SCEO_L7 - Selected Chemical Engineering Operations Selected...

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Selected Chemical Engineering Operations Selected Chemical Engineering Operations LECTURE - 7
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Selected Chemical Engineering Operations Properties and Handling of Particulate Solids • Size reduction • Principles of comminution • Characteristics of communicated products • Energy and power requirements – Rittinger’s Law – Kick’s Law – Bond’s Law
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Selected Chemical Engineering Operations Principles of Comminution • Comminution is a generic term for size reduction – crushers and grinders are types of comminuting equipment • An ideal crusher or grinder would – have a large capacity – require a small power input per unit of product – yield a product of the single size or the size distribution desired • The usual method of studying the performance of process equipment is to – set up an ideal operation as a standard – compare the characteristics of the actual equipment with those of the ideal unit – account for the difference between the two
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Selected Chemical Engineering Operations Characteristics of Comminuted Products • The objective of crushing and grinding is to produce small particles from larger ones • Smaller particles are desired because of – their large surface – their shape, size and number • One measure of the efficiency of the operation is based on the energy required to create new surface – the surface area of a unit mass of particles increases greatly as the particle size is reduced • Unlike an ideal crusher or grinder, an actual unit does not yield a uniform product – whether the feed is uniformly sized or not
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Selected Chemical Engineering Operations Characteristics of Comminuted Products • The product always consists of a mixture of particles – ranging from a definite maximum size to very small particles • The ratio of the diameters of the largest and smallest particles in a comminuted product is of the order of 10
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SCEO_L7 - Selected Chemical Engineering Operations Selected...

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