KWS Manufacturing

Paddle Screw Mixer for Petroleum Coke Blend

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Plant Name and Location

Conoco Phillips
Ponca City, OK

General Description

Conoco Phillips is a major producer of gasoline and petroleum based products. The Ponca City refinery is a high-conversion facility that produces a full range of products, including gasoline, diesel fuel, jet fuel, liquefied petroleum gas (LPG) and anode-grade petroleum coke. As part of their alternative fuel making process, Conoco Phillips needed to both convey and uniformly mix various control fed bulk solids. Materials were being fed from an existing hopper and secondary inlet through rotary valves. The blended product was ultimately discharged into a volumetric feeder leading to additional processing and packaging.

Design Parameters

  1. Product Type: Coke powder and Proprietary Additives
  2. Material Characteristics: Average flow, extremely abrasive, explosive
  3. Material Density: 35-40 Pounds per Cubic Foot
  4. Conveyor Capacity: 17.2 Cubic Feet per Hour
  5. Duty: 24 Hours per Day, 7 Days per Week

KWS Advantages

KWS engineers and design team reviewed the Customer’s process and offered a solution. Since the product feed rates were relatively low, KWS proposed a 6-inch diameter by 11-feet, 6-inch long paddle screw mixer with two inlets to receive, blend, and convey product at the desired capacity. With more than forty-five years of bulk material handling experience and the latest 3D modeling expertise, KWS provided Conoco Phillips with the exact piece of equipment necessary to accomplish the uniform mixing and conveying requirements of the process.

Special Features

The products being mixed and conveyed were both corrosive and abrasive. KWS chose to design and build the mixing conveyor out of 304 stainless steel and increase the material thickness of the trough and paddles to compensate for abrasion. The mixture can become very sticky so the paddles were continuously welded to the center pipe to avoid collecting and packing product around the paddle screw. Special purgeable shaft seals were used on both ends of the unit to keep the hazardous products contained in the mixing screw conveyor. The covers were designed to be removed for maintenance and cleaning but also provided a pressure-tight seal to the trough. KWS’ material handling expertise was an important factor in solving Conoco Phillips’ mixing and conveying problem.


"We did not have any problems with the KWS equipment after installation. Great job and thank you for making the project a success!"

Mark Southard, Engineering Vice President (Retired) – Conoco Phillips

KWS chose to design and build the mixing conveyor out of 304 stainless steel

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