Dryers
High-capacity thermal drying of bulk products.
Technologies
Drying, Cooling & Calcination
Rotary drums and thermal equipment for large-scale solids processing, designed around each product and each process.
Technology
Specialists in rotary drums and fluidised beds
The rotary drum has been an industrial machine since the early twentieth century. Simple in concept, it processes solids or sludges through the tumbling action of rotation and the curtains of material formed by its flights.
At COMSPAIN we design, manufacture and maintain rotary drums and fluidised beds matched to the demands of each process. We cover the full cycle: basic and detail engineering, manufacture, erection, commissioning and after-sales service.
Range
A complete family of equipment
Coolers
Controlled cooling of the product after drying or reaction.
Granulators
Granule formation, with particular experience in fertilizers.
Calciners
High-temperature thermal processing.
Coaters
Uniform coating of the product.
Scrubbers
Scrubbing of gases and products for cleaning and process recovery.
We also build: classifiers, demoulders and slakers.
Engineering
Engineering in every detail
The drums can run with gas and product flows co-current or counter-current, with direct or indirect heating as the process requires. The internals are designed around the rheology of each product to maximise heat and mass transfer, spread the product evenly and reach maximum fill without causing agglomeration.
Drive systems
- Pinion and girth gear
- Chain drive with sprocket
- Friction drive through the trunnion rollers
Standard equipment
- Drive and riding gear frames
- Product inlet and outlet boxes
- Gas take-offs
- Special features: a squirrel cage at the outlet, anti-build-up hammers on the drum shell, or water spray systems
Advanced engineering
Special technologies
Every process has its own solution. We build specific configurations:
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Honeycomb flights
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Heat transfer through the wall: water spray (coolers) or heaters — electric or burner-fired — for drying and calcination
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Combined dryer-coolers with a central air outlet
Industries
Applications
We process fine, crystalline, coarse and plastic bulk products, and even sludges, with particular experience in fertilizers:
- Granulated and crystallised fertilizers (NPK, nitrates and others)
- Phosphates, including dicalcium phosphate (DCP)
- Salts and chemical products
- Minerals
- Biomass and solids from the agri-food industry
- Wastes and sludges
Capacity
Large equipment for plants worldwide
A few examples of equipment built and in service:
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Solid stainless steel drums for ammonium nitrate, 50 mm thick
Ø4.5 m × 30 m · Spain
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Indirect PVC dryers
Ø3.2 m × 28 m · Canada
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NPK drying drums
Ø4 m × 28 m · South Africa
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NPK granulators
Indonesia
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Solid waste drying plants for an incinerator
Spain
Materials: carbon steel, stainless steel or special alloys, depending on how corrosive the process is.
Projects
Projects using this technology
Manufacture, transport and installation · Fertilizers · Georgia
Rotary dryer drum delivered and installed on site
Manufactured at COMSPAIN's works, moved by special low-loader for the oversized load, then lifted and positioned at the client's plant with heavy-lift cranes. The whole…
Revamping & Retrofit · Fertilizers · Spain
On-site girth gear crack repair, equipment back in service in 3 days
A 260 mm transverse crack in a dryer girth gear — 12.5 tonnes, 35CrMo4 cast steel, in continuous operation since 1987. Replacing it would have meant months of lead time…
Manufacturing & Supply · Fertilizers · Georgia
Fluidised bed cooler for efficient product cooling
Manufactured at our works in Spain and installed on site, a fluidised bed cooler covers one of the most critical stages in fertilizer production: cooling the product…
Manufacturing & Supply · Fertilizers · Georgia
Coater drum for uniform granule coating
Manufactured at our works in Spain and installed on site, a coater drum for a fertilizer producer. Designed to apply a consistent, even coating across the whole product…
Manufacturing & Supply · Fertilizers (phosphates) · Morocco
Two rotary dryer shells for a dicalcium phosphate (DCP) plant
Manufacture of two large rotary dryer shells for a dicalcium phosphate (DCP) plant. From steel plate to fully welded, inspected and protected drum sections: each shell…
Technical Assistance · Fertilizers · France
On-site welding and technical assistance on a fluidised bed cooler
Specialist welding support and technical assistance for repair work on a fluidised bed cooler, working inside the equipment to return it to full operating condition. You…
Revamping & Retrofit · Fertilizers · Egypt
In-situ riding ring grinding and repair, without dismantling the drum
When a riding ring shows wear, pitting or surface damage, replacing the whole drum is rarely the answer. COMSPAIN's field service team carries out in-situ riding ring…
Technical Assistance · Fertilizers · France
On-site repair and refurbishment of a vibrating fluidised bed dryer
After years of service in a demanding process, a vibrating fluidised bed dryer had developed cracks in structural areas and deteriorated sheet metal sections that…
Manufacture and export logistics · Fertilizers · Saudi Arabia
Dryer drums split into two halves for transport
Supply of dryer drums for a diammonium phosphate (DAP) plant in Saudi Arabia. Given their size, the drums were designed to be split into two halves, making heavy-lift…
Manufacturing & Supply · Fertilizers · Spain
Vibrating fluid bed on leaf springs for organo-mineral fertilizers
DL-type vibrating fluid bed for an organo-mineral fertilizer plant in Spain, shown in our workshop before delivery. Designed for large bed surfaces, the DL design…
Revamping & Retrofit · Fertilizers · Belgium
New granulator drum for an NPK plant revamp
As part of a granulation line revamping project for an NPK fertilizer plant in Belgium, COMSPAIN engineered and manufactured a new granulator drum in its workshop,…
Have a drying, cooling or calcination project?
Tell us what you need and our engineering team will recommend the best technical solution.