Hydrodynamics of Downer Reactor with a New Inlet Structure
Hydrodynamics of Downer Reactor with a New Inlet Structure
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发表时间：
2006
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通讯作者：
Wang Xie-qing
中科院分区：
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作者：
Wang Xie-qing
设计了一种新型的降油反应器入口结构，增加了进料油的雾化空间，增强了油雾的分布，提高了油/催化剂的接触效率。该入口结构可提供合适的催化剂浓度，保证油媒有效接触，提高反应速率。进料油以逆流和横流的方式与催化剂接触，增强了油与催化剂之间的传热传质。研究发现，在降料器入口段，固体浓度径向分布呈抛物线形。在向下流动的过程中，固体浓度逐渐向壁面扩散，直至形成完全发育的流段。在充分发展的流动段，下降器壁面附近的固体浓度高于中心区域。
A new type of inlet structure of downer reactor was contrived, which included the atomization space of feed oil that enhanced distribution of oil spray to improve oil/catalyst contact efficiency. This inlet structure could provide suitable catalyst concentration to ensure effective oil/catalyst contact and enhance reaction rate. Feed oil contacted catalyst by countercurrent and cross-flow, which would enhance heat and mass transfer between oil and catalyst. It is found that at the inlet section of the downer, solids concentration radial profile is parabolic. As it flows downwards, solids concentration gradually diffuses towards the wall until fully-developed flow section forms. At fully-developed flow section, solids concentration is higher near the wall than that at the center area in the downer.