Heat-exchange drying system

Paddy Dryer

Freshly harvested paddy is wet, fragile and spoils fast. The MDT paddy dryer brings it down to a stable, storage-safe moisture — uniformly, with minimum broken rice — protecting both yield and quality.

From 24% to a stable 14%

Paddy arriving from the field typically carries around 22–26% moisture — far too high for safe storage or clean milling. Left wet, it discolours, grows mould, attracts pests and breaks during milling, cutting the miller's yield.

MDT's dryer passes the paddy through a column of alternating hot-air and exhaust ducts, recirculating it until it reaches a uniform 13–14%. A heat exchanger keeps combustion gases away from the grain, so colour and quality are preserved.

Uniform moisture across the whole batch ±0.5% target
Minimum broken rice protects head-rice yield
Husk, biomass, diesel or gas firing
Continuous-flow and batch / re-circulating designs

Axial Fan Type Paddy Dryer

Technical information — The axial fan type paddy dryer is the economical, high-airflow option for shallower beds and lower-resistance drying. An axial-flow fan moves air straight along its shaft axis, and these cheaper axial-flow fans provide a higher airflow rate at lower pressure, making them more suitable for shallow-bed batch dryers with low resistance to airflow. They are also used in re-circulating batch dryers where high air volumes are needed, which is exactly how a re-circulating LSU-type paddy dryer works. This makes the axial configuration a cost-effective fit for small and mid-scale mills that want dependable drying without the higher fan cost. The trade-off to note is that axial-flow fans generally run louder than centrifugal fans and are best kept to lower static-pressure duties. Like all MDT driers, it brings paddy to a safe storage moisture of about 9 to 10 % while protecting head-rice yield.

For rice mill owners — If you run a small or mid-sized mill and want dependable drying without paying for more machine than you need, the axial fan dryer is the sensible choice. It moves a large volume of air at lower cost, which suits a re-circulating dryer where the paddy passes through again and again until it reaches a safe moisture. For you, that means the same protection against the real dangers of wet paddy, mould, discolouration, weight loss and grain that shatters in the huller, but at a lower equipment cost and simpler running. It is well matched to mills that don't need to dry huge deep loads in one go, and it keeps your paddy stable and storage-ready between harvest and milling.

Centrifugal fan type paddy dryer

Technical — The centrifugal fan type paddy dryer is built for deep grain beds and high resistance to airflow. In a centrifugal fan, air enters along the shaft and is thrown outward through the impeller, which lets it build much higher static pressure than an axial fan — the pressure needed to push drying air evenly through a tall, dense column of paddy. Because deep-bed dryers need centrifugal fans providing more flow at higher static pressure than axial-flow types, this configuration suits larger-capacity MDT driers and continuous-flow columns where uniform drying through the full grain depth matters. uniform drying across the whole batch, with minimum broken rice — making this the preferred choice for high-capacity mills and demanding drying duties. Capacity range and static-pressure rating:

For rice mill owners — For a mill running large volumes, the centrifugal fan dryer is the workhorse. Its real value to you is simple: it dries a deep, full column of paddy evenly, so the grain at the bottom of the load dries just as well as the grain at the top. That evenness is money — uniformly dried paddy mills into more whole rice and less broken, which is exactly what raises your out-turn and your selling price. The centrifugal fan is what makes this possible: it pushes air with enough force to drive it right through a thick bed of paddy, so you can run bigger loads without patchy drying. Two practical bonuses matter on the ground — it handles high capacity

during peak harvest when paddy is arriving faster than you can dry it, and it runs quieter. If your priority is capacity and consistent quality on heavy daily tonnage, this is the dryer built for it.

Indicative specifications

Inlet moisture

Outlet moisture

Drying air temperature

Capacity range

Dryer type

Fuel options

Drying principle

Control

~22–26% (up to ~33% for parboiled paddy)

13–14% (safe storage / milling)

Raw paddy ~50–60 °C; parboiled up to ~80–100 °C

15 TPB to 100 TPB

Continuous-flow / re-circulating (LSU-type column)

Rice husk · biomass · diesel · gas

Hot air via heat exchanger, alternating duct columns

Manual or PLC-based automatic

How it works

The drying cycle

Load: wet paddy fills the top holding section of the column.
Heat: a furnace heats air through a heat exchanger; clean hot air is forced through the grain.
Recirculate: paddy passes through alternating hot-air and exhaust ducts, cycling until moisture is even.
Temper & discharge: grain rests to equalise internal moisture, then discharges at 13–14%.