We are pleased to
forward our proposal detailing an A****** Pilot Spin Flash Dryer, Type SFD 47.
The dryer has been
specially designed for small-scale production and test work on both a campaign
and continuous production basis.
The Spin Flash
Dryer type SFD 47 is a standardized unit, which allows A******´s customers to
enjoy the advantages of our unique Spin Flash technology at a very reduced
investment level. The design of the SFD 47 unit concentrates on minimizing the
overall investment without compromising on technology, thus considering:
• Reduced material
and manufacturing cost (produced in series)
• Low engineering
cost (standard construction)
• Low cost of
packing and transportation (fits into a standard container)
• Low erection
costs (the unit is pre-mounted on supports, complete with platforms)
• Quick and easy
start-up (pre-assembled and tested prior to delivery)
• Short delivery
time
Despite being a
standardised unit, the dryer provides unique process features, e.g.:
• High inlet air
temperature up to 400 OC
• High outlet air
temperature up to 180 oC
• Air flow
flexibility over the complete operational range (control by frequency
converters)
• Safe operation.
The drying chamber and outlet filter (optional) are pressure shock resistant to
10 bar.
• Dryer
configuration flexibility is obtained through a number of standard optional
equipment items, e.g. outlet filter, feed pump assembly for slurries.
• Specially
engineered and customised equipment on request.
The Spin Flash
Dryer is found in several special versions, i.e. a pharmaceutical version, a
sanitary
version, a
wear-resistant version for abrasive products, and a closed circuit version for
solvents
containing or
toxic products.
A****** has
supplied more than 300 Spin Flash Dryers since the process was developed. Spin
Flash Dryers are widely used for organic chemicals, agro-chemicals, inorganic
chemicals, pigments and dyestuffs, pharmaceuticals, ceramics, food and feed
products and waste products.
Spin Flash dryers
are available for capacities up to 15,000 kg/h water evaporation.
Vital parts are
patented. All plants are produced under ISO 9001, certified by Lloyds. Plants
delivered within Europe are provided with CE-marking (conforming with the
Machinery Directive).
We hope that you
will find our proposal of interest and will be pleased to respond to any
questions or comments which may arise.
The feed vat is
equipped with an agitator which slowly rotates thus pressing the paste in a
downwards direction. This ensures constant filling of the feed screw conveyor
that is installed as an integrated part of the feed vat bottom.
The feed screw
conveyor is designed to ensure a continuous and uniform transportation of the
feedstock to the drying chamber. To maintain trouble-free and steady feeding,
the trough is provided with internal rails to minimize abrasion and product
rotation caused by the feed screw.
When entering the
drying chamber the feed will be disintegrated by the rotor inside the chamber
and will, consequently, form a fluidized layer at the bottom, thus giving
optimum drying conditions.
The drying air is
filtered and heated in an indirect electrical air heater. The air can be heated
up to 400°C thus offering excellent drying economy. The hot drying air enters
the air distributor and is led tangentially upwards through a narrow slit at
the periphery of the drying chamber bottom (patented design), which ensures an
optimum fluidization which is not obtained in chambers with flat bottom design.
The air velocity and the flow pattern inside the chamber are adjusted to give a
final product with the desired characteristics.
The dried powder
leaves the drying chamber with the drying air and is conveyed to the cyclone,
whereby the powder is separated from the air and discharged into a stainless
steel powder container.
The spent drying
air leaves the plant through a suction fan.
The plant is
delivered with a field operator's panel from where the entire process can be
supervised and controlled. The panel is complete with instruments, internal
wiring, motor control cabinet, and cabling to electrical users.
The general plant
design of the A****** Spin Flash Dryer takes special consideration for easy
operation and surveillance of the drying process. All relevant plant items are
easily accessible and can be rapidly dismantled for cleaning and maintenance.
Safety of
operation is essential. The drying chamber and outlet filter (optional) are
pressure shock resistant to 10 bar. This allows safe handling of organic
products, most of which involve a potential powder explosion risk.
A substantial
number of optional items are available, thus enabling a plant set-up customized
to individual needs.
Capacity
The water
evaporation rate of the dryer varies with the air temperatures applied to the
drying process.
Examples are shown
below at the maximum air rate: 400 m3/h.
Inlet Temperature
Outlet Temperature Evaporation Rate
370°C 90°C 37 kg/h
350°C 90°C 34 kg/h
300°C 90°C 28 kg/h
250°C 90°C 22 kg/h
200°C 90°C 15 kg/h
150°C 90°C 9 kg/h
Electrical Air Heater
Air inlet
temperature: variable up to 400°C (370ºC at the maximum air
rate).
