Three-phase boiling bed reactor

Abstract

The invention discloses a three-phase boiling bed reactor, which comprises a reactor casing and a three-phase separator, wherein the three-phase separator is positioned at the upper part in the reactor casing and comprises two homocentric round tubes with different inner diameters: an inner tube and an outer tube, the upper ends and the lower ends of the inner tube and the outer tube are all open, and the inner tube and the outer tube respectively comprise a straight tube section and a diffusion section. The three-phase boiling bed reactor is characterized in that the diameter of the straight tube section of the inner tube of the three-phase separator is 0.6 to 0.9 time of the diameter of the reactor casing. Through analyzing the speed distribution rule of liquid in the boiling bed reactor in the radial direction positions, the structure of the three-phase separator is reasonably set, so the operation elasticity of the three-phase separator is increased, and the efficient separation of the three-phase separator is ensured. The reactor is mainly applicable to the chemical reaction taken by different kinds of liquid and gas substances under the condition of being contacted with solid particles, and the reactor has the advantages that the catalyst inventory is large, the utilization rate of the reactor is high, the structure is simple, the operation is easy, and the like.

Description

Technical field [0001] The invention relates to a new type of three-phase fluidized bed reactor, in particular to an improved three-phase fluidized bed hydrogenation reactor used for chemical reactions when different kinds of liquid and gaseous substances are in contact with solid particles in parallel flow . Background technique [0002] The fluidized bed reactor is a gas, liquid, and solid three-phase fluidized bed, which can process heavy and inferior feedstock oils with high metal and high asphaltene content. It has small pressure drop, uniform temperature distribution, and can maintain constant catalyst activity throughout the operation cycle , It can add fresh catalyst and remove waste catalyst during operation. [0003] A typical fluidized bed process is described in US Re 25,770, but this process method has the following shortcomings in practical applications: the catalyst storage in the reactor is small, the reactor space utilization rate is low; the maintenance cost of t...

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Problems solved by technology

[0003] A typical fluidized bed process is described in US Re 25,770, but this process method has the following disadvantages in practical application: the amount of catalyst storage in the reactor is small, and the space utilization rate of the reactor is low; the maintenance cost of the circulating oil pump is high, and once Malfunction and damage of the circulating oil pump will cause the catalyst to sink and accumulate, resulting in the forced shutdown of the device; the liquid product in the reactor stays for too long under non-catalytic hydrogenation conditions, and it is easy to undergo secondary thermal cracking reaction at high temperature Coking reduces product quality

The three-phase separator introduced in this patent has a small operating flexibility at the outlet of the three-phase separator and the outlet of the reactor. The catalyst separated by the three-phase separator will stick to the outlet of the catalyst, and the phenomenon of cross-gas is likely to occur at the outlet of the catalyst, which affects the The separation effect of the three-phase separator, and the catalyst brought out is easy to block the downstream device, which is not conducive to the long-term operation of the device

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