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<strong>Disc</strong> <strong>Filter</strong><br />
<strong>Boozer</strong><br />
3 / 2009 e
Rotary Vacuum <strong>Filter</strong>s of <strong>BOKELA</strong><br />
The continuous operation, the high performance capacity and the low space demand make<br />
rotary filters the most economical solution for a wide range of solid-liquid separation tasks.<br />
<strong>Disc</strong> <strong>Filter</strong> <strong>Boozer</strong> Drum <strong>Filter</strong> Pan <strong>Filter</strong><br />
<strong>BOKELA</strong> disc, drum and pan filters define a new state of the art in rotary filter technology and<br />
surprise with numerous innovations. The superior process and mechanical design result in<br />
• high hydraulic capacity<br />
• minimal pressure loss<br />
• high filter speed<br />
• homogenous cake thickness<br />
• 100 % cake discharge<br />
• extraordinary high throughput capacity<br />
• advanced process control system<br />
• safe operation and high flexibility<br />
The <strong>Boozer</strong><br />
New Generation of Vacuum Rotary <strong>Disc</strong> <strong>Filter</strong>s<br />
The <strong>Boozer</strong> represents a new<br />
generation of vacuum rotary<br />
disc filters<br />
The innovative filter design of the<br />
<strong>Boozer</strong> results in superior<br />
performance and operation<br />
characteristics that set a new<br />
standard for rotary disc filters.<br />
When the first <strong>BOKELA</strong> disc filter of new design was<br />
commissioned, our customer was deeply impressed by the<br />
enormous filtration capacity. The large volume of filtrate the<br />
new disc filter was able to “drink” reminded them of the<br />
capability of some people drinking beer in the pub.<br />
Spontaneously, they called our disc filter a <strong>Boozer</strong>.<br />
Impressive characteristics like the<br />
• high performance capacity by<br />
high filter speed of up to 6 rpm<br />
• large filter area per footprint of<br />
7,5 m²/m²<br />
• safe & economical operation<br />
• easy maintenance<br />
make the <strong>Boozer</strong> a superior technical<br />
and economical solution for filtration<br />
tasks, especially for applications with<br />
large slurry volumes.<br />
-1-<br />
-2-
Application Areas<br />
Different Types for Different Applications<br />
To meet the requirements of different<br />
applications and product characteristics the<br />
<strong>Boozer</strong> is available with<br />
• special designs like internal or<br />
exchangeable external filtrate pipes for<br />
abrasive products<br />
Fine and coarse seed filtration in an alumina<br />
refinery with 8 <strong>Boozer</strong> L-Types<br />
• a wide range of filter sizes differing in<br />
disc diameter and number of filter discs.<br />
<strong>Filter</strong> Type*<br />
L, MI, ME**<br />
S, XS<br />
Typical Applications<br />
alumina (fine seed, coarse<br />
seed, blend seed), coal,<br />
iron ore, copper, zinc, lead<br />
chemical, food, life science<br />
industry<br />
<strong>Boozer</strong> ME-Type (in the workshop) for filtration<br />
of coal fines<br />
* L, M, S and XS refer to different disc diameters.<br />
The L-type is the most sold <strong>Boozer</strong> filter<br />
** internal filtrate pipes (I), exchangeable filtrate pipes (E)<br />
Innovative and Intelligent Answers<br />
to Today´s <strong>Filter</strong> Challenges<br />
The design of the <strong>Boozer</strong> is the result of a<br />
systematic innovation. <strong>BOKELA</strong> designed a The <strong>Boozer</strong> is characterized by<br />
