Perry Biomass Engineering

Belt Drier

Perry Belt Drier Logo

"One machine can dry it all"

The Perry Belt Drier is ideally suited to drying almost any non-flowing product or more granular products that require a lower throughput capacity. Popular applications have included biomass, anaerobic digestate, grass & seeds.

The Perry Belt Drier can be adjoined to a variety of in house manufactured handling equipment to feed and discharge the driers, including: store conveyors, belt and bucket elevators, augers and screw conveyors, in addition to many more handling solutions.

Product Sample Wheel

The Perry Belt Drier is ideally suited for these materials:

Wood chip - Wood shavings - Wood pellets - Other feed pellets - Saw dust - Biomass straw - Miscanthus and bagasse - Herbs - Combinable crops - Beans and soya beans - Shredded recycled matter - Sewerage sludge & digestate - Flaked maize - Nuts - Fruit and fruit slices - Compost - Cotton rejects - Extruded pet foods - Finely ground wet chips - Grass - Grass seed - Orange peel - Pulp granulates - Solid shredded waste - Granular & shredded plastic - Poultry manure.

Traditionally drying these types of materials has been achieved by rotary drum driers, however this method has many disadvantages, including:


    • High risk of fire due to the average operating temperature of 426°C (800°F).
    • Balling up of products.
  • Potentially volatile emissions which may require additional permits.
  • Not suited for heat recovery due to their higher operating temperature.

The Perry belt drier overcomes all of the issues listed above, along with being more economically efficient due to the lower operating temperature and providing the opportunity to recover waste heat.

Drying for Biomass:

It’s highly likely that your biomass materials need to have their water content reduced before you can use them, to:

  • Ensure the optimal heating efficiency of the material, including a greater flame temperature.
  • Prevent incomplete combustion of the fuel leading to tar & creosote emissions.
  • Prevent corrosion of the flue by water recondensing.
  • Improve the efficiency of the transport & storage of the material.

Key Points

 Belt Drier - universal belt Fitted with a universal belt, the Perry belt drier is suitable for all granular products, woodchip, shavings, sawdust, paper pulp, grass, herbs, vegetable slices, SRF, RDF, silica granules, sand, clay pellets and grain. This belt is tightly woven so very few product fines will pass through.
 Belt Drier - Product The air enters the top of the drier and is drawn down through the product and the belt. This makes our drier ieally suited for drying light crops as they are not blown off the bed by the air flow; they are consolidated onto it. This means more air gets through the product and allows for maximum drying efficiency. It is particularly good for sawdust, herbs and grasses.
 Belt Drier - No chains or slats The Perry belt drier does not have chains or slats; keeping it very clean. In driers with slats & chains, when products such as grass or herbs are being dried the residue left will decompose and the bacterial count inside the drier will increase. In the Perry belt drier there is less chance of damage as materials cannot get stuck in the slats & chains. As the product is fed onto the belt and is stationary during the drying process the Perry belt drier is very gentle to the product; there will be no damage caused by it being dragged through the drier over a metal bed by chains and slats.
 Belt Drier - Galvanised modular construction

Slow moving, and very few moving parts, so rates of wear are very slow and cheap to maintain.

Galvanised modular construction. 2m long standard sections. Drive, tail and tensioning section are sent to site pre built. The rest of the sections are sent to site in panel form. The drier can be extended after purchase at a later date very easily. This makes it easier to plan for the future and extending the drier instead of having to add another drier. Also the galvanised construction is well suited to resisting corrosion caused by the damp air when drying.

 Belt Drier - Rotary Brush

Because there is no louvre system or mesh material that the product is being moved over there are no air gaps to become clogged by small residue so the drier performance stays consistent all of the time and there is no perforations to clean in the drier body.

There is a rotary brush to clean the belt as standard and for usual biomass and granular products this should be satisfactory. Becasue we are cleaning the belt every piece of the belt is cleaned once per revolution automatically.

 Belt Drier - Air knife Other cleaning options can be an air knife which can blow small particles out of the belt or for clearing sticky residue from the belt a high pressure jet water cleaning system to clean the return belt after the drive drum.
 Belt Drier - Control Panel The control panel is a touch screen PLC. This can have remote connection via the internet and there is an App which can be used on a mobile phone.
 Belt Drier - PLC The PLC screen is full colour, and has an SD card that logs data which can be plugged into a laptop and downloaded - or, if there is an internet connection with a fixed IP address, can be downloaded from our UK office for diagnostic purposes.
 Belt Drier - Seal

Automatic control as standard is by measuring air temperature on the same principle as the grain drier. The way this works is to measure the air temperature above and below the belt at the inlet and outlet of the drier. When the temperature below the belt drops at the inlet this indictaes damper product entering the drier. The PLC will then slow the belt down to compensate. If the temperature below the belt at the outlet end increases this will indicate that the product is getting over dried; so the PLC speed the belt back up. An extra cost alternative will be a system using microwave moisture sensors to actually measure the moisture and control the speed from these readings. With the moisture sensors the actual moisture is measured but the PLC program makes the adjustments in the same way.

