Material Balance Palm Oil Mill

WHAT IS MATERIAL BALANCE?

X

MACHINE

Z

X=Y+Z

Y

BENEFITS OF MATERIAL BALANCE • • • •

• • • •

•

Maximum efficiency of machine Optimum capacity of machine Control of product losses High conformance in process consistency Good quality of products Low maintenance cost Minimum breakdown Good housekeeping, safe & conducive working environment. No pollution

MATERIAL BALANCE DATA ITEMS

% TO FFB

Empty Bunch

20 - 23

Bunch Ash

0.5

Sterilizer Condensate

16

Sterilized Fruitlet

67

Crude Oil

65 - 75

Sludge

40 - 45

Decanter Solid

3

Oil

23

Cyclone Fibre

13 - 15

Nut

10 - 14

Shell

6-7

Kernel

5-6

Effluent

80

CONSUMPTION

Electricity

15

– 20

Water

1.3

– 1.5

m3/FFB

25

– 35

kg/kW

Steam Turbine

kW/FFB

BULK DENSITY OF PALM MATERIAL MATERIAL

Kg/m3

Fresh Fruit Bunch

430

Fresh Loose Fruit

655

Empty Bunch

357

Sterilized Fruitlets

640

Presscake ex-Press

303

Nut ex-Depericarper

640

Wet Shell

670

Dried Kernel

622

Wet Kernel

660

Cyclone Fibre

140

Cyclone Dust

529

Waste Water

1014

Crude Oil ex-Press

978

Sludge before Centrifuge

1010

EXAMPLE

– NUT

b

ELEVATOR

h

a

NOTATION

DIMENSION (mm)

a

250

b

200

c

100

h

150

c

CAPACITY OF NUT BUCKET Volume of bucket

(b + c) x h/2 x a

0.00563 m3

Wt. of nut per bucket

0.00675 x 640

3.60 kg

NUT ELEVATOR …… cont

NOTATION

DESCRIPTION

VALUE

E

Mill Capacity

60 tph

F

Bucket to Bucket

400 mm

G

Gearbox Output

45 rpm

H

Driven Sprocket

28 T

I

Drive Sprocket

16 T

J

Chain Sprocket

12 T

K

Chain Size

100 mm

NUT ELEVATOR ……cont

DESCRIPTION

FORMULA

VALUE

Chain Sprocket Speed

GxI/H

25.71 rpm

Chain Speed

25.71 x J x K

30,852 mm/min.

No. of Buckets

30,582 x 60 / F

4,628 Bph

Nut Conveyed

4,628 x 4.32 / 1000 / 2

10 tph

% to FFB

10 x 100 / E

17 %

NUT ELEVATOR - CONCLUSION Capacity of elevator is more than sufficient because it can handle maximum of 17% Nut/FFB ratio against standard requirement of 14%. This also implies that nut spillage at the elevator is unlikely to occur when there is recycling. In other words, the elevator can do 70 tph milling capacity.