KWS Manufacturing

Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR

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Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR - KWS

Columbia Pacific Bio-Refinery is Located on the Columbia River

General Description of the Application

The Columbia Pacific Bio-Refinery operates a fuel-grade ethanol production facility near Clatskanie, Oregon. Dried Distillers Grains (DDG) are a byproduct of the ethanol production process and a great, low cost alternative ingredient for animal feed. In the ethanol making process, distillers grains are produced in large quantities and are rich in the protein, fat, minerals and vitamins that animals need. The high nutrient content makes distiller grains an excellent replacement for more expensive corn, soybean meal and di-calcium phosphate ingredients.

Screw conveyors are used throughout the ethanol processing industry for conveying bulk materials such as corn and DDG. Columbia Pacific Bio-Refinery needed a very special screw conveyor for loading shipping containers. The screw conveyor would be unsupported on one end and project into shipping containers. As a shipping container was filled with DDG, it would be moved and the container would be evenly and fully filled with DDG. Columbia Pacific Bio-Refinery contacted KWS because of past experience with special-designed screw conveyors for difficult applications. KWS designed a cantilevered screw conveyor that exceeded the expectations of customer.

Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR - KWS

Shipping Containers are Backed into Position to be Filled with DDG

Design Parameters of Application

  1. Product Type: Dried Distillers Grains
  2. Material Density: 52 Lbs. per Cubic Foot
  3. Conveyor Capacity: 187,980 Lbs per Hour
  4. Duty: 24 Hours per Day, 7 Days per Week

Advantages Provided by KWS

KWS has designed and manufactured cantilevered screw conveyors for many different industries. The engineers at KWS have a wealth of knowledge and experience and specialize in designing bulk material handling equipment for demanding applications. The cantilevered section of the screw conveyor for Columbia Pacific Bio-Refinery extended almost 20-feet in order to project inside the shipping containers. KWS verified the design of the cantilevered screw conveyor with Finite Element Analysis (FEA) and improved the design in high stress areas.

Special Features of KWS Design

The sides of the screw conveyor were re-enforced with 8-inch structural channels on both sides of the tubular housing to support the 20-foot long cantilevered section and minimize deflection and sway. The screw conveyor was designed to load 50,000 lbs. of DDG in less than 15 minutes. The new screw conveyor was driven from the inlet end with a 30-horsepower drive unit. KWS selected the drive unit to handle any worst-case upset condition.

CEMA standard screws were selected to minimize cost and for easy access to spare parts. Replacement screws are stocked at a local power transmission distributor. The last screw section extends 2-feet past the end of the trough assembly. The DDG discharges out the end of the screw conveyor and evenly fills the farthest corners of the shipping containers.

Testimonial

"The KWS cantilevered screw conveyor has been working great for over 4 years now! The design is simple and robust. We have saved thousands of hours by loading the containers with the screw conveyor. Thanks for the excellent design and high-quality equipment."

Dennis Bahneman, Project Manager – Columbia Pacific Bio-Refinery

Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR - KWS

Cantilevered Screw Conveyor Discharges and Distributes DDG in Shipping Container

Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR - KWS

CEMA Standard Screws are Supported by Hangers Located in Hanger Pockets

Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR - KWS

8-Inch Structural Channel Adds Stiffness to Cantilevered Screw Conveyor

Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR - KWS

30-HP Drive Unit is Located on Inlet End

Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR - KWS

Last Screw Section Extends 2-Feet Past End of Trough

Special Cantilevered Screw Conveyor for Columbia Pacific Bio-Refinery in Clatskanie, OR - KWS

Overall View of Screw Conveyor

Dried Distillers Grain (DDG)

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