# 3.2 Influence of a plate of a food on efficiency of rectification

As it is specified by the first stage research of design data is. A correct choice of a plate of input of a food {FM) on design stages, or

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Its specification at a stage of the analysis of an actual mode can improve essentially quality of division of products without entering of additional power inputs.

In drawings 3.1, 3.2 graphs of dependence of criterion of relative thermodynamic dividing ability of a column (N) from number of a plate of a food (FM) are shown at various degree of extraction of the top product and at a different irrigation. Graphs illustrate following basic properties of dependence TV = f (FM).

1) dependence TV = f (FM) has extreme character and structure of this model in a general view can be described a polynom of the second degree:

N=A0+A, *FM+A2*FM2, (3.7)

Where Ao, And], А2 - the factors, which value depends on an irrigation and selection,

FM - number of a plate of a food. Concrete position of extremum N and factors Ao, Aj, А2зависит from results of parametrical identification (3.7) at irrigation and selection preset values (drawings 3.1, 3.2),

To each value of degree of extraction there corresponds an optimum place of input of a food at which relative thermodynamic dividing ability of a column reaches a maximum,

With increase in a deviation from a condition e = eopt influence of a place of input of a food on column work decreases.

It is important to notice, that the minimum of criterion Mi a maximum of criterion Л7 "is reached not always at the same value of number of a plate of a food, therefore at definition of a plate of a food for columns accurate and superfractionating it is necessary to use criterion./V. For the columns dividing continuous mixes and possessing small dividing ability, or the columns intended for doochi-stki of products, it is better to use M.Etot's criterion the important conclusion it is necessary to consider at a choice of criterion for optimisation of division of oil.

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Drawing 3.1 Column К-14. The graph of dependence of criterion of Maykov from plate number at various forced-circulations

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