A counterflow dryer is an innovative piece of equipment used in the oil and fat industry due to its high energy efficiency and ability to ensure uniform dehydration of sunflower, soybean, rapeseed, and other oilseeds. Due to the vertical gravitational flow and counterflow hot air supply scheme, it ensures high uniformity of dehydration, energy savings, and compactness, making it the preferred choice over horizontal or typical dryers.
The product moves downward under gravity, eliminating horizontal surfaces in the dryer’s design. This gravity flow feature minimizes the risk of dust accumulation and cross-contamination between batches. The absence of unnecessary mechanisms in the drying zone significantly reduces maintenance needs, ensuring a clean process, enhanced food safety, and lower operational costs.
— based on the vertical gravity flow design, eliminating horizontal surfaces and minimizing cross-contamination and dust build-up
All contact parts that interact with the product and hot air are made of high-quality stainless steel. This prevents corrosion, extends equipment lifespan, and ensures hygienic processing. It’s notable that Geelen dryers installed since the 1980s still operate without major overhauls. The use of stainless steel supports circular economy principles, being highly recyclable
These dryers can operate in both continuous flow mode—where product moves steadily through 1–2 drying decks with evaporation capacity up to 750 L/h—and batch flow (semi-continuous) mode with 5–15 modular drying decks and up to 7 temperature zones. This flexibility enables rapid switching between raw materials, precise control of drying intensity, and reduced downtime for reconfiguration
Counterflow dryers support multiple heat inputs—gas burners (natural gas, propane, butane, biomethane, hydrogen), steam heat exchangers, hot water, and heat pumps. Integrating heat pumps allows for thermal energy savings of 60–75% compared to conventional systems. When paired with green electricity, the system can become fully carbon-neutral, aligning with modern decarbonization goals
To ensure a consistent product layer, batch models use a PLC-controlled belt distributor, while continuous models employ an adjustable rotating distributor with rakes. These systems prevent irregular bed thickness, ensuring uniform drying and dehydration across the entire product mass. A dosing valve at the outlet prevents infiltration of external air and maintains a steady feed into downstream operations
The counterflow dryer is a vertical, sectional design equipped with thermal insulation, air supply and exhaust systems, distribution mechanisms, and discharge valves. Its modular construction allows adaptation to different raw material volumes and product specifications, including sunflower seed, soybean, rapeseed, and other oilseeds.
Raw material is loaded into the top section of the dryer and gradually moves downward through several drying decks under the influence of gravity. At the same time, hot air is introduced from the bottom of the unit, moving in the opposite direction to the product flow. This counterflow mode ensures intensive heat transfer, uniform moisture removal, and prevents overheating of the product while preserving its nutritional and technological properties.
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Quiplines LLC is your reliable partner specializing in the supply of production equipment and spare parts, the provision of services, and technical support for enterprises at all stages of project implementation.
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