This document provides information about Bulk Solids Handling company Saxlund. It discusses several of their bulk material handling machines and components including:
- Sliding Frame technology for discharging materials from flat bottom silos in a first-in, first-out manner at rates up to 130m3/hr.
- Push Floor technology for discharging non-free flowing materials from bunkers at rates up to 500m3/hr using reciprocating pusher frames.
- TubeFeeder technology for continuous reclaim of materials from bunkers and stockpiles at rates up to 400m3/hr using an open screw inside a perforated rotating tube.
- Hydraulic Rotor and other technologies
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• Base sump provides a dispensing well and enclosed spill compliant sump with drain. Choose between 1 and 2 drum designs
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• Durable construction provides 1500/3000 lbs load capacity for the base,
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• Optional dispensing shelf attaches to stacking pieces for additional stability.
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This modular system allows you to securely store and dispense from horizontal 55-gallon drums while providing spill protection.
• Base sump provides a dispensing well and enclosed spill compliant sump with drain. Choose between 1 and 2 drum designs
• Stacking pieces rest on top of drums and provide a solid base for a
second/third layer of drums.
• High Density Polyethylene provides long life
• Durable construction provides 1500/3000 lbs load capacity for the base,
and 1200/2400 lbs for the stacking piece
• Optional dispensing shelf attaches to stacking pieces for additional stability.
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2. w w w . s a x l u n d . c o . u k
Welcome
Here at Saxlund, we thrive on being at the forefront of the bulk
solids handling and storage industry. Our dedicated team of
professionals are constantly developing new machinery and
components, to ensure we give you the customer the best quality
possible and keep Saxlund the industry standard.
Over the last 50 years our group have had constant demand from
companies worldwide. We offer a complete solution - bespoke
design, construction, commissioning and comprehensive “after-sales”
support.
Our specialist knowledge, with particular expertise in flat bottom
silos and bunkers, can be applied to bulk materials and alternative
energy solutions for industries including cement, bioenergy,
wastewater and recycling.
3. Contents
Sliding Frame 2 - 3
Push Floor 4 - 5
TubeFeeder®
6 - 7
Hydraulic Rotor 8
SAX-TDS 9
Chain Conveyor 10
Solids Pump 11
Screw Conveyor 12
Bucket Elevator 13
Typical Systems 14 - 15
Service and Maintenance 16
Saxlund BioEnergy 17
“Saxlund is a much respected brand in the UK,
and has established an extremely competent team
of engineers and project managers able to tackle
complex projects in a variety of fields.
The foundations for a success have been laid
and I’m excited to be able to lead Saxlund into
the future”
Matt Drew
Managing Director
4. w w w . s a x l u n d . c o . u k
Sliding Frame technology was developed and patented by Saxlund
back in the 1960’s as a method of discharging non-free flowing
materials from a round flat bottom silo. Since then the Saxlund
Sliding Frame has been successfully used extensively around the
world in thousands of installations.
The original Saxlund Sliding Frame utilised a single element
reciprocating across the bottom of the silo, recently we have
patented a new Twin Element Sliding Frame. This design has some
advantages for special cases and for larger silo designs.
Operating principle
Non-free flowing materials will generally form a bridge across any
hole or chute used to discharge the material and require some form
of device to “dig” the material out and break any bridges that form.
The Saxlund Sliding Frame is driven by powerful hydraulic cylinders
that reciprocate the sliding frame(s) across the silo floor. The Sliding
Frame is designed with a cross-section that when travelling in one
direction, slides under the stored material, in the other direction will
push and pull the material.
Sliding Frame
2
5. e
Therefore the Sliding Frame is designed to break
any bridges when moving in one direction, and
slide under the material when moving the opposite
direction, thereby promoting bulk material flow.
Because of this bulk material flow the Saxlund Sliding
Frame is a “First in, First out” technology, which is an
added benefit for materials that can degrade over
time such a sewage sludge cake. Material removed
by the Saxlund Sliding Frame is then discharged into
one or more screw conveyors, the control scheme
of the Sliding Frame is to ensure that these screws
are always kept full of product, to ensure accurate
metering.
