Krauss-Maffei Pusher Centrifuges

1. Krauss-Maffei Pusher Centrifuges SZ

Continuous Separation

2. Table of Contents

Process data and applications
Layout
Process basics of pusher centrifuges
Double filtration technology
Process features
Mechanical features
Controls
References
Optional Features
© ANDRITZ 2011

3. Process Data & Applications

Process Data & Applications
Processing Parameters:
Average Particle Size: 80 - 2000 µm
Feed Solids Concentration:
> 20 % wt (crystalline products)
Solids Throughput:
up to 150 t/h
Basket Diameter:
250 mm – 1250 mm
Solids Recovery:
up to 99 % wt
Applications:
Bulk Chemicals
(Soda applications, NaCl etc.)
Agro Chemicals
(KCl, Ammonium sulphate, Urea etc.)
Platics/ related
(ABS, POM, Adipic acid etc.)
Foodstuff/ related
(Sodium hydrogene carbonate, Phosphoric acid etc.)
© ANDRITZ 2011

4. Layout: Process side overview

Process housing with
inspection covers
Slurry inlet (feed pipe)
Exchangeable solids
discharge
Filtrate
outlet with
separation
of liquids
Utility
connections
all on front
side
© ANDRITZ 2011
Flanged
solids
outlet
Cake wash and
basket rinsing
pipe

5. Layout: Drive Side Overview

Bearing block (cartridge design)
Main shaft
and pusher
shaft sealing
Pusher motor with pump
Main
motor
Terminal
box
Oil cooler
Dampers
© ANDRITZ 2011
Base frame serves
as oil reservoir

6.

Cross Section Pusher Centrifuge
Basket second stage
Basket first stage
Hollow shaft
Pusher shaft
Pusher control system
Feed system
Pusher plate
© ANDRITZ 2011

7. Process Basics Pusher Centrifuge

Wash liquid
Additives
Solids
Filtrate
Discharge
Final
Washing Intermediate Feeding, distribution
dewatering
dewatering
& main dewatering
© ANDRITZ 2011

8. Double Filtration Technology

Traditional Main Filtration steps
pusher plate
process
suspension is fed continuously
moves backward
The solids are retained on the screen
rear position
loose suspension slides backward
moves forward
Loose suspension becomes compressed
moves forward
Solids become pushable and pushes
the cake to the front
forward position
feed zone is flooded up to the cake surface
moves backward
a portion of the newly created cake
slides backward
© ANDRITZ 2011

9. Process Features

Process Housing
Features:
Removable inspection cover
Large door to process area
Feed pipe through top of housing
Door hinge on SZ 630 and larger size
Tangential Inspection covers for easy
basket shell inspection
User benefits:
Best access to process area
Easy maintenance without removal of
connections and heavy parts
© ANDRITZ 2011

10. Process Features

Slurry Feed System
Features:
Gentle product acceleration
High filtration rate
Homogeneous product distribution
leads to smooth operation
User benefits:
High product quality
Reduced maintenance costs
High availability
Feed impeller with
acceleration cone
Bolt distributor with
acceleration cone
© ANDRITZ 2011

11. Process Features

Slot Screen
Features:
Low profile screen
Basket with tapered drain holes
Only one or two sections per basket
More free filtration area (open area)
User benefits:
Low solids attrition
Easy installation
Reduced sediments between
basket and screen
Easy cleaning of basket exterior
Reduced down time of machine
Accurate distance between wear ring
and screen
Standard design welded screen
Milled slot screen (alternative)
© ANDRITZ 2011

12. Process Features

Wear Rings
Features:
Exchangeable wear rings
Accurately manufactured slot to screen
User benefits:
Reduction of solids lost with filtrate
Reduction of consumables to a minimum
Standard design wear ring
Wiper segments (alternative)
© ANDRITZ 2011

13. Mechanical Features

Housing Sealing
Features:
Simple and contact free sealing of
process area( absolute no product
contamination)
Standard water free design
Water design alternative available
Gas tight alternative available
User benefits:
Safe operation
Maintenance friendly
© ANDRITZ 2011
Sealing gas
connection (air)

14. Mechanical Features

Pusher Shaft Sealing
Features:
Multiple seal rings
Leakage control device
User benefits:
No possibility of cross -contamination
product / lubricants
Safe operation
Simple check of sealing condition
© ANDRITZ 2011
stroke
length

15. Mechanical Features

Cartridge
Features:
No disconnecting of process piping during
maintenance
Maintenance possible in a workshop
Replacement against spare cartridge possible
User benefits:
High availability
Reduced maintenance costs
© ANDRITZ 2011

16. References

80 years of experience
3.500 pusher centrifuges world wide
Pusher centrifuges including pre-thickening systems
Test and rental units available
Krauss-Maffei SZ 1250 – largest pusher in the world
© ANDRITZ 2011

17.

ANDRITZ KMPT GmbH
Industriestrasse 1-3
D-85256 Vierkirchen
Phone: +49 8139 80 299 0
[email protected]
www.kmpt.com

18. Foundation Alternatives

Set up on rubber pads
Set up on concrete or steel foundation block
© ANDRITZ 2011