VISTA Combustor for Very Low NOx Emmisions in Furnaces and Boilers

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Title VISTA Combustor for Very Low NOx Emmisions in Furnaces and Boilers
Creator McClaine, Andrew; Becker, Fred; Litka, Anthony; Breault, Ronald; Shukla, Kailash; Jayakaran, Jaiwant D.; Poe, Roger; Strupp, Christoph
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1999
Spatial Coverage presented at San Francisco, California
Abstract The objective of this development program is to bring to the market an economically attractive ultra-low emissions combustor with NOx production of less than 9 ppmv and with CO emissions of less than 50 ppmv (both at 3% O2) while maintaining high efficiency and ease of operation and maintenance. The technology called the Vortex Inertial Staged Air (VIStA) combustor addresses both prompt and thermal NOx production in an air-staged combustor design. It reduces prompt NOx by partially reforming thoroughly pre-mixed natural gas fuel and air in the first stage of the combustor to CO and H2. By operating the first stage of the combustor at optimum conditions, natural gas can be reformed to species that will not contribute to the formation of prompt NOx. The inertial combustion system promotes stable combustion over a wide range of stoichiometry and firing rates and aids in the reformation of the fuel. The VIStA combustor reduces thermal NOx production by utilizing advanced aerodynamic principles to provide high internal flue gas recirculation in each of the combustion stages without resorting to conventional external flue gas recirculation (FGD) approaches. This translates into improved efficiency and reduced maintenance and operating expenses. Laboratory testing of three prototype VIStA combustors with nominal thermal inputs of 0.25, 3, and 6 MMBtu/hr has been conducted. The technical viability of the VIStA concept to achieve the desired NOx and CO emission levels has been evaluated in the 6 MMBtu/hr scale burner. As scale-up has progressed with each of these combustors, design modifications have been implemented with the aid of computational fluid dynamic (CFD) modeling using Fluent, a product of Fluent, Inc. Through this parallel effort, verification of the computational model with actual performance test data is providing the technology understanding necessary for future scale-up to 30-60 MMBtu/hr levels. Testing of the 6 MMBtu/hr VIStA combustor has been completed at Thermo Power Corporation. The unit was shipped to John Zink Company and tested independently by the John Zink development team members. This paper describes the results of the testing of the 6 MMBTU/hr VIStA combustor at both facilities and the modifications made to achieve the design goals.
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Format application/pdf
Language eng
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Setname uu_afrc
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