Follow us on Call us for support at 952-935-2345. After hours messages are monitored 24/7.


Coping With Vacuum – The Importance of Ejector Systems in Urea Plants

The following article was recently published by Jim Lines and appeared in the June 2017 issue of World Fertilizer magazine.

Ejector systems are critical to the final concentration of a urea solution. Regardless of the end product, whether produced by granulation or prilling, ejector systems establish evaporator pressures that permit the removal of water to concentrate the urea solution at temperatures sufficiently low enough to minimize biuret formaton.

There are several process technologies for urea production. Saipem/Snamprogetti, Maire Tecnimont/Stamicarbon, Toyo Engineering Corp., Casale and NIIK offer the most frequently used. For each process technology, the ejector systems are critical to plant throughput and product quality. While critical to the success and profitability of a urea plant, ejector systems are viewed as not generally well understood. The thermodynamics of ejector performance in not widely known and the vacuum condensers within an ejector system cannot be designed with conventional heat exchanger software.

This article provides a deeper review of ejectors and vacuum condensers in urea concentration processes so that specifiers, evaluators, purchasers and users of this critical process equipment understand the salient considerations necessary to provide reliable plant performance. Download the complete article that covers:

  • Ejector systems for urea concentration processes
  • Steam supply conditions
  • Ejector performance curve
  • Variables that affect ejector performance
  • Booster ejector flushing
  • Vacuum condensers
  • Ammonia emission from ejector system
  • Numerous charts and equations

Click to download the complete article “Coping With Vacuum” by Jim Lines, Graham Corp.

<< Go Back
Subscribe to our CS Update Newsletter: Send Me The Latest News

952-935-2345  address15350 Minnetonka Blvd., Minnetonka, MN 55345

Products We Carry

  • Hot Water Boilers
  • Watertube Steam Boilers
  • Firetube Steam Boilers
  • Deaerators
  • Heat Recovery Steam Generators (HRSG’s)
  • Automatic Recirculation Valves
  • Economizers
  • Gas-Fired Water Heaters
  • Gas-Fired Humidifiers
  • Boiler/Generator Flue Stacks
  • Continuous Emissions Monitors (CEMS)
  • Pressure Reducing Valves
  • Safety and Relief Valves
  • Control Valves
  • Pressure Independent Control Valves
  • Expansion Joints, Guides, Anchors
  • Flash Tanks
  • Flow Meters
  • Balancing Valves
  • Check Valves
  • Separators
  • Pumps
  • Pressure Booster Systems
  • Piston Valves
  • Heating/Cooling Coils
  • Plate and Frame Heat Exchangers
  • Shell and Tube Exchangers
  • Water Heaters
  • Steam Humidifiers
  • Vacuum Systems
  • Condensers
  • Steam Traps
  • Wireless Steam Trap Monitors
  • Tube Bundles
  • Direct Gas-Fired Space Heaters
  • Direct Gas-Fired Make-Up Air Units
  • Unit Heaters
  • Strainers
  • Air Vents
  • Liquid Drainers
  • Heat Transfer Packages
  • Digital Water Mixing Valves
  • Air Cooled Condensers/Dry Coolers
  • Steam Filters
  • Electric Condensate Pumps
  • Steam/Air-Powered Condensate Pumps
  • Packaged Condensate Pump Skids