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Materi Pengering
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Grain Drying and Dryers
Dry bulb temp. (℃)
Wet bulb temp. (℃)
Rel
ativ
e h
um
idit
y(
%)
Ab
so
lute
hu
mid
ity
(kg/kg’
)
Dew point temp (℃)
Enthalpy
(kcal/kg’
) Sat
ura
tio
n li
ne
Specific volume (m 3/kg)
Property of Moist Air on Psychrometric Chart
Dry bulb Wet bulb
t1 ℃h1 %
Grain layer
t2 ℃
t3 ℃h2
%
BurnerFan
A Model of Heated Air Drying
In this case, How dose sate point of air changeon psychrometric chart?
Relationship between palatability and germination
Drying & Quality 1
Relationship between cracking rate of brown rice and percentage of broken of milled rice
Drying & Quality 2
Relationship among Initial moisture content and drying air temperature and drop in germination rate.
Drying & Quality 3
Relationship among Initial moisture content and drying air temperature and serious cracking rate.
Drying & Quality 4
Relationship among Initial moisture content and drying rateand serious cracking rate.
Drying & Quality 5
Relationship among air flow rate and drying rateand serious cracking rate.
Drying & Quality 6
GrainGrain DryersDryers
Classification grain Classification grain dryersdryers
Batch type dryersBatch type dryers
Continuous type dryersContinuous type dryers
Storage type dryersStorage type dryers
Classification grain dryers 1Classification grain dryers 11.Classification by Aeration temperature
2.Classification by air flow rate
Structure Description Schematic diagram
Flat bed type
The drier which makes itprinciple to dry without
moving grain. Aventilation floor is
horizontal.
Upright type
A basic principle is thesame as the above. But
ventilation floor isvertical. When moisture ishigh, grain may be moved
several times usingthrower
Recirculationtype
While grain is drying,grain is always circulating.
Grain is drying andtempering per 1 cycle.
Uni pass type
While grain is flowingcontinuously from
entrance to exit, grain isdrying.Grain is dried to
goal moisture contents byone pass.
Multi pass type
A basic principle is thesame as the above. Grainis dried to goal moisturecontents by several pass.Grain is storaged in silobetween drying and next
drying.
Grain moving
Static
Batchtype
Moving
Continuoustype
3.Cassification by structure
Classification grain dryers 2Classification grain dryers 2
Grain dryers Grain dryers in facility in facility
(a) Country elevator
(b) Rice center
Continuous type dryer
Batch type dryer
high weight high weight high weightcm kg cm kg cm kg
1.7㎡ 41 370 43 390 45 4203.3㎡ 38 690 40 730 42 7505㎡ 36 980 37 1000 35 960
8.6㎡ 34 1200 31 1100 20 1000Note)a. Paddy density is 550kg/m3 b. Blower power is 0.37kW
Amountof grain
fordryingarea
Blower diameter 48cm 38~35cm 35~32cm
Flat bed type dryer
Burner
Suction blower
Grain
Exhaust air
Heated air
Heated air
Exhaust air
Under screw Rotary valve
Recirculating type dryer 2