Disc Filter Boozer - BOKELA

Disc Filter
Boozer
8 / 2009 e

Rotary Vacuum Filters of BOKELA
The continuous operation, the high performance capacity and the low space demand make
rotary filters the most economical solution for a wide range of solid-liquid separation tasks.
Disc Filter Boozer Drum Filter Pan Filter
BOKELA disc, drum and pan filters define a new state of the art in rotary filter technology and
surprise with numerous innovations. The superior process and mechanical design result in
• high hydraulic capacity
• minimal pressure loss
• high filter speed
• homogenous cake thickness
• 100 % cake discharge
• extraordinary high throughput capacity
• advanced process control system
• safe operation and high flexibility
The Boozer
New Generation of Vacuum Rotary Disc Filters
The Boozer represents a new
generation of vacuum rotary
disc filters
The innovative filter design of the
Boozer results in superior
performance and operation
characteristics that set a new
standard for rotary disc filters.
When the first BOKELA disc filter of new design was
commissioned, our customer was deeply impressed by the
enormous filtration capacity. The large volume of filtrate the
new disc filter was able to “drink” reminded them of the
capability of some people drinking beer in the pub.
Spontaneously, they called our disc filter a Boozer.
Impressive characteristics like the
• high performance capacity by
high filter speed of up to 6 rpm
• large filter area per footprint of
7,5 m²/m²
• safe & economical operation
• easy maintenance
make the Boozer a superior technical
and economical solution for filtration
tasks, especially for applications with
large slurry volumes.
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-2-

Application Areas
Different Types for Different Applications
To meet the requirements of different
applications and product characteristics the
Boozer is available with
• special designs like internal or
exchangeable external filtrate pipes for
abrasive products
Fine and coarse seed filtration in an alumina
refinery with 8 Boozer L-Types
• a wide range of filter sizes differing in
disc diameter and number of filter discs.
Filter Type*
L, MI, ME**
S, XS
Typical Applications
alumina (fine seed, coarse
seed, blend seed), coal,
iron ore, copper, zinc, lead
chemical, food, life science
industry
Boozer ME-Type (in the workshop) for filtration
of coal fines
* L, M, S and XS refer to different disc diameters.
The L-type is the most sold Boozer filter
** internal filtrate pipes (I), exchangeable filtrate pipes (E)
Innovative and Intelligent Answers
to Today´s Filter Challenges
The design of the Boozer is the result of a
systematic innovation. BOKELA designed a The Boozer is characterized by
disc filter with excellent hydraulic performance. • low pressure drops lead to 100 %
higher pressure difference at the
filter cloth compared to
conventional disc filters
• double capacity compared to
conventional disc filters
• high filter speed of up to 6 rpm
(conventional disc filters:
max. 3 rpm)
• 100 % cake discharge even at
high filter speed
• high operational reliability and
flexibility
• fully automatic operation
• easy maintenance
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Homogeneous Cake Formation and
100% Cake Discharge
Thanks to the outstanding hydraulic system the
pressure loss over the entire section from the
segments to the filtrate receiver is minimal. The
result is a fast and unhindered filtrate drain.
The filter cake is homogeneous and of even
thickness over the whole segment and at all discs
due to
• large number of up to 30 segments per disc
leading to small sized segments
• 50 % submergence of the disc into the slurry
• slurry feeding at the side where vacuum starts.
These characteristics are the preconditions for
• the intensive and uniform cake dewatering
• the low gas throughput
• the complete cake discharge
• cake discharge without re-wetting since no
filtrate is blown back.
The filter cake is 100 % removed from
the filter cloth without re-wetting by
blown back filtrate
Outstanding Performance
Specific Slurry Throughput [m³/m²h]
16.0
14.0
12.0
10.0
8.0
6.0
4,.0
2.0
performance of conventional vacuum filter
performance of BOKELA disc filter Boozer
Conventional filters fail
performance because of
• unsatisfying hydraulic capacity
• incomplete cake discharge
• weak segment fixing
0 0,25 1 2,25 4 6,25 9
0 0,5 1 1,5 2 2,5 3
.
M
s
= m&
s
⋅ A
F
= ρ
s
2
η r
n
60
1
( 1 − ε) ⋅ ⋅ κ ⋅ ∆p
⋅ ⋅ ⋅ A ⋅ 3, 600
L c
α
360
0
F
Outstanding
performance of
the Boozer
[rpm] Filter Speed
[ rpm ]
Square Root of
Filter Speed
-5-
-6-

Main Components of the Boozer
1. Filter segments
2. Centre barrel
1
3. Control head
2
3
5
6
4. Filter trough
4
5. Snap blow valve
6. Drive unit
Main Component – Filter Segments
Easy Handling of Light Weight Segments
Each filter disc consists of up to 30 small sized
and light filter segments which are mounted
onto the centre barrel.
The Boozer segments provide
channel rings
• optimal hydraulic conditions by
zero-resistance design
‣ fast filtrate drainage and cake
discharge in less than 0.2 sec.
• high stability of the filter disc
‣ self fixing and sealing metal bayonet
‣ channel rings make discs extra
robust
• low cost for filter bags
• easy handling
‣ the light weight segments of < 20 kg
make servicing easy.
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-8-