disc filter with excellent hydraulic performance. • low pressure drops lead to 100 %<br />
higher pressure difference at the<br />
filter cloth compared to<br />
conventional disc filters<br />
• double capacity compared to<br />
conventional disc filters<br />
• high filter speed of up to 6 rpm<br />
(conventional disc filters:<br />
max. 3 rpm)<br />
• 100 % cake discharge even at<br />
high filter speed<br />
• high operational reliability and<br />
flexibility<br />
• fully automatic operation<br />
• easy maintenance<br />
-3-<br />
-4-
Homogeneous Cake Formation and<br />
100% Cake <strong>Disc</strong>harge<br />
Thanks to the outstanding hydraulic system the<br />
pressure loss over the entire section from the<br />
segments to the filtrate receiver is minimal. The<br />
result is a fast and unhindered filtrate drain.<br />
The filter cake is homogeneous and of even<br />
thickness over the whole segment and at all discs<br />
due to<br />
• large number of up to 30 segments per disc<br />
leading to small sized segments<br />
• 50 % submergence of the disc into the slurry<br />
• slurry feeding at the side where vacuum starts.<br />
These characteristics are the preconditions for<br />
• the intensive and uniform cake dewatering<br />
• the low gas throughput<br />
• the complete cake discharge<br />
• cake discharge without re-wetting since no<br />
filtrate is blown back.<br />
The filter cake is 100 % removed from<br />
the filter cloth without re-wetting by<br />
blown back filtrate<br />
Outstanding Performance<br />
Specific Slurry Throughput [m³/m²h]<br />
16.0<br />
14.0<br />
12.0<br />
10.0<br />
8.0<br />
6.0<br />
4,.0<br />
2.0<br />
performance of conventional vacuum filter<br />
performance of <strong>BOKELA</strong> disc filter <strong>Boozer</strong><br />
Conventional filters fail<br />
performance because of<br />
• unsatisfying hydraulic capacity<br />
• incomplete cake discharge<br />
• weak segment fixing<br />
0 0,25 1 2,25 4 6,25 9<br />
0 0,5 1 1,5 2 2,5 3<br />
.<br />
M<br />
s<br />
= m&<br />
s<br />
⋅ A<br />
F<br />
= ρ<br />
s<br />
2<br />
η r<br />
n<br />
60<br />
1<br />
( 1 − ε) ⋅ ⋅ κ ⋅ ∆p<br />
⋅ ⋅ ⋅ A ⋅ 3, 600<br />
L c<br />
α<br />
360<br />
0<br />
F<br />
Outstanding<br />
performance of<br />
the <strong>Boozer</strong><br />
[rpm] <strong>Filter</strong> Speed<br />
[ rpm ]<br />
Square Root of<br />
<strong>Filter</strong> Speed<br />
-5-<br />
-6-
Main Components of the <strong>Boozer</strong><br />
1. <strong>Filter</strong> segments<br />
2. Centre barrel<br />
1<br />
3. Control head<br />
2<br />
3<br />
5<br />
6<br />
4. <strong>Filter</strong> trough<br />
4<br />
5. Snap blow valve<br />
6. Drive unit<br />
Main Component – <strong>Filter</strong> Segments<br />
Easy Handling of Light Weight Segments<br />
Each filter disc consists of up to 30 small sized<br />
and light filter segments which are mounted<br />
onto the centre barrel.<br />
The <strong>Boozer</strong> segments provide<br />
channel rings<br />
• optimal hydraulic conditions by<br />
zero-resistance design<br />
‣ fast filtrate drainage and cake<br />
discharge in less than 0.2 sec.<br />
• high stability of the filter disc<br />
‣ self fixing and sealing metal bayonet<br />
‣ channel rings make discs extra<br />
robust<br />
• low cost for filter bags<br />
• easy handling<br />
‣ the light weight segments of < 20 kg<br />
make servicing easy.<br />
-7-<br />
-8-
Main Component – <strong>Filter</strong> Segments<br />
Excellent Filtrate Clarity due to Tight <strong>Filter</strong> Bags<br />
The filter bags are designed to meet<br />
