrate the applicability of the proposed method. © 2011 Korean Institute of Chemical Engineers, Seoul, Korea. Source


Park K.,Seoul National University | Shin D.,Myongji University | Lee G.,Korea National University of Transportation | Yoon E.S.,Seoul National University | Yoon E.S.,Automation and Systems Research Institute
Korean Journal of Chemical Engineering | Year: 2012

This paper presents the results of the cost of energy (COE) analysis of an integrated gasification combined cycle (IGCC) power plant with respect to CO 2 capture ratio under the climate change scenarios. To obtain process data for a COE analysis, simulation models of IGCC power plants and an IGCC with carbon capture and sequestration (CCS) power plant, developed by the United States Department of Energy (DOE) and National Energy Technology Laboratory (NETL), have been adopted and simulated using Aspen Plus. The concept of 20-year levelized cost of energy (LCOE), and the climate change scenarios suggested by International Energy Agency (IEA) are also adopted to compare the COE of IGCC power plants with respect to CO 2 capture ratio more realistically. Since previous studies did not consider fuel price and CO 2 price changes, the reliability of previous results of LCOE is not good enough to be accepted for an economic comparison of IGCC power plants with respect to CO 2 capture ratio. In this study, LCOEs which consider price changes of fuel and CO 2 with respect to the climate change scenarios are proposed in order to increase the reliability of an economic comparison. And the results of proposed LCOEs of an IGCC without CCS power plant and IGCC with CCS (30%, 50%, 70% and 90% capture-mole basis- of CO 2 in syngas stream) power plants are presented. © 2012 Korean Institute of Chemical Engineers, Seoul, Korea. Source


Lee W.,Seoul National University | Yoo Y.M.,Seoul National University | Lee S.M.,Seoul National University | Park C.G.,Seoul National University | Park C.G.,Automation and Systems Research Institute
AIAA Guidance, Navigation, and Control Conference 2012 | Year: 2012

TRN (Terrain Referenced Navigation) is based on the comparison of terrain height measurements with a digital elevation map. The comparison can be carried out either based on MAD (minimum absolute differences) or MSD (minimum square differences). Batch processed TRN can be used to provide horizontal position fixes. However, over flat terrain and water, TRN cannot fix the position of the vehicle, because the candidate profiles which have a MAD value similar to the minimum will appear in the data correlation process. To overcome this drawback, we propose two enhancements. First, a decision is made for whether or not to use batched-processed TRN, depending on the degree of the terrain roughness. Second, the statistics of MAD are used to prevent false fixes due to similar terrain in the area of interest. Simulation results show improvement in the navigation performance of the updated data correlation method. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Source


Dan S.,Seoul National University | Dan S.,Automation and Systems Research Institute | Kim J.,Seoul National University | Kim J.,Automation and Systems Research Institute | And 6 more authors.
Journal of Chemical Engineering of Japan | Year: 2015

According to the recent trend for the integrated safety management of chemical plants as part of plant life cycle engineering, it is recommended that a safety integrity level (SIL) analysis be performed to simultaneously meet the operational efficiency and safety specifications of a process. In this paper, a unified framework is proposed for adapting life cycle engineering to risk assessment, including reusing the results, recommending a risk reduction by using a hazard and operability (HAZOP) support tool as a hazard identification method, and determining the SIL from a layer of protection analysis combined with fuzzy logic. First, a HAZOP support system is used to select scenarios with reducing efforts when the HAZOP study is implemented. Second, a fuzzy layer of protection analysis (fLOPA) is conducted to adjust the mo\st reliable independent protection layer (IPL) by solving the objective uncertainty, which includes the failure rate data, probability of failure on demand, and subjective uncertainty. The required SIL for each scenario is determined, and a safety instrumented system is recommended to fit the demanded SIL. This framework, which is validated for a hydroxylamine case study, makes it possible to determine the required SIL with less effort and considers the uncertainties in the process, especially for plants that handle reactive and hazardous chemicals. © 2015 The Society of Chemical Engineers, Japan. Source

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