Coffee drying systems in Guinea
What the crop demands, what the country imposes, and what that means for capacity.
Guinean robusta comes out of Guinée Forestière, a region with genuinely good growing conditions and almost no post-harvest infrastructure. The crop is dried on the ground in a zone that receives heavy rainfall, and the resulting defect rates keep it in the lowest bulk grades regardless of the quality of the cherry.
The situation in Guinea
The wettest country in West Africa, and that governs everything. Conakry receives over three metres of rain a year, much of it in four months, and sun-drying during that window is not difficult so much as impossible. Guinea therefore has the region’s strongest case for controlled drying and the least of it installed — the crops are there, the harvest coincides with the rains, and there is no fallback.
Growing regions. Guinée Forestière in the south-east, Basse-Guinée around Conakry, Fouta Djallon in the middle
What coffee drying demands
Coffee is dried in parchment or as whole cherry, and either way the target is a slow, even descent to 10–12 %. Uneven drying is what produces the faded, stinker and mouldy defects that get a lot rejected at the cupping table, and a lot is graded on its worst beans rather than its average.
Harvest calendar
November to February. The dry season is shorter and less reliable in the forest region than further north, so the drying window is genuinely tight.
The working campaign window as the trade runs it. It shifts a fortnight either way with the rains.
Process parameters
| Parameter | Value |
|---|---|
| Drying temperature | 45–55 °C |
| Final moisture | 10–12 % |
| Yield (fresh : dried) | 5 : 1 |
| Cycle time | 18–30 h |
Sizing starting points from ordinary processing practice, not a validated recipe for your product. Confirm against your own intake and your buyer’s specification.
Worked sizing example
For a unit taking 6 tonnes of fresh product a day, at a yield of 5 : 1:
Illustrative figures calculated from the yield and campaign window above. They size a conversation; they do not describe any existing installation.
Fuel available in Guinea
Forest Guinea: oil palm and coffee. Rice husk is the country’s most widespread residue, and also its ashiest.
- Base load. Palm kernel shell · Rice husk · Palm fibre (mesocarp)
- Supplement. Coffee husk and parchment · Cashew shell · Sawdust
See all 27 fuels and their properties
Market and buyer requirements
Bulk robusta export for soluble manufacture, with a quality upgrade available if defect rates can be brought down — Guinée Forestière’s underlying cup quality is better than its grades suggest.
Explore further
The systems that hold this profile
Other crops in Guinea
Mango · Palm kernel · Fonio · Fish
Coffee drying elsewhere
Frequently asked questions
Why does Guinean coffee grade low?
On defects rather than on the cherry. Ground drying in a high-rainfall zone produces faded, stinker and mouldy beans before the lot ever reaches 10–12 % moisture, and a lot grades on its worst beans — so the underlying cup quality never reaches the buyer’s assessment at all.
How tight is the drying window in Guinée Forestière?
Tighter than further north. The dry season is shorter and less reliable in the forest region, so the November-to-February window can close early and leave a crop part-dried. A chamber holding 45–55 °C over an 18 to 30 hour cycle removes the dependency on the weather entirely.
What does 6 t/day of cherry produce?
About 1.2 tonnes a day of dried coffee at roughly 5 : 1, over an 18 to 30 hour cycle at 45–55 °C. That is a cooperative-scale operation, and it is the level at which reducing defect counts translates into a grade change worth what the equipment costs.
Size a unit in Guinea
Tell us your daily fresh volume and target output, and we will size the chambers, the burner and the fuel available around your site.
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