Development of feed forward control system of fluidized bed reactor to overcome the fatal possibility for defludization

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420819
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Reaction engineering/Process system
• Research Institution: Kagoshima University
• Principal Investigator: Kai Takami 鹿児島大学, 理工学域工学系, 教授 (00177312)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 流動層 / 反応装置 / 非流動化 / 自動制御 / モル数減少 / 体積減少

Outline of Final Research Achievements

When the reaction involving gas volume reduction is performed in a fluidized catalyst bed, serious defluidization occurs. The reason is that the gas velocity in the emulsion phase becomes lower than the minimum fluidization velocity. The conditions that will cause defluidization (the defluidization region) could be detected by the on-line analysis of the average value, the standard deviation, the dominant frequency and the periodicity of fluctuations. In this study, hydrogenation of carbon dioxide was performed in a fluidized catalyst bed and the operation parameters were controlled to maintain good fluidization. When the values of indexes exceeded threshold values, the reaction conditions were changed to move from the defluidization region by decreasing the reaction temperature or stop the carbon dioxide supply. By controlling the reaction conditions, the frequency of occurrence of defluidization could be suppressed and the intensity of the defluidization could be reduced.

Free Research Field

化学工学