한국수소및신에너지학회논문집 (Transactions of the Korean hydrogen and new energy society)

  • 제30권2호
  • /
  • Pages.111-118
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  • 2019
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  • 1738-7264(pISSN)
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  • 2288-7407(eISSN)
한국수소및신에너지학회 (The Korean Hydrogen and New Energy Society)
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코크스오븐가스 기반 천연가스, 바이오가스가 혼합된 연료의 가압 수증기 개질 반응에 관한 연구

Study on the Pressurized Steam Reforming of Natural Gas and Biogas Mixed Cokes Oven Gas

  • 전형준 (한국과학기술원(KAIST) 기계공학과) ;
  • 한광우 (한국과학기술원(KAIST) 기계공학과) ;
  • 배중면 (한국과학기술원(KAIST) 기계공학과)
  • 투고 : 2019.03.06
  • 심사 : 2019.04.30
  • 발행 : 2019.04.30
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초록

Greenhouse gas emissions have a profound effect on global warming. Various environmental regulations have been introduced to reduce the emissions. The largest amount of greenhouse gases, including carbon dioxide, is produced in the steel industry. To decrease carbon dioxide emission, hydrogen-based iron oxide reduction, which can replace carbon-based reduction has received a great attention. Iron production generates various by-product gases, such as cokes oven gas (COG), blast furnace gas (BFG), and Linz-Donawitz gas (LDG). In particular, COG, due to its high concentrations of hydrogen and methane, can be reformed to become a major source of hydrogen for reducing iron oxide. Nevertheless, continuous COG cannot be supplied under actual operation condition of steel industry. To solve this problem, this study proposed to use two alternative COG-based fuel mixtures; one with natural gas and the other with biogas. Reforming study on two types of mixed gas were carried out to evaluate catalyst performance under a variety of operating conditions. In addition, methane conversion and product composition were investigated both theoretically and experimentally.

키워드

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Fig. 1. P&ID of COG reforming

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Fig. 3. Thermodynamic composition and methane conversion of mixed fuel at 850℃, 20 bar, and SCR 3.0

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Fig. 4. Effect of pressure and GHSV on the experimental methane conversion of r-COG reforming

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Fig. 5. Effect of GHSV on product composition of r-COG reforming at (a) atmospheric pressure, (b) 10 bar, (c) 20 bar

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Fig. 2. Thermodynamic composition and methane conversion of r-COG at 850℃, SCR 3.0 and pressure (a) atmospheric pressure, (b) 20 bar

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Fig. 6. Effect of feed gas on the product composition at 20 bar, GHSV 20,000 h-1

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Fig. 7. Effect of feed gas on thermodynamic and experimental methane conversion at 20 bar and GHSV 20,000 h-1

Table 1. Concentration of mixed feed gas (mol%)

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Table 2. Operating condition of experiment

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