today´s filter demands<br />
• tough, resistant to tearing and well<br />
sealed<br />
‣ this leads to excellent filtrate<br />
clarity.<br />
• fast and simple fixing with cable ties<br />
Bayonet Fixing<br />
The specially designed segment bell<br />
provides<br />
• smooth and tight fit of filter bags<br />
• easy mounting of filter bags.<br />
Cloth Fastening with Cable Ties<br />
Main Component – Centre Barrel<br />
External and Internal Filtrate Piping<br />
External filtrate pipes:<br />
• for high abrasive products<br />
• are easy to exchange<br />
• ensure an easy maintenance<br />
• have a trapezoidal design<br />
Internal filtrate pipes:<br />
• for non-abrasive products<br />
• prevent a built up on the<br />
barrel surface<br />
• excellent sealing<br />
exchangeable filtrate pipes<br />
-9-<br />
-10-
Main Component – Control Head<br />
High-Performance Control Head Pre-Separates Filtrate and Air<br />
The pressure loss of a two phase flow is up<br />
to 10 times higher than of a single phase<br />
flow.<br />
Therefore, the <strong>Boozer</strong> control head is<br />
designed to pre-separate the incoming<br />
filtrate/air mixture into a gas and liquor flow.<br />
Entrainment of filtrate from the cake<br />
formation zone into the dewatering zone is<br />
prevented even at high filter speed.<br />
Main Component – <strong>Filter</strong> Trough<br />
No Agitator and 50% Submergence Level<br />
Main advantageous of the<br />
<strong>Boozer</strong> trough design<br />
• no agitator since the stirring<br />
effect of the discs<br />
homogenizes the slurry<br />
• level control operation<br />
without steady slurry overflow<br />
• 50% submergence of disc<br />
• common and large sized<br />
overflow<br />
• ability to handle variable feed<br />
flow rates<br />
water test with<br />
<strong>Boozer</strong> M-type trough<br />
<strong>Boozer</strong> M-type trough (in the workshop)<br />
-11-<br />
-12-
Main Component – <strong>Filter</strong> Trough<br />
Joint Single Trough Design for the <strong>Boozer</strong> L-Type<br />
The joint single trough design of the <strong>Boozer</strong> L-type is an innovative trough design for the<br />
special requirements of large diameter disc filters.<br />
The joint single trough design combines the<br />
advantages of the common trough design<br />
(all discs rotate in a common trough) and of<br />
the single trough design (each disc rotates<br />
in a separate trough)<br />
• single compartments ensure slurry<br />
homogenisation by the rotating discs<br />
i.e. no agitator required<br />
• common and large sized overflow<br />
‣ even slurry level and an even<br />
cake thickness on all discs<br />
‣ level control operation<br />
• 50% submergence of disc<br />
common part<br />
for level control<br />
single<br />
compartments<br />
Main Component – Snap Blow Valve<br />
Complete Cake <strong>Disc</strong>harge by Quick Blowback Impulse<br />
In contrast to conventional design where blow<br />
back air is blowing steadily, the <strong>Boozer</strong> snap<br />
blow valve provides for an exactly timed, quick<br />
air blowback:<br />
• complete cake discharge with only<br />
0.25 – 0.35 bar overpressure due to quick<br />
blowback impulse<br />
• discharge of thin filter cakes of 4 – 5 mm<br />
• electronic adjustment of the precise timing<br />
for the compressed air blowback<br />
• complete cake discharge at all discs<br />
even at high filter speed<br />
• no re-wetting of the filter cake<br />
snap blow valve<br />
-13-<br />
-14-
Main Component – Drive Unit<br />
Designed for High Rotary Speeds up to 6 rpm<br />
