KRF has two standard systems, both named after animals indigenous to the Kansas prairies: Woodchuck and Wapiti. The Woodchuck can process 6 tonnes per hour (over 34,000 tonnes per year). The Wapiti is the largest model and can produce an output of 12-tonnes* per hour (over 100,000 tonnes per year).
What can you achieve with a Konza torrefier?
Using the Wapiti’s capacity as an example, the Wapiti can produce torrefied biomass with a higher heating value (HHV) of approximately 22 GJ/MT (gigajoule per metric tonne) or 9,500 Btu/lb at a rate if 12 MT/hour or 26,500 lb/hour. The yearly output for a plant operating 8,400 hours per year is estimated to be 100,000 MT or 110,000 tons. Any number of organic crops or byproducts can be torrefied, giving future Wapiti owners a great number of options and freedom from industry specific shortages.
*Tonne projections based on lodgepole pine at 45% moisture content wet basis, depending on feedstock used and moisture content actual capacity may vary.
How does our Equipment Work?
The hot gases going from the Dryer Combustion Chamber to the Dryer Drum are a combination of 1) combustion gases, 2) torrefaction gases, and 3) reheated dryer gases. Green biomass enters the Dryer Drum from the System Infeed Hopper.
The product tumbles through the Dryer Drum, pushed along by the hot dryer gases. Most of the product is separated from the dryer gases by the Dryer Outlet Hopper. The dryer gases go to the Cyclone Bank where the remaining particles separate out of the gas stream. The product separated by the Outlet Hopper and Cyclone Bank are transferred to the Torrefaction Reactor by the Dry Biomass Conveyor.
The dryer gases exiting through the top of the Cyclone Bank are pushed through the Heat Exchanger Bank by the Heat Exchanger Fans and reheated. The reheated dryer gases are then split between the Energy Recovery Center EReC), Dryer Inlet, and Torrefaction Reactor Inlet.
The reheated dryer gases that enter the EReC are heated high enough to destroy the volatile organic compounds (VOCs) in the torrefaction gases. The hot, clean gases from the EReC provide heat to the Heat Exchanger Bank and then exit the system through the Stack.
Dry biomass and reheated dryer gases enter the Torrefaction Reactor. The product tumbles while being heated to a temperature that drives off about 30 percent of the dry solids and 10 percent of the energy. It becomes a coal-like substance that is roughly 9,500 Btu/lb. The product is separated out by the Torrefied Biomass Outfeed Screw.