Typical Discharge Rate
• Up to 130m³/hr (dependent on material
and application)
Typical Sizes
• Diameters 2.5 to 11m
• Silo capacities 5 to 2,500m³
Advantages
• Effective and simple operation
• Uniform drawdown of material on “first in,
first out” principle provides mass flow
• Largest size discharge openings possible
• Accurate discharge and metering of stored
material on demand
• Enclosed design – no odour
• External maintenance possible - even with
the silo full
• Sliding Frame moves only required loose
materials resulting in
o Low power usage -
o Low maintenance costs
• Flat bottom silos - more economical to
manufacture/maximize storage
Typical Materials
• Sewage sludge cake
• Paper sludge
• Sugarbeet pulp
• Woodchip
Typical Applications
• Tipper truck reception
• Buffer storage for metered process feed
ie (dryer)
• Truck loading - prior to onward transport
3
6. w w w . s a x l u n d . c o . u k
Designed for difficult non-free flowing bulk solids, the Saxlund Push
Floor is mainly suitable for the cement industry, timber and wood
board industries as well as for sludge cake handling in the water
industry as well as many other industries worldwide.
The Push Floor is an ‘original’ discharger design by the Saxlund
International Group for square and rectangular bunkers. The flat
bottom floor concept gives many advantages and can be used
in a number of different configurations to suit the client’s particular
requirement.
Reliable discharge and accurate metering can be achieved on
demand, providing ‘Live Storage’ feed solutions to a down stream
process for bulk solids, particularly non-free flowing, heavy, wet and
difficult to handle materials.
Operating Principle
A series of parallel pusher frames (ladders) are connected to a
series of hydraulic cylinders located at one side of the Push Floor.
Each ladder performs a reciprocating motion on the flat bunker
floor shearing a layer of material from the bunker into a collection
conveyor. ‘Stop tubes’ and ‘levelling rolls’ can be incorporated for
smoothed discharge if required.
Push Floor
4
7. The Push Floor discharge machine can be used in
three basic configurations.
• SB pushes material to one end of bunker
• ZB pulls material to one end of a bunker
• SZB push and pulls material to the centre of a
bunker
The Push Floor can be used to fill a screw conveyor,
chain conveyor or solids pump etc. according to the
feed requirements of the next process.
The Push Floor can also be used as a ‘drive in,
tip and leave’ machine or indeed as a stockpile
reclaimer.
Typical Discharge Rates:
• Up to 500m3
/hr per module
Typical Floor Sizes
• Up to 9m wide per section of floor
• Up to 25m long
• Multiple floors can be used dependent on
space constraints
Advantages
• Effective and simple operation
• Uniform draw down of material on
“first in, first out” principle provides mass
flow
• Accurate discharge and metering of stored
material on demand
• External maintenance possible - even with
full bunker
• Low power usage - ladders move only
required loose material
• Low maintenance costs
• Flat bottom bunkers - economic to
construct and maximize capacity
Typical Materials:
• Wood chips
• SRF and RDF
• Wood pellets
• Tyre chips
• Shredded waste wood
• Palm nut kernels
• Peanut husks/olive waste
• Sludge cake
• Bark
Typical Applications
• Biomass Power Station Fuel Store
• Secondary Fuel Store
• Truck Reception Bunker
• Truck Loading System
5
8. w w w . s a x l u n d . c o . u k
TubeFeeder®
The TubeFeeder®
provides continuous reclaim of bulk materials from
rectangular bunkers, large-diameter silos and open-to-air stockpiles.
The patented TubeFeeder®
consists of an open screw conveyor
housed inside a rotating tube. The tube is perforated with a regular
slot pattern permitting ‘activated’ material to fall on to the screw
conveyor eliminating the external static material pressure on the screw
and presenting a uniform feed to the internal screw conveyor.
Designed to provide continuous, high-volume reclamation of bulk
materials, the TubeFeeder®
system is energy efficient, consuming as
little as 25% of the power needed for traditional open screw reclaim
systems.
It also provides gentle handling of the materials and can be installed
in flat-bottomed bunkers and silos with large spans and diameters,
in addition to open-air stockpiles.
The TubeFeeder®
is well suited for processes that require a high
level of accuracy, offers a superior solution for industries that place
exacting demands on efficiency and performance of their materials
handling processes.