Heat consumption
at 400°C: 36 kW
Power Supply
3 x 400 V + N +
PE, 50 Hz, AC
Installed Power (Basic Plant)
Feed vat agitator: 0.55 kW
Feed screw: 0.55
kW
Chamber rotor: 1.1
kW
Fan: 2.7 kW
Air heater: 36.0
kW
Chamber
Diameter (internal): 0.20 m
Space Requirements
Area: 1.34 x 1.90
Height (without
outlet filter): 1.7 m
Height (with
outlet filter): 3.0 m
Section No IV
Packed Volume (Basic
Plant) 4.3 m3
Weight (Basic
Plant)
Gross: 1050 kg
Net: 450 kg
The A****** Pilot
Spin Flash Dryer is, when not otherwise specified, made with product contact
parts in acid resistant stainless steel AISI 316 & AISI 321 and comprises the
following items:
1 Feed Vat
in stainless steel
with a volume of 42 l is equipped with a special vertical agitator, complete
with gear, totally enclosed fan cooled AC motor and frequency converter.
2 Feed Screw
situated in the
bottom of the feed vat, for feeding the product to the drying chamber. The feed
screw, which is
easily removed for cleaning, is complete with gear, totally enclosed fan cooled
AC motor, and
frequency converter.
3 Air Inlet
Filter
for efficient
filtration of the inlet air, including filter elements made in aluminium,
stainless steel
frames for filter
elements, and housing in stainless steel.
4 Electric Air Heater
for heating of the
drying air, including stainless steel heating elements built into a stainless
steel heater duct
(AISI 316). The heater is insulated with mineral wool. The heat release from
the air heater is
continuously adjustable.
5 Hot Air Duct
between the air
heater and the drying chamber in stainless steel. The duct includes all
necessary
transition pieces, insulation and cladding.
Section No V
6 Drying Chamber
of patented design
is of cylindrical shape with a bottom part made as an inverted cone
equipped with a
rotor for disintegration of the feed material. The upper part of the drying
chamber is
furnished with a classifier securing that only the dried powder is carried away
from
the drying zone.
The following parts are included:
- cylinder with
tangential air outlet
- classifier
- inverted conical
bottom
- rotor, complete
with motor and frequency converter
- flanges for easy
disassembly of the chamber for maintenance
- inspection glass
and internal illumination
- 50 mm insulation
- stainless steel
cladding
for conveying the
powder and the drying air to the cyclone.
8 Cyclone
for separation of
the powder from the drying air. The cyclone is provided with a removable top
and is connected
to the piping system by means of quick release clamps.
9 Powder Container
for collecting the
powder from the cyclone. The container is attached by means of clamps
permitting quick
detachment. A butterfly valve is situated at the cyclone bottom to stop the
powder discharge
while the container is emptied. The volume is 20 l.
10 Air Duct
between the
cyclone and the suction fan, made of stainless steel.
11 Suction Fan
of the centrifugal
type and assembled with the motor on a common support frame. The fan is
provided with
housing made in aluminium, impeller, statically and dynamically balanced,
totally enclosed
fan cooled motor, base frame with vibration dampers, and frequency
converter for
regulation of the air flow.
12 Instrument Panel
provided with:
- Invensys
Intelligent Integrator
- inlet air
temperature indicator and controller
- outlet air
temperature indicator and controller
- ammeter for the
chamber rotor, feed screw and feed vat agitator
- regulator for
chamber rotor, feed screw and feed vat agitator
- regulator for
air heater
- start/stop
buttons with running lights
- frequency
converters
- contactors
- fuses
- emergency stop
with re-set button
The electrical
panel observes among others the norms EN.60439-1 and EN.60204-1
(electrical
material on machinery) and further fulfills the demands of the EMC-directive.
13 Cabinet
made of stainless
steel, for support of the various plant items.
The cabinet will
be delivered with individual CE-marking at complete A****** delivery.
Materials and Surfaces
Components in
Contact with Product
Material:
stainless steel AISI 316TI.
Treatment: the
internal weldings in the drying chamber are ground flush to parent sheet, grit
120.
Components in
Contact with Air
Material: cold
rolled stainless steel AISI 304 and AISI 316TI.
Treatment: the
weldings are pickled.
Support
Structure and External Surfaces
Material:
stainless steel AISI 304.
Treatment: the
weldings are brushed/ground/acid-washed.
Technical Documentation
The following
technical documentation will be delivered, all in two copies:
- P/I diagram
- service
connection diagram
- motor and
instrument list
- electrical
wiring diagrams
- lay-out with
identification numbers
- parts lists with
identification numbers
- list of
recommended spare parts
- operation and
maintenance manual containing all necessary documentation for each component.
- installation
manual and start-up instructions
Exclusions
The following
items are excluded from the scope of supply:
- connections for
feed product up to feed vat
- service
connections for gas, compressed air, instrument air
- noise
suppression equipment
- any item not mentioned specifically in the specification.