drying

Paddy drying methods

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See also: IRRI rice fact sheet

IRRI related video on Paddy Drying:


Paddy drying methods

There are many different drying methods used for drying rice. They involve various drying technologies of different scale and complexity. There is no ideal dryer for drying rice since each drying method has its own inherent advantages and disadvantages. Please look at the following table and the sub-pages for more details.

Different drying methods: Technologies & characterization.

Method

Crop Flow

Drying Technology

Advantages Disadvantages

Field drying

 

Piles, racks

Losens the grain in the panicle for
manual threshing
Rapid quality deterioration

Sun drying

Batch

Drying pavements or mats

Cheap

Labor intensive

Typically poor milling quality

Heated air drying

Batch

Fixed bed dryer

Example: Flat bed dryer

Inexpensive, small scale operation possible

Local construction from various materials

Operation with unskilled labor

Moisture gradient

Labor intensive

Re-circulating batch dryer

Mixing of grain

Large capacity range

Good quality

Skilled laborers required

Medium capital investment

After-sales service requirement

Wear of moving components

Continuous

Continuous flow dryer

Large capacity

Economics of scale

High capital investment

Not feasible for small batches of different varieties

Complicated

In-Store Drying

Batch

Storage bin with aeration components
and pre-heater for adverse weather and nighttime

Excellent grain quality

Large capacity range

Pre-drying of high moisture grain

Risk of spoilage during power failure

 

 

IRRI Related Videos

 


 

IRRI RKB video on Paddy Drying Systems

 

 



Low-cost and simplicity, the Flat bed dryer