6
9. Typical Discharge Rate
• Up to 400m3
/hr (with a 4:1 turndown)
Standard sizes:-
• Linear: - 14m working section
• Radial:- 19m working diameter
Advantages
• Energy consumption typically 25% of
conventional travelling or sweeping open
screw
• Consequently – low energy consumption =
low wear on components = long design life
• Homogenous even feed through slots
along the whole tube length
• Full section reclaim evens out material
quality (moisture or size) variations
• Creates mass flow with ‘first in, first out’
pile handling
• No axial forces – “closed force system”
between auger and tube
• No jamming of material against floor
• Static material head load eliminated due
to tube action in pile section
• Low wear - tube undercuts material, so is
not subject to full head load
• Proven technology with many references
Typical Materials
• Hacked wood chips
• Re-cycled chips
• Sawdust
• Wood Pellets
• RDF
Typical Applications
• Biomass Power Station Fuel Feed Store
• Particle Board Industry Raw Material Store
Industries
• Board
• Paper
• Biomass energy
• Pellet plant
Operating Principle
• The tube feeds along its entire length as it rotates.
• Material is fed through special toothed slots as the
tube rotates.
• Material bridges over the slots when not in operation.
• The tube activates a layer of material around it when
rotating.
• The head load is eliminated since the tube virtually
floats subject only to radial forces.
• The internal screw conveys material to the end where
it is collect by a (belt) conveyor.
• In rectangular bunkers, the unit is supported at both
ends by electric driven trolleys on rails.
• The reclaim rate is almost proportional to tube
rotation speed and can be accurately adjusted.
The linear TubeFeeder®
reverses direction of rotation
according to travel preventing foreign objects from wedging
between the tube and floor.
7
10. w w w . s a x l u n d . c o . u k
Hydraulic Rotor
Another silo and bunker discharge machine offered by Saxlund International
is the Hydraulic Rotor system. To start its operation at low power, the rotor is
actuated without the hydraulic system at first.
After a delay of about 20 to 30 sec, the hydraulic system is switched on and
the rotor arms dig into the stored material and convey it through openings
in the silo floor to the metering screw conveyor below. The Hydraulic Rotor
discharge is mainly used for wood applications.
This discharger creates mass flow in flat bottomed circular silos for non free-
flowing and difficult to handle materials on a ‘first in, first out’ basis. This is
particularly important for silos as non-laminar discharge from a silo can cause
the silo’s structures to be exposed to uneven pressure which in the worst case
can cause the silo to collapse.
Typical Diameters
• To suit silos up to 8m
Advantages
• Starting torque remains low as rotor
arms in folded in - low power
consumption.
• Hydraulic arms driven out as required to
prevent bridge
• Arms return to rest position when not
required - less power consumption
• Working pressure of arm activation is
adjustable outside silo
• Low maintenance of parts inside silo -
no special hooks
• High reliability
• Creates mass flow of material in silo
• Minimum power = low forces =
low wear = low maintenance
Typical Materials
• Saw dust
• Woodchip
Typical Applications
• Hacked wood chip storage
• Sawdust storage
Industries
• Alternative energy
• Timber processing
• Chipboard industries
8
11. Intake Rate
• 10 - 300m³/hr
Advantages
• Self-contained
• Minimises spillage
• Full enclosed for dust control
• High throughput
• Compact
• Low power consumption
Typical Materials
• Virgin wood chips
• Recycled wood chips
• RDF/SRF
• Wood Pellets
• Bark
• ProFuel
• MBM - Meat Bone Meal
Saxlund Walking Floor Docking Station (SAX-TDS)
The SAX-TDS is designed to allow Walking Floor trailers to reverse, dock into
the system and discharge materials without spillage into a conveying system.
The SAX-TDS utilises screw conveyors to meter the material as it is removed from
the trailer and discharge into a chain or belt conveyor for transportation onto
the next process.
The SAX-TDS is supplied complete with: a roller shutter door pneumatic
expanded bellows seal with the trailer and an integrated dust filter to provide
negative pressure to minimise leaks into the environment.
As an option the SAX-TDS can also be supplied with an optional hydraulic
power pack to provide motive power to a walking floor trailer, which can then
be used to discharge the material into the process when required, thus using
the trailer as a small storage silo.
SAX-TDS Trailer Dock
9
12. w w w . s a x l u n d . c o . u k
Typical Discharge Rate
• Standard range to 400 m³/h
• Larger rates on request
Typical Sizes
• Standard sizes to 1.55m
• Max inclination (depends on materials)
Advantages
• Effective and simple operation
• Low maintenance costs
• Accurate metering
• Made from high grade material
• Complete systems from one experienced
supplier
Materials
• Sludge
• Wood chip/sawdust
• Gypsum/tyre chips
• Solid Biomass Fuels
Typical Applications
• Sludge cake
• Power station feed
• Ash handling
Typical Industries
• Wastewater
• Wood/board
• Cement
The Saxlund Chain Conveyor is a continuous operating conveyor enclosed
within a bolted rectangular cross-section casing. It may be arranged
horizontally or inclined with bends to suit the application.
