Particle bed supporting structure and axial-radial catalytic reactor

Abstract

The invention discloses a particle bed supporting structure and an axial-radial catalytic reactor. The particle bed supporting structure comprises a supporting grating (1) and a compaction grating (2) arranged along a vertical direction at an interval, wherein the supporting grating is located below the compaction grating, a particle bed (3) is arranged between the supporting grating and the compaction grating, the supporting grating and the compaction grating are coaxially arranged and are two frustum cylinders becoming increasingly narrower upwards, and the particle bed is one selected from a group consisting of a catalyst bed, a drying agent bed and an adsorbent bed. The axial-radial catalytic reactor is provided with the particle bed supporting structure. With such a scheme, an inlet circulation area of the particle bed is increased, so the flow velocity of gas is reduced, scouring of inlet particles is mitigated, and the inlet particles are prevented from efflorescence; and after reduction in the inlet flow velocity of the bed, particles with lower strength and a smaller particle size can be used, so the utilization rate of particles is increased, pressure drop of the bed is decreased, and energy is saved.

Description

technical field [0001] The invention relates to the field of petroleum and chemical equipment, in particular to a particle bed support structure and an axial radial catalytic reactor with the support structure. Background technique [0002] For the catalyst bed support structure of the reactor, it is generally divided into two types, namely, a planar support grid and a cylindrical support grid. These two support structures correspond to axial fixed bed reactors and radial reactors, respectively. Planar grilles and cylindrical grilles have their own scope of application, and each has its own advantages and disadvantages. [0003] 1) The planar grid support structure of the catalyst bed, such as figure 1 As shown, it is generally used in axial fixed bed reactors. The catalyst bed of this type of reactor is arranged in a horizontal cake shape, the fluid flows through the bed from top to bottom along the axial direction, and the bed has no heat exchange with the outside world...

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Problems solved by technology

But this kind of reactor also has some disadvantages: the bed of the catalyst bed is generally thicker, and the resistance of the reactants to flow through the bed is large. In order to reduce the resistance, a large particle catalyst must be used; because of its large pressure drop, it has a certain impact on the strength of the catalyst. Higher requirements, preventing catalyst particles from being pulverized by the impact of high-speed airflow

In this way, the convex surface of the inner cylinder and the fan-shaped cylinder will bear the pressure from the catalyst, that is, the external pressure. Under the action of the external pressure, the stability and rigidity of the inner cylinder and the fan-shaped cylinder are required to be higher, which is likely to cause instability.

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