The company said the patents support its initiatives targeting the expansion of multiple fuels for operations, including high-flame speed fuels such as hydrogen, while maintaining Capstone’s industry-leading low emissions.
The first patent is for a multiple-fuel, pre-mixed, low-emission injector for high-flame speed fuel combustion. This patent lays the foundation for continued development to achieve high reliability and performance with hydrogen-content fuels, Capstone said in a statement.
The second patent is for a multi-staged, lean pre-vaporizing, pre-mixing fuel injector providing ultra-low emissions that meet the Environmental Protection Agency’s Tier 4 requirements for power generation. Under this new program, exhaust emissions from these engines will be required to decrease by more than 90%, the company said.
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“Both patents use a similar design architecture but with differences for each application. One being for liquid fuels, and the other for hydrogen and hydrogen blend fuels,” said Don Ayers, Capstone’s director of product engineering. “They each seek to control fuel to air mixing to achieve higher performance and combustion efficiencies through flame stability, flashback prevention, and ultra-low emissions.”
The patents are part of the company’s organic technology-growth strategy to develop new fuel capabilities and to integrate these advancements into Capstone’s future C65 Signature Series product line, according to the statement.
“Microturbines operating on alternative fuels like hydrogen, biogas, butane, and renewable natural gas showcases how Capstone’s innovative and adaptable microturbine technology can continue to grow into new segments of the expanding green energy economy,” said CEO Darren Jamison.
Capstone, based Van Nuys, California, offers a product lineup of microturbines that can produce anywhere from 30 kilowatts to 10 megawatts of power, operating on a variety of gaseous or liquid fuels. To date, Capstone has shipped over 9,000 units to 73 countries and have saved customers an estimated $253 million in annual energy costs and 350,000 tons of carbon.
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