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Cookin' with gas: UWO professor earns patent for flameless industrial oven

Cookin' with gas: UWO professor earns patent for flameless industrial oven
2023-04-01
(Press-News.org) Pawel Olszewski, a University of Wisconsin Oshkosh associate mechanical engineering technology professor, recently was granted a U.S. patent for his flameless impingement oven, designed and built in the Teaching and Energy Research Industrial Lab (TERIL) on the Oshkosh campus.

Olszewski began the patent process back in 2019 with WiSys, the Wisconsin-based nonprofit dedicated to helping inventors protect their intellectual property, and received the news of approval in February.

Titled “flameless impingement oven,” the invention is patent number US 11,585,601 B2, granted on Feb. 21.

Industrial ovens—like the ones this creation improves upon—are used for a variety of purposes, including heat treating and melting materials like steel or aluminum. The benefits of the flameless impingement setup, Olszewski said, include faster heating to increase productivity; fewer emitted pollutants because the thorough heating reduces nitrogen oxides; and a reduction in fuel consumption with gases exhausted at lower temperatures.

The new oven arranges natural gas and air jets to directly affect the object being heated, substantially transferring heat by impingement transfer rather than by conventional radiation and thermally induced convection.

Because the air and gas are swirling at such speeds inside the oven—“like a huge tornado,” Olszewski explained—the chemical reaction to produce extreme heat is occurring everywhere all the time.

The chamber, which is a foot tall, a foot wide and a food deep, reaches temperatures beyond 1,800 degrees Fahrenheit.

“Everything mixes and the gas is always meeting the oxidizer,” he said. “So when you look inside the furnace during the normal flameless operation, there are no flames. You have combustion but no flames. Natural gas oxidizes, it reacts with the oxygen, generates heat, but there is no flame.”

The prototype was built in the TERIL on the third floor of the Halsey Science Center. The oven is the fourth unique industrial system built there and requires the other three to run: chilling, pumping and compressed air.

The idea can be traced back to when Olszewski was a post-doctorate fellow at the University of Michigan. While there, he worked with simpler flameless ovens. The ideas continued to swirl around in his mind and when he came to UW Oshkosh in 2014 he and his students began to create all of the industrial systems that allowed for the oven to exist.

“There is no single piece of the equipment that was purchased in the state it’s in. Everything was purchased as a component,” he said. “We cut whatever the frames, we organized our own control cabinets, everything here including the software that controls all of the systems.”

What Olszewski is hoping for next is a local company to express interest so the idea can grow beyond the single prototype. He said any company that melts aluminum, cast iron, steel or even glass could make use of the technology. It can translate to more or less any size and ovens already in use could be retrofitted.

“I’m hoping it will catch somewhere,” he said.

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UW Oshkosh is home to 9,703 undergraduate, graduate and doctoral students on three campuses. With more than 250 majors, minors and certificate programs, UW Oshkosh offers one of the largest program arrays in Wisconsin. Student success is at the heart of UW Oshkosh. Students benefit from personalized support with small class sizes, a wealth of academic and personal support services, and personalized career and academic advising. Oshkosh is ranked as the No. 1 best college town and the No. 4 most livable small city in the United States, and students benefit from entertainment, employment and recreation of a thriving community. With a strong research focus and national ranking in sustainability, Titans demonstrate on a daily basis what students can do to change the world. Learn more at uwosh.edu.

 

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[Press-News.org] Cookin' with gas: UWO professor earns patent for flameless industrial oven