In bioethanol plants, the concept works as a pre-treatment process. This makes the handling and introduction of biogas into the ethanol plants fairly simple while still reducing investments and costs in other parts of the ethanol plant.
There are multiple benefits of the waste to fuel technology.
The mechanical pre-treatment and high pressure of the briquetting machine press creates small steam explosions. This changes the structure of the straw, enabling it to absorb 7-10 times more than normal straw. In the process, the cell structure is opened by a small steam explosion. This gives free passage for bacteria and eases dispersion of the straw briquettes in biofuel reactors. As a result, the briquettes are absorbed rapidly in the biogas reactor.
The largest briquette machine presses BP6510 and BP7510 hold the capacities of 1,5 and 2,75 tonnes per hour of briquetted straw, respectively. The briquette machine presses are piston and flywheel based presses, which operate with 270 revolutions per minute, creating pressure beyond 2000 kg/m2 and thus causing the small steam explosions which change the structure of the straw.
Due to the relatively high density of the briquettes, a substantial amount – approximately 10% - can be added to manure in a reactor. For example, a biogas plant, which uses 100.000 tonnes of slurry and produces 2.5 million m3, can produce approximately 6.5 million m3 of biogas. This is the result of the technology and feeding of 10.000 tonne of straw per year.
Loose straws have a bulk weight of 50-80 kg/m3, whereas straw briquettes have a bulk weight of 400-450 kg/m3. This makes it easier to transport in conveyor systems and introduce into the biogas reactor, either through a screw conveyor at the top of the reactor or by mixing the briquettes with slurry, and pumping the raw material into the biogas reactor.
Contact us to learn more about our briquetting solutions for biogas plants.
Together with our partner Kinetic Biofuel, we have developed a technology where we can use briquettes from straw in biogas or bioethanol plants.
Working with a partner, we have developed a technology where we can use briquettes from straw in a biogas plant.
Esben M. Vestergaard
Regional Sales Manager
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