(5) According to the matrix theory of
comminution, which involves the concepts of the classification matrix and
breakage matrix, the mathematical models of roll crushers and rotary breakers
of coal preparation plants have been investigated in this paper. For the roll
crusher model, the classification matrix is expressed by a certain equation.
The breakage matrix is developed firstly by a single particle pendulum breakage
test, and then by a computing calculation for the test data using a
multidimensional cubic spline regression technique. The rotary breakage
involves three subprocesses: prescreening, crushing and, rescreening. The
prescreening and rescreening subprocesses are represented by a simple
efficiency curve model. Modelling the crushing subprocess uses the same concept
as the roll crusher model, but needs more assumptions. The feed of the rotary
breaker is considered to be divided into two components( "coal" and
"ash"). These two components have the same classification function
but different breakage function. They are also selected for breakage at
different rates. The crushing and rescreening subprocesses repeat for several
stages. The above two models have been tested using a number of industrial
experimental data. It has been found that they can be used to predict the size
distribution of crushing products with reasonable accuracy. In addition, an
empirical model has been developed to predict the ash content of the broken
coal fractions.
(6)Based on working mechanism and
working performance research of compressive crusher, the multi-objective
planning of crusher productivity, product grain size distribution and chamber
geometry was built up, which provided the basis for developing new style and
high efficiency modern compressive crusher. Combined with multi-objective
planning of cone crusher, the solving methodology of multi-objective planning
of compressive crusher was deeply studied, and the serial quadratic programming
based on K-T equation was adopted to solve this multi-objective problem.
(7)Based on compressive crusher working
performance models and multi-planning model, the cone crusher optimization
system was developed. This system could optimize and analyze the working
performance and design parameters of cone crusher. Through the related physical prototype full
scale test further verified the feasibility and reliability of working
performance models and multi-objective models. Based on working mechanism and
working performance research, the parameters’ optimization system was developed
and successfully applied in the related crusher manufacturer. This optimization
system has got many compliments for its good effect.
(8)The future research works, including
research aims, contents, and methods, are put forward to outlook。
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