One of the challenges for biofuels manufacturing is reliably feeding low-density feedstocks into high-pressure reactors, because it is difficult to feed agricultural and forest residue, as well as municipal solid waste, into pressurized systems without bridging, compaction and flow instability. This “pressure gap” has required pre-processing steps to grind or pelletize the feedstock, which has limited the commercial scalability of biomass- and waste-to-energy processes. Now, Jenike & Johanson (Tyngsboro, Mass.; www.jenike.com) has been awarded a patent for a technology, known as Jen-Zero™, that is designed to solve this issue.
Biomass residue (source: Shutterstock)
At the core of the patented system is a diverging pressurization geometry, which contrasts with traditional converging designs that tend to compact material and restrict flow. The divergence allows material to discharge in a nearly free-fall manner, thereby promoting natural flow behavior without restricting material flow.
“This approach also enables effective handling of biomass ‘springback’ — a well-known phenomenon where compressed material may jam and form flow obstruction when the pressure applied on it is released,” Jenike & Johanson says.
The patented geometry mitigates this effect, resulting in a stable, continuous and pulse-free feed directly into high-pressure reactors, without the need for pelletizing or other costly pre-processing steps. The technology has been engineered for industrial-scale performance, with systems capable of handling up to 1,000 tons per day of biomass or MSW, while maintaining consistent reliability.
“This patent represents not just a novel concept, but a validated engineering solution built on decades of bulk-solids science,” said Jayant Khambekar, the lead inventor of Jen-Zero. “It provides the industry with a reliable pathway to overcome feeding limitations that have constrained progress toward sustainable energy systems,” Khambekar adds.