In order to meet rigid customer specifications, a manufacturer of ultra-efficient drying ovens for the formed-fiber industry required low NOXburners for a recent project. The application required closely controlling air volumes both in and out of the dryer. The precise control of the required excess air from the low NO Xburners over their full operating range was a prime concern in the project as overall operating efficiencies were an important factor for the customer.
Eclipse was contacted with the project requirements. The Winnox burner was proposed because of its ultra-low-NOXcapabilities. In order to fully comply with the project specifications, a ratio control circuit utilizing the Siemens LMV ratio controller was proposed as a way to minimize the excess air and still maintain the low NO Xqualities of the burner. The goal was to maintain 40% excess air throughout the firing range.
The Eclipse-designed gas trains included Siemens SKP 25 regulating actuators to insure constant gas pressure to the burner throughout the firing range. This insured consistent repeatable burner operation under all load conditions.