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On the Two-Phase Theory of Group C+ and Geldart Group A Particles
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-06-15 , DOI: 10.1021/acs.iecr.0c02077 Yandaizi Zhou 1 , Jesse Zhu 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-06-15 , DOI: 10.1021/acs.iecr.0c02077 Yandaizi Zhou 1 , Jesse Zhu 1
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The relative distribution of gas flow between the bubble phase and dense phase is a very important factor that determines the performance of a gas–solid fluidized bed reactor because the dense phase provides a better gas–solid contact than the bubble phase. The gas flow through the dense phase was initially considered to be at minimum fluidization (the so-called two-phase theory) but was found to be higher with fine Group A particles. Using even smaller particles in this study, the fluidization of Group C+ particles, Geldart Group C particles with nano-additives, exhibited lower bubble rise velocity, lower bubble holdup, and higher gas holdup in the dense phase, etc., signifying more gas flow through the dense phase and subsequently contributing to better gas–solid contact than other particles that have ever been tested, being Group A or B. The correction factor Y that accounts for increased dense-phase gas flow in the modified two-phase theory was also found to be not a constant but a function of the superficial gas velocity, and a correlation was then proposed to characterize the division of gas flow between the two phases for these fine Group C+ particles based on the experimental results. The higher dense-phase gas velocity and lower bubble-phase gas velocity could improve the gas–solid contact and reactor performance for Group C+ particles.
中文翻译：
关于C +组和Geldart A组粒子的两相理论
气泡相和密相之间气流的相对分布是决定气固流化床反应器性能的一个非常重要的因素，因为密相比气泡相提供了更好的气固接触。最初认为流过致密相的气流处于最小流化状态（所谓的两相理论），但发现在A组细颗粒中较高。在这项研究中使用甚至更小的颗粒，C +组的流化颗粒，具有纳米添加剂的Geldart C组颗粒，在致密相中表现出较低的气泡上升速度，较低的气泡滞留率和较高的气体滞留率等，表明更多的气体流过致密相，从而有助于更好的气固接触与修正过的两相理论中考虑到致密相气流增加的校正因子Y并不是常数，而是表面气体的函数。速度，然后提出相关性以表征这些细C +组的两相之间的气流分配基于实验结果的颗粒。较高的密相气体速度和较低的气泡相气体速度可以改善C +粒子的气固接触和反应器性能。
更新日期：2020-07-08
中文翻译：
关于C +组和Geldart A组粒子的两相理论
气泡相和密相之间气流的相对分布是决定气固流化床反应器性能的一个非常重要的因素，因为密相比气泡相提供了更好的气固接触。最初认为流过致密相的气流处于最小流化状态（所谓的两相理论），但发现在A组细颗粒中较高。在这项研究中使用甚至更小的颗粒，C +组的流化颗粒，具有纳米添加剂的Geldart C组颗粒，在致密相中表现出较低的气泡上升速度，较低的气泡滞留率和较高的气体滞留率等，表明更多的气体流过致密相，从而有助于更好的气固接触与修正过的两相理论中考虑到致密相气流增加的校正因子Y并不是常数，而是表面气体的函数。速度，然后提出相关性以表征这些细C +组的两相之间的气流分配基于实验结果的颗粒。较高的密相气体速度和较低的气泡相气体速度可以改善C +粒子的气固接触和反应器性能。
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