Material is fed in at the inlet/bottom end. The conveying chain runs on a
special wear resistant floor and conveys the material through the upper or lower
section to the discharge opening where it is discharged. The drive station is also
installed at this outlet end.
The construction type of the conveyor chain is according to the specific bulk
material to be transported. All chain links are manufactured from high grade
drop forged steel with welded flights or to suit the application. Some materials
are conveyed in the lower strand and others in the upper strand according to
their characteristics.
Saxlund Chain Conveyors are renowned for their long service life, quiet
operation and gentle handling of the bulk solid material.
Chain Conveyor
10
13. Typical Discharge Rate
• 4 - 50m³/hr
Pumping Pressures
• Up to 100bar
Advantages
• Cost-effective modular system
• Pumping up to 45% dry solids
• Vertical or horizontal versions
• Hydraulic seals for lower wear
• Capable of pumping foreign particles
up to 200mm
• Compact arrangements available
(optional)
• Wear indicator
• Easily extended with parallel pump units
• Top entry valve design easily exchanged
• Upstream twin-shaft screw for optimum
filling ratio
Typical Materials
• Sludge cake
Typical Applications
• Pumping sludge cake into storage
• Pumping into incinerator
Industries
• Wastewater
The Saxlund Solids Pump has been reliably conveying all types of sludge cake
for many years. Transporting sludge cake in closed systems keeps it separate
from its surroundings and the environment. Unpleasant odours are now a thing
of the past. Even problem sludge cakes can be pumped without risk.
Our many years of experience are your guarantee of maximum reliability - even
when pumping over long distances 24 hours a day.
Solids Pump
11
14. w w w . s a x l u n d . c o . u k
Screw Conveyor
Saxlund Screw Conveyors are an essential part of many conveying and storage
systems. Simple design and easy maintenance, screw conveyors successfully
move most non-free flowing materials. Saxlund have a long history and
experience in the design and construction of Screw Conveyors. We manufacture
three main types:
1. Standard Shafted Screws/Conveyor
Centre shafted with fully welded flights of stainless or mild steel according to
application without a hanger bearing, these screws are used for all general
applications and up to 12m in length and 1000mm in diameter. Drives can be
chain wheel, shaft-mounted or direct driven to client’s request.
2. Shaft-less Screw/Conveyor
These are generally used for screws longer than 10m and have their casing
manufactured in 304 stainless steel. The casing is always lined with low friction
UHMWPE plastic material and they are driven by shaft mounted gear motors.
Vertical screw conveyor systems can be supplied.
3. Ribbon Screws/Conveyor
Generally used for conveying very sticky materials that otherwise cause ‘logging’
in a standard screw.
Typical Rate
• 1 - 200m3
/hr
Typical Sizes
• Up to 1000mm in diameter
• Up to 20m in length
Advantages
• Enclosed conveying of materials
• Odour and emissions contained
• Controlled Large inlet to promote the
flow of difficult materials
• Smooth and even discharge
characteristics
• Superb easy clean facilities
• Easy assembly and replacement of
component parts
Typical Materials
• Sludge cake
• Wood products
• Cement
Typical Applications
• Sludge cake conveying
• Wood chip conveying
• Volumetric metering
• Under centrifuge conveying
Industries
• Board
• Wastewater
• Paper
• Recycling
• Biomass energy industries
12
15. Bucket Elevator
Saxlund Bucket Elevators are used in many industries for transporting a variety
of bulk solid materials up a vertically use the minimum power to perform this
operation.
Saxlund manufactures two types of bucket elevator
• Steel buckets fastened to chains running over chain wheels for
heavy applications
• Steel buckets bolted to wire reinforced rubber belting running over special
pulley drums.
The elevator casing is of welded steel modular bolted construction with anti-run
back drive arrangement at the upper discharge end. Tensioning is either by
weights at the lower end or by screwed rods depending upon the application.
Individual buckets lift material vertically from an inlet and centrifugal action
discharges the buckets at the top of the elevator into a discharge chute.
The bucket elevator requires material to be fed at a controlled rate into the inlet
hopper (not flood feed).
