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Grinding with Ball Mill S

Mill Ventilation

stems

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HGRS Tikaria_Mill

Heating & Cooling -

Mill Ventilati

Water

Injection

Heating

Cooling

2

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ossibilities

n

in Separator

Cement

Coolers

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Heating and Cooling

Mill Ventilation

Water Injection

Heating

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Units

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Mill Ventilation - Obj

Avoid the consequenctemperatures inside th

Material coating on b

performance loss of 5

Cement false setting

Lump formation in the

4

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ctives

es of too high grindinge mill (115 130 [C]):

lls and liners resulting in a

10 [%]

gypsum dehydration

silos

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HGRS Tikaria_Mill

Mill Ventilation - Gui

Mill fresh air

Optimum mill ventilation is acompromise between :

Material level in the first ch

Mill outlet temperature

Filter dew point ((T >25 3

Product fineness at the filte

Filter dimensioned for 1.5 [

airspeed above the ball cha

5

SEPT-07orkshop

elinesFalse air

Fan

False air

m

ber

[C])

r

False air reduces the cooling

capacity of the mill tube

/s]

rge

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HGRS Tikaria_Mill

Additional ventilation

Mill fresh air

Water

Clinker

Separator fresh air

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SEPT-07orkshop

cooling possibilities

False air

Cooler

False air

Fan

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HGRS Tikaria_Mill

Separator fresh air

Separator fresh air

A single pass separator witthe cement at the mill outlet

The mill tube is cooled dowseparator rejects

A cyclone air separator onlycement (5 10 [C])

7

SEPT-07orkshop

0.7 [m3/kg cement] can cool down30 40 [C].

through the lower temperature

achieves marginal cooling of the

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HGRS Tikaria_Mill

Heating and Cooling

Mill Ventilation

Water Injection

Heating

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orkshop

- Units

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HGRS Tikaria_Mill

Water injection - Gui

Water

1 [m3/h] water = 15000 30

Water acts like a grinding ai

Water increases the air dewmaintain air temperature 25

Not more than 1.0 1.5 [%]

9

SEPT-07

orkshop

elines

000 [m3/h] air in heat dissipation

d (mill capacity increase)

point (watch out starts & stops) mustto 30oC higher than dew point in filter

ater injection on total mill feed basis

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HGRS Tikaria_Mill

Water injection - Sys

Water in 1st chamber only ifthe ball charge

If water is required in boththe 2nd chamber, starting in

10

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orkshop

ems

mill feed > 100 [C] and oriented towards

hambers: 1/3 in the 1st chamber & 2/3 in2nd

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Water injection - Dev

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orkshop

ices

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Standard Installation

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Water injection Co

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orkshop

trol scheme

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Heating and Cooling

Mill Ventilation

Water Injection

Heating

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orkshop

- Units

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HGRS Tikaria_Mill

9

2 4[

[t/h] dry

Fresh feed moisture

Clinker temperatureproportion

15

SEPT-

7

orkshop

9

2 4] H2O in fresh feed

nd mill performance

Hot gas generatormaximum capacity

&

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HGRS Tikaria_Mill

Dying wet componen

+/ - +

-

-

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orkshop

ts without hot gas

+

/ -

> 90 - 95 [C]

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HGRS Tikaria_Mill

Drying wet compone

+/ - +/

+

-

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orkshop

ts with hot gas

+

-

> 90 - 95 [C]

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HGRS Tikaria_Mill

Hot gas

Wa

ste

= Fan gas

Hot gas

Water steam

False air

+

False air

Drying wet compone

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orkshop

False air

False air

Fan gas

er

m

ts with hot gas

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HGRS Tikaria_Mill

Hot gas generator

Fuel type Nozzle adapted to the

operating range

Control

Hot gas generator type

(start/stop sequences)

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orkshop

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HGRS Tikaria_Mill

Drying wet compone

Parameters to play with in Gas flow path Material trajectory Material retention time

20

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orkshop

ts in a drying chamber

a drying chamber: