When we crafted our first dryer, over 70 years ago, we simply needed a dryer that worked – we didn’t have time for anything less. We needed a dryer that was reliable, efficient and built with the understanding that capacity is king. So, we built one ourselves. As owner-operators of the same equipment you use we understand your daily struggles. We’re proud to offer a line of dryers with unmatched durability, performance and efficiency. We continue to craft the toughest, longest lasting dryers out there. For you, and for us. That’s Thompson tough and we’re sticking to it.

Get to know our line of Torrefiers. The proprietary design of the Konza Wapiti System offers wider feedstock choices, lower operational costs and the cleanest exhaust possible. With a high-yield production of 100,000-tonnes per year in a single unit (assuming a 50% starting moisture content Torrefied to 2.2% moisture content) the equipment is designed and fabricated to the same stringent criteria that’s resulted in Thompson systems running continuously for more than 60 years.


A Better Fuel

The Wapiti is the first step in being able to utilized renewable fuel sources on a large scale. Torrefied biomass has not been available at the quantities necessary for use in power plants until now. Thompson through its association with Konza Renewable Fuels is proud to offer the best torrefaction technology in the market.

Feature: Thompson’s proprietary design of rotary dryer internals (flights/lifters)

The rotary material handling internals allows for the largest variance of product sizes
Even drying across particle sizes

You have a wider source of feedstock to choose from without having to invest in sizing equipment
Consistent product quality you and your customers can count on

Feature: No refractory (except on biomass fired systems)

Quicker cool-down and start-up time for system
No stored energy in the refractory

Less downtime and less maintenance expense
Reduced risk of fires and explosions in shutdowns and upset conditions

Feature: Low oxygen drying environment

Fires need oxygen to burn, so low oxygen content means less risk of fires or high pressure events

Personnel and equipment are safer because fires and high pressure events are less likely.

Feature: Modulating exhaust gas recycle (also called flue gas recycle) – which reuses (recycles) hot gas from the system back into the front end of the drying process

Eliminates the need for make up air
Creates a consistent gas flow throughout the drying process
Allow drying process to use steam as the heat transfer medium
Use less fuel because there is no need to heat make up air
Reduces total gas volume entering and exiting the system (no make up air)
Either eliminates the need for, or reduces the size of secondary cleanup equipment (lower emissions)
Reduces the amount of oxygen entering the system (no make up air)
Increases consistency of final product quality
Allows for lower temperature drying which protects the quality of the end product

Lower fuel usage means lower operational costs
Lower emissions means lower capital investment
Lower emissions means happier neighbors
Consistent high quality products mean happy customers
Personnel and equipment are safer because fires and high pressure events are less likely

Feature: VFD controlled with limited use of dampers

Fewer dampers means less maintenance
Less pressure drop across system
Use only the horsepower needed

Lower operational costs
Lower maintenance costs
More reliable process controls

Feature: Inlet and outlet screws double as airlocks

Fewer pieces of equipment
Less complicated
Eliminates point for air (oxygen) to enter system
Lowers emissions

Lower operational costs
Fewer parts to break which means lower maintenance costs
Lower capital investment, no airlock here
Lower emissions means lower capital investment in secondary cleanup equipment
Lower emissions means happier neighbors
Personnel and equipment are safer because fires and high pressure events are less likely

Feature: Airlocks under each cyclone

Increased product separation from gas stream i.e. higher product retention
Eliminates point for air (oxygen) to enter system
Lower emissions

Higher revenues from having more product to sell
Lower emissions means lower capital investment in secondary cleanup equipment
Lower emissions means happier neighbors
Personnel and equipment are safer because fires and high pressure events are less likely

Feature: Negative pressure air system

Less dust (product) exiting the system at connection points, i.e. higher product retention
Drying gases stay in the dryer system or exit through the vent stack

Higher revenues from having more product to sell
Dangerous drying gases are not around plant personnel
Cleaner plant and surrounding area

