• Title/Summary/Keyword: Mechanical

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Effect of oxygen distribution for hot spot and carbon deposition minimization in a methane autothermal reforming reactor

  • Lee, Shin-Ku;Bae, Joong-Myeon;Kim, Yong-Min;Park, Joong-Uen;Lim, Sung-Kwang
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.1996-2000
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    • 2008

  • In autothermal reforming reaction, oxygen to carbon ratio (OCR) and steam to carbon ratio (SCR) are significant factors, which control temperature and carbon deposition into the reactor. The OCR is more sensitive than the SCR to affect the temperature distribution and reforming efficiency. In conventional operation, hydrocarbon fuel, steam, and oxygen was homogeneously mixed and injected into the reactor in order to get hydrogen-rich gas. The temperature was abruptly raised due to fast oxidation reaction in the former part of the reactor. Deactivation of packed catalysts can be accelerated there. In the present study, therefore, the effect of the oxygen distribution is introduced and investigated to suppress the carbon deposition and to maintain the reactor in the mild operating temperature (e.g., $700{\sim}800^{\circ}C$). In order to investigate the effect numerically, the following models are adopted; heterogeneous reaction model and two-medium model for heat balance.

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A Delphi Study on Competencies of Mechanical Engineer and Education in the era of the Fourth Industrial Revolution (4차 산업혁명 시대 기계공학 분야 엔지니어에게 필요한 역량과 교육에 관한 델파이 연구)

  • Kang, So Yeon;Cho, Hyung Hee
    • Journal of Engineering Education Research
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    • v.23 no.3
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    • pp.49-58
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    • 2020

  • In the era of the fourth industrial revolution, the world is undergoing rapid social change. The purpose of this study is to predict the expected changes and necessary competencies and desired curriculum and teaching methods in the field of mechanical engineering in the near future. The research method was a Delphi study. It was conducted three times with 20 mechanical engineering experts. The results of the study are as follows: In the field of mechanical engineering, it will be increased the situational awareness by the use of measurement sensors, development of computer applications, flexibility and optimization by user's needs and mechanical equipment, and demand for robots equipped with AI. The mechanical engineer's career perspectives will be positive, but if it is stable, it will be a crisis. Therefore active response is needed. The competencies required in the field of mechanical engineering include collaborative skills, complex problem solving skills, self-directed learning skills, problem finding skills, creativity, communication skills, convergent thinking skills, and system engineering skills. The undergraduate curriculum to achieve above competencies includes four major dynamics, basic science, programming coding education, convergence education, data processing education, and cyber physical system education. Preferred mechanical engineering teaching methods include project-based learning, hands-on education, problem-based learning, team-based collaborative learning, experiment-based education, and software-assisted education. The mechanical engineering community and the government should be concerned about the education for mechanical engineers with the necessary competencies in the era of the 4th Industrial Revolution, which will make global competitiveness in the mechanical engineering fields.

  • https://doi.org/10.18108/jeer.2020.23.3.49 인용 PDF KSCI