Breakage Of Components Research Articles

A multi-component model for the vertical spindle mill

Vertical spindle mills (VSMs) are widely utilised in coal power plants that account for more than 40% of the electrical energy generated worldwide. These mills can consume up to 1% of the gross power generated by the plant; and hence, present a good scope for optimisation. However, optimisation requires better understanding of the operation of these mills and reliable models to be used for investigating optimisation opportunities.A new model of VSMs has been developed which enabled interlinked simulation of comminution and classification operations that occur in the mill. The multi-component models incorporate the effects of size and ash distribution in coal feed, air and coal flow rate and power drawn by the mill. Both models utilise the size-by-size density distribution of the coal streams. An efficiency curve model based on settling velocity was used to describe and distinguish difference in behaviour due to variable density of the components and their composites in the three classification regions. The matrix comminution model works with a selection function that is only dependent on size and a three dimensional breakage function that is size, density and energy dependent to account for the differences in breakage of components and composite particles.It has been demonstrated that, the particle size distributions and flow rates corresponding to the streams in the mill and its product can be estimated with a very good accuracy. A reasonable prediction is also found for the density distributions in these streams.

Nondimensional simulation of influence of toughness of interface on tensile stress–strain behavior of unidirectional microcomposite

Abstract For description of the stress–strain curve, variation of Young's modulus with increasing applied strain and fracture morphology of composite, a nondimensional shear lag method combined with a Monte Carlo simulation procedure was proposed, in which the statistics of the occurrence of damages such as breakage of components (fiber and matrix) and debonding of interface, mechanical interactions among the damaged and undamaged portions and variation of the geometry of location of the damages with increasing applied strain, are incorporated. The proposed method was applied to microcomposite with different interfacial toughness, and variations of the order and location of occurrence of damages, stress–strain curve and fracture morphology with varying interfacial toughness were shown.