Weba Chute Systems MD Mark Baller explains that a systems approach to bulk solids handling design is essential to ensure operational characteristics are matched throughout the plant. By custom designing each transfer point, individual Weba Chute Systems can be configured to suit each particular application.
“Our system uses a ‘supertube’, with a cascade scenario, where 95% of the material runs on material at the same time in a tumbling motion, rather than gliding down the chute. We have found that gliding particles cause extensive wear, while the tumbling or rolling motion causes far less wear.
“We have taken this a step further by designing the internal angle of the transfer chute to match the product with the belt speed and in so doing product degradation is greatly reduced or completely eliminated,” he adds.
The Weba Chute System uses a streamlined scientific approach to the dynamics of bulk materials handling taking all aspects such as belt speed, belt width, material size, shape and throughput into account. The custom design allows control of the direction, flow and velocity of a calculated volume and type of material in each individual application and at the same time drastically reduces dust.
“In essence, it is the absolute control of material while being transferred that will eliminate degradation. This requires an in-depth understanding of how material needs to be transferred and factors in changes of direction, the impact during these changes of direction and height of transfer,” says Baller.
The geometry of the system should be such that material is moved through the chute system with gradual directional changes and controlled velocity in order to minimise impacts that leads to material degradation and dust generation.
In addition, discharge onto the conveyor system must be correctly controlled and be as close to the belt speed as possible.
Controlling the transfer of material onto the conveyor belt guarantees increased cost savings for clients in addition to an improved health and safety performance.
“Global best practice in Weba Chute Systems emphasises the incorporation of transfer chutes that have been designed and engineered to suit the specific application, with optimised plant design considering each element within the process flow,” Baller concludes.
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