aeromatic ltd. fluid bed dryer

8/10/2019 Aeromatic Ltd. Fluid Bed Dryer

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O perat ing Inst ruct ions

lu id bed dryer

1. Principle of the Fluid Bed Dryer

The air stream, induced by the fan

(2) in the upper part of the cabinet,

passes through the air heater (7)

and the pre-filter (9). After the heat-

ing has been completed, the purif-

ied, hot air passes through the pro-

duct container (43) from bottom to

top, by which means the product is

brought to the fluidised state. The

Nylon filter set (39) which follows in

sequence prevents any carry-over

of the product. When drying pro-

ducts with a relatively high contents

of water (above 20°o), the air is

almost completely saturated with

water steam after having passed

the product once. This air is blown

into the atmosphere by means of an

2. Connection of the Fluid Bed D ryer

a)

General

It is essential that the building floor

on which the dryer shall be placed,

is level; it is not necessary to prov-

ide for a floor fastening. However,

it is recommended to lay a plate of

5-10 mm thickness underneath the

dryer in order to avoid that the rub-

ber sealing fixed to the lower part

of the door pushes the dust lying

on the floor into the cabinet when

closing the door. The inlet and out-

let air ducts should be led into the

open air on the shortest way pos-

sible and the bends be reduced to

a minimum. In order to avoid too

big air resistances, it is advisable

to increase the cross section of the

duct by 1,2 to 1,5 times of the sok-

It is very important to check the

direction of rotation of the fan mo

tor by comparing it with the direct

ion arrow fixed on the motor. The

air volume will decrease by at least

40 to 50°/o

if the direction of rotat

ion is not correct. The dryer must

be grounded at some point.

If the fan blade, which is balanced

electro-dynamically, is supplied in

unfixed condition, it is important

that this blade is protected agains

shocks. It has to be fitted carefully

AEROMATIC LTD.

Technical Air Installations

a n d A p p a r a tu s

F a r n s b u r g e r s t r a s s e 6

4132 Muttenz-Basle (Switzerland)

Phon e (061) 53 21 88



For mending small colour damages,

erhaps occuring during transport,

small quantity of paint is attached

For the dryer model ST 200 the

rubber sealing (24) supplied with

een the flanges (66). The rods

(52) are to be fixed to the lever

(105) by means of a bolt (38) and

he rods (45) to the lever (106).

b) Connect ion of s team

he control valve (34) has to be

installed outside the dryer into the

steam feed line (32) at a place eas-

ily accessible. If space is too small

between the backwall of the dryer

and the building wall, this valve

may also be fitted at the side wall

of the dryer as per Fig. 5. The cont-

rol valve is protected against dirt

by means of an easily accessible

dirt collector (33). A hand release

valve (31) has to be installed in the

steam duct before the control valve.

It is recommended to shut this valve

when interrupting drying for a lon-

ge r t ime.

c)

Electrical connection

The inlet cables leading from the

network to the electrical switch box

are to be connected with the term-

inals RST

0

and E according to

Fig. 16 for the electrically heated

apparatus and according to Fig. 17

for the steam heated dryer. RST

are the three outer conductors,

0

is the central conductor and E the

earth wire. If the switch box is

fitted outside the working room, the

following connections from the ap-

paratus to the switch box have to

be effected:

In case of direct starting (ST 15) a

our pole cable from the terminals

UVW at the fan motor contactor

and 0

or E at the terminal board

o the corresponding terminals at

he fan motor according to the loc-

al prescriptions. In case of a star-

elta starter (ST 30, ST 60, ST 100,

ST 200) a seven pole cable from

ontactor and 0

or E at the term-

nal board to the corresponding

In case of a steam heated dryer the

t steam valve (34) has to be

n case of electrically heated dryers

terminals U1 V1

W 1

U2V2

box. When having an automatic

shaker the shaker motor has to be

connected with a four pole cable

to the contactor with the terminal

mark UaVaWa and to the terminal

board

0 or E.

