提升管加床层反应器不同操作模式下的压力脉动特性

在提升管加床层反应器冷模实验装置上，分别采取零床层和有床层的操作模式，测量并分析了提升管内的压力脉动行为. 结果表明，有床层操作模式下的提升管内压力脉动标准偏差明显高于零床层操作模式；压力脉动主频零床层操作模式下主要集中于1.56?3.13和0?0.391 Hz，主要源于提升管内颗粒的脉动，有床层操作模式下为12.5?25.0和0?0.391 Hz，12.5?25.0 Hz频段主要源于提升管出口上方设置的气固分布器加流化床层对提升管内气固流动的约束及其影响下的气体脉动行为，0?0.391 Hz频段主要源于提升管段进料的不连续性及其与进料口下方提升气体的相互作用.

Pressure Fluctuation Characteristics of Riser-Fluidized Bed Reactor under Different Operating Modes

Based on a cold model experiment setup of a coupled reactor mainly composed of lower riser and upper fluidized bed, an experiment was measured and analyzed the pressure fluctuation in the riser under the work mode of operating bed existing and not existing. Experimental result and analysis show that the standard deviation of pressure fluctuation in the riser is obviously higher when the operating bed exist. The frequency of pressure fluctuation mainly around 1.56?3.13 and 0?0.391 Hz when the operating bed not exist, and around 12.5?25.0 and 0?0.391 Hz when the operating bed exist. The 1.56?3.13 Hz mainly result from the fluctuation of particles in the riser, while the 12.5?25.0 Hz result from the gas?solid distributor locating at the exit of the riser, the restriction of gas?solid flow caused by upper fluidized bed and the gas fluctuation this restriction resulting in. The 0?0.391 Hz mainly result from the discontinuous feedstock of riser and the interaction it caused with the underneath lifting gas.