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Diesel-Fueled Cyclone External Combustion Engine Shows Near-Zero NOx

Emission testing performed by Cyclone Power Technologies on its Mark II pre-production prototype 18 hp (13 kW) external combustion engine running on diesel fuel showed near-zero emissions of NOx: 16.20 parts per million (.0016%). (Earlier post.)

Cyclone compared these results from dyanamometer testing to summary results for conventional internal combustion diesel engines, provided by Bridge Analzyers, the manufacturer of the testing device Cyclone used. Cyclone found that today’s diesel engines typically emit between 30 and 80 times more NOx than the Cyclone Engine running the same fuel.

Unlike conventional diesels, Cyclone Engines do not require any exhaust after-treatment. The Cyclone Engine burns its fuel at approximately 2,000 °F (1,093 °C), whereas NOx forms at temperatures above 2,300 °F (1,260 °C)—ranges typical for both diesel and gasoline-powered internal combustion engines. Nor does the Cyclone Engine idle; when no power is required from the engine, it shuts off.

While it is difficult to compare these results with current EPA standards, we believe that future mass emission testing of our engines will demonstrate that we can exceed even the most stringent environmental standards without the need for costly exhaust treatment equipment.

With minor adjustments to our Mark II 18HP generator engine over the following months, we believe that our emissions readings will improve further. The external combustion engine is naturally cleaner than internal combustion engines, and we expect the Cyclone to set the standard for this class.

—Frankie Fruge, Cyclone’s COO

The company performed the tests at its Pompano Beach, FL facility using a Bridge Model 9005-03 Gas Analyzer, which uses electro-chemical sensors to measure NOx.



This engine, the Brayton/Rankine engine
and others might make good range extender engines in hybrid cars. Once you have a series hybrid with range extender you can use the most effective prime mover to generate power.


In other words: It's about as good as a Diesel engine utilizing EGR.


what was the efficiency and cost of the engine? No exhaust treatment should reduce the cost a bit, depending on how much fuel it uses.

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