Sealing for product leakage and air leakage is done using a soft rubber side skirt. This is adjustable as it wears to help maintain and efficient seal and is a slow wearing part.

 Belt Drier - Belt tracking device We have an automatic belt tracking device which works using a sensor at the side of the belt to sense if the belt wanders to one side. If the sensor is touched then an electric actuator changes the angle of the tracking rolle which sends the belt across to the opposite side.
 Belt Drier - Large Scale For large scale applications enclonsing the drier in a Kingspan composite panel structure is a good alternative. This means that the main galvanised body is completely covered by the insulated panels apart from the drive and tail end of the drier. This means the HEX can easily be mounted on the vertical side of the structure and the fans can be either mounted on the roof or top of the vertical side of the cold plenum. The drier can be made to blend in with it's surroundings. It is more expensive than standard galvanised finish. Everything you see in the brochure we design and manufacture in house, in our UK based factory.
 Belt Drier - Optional cooling section

Optional cooling section.

 Belt Drier - Agitators For products that can be mixed during the drying operation we have roatry agitators positioned along the drier.
 Belt Drier - Mobile option For smaller applications there is a mobile option.
Belt Drier Fuel Options

General Design

Modular galvanised steel construction available in 1.5m, 2.2m and 3m widths. The drier can be increased in length in 1m increments from 8.5m to 38.5m (including drive and tail). The overal height of the drier is dependant on the heat source chosen.

Heat Sources Available

These are commonly used for application where a biomass heat source is available such as woodchip boilers to produce hot water or if there is a steam heat source available.
The drier can be tailored to accept a customer’s existing heat exchangers if required.

If a separate heat source is required a direct fired furnace with diesel, kerosene, LPG or natural gas burner can be used. Alternatively a heat exchanger with the same burner can be used for indirect heating if required.

Belt Drier Belt Section

Belt Information

Polymer Woven Belt

  • An anti-static synthetic/bronze weave mesh which is well suited to low temperature driers. Temperatures of up to 130°C.
  • Best suited for smaller/finer products, or products which have a wide range of particle sizes such as woodchip.
  • The woven in bronze wires permanently prevent electro-static charging of the belt. 
  • The mesh has a high level of air permeability. 
  • Two Separate tracking rollers & two rotary cleaning brushes (one at the drive end & one at the tail end).

Perry Belt DrierOptions

  • Feeding hopper that can be used as a buffer hopper to help feed the product evenly over the belt. This feeding hopper will have a number of screw feeders dependent on the width of drier chosen. The hopper can be fed via dump loading, elevators, conveyors or screw conveyors.
  • Drier panels can be insulated along the drying section to improve heat retention.
  • A false floor option is available for a fully enclosed drier base. 
  • Perry Belt DrierA complete enclosure can be built around the drier to house the heat exchangers and the fans. This is built with insulated wall panels and two access doors (one in the hot & one in the cold plenum).

PLC Control Panel

The Perry PLC Control Panel is unique in that it shows you an on-screen mimic of your drier making it one of the most Perry Belt Drier Control Panelsimple control panels available on the market.

With our new App available in iTunes & Google Play, you can operate your drier from anywhere you get a signal, meaning you don't have to keep watch of, you can also get email and text alerts & updates sent straight to your phone just to reassure you that everything is ok! (Requires panel to be connected to the internet)  
  • 12” Touch screen.
  • Simple operation.
  • Plain English status alerts.
  • Designed & programmed in house.
  • Data logging of all readouts and alarms and drier status.
  • Perry Belt DrierMoisture contents can be entered during the day.
  • Export all recorded drier conditions and moisture contents to a spreadsheet and automatically create daily record sheets. 
  • Fuel use calculator included for diesel applications.

The drier history is recorded and input & output screens display current panel conditions to aid fault diagnostics.

Perry Belt Drier

Internet Connectivity
Connect your panel to the internet to allow:

  • Status reports can be sent to select mobile numbers and email addresses.
  • Ability to control or monitor the drier remotely from any internet connected PC or tablet.
  • Download all drier history and data logged records.
  • Allows remote connection by Perry engineers to diagnose any faults or to control the drier.

For more information on the Perry Belt Drier or any of our other products and services call us now on

+44 (0)1404 890300 or email

 Perry Belt Drier