VIPER Mill Technology

The new patented VIPER® Mill is a proven, reliable technology that significantly reduces operating cost and improves emissions control of dry sorbent injection (DSI) systems. VIPER Mill technology reduces sorbent particle size to enhance removal of SO2, SO3 and HCl.

The VIPER Mill is capable of processing up to 7 tons per hour of sorbent on a 24/7 basis. In a typical SO2 removal application, the VIPER Mill can reduce sorbent usage by 30-50%. In SO3 removal applications, the ultra small sorbent particle size helps to achieve aggressive ppm targets while reducing usage up to 50%. A single VIPER Mill can reduce sorbent costs by over $3 million annually compared to other DSI Systems.

Industry leading UCC DSI technology, including the new VIPER Mill, provides utilities with the most efficient and economical method to meet current and future emission limits and regulations.

To see a comparison of Milled Trona Injection Rate vs. Outlet SO3 Concentration click on image below

DSI Viper Chart

See our latest VIPER Mill press release on the Powder Bulk Solids website click here

VIPER Mill Animation
  • Greatest Sorbent Savings In the Industry
    • Smaller particle size leads to lower sorbent quantity consumed
      • 30-50% less sorbent used in SO2 application
      • 50% less sorbent used in a SO3 application
    • Fastest return on capital investment
    • Saves utilities millions of dollars over the life of the system

    SO3 cost comparison

  • Proven Performance
    • Patent-pending in-line automated cleaning system minimizes sorbent build-up
    • Design proven for 24/7 milling operation in a DSI application
    • Wear components are in stock and available for immediate shipment

  • Simple Installation and Integration into DSI Systems
    • Fully prepiped and prewired mill skids for quick installation
    • No secondary downstream sorbent storage required
    • Access to all moving parts for easy inspection
    • Configurable inlet and discharge to easily accommodate existing line sizes
    • The model 100VR is configured for 0.5 - 2 TPH and the model 150VR is for 2-7 TPH throughput

General Information:

Sorbent: Proven with Trona and Coarse Sodium Bicarbonate
Two Sizes Available
Capacity: 0.5 - 7 Tons Per Hour
Median Particle Size:

12-15 µm (Trona), 15-19 µm (Sodium Bacarbonate)

Pneumatic Conveying In-Line Milling Process
Filtered and Cooled Oil Lubrication System for Long Bearing Life
Easy Access for Preventative Maintenance and Life Cycle Rebuilds

  1. What sorbents will the VIPER Mill process?[+]
    The VIPER Mill is primarily used for trona or sodium bicarbonate and either sorbent can be used interchangeable without any changes to the mill, motor or cleaning system.
  2. What is the capacity of the different mill models?[+]
    The only difference between the different mill models is the motor size which is selected based on the maximum sorbent throughput necessary. The 100hp model can process up to 2 tons per hour; the 125hp model can process up to 4 tons per hour; and the 150hp model can process up to 7 tons per hour.
  3. How do you clean the mill?[+]

    The mill is cleaned most easily with the patent pending ,automated water cleaning system sold as part of the skidded mill system package. Both trona and sodium bicarbonate dissolve easily in water so very small volumes of water are used to completely clean the inside of the mill. The automated process does not require any operator input and goes through four primary steps:

    1.) Takes the system off line and diverts unmilled material wither around the mill or to a stand by mill system

    2.) Washes the mill and diverts the waste water to a sump for disposal

    3.) Dries the mill using heated air to expedite the drying process

    4.) Brings the system back on line and redirects the unmilled sorbent into the mill

  4. How does it compare to other mills on the market?[+]
    The VIPER Mill provides the smallest particle size and largest throughput capability of any single pass, mechanical mill on the market. This combination enables end users to get the most efficient sorbent usage while also providing the fewest pieces of equipment and conveying lines. Although air classifying mills provide finer particle sizes, the mills are incompatible with requirements utility applications because of the extremely high volume of conditioned air necessary to support the milling process.
  5. What particle size will it achieve?[+]
    The VIPER Mill will reduce typical unmilled trona to a median particle size (d50) of ≤15microns and industrial grade sodium bicarbonate (d50 of 150-180 microns) to a d50 of ≤20microns. Our testing shown that 5 micron difference in the d50 can equate to >20% difference in sorbent usage.
  6. What is the payback period?[+]

    Though this can vary based on each application, the payback period is typically less than one year.

  7. What are the benefits of using the VIPER Mill?[+]

    The three primary benefits of using the VIPER Mill are:

    1.) minimized sorbent consumption;

    2.) reduced system size; and

    3.) reliable automated cleaning system to support high availability requirements of environmental control systems

DSI System

United Conveyor Corporation leads the industry in performance-based turnkey solutions for dry sorbent injection at utility and industrial boilers. Dry Sorbent Injection is an economical and effective technology that injects selected sorbents into the flue gas to control SO2, SO3, mercury and acid gases.

DSI On-Site Demonstrations

DSI On-Site Demonstrations United Conveyor Corporation is the industry leader and the first to provide customer on-site demonstration.  UCC has over 25,000 hours of Dry Sorbent Injection (DSI) demonstration tests. Full-scale, on-site DSI demonstrations help utility customers address regulatory requirements for th