CHAPT-04.PDF

 Mill Material Balance

CHAPTER I V

BASIC APPROACH OF MILLING

After we know technically the composition of sugar cane as the raw material for the milling, 4)

then it is now come to the basic approach of milling and its mass flow from a mill unit  outlined  below: cane

bagasse

mixed juice The formula of continuity: input = output #

At the input portion, for mill 1 is cane, or bagasse for the following mill units. Let

:

Wim = the weight, weight, and

Vim = the volume (no-void) At the output portion, there are  juice (extracted) and bagasse . Say

:

For the bagasse:

Wej = the weight of extracted juice Vej = the volume of extracted juice W b = the weight, and V b

Hence

:

Furthermore, if:

Wim = Wej + Wb ...............………………………........….. ...............………………………........…............. ........... (1)

d im = cane / bagasse density density (no-void) (no-void) at the input input portion portion dej

then and

4)

= the volume (no-void);

= density of extracted juice, and

:

d b = density of bagasse (no-void) at the output portion Wim = d im x Vim

:

Wej = dej x Vej W b = d b x V b

Toät Soemohandojo, Soemohandojo, Extraction of of a Mill, Gula Indonesia Indonesia Magazine, Volume Volume VI No.4 - 1980

 Basic Approach of Miling  

IV-1

 Mill Material Balance

Because cane / bagasse   at the input portion is considered to consist of  juice  and fiber as mentioned in Chapter II, and if: Wij = the weight of juice contain in cane / bagasse Vij = the volume of juice contain in cane cane / bagasse and

: Wf  = the weight of fiber Vf  = the volume of fiber (no-void);

then

:

............…..…………………………..….................. .. (2) Wim = Wij + Wf  ............…..…………………………..…................

Furthermore, if: dij = density of juice containing the input portion, and df then

= density of fiber (no-void) (no-void)

: Wij = dij x Vij : Wf = df  x Vf 

and

The identical condition applies to the output portion, that bagasse   is considered to consist of  juice and fiber (see Chapter II), then if:

W bj = weight of juice in bagasse V bj = volume of juice in bagasse Wf  = weight of fiber, and Vf = volume of fiber (no-void), as mentioned mentioned above, And so

:

Wb = Wbj + W f  .................….…..................………………………….. .................….…..................………………………….. (3)

It is understood that the weight of fiber (W f ) at the input portion as well as at the output portion {see equation (2) and equation (3)}, both have the same value (without loss). The same parameter also applied to its no-void volume of fiber (V f ). ). Then it is also understood throughout the tandem in every mill, that the weight and the no-void volume of fiber each have the same respective value.

 Basic Approach of Miling  

IV-2