Combined-type gas distributor and fluidized bed reactor

Abstract

The invention belongs to the technical field of chemical engineering, and particularly discloses a combined-type gas distributor and a fluidized bed reactor. The combined-type gas distributor comprises a first gas distributor body and a second gas distributor body. The first gas distributor body comprises a gas distribution header pipe, gas distribution branch pipes and nozzles, wherein the gas distribution header pipe, the gas distribution branch pipes and the nozzles are basically arranged in the same plane; the gas distribution branch pipes are connected to the gas distribution header pipe,and the nozzles are uniformly arranged on the gas distribution header pipe and the gas distribution branch pipes. The second gas distributor body comprises lower-layer perforated plates and upper-layer perforated plates which are arranged from bottom to top in sequence, each layer of perforated plate is provided with staggered holes, and the second gas distributor body is arranged above the firstgas distributor body. According to the combined-type gas distributor and the fluidized bed reactor, through the arrangement of the first gas distributor body and the second gas distributor body, thegas is uniformly distributed, clogging of the nozzles is also avoided, and the utilization efficiency of a catalyst is obviously improved. The fluidized bed reactor comprises the combined-type gas distributor, and can be widely applied to the gas-solid catalysis reactions in the field of chemical engineering.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a combined gas distributor and a fluidized bed reactor. Background technique [0002] In chemical production, reactors used for gas-solid catalytic reactions usually include fixed-bed reactors and fluidized-bed reactors. Fluidized bed reactors are generally selected for reactions with strong heat of reaction (strong endothermic or exothermic) or reactions in which the catalyst requires continuous regeneration. [0003] At present, there are two types of gas distributors at the bottom of the commonly used fluidized bed reactor: bubble cap type and nozzle type. [0004] The advantages of the bubble-cap gas distributor are uniform gas distribution and high catalyst utilization efficiency. Its disadvantages are poor operation stability and difficult maintenance; at the same time, because the blister distribution plate is a flat plate, the flat plate has poor pressure resi...

AI Technical Summary

Problems solved by technology

[0007] (1) Uneven gas distribution

[0008] Due to the nozzle structure of the existing nozzle-type gas distributor, its arrangement effect cannot achieve the effect of regular triangle arrangement or concentric circle arrangement, and it is easy to cause uneven gas distribution

[0009] (2) The nozzle is easy to block

[0010] Because the nozzle of the existing nozzle-type gas distributor is facing downward, when the reactor stops fluidization, the catalyst in the dense-phase area will fall back in a large amount instantly, and will be poured back into the nozzle pipe, gas distribution branch pipe, gas distribution main pipe, and even the gas inlet pipe. and form a serious blockage

[0011] (3) The fluidization of the reactor is difficult

[0012] The existing nozzle-type gas distributor is easy to block because the nozzle is easy to be blocked. When the reactor is fluidized, the gas is easy to drift, which makes the reactor fluidization difficult.

During the fluidization process of the reactor, it is easy to cause a large amount of catalyst to be carried out, resulting in production accidents

[0013] (4) Catalyst utilization efficiency is low

[0016] Therefore, there is an urgent need to develop a device that can effectively solve the problems of the existing gas distributors such as uneven gas distribution, easy clogging of nozzles, difficulty in reactor fluidization, and low catalyst utilization efficiency.

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