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RISS 인기검색어
- 검색키워드
- 발행기관 : The Institution ; distributed by Pergamon (검색결과 3 건)
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Choi, G.B.,Lee, S.G.,Lee, J.M. The Institution ; distributed by Pergamon 2016 Chemical engineering research & design Vol.114 No.-
This paper presents a mathematical framework for planning an energy supply system. The proposed model takes into account important factors affecting the total cost of supplying commercial energy such as market prices and waste disposal costs. Forecasting models are employed to predict future prices and demand levels. Given the renewable energy portfolio standard that promotes energy generation from renewable sources, a large-scale nonlinear planning problem is decomposed into a mixed integer linear program and a nonlinear program for traditional and renewable energy sectors, respectively. Nonlinearity arises from the learning curve that describes cost changes through future advances in technologies for exploiting renewable energy sources. The suggested approach can provide insights for crafting long-term policies, which can then be revised with updated information. The modeling framework is illustrated using public data from South Korea, interpreted in light of country's policies. Results based on various scenarios indicate that uncertainty and the cost of waste disposal facilities significantly affect the optimal policy choice.
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Harvianto, G.R.,Ahmad, F.,Lee, M. The Institution ; distributed by Pergamon 2017 Chemical engineering research & design Vol.124 No.-
This paper presents a novel hybrid process combining thermally coupled reactive distillation with membrane-based pervaporation for enhanced production of n-butyl acetate. A conventional reactive distillation process was used as the base case and first optimized for the transesterification of methyl acetate with n-butanol to produce n-butyl acetate. It was observed that methyl acetate recovered in the recycle stream significantly affects the conversion in the reactive distillation column and overall energy efficiency of the whole process. The existing and proposed configurations were evaluated and optimized by simulation in Aspen Plus. The integration of thermally coupled reactive distillation and pervaporation improved the energy efficiency of the reactive distillation process by preventing remixing effect in the reactive distillation column and eliminating the azeotropic nature of the methanol and methyl acetate in the recycle stream, respectively. Finally, integration of the thermally coupled reactive distillation with a commercial pervaporation membrane was explored to take synergistic advantage of the thermally coupled reactive distillation and pervaporation hybrid configuration. As a result, the proposed hybrid design showed remarkably improved energy efficiency and economics. The total reboiler duty and total annual cost reduced to 63 and 43%, respectively, compared to those of the base case.
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Lee, S.G.,Choi, G.B.,Lee, C.J.,Lee, J.M. The Institution ; distributed by Pergamon 2017 Chemical engineering research & design Vol.124 No.-
Low-temperature liquid CO<SUB>2</SUB> could boil off during ship transportation because of the heat ingress from the surroundings to inside the tank, which causes the tank pressure to increase. To maintain the operating pressure range of the tank, the re-liquefaction process is indispensable. Three design alternatives to the re-liquefaction process using boil-off CO<SUB>2</SUB> as a refrigerant are proposed and compared. A systematic procedure to find the optimal design of CO<SUB>2</SUB> re-liquefaction is provided considering operational constraints such as the cooling water temperature and compressor discharge temperature. The optimal operating conditions of the proposed processes are determined by solving nonlinear programming. The compressor power consumption as the operation energy for the CO<SUB>2</SUB> re-liquefaction ranges from 60 to 120kW/t CO<SUB>2</SUB> given the operational constraints. As the seawater temperature is lower and the discharge temperature limit is higher, the proposed Alternative 2 design consumes less power than the other designs.
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