The signal (26) must be connected

to the terminals a and d too. Finally

one end of the self safety control

line (103) has to be inserted in the

plug (104) on the top of the dryer

and the other end in the socket of

the switch box.

Attention: The self-safe control line

has to be laid separately, i.e. with

a distance of at least 20 cm, on ac-

count of inductive effects by the

remaining lines.

The corresponding actuating tens-

ion is always 220 volts and has to

be protected externally to 6 A. The

feeding wires have to be connected

to the terminals a b in the electrical

switch box as per Fig. 16 or 17. Is

no actuating tension of 220 volts

available, the customer has to prov-

ide for a transformer. The capacity

of the transformer is calculated as

follows: Amount of power input of

all magnet coils multiplied by 0,5.

The power input of the single mag-

net coils is as follows:

a ) Motor starters:

Typ DSL 10

65 VA

Typ DSL 310

130 VA

Typ DSL 330

320 VA

Typ DSL 350

840 VA

Typ DSL 359 840 VA

b )

Heating contactors:

Typ DSL 30

160 VA

3. Operation:

a)

Before the drying process

1 .

Filling in of the product into the

product container (43). The filled

in material shall immediately be

dried and shall not remain in the

dryer in undried condition.

2. Pushing in of the container into

the dryer cabinet.

3.

Fastening of the container by

means of turning the lever (44).

4.

In case of dryers with earthing

basket the plug (41) of the earth-

ing cable (40) has to be conn-

ected to the plug coupling (37).

5 .

Setting of the temperature at the

potentiometer (29).

6. Setting of the drying time at the

t imer (25) .

7.

Setting of the recirculating air

flap (5) by means of the handle

(16). (The recirculating air flap is

not standard and is installed at

special request only. When dry-

ing products with a low moisture

contents, a larger volume of re-

circulating air may be added to

1 . Shake off the filter set (39). In

case of an automatic shaker,

press the button (48) and switch

off the shaker motor by pressing

button (49) after about 10 sec-

o n d s .

2 . Lower the product container by

turning the lever (44).

3 . Drive out and discharge cont-

a i ne r ( 4 3) .

4.

Protection against ex plosions

( s ee F i g . 20 ) .

a) Explosion panels in the back- or

side wall of the dryer

All our dryers are equipped with

explosion panels (71) as additional

safety devices which serve the pur-

pose to have the explosion pressure

escape in case an explosion should

arise. The panels consist of a sheet

steel frame, one or several easily

movable polyester flaps, complete

rubber sealing and various hinges.

Owing to the low-pressure in the

dryer the flaps are pressed against

the rubber sealing during the dry-

ing process. They open instantly in

a time of about 0,1 sec. when the

slightest over-pressure occurs. It has

to be observed that the dryer is

possibly placed towards an outer

wall and that a channel (20),pos-

sibly without bends and leading in-

to the atmosphere, is fixed to the

f rame.

b)

Device for eliminating electros-

tatic charges

The earthing baskets (42 and 76) in-

stalled in the material container

serve the purpose to eliminate elec-

trostatic charges. The elimination

of the charges in the filter set is

effected via the wire rope (24) to

the mass of the cabinet.

c) Earthing control device

The earthing control device (75)

allows the setting to work of the

dryer only then when a conductive

connection is effected between the

ing alcohol or solvents it is un- 2

der no circumstances permitted

to add recirculating air to the

fresh air.

8.

Press the starter button (22).

9. Slowly open the air control flap

(3) by turning the lever (15) until

the product fluidises. Should the

product not fluidise, the air flap

has to be opened and closed

quickly a few times.

1 0. After the time set at the timer

has expired, the fan switches off

a u t o m a t i c a l l y .

b) After the drying



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d)

Explosion-proof electrical

instruments

All electrical operating instruments

are self safe and consequently ex-

plosion proof. This is achieved by

connecting them to a self safe cir-

cuit and therefore the current flow-

proof. If the dryer is installed in a

working room where all electrical

parts are explosion proof, this

switch box has to be mounted out-

side this working room.

