Post on 30-May-2018
8/9/2019 06 Heating & Cooling
1/20
Grinding with Ball Mill S
Mill Ventilation
stems
8/9/2019 06 Heating & Cooling
2/20
HGRS Tikaria_Mill
Heating & Cooling -
Mill Ventilati
Water
Injection
Heating
Cooling
2
SEPT-07orkshop
ossibilities
n
in Separator
Cement
Coolers
8/9/2019 06 Heating & Cooling
3/20
HGRS Tikaria_Mill
Heating and Cooling
Mill Ventilation
Water Injection
Heating
3
SEPT-07orkshop
Units
8/9/2019 06 Heating & Cooling
4/20
HGRS Tikaria_Mill
Mill Ventilation - Obj
Avoid the consequenctemperatures inside th
Material coating on b
performance loss of 5
Cement false setting
Lump formation in the
4
SEPT-07orkshop
ctives
es of too high grindinge mill (115 130 [C]):
lls and liners resulting in a
10 [%]
gypsum dehydration
silos
8/9/2019 06 Heating & Cooling
5/20
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
8/9/2019 06 Heating & Cooling
6/20
HGRS Tikaria_Mill
Additional ventilation
Mill fresh air
Water
Clinker
Separator fresh air
6
SEPT-07orkshop
cooling possibilities
False air
Cooler
False air
Fan
8/9/2019 06 Heating & Cooling
7/20
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
8/9/2019 06 Heating & Cooling
8/20
HGRS Tikaria_Mill
Heating and Cooling
Mill Ventilation
Water Injection
Heating
8
SEPT-07
orkshop
- Units
8/9/2019 06 Heating & Cooling
9/20
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
8/9/2019 06 Heating & Cooling
10/20
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
SEPT-07
orkshop
ems
mill feed > 100 [C] and oriented towards
hambers: 1/3 in the 1st chamber & 2/3 in2nd
8/9/2019 06 Heating & Cooling
11/20
HGRS Tikaria_Mill
Water injection - Dev
11
SEPT-07
orkshop
ices
8/9/2019 06 Heating & Cooling
12/20
HGRS Tikaria_Mill
Standard Installation
12
SEPT-07
orkshop
8/9/2019 06 Heating & Cooling
13/20
HGRS Tikaria_Mill
Water injection Co
13
SEPT-07
orkshop
trol scheme
8/9/2019 06 Heating & Cooling
14/20
HGRS Tikaria_Mill
Heating and Cooling
Mill Ventilation
Water Injection
Heating
14
SEPT-07
orkshop
- Units
8/9/2019 06 Heating & Cooling
15/20
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
&
8/9/2019 06 Heating & Cooling
16/20
HGRS Tikaria_Mill
Dying wet componen
+/ - +
-
-
16
SEPT-07
orkshop
ts without hot gas
+
/ -
> 90 - 95 [C]
8/9/2019 06 Heating & Cooling
17/20
HGRS Tikaria_Mill
Drying wet compone
+/ - +/
+
-
17
SEPT-07
orkshop
ts with hot gas
+
-
> 90 - 95 [C]
8/9/2019 06 Heating & Cooling
18/20
HGRS Tikaria_Mill
Hot gas
Wa
ste
= Fan gas
Hot gas
Water steam
False air
+
False air
Drying wet compone
18
SEPT-07
orkshop
False air
False air
Fan gas
er
m
ts with hot gas
8/9/2019 06 Heating & Cooling
19/20
HGRS Tikaria_Mill
Hot gas generator
Fuel type Nozzle adapted to the
operating range
Control
Hot gas generator type
(start/stop sequences)
19
SEPT-07
orkshop
8/9/2019 06 Heating & Cooling
20/20
HGRS Tikaria_Mill
Drying wet compone
Parameters to play with in Gas flow path Material trajectory Material retention time
20
SEPT-07
orkshop
ts in a drying chamber
a drying chamber: