Stepped fluidized bed gas distribution plate

Abstract

The invention provides a novel gas distribution plate suitable for a fluidized bed reactor of a strong corrosion and strong exothermic reaction system. The distribution plate comprises a circular central area, a circular main body area and a circular wall surface area which rise in a stepped manner from inside to outside, and reducing short pipe type gas distribution holes which are uniformly distributed in each area; and each reducing short pipe type gas distribution hole comprises a bottom contraction section, a middle straight section and an upper expansion section. The ratios of the bottominlet diameters to the throat diameters of the bottom contraction sections of the distribution holes in the three areas are continuously increased from the central area to the wall area, and the gasflow rate in the corresponding ventilation area is continuously reduced, so the wall surface area is in a moving bed state, and the central area and the main body area are in a fluidized state, thereby the heat transfer and mass transfer efficiency of the fluidized bed is improved, catalyst active component loss caused by local overheating is avoided, and reactor corrosion caused by wall surface abrasion and local fluidization dead zones of the fluidized bed can be reduced.

Description

technical field [0001] The invention belongs to the field of chemical synthesis devices, in particular to a novel fluidized bed reactor gas distribution plate. Background technique [0002] Fluidized bed technology is widely used in chemical industry, metallurgy, medicine and other industries. In many application fields of fluidized beds, highly corrosive and exothermic reaction systems are involved, such as hydrogen chloride oxidation reaction, ethylene oxychlorination reaction, pulverized coal fluidized bed gasification reaction, etc. In order to achieve long-term stable operation of such highly corrosive and exothermic fluidized bed reactors, the following countermeasures must be taken: [0003] (1) Prevent the occurrence of dead zones in the fluidized bed from reducing the efficiency of heat transfer and mass transfer; [0004] (2) Prevent local overheating of the fluidized bed from consolidating catalyst particles or losing active components; [0005] (3) Prevent the...

AI Technical Summary

Problems solved by technology

However, the above-mentioned invention has low operating flexibility. In order to make the large-particle materials start to fluidize, the gas velocity in the entire ventilation area can only be increased. The solid particles with low particle density or small particle size have a large momentum, which will make the side wall area of ​​the fluidized bed Severe abrasion of internal components such as hood and hood

[0010] Therefore, it is necessary to develop a gas distribution plate that can not only overcome the low heat transfer and mass transfer efficiency caused by non-uniform materials in the fluidized bed, but also avoid the serious abrasion problem caused by excessive gas velocity, and also has high operating flexibility. becomes very important

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