F&P · Drying systems
Industrial drying systems
Seven dryer types, sized up to 480 m². Selection is decided by heat sensitivity, feed form and the particle you need at the other end.
Overview
Overview
Glorinda supplies a wide range of industrial dryers and drying systems, including large-scale units with sizes up to 480 m². Our solutions are suitable for various industrial applications and are designed for energy efficiency and long-term performance.
Drying is where a great deal of a plant's energy goes and where a great deal of product quality is decided. Choosing the wrong dryer produces a product that is technically dry and commercially wrong: degraded by heat, the wrong particle size, poor flow characteristics, or dried at a cost per tonne that the product cannot carry.
Because drying is also a stage in our zero liquid discharge and sludge management work, we approach it as a process step rather than as a machine purchase — the upstream dewatering or crystallisation stage usually has more influence on drying cost than the dryer itself.
Detail
The seven dryer types
Atomise a liquid feed into a hot gas stream, producing a free-flowing powder in a single step. The route for milk powder, instant products, enzymes and many pharmaceutical intermediates, where the product must go from liquid to powder without an intermediate solids-handling stage.
Suspend particles in an upward gas flow, giving uniform temperature and gentle, even drying. Widely used where heat sensitivity matters and where granulation, agglomeration or coating can be combined with the drying step.
A rotating drum lifting and cascading the material through the drying gas. Robust, tolerant of variable feed and particle size, and the usual answer for bulk materials where gentleness is not the constraint.
A thin film of feed applied to a heated rotating drum and scraped off as a dried sheet or flake. Efficient for viscous pastes and slurries, and used where a flaked product is wanted.
Very short residence time in a hot gas stream — the material is dried in seconds while it is conveyed. Suited to heat-sensitive fine materials where prolonged exposure would degrade the product.
Indirect drying by heated paddles and a heated jacket, with no drying gas in contact with the product. Used for pastes, sludges and materials where the exhaust gas volume has to be minimised — including sludge drying.
Indirect drying via steam-heated tubes inside a rotating shell. Energy efficient where steam is available, and used in zero liquid discharge lines as the steam tube bundle rotary dryer.
Detail
Selecting a dryer
Four questions
- What is the feed? A pumpable liquid, a paste, a filter cake or a free-flowing solid — each rules out several options immediately.
- How heat-sensitive is the product? Short residence time and gentle temperature profiles come at a cost; if the product does not need them, do not pay for them.
- What particle do you need? Powder, granule, flake or lump. The dryer often determines this more than any downstream step.
- What energy is available? Steam, gas, electricity or recoverable waste heat. Indirect dryers using available steam behave very differently commercially from direct-fired ones.
Upstream matters more than people expect
Every percentage point of moisture removed mechanically before the dryer is energy you do not spend thermally. On a sludge line that means the dewatering stage; on a ZLD line it means the crystalliser and centrifuge, which reduce moisture content significantly and minimise the need for additional dryers.
We look at the whole line before recommending a dryer, because the cheapest way to reduce drying cost is usually not to buy a better dryer.
Applications
Applications and challenges
Where it applies
- Food powders, dairy products and instant products
- Pharmaceutical intermediates and active ingredients
- Enzymes and biotechnology products
- Chemical and petrochemical intermediates
- Sludge drying at municipal and industrial treatment plants
- Zero liquid discharge solid output drying
- Mineral and bulk material drying
- Agricultural and agro-processing products
Common challenges we are asked to solve
- Product degrading thermally in the current dryer
- Particle size or flow characteristics off specification
- Energy cost per tonne of product too high
- Dust emission and workplace exposure from the drying area
- Dryer capacity limiting the whole production line
- A dryer specified before the upstream dewatering was optimised
FAQ
Frequently asked questions
How large are the dryers you supply?
Up to 480 m². The full range covers paddle, fluid bed, drum, rotary, flash, steam tube and spray dryers, designed for energy efficiency and long-term performance.
Which dryer is right for a heat-sensitive product?
Usually spray or flash drying, because both have very short residence times, or fluid bed drying where the gentle, uniform temperature profile matters more than speed. The right answer depends on whether the feed is a liquid, a paste or a solid.
Can you reduce our drying energy cost?
Often, and frequently without changing the dryer. Improving mechanical dewatering upstream, recovering exhaust heat, and matching the dryer to the actual product specification rather than a conservative one are the three usual routes.
Do you supply dryers for sludge and ZLD as well?
Yes. Sludge drying uses mechanical and thermal methods, and ZLD lines use scraped surface dryers, agitated thin-film dryers (ATFD), steam tube bundle rotary dryers, spray dryers and fluidised bed dryers depending on operating conditions and the required output moisture.
Evidence
Projects
Sample layout. Reference projects are being cleared for publication with the clients concerned. The structure below is final; the content is placeholder.
SampleWater reuse retrofit — sample card
Card layout for a completed water reuse project: stream data before and after, recovery achieved, scope Glorinda held, and the client's own words.
SampleZLD package — sample card
Card layout for a zero liquid discharge package: feed characterisation, evaporator type selected, solid output route, and commissioning duration.
SampleOwner's engineer mandate — sample card
Card layout for an advisory mandate: the client's decision, the options assessed, and what changed in the tender as a result.
Conversion
Take this further
Send us the stream data, the discharge limit or the equipment list you are working from. An engineer reads every enquiry and replies with the questions that actually decide the solution — not a brochure.
Contact
Talk it through with an engineer
Send the constraint you are designing around and we will tell you what is realistic before anyone writes a specification.