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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Gas leakage between reactors in a dual fluidized bed system
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Gas leakage between reactors in a dual fluidized bed system

机译：双流化床系统中反应器之间的气体泄漏

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摘要

The leakage of gas between two interconnected gas-solid fluidized beds is investigated for 48 operating conditions in a lab-scale dual fluidized bed (DFB) consisting of a riser and a bubbling fluidized bed (BFB). Helium is used as the tracer gas with a spent FCC catalyst bed in ambient conditions. Gas leakage occurs from the riser to the BFB via the downcomer; and from the BFB to the riser via the loop-seal. Gas leakage from the riser to the BFB varied between 0.1 and 0.6%, translating to 1 and 7% of the BFB being contaminated with riser gas. This leakage is dependent on pressure difference across the downcomer and the solids circulation flux. Leakage in the downcomer is proposed to be caused by the riser gas being dragged down by the falling particles in the upper section of the downcomer.
机译：在一个实验室规模的双流化床（DFB）中，研究了两个相互连接的气固流化床之间的气体泄漏情况，该实验室流化床由立管和鼓泡流化床（BFB）组成。在环境条件下，氦气用作FCC催化剂床用过的示踪气体。气体从立管经降液管泄漏到BFB。并从BFB经由环封到立管。从立管到BFB的气体泄漏在0.1％和0.6％之间变化，这意味着BFB的1％和7％被立管气体污染。这种泄漏取决于降液管两端的压差和固体循环通量。下降管中的泄漏被认为是由于上升管气体被下降管上部中的下落颗粒向下拖拽引起的。

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