Typical Sizes
• 6 standard sizes from 15 to 400 m³/h
conveying capacity
Advantages
• Minimum factory space
• Lower power consumption
• Reasonable maintenance expenses
• Freedom from jamming
Typical Materials
• Ash
• Wood chips
• Wood pellets
Industries
• Particle board
• Biomass fuel handling
• Cement
13
16. w w w . s a x l u n d . c o . u k
14
Push Floor System
• Push Floor Discharger
• Hydraulic Power Pack
• Discharge Chain Conveyor
• Hydraulic Cylinders
• Disc Screen
• Elevating Conveyor to Process
• Oversize Conveyor
Typical Application: Reclaiming of Wood
Chip, RDF or SRF for Gasification
Walking Floor Truck Reception, Storage
and Pneumatic Conveying
• Kiln Dosing System
• Pneumatic Conveying
• Push Floor Storage Bunker
• Chain Conveyor
• SAX-TDS - Trailer Docking
Station
Typical Application: Truck Reception and
storage of SRF for dosing into Cement Kilns
Typical Systems
17. 15
Reception and Loading of Trucks
Storage Silo
Sliding Frame Discharger
Discharge Screw Conveyor
Hydraulically Actuated Lid
Sliding Frame
Screw Conveyor
Typical Applications: Sludge Cake loading
and unloading of Trucks
Reception and Storage of Biomass
Elevating Chain Conveyor
Concrete Storage Silo
Rotary TubeFeeder Discharger
SAX-TDS- Trailer Docking Station
Typical Application: Fuel Handling System
for Biomass Fuelled Power Station
18. w w w . s a x l u n d . c o . u k
Service Maintenance
Services offered
• Replacement Parts
• Preventive Maintenance
• Training
• Troubleshooting
• Commissioning
• Upgrades
• Modifications
• Cleaning
• Shutdown Programmes
• Plant Surveys
• Inspection reporting
16
In today’s world of production demands and maintenance budgets, downtime
isn’t an option. To have the support of an experienced materials handling
company, just a phone call away, is invaluable to keep the production process
running smoothly. Saxlund’s team of engineers have vast knowledge of bulk
solid systems, gained from many years in the industry.
Saxlund can ensure downtime losses are minimised and the equipment is
returned to service as quickly as possible. Our service team are equipped with
the resources and tools to ensure the plant is operational in the shortest time.
Most sites have their own in-house maintenance team, but with the range of
equipment to be maintained, sometimes there can be a struggle to fit in the
maintenance of complex bulk solids handling systems.
Saxlund can help.
With our engineers knowledge of your processes we are able to offer a
tailored service to suit your requirements and avoid unnecessary downtime.
19. Saxlund BioEnergy
OPCON Powerbox ORC
• Production of emission-free electricity
• Produce electricity from waste water at a
temperature range of 50-95°
• Average Opcon Powerbox generates
3,400 MWh of electricity per year
• Mobile stand-alone power plant
• Easy installation
• Robust design
• Upto 800kW
• Reduce Industrial Cooling costs whilst
producing Green Energy
Biomass Combustion Plants
• 3MWth - 50MWth
• 50+ Years of Experience
• Wide Fuel Flexibility
• WID Compliant Recycled Wood
Technology
• High Combustion Efficiency
• Low emissions
• Can be supplied with -
• Steam Boiler System
• Hot Oil System for ORC
• Hot Water Boiler for District Heating
OPCON Powerbox WST-CU
• Production of emission-free electricity
• Power production from saturated steam
• Improved use of existing steam system
• Mobile stand-alone unit
• Easy installation
• Robust design
• Upto 800kW
• Utilise Steam upto 35bar (a) at 250°C
• Make Emission free electricity from
Process Steam System
• Ideal for District Heating System Upgrades
17
20. Certificate Number 1926
ISO 9001
11 Freemantle Business Centre, Millbrook Road East, Southampton SO15 1JR
T: +44 (0) 23 80 63 63 30 F: +44 (0) 23 80 63 63 43
E: info@saxlund.co.uk w w w.saxlund.co.uk
Saxlund Bioenergy AB
Augustendalsvägen 7
SE-131 52 Nacka Strand
Sweden
+46 8 580 873 00
info.bio@opcon.se
Saxlund International GmbH
Heidberg 1, 4 - 5
29614 Soltau
Germany
+49 (0) 5191 98110
info@saxlund.de
Saxlund International Ltd
11 Freemantle Business Centre,
Millbrook Road East,
Southampton SO15 1JR
UK
+44 (0) 23 80 63 63 30
info@saxlund.co.uk