Screw Conveyor Distributes Fly Ash for Standley Batch Systems

General Description

Fly ash is a fine powder that is a byproduct of burning pulverized coal in electric power generation plants. It is composed of the mineral residue that is left when coal is burned, and it is collected from the plant’s exhaust gases. On its own, fly ash doesn’t have any real benefits. In the past, fly ash was released into the atmosphere, creating a negative effect on air quality. Regulations were put in place to control emissions and the disposal of fly ash. It’s now collected and stored at coal power plants to be used in various applications.

Fly ash is primarily known for improving the strength, durability and workability of concrete mixes and is commonly used as a structural fill for road construction. Fly ash is also used to make bricks, ceramic tiles, plaster, Portland cement and ready-mix concrete. It can also be used in other applications such as a filler in paints, adhesives, and metal and plastic composites.

Design Parameters

1. Product Type: Fly Ash
2. Material Density: 65 Lbs. per Cubic Foot
3. Max Capacity: 2,308 Cubic Feet per Hour
4. Duty: 24 hours a day, 7 days a week

KWS Advantages

Standley Batch Systems provides equipment and solutions for the concrete building products industry. KWS and Standley Batch Systems have a long term, successful relationship and have completed many projects together. KWS understands the applications and ensures our equipment is designed properly to be incorporated into the overall system and to avoid any interference with the corresponding equipment. Standley Batch Systems provided equipment layouts so KWS engineers could input their 3D models to verify proper equipment integration.

KWS Special Features

The new KWS screw conveyor was designed with a center inlet so fly ash could be conveyed in either direction. With five total discharge points, the three middle discharges were equipped with pneumatically operated slide gates for distribution of material to various stages of the process.

Fly ash is extremely abrasive, so KWS lined the screw conveyor troughs with abrasion-resistant AR235 liners to improve performance and increase equipment longevity. With an average Brinell Hardness (BHN) of 235, AR235 is a hardened steel that is 98% harder than A36 carbon steel. The liners are easily removed and replaced when needed. To add to equipment longevity and eliminate contamination or damage to the drive and tail bearing, the new KWS screw conveyor utilized a bulkhead trough end on the drive end and pedestal trough end on the tail end separate the drive unit and tail end bearing away from the trough end and potential contamination.

The new KWS screw conveyor was equipped with a Whirligig Zero Speed Switch. The zero-speed switch warns of equipment malfunction through detection of zero speed and provides a signal that is used in upstream control panels to shut down machinery in case of a sudden jam or failure. The process may be halted to prevent damage or plugging of other conveying or processing equipment.