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Feed diffuser distributes the incoming flow from inlet nozzle of the reactor. In downflow reactors, the inlet nozzle is also used as a hatch for installing the internals and catalyst in the reactor. Feed diffuser can be attached either to this flange or may be sitting in a groove between flanges. Depending on flow dynamics in the reactor top head and technological process, feed diffuser is made of plates, grates and perforated sheet metal. Impingement plate of diffuser faces the incoming flow, which can be diverted through several channels, which sizes depend on incoming pipe diameter and the nozzle height.

In upflow reactors, feed diffuser sits above the inlet nozzle. If requested by a customer, the equipment can be made removable to simplify cleaning.

Necessary design parameters

  • Working and design pressure and temperature
  • Flow parameters
  • Physical characteristics of the working environment
  • Geometric dimensions of the reactor and inlet fitting

Design features

  • Rigid welded construction, securely installed in the inlet fitting
  • Easy installation and maintenance
  • Uniform flow distribution due to optimal perforation and striker plate arrangement


  • Hydrotreating
  • Hydrocracking
  • Reforming
  • Isomerization
  • Adsorption


Pictures: 1-3 – feed distributor; 4 – feed distributor installation (between flanges or welding).