5. Mounting and dismou nting of the

Nylon filter set

a)

Comm on multi sleeved type fi lter

The single filter sleeves (39) are

first hung up in the loops of the

ring (6) and then fastened to the

filter bag frame (4) by means of a

stretch band (80); see Fig. 4. The

shaking off of the filter set is effec-

ted by moving the lever (17) a few

times. The dismounting of the filter

is effected in reverse sequence.

b)

Ex-filter

(see F ig . 20)

The Nylon filter bag (39)

is put over

the grounding matrix (76)

ou ts ide

the dryer (see Fig. 14), whereupon

the two nuts (50) are to be tight-

ened (see Fig. 13). Then, the lower

part of the bag is turned up by

about 20 cm and fastened to the

corresponding loops (56).The comp-

lete set is then placed on the filter

bag frame (4) and inserted in the

plug coupling (85) (see Fig. 16).

Now the loops are loosened again

and the lower part of the filter let

down. The fixation of the filter in

the plug coupling is then effected

by inserting the bolt (84) (see Fig.

17). After the filter has been fixed,

it is lifted by pulling down the

handle (86) and clamped automatic-

ally in the catching device (87) (see

Fig. 18). Finally the cylindrical part

of the filter is fixed to the filter bag

frame (4) by means of the steel

band (80) (see Fig. 19). The stretch-

ing of the filter is effected by pull-

ing out the clamping bolt (88).

When dismounting the filter, the

shaker lever (17) has to be pulled

down and the clamping bolt (88)

inserted. Then, the toggle lock of

the steel band of the filter is loos-

ened and the lower part of the filter

turned up again and fastened to

the loops. Hereupon, the handle (78)

has to be pulled down with one

hand, whereas the other hand has

to hold the whole filter set at the

handle (86) at the same time. It is

important to hold the filter set,

otherwise it my fall down on the

container. Now the complete set

may slowly be let down on the fil-

ter bag frame. The clamping bolt

(84) is pulled out and the filter can

be removed from the plug coupling.

By pulling down the lever (17) sev-

eral times, the dust accumulated in

the filter will be shaken off.

6. Description of the electrical

installation

1 timer (25) for setting the drying

t ime

1 Potentiometer (29) for setting

the drying temperature

2 push buttons On-Off (22 and

23)

for actuating the motor

thermometer (13) for indicating

the inlet air temperature

1

thermometer (14) for indicating

the outgoing air temperature

b )

1 AC motor (1) for driving the

blower fan

c )

Electrical heating: a number of

heating elements

Steam heating: a control valve

(34) for steam injection

d )

Additional switching elements:

temperature feeler (21) (measur-

ing of resistance by means of

nickel spiral), 2 excess tempera-

ture fuses (bi-metal switch item

12), 1

excess temperature safety

fuse (8 - for increased safety air

h e a t e r o n l y )

e )

Switch box (28) with:

1 star-delta starter for actuating

the fan motor (dryer model ST

15 for direct starting). The spe-

cification of the models of the

contactors, the size of fuses

and the setting value of the

over current relais are to be

taken of the diagrams Fig. 16

and 17.

1 to 18 heating contactors for

switching on and off the heat-

ing elements of the electrical

air heater. The number of the

heating contactors and the size

of the corresponding fuses may

be seen out of the diagram

Fig. 16.

Various safety elements (92).

Number and size according to

c a p a c i t y .

1 assistant contactor for the swi-

tching on of the heating cont-

actors (only necessary for the

electrically heated dryer)

1 electronic temperature control

block (93) for temperature cont-

r o l

1 electronic ex control block (94)

for effecting the self-safety

1 electronic ex control block (95)

for effecting the self-safety (in-

stalled only when automatic

shaker fitted)

1 electronic modulator (74) for

eliminating the control-inaccur-

acy affected by the heating

capacity of the air heater (for

steam or hot water heating only).

