Post-Harvest Drying

Lower moisture · prevent loss · preserve grain quality

The Problem

Grain is harvested at up to 18–30% moisture, but safe storage requires 13–14%. If not dried within 24–48 hours, molds multiply extremely fast in heat and humidity, and aflatoxin above limits renders the entire batch commercially worthless — in some countries even meeting the threshold for mandatory destruction. For large-scale growers and storage enterprises, such loss can be catastrophic.

Comparison of three drying solutions

Tower drying

22–500 TPD continuous
For large collection centers
PLC automatic operation
24-hour continuous running

Batch drying

3–25 t/batch
Fixed and mobile types
For small/medium farms
Low investment cost
Easy operation

Seed drying

Low temp ≤40°C
High-volume gentle drying
Ensure germination ≥95%
For seed companies & breeding stations

Drying process flow

Post-Harvest Drying Process

Wet grain infeedMoisture 18–30%

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CleaningRemove straw/stones

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Hot-air dryingStaged temp. control ★ core

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Tempering & coolingEven moisture / cool down

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Silo storageMoisture 13–14%

Fuel selection guide

Fuel	Unit heat cost	Suitable for	Eco-friendliness	Temp. control
Coal	★☆☆ Lowest	Abundant coal	Carbon-neutral	High
Diesel / Natural gas	★★★ Medium-High	Gas pipeline areas	Cleaner	High
Biomass pellets	★☆☆ Lowest	Agri-waste rich areas	Carbon-neutral	High
Electric	★★★ Medium-High	Abundant power, strict eco rules	Zero emission	High

Tell us your crop and expected capacity

Our engineers will recommend the most suitable drying solution and model for free.

Frequently Asked Questions

Why must harvested grain be dried as soon as possible?

Grain is harvested at 18-30% moisture but safe storage needs 13-14%. If not dried within 24-48 hours, molds multiply fast in heat and humidity and aflatoxin above limits can make the whole batch worthless - in some countries even forcing mandatory destruction. For large growers and storage enterprises such loss can be catastrophic.

How to choose between tower, batch and seed drying?

Tower dryers 22-500 TPD run continuously, suited to large collection centers with PLC auto 24/7 operation. Batch dryers 3-25 t/batch (fixed and mobile) suit small/medium farms with low investment and easy operation. Seed dryers use <=40C low-temperature high-volume drying to keep germination >=95%, for seed companies and breeding stations.

Which heat source is most economical?

Where coal is abundant use coal (lowest unit heat cost); where natural gas pipelines exist use gas (cleaner); where agricultural waste is rich use biomass pellets (self-produced waste, lowest cost and carbon-neutral); where power is abundant with strict eco rules use electric (zero emission). We recommend by local fuel availability and compliance.