Xfh® Ultra

Next generation software for rating and simulating fired heaters

Xfh Ultra, HTRI’s general-purpose fired heater modeling software, provides improved calculations for refinery operations. Users can easily explore operating scenarios to increase capacity and performance, helping to minimize energy loss and shutdown time.

Xfh Ultra is flexible enough to handle most fired heater configurations. In each firebox, heat transfer is simulated using a single-zone model. This reliable and practical approach is combined with an integrated convection section calculation with allowance for shock radiation from the firebox.

The graphical interface makes it easy for users to quickly set up and run fired heater cases. During testing, users rated it easiest to operate when compared to other fired heater software. It features an interactive fired heater diagram, which simplifies the setup of complex stream and coil connections.

Xfh Ultra tubeside calculations are based on HTRI’s methods for calculating heat transfer and pressure drop in process fluids, as used by Xchanger Suite®. These methods are backed by HTRI’s extensive research on single-phase and two-phase boiling. In addition, the program uses well-established single-zone methods for simulating the firebox and a 3D incremental approach to modeling flue gas temperatures in the convection section.

Version 2.0 offers new capabilities, including

  • multiple dissimilar fireboxes and flue gas mixers
    Handles multiple dissimilar fireboxes in a single simulation that share a common convection section (e.g., inter-stage heating in catalytic reformers). In addition, the introduction of a flue gas mixer unit operation allows for more complex flue gas arrangements such as multiple fired heaters sharing a common stack, supplementary heating, and air ingress.
  • interactive fired heater flowsheet
    Provides a new, flow-sheet style, interactive fired heater diagram for defining more complex fired heater configurations.
  • firebox and radiant coil diagrams
    Includes 3D diagrams of the firebox and associated radiant coils, along with the ability to zoom and rotate.
  • arbor coils
    A specific arbor (also known as U tube, wicket, or basket) coil type is now available to users.
  • convection section improvements
    Provides a more comprehensive definition of convection bank geometries, including the presence and size of corbels and duct dimensions.
  • external piping and connections
    Includes unheated process lines, which can have a significant impact on the pressure drop, in the overall fired heater simulation. These can be connections between heater sections or external piping to adjacent unit operations.
  • steam injection
    Specifies the inclusion of any number of steam injection points into the tubeside process fluid, which is an important consideration in vacuum heaters.
  • liquid fuels with steam atomization
    Defines atomization steam as part of a liquid fuel definition.
  • flow regime parameters
    Reports parameters to determine position in HTRI and Baker flow regime maps at each solution point.

Contact us at htri@htri.net for more information about Xfh Ultra.

Xfh Ultra multiple firebox arrangement
Multiple firebox arrangement (typical of catalytic reformers) set up using the Xfh Ultra interactive configuration diagram.