A Question of (Particle) Character...

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DÜPERTHAL Sicherheitstechnik GmbH & Co. KG

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A few years ago, the general consensus was that bulk solids are unpredictable, but in the meantime this attitude has changed. With the increased computing power available today, simulation using techniques such as finite element analysis is an effective process optimization tool.

The advantage of methodologies like CFD (computational fluid dynamics) based simulation is that a good model enables engineering teams to safely investigate many process details and parameters. Simulation provides important information about local conditions in many different parts of the equipment. Filling operations in a silo at high and low load levels or flow conditions in a mixer can be optimized using the model. The list of parameters can include the location of the filling point, the size of the filter, the bulk solids involved and their temperature. Good solutions can also be developed for complex geometries and mounting configurations. This can reduce test and development costs.

Particle analysis also provides a detailed understanding of the process. Visualization has enormous advantages. What takes place at the interfaces and how that affects the process are now understood. As a result, properties such as the size, crystal morphology and shape of the particles can be controlled with greater precision. This is important for the development of personalized medicine where the active ingredients are tailored to the individual patient.

Understanding of bulk solids behavior increases equipment service life

In bulk solids handling, the objective is often to maintain the material flow. The choice of the right gate, a change in the direction of flow from horizontal to vertical and detailed silo design keep the bulk solids moving. A lot can be accomplished by modification of the particle size distribution or the formation of agglomerate or micro-granulate. This includes the removal of fines, changing the comminution process or coating the surface with very fine-grained flow promoters.

A proper understanding of the product prevents early wear on the equipment. Wear normally depends more on system design than on the bulk solids. Design changes may not eliminate wear but they can reduce the deterioration rate. Changing the angle or speed of impact can increase equipment service life over the long term.

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