Functioning of the electrical install-

ation:

The drying time, determined by tests,

is set for each individual product at

the timer (25) on the instrument pa-

nel (57). Thus, the self-safe control

circuit is closed and the installation



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Fig.

18

Fig. 19

is interrupted and the dryer is out

of operation. One electronic ex

control block serves to effect the

self-safety mentioned and actuates

the corresponding contactors. Also

on the instrument panel (57) a pot-

entiometer (29) is installed for the

temperature control. This potent-

lt

eter forms a bridge switching

eth e r with the temperature feeler

(21) and three precision resistances

contained in the electronic control

block. When the set drying temper-

ature is exceeded, i.e. when the

nickel spiral of the feeler reaches

a certain resistance value, the elec-

trical bridge is equilibrated and the

steam shut-off valve switched off

or the circuit of the heating cont-

actors interrupted. In the reverse

sequence, when the drying temp-

erature falls below the set value,

this electric bridge is tuned off and

the steam valve switched on again

and the circuit of the heating cont-

actors closed respectively again. An

electronic temperature control block

serves to strengthen the exremely

low bridge tension; consequently it

actuates the corresponding cont-

ac to rs .

In cases where the thermal inertia

of the air heater owing to strong

temperature increases above the

set value is perceptible (in cases

of steam-heating only), the air he-

ater has to be fed intermittently

ith energy during the heating-up

period. The effect of this feeding is

ascertained in intervals by the temp-

erature control block (93). A so-

called electronic modulator serves

to remove the control inaccuracy

caused by the heating capacity of

the air heater.

Setting of the modulator

( s ee F i g . 21 )

The modulator is set in the supplier's

workshop on account of values ga-

thered by experience. Owing to the

variety of the heating systems being

applied, it may perhaps be neces-

sary to adjust the modulator esp-

ecially when during operation too

big a temperature fluctuation is be-

ing registered. The adjusting is done

as follows:

a )

Higher setting of temperature

above the nominal value:

The screw slit (79) of the trim-

potentiometer (82) has to be

turned in counter-clockwise dir-

ection. If this is of no use, the

screw slit (83) of the trim-pot-

entiometer (81) has to be turned

in clockwise direction.

b ) Inferior setting of temperature

below the nominal value:

The screw slit (79) has to be

feeler (21) for the temperature cont-

rol. For your guidance, the trim-pot-

entiometer (82) influences the in-

jection time, the trim-potentiometer

(83) the intervals.

Th e excess temperature safety fuse

This fuse is formed by the bi-metal

switches (8 and 12) which are ar-

ranged in the air stream before and

after the air heater and on the

electrical heating elements respect-

ively (for increased safety air hea-

ters only). These bi-metal switches

are an additional safety for excess

of temperature in case any action

of the control elements should fail;

in such case they interrupt the self-

safe control circuit. When the temp-

erature falls below the admissible

temperature, the control circuit will

be closed automatically again and

by pressing the button

"on» (22)

reset in operation.

Explanation to the electrical wiring

diagrams

The electrical switch box may be

affixed to the dryer only when the

entire electrical installation of the

working room is not of explosion-

proof nature; otherwise this box

must be flushed through with comp-

ressed air or be fixed outside the

working room. If the dryer is not

equipped with an earthing control

device, the terminals 1 and 2 of the

instrument panel are to be bridged

over .

a) to Fig. 16

This drawing shows the current

running plan of an electrically

heated dryer. For the dryer model

STe-15 the connexions X, Y and

Z are omitted, because the fan

motor is started directly. If no

automatic shaker mechanism is

installed, the starter (96), the ex-

control block (95) and the instru-

ment panel (27) are omitted as

well as the signal lamp. The num-

ber of the heating contactors

(91) depends on the heating cap-

acity as well as on the working

tension (1 to 18 pieces).

b) to Fig. 17

Th is

drawing shows the current

running plan of a steam-heated

dryer. For the dryer model STd-

15 the connexions X, Y and Z

are omitted, because the fan

motor is started directly. If no

automatic shaker mechanism is

installed, the starter (96), the ex

control block (95) and the ins-

trument panel (27) are omitted.