Main Component – Filter Segments
Excellent Filtrate Clarity due to Tight Filter Bags
The filter bags are designed to meet
today´s filter demands
• tough, resistant to tearing and well
sealed
‣ this leads to excellent filtrate
clarity.
• fast and simple fixing with cable ties
Bayonet Fixing
The specially designed segment bell
provides
• smooth and tight fit of filter bags
• easy mounting of filter bags.
Cloth Fastening with Cable Ties
Main Component – Centre Barrel
External and Internal Filtrate Piping
External filtrate pipes:
• for high abrasive products
• are easy to exchange
• ensure an easy maintenance
• have a trapezoidal design
Internal filtrate pipes:
• for non-abrasive products
• prevent a built up on the
barrel surface
• excellent sealing
exchangeable filtrate pipes
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-10-

Main Component – Control Head
High-Performance Control Head Pre-Separates Filtrate and Air
The pressure loss of a two phase flow is up
to 10 times higher than of a single phase
flow.
Therefore, the Boozer control head is
designed to pre-separate the incoming
filtrate/air mixture into a gas and liquor flow.
Entrainment of filtrate from the cake
formation zone into the dewatering zone is
prevented even at high filter speed.
Main Component – Filter Trough
No Agitator and 50% Submergence Level
Main advantages of the
Boozer trough design
• no agitator since the stirring
effect of the discs
homogenizes the slurry
• level control operation
without steady slurry overflow
• 50% submergence of disc
• common and large sized
overflow
• ability to handle variable feed
flow rates
water test with
Boozer M-type trough
Boozer M-type trough (in the workshop)
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Main Component – Filter Trough
Joint Single Trough Design for the Boozer L-Type
The joint single trough design of the Boozer L-type is an innovative trough design for the
special requirements of large diameter disc filters.
The joint single trough design combines the
advantages of the common trough design
(all discs rotate in a common trough) and of
the single trough design (each disc rotates
in a separate trough)
• single compartments ensure slurry
homogenisation by the rotating discs
i.e. no agitator required
• common and large sized overflow
‣ even slurry level and an even
cake thickness on all discs
‣ level control operation
• 50% submergence of disc
common part
for level control
single
compartments
Main Component – Snap Blow Valve
Complete Cake Discharge by Quick Blowback Impulse
In contrast to conventional design where blow
back air is blowing steadily, the Boozer snap
blow valve provides for an exactly timed, quick
air blowback:
• complete cake discharge with only
0.25 – 0.35 bar overpressure due to quick
blowback impulse
• discharge of thin filter cakes of 4 – 5 mm
• electronic adjustment of the precise timing
for the compressed air blowback
• complete cake discharge at all discs
even at high filter speed
• no re-wetting of the filter cake
snap blow valve
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Main Component – Drive Unit
Designed for High Rotary Speeds up to 6 rpm
An excellent drive unit is
needed to fulfill the demands
placed on today´s rotary
vacuum disc filters.
The powerful drive units of
the Boozer enable a filter
operation
• with high filter speed of
6 rpm to enable full
automatic control
drive unit
• with thick filter cakes
of 75 mm
Control Philosophy of the Boozer
Only a controlled operation is a safe operation
Flexible and safe operation in case of changing
feed conditions by adaptation of the filter
performance
‣ control of slurry level by adaptation of filter
speed
• fully automatic operation instead of visual
control by the operators
• no continuous overflow thanks to level control
for speed regulation
• simple control circuits, easy to understand
Level
control
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Easy Maintenance
Fast and Simple Servicing of the Boozer
cloth fixing with
U-profiles
removable wash
bars (underneath
the deflector plates)
anti-friction polymer
cover
walk-ways
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BOKELA Disc Filter Boozer - Sizing
Filter Type
[-]
XS
S
ME
MI
L
Disc Diameter
[m]
2.2
3,2
4.1
3.9
5.6
Filtration Area
[m²]
12 – 36
(72)*
30 – 90
(180)*
44 – 132
(264)*
40 - 60
88 – 176
Number of Discs
per Control Head
[-]
2 - 6
2 - 6
2 – 6
2 - 3
2 – 4
Number of Control
Heads per Filter
[-]
1 - 2
1 - 2
1 - 2
1
1
Number of Segments
per Disc
[-]
20
20
20
20
30
Filtrate Pipe Design
[-]
internal
internal
external
internal
internal
Trough Design
[-]
common /
twin**
common /
twin**
common /
twin**
common
joint single
Weight of segments
[kg]
7
11
19.9
19.9
20
* maximum filter area with 2 control valves ** 2 separate troughs in case of 2 control valves (twin design)
• no agitator
• easy access by permanent walk-ways
• light weight segments < 20kg
• easy exchange of segments because of bayonetfixing
• smooth handling of cloth exchange
• cloth wash system with removable wash bars
• maintenance-free barrel sealing
-18-

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www.bokela.com
BOKELA GmbH
Tullastr. 64
76131 Karlsruhe
Deutschland
Tel.: +49 721 96456-0
Fax: +49 721 96456-10
bokela@bokela.com
BOKELA Australia Pty
Building 5 Spring Lake Commercial
1 Springfield Lakes Blvd
Springfield Lakes, QLD 4300
Australia
phone : +61 7 3288 1400
fax: +61 7 3288 1424
bokelaofaustralia@bokela.com
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R. Santiago Ballesteros 610
Sala 6, Cinco
32010-050 Contagem – MG
Brazil
phone: +55 31 2565 0976
fax: +55 31 2565 3976
bokeladobrasil@bokela.com