External Modular Grids for Radial Bed Reactors

Abstract

The radial bed reactor comprises an external cylindrical grid (3) and a coaxial internal cylindrical grid (2) defining an annular space containing a catalyst bed. The external grid of diameter (D) is a Johnson type grid divided into equal modules. Each module has a parallelepiped shape of an arc with a height (H) of 1 / 15 to 1 / 3 times the height of the reactor, and a side corresponding to an angular sector of angle (alpha ) of 20-60[deg] and having a length of D / 2x alpha . The side of the module is equipped with inwardly returning edges of the reactor, and is perpendicular to a plane of the module. The radial bed reactor comprises an external cylindrical grid (3) and a coaxial internal cylindrical grid (2) defining an annular space containing a catalyst bed. The external grid of diameter (D) is a Johnson type grid divided into equal modules. Each module has a parallelepiped shape of an arc with a height (H) of 1 / 15 to 1 / 3 times the height of the reactor, and a side corresponding to an angular sector of angle (alpha ) of 20-60[deg] and having a length of D / 2x alpha . The side of the module is equipped with inwardly returning edges of the reactor, and is perpendicular to a plane of the module. The modules constituting the external grid are divided into several rows from top to bottom of 1-N and two successive rows denoted as I and 1+1, and are arranged in staggered rows. A connection between two adjacent modules is carried out by bolting, a key system and point welding. Horizontal and vertical edges of the module have a thickness of 1-5 cm. The horizontal edges of the module are downwardly inclined by an angle (delta ) of 0-45[deg] .

Description

technical field [0001] The present invention relates to the field of radial bed refining units in which a catalytic bed is defined between a peripheral wall portion and an internal peripheral wall portion and feed flows through the bed in a crosswise manner relative to the catalyst flow. [0002] More precisely, in this type of radial bed unit, the catalytic bed has an annular shape in which it extends from the outer edge of the surrounding wall to the inner edge of said surrounding wall, thus delimiting the Central collector for waste water. The feed is generally introduced at the outer edge of the annular bed and passed through the catalytic bed substantially perpendicular to the latter's vertical flow direction. The reaction wastewater is collected in a central collector. [0003] The present invention is concerned with the mechanical aspects of radial flow reactors, and more precisely, the aim of the present invention is to increase the mechanical resistance of the perip...

AI Technical Summary

Problems solved by technology

[0015] The problem associated with the technology in the gas phase of catalytic radial bed reactors is that, regardless of the operating conditions (in normal operation, in case of cooling or heating, or in case of an emergency shutdown), the catalyst is essentially confined to the external and within the annular area defined by the internal grille, which can cause significant uneven expansion due to varying heat levels in the unit

Images