Any breakdowns that may arise

slight stroke. If the contactors rattle

considerably, either the actuating

voltage deviates too much from the

voltage of the bobbins (deviations

of ± 10

0 /0 admissible), or the mov-

able elements at the contactors are

hindered from working properly. It

is also possible that accumulation

of dust may cause this chattering.

In case of a breakdown of the elect-

rical unit first of all it must be

checked whether the heat bundle

of the starter (red button) has an

electrical passage (terminals 95 and

96) and whether the grounding bas-

ket (42) is by means of the cable

in connection with the instrument

panel (57). If the breakdown is still

not overcome, the bi-metal switches

have to be checked as to contact

and the temperature feeler as to

resistance (about 30 Ohm). Only

after all these points have been

checked, the circuit has to be

checked, beginning with the motor,

heating, contactors. Please see also

the attached wiring diagram in this

connection (16 and 17).

7. Automatic shak er mechanism

( s ee F i g . 23 )

With the dryer model ST 200 the

shaking off of the filter bags is

effected automatically. The automa-

tic shaker may also be incorporated

in the dryer models ST 30 through

1 0 0 .

The shaker arm (53) is actuated by

the eccentric (54), resting on the



ackaging — rocessing

Bid on Equipmen

1-847-683-7720

www.bid-on-equipment.com

____-- 84

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Packaging - Processing

Bid on Equipment

1-847-683-7720


68

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Fig. 23



onto the eccentric (54), but the

provided rubber buffer (64). The

rubber buffer may be put in the

by adjusting the

single

should

not stretch sufficiently or cannot

e inserted or taken out easily, the

eight of the bag ring (6) may be

djusted by means of the threaded

od (68). If the shaker arm (53) is

not pulled upwards sufficiently high

nough, the spring (61) may be

shaker device is effected by push-

ing the button (48) installed in the

special instrument panel (27), and it

is switched off by pushing the but-

ton (49). The signal lamp (26) flu-

shes during the shaking procedure.

8. Maintenance of the dryer

The inlet air filter (9) should be

spray-washed by water approximat-

ely every two or three months dep-

ending on the amount of dirt and

should be replaced after about one

year. If constantly the same gran-

ular material is being dried, the

filter sets (39) are to be washed

approximately every two weeks

(temperature max. 60°C). The ret-

aining screen of the material cont-

ainer (43) shall be cleaned period-

2

ically. — For the maintenance of

the motor, please use the general

operating instructions of the motor

suppliers. According to the content

of lime in the steam the magnet

valve has to be decalcified by dipp-

ing in Brindizin about every year.

In order to keep the rubber gaskets

flexible at the doors, explosion

panels, divider panels and frames,

it is recommended to smear the

same periodically with glycerin. The

bolts of the hinges of the explosion

panels should always be well lubric-

ated. It is essential to check per-

iodically the proper function of the

explosion panels by lifting the pan-

els away from the framing.

ackaging — rocessing

Bid on Equipment

1-847-683-7720


Key:

