• Title/Summary/Keyword: Waste fuel

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Optimal Design of RSOFC System Coupled with Waste Steam Using Ejector for Fuel Recirculation (연료 재순환 이젝터를 이용한 연료전지-폐기물 기반 가역 고체 산화물 연료전지의 최적 설계)

  • GIAP, VAN-TIEN;LEE, YOUNG DUK;KIM, YOUNG SANG;QUACH, THAI QUYEN;AHN, KOOK YOUNG
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.4
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    • pp.303-311
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    • 2019

  • Reversible solid oxide fuel cell (RSOFC) has become a prospective device for energy storage and hydrogen production. Many studies have been conducted around the world focusing on system efficiency improvement and realization. The system should have not only high efficiency but also a certain level of simplicity for stable operation. External waste steam utilization was proved to remarkably increase the efficiency at solid oxide electrolysis system. In this study, RSOFC system coupled with waste steam was proposed and optimized in term of simplicity and efficiency. Ejector for fuel recirculation is selected due to its simple design and high stability. Three system configurations using ejector for fuel recirculation were investigated for performance of design condition. In parametric study, the system efficiencies at different current density were analyzed. The system configurations were simulated using validated lumped model in EBSILON(R) program. The system components, balance of plants, were designed to work in both electrolysis and fuel cell modes, and their off-design characteristics were taken into account. The base case calculation shows that, the system with suction pump results in slightly lower efficiency but stack can be operated more stable with same inlet pressure of fuel and air electrode.

  • https://doi.org/10.7316/KHNES.2019.30.4.303 인용 PDF KSCI

Manrfacturing Process of Solid Fuel Using Food Wastes and Paper Sludges (음식물 쓰레기와 제지슬러지를 이용한 고체연료 제조)

  • Kim, Yong-Ryul;Son, Min-Il
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.4
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    • pp.437-444
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    • 2010

  • Dry Process(natural drying, hot-air drying, oil fry drying), optimized mixture ratio and the condition of carbonization was carried out in order to improve the product durability develop eco-friendly solid fuel mixing food waste and paper sludge. As a result of the experiment, oil fry drying process was the fastest method for drying food waste and paper sludge mixture that contains 80% water inside, and the optimized mixture ratio to minimize the generating concentration of chlorine gas against caloric value of mixture ratio was 7:3. Additionally proper temperature of product carbonization was about $200^{\circ}C$ and shown increasing product durability through the carbonization. Therefore, the pelletized solid fuel be shaped diameter around 0.5cm, length 2cm under which was pulverized and molded using 7:3 mixture of food waste, and paper sludge was the eco-friendly solid fuel possible to be industrialized which is consist of chlorine concentration of below 2.0wt% and the lowest caloric value of over 5,000kcal/kg. In conclusion, this developing manufacturing process of the solid fuel can be interpreted to contribute alternative energy development in accordance with low carbon and green growth era.

  • https://doi.org/10.12925/jkocs.2010.27.4.7 인용 PDF KSCI

Conversion of organic residue from solid-state anaerobic digestion of livestock waste to produce the solid fuel through hydrothermal carbonization

  • Yang, Seung Kyu;Kim, Daegi;Han, Seong Kuk;Kim, Ho;Park, Seyong
    • Environmental Engineering Research
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    • v.23 no.4
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    • pp.456-461
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    • 2018

  • The solid-state anaerobic digestion (SS-AD) has promoted the development and application for biogas production from biomass which operate a high solid content feedstock, as higher than 15% of total solids. However, the digested byproduct of SS-AD can be used as a fertilizer or as solid fuel, but it has serious problems: high moisture content and poor dewaterability. The organic residue from SS-AD has to be improved to address these problems and to make it a useful alternative energy source. Hydrothermal carbonization was investigated for conversion of the organic residue from the SS-AD of livestock waste to solid fuels. The effects of hydrothermal carbonization were evaluated by varying the reaction temperatures within the range of $180-240^{\circ}C$. Hydrothermal carbonization increased the calorific value through the reduction of the hydrogen and oxygen contents of the solid fuel, in addition to its drying performance. Therefore, after the hydrothermal carbonization, the H/C and O/C atomic ratios decreased through the chemical conversion. Thermogravimatric analysis provided the changed combustion characteristics due to the improvement of the fuel properties. As a result, the hydrothermal carbonization process can be said to be an advantageous technology in terms of improving the properties of organic waste as a solid-recovered fuel product.

  • https://doi.org/10.4491/eer.2018.055 인용 PDF KSCI