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FRNC Simulation

FRNC-5 simulates the performance and predicts the efficiency of most fired heaters and water tube boilers as found in refineries, petrochemical plants, and cogeneration schemes. Most parts of the heater can be simulated, including:

• Complex processes
• Multiple fireboxes
• Convection sections
• Ducts
• Stacks
• Most coil configurations
• Most tube and fin types
• Transfer lines
• Manifolds
• Fittings


The process and other critical conditions can be determined at any point—entering, leaving or within the unit—for up to ten streams and the flue gas. Using proven, yet innovative methods, the program both simulates process flow and predicts heat transfers and pressure drops. The program's rigorous stepwise approach follows the process and flue gas streams as they pass through each coil and furnace section, accurately determining the following heater items:

• Firebox and overall heater efficiency
• Bridge wall and stack entry flue gas temperatures
• Local radiant and convective heat flux (peak and average)
• Peak and average tube metal and fin tip temperatures throughout firebox, shock and heat recovery coils
• Determination of two-phase flow and boiling regimes
• Heat transfer and pressure drop in two-phase flow
• Fireside draft and heat transfer
• Presence of "choke" flow, "dry-out" conditions, or "cold-end" corrosion potential


Designed to help demystify fired heaters, the program is an invaluable, time-saving tool for engineers in process, design and operating departments. A large variety of different heater systems may be simulated, including:

• Crude and Vacuum Heaters
• Multifirebox type of Reformers, Platformers, Rheniformers, and Powerformers
• Fired Reboilers and Superheaters
• CO-Fired Process Heaters and Boilers
• Desulfurizer Preheaters
• Coking and Visbreaking Furnaces
• Waste Heat Recovery and Steam Generators


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