1 AC motor

2 blower fan

3 air control flap

4 filter bag frame

5 re-circulating air flap

6 bag ring

7 air heater

8 excess temperature safety fuse

9 inlet air filter

10 feeler to inlet air thermometer

11 feeler to outgoing air thermo-

meter

12 excess temperature safety fuse

13 inlet air thermometer

14 outgoing air thermometer

15 lever to air control flap

16 lever to re-circulating air flap

17 lever to shaking device

18 door

19 sight glass

20 expansion channel

21 resistance feeler

22 push-button «on» fan

23 push-button «off» fan

24 wire rope

25 timer for drying time

26 signal lamp

27 instrument panel

28 electric switch box

29 potentiometer

30 air inlet

36 condensate drain

37 plug coupling

38 bolt with snap ring

39 Nylon filter set

40 grounding cable

41 plug

42 grounding basket

43 material container

44 lever to trolley

45 lever rods

46 trolley

47 scale for re-circulating air flap

48 push-button «on» shaker

49 push-button <off» shaker

5 0 n u t

51 air outlet

52 connection lever to control flap

5 3 s h a k e r a r m

54 eccentric disk

5 5 s c r e w s

56 loops

57 instrument panel

58 rubber bearing

59 hinges to explosion flaps

60 pillow block

61 spiral spring

62 stretcher

63 friction roll

64 rubber buffer

65 angle

66 flange

67 gear motor

73 grounding duct

74 modulator

76 Ex filter matrix

77 pointer to re-circulating air flap

78 handle

79 screw-slit

80 steel band

81 trim-potentiometer

82 trim-potentiometer

83 screw slit

84 stopping bolt

85 plug coupling

86 handle

87 catching device

88 stopping

90 starter for fan motor

91 heating contactor

92 safety element

93 electronic temperature control

b lo c k

94 electronic ex control block

95 electronic ex control block to

automatic shaker

96 starter for shaker motor

97 terminal

98 multi-polar plug to 103

99 terminal board

100 connection with grounding

b a s k e t

101 connection with excess temper-

a t u r e s a f e t y f u s e ( 8 a n d 1 2 )

102 connection to temperature



Techn ica l

data

ST-15

T - 3 0

f

is-T-150.200

ST 2t(

35

cD

K

- Dimensions

1111%••••••

BCDE

G H

S T-15 965 745 200 550 715 788 790 1993

S T-30 11 84 884 300 720 765 834 790 1972

ST-60

1644 1154 470 1000 820 890 790 2252

ST-100

1854

1545

600 1200

923

990 790

2 452

ST.-1 50 2308

1720

700 1450

1000

1075 790 2663

ST-200 2716

2056

800 1700

973

1204 1217

2969

fi l ling weight of humid p rod uct in kgs

5-22

0 - 4 5

drying time in mins.

0-50

0 - 5 0

R . P . M . o f f a n

9 0 0

9 0 0

a i r volume in m

3

/min

5

0

S t a t i c p r e s s u re i n m m W S

0 0

0 0

c a p a c i t y o f c o n t a in e r in l i t re s

0

7 5

motor power in H P

, 5

h e a t in g c a p a c i ty : a ) s t e a m h e a t e d i n k c a l /h

000

1 0 0 0

- b ) e l e c t r i c a ll y h e a t e d i n K W 1 0 , 8

9 , 6

heating up of air from C

to '0

15 to

50 —10 to 50

D

0 View of rear wal i of dry er

s t e a m c o n n e c t io n

c o n d e n s a t e c o n n e c t io n

e x h a u s t a i r

1

s u p p l y a i r

ST-60 ST-100

ST-150

ST-200

60-90 100-150 150-225 200-3,20

20-50 20-50

20-50

20-50

2900

1460

1450

1450

60

100

150

200

300 300

300 300

380

580

770

1 1 3 0

12

20 .

27 35

62000

100.000,

150000

200000

75,6

12 6

— —

—10 to 50

— 1 0

to 50 , —10 to 50

— 1 0 t o 5 0

H 1

J

K

L

M NOP

Q

R

2 2 8 5

70 0

71 893

1293

83

123

58

8 8 0

140

24 02

75 5

117 939 1 3 39

89

189

62

1019

184

2 8 8 0

1095

102

99 5

1395

1 46 296

70

1 2 8 9

284

3 11 0 1 095

1851095

1495

128

228

70

1730 310

3307

1470

150

1 1 8 0

1580

2 06

431

70 1 905

400

3630

1470

2 73

1405

1805

2 53

503

67 2241

650

Packaging Processing

aeromatic ltd. fluid bed dryer

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