Counterflow Cooler
High-Efficiency Pellet Cooler for Biomass & Feed Granules
Counterflow Cooler Overview
Our Counterflow Cooler (also called High-Efficiency Pellet Cooler) is a specialized granule cooling equipment designed for post-pelletizing cooling. It adopts a “hot granules downward, cold air upward” counterflow structure, efficiently reducing the temperature of biomass pellets, feed pellets, and organic fertilizer pellets from 70–90℃ to ≤3–5℃ above ambient temperature. With a cooling efficiency of ≥95% and pellet integrity rate of ≥98%, it avoids moisture regain and breakage—becoming a core supporting device for pellet mills in biomass energy, feed processing, and fertilizer production industries.
Technical Parameters of Counterflow Cooler
| Modle | Cooling volume (m3) | cooling time（min) | Capacity (t/h） | Matching power (kw) | Fan power (kw) | Suction volume (m3/min) |
|---|---|---|---|---|---|---|
| HXCC-1.5 | 1.5 | 6-10 | 3 | 0.75 | 0.35 | 34 |
| HXCC-2.5 | 2.5 | 6-10 | 5 | 0.75 | 0.55 | 34 |
| HXCC-4.0 | 4 | 6-10 | 10 | 1.5 | 0.5 | 34 |
| HXCC-6 | 6 | 6-10 | 15 | 1.5 | 0.5 | 34 |
| HXCC-8 | 8 | 6-10 | 20 | 1.5 | 0.55 | 34 |
| HXCC-10 | 10 | 6-10 | 25 | 1.5 | 0.55 | 34 |
| HXCC-12 | 12 | 6-10 | 30 | 1.5 | 0.75 | 34 |
Core Components of Counterflow Cooler
The stable cooling performance relies on 5 specialized components, optimized for counterflow heat exchange and pellet protection:
Made of 304 stainless steel or carbon steel (anti-corrosion coating), it features a multi-layer baffle structure. This design guides hot granules to flow evenly downward, while cold air is forced upward—maximizing heat exchange contact area and avoiding local overcooling/undercooling.
Equipped with a variable-frequency centrifugal fan and uniform air distribution plate. Cold air is blown from the bottom of the chamber, passing through the granule layer upward, while hot granules fall by gravity—forming efficient counterflow heat exchange that reduces cooling time by 30% vs. cross-flow coolers.
Internal spiral guide plates and buffer layers slow the falling speed of granules (0.5–1m/s), extending heat exchange time to 8–15 minutes. This ensures deep cooling of granules and prevents breakage from rapid impact.
Adopts a double-layer star discharger with speed regulation, matching the output of pellet mills. It realizes continuous, sealed discharging—avoiding air backflow and ensuring stable cooling efficiency without manual intervention.
A built-in cyclone dust collector captures 98% of cooling dust, with optional pulse bag filter for emissions ≤10mg/m³. The fan is equipped with a noise reduction cover (≤75dB), meeting workshop environmental standards.
Working Principle of Counterflow Cooler
The Counterflow Cooler operates through a streamlined 4-step process, leveraging counterflow heat exchange for efficient cooling:
- Granule Feeding: Hot granules (70–90℃) from pellet mills are evenly fed into the sealed cooling chamber via a conveyor, guided by the top baffle to spread uniformly.
- Counterflow Heat Exchange: The centrifugal fan blows cold ambient air upward from the chamber bottom, while hot granules fall slowly downward. The opposite flow direction creates full heat exchange—cold air absorbs granule heat and is discharged as hot air, while granules gradually cool.
- Temperature Control: A temperature sensor at the discharge port monitors granule temperature in real time. If the temperature exceeds the set value (3–5℃ above ambient), the system increases fan speed; if too low, it reduces speed—ensuring stable cooling effect.
- Discharging & Dust Removal: Cooled granules (≤3–5℃ above ambient) are discharged continuously by the star discharger for packaging. Simultaneously, the dust collector captures fine particles generated during cooling, keeping the workshop clean.
Core Advantages and Features
Why choose our counterflow cooler?
Counterflow structure achieves ≥95% cooling efficiency, reducing granules from 80℃ to ambient +4℃ in 10 minutes—30% faster than traditional cross-flow coolers.
Slow falling speed and soft baffle design maintain ≥98% pellet integrity, avoiding breakage and dust generation—reducing material waste by 5–8%.
Variable-frequency fan adjusts air volume based on granule temperature, saving 20–30% energy vs. fixed-speed models. No additional cooling medium (e.g., water) is needed, lowering operating costs.
Suitable for various granules (biomass pellets, feed pellets, organic fertilizer pellets) with diameters 2–12mm. Adjusts air volume and cooling time to fit different granule densities and moisture contents.