Feature: Product doesn’t go through a fan

Less wear and tear on fan
Less cleaning

Lower maintenance costs
More uptime

Feature: Thompson’s patented steam purge and steam snuff (where steam is available)

Ability to know what gas is inside the system at startup
Ability to snuff out fires with hot steam instead of cold water

Reduced risks of fires or explosions on start up from build up of unexpected gasses
Ability to fight fires with less damage to equipment

Feature: Thompson’s over pressure venting system

Reusable over pressure doors release to reduce pressure in over pressure events

Protects personnel by giving the system the chance to discharge at a lower pressure level
Project equipment by giving the system the chance to discharge at a lower pressure level

Feature: Carbon Steel, Stainless Steel, or special alloy construction depending on feedstock

The proper materials of construction can handle the harmful natures of the feedstock such as corrosion or abrasion
Less wear and tear on the system

Lower maintenance cost
Longer life for system

Feature:  Automated Control System with Human Machine Interface (HMI)

Provides data from instruments at key points of the system for information and control purposes to run safer and more efficient
Handles startups and shutdowns automatically to remove human error
Alarms or controls upset conditions automatically
Automated fire suppression system (on some systems)

Protects personnel and equipment
Consistent product quality which means happy customers

Lowers cost of operation

Torrefiers At a Glance

Thompson offers two torrefaction systems to meet your needs; the 100,000-tonnes system, and the 50,000-tonnes system.

Performance Rates

Feedstock Capabilities such as:

  • Feedstock capabilities such as:
  • Woody biomass: hardwoods, softwoods, bark, slash, whole tree, sawdust, hog fuel, paper mill sludge, construction & demolition (C&D)
  • Non-woody biomass:
    • Grasses: elephant, switch, brome, miscanthus
    • Ag residuals: wheat straw, sugar beet pulp, potato waste, corn stover, bagasse, coffee bean
    • Municipal solid wastes (MSW)
    • Sanitary wastes: livestock, poultry


General Equipment Specifications

**The below specs are based on a 100,000-tonnes torrefaction system

Our torrefaction systems are made of stainless steel

Combustion & Burner Assembly
Natural gas burner (wet and dry solid fuel, fossil fuels, and other heat sources available)
Burner & combustion air fan tied into control system & automated sequences
Combustion systems meet or exceed NFPA 86 guidelines
Energy Recovery Center (EReC)

12-ft diameter x 55-ft long single pass dryer drum and torrefaction reactor
3/8-in thick shell
Internal flight/lifter support arms
Tires/tracks: 3-in thick x 10-in wide carbon steel
Trunnion wheels: 42-in diameter, 10.25-in wide with guards
Trunnion shaft: 8-in diameter thru wheel, steps down to 4-15/16-in
Self-adjusting pillow block bearings: 4-15/16-in
Drum drive assembly with VFD and guards

Separation and Clean-up
Outlet hoppers
Cyclones: 10-ga high efficiency
Clean-out doors in cyclone hoppers and outlet hopper
Compressed air inlets in cyclone hoppers
Combined outlet hoppers and cyclone particle separation from gas stream 99%+

Designed for use in dusty environments
AMCA standard 205 & 211 compliant and 210 & 300 tested
Fan application category BV-3 and balance quality grade G6.3
Shafts sized for 1.43x max rated speed-ANSI/AMCA 204-96
Heavy duty, self-aligning, pillow block type bearings with AFBMA l-50 > 200,000 hours
Clean-out door
Drive guard
VFD controlled where applicable

Double walled hot gas ducting
Sized for appropriate gas flow velocities
Bolt together sections for ease of assembly
Manways and cleanouts included for ease of access where applicable

Screw Conveyors
Conveyors: auger-style, AGMA class 3
Housing & auger with flanged covers
Shaft mount speed reducer
VFD controlled where applicable

Project Management
Installation Oversight
Operator Training
System Start-up
EPC Provides Turn-Key Solution

Emissions Control
Thermal Oxidizer integrated into the Energy Recovery Center (EReC)


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