Concave flow distribution plate and reactor with same

Abstract

The application relates to a concave flow distribution plate and a reactor with the same. The concave flow distribution plate is formed by modifying a flat flow distribution plate and comprises a concave structure that is concave down along its axis and a bent structure bent down from the periphery of the concave flow distribution plate; the concave structure is conical structure, spherical structure or composed of symmetrical concave double-curved surface; the flow distribution plate helps process gas from the bottom of the reactor to flow out of flow holes so that material from the upper portion of the reactor and process gas rising from below can be balanced and fully contacted, thus keeping a relative pressure, the distribution plate has flow balancing performance, particulate mobility and internal structure fatigue resistance and is simple in combination structure and convenient to mount and maintain, a support of the distribution plate is more reasonably stressed, high stability is provided, spatial layout is safer and more scientific, the reactor is better in operation flexibility, reaction heat can be removed more flexibility, safety of a shell wall is protected, and the service life of the reactor is prolonged.

Description

technical field [0001] This application relates to the technical field of various large-scale high-grade reactors used in petroleum refining and chemical industry, coal chemical industry, chemical fertilizer industry and other various chemical equipment, such as fluidized bed gas phase reactor, hydrogenation through catalyst reaction A reactor or a desulfurization reactor, etc., especially relates to a concave air flow distribution plate and a reactor thereof. Background technique [0002] A chemical reactor, including a cylinder, a head arranged at both ends of the cylinder, a material inlet and outlet arranged on the head, an airflow distribution plate inside the cylinder and an inner support structure for supporting the airflow distribution plate, or a cylinder The supporting structure of the catalyst in the body also includes a surfacing corrosion-resistant lining on the inner surface of the pressure vessel. [0003] In recent years, with the development of petrochemica...

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Problems solved by technology

[0007] The distribution plate is a circular plate-shaped structure, and there are two main problems: one is that the production capacity is limited, and two kinds of through holes need to be designed on the same plate. The granular products on the top flow down smoothly through the through hole. With the increase of production capacity, the two channels of ascending and descending will be randomly blocked; second, the side of the circular plate bears less force than the shell and is easy to deform. The structure and airflow deviated from the original design

[0009] One is the three-dimensional non-equilibrium of the process gas fluidized bed. The process gas forms a spirally rising air flow in the funnel of the distribution plate. The energy loss of the swirling flow in the upward movement causes the circumferential flow state and the axial flow state to be unbalanced, so that from The material from top to bottom gradually generates particles during the reaction, and the coarse particles flow to the surrounding shell wall under the centrifugal action of the swirling flow, which easily causes the radial flow state to be unbalanced

Second, it is difficult to control the airflow pressure at the opening of the distribution plate. This is because the funnel-shaped inverted conical structure makes the space under the distribution plate gradually expand during the rising process, and the process gas under the distribution plate is rising. In the process, the total amount of process gas under the distribution plate is gradually reduced because part of it flows out from the radial opening, so that the air pressure is significantly reduced

The third is that the funnel of the distribution plate goes deep into the lower head to form an overlapping set relationship. The process gas coming in from the head strongly scours the bottom of the funnel due to space constraints, causing strong changes in the air flow pattern and vibration of the funnel, and the structure caused by vibration fatigue Loosening or cracking will generate some additional process gas channels, disturbing the original fluidized bed design, and entering a vicious cycle of structure and process

In addition, the original distribution plate also has some other problems that are not easy to install and adjust

[0010] The reason for the analysis of the above problems is that the structure design of the distribution plate mainly highlights the function of the funnel shape for collecting product particles, while ignoring its influence on the air flow, and ignoring the role of the process from the perspective of emphasizing the results

Some analysis pointed out that due to the influence of the side wall effect, the flow structure of the two-dimensional fluidized bed is quite different from that of the three-dimensional fluidized bed. The air vortex can only develop in the two-dimensional space, and the large-scale flat air vortex is more likely to appear in the bed.

Therefore, it is easy to form unstable fluidization conditions such as throttling in a two-dimensional bed, and it is impossible to form an overall circulation similar to a three-dimensional bed.

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