关键词: 沸腾床, 加氢反应器, 气液分布器, 进气段, 泡罩, 影响区域, 固体颗粒分布

Abstract: A gas-liquid distributor structure for ebullated bed hydrogenation reactor is proposed. The relationship between the geometric structure and performance of the gas-liquid distributor is analyzed in detail by CFD numerical simulation. The simulation results show that the inclined hole structure in the inlet section is mainly gas phase channel, and the vertical inflow of gas will hinder the upward flow of liquid, thus increasing the pressure drop of the distributor; the perforated plate structure of bubble cap will lead to the aggregation and growth of bubbles, and the vertical impact of fluid on the installed baffle will also cause energy loss; due to the structural characteristics of the inclined tube of the bubble cap, the purging area of the distributor is similar to the geometric structure, which is easy to produce catalyst deposition. According to the simulation results, cancel the inclined hole at the inlet section and the porous distribution plate at the outlet in the original structure, open a slits at the lower end of the bubble cap, change the opening at the inclined pipe into slits , and adjust the relative position of orifice plate and slits in the center pipe to form an improved structure. The simulation results show that the improved structure has lower pressure drop, larger influence area and better comprehensive performance than the original structure.    

Key words: ebullated bed, hydrogenation reactor, gas-liquid distributor, inlet section, bubble cap, influence area, distribution of solid particle