Main Application Scenarios
1. Biomass Pellet Production
Cools wood pellets, rice husk pellets, and palm kernel shell pellets after pelletizing—preventing moisture regain and ensuring storage stability.
2. Feed Production Industry
Cools compound feed pellets, aquatic feed pellets, and premix pellets—maintaining nutritional components and avoiding mold growth.
3. Organic Fertilizer Production
Cools granular organic fertilizer (animal manure, crop residue-based) to room temperature, facilitating packaging and transportation without caking.
4. Grain Processing
Cools granular cereal products (soybean meal pellets, corn pellets) to preserve quality during long-term storage.
Customer Site Footage
Hot Market Counterflow Cooler for Sale
- Southeast Asia (Indonesia, Thailand): High demand for 5–15t/h models to match local biomass pellet production lines, driven by abundant agricultural waste resources.
- Europe (Germany, Poland): Prefers 10–20t/h automatic models with PLC control, meeting strict environmental and production efficiency requirements for feed and biomass industries.
- North America (USA, Canada): Agricultural regions use 3–10t/h compact models for small-to-medium feed and biomass pellet workshops.
Counterflow Cooler Application Cases
Chinese Biomass Pellet Plant
Deployed a 12t/h Counterflow Cooler to cool wood pellets (85℃ → ambient +3℃). The pellet integrity rate reached 99%, reducing waste by 6% and saving $12,000 annually in energy costs.
Thai Feed Factory
Used an 8t/h automatic model to cool aquatic feed pellets. Cooling time was shortened to 12 minutes, and feed nutritional loss was reduced by 3%—meeting export quality standards for Southeast Asian markets.
German Organic Fertilizer Plant
Adopted a 15t/h cooler with pulse dust collector. It cools manure-based pellets to ambient +4℃, with emissions ≤8mg/m³—complying with EU environmental regulations and improving production efficiency by 25%.
FAQ about Counterflow Coolers
Counterflow coolers use opposite air-granule flow for deeper heat exchange (higher efficiency, more uniform cooling); cross-flow coolers have parallel flow (lower energy consumption but uneven cooling). Counterflow is ideal for high-quality pellet production.
Yes. It adapts to 2–12mm granules by adjusting air volume and cooling time—no need to replace core components.
The slow-falling guide device and buffer layers minimize impact. Additionally, adjusting the discharger speed to match granule falling speed prevents extrusion and breakage.
Small workshops (≤5t/h) can use manual control; medium-to-large production lines (≥6t/h) benefit from PLC control—realizing automatic temperature adjustment and seamless integration with pellet mills.
Weekly: Clean the air distribution plate and dust collector; Monthly: Lubricate the fan and discharger bearings; Quarterly: Check the baffle and guide plate for wear. With proper maintenance, service life is 8–10 years.
The output varies significantly between models. Standard models can handle 2 to 10 tons/hour, while customized models can handle up to 50 tons/hour.
This is often caused by excessive air volume, resulting in a short cooling time and insufficient moisture removal. Reduce the air intake and appropriately extend the cooling time to balance the air volume and cooling cycle.
Select a cooler with capacity 10–20% higher than the pellet mill’s output to avoid bottlenecks. For example, a 10t/h pellet mill requires an 11–12t/h cooler.
Buyer's Guide
How to Buy the Best Pellet cooler？
Choose a cooler with 10–20% higher capacity than your pellet mill to ensure smooth continuous production.
For corrosive materials (organic fertilizer), choose 304 stainless steel; for general biomass/feed pellets, carbon steel with anti-corrosion coating is cost-effective.
Opt for variable-frequency fans to save energy; medium-to-large lines should select PLC control for automatic temperature adjustment and integration with production lines.
Ensure the dust collector meets local emission standards (e.g., ≤10mg/m³ for EU, ≤30mg/m³ for China). Optional pulse bag filters are recommended for strict regions.
Choose coolers with reputable brand fans, reducers, and sensors to ensure stable operation and reduce maintenance costs.
Partner with manufacturers with 5+ years in cooling equipment, offering on-site installation, training, and global spare parts delivery (7–15 days).
Get Your Customized Counterflow Cooler Solution
With 10 years of experience manufacturing Counterflow Cooler and Pellet Cooler, we understand the needs of biomass, feed, and fertilizer industries for efficient, stable cooling. Whether you need a small manual model or a large automatic PLC-controlled system, we’ll tailor it to your production scale, granule type, and workshop space.
Contact us today to get:
- Free capacity matching calculation (share your pellet mill output and granule specifications).
- Industry-specific operation videos (e.g., biomass pellet cooling, feed cooling).
- Transparent quote (no hidden fees—includes cooler, dust collector, installation, and training).
We don’t just sell cooling equipment—we help you improve pellet quality, reduce waste, and optimize production line efficiency. Let’s get your cooling solution started!