An excellent drive unit is<br />
needed to fulfill the demands<br />
placed on today´s rotary<br />
vacuum disc filters.<br />
The powerful drive units of<br />
the <strong>Boozer</strong> enable a filter<br />
operation<br />
• with high filter speed of<br />
6 rpm to enable full<br />
automatic control<br />
drive unit<br />
• with thick filter cakes<br />
of 75 mm<br />
Control Philosophy of the <strong>Boozer</strong><br />
Only a controlled operation is a safe operation<br />
Flexible and safe operation in case of changing<br />
feed conditions by adaptation of the filter<br />
performance<br />
‣ control of slurry level by adaptation of filter<br />
speed<br />
• fully automatic operation instead of visual<br />
control by the operators<br />
• no continuous overflow thanks to level control<br />
for speed regulation<br />
• simple control circuits, easy to understand<br />
Level<br />
control<br />
-15-<br />
-16-
Easy Maintenance<br />
Fast and Simple Servicing of the <strong>Boozer</strong><br />
cloth fixing with<br />
U-profiles<br />
removable wash<br />
bars (underneath<br />
the deflector plates)<br />
anti-friction polymer<br />
cover<br />
walk-ways<br />
-17-<br />
<strong>BOKELA</strong> <strong>Disc</strong> <strong>Filter</strong> <strong>Boozer</strong> - Sizing<br />
<strong>Filter</strong> Type<br />
[-]<br />
XS<br />
S<br />
ME<br />
MI<br />
L<br />
<strong>Disc</strong> Diameter<br />
[m]<br />
2.2<br />
3,2<br />
4.1<br />
3.9<br />
5.6<br />
Filtration Area<br />
[m²]<br />
12 – 36<br />
(72)*<br />
30 – 90<br />
(180)*<br />
44 – 132<br />
(264)*<br />
40 - 60<br />
88 – 176<br />
Number of <strong>Disc</strong>s<br />
per Control Head<br />
[-]<br />
2 - 6<br />
2 - 6<br />
2 – 6<br />
2 - 3<br />
2 – 4<br />
Number of Control<br />
Heads per <strong>Filter</strong><br />
[-]<br />
1 - 2<br />
1 - 2<br />
1 - 2<br />
1<br />
1<br />
Number of Segments<br />
per <strong>Disc</strong><br />
[-]<br />
20<br />
20<br />
20<br />
20<br />
30<br />
Filtrate Pipe Design<br />
[-]<br />
internal<br />
internal<br />
external<br />
internal<br />
internal<br />
Trough Design<br />
[-]<br />
common /<br />
twin**<br />
common /<br />
twin**<br />
common /<br />
twin**<br />
common<br />
joint single<br />
Weight of segments<br />
[kg]<br />
7<br />
11<br />
19.9<br />
19.9<br />
20<br />
* maximum filter area with 2 control valves ** 2 separate troughs in case of 2 control valves (twin design)<br />
• no agitator<br />
• easy access by permanent walk-ways<br />
• light weight segments < 20kg<br />
• easy exchange of segments because of bayonetfixing<br />
• smooth handling of cloth exchange<br />
• cloth wash system with removable wash bars<br />
• maintenance-free barrel sealing<br />
-18-
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Trouble Shooting<br />
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Development<br />
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www.bokela.com<br />
<strong>BOKELA</strong> GmbH<br />
76131 Karlsruhe<br />
Deutschland<br />
Tel.: +49 721 96456-0<br />
Fax: +49 721 96456-10<br />
bokela@bokela.com<br />
<strong>BOKELA</strong> Australia Pty<br />
Building 5 Spring Lake Commercial<br />
1 Springfield Lakes Blvd<br />
Springfield Lakes, QLD 4300<br />
Australia<br />
phone : +61 7 3288 1400<br />
fax: +61 7 3288 1424<br />
bokelaofaustralia@bokela.com<br />
<strong>BOKELA</strong> do Brasil Ltda<br />
Rua Sampaio Viana 277<br />
2° andar<br />
04004.000 São Paulo – SP<br />
Brazil<br />
phone: +55 11 3052 0444<br />
fax: +55 11 3052 0443<br />
bokeladobrasil@bokela.com