Center Pipe Inside Reactor

Center pipe, inner screen

The center pipe, also known as the inner screen, is a critical element in radial flow reactors. Its general shape is a cylinder, where the outer surface delimits the inner side of the catalyst bed. It is usually installed inside vertical reactors and collects or distributes the flow. 

This center pipe is a central slotted screen in radial flow reactors. Its outer surface contacts the catalyst layer and is made as a slit screen of triangular wire. This device holds the packing and directs the flow towards the outlet. There are versions for flow going towards the center or outwards the center. The central pipe is installed in the reactor on support elements above the outlet fitting. The flow area of the outer surface of the pipe is calculated to ensure operation within the wide range of flow rates.

Scallops

The scallops assembly forms the outer screen component of a radial flow system. Its general shape extends parallel to the inner vessel wall using the wall as support. The inner surface delimits the outer side of the catalyst bed. Its purpose is to distribute and collect the flow.

Outer baskets

The outer baskets are the outer screen components of a radial flow system. Their general shape extends parallel to the inner vessel wall. The surface of the baskets delimits the outer side of the catalyst bed and its purpose is to distribute or collect the flow.

Application

Platforming

Reforming

Ammonia synthesis

Necessary Design Parameters

Working and design pressure and temperature

Flow parameters

Physical characteristics of the working environment

Pressure drop

Catalyst and packing parameters

Dimensions of the reactor, it’s bottom, outlet fitting and top hatch

Design features

The dismountable structure allows mounting through the reactor hatch

Large screen area, minimal hydraulic resistance

The usage of a slit screen stops catalyst leakage and excludes clogging of slots due to the usage of triangular wire

Strict control of verticality and straightness tolerances

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