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Title: Testing Long-Wavelength Acoustic Flowmeter Concepts For Flue Gas Flows
Author: Lee J. Gorny, Keith A. Gillis, And Michael R. Moldover
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: As a part of NISTs program to standardize measurements of greenhouse gas emissions, we are developing a long-wavelength acoustic flowmeter (LWAF) for accurate, economical measurements of exhaust flows from coal-burning power plants. Measurements of the flue gas mass flow combined with the gass composition are used to determine the emitted CO2 and other by-products of combustion. Today, such measurements have uncertainties of 5 % or more due to the large size of the flue-gas stacks and the flows non-uniform, unsteady, and swirling profile. A LWAF averages the spatial non-uniformities of the axial velocity over the entire cross section in a manner insensitive to flow distortions. In contrast, conventional techniques measure gas flow only at isolated points or averaged along chords across the stack. We constructed a 1:100 scale, calibrated flow facility for